Evidence and changes in the digestive system weekly Test

A student is performing experiments in a laboratory. Which of these is evidence that a chemical change has occurred?

• Water changes from liquid to gas

• A substance changes shape

• A substance dissolves in water

• A solid formed at the bottom of the beaker

Tags

NGSS.MS-PS1-2

What does each circle or sphere in the diagram represent?

• A molecule

• A compound

• An atom

• A mixture

Tags

NGSS.MS-PS1-1

2Al₂O₃ → 4Al + 3O₂

? → 128g + 89g

A chemical reaction is shown above. What is the mass of the Reactants in this chemical reaction?

(a)  

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A student is modeling a volcanic eruption using baking soda and vinegar. Upon mixing these materials, the student hears a hissing sound and sees bubbles. This is evidence that

• Evaporation occurs when solids and liquids mix

• A physical change has turned a solid and liquid into a gas

• A chemical reaction has formed a new substance

• Atoms are multiplying to form matter

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which changes occur when food is chewed?

• Physical changes only

• Chemical changes only

• Both physical and chemical changes

• Neither physical nor chemical changes

Tags

NGSS.MS-PS1-2

In a laboratory, Hydrogen gas is combined with one-half as much Oxygen gas to produce the liquid commonly called water. What evidence suggests that a chemical reaction has occurred?

• A change of state took place

• A new substance formed

• Less matter is present after substances joined

• More matter is present after substances joined

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following describes a physical change which occurs during the digestive process?

• The partial breakdown of food in the mouth by saliva

• The breakdown of Carbohydrates in the stomach by Hydrochloric Acid

• The changing of large fat globules into smaller, simpler substances in the liver

• The change in shape of food as it is chewed

Which organ is responsible for the chemical digestion of gastric juices and Hydrochloric acid reacting with the food in the human body?

• Mouth

• Stomach

• Small intestine

• Large intestine

When 2 or more substances chemically combine, they

• Form a mixture

• Form a new substance with different properties

• Become elements

• Stay the same

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Mrs. Rosales performed a demonstration of a chemical reaction for her science class. In a well-ventilated room, she added a sulfuric acid solution to a beaker containing granulated sugar. The mixture immediately becomes very hot and released water vapor into the air. The sugar appeared to burn and was transformed into a rapidly growing column of solid black material. The experiment also produced a foul-smelling odor. Which observation does NOT provide evidence of a chemical reaction?

• The mixture immediately become very hot

• Water vapor was released into the air

• The sugar was transformed into a solid black material

• The mixture released a foul-smelling odor

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4