Physical Science Final Review

Deposition

10.

A ____ is a is an example of a homogeneous mixture.

14-karat gold necklace

Order the following from highest to lowest energy: radio, gamma, visible, microwave __1__radio waves__2__visible light__3__gamma rays__4__microwaves

3, 2, 4, 1

Which element is in Group 2A and Period 2?

Beryllium

Which element is a metalloid?

Boron

Which element is in Period 4 and Group 7A?

Bromine

Consider the reaction: CH4CO2(aq) + NaHCO3(s) --> CH3CO2Na(aq) + H2O(l) + CO2(g) Which statements are true? There may be more than one answer.

CO2 is a product in the reaction. CH4CO2 is a reactant.

What is the atomic number of oxygen?

Eight

What are the two types of pure substances?

Elements and compounds

Halogens are...

Fairly reactive and most are poisonous

Based on the video, during the first billion years of the earth's existence the earth's atmosphere contained carbon monoxide, iron, and silicon dioxide.

False

Fluorine is a ___.

Halogen

Ne is a nonmetal and a ___.

Nobel gas

Oxygen is a metal or nonmetal?

Nonmetal

Which Period does iron belong?

Period 4

Alkaline Earth Metals are...

Silvery-white metals

What element has the chemical symbol of S?

Sulfur

Nobel Gases are...

Unreactive gases at room temperature

Condensation

a change of state from a gas to a liquid

Vaporization

a change of state from a liquid to a gas

Freezing

a change of state from a liquid to a solid

Sublimation

a change of state from a solid to a gas

Melting

a change of state from solid to liquid

All matter can be classified as a...

a pure substance or a mixture

Deionization

addition of an electrons causes a change of state from plasma to a gas.

Lithium is an ___ (group name, singular term).

alkali metal

Group 1 elements are called __ __ (plural).

alkali metals

Magnesium is a __.

alkaline earth metal

Plasma

an extremely hot gas without electrons - the sun

Matter is...

anything that has mass and occupies space

What is the atomic mass of carbon?

atomic mass of 12.01 amu

What is the atomic mass of oxygen?

atomic mass of 16.00 amu

Matter is made up of tiny particles called___.

atoms

An element is...

contains one type of atom and it cannot be broken down by a chemical reaction.

Heterogeneous mixture is ...

does not have a uniform composition throughout

Nonmetals are...

dull brittle and poor conductors of electricity

A compound is a substance composed of two or more separate proteins.

false

A medical study published in 2019 found that the consumption of red meat has no correlation to people who die younger of cancer.

false

A molecule of sucrose has 11 carbon atoms, 6 hydrogen atoms and 22 oxygen atoms.

false

Alka Seltzer contains ethylene glycol.

false

All living organisms, plants and animals are mostly composed of carbon, hydrogen, oxygen, and iron.

false

Alpha-glucose form a strong complex structure called cellulose and is found in corn stalk or tree trunks.

false

Antifreeze contains sodium bicarbonate.

false

Antioxidant preservatives like citric acid and ascorbic acid cause oxidation in foods causing foods to produce an off-flavor or color.

false

Atoms (except H and He) are more stable when their outermost energy has 10 electrons.

false

Based on the video, 20% of the earth's composition is Mg, Si, O, and Fe.

false

Based on the video, there are 118 naturally occurring elements on earth.

false

Beta-glucose bonds in a straight line and forms amylose or starch similar to what is found in potatoes.

false

Brass contains copper and tin.

false

Brighter foods are perceived to have less nutrition and flavor.

false

Bronze contains copper and zinc.

false

C10H8 is the chemical formula for 1,4-dichlorobenzene which is found in moth balls.

false

C6H4Cl2 is the chemical formula for naphthalene.

false

CA is the chemical symbol for calcium. Question options:

false

CaO is the chemical formula for calcium carbonate.

false

Carrageenan is a short, simple monosaccharide.

false

Chalk is made up of calcium oxide.

