Science Warm Up 4/5 (Group A)

Which of the formulas above contain equal numbers of nitrogen atoms?

• Formulas I and III

• Formulas I and V

• Formulas II and III

• Formulas I, II, and V

Tags

NGSS.MS-PS1-1

For a laboratory investigation some students put a strip of shiny metal into a beaker of blue solution and then stored the beaker on a shelf overnight. The next morning, the students recorded observations about the metal and the solution in the box below.

Based on their observations, can the students correctly conclude that a chemical reaction occurred?

• No, because the metal strip was still visible

• Yes, because a new material of a different color formed on part of the metal strip

• No, because the solution stayed blue

• Yes, because the volume of the blue solution stayed the same

Tags

NGSS.MS-PS1-2

A chemical equation for the reaction between calcium hydroxide, Ca(OH)₂, and sulfuric acid, H₂SO₄ is shown. The masses of some of the reactants and products are given in grams.

How many grams of sulfuric acid were used in the reaction?

• 62 g

• 98 g

• 36 g

• 100 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The chemical equation above demonstrates that —

• matter cannot be created or destroyed by a chemical reaction

• the reactants are the same substances as the products

• the number of molecules is equal

• the elements on the reactants side are changed into different elements on the products side

Tags

NGSS.MS-PS1-5

Which of the substances produced a chemical change?

• Substances 1 and 2

• Substances 1 and 3

• Substances 1 and 4

• Substances 2 and 3

Tags

NGSS.MS-PS1-2