Chemistry Final

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A change of state is a physical change because...!

...

Which of the following is not a physical change?!

...

How many double bonds does a molecule of carbon dioxide have?

1

In this molecule, the two carbon atoms share...

1 electron

The atomic number of hydrogen is1. The nucleus of the isotope hydrogen-2 contains

1 proton and 1 neutron

The atomic number of sodium is 11. The nucleus of every sodium atom contains...

11 protons

The most reactive nonmetals are locate in Group...

17

New substances proceeded in a chemical reaction are called?

Products

Which organic molecules does your body use to build and repair body parts and to regulate cell activities?

Proteins

Which particles in an atom account for nearly all atoms mass?

Protons and neutrons

A student is identifying an unknown substance based on its properties. The student has found that the substance can conduct electric current only at high temperatures, not at low periodic table is the probable location of the element making up this substance?

along the zigzag line

The building blocks of proteins are...

amino acids

An alcohol is a substituted hydrocarbon that contains one or more

amino groups

Several campers sitting around a campfire discuss the chemical reaction that occurs when wood burns. They know that this reaction is...

an exothermic reaction

In liquid water, the water molecules...

are packed close together but are able to collide with and move past one another.

An element located in Group 16 of the periodic table is either a ...

nonmetal or a semimetal

The building blocks of nucleic acids are

nucleotides

isotopes of the same element differ by each other by their

number of neutrons

Carbon-12,carbon-13,and,carbon-14 are three isotopes of carbon. The atoms of theses isotopes have...

the same atomic number

The melting point of a substance is the temperature at which...

the substance changes from a solid to liquid

According to the principle of the conservation of matter, in any chemical reaction...

the total number atoms stays the same

Metals are good electrical conductors because...

the valence electrons are free to move from atom to atom

Where in the periodic table are metals found?

to the left of the zig zag line and in the two rows below the main table

Which of the following locations in the periodic table would have the least massive atom?

top left

The parts of a mixture can be separated by...

using the physical properties of its parts

Elements within the same group or family tend to have similar chemical properties because these elements have the same number of...

valence electrons

An exothermic reaction requires activation energy to ...

get the reaction started

2K+₋H₂O→2KOH+H₂ This chemical equation represents the chemical reaction between potassium and water. Which coefficient for water (H₂O) will correctly balance the equation?

2

How many atoms of oxygen are in a molecule of CO₂

2

₋Cu₂O+₋C→₋Cu+₋CO₂ Which set of coefficients placed in the blanks above will balance the chemical equation.

2,1,4,1

What is the atomic number of copper?

29

In which chemical equation below are both oxygen (O₂) and hydrogen (H₂) reactants?

2H₂+O₂→2H₂O

How many protons does an atom of krypton have?

36

How many electrons does a carbon atom have available to form chemical bonds?

4

A student in using a pH meter to find the pH of an unknown substance. If this substance is neutral, it pH will most likely be...

7

Which is the atomic mass of krypton?

83.80

#7 pg. 104

ANSWER:D

What is the chemical symbol for silver?

Ag

Give a description that describes an atom..

An atom is mostly empty space, with a tiny, dense nucleus.

Which chemical symbols best identifies the elements that make up the molecules in living organisms.

C,H,N,O,P,S

Carbon based molecules have a wide range of chemical properties because they...

Can form many different shapes.

Which change in state involves a decrease in a molecular motion

Condensation

The atoms in a molecule of water are joined by..

Covalent bonds

What is the chemical equation is a balanced equation for the burning of butane (C₄H₈)?

C₄H₈+6O₂→4CO₂+4H₂O

Which statement best describes the molecule shown in the diagram?

Each hydrogen atom shares one pair of electrons with the nitrogen atom.

Which particles of an atom move around the nucleus, forming a cloud like region of negative charge?

Electrons

When new chemical bonds form...

Energy released

In which state of matter do atoms and molecules have the most freedom of motion?

Gas

In which state of matter do the particles of the substance have the most energy?

Gas

Which group in the periodic table does the element calcium belong to ?

Group 2

Most of the elements in the periodic table are...

Metals

Which chemical formula does not represent an organic compound...

NH₃

What do atoms of the reactant rearrange to form?

New Molecules

The three particles that make up an atom are...

Protons,Neutrons,and Electrons

What happened if the substance gained enough energy so that it melted completely?

The particles would spread out into a layer that fills the bottom of the container

A student mixes together water and salt in a beaker until the salt completely dissolves , then sets the beaker aside after several days, the student return to see only a white solid in the beaker.What describes the scenario best?