false

Chemical bonds between atoms are formed primarily because of the reactions between protons and neutrons in an atom.

false

Chemistry can be defined as the study of energy and the changes that matter undergoes.

false

Chemistry is anything that has mass and takes up space.

false

Chlorophyll is the yellow pigment in leaves.

false

Coal is a type of sedimentary rock made from thick deposits of quartz.

false

Cold water is less dense than warm water, hence temperature do not affect the density of ocean water.

false

Consuming energy or food in excess does not lead to fat storage in cells.

false

Copper oxide is the main component of sand.

false

Crude oil and natural gas are formed mainly from dead fish like salmon.

false

Diamond and Chalk are made up of carbon.

false

Drano is safe for consumption.

false

During the Inflationary Epoch there was no matter and only energy.

false

Earth's inner core is made up of aluminum and carbon.

false

Electromagnetic radiation includes only four types of radiation gamma rays, x rays, ultraviolet waves, and visible light waves.

false

Energy is the "stuff" of which all things are made.

false

Fiber is a fat molecule that helps maintain healthy digestion.

false

GMOs can decrease a crop's resistance to disease and make it less tolerant to herbicides.

false

Gamma waves can measure longer than a mountain range.

false

Green chemistry is also known as nonsustainable chemistry.

false

Green chemistry, also called unsustainable chemistry, is an area of chemistry focused on the design of products and processes that maximizes the use and generation of hazardous substances.

false

In theory, the earth's oceans were formed from the condensation of carbon dioxide in the earth's atmosphere.

false

Inorganic matter is composed elements like oxygen, silicon, aluminum, sulfur, magnesium, phosphorus, and potassium.

false

Jovian planets include Mercury, Venus, Earth, and Mars.

false

Jupiter has a region made up of liquid metallic iron and gold.

false

Jupiter has an atmosphere made up mainly of hydrogen and oxygen.

false

Jupiter has clouds of frozen methane whipped across the planet.

false

Kinetic energy is energy stored for use at a later time.

false

Living things do not grow well in acidic conditions.

false

Magnesium is an essential component of protein and the basis of muscles in animals.

false

Many hormones like insulin are made of sugars.

false

Marine chemistry is the repeated measurement of physical, chemical and biological variables in order to study environmental changes, particularly those arising from human activities.

false

Mars has an ice mantle made up of water, ammonia ice and methane sometimes referred to as a water ammonia ocean.

false

Mars is a gas giant.

false

Mars's thick crust consists of volcanic ash and green dust.

false

Mg is the chemical symbol for mercury.

false

Monounsaturated fats are precursors for hormone like molecules called prostaglandins.

false

Most compounds such as salts, sugars, acids, bases, and other organic molecules can NOT be dissolved in water.

false

Most of the iron on earth is located in the earth's mantle.

false

Most saturated fats are good for you, while unsaturated fats are bad for you in excess.

false

N is the chemical symbol for sodium.

false

Non-renewable energy sources come from natural resources such as sunlight, wind, rain, tides, and geothermal heat, which are renewable or naturally replenished.

false

Nutrasweet is also called calcium.

false

Olive oil is about 50 percent fat.

false

On food labels in the U.S., 1 calorie is equal to 1000 Cal, which is equal to 1000 kcal.

false

Oxidation is a physical change in the food that helps maintain color and flavor.

false

Oxygen has the chemical symbol of OX.

false

Pewter is made up of tin, copper, aluminum and lead.

false

Pollution of ocean water is not a major problem because most toxic substances do not mix easily with water.

false

Processing meat typically decreases its shelf life and quality of its flavor.

false

Quartz is made up of Silicon and hydrogen.

false

Rain is naturally slightly basic with a pH of around 8.

false

Sani-flush contains calcium bisulphate.

false

Saturn has lakes of liquid water.

false

Scientists believe that the earth's core consists primarily of oxygen and aluminum alloys.

