Question 1

What are chemical changes?

Accepted Answer

A process by which one or more substances change into entirely new substances with different properties.

Answer

A change that affects one or more physical properties of a substance that do not change the identity of the substance.

Question 2

What becomes rearranged when a chemical change occurs?

Accepted Answer

particles and chemical bonds

Answer

The temperature of an object

Answer

nothing

Question 3

What are three examples of a physical change?

Accepted Answer

Ice melting, cutting an apple, something painted

Answer

boiling, writing something on a piece of paper,  Wood turning to ash

Answer

something tearing, something changing into an unusual color, something beginning to ripen

Question 4

What does the law of conservation of mass state?

Accepted Answer

In ordinary chemical and physical changes, mass is not created or destroyed → but only transformed into different substances.

Answer

In ordinary chemical and physical changes, mass is  created or destroyed.

Answer

In ordinary chemical and physical changes, mass stays the same.

Question 5

Physical changes:

Accepted Answer

A change that affects one or more physical properties of a substance that do not change the identity of the substance.

Answer

A process by which one or more substances change into entirely new substances with different properties.

Question 6

What three potential things can change, during a physical change?

Accepted Answer

The appearance, shape, or size

Answer

The appearance, shape, or texture

Answer

The appearance, shape, or smell

Question 7

Are chemical changes the same as chemical properties? Explain

Accepted Answer

No,  Chemical property = ability of a substance to undergo a chemical reaction,    chemical change = what happens when chemical reaction occurs

Answer

Yes,  Chemical property and change are both the ability of a substance to undergo a chemical reaction

Answer

Yes,  Chemical change and property are both what happens when a chemical reaction occurs

Question 8

What can make a chemical change occur more quickly?

Accepted Answer

Higher temperature

Answer

Colder temperature

Answer

Pressure

Question 9

What are the five signs that show a chemical change has occurred?

Accepted Answer

Odors
Change in energy
Gas
Formation of participate
Change in color - unusual

Answer

Change in size                          change in shape                      change in appearance              change in temperature     change in energy

Answer

1: change in color                             2: the object is heavier than usual                                       3: the size of the object changes                                           4: It is harder                            5: If its water - boiling

Question 10

Suppose a log of wood weighs 12 pounds. After burning, the mass of the ash is less than 1 lb. What may have happened to the other 11 pounds?

Accepted Answer

The other 11 pounds either turned into:
Gas
Soot
Ash

Answer

The other 11 pounds evaporated into the air

Answer

The other 11 pounds became part of the fire

Question 11

Chemical or Physical:                                                                                                                                                                   Milk souring

Accepted Answer

Chemical

Answer

Physical

Question 12

Physical or Chemical:
Ice Melting

Accepted Answer

Physical

Answer

Chemical

Question 13

Physical or Chemical
Grass growing

Accepted Answer

Chemical

Answer

Physical

Question 14

Physical or Chemical
Burning a marshmallow

Accepted Answer

Chemical

Answer

Physical

Question 15

Physical or Chemical
Boiling water

Accepted Answer

Physical

Answer

Chemical

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