The formula H2O represents which elements and how many atoms of each element?

The formula represents 2 hydrogen atoms and 1 oxygen atom.

The formula represents 1 hydrogen atom and 2 oxygen atoms.

The formula represents 2 oxygen atoms and 1 hydrogen atom.

The formula represents 1 oxygen atom and 1 hydrogen atom.

The table lists some compounds found in foods and their formulas. Based on this information, which of these statements is NOT true?

D. A molecule of lactose contains twice as many carbon atoms as a molecule of sorbitol does.

A. A molecule of sorbitol contains three more oxygen atoms than a molecule of glutamine does.

B. A molecule of lactose contains twice as many atoms as a molecule of fructose does.

C. A molecule of fructose contains four more atoms than a molecule of glutamine does.

A student is using colored beads to make a model of aluminum sulfate, Al2(SO4)3. Aluminum atoms are represented by blue beads, sulfur atoms by yellow beads, and oxygen atoms by green beads. What combination of beads should the student use for the model?

6 blue, 12 yellow, and 12 green

Which information could a student determine from only the chemical formula of a protein?

The number of atoms of each element in the protein

The number of molecules in each sequence that makes up a protein

The physical arrangement of atoms in the structure of the protein

Many processes occur in the digestive system. Which process is best classified as a physical change?

Teeth grinding an almond into smaller pieces in the mouth

Saliva converting the starch molecules in crackers into simple sugars

Digestive enzymes breaking down proteins into smaller fragments

Bacteria converting lactose into simple sugars in the intestines

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

Chewing in the mouth breaks food into small pieces.

Hydrochloric acid in the stomach breaks down proteins.

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

Bacteria in the intestines convert dietary fiber into fats.

Both the esophagus and the small intestine are involved in the digestion of food. The esophagus squeezes food into the stomach by wave-like muscle contractions. Peptidase enzymes in the small intestine break food molecules into smaller molecules. Which statement best describes changes to food during digestion?

The muscle contractions result in physical changes, while the action of the peptidase results in chemical changes.

The muscle contractions and the action of the peptidase both result only in physical changes.

The muscle contractions result in chemical changes, while the action of the peptidase results in physical changes.

The muscle contractions and the action of the peptidase both result only in chemical changes.

A student listed how different parts of the body work to aid in the digestion of food. Part of Body | Action Mouth | Teeth tear and crush food into small pieces so that food can be swallowed. Mouth | Saliva is mixed with food to make food particles softer and easier to swallow. Stomach | Hydrochloric acid and enzymes help break down food molecules into smaller molecules. Which of the following is a chemical change that occurs to the food?

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

The reduction in size of food particles as food is chewed

The movement of food to the stomach after food is swallowed

7.6ABC Test Review

Authored by Anna Uribe

Science

7th Grade

NGSS covered

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29 questions

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MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Which chemical is a compound?

helium (He)

hydrochloric acid (HCl)

hydrogen (H2)

nitrogen (N2)

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Which of the following is best classified as a compound?

Helium (He), because it contains only one type of atom

Oxygen (O2), because it contains two of the same type of atoms

Carbon dioxide (CO2), because it contains two different types of atoms

Manganese (Mn), because it contains a metal and a nonmetal

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

When electricity passes through water, hydrogen and oxygen are produced. Which table correctly labels the compounds and elements involved in the process?

Water–Compound, Hydrogen–Compound, Oxygen–Element

Water–Compound, Hydrogen–Element, Oxygen–Compound

Water–Compound, Hydrogen–Element, Oxygen–Element

Water–Element, Hydrogen–Element, Oxygen–Compound

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

How are carbohydrates and oxygen classified? (Carbohydrates are made of oxygen, hydrogen and carbon atoms bonded together.)

Carbohydrate is a compound. Oxygen is an element.

Carbohydrate is a compound. Oxygen is a mixture.

Carbohydrate is an element. Oxygen is an element.

Carbohydrate is an element. Oxygen is a mixture.

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Which pure substance is composed of more than one element?

carbon

gold

water

sodium

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which two substances are elements?

sand and air

salt and sand

iron and helium

helium and water

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Which of these diagrams most likely represents the chemical structure of a substance that is a pure element?

[Diagram a]

[Diagram b]

[Diagram c]

[Diagram d]

Tags

NGSS.MS-PS1-1

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7.6ABC Test Review

Which chemical is a compound?

Which of the following is best classified as a compound?

When electricity passes through water, hydrogen and oxygen are produced. Which table correctly labels the compounds and elements involved in the process?

How are carbohydrates and oxygen classified? (Carbohydrates are made of oxygen, hydrogen and carbon atoms bonded together.)

Which pure substance is composed of more than one element?

Which two substances are elements?

Which of these diagrams most likely represents the chemical structure of a substance that is a pure element?

Which molecule represents an element?

Which of the following is not an element?

Refer to the Venn diagram and the list of characteristics below: Which of the following would be found only in the Elements side of the Venn diagram above?

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