false

Scientists do not believe that the burning of fossil fuels contribute to global warming.

false

Silver has the chemical symbol of AG.

false

Simple sugars are also known as polysaccharides.

false

Soda has a low glycemic index.

false

Sodium metal is a very stable and nonreactive element.

false

Sucrose is found in honey, fruits, and root vegetables.

false

Sugar alcohols are not naturally occurring, contain more calories than sugars, and are cariogenic.

false

The Periodic Table is a table of all of the known molecules.

false

The calorie counts on nutrition labels measure how much water the food contains.

false

The chemical Symbol for lead is Pd.

false

The chemical formula for Citric Acid is C7H5NaO2 which is a weak organic acid and occurs naturally in citrus fruits.

false

The chemical formula for Sorbic Acid is C2HO which is the most used preservative in the world.

false

The chemical formula for acetylsalicylic acid is C2H6O. Question options:

false

The chemical formula for ethanol is C9H8O4.

false

The chemical formula for sodium stearoyl lactylate is C3H7NO2S which is an emulsifier that gives the dough a springier texture.

false

The chemical symbol for iron is F.

false

The combustion of metals and alloys in the presence of hydrogen gas leads to the formation of sulfur dioxide.

false

The element that makes up most of the earth's composition is silicon.

false

The inner core of earth is made up of sulfur and aluminum.

false

The main elements in the earth's crust are Al, Kr, Co, Mn, F, S, and Ag.

false

The main ingredient of Rolaids is Ca(OH)2.

false

The most common element in the earth's crust is iron.

false

The ocean's chemical composition is mainly O, Si, Li, Mg, S, and Ca.

false

The reactions between nitrogen oxides and volatile organic compounds in the air can lead to the formation of alkaline rain.

false

The solar system came into being about 14.5 million years ago.

false

The sun is approximately 91% helium, 89% oxygen and 0.1% heavier elements such as carbon and nitrogen.

false

The terrestrial planets include gas giants such as Jupiter and Saturn and ice giants Uranus and Neptune.

false

The use of renewable forms of energy is decreasing in the U.S.

false

The valence electrons of an atom are not involved in chemical reactions.

false

Trans-fats are found in mainly hydrogenated oil products such as olive oil.

false

Trans-fats never occur in nature.

false

Venus is a gas giant.

false

Vitamins and Carbohydrates are inorganic compounds found in all food products in various amounts.

false

When plants die they eventually form coal and oil over millions of years, but sulfur atoms remain bonded to the hydrogen atoms.

false

Wind is a NOT form of energy.

false

Windex contains potash.

false

Solids

have a definite shape and volume

Gases

have no definite shape and no definite volume-take the shape of their containers.

Liquids

have no definite shape-have a definite volume and take the shape of their containers

A Granite countertop would represent a homo or heterogeneous mixture?

heterogeneous mixture

Ketchup would be a homo or heterogeneous mixture?

homogeneous

What are the two types of mixtures?

homogenous and heterogeneous

A pure substance is...

made up of all the same types of atoms molecules or formula units

A mixture is ...

matter made up of more than one pure substance

Pancake syrup would be a pure substance or mixture?

mixture

The center of an atom is called the ___.

nucleus

Metalloids have...

properties of both metal and nonmetals

Atoms are made up of...

protons neutrons and electrons

Would sugar (sucrose) be a pure substance/compound or pure substance/element?

pure substance and a compound

Would carbon be a pure substance/compound or pure substance/element?

pure substance and an element

Ionization

removal of electrons causes a change of state from a gas to plasma.

Metals are...

shiny ductile conductors of electricity

An ionic bond is best described as

the transfer of electrons from one atom to another.

