7.L.1.4

Mass, volume, or density of an object is a _______________ property of that object.

• Chemical

• Physical

Which is the correct way to balance the chemical equation shown below?

Tags

NGSS.MS-PS1-5

Which BEST describes how to balance the chemical equation shown below to support the law of conservation of mass?

• Add the coefficient 2 before the Mg on both sides of the equation.

• Add the coefficient 2 before the Mg on the left side of the equation.

• Add the coefficient 2 before the MgO on the right side of the equation.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which BEST explains how the chemical reaction shown below follows the law of conservation of mass?

• The hydrogen and oxygen molecules combine to form water.

• Hydrogen and oxygen are held together by strong chemical bonds.

• There are hydrogen and oxygen atoms on both sides of the equation.

• The same number of hydrogen and oxygen atoms are on both sides of the equation.

Tags

NGSS.MS-PS1-5

A chemistry student combines 32 grams of one chemical and an unknown amount of another chemical in a closed system. A chemical reaction occurs and the mass of the products is 114 grams. How much of the unknown chemical was used in the reaction?

• 32 grams

• 82 grams

• 114 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In the equation below, suppose 11 grams of zinc react with 12 grams of hydrogen chloride to form 16 grams of zinc chloride and an unknown amount of hydrogen gas. Based on the Law of Conservation of Mass, how many grams of hydrogen gas will form?

• 1 gram

• 7 grams

• 19 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The following chemical reaction occurs. How many atoms of hydrogen are involved in the reaction?

• 1

• 2

• 4

• 8

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

What is the importance of a closed container in a chemical reaction?

• to observe the mass before and after the reaction occurs

• to keep any materials from interfering with the reaction

• to observe the loss of mass after the reaction occurs

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A group of students are studying bean plants. All of the following traits are affected by changes in the environment except

• leaf color.

• seed type.

• bean production.

• plant height.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Steve’s class is visiting the zoo. He observes that the stripe patterns of two zebras are very different. Which most likely explains why the zebras have different stripe patterns?

• The zebras eat different types of grass.

• The zebras are active at different times of the day.

• The zebras react to their habitat at the zoo in different ways.

• The zebras are expressing the trait for stripe pattern in different

  ways.

Tags

NGSS.MS-LS3-1

NGSS.MS-LS4-4