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WorksheetsChemical Changes
Total questions: 40
Worksheet time: 26mins
Which of the following is a sign that a physical change has occurred?
Bubbles forming
The object being broken into smaller pieces
Heat being produced
Light being produced
What kind of energy is food?
Thermal energy
Mechanical energy
Solar energy
Chemical energy
An object undergoes a physical change when it changes:
color, burning, rusting
shape, form, color
tarnishing, melting, ashes
An object undergoes a chemical change when it changes:
shape, form, state of matter
melting, odor, size
color, burning, rusting
When tearing a piece of paper, the mass will __________ because of the law of conservation of mass.
increase
decrease
stay the same
Bubbles quickly appear but then they disappear and there is no solid in the final observation.
physical change
chemical reaction
The chewing and grinding of food into smaller pieces is an example of/La masticación y molienda de alimentos en trozos más pequeños es un ejemplo de ...
Mechanical Digestion/Digestión mecánica
Chemical Digestion/digestión química
Enzymes (chemicals) in your saliva help break down food while chewing. This is/Las enzimas (productos químicos) en su saliva ayudan a descomponer los alimentos mientras mastica. Esto es...
Mechanical digestion/Digestión mecánica
Chemical digestion/Digestión química
What organ carries food from the mouth to the stomach?
esophagus
small intestine
large intestine
liver
Digestion begins _____
in the mouth
in the esophagus
in the stomach
in the liver
Chewing food is an example of
chemical digestion
mechanical digestion
What chemical is used to digest food in the stomach?
amylase
insulin
acid
chyme
What is the main purpose of the large intestine?
it absorbs hormones
it absorbs nutrients
it absorbs water
it absorbs proteins
Many processes occur in the digestive system. Which process is best classified as a chemical change?
Teeth grinding candy
Absorption of water
Enzymes in the saliva
Peristalsis in the esophagus
Which of the following best identifies a physical digestive process?
acid secretion
enzyme action
peristalsis
_________________ is when the body breaks down food into small units of nutrients that can be absorbed and used for energy.
digestion
enzyme
peristalsis
Which of the sequences best describes how a piece of chicken nugget is digested in the human body?
mouth, stomach, small intestine, large intestine, esophagus
mouth, esophagus, stomach, small intestine, large intestine
Type of digestion in the stomach:
Mechanical
Chemical
Both