Chromium is a ___.

transitional metal

A calorie is a unit of measurement often used to express the potential "energy" contained food.

true

A chemical bond is an attractive force between atoms that holds them together to make compounds or molecules.

true

A fat molecule is composed of glycerol head and three fatty acid tails, each of which is long hydrocarbon chain.

true

A few trace minerals needed by the body are Fe, Zin, I, Se, Cu, F, Cr, and Mo.

true

A hydrocarbon chain is a carbon skeleton bound to hydrogen atoms.

true

A valence shell is considered full and stable when the valence shell has 8 electrons.

true

ALMA is so sensitive that it can detect traces of molecules in clouds that are over 1000 lightyears away.

true

Acid rain can be 1000 times more acidic than natural rainwater.

true

All matter is made up of elements.

true

Ammonia is made up of only 2 elements, nitrogen and hydrogen.

true

An atom's outermost energy level of electrons is called the valence shell.

true

Arachidonic acid if found in animal sources like meat, fish, and eggs.

true

Around 90 percent of Jupiter's atmosphere is hydrogen the remaining 10 percent is made up of helium with tiny traces of other gases.

true

Aspartame is a well-known sugar substitute.

true

Astrochemistry is the study of the composition and reactions of atoms, molecules and ions in space.

true

Atmospheric chemistry is the study of the components of planetary atmospheres, particularly that of the Earth.

true

Based on the video, 99% of the earth's mass is from the mass of only eight elements which are Al, Ca, S, Ni, Mg, Si, O, and Fe.

true

Based on the video, during the first billion years of the earth's existence the earth's atmosphere was mainly carbon dioxide.

true

Based on the video, the earth can be divided into 3 layers called the crust, mantle and the core.

true

Because GMOs have a prolonged shelf life, it is easier to transport them greater distances.

true

Benzoic acid, sorbic acid, and propionic acid are synthetic preservatives found in foods like salad dressing, cheese, and baked goods.

true

Bleach contains sodium hypochlorite.

true

By studying the different molecules and their different abundances and temperatures scientists can learn more about the chemistry of space

true

C12H22O11 is the chemical formula for sucrose.

true

C2H4O2 is the chemical formula for acetic acid which is the main ingredient of vinegar.

true

C3H7NO2S is the chemical formula for L-Cysteine.

true

C6H8O6 is the chemical formula for ascorbic acid which is the chemical name for vitamin C.

true

CaO is also called quicklime.

true

Calcium Disodium EDTA is used as a medicine to treat lead and plutonium poisoning.

true

Calcium Oxide is most commonly referred to as quicklime.

true

Carbohydrates are our body's main source of energy.

true

Carbohydrates can be simple or complex depending on their chemical structure.

true

Cellulose is a dietary plant fiber.

true

Chemical fertilizers are much more soluble in water than organic manure-based fertilizers.

true

Chemical fertilizers can contribute to the destruction of a lake's ecosystem.

true

Chromium has the chemical symbol of Cr.

true

Citric acid and other acids are often added to canned foods.

true

Cu is the chemical symbol for copper.

true

Diets rich in trans-fats increase the bad cholesterol LDL and reduce the good cholesterol HDL

true

Drano contains NaOH.

true

During the Inflationary Epoch the universe began to rapidly expand.

true

EPA and DHA are marine sources of omega-3s.

true

Earth is divided into 3 layers of different chemical compositions

true

Earth is divided into 3 layers of different chemical compositions.

true

Earth is the largest of the terrestrial planets.

true

Easy-off contains NaOH.

true

Eggs, cheese, and meat have a low glycemic index.

true

Eggshells are made up of calcium carbonate.

true

Elderly people have a relatively slow metabolic rate.

true

Electromagnetic waves are produced by the vibration of charged particles and have electrical and magnetic properties.

true

Electromagnetic waves have crest and troughs just like ocean waves

true

Electromagnetic waves travel through space at the constant speed of light.

true

Elements are the building blocks for everything and the smallest bit of an element is an atom.

true

Energy is defined as the ability to do work or the ability to move an object across a distance.

true

Enzymes are molecules that speed up reactions between two compounds or substrates.

