Chem exam

Read the two questions.Question 1: Is change in atmospheric CO2 levels likely to impact marine life?Question 2: Should diesel and gasoline engines compliant with CO2 emission standards be banned?Use complete sentences to explain whether both questions can be answered by science or not. Be sure to explain why for each question.

1. Yes science can help answer whether co2 levels are likely to impact marine lie. You can figure out how much co2 is in the atmosphere and figure out if marine life can handle that amount. 2. No science cannot help answer this question because its a matter of opinion.

What volume is equivalent to 14,000 mm3?

1.4 x 10‒5 m3

Match the term to its description. a.Potential energy stored in the bonds between atoms b.The movement of an electrical charge c.Electromagnetic energy that travels in waves d.Internal energy caused by vibrations of atoms and molecules

1.Chemical energy (a.) 2.Radiant energy (c.) 3.Electrical energy (b.) 4.Thermal energy (d)

Ted used a balance scale to weigh a 2.233 g sample of copper sulfate. Which of these measurements made by Ted is the most accurate?

2.2 g

How many kilograms are in a 50-pound luggage bag?Use 1 pound = 0.45 kg

22.5 kg

25,000 cg is equal to_____g.

250

If a recipe calls for 0.800 kg of flour, how many ounces of flour does it need?(1 lb = 16 oz, 1 lb = 0.454 kg)

28.2 oz

Carbon is located in the fourth tall column of the periodic table. How many valence electrons does the element carbon have?

4

If an object has a density of 0.55 g/mL, what is its density in cg/L?

55,000 cg/L

Which of the following is an example of kinetic energy changing into potential energy?

A child on a swing slowing down as she swings upwards

An electron moved from shell n = 2 to shell n = 1. What most likely happened during the transition?

A photon of energy was released.

Which of the following observations indicates that an atom has neutrons?

A radiation with neutral particles is emitted when alpha particles strike beryllium atoms.

What best describes the bonding in a silicon dioxide molecule?

A silicon atom shares two electron pairs with each oxygen atom.

Which of the following shows examples of things that convert chemical energy to mechanical energy?

Airplane and human body

Describe the properties of alkali metals. Based on their electronic arrangement, explain whether they exist alone in nature.

Alkali metals are elements lithium, sodium, potassium, and cesium. They do not exist alone in nature. They have one electron in their outer shell.

What is the name of a compound having the formula Al2O3?

Aluminum oxide

What is the vertical distance between the center line of a wave and the crest called?

Amplitude

This Bible verse BEST illustrates which of the following concepts in chemistry? "Though one may be overpowered, two can defend themselves. A cord of three strands is not quickly broken. Ecclesiastes 4:12"

An ionic bond is made up of ions.

A student compares the boiling point of substances having different intermolecular forces. Which dependent variable did the student most likely use?

Boiling points of various substances

What is the formula unit for a compound made from Ca and O?

CaO because the total positive charge on Ca is two.

The gas carbon dioxide is a pure substance. Which of the following is true about carbon dioxide?

Carbon and oxygen are chemically bonded in it.

Which of the following provides evidence to support Thomson's hypothesis about electrons?

Cathode ray experiments

Which of the following types of energy does an object store in the bonds of atoms and molecules?

Chemical energy

Which of the following correctly compares the radii of Cl and Cl−?

Cl has a smaller radius than Cl− because Cl− has an expanded electron cloud.

What does a decrease in temperature indicate about the molecules in a sample of liquid water?

Decreased kinetic energy of the molecules

The following properties are either physical or chemical. Which one is different from the rest based on those two categories?

Density

Which phrase best describes the bond in O2?

Double covalent bond

What part of the scientific method involves drawing inferences about experimental results and determining if the collected data support the original hypothesis?

Drawing conclusions

A student wants to examine a substance without changing its identity. Which of the following properties of the substance should the student examine?

Ductility, because it can be observed by altering the shape of the substance

It is possible to have positive, strong, healthy relationships with others without prioritizing your relationship with God.

