what is the definition of chemical change?

any change that results in the formation of new chemical substances.

matter cannot be created or destroyed, only change form

changes affecting the form of a chemical substance, but not its chemical composition.

Which of the following best describes how chemical changes differ from physical changes? (SC.8.P.9.2)

Physical changes produce no new substances and chemical changes do.

Physical changes always involve the formation of a gas while chemical changes may not.

Physical changes can occur inside or outside the substance; chemical changes always occur outside.

Physical changes involve a change of state; chemical changes involve a change of shape.

Joey is performing an experiment in science class. He mixes two liquids in a test tube, and gas bubbles appear at the surface of the test tube. What type of changes are most likely taking place? How do you know? (SC.8.P.9.2)

Chemical change because a gas formed.

Physical change because you can separate the mixture

Physical change because it still is a liquid

Chemical change because he used chemicals

A physical change does not involve a change in the substance’s chemical identity. Which of these statements describes a physical change? (SC.8.P.9.2)

Aluminum cans get crushed before recycling

A banana starts to smell as it ripens

Copper turns green when exposed to air

Onions taste sweeter after being cooked

How can the law of conservation of mass apply to a burning log, if all that remains of it is ash? (SC.8.P.9.1)

The masses of the gases and water vapor released into the air by the reaction, plus the ash, equal the mass of the log before burning.

The ash has the same mass as the log, although a large percentage of it blows away

The law of conservation of mass applies to changes of state but not to chemical reactions

The law of conservation of mass applies to substitution and displacement reactions but not to combustion reactions.

How does the chemical equation (below) for photosynthesis shown below demonstrate the law of conservation of mass? (SC.8.P.9.1) 6 CO 2 + 6 H 2 O → C 6 H 12 O 6 + 6 O 2

The same number of atoms of each element are present both before and after the chemical reaction.

The same number of each kind of molecule is present both before and after the chemical reaction.

The same amount of water is present both before and after the chemical reaction.

The same amount of glucose (C 6 H 12 O 6 ) is present both before and after the chemical reaction.

Three examples of physical changes are ______________________.(SC.8.P.9.3)

boiling of water, bursting of a balloon, and crumpling a piece of paper

burning of gasoline, rotting of an egg, and exploding fireworks

freezing of water, evaporation of gasoline, and rusting a nail

sawing of wood, crushing a can, and toasting a marshmallow

Galvanizing is a process of:

Applying a Zinc coating to bare steel

Washing the body with the phosphate coating

Chemically etching primer to steel

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79 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

an atom is

a non metal

a metal

basic unit of matter

a neutron has

positive charge

no charge

negative charge

all the charges

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

a proton has a

positive charge

negative charge

no charge

every charge

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

an electron has

a negative charge

a positive charge

a neutral charge

Every charge

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

a bond formed when atoms share one or more pairs of electrons

ionic bond

covalent bond

no bonds are formed

both types of bonds are formed

the Physical properties of a substance change, but the identity of the substance does not change

physical change

chemical change

physical charge

electric charge

A combination of chemical symbols and numbers to represent a substance

closed circuit

chemical mass

chemical formula

open circuit

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79 questions

an atom is

a neutron has

a proton has a

an electron has

a bond formed when atoms share one or more pairs of electrons

the Physical properties of a substance change, but the identity of the substance does not change

A combination of chemical symbols and numbers to represent a substance

Number of protons and neutrons

substance made of only 1 atom

states of matter

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