true

Enzymes in our digestive system are able two break down proteins into amino acids which are small enough to pass through our digestive system.

true

Epsom salt is MgSO4.

true

Erythritol is about half as sweet as sucrose, and it has significantly fewer calories than sorbitol and xylitol.

true

Every molecule has a unique fingerprint that scientists use to identify them.

true

Fats are also a major source of energy, a critical component of cells and tissues, and they also help absorb essential vitamins.

true

Fats are an essential part of a healthy diet.

true

Fats are an essential part of diet and health.

true

Fats have a three-carbon backbone called glycerol.

true

Fatty acids can be short or long.

true

Fatty acids with only single bonds are called saturated.

true

Feldspars are a group of minerals formed from Si, O, Ca, Na, Al, and K.

true

Food is made of carbohydrates, proteins, and fats.

true

For the most part, particulate matter, ozone, nitrogen oxides and sulfur dioxide are pollutants exists as a direct result of human activity.

true

Fossil fuels are mainly composed of carbon with varying amounts of hydrogen.

true

Fossil fuels contain tiny amounts of sulfur.

true

Fossil fuels like oil coal and natural gas are the remains of living things from millions of years ago.

true

GMOs could affect people's ability to defend against illness.

true

Gas giants like Jupiter are primarily made up of helium and hydrogen while ice giants like Neptune also contain rock, ice and a liquid mixture of water, methane and ammonia.

true

Genetically Modified Food, often classified as GMO's are foods whose DNA has been modified.

true

Geochemistry is the study of the chemical composition of the Earth and other planets, and the chemical processes that affect them.

true

Geothermal energy is A form of energy harnessed from the earth's natural heat (natural steam geysers) and used to generate electricity.

true

Glucose, fructose, and galactose are all simple sugars.

true

Gold has the chemical symbol of Au. Question options:

true

Green chemistry reduces the negative impacts of chemical products and processes on human health and the environment.

true

H and He are stable with 2 electrons in the valence shell.

true

Heterocyclic amines (HCAs) are unhealthy compounds produced in meat as it cooks.

true

In 2019, over 40% of the sources of U.S. energy consumption was from BioMass.

true

In photosynthesis, plants absorb carbon dioxide and water from the atmosphere and produce glucose and oxygen.

true

In the Hadron Epoch the universe cooled down enough for quarks to bind together and form protons and neutrons.

true

In the presence of sunlight, a photochemical reaction between sulfur dioxide oxygen forms sulfur trioxide which dissolves in rainwater to form sulfuric acid.

true

In theory, sedimentary rock, oil, and gas were formed from dead algae and plants that became compressed in layers of sediment over millions of years ago.

true

In theory, the chemical composition of the earth's atmosphere during the first billion years was similar to that of Venus and Mars

true

In theory, the process of photosynthesis carried out by algae and green plants some 2.7 billion years ago caused the atmospheric levels of carbon dioxide to decrease and oxygen to levels increase.

true

Jupiter has a very strong magnetic field

true

Jupiter is the largest planet in the solar system.

true

K is the chemical symbol for potassium.

true

LDL cholesterol has damaging effects on blood vessels.

true

Lactose, maltose, and sucrose are disaccharides.

true

Lead would melt on the surface of Venus because it's the hottest planet in the solar system.

true

Less than 1% of the earth's atmosphere contains gases like CO2, Ar He, Ne, Xe, and Kr.

true

Limestone is a sedimentary rock mostly made up of calcium carbonate that marine organisms incorporate into their shells and skeletons.

true

MSG stands for monosodium glutamate which has the chemical formula of C5H8NNaO4.

true

Magnesium and Nitrogen help make up the structure of a chlorophyll molecule, a critical substance that plant use to absorb light energy.

true

Marble is made up of calcium carbonate.

true

Marine chemistry is the study of the chemical composition and chemical processes of the world's oceans.

true

Mars core is made up of mostly iron, nickel and sulfur.

