Unit Test — Unit test

Question 1

Food can spoil very quickly. Which methods are used to minimize the reactions that allow bacteria and fungi to grow?

Revolt · Accepted Answer

preservatives and low temperature

Question 2

Kiley wants to balance the equation H2 + N2 → NH3. Which would be her first step in balancing an equation?

Revolt · Accepted Answer

creating a chart that shows the number of atoms in the