False

The amount of stored chemical energy is what determines the temperature of a substance.

False

The following properties are either physical or chemical. Which one is different from the rest based on those two categories?

Flammability

Which of the following is true concerning matter and energy in the universe?

God created all energy and matter when He created the universe.

Which of the following is a unit of mass in the metric system?

Gram

Which of the following best represents and explains the formula for a compound made from fluorine and hydrogen?

HF, because both fluorine and hydrogen are capable of forming only one covalent bond.

Which of the following groups of elements are likely to have elements in the three states of matter?

Halogens

The boiling point of bromine is 59 °C. Which of the following best predicts the boiling point of iodine monochloride, a polar compound?

Higher than 59 °C because dipole-dipole interactions in iodine monochloride are stronger than dispersion forces in bromine.

Which of the following cannot be tested by science?

How emotion affects the quality of a painting

Which question requires knowledge from both science and religion to answer?

How were the atoms that create all matter originally formed, and how are they are able to bond together to form compounds and molecules?

God exists everywhere in the universe and interacts with everything in the universe. Which element interacts with just about all atoms and is found everywhere in the universe?

Hydrogen

Which of the following are dipole-dipole interactions that occur only between molecules containing N-H, O-H or F-H bonds?

Hydrogen bonding

Which of the following properties decrease down a column in the periodic table?

Ionization energy

Define ionization energy.Describe how ionization energy impacts ionic bonding.

Ionization is the lowest amount of energy to remove loose electron of an atom or molecule. Ionization must form a cation by loosing one or more molecules.

Which of the following questions can be answered by science?

Is fruit ripening dependent on the type of light the fruit is exposed to?

Which of the following is a property of a pure substance?

It can be chemically separated if it is a compound.

Which of these statements best explains why chemistry is testable?

It can measure data by experiments.

Which of the following is true for a reliable scientific source?

It cites valid data.

Which of the following happens to a molecule of an object when the object is heated?

It gains kinetic energy.

Which of these statements best explains why chemistry is reliable?

It gives the same result when an experiment is repeated.

A substance is present in the gaseous state at room temperature. Which of the following best explains the probable position of the substance in the periodic table?

It is between groups 13 to 18 because it is a non-metal.

What best explains the type of energy present in natural gas?

It is chemical energy, which is a type of potential energy.

Which statement is not true about the field of science?

It is consistent and does not need to change with new discoveries.

Which of the following is a characteristic of robust scientific knowledge?

It is frequently re-examined.

What is generally true about the compressibility of solids?

It is lower than the compressibility of plasmas and gases.

Which of the following explains the VSEPR geometry of a water molecule?

It is tetrahedral because there are two bonded pairs and two lone pairs around oxygen.

Which of the following could result from a substance that undergoes a chemical change?

Its elemental composition is altered.

What phase of matter has particles that are held together but can flow past each other and takes the shape of a container, filling it from the bottom up?

Liquid

Which of the following is a unit of volume in the metric system?

Liter

The density of a gas is 1.25 grams/liter. Which of the following is correct to convert the density of the gas to ounce/milliliter? [1 gram = 0.04 ounce, 1 liter = 1,000 milliliter]

Multiply 1.25 by 0.04 and divide the result obtained by 1,000

Scientists have discovered marine fossils in rock layers all over the world. This discovery is supported by the story of _________ in the bible.

Noah's Ark

What is the charge on an atom after it loses an electron during the formation of a bond?

One positive charge

Which of the following is an example of using creativity while recording measurements during an experiment?

Organizing data in tables

What happens when the compound MgO is formed?

Oxygen receives two electrons from magnesium.

What term is used to describe a particle representing a quantum energy?

Photon

Janet observes that bubbles rise inside water when water is heated. Which of the following best names and explains the change that causes bubbles to rise?

Physical change, because heat only changes the attractions of the molecules

What type of energy does a rock resting on top of a hill have?

Potential energy

Define principal quantum number.

Quantum number is a number that occurs in the theoretical expression for a value of some quantized property in a subatomic particle, atom and molecule. It can only have certain values of integrity.