true

Meat is a great source of B vitamins, minerals, iron, and zinc.

true

Mercury is the closest planet to the sun.

true

Mercury is too small to hold onto its atmosphere which is made up of hydrogen and helium.

true

Most amino acids have a central carbon atom bonded to one amino or nitrogen-containing group and one carboxylic acid group.

true

N-Nitroso compounds are carcinogenic.

true

NaCl is the chemical formula for table salt.

true

NaClO is the chemical formula for sodium hypochlorite.

true

NaOH is sodium hydroxide.

true

Neptune's atmosphere is made up of mostly of hydrogen, helium, and methane.

true

Nine out of 21 amino acids are considered essential because the body cannot produce them.

true

Nitrates and nitrites are added to cured meats to ward off bacteria that cause botulism, but they may cause health problems.

true

Nitric acid arises from the exhaust pipes of our motor vehicles.

true

Nitrogen dioxide emissions come from cars and factories where fuels are combusted.

true

Non-renewable energy sources comes from natural resources that cannot be produced, grown, or generated as fast as they are consumed

true

Not all fats cause heart disease and are bad.

true

On food labels in the U.S., 1 Calorie is equal to 1 kcal.

true

One advantage of GMOs is being able to grow plants in more areas that were previously unsuitable for farming.

true

One human activity that contributes to pollution is the burning of fossil fuels.

true

One of the main advantages of GM technology is that crops can be engineered to withstand weather extremes.

true

Outcrossing refers to the risk of GMO genes mixing with those of conventional crops.

true

Over half of the ocean's composition is chlorine followed by sodium.

true

Oxygen in the earth's crust is bound to other compounds to form solids.

true

Ozone in the upper atmosphere absorbs harmful UV rays from the Sun but ground level ozone can be problematic.

true

Particulate matter is a mixture of sulfates, nitrates, ammonia, sodium chloride, carbon, mineral dust, and water.

true

Planets are classified as terrestrial and jovian based on their composition.

true

Pollution remediation is the removal of pollutants, including chemical substances and/or energy, that are judged to be having a negative impact on the environment.

true

Potassium Sorbate can cause some skin allergies when used in personal care products.

true

Protein is found in eggs, dairy, seafood, legumes, meat, nuts, and seeds.

true

Proteins are long-chain molecules made of strings of amino acids joined together

true

Proteins are used in the body for hair, nails, muscles, and skin.

true

Rain is naturally slightly acidic because it can dissolve carbon dioxide from the atmosphere to form carbonic acid.

true

Red Dye Number 40 is made from petroleum.

true

Red meat was added to the WHO's list of foods that probably causes cancer.

true

Rice can be genetically modified to produce high levels of Vitamin A.

true

Salts comprise about 3.5% of the mass of ocean water.

true

Saturn is a gas giant

true

Saturn is mostly composed of hydrogen and helium with some traces of methane ammonia and water.

true

Saturn is the least dense planet in our solar system.

true

Scientists believe that the first chemical element in the universe was helium.

true

Scientists believe that the sun will eventually run out of hydrogen fuel and collapse into a white dwarf.

true

Scientists routinely find molecules in space.

true

Silicon and oxygen can react and form the mineral quartz.

true

Smog and ground ozone can cause breathing problems, trigger asthma attacks, and lead to lung disease.

true

Sodium hydroxide, commonly used in cleaning supplies, can cause burns on the skin and damage to the lungs if inhaled.

true

Sodium tetraborate decahydrate is the chemical name for Borax.

true

Some additives are completely synthetic while others occur naturally.

true

Some chemicals formed in meat as it cooks have been linked to colorectal cancer.

true

Some fatty acids have only single bonds and others have both single and double bounds.

true

Stabilizers are compounds that chemically imitate fats, carbohydrates, or proteins to create a homogeneous mixture of ingredients that otherwise wouldn't stay mixed.

true

Stevia is a plant-based compound often used as a sweetener.