The water evaporated from the solution, leaving the salt behind.

How does a container with gas inside look?

They move quickly occasionally bumping into each other.

The diagrams represent matter in three different states. The particles in State A (solid molecules)?

They vibrate in there position.

Which organic compound contains one or more hydroxyl groups?

Unsaturated hydrocarbon

IN which process do the particles in a liquid gain enough energy to move independently, forming a gas?

Vaporization

Why do living organisms need water to survive?

Water serves as a helper molecule in a variety of chemical reactions.

The diagram represents...

a molecule with two covalent bonds.

Two atoms with different atomic numbers are...

atoms of different elements

Carbon-14 is a radioactive isotope. When a carbon-14 atom decays, a neutron inside the nucleus, while the high energy electron is released from the nucleus. as a result of this process, the carbon-14 atom...

becomes an isotope a different element

In general, solids nonmetals are...

brittle and dull

Which of the following properties is not a property of metals?

brittleness

An organic compounds is a compound that contains the element..

calcium

The reactants of a chemical reaction have

chemical properties different from products

In a liquid the particles...

collide with and move past one another

A substance made of two or more elements chemically combined in a set ratio is a...

compound

An ionic compound forms a solid with an orderly, three-dimensional pattern called a...

crystal

You are given a sample of an unknown metal. Which property would best help you to identify the metal

density

What kind of molecule is it if it is repeated over and over?

diatomic molecule

What kind of bond between the two carbon atoms does this structural formula show?

double

The change in state form a liquid a gas required energy because...

energy causes the particles of a liquid to move faster and faster until the substance becomes a gas

Burning wood is an exothermic reaction because...

energy is released

A student has measured the mass of a sample of baking soda and a sample of vinegar before mixing them together. After mixing the two samples together, the student should find that the mass of the products is...

equal to combined mass of the baking soda and vinegar.

Which is not a characteristic of a molecular compound ?

hard brittle solids at room temperature

A solid substance is one that...

has a definite volume

The atoms of substances that are good electrical conductors \...

have freely moving electrons

Thermal conductivity refers to the ability of substance to conduct...

heat

What has the highest concentration of hydrogen ions (H⁺)

hydrochloric acid (pH value is 0)

When an acid is mixed with water...

hydrogen ions form

When water boils, it changes form a liquid gas. During this change the ,molecular motion of the water molecules...

increases

Which of the following best describes the elements located in the far right group of the periodic table

inert gases

Which typeof chemical bond forms as a result of the attraction between positive and negative ions?

ionic bond

the diagram illustrates the structure of a solid...

ionic compound

Which substance form so;ids by building up repeating patterns of oppositely charged ions?

ionic compounds

In a chemical reaction, the number of a reactant number...

is equal to the number of product atoms.

Compared to metals, solid nonmetals tend to be

less dense

Which state of matter has definite volume but no shape of its own...

liquid

What process changes between particles liquid to gas?

melting

The distance between particles in a gas is...

much greater than the distance between particles in a liquid

Which of the following is a characteristic of a base?

pH higher than 7

A large molecule made of a chain of many smaller molecules bonded together is called...

polymer

Which elements combine to form the compound represented by the formula KCI?

potassium and chlorine

The diagram represents an organic molecules that determines the difference among living organisms. The molecule is a...

protein

The chemical equation shows how ethene (C₂H₄) combines with oxygen (O₂) to form carbon dioxide (CO₂) and water (H₂O) . The equation represents a chemical change because the...

reactant atoms rearranged to form different combinations in the products

According to principle of the conservation of matter...

reactants have the same mass as the products.

Which evidence that a chemical reaction might have occurred?

release of energy

Ionic compounds form solids by building up...

repeating patterns of ions

Elements that have some properties of metals but also some properties of nonmetals are classified as...

semimetals

Carbon atoms form covalent bonds with each other atoms. In a covalent bond, electrons are...

shared

In which state of matter do the particles of a substance vibrate vibrate while being closely locked in position?

solid

Which of the following is an example of a complex carbohydrate

starch

An atoms valence electrons are those electrons...

that have the highest energy level

An ionic bond is...

the chemical bond formed by the attraction between positive and negative ions.

The melting temperature and hardness of an element are related to...

the forces that hold the atoms together

A student mixes together iron filings and sand, then removes the iron filings form the mixture with a magnet. Making a mixture is a physical change because...

the original parts of the mixture can be separated without being changed.

When does a graph represent an exothermic reaction?

the product has less energy than the reactants

In an endothermic reaction...

the products have more energy than the reactants


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