What are characteristics of reliable science?

Replicable results and empirical data

Carlos is trying to determine how music affects the growth of bean plants. He hypothesizes that classical music will cause a plant to grow at a higher rate than no music or rap music. He grows nine bean plants in similar lighting, temperature, and soil conditions. Three are exposed to classical music 24 hours a day, three are exposed to rap music 24 hours a day, and three are grown in complete silence. Carlos measures the growth of the plants every day and finds that the plants all seem to have the same rate of growth.What is missing from Carlos's scientific investigation?

Research on what other scientists have observed and investigated on this topic

Two friends at different locations want to communicate with each other by sending low energy signals. Which of the following methods can they use to communicate?

Send radio waves through intervening media like radio and television.

How can you strengthen your bonds with others?

Showing your support to a friend Volunteering at a soup kitchen with your family Praying with your family on a daily basis all of the above

Which of these is an example of a physical change?

Shredding of leaves in a machine

Which of the following is a physical property?

Solubility

A science student observes that a dissolvable antacid tablet acts faster in relieving stomach pain when taken with warm water than when taken with water at room temperature. Based on the observation, suggest a potential problem that can be studied. Also, list the dependent, independent, and controlled variables that can exist in such an investigation.

Some potential problems are is the person dissolving the tablet in the water first then drinking it or are they taking the tablet then drinking the warm water. Another potential problem is how fast is the stomach pain easing. The independent variable is the water temperature. The dependent variable is how fast the acid tablet is working. Controlled variables are the type of anti acid tablet taken.

The solar system moves at the speed of 828,000 km/h. Tara writes the following steps to calculate this speed in decameters/second (dm/s).[1 km = 100 dm]Step 1: Divide 828,000 by 100.Step 2: Divide the result obtained in step 1 by 60.Step 3: Divide the result obtained in step 2 by 60.Step 4: Write the number obtained in step 3 with the unit dm/s.Which step is incorrect in the conversion?

Step 1

What energy transfer is occurring when a battery-powered toy rolls across the floor?

Stored chemical energy is converted to mechanical energy.

A scientist hypothesizes that the temperature at which a turtle's egg is incubated determines the sex of the offspring (whether it will be male or female). What is the independent variable?

Temperature

Compare the type of change that occurs when an iron bar rusts and when a substance freezes. Use complete sentences to justify the type of change that occurs.

The Iron is forming a new substance the iron bar is going through a chemical change. When something freezes it is changing form a liquid to a solid. When a substance freezes is a physical change and is reversable.

The electron configuration of an element is shown below.1s22s22p63s23p6Name the group this element belongs to in the periodic table and explain your answer.Based on the electron configuration, write one chemical property of this element.

The element is Aragon because it has 18 total valence electrons. Aragon is in group 18 of noble gases.

What is potential energy?

The energy of position or composition

How does a sample of hydrogen at 10 °C compare to a sample of hydrogen at 350 K?

The hydrogen at 10 °C has slower-moving molecules than the sample at 350 K.

Which root word of the binary ionic compound ends with -ide?

The non-metal

Temperature is used to measure the movement of particles such as atoms and molecules. As temperature increases, what is always true of the particles in a substance?

The rate of movement increases.

Which of the following explains how Marie and Pierre Curie tried to influence the use of their discovery?

They supported the use of radioactive elements for medical diagnostic purposes.

Density is an intensive physical property because the density of a given substance does not change with the size of the sample.

True

If a question is testable and can provide an answer based on empirical observations and reasonable logic, it can be answered with science.

True

Noah followed God's instructions using standardized units of measurement to build the ark.

True

The meter is the SI unit for length.

True

The periodic table has 7 rows which symbolize the 7 days of creation.

True

Which of the following questions can be answered by science?

What is the composition of air?

Which of the following could be considered a scientific statement?

X‒rays have a lower frequency than microwaves.

In Genesis 2:1, God said that the work of Creation was _______.

finished

God uses ______ to separate us from our fears and anxieties.

the Holy Spirit