Quiz about 7.6A Chemical and Physical changes (enzymes)

Question 1

When you chew a piece of food, your salivary glands release saliva to moisten the food allowing you to swallow the consumed food for the next step of digestion. Additionally, saliva has enzymes that begin to breakdown the starches within the food into smaller molecular components called glucose. What kind of change results from the breakdown of starch into glucose by saliva?

Accepted Answer

chemical

Answer

mechanical

Answer

physical

Answer

cyclical

Question 2

What change occurs to food by your teeth as you chew?

Accepted Answer

physical changes only

Answer

chemical changes only

Answer

both physical and chemical changes

Answer

neither physical nor chemical change

Question 3

Which step in the digestive process represents a chemical change in food?

Accepted Answer

enzymes within the small intestines breaking down the food into smaller molecules

Answer

storing of swallowed food in the stomach

Answer

muscles that line the stomach mixing the consumed food and liquids

Answer

moving the food down the esophagus and into the stomach

Question 4

Your stomach digests a yummy cookie with enzymes. Is this chemical or physical digestion? Is it both?

Accepted Answer

chemical

Answer

physical

Answer

both

Question 5

Which of the following is a chemical change that occurs to the food?

Accepted Answer

The breakdown of molecules of food by enzymes and acid in the stomach

Answer

The reduction in size of food particles as food is chewed

Answer

The movement of food to the stomach after food is swallowed

Answer

None of the above

Question 6

Researchers are investigating processes that happen during digestion. Which answer choice describes only a physical change during digestion?

Accepted Answer

Chewing in the mouth breaks food into small pieces

Answer

Hydrochloric acid in the stomach breaks down proteins

Answer

Enzymes in saliva start the digestion of starches before food is swallowed

Answer

Bacteria in the intestines convert dietary fiber into fats

Question 7

A change in the shape of a substance

Accepted Answer

Physical change

Answer

chemical change

Answer

Chemical Change

Answer

Precipitate

Question 8

A transformation of one substance into another substance

Accepted Answer

Chemical change

Answer

Physical change

Answer

Chemical Reaction

Question 9

Results in a chemical change and the formation of a new substance

Accepted Answer

Chemical reaction

Answer

Chemical change

Answer

Physical change

Answer

Precipitate

Question 10

Evidence of a chemical change

Accepted Answer

Precipitate

Answer

Chemical change

Answer

Physical change

Answer

Chemical reaction

Question 11

A physical change is any change in the ______, _______ or _______ of matter of a substance.

Accepted Answer

shape

Accepted Answer

size

Accepted Answer

phase

Answer

another

Question 12

Examples of physical changes (4 choices)

Accepted Answer

melting

Accepted Answer

freezing

Accepted Answer

condensing

Accepted Answer

breaking

Answer

burning

Question 13

Ten grams of sugar is placed in a beaker with 100ml of water. Initially, the sugar is at the bottom of the beaker however once gradually heated the sugar disappears. Which statement best explains what type of change occurred?

Accepted Answer

physical, reversible change

Answer

chemical, irreversible change

Answer

physical, irreversible change

Answer

chemical, reversible change

Question 14

Which of the following observations indicate that a chemical reaction has taken place? Select TWO correct answers.

Accepted Answer

two solutions being mixed together and a solid is formed

Accepted Answer

gas bubbles forming as a cake is baking in the oven

Answer

liquid water evaporating as a result of thermal energy from the sun

Answer

condensation on the window of a house on a cold day

Answer

a sugar cube dissolving after it has been dropped in a glass of water

Question 15

Which of the following is a sign that a chemical reaction (or change) has occurred?

Accepted Answer

formation of a gas

Answer

change in shape

Answer

melting

Answer

dissolving

Question 16

Is melting butter for popcorn a chemical or physical change?

Accepted Answer

physical

Answer

chemical

Question 17

Is burning wood a chemical or physical change?

Accepted Answer

chemical

Answer

physical

Question 18

Photosynthesis is an example of a

Accepted Answer

chemical change

Answer

physical change

Question 19

Mr. Bob is eating his apple at lunch time. His body is working to aid in digestion of food. Which of the following is a CHEMICAL change that occurs to the food?

Accepted Answer

The breakdown of molecules in the stomach.

Answer

The pieces get smaller and smaller with eat chew.

Answer

The food moving down to the stomach.

Answer

None of the Above.

Question 20

What does it mean when there is a physical change?

Accepted Answer

Matter has changed size, shape, or form.

Answer

Matter has changed from one substance into another.

Answer

Matter has changed on the molecular level.

Answer

A new substance has been formed.

Question 21

When an electric current passes through the wire filament inside a light bulb, the wire filament shines with a bright light and becomes very hot. When the current stos, the wire filament dims and cools. Which of the following is the BEST evidence that these changes are physical properties of the wire filament?

Accepted Answer

The changes are easily reversed.

Answer

The changes produce light.

Answer

The changes are produced by electricity.

Answer

The changes result in the release of heat.

Question 22

Which of the following is NOT an example of a physical change?

Accepted Answer

Soured milk

Answer

Melting chocolate

Answer

Grinding up chalk into a powder

Answer

Ice cream melting

7.6A Chemical and Physical changes (enzymes)

25 questions

What change occurs to food by your teeth as you chew?

Which step in the digestive process represents a chemical change in food?

Your stomach digests a yummy cookie with enzymes. Is this chemical or physical digestion? Is it both?

Which of the following is a chemical change that occurs to the food?

Researchers are investigating processes that happen during digestion. Which answer choice describes only a physical change during digestion?

A change in the shape of a substance

A transformation of one substance into another substance

Results in a chemical change and the formation of a new substance

Evidence of a chemical change

Create a free account and access millions of resources

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science