true

Sucralose is also known as Splenda.

true

Sugar is a carbohydrate.

true

Sugar is the body's preferred source of energy.

true

Teflon is made up of tetrafluoroethylene.

true

The 2 main types of chemical bonds are covalent and ionic bonds.

true

The Earth's atmosphere is approximately 78% nitrogen and 21% oxygen.

true

The Law of Conservation of Energy states that energy cannot be created or destroyed.

true

The Sun can be divided into 6 layers the corona, the chromosphere, photosphere, the convective zone, radiative zone, and the core.

true

The average man needs about 2,500 calories each day.

true

The body produces ammonia when it metabolizes protein

true

The burning of fossil fuels can contribute to the acidification of rain.

true

The burning of fossil fuels causes much stronger acids to dissolve in rain forming acid rain with a pH as low as 3.

true

The chemical formula for Aspartame is C14H18N2O5.

true

The chemical formula for Sodium Benzoate is C7H5NaO2 which inhibits the growth of microorganisms.

true

The chemical formula for ammonia is NH3. Question options:

true

The chemical formula for boric acid is H3BO3.

true

The chemical formula for calcium hydroxide is Ca(OH)2.

true

The chemical formula for formaldehyde is CH2O.

true

The chemical formula for one of the active ingredients in Milk of Magnesia is Mg(OH)2.

true

The chemical formula for phosphoric acid is H3PO4 which is used as an acidifier and a preservative that inhibits mold growth.

true

The chemical name for NaHCO3 is sodium bicarbonate.

true

The composition of the Earth's atmosphere today is about 79 to 80% nitrogen, 20% oxygen, and other gases making up less than 1%

true

The density of seawater is greater than that of fresh water because it has so many dissolved substances in it.

true

The earth's atmosphere today is made up of less than 1% carbon dioxide.

true

The earth's crust is mostly made up of oxygen, silicon, aluminum, iron, and other minerals.

true

The main active ingredient in Tums is calcium carbonate which has the chemical formula of CaCO3.

true

The mantle of Uranus is icy.

true

The number of calories you need to maintain your weight depends on age, weight, height,activity level, and gender.

true

The octet rule states that atoms will gain, lose, or share valence electrons in a way that will give each atom eight electrons (except the first energy level) in their valence shell.

true

The planet Saturn contains liquified and metallic hydrogen.

true

The sun is made up of mostly hydrogen and helium.

true

The sun's energy is called electromagnetic radiation.

true

The use of renewable forms of energy is increasing in the U.S.

true

There are 8 planets revolving around the sun.

true

There are two types of glucose molecules called alpha-glucose and beta-glucose

true

There is evidence that water once existed on Mars.

true

Two or more elements combined is called a compound.

true

Unsaturated fats have one or more double bonds.

true

Uranus is composed of more ice than gas.

true

Uranus's atmosphere is mostly hydrogen and helium and its blue-green color from the absorption of red light by the methane gas.

true

Venus has an iron core.

true

Venus is the hottest planet

true

Vinegar contains a chemical called acetic acid.

true

Vitamin C is made up of carbon, hydrogen and oxygen.

true

Vitamins are known to prevent diseases when present in adequate amounts.

true

Vitamins can be divided into two groups, namely fat or water-soluble

true

Water has oftentimes been referred to as the "universal solvent" because many things can dissolve in water.

true

When coal is burned, the sulfur and the carbon atoms join with atmospheric oxygen to form carbon dioxide and sulfur dioxide in the atmosphere.

true

When water is denser, it sinks down to the bottom; therefore, surface waters are usually lower in density and less saline.

true

When we eat protein it gets broken down into its individual amino acids.

true

Work is defined as the ability to use a force to move an object across a distance.

true

Xylitol is like sucrose in its sweetness.

true

Homogeneous mixture is...

uniform composition throughout

Transition elements are...

very hard with high melting & boiling points-high electrical conductivity

Alkali Metals are...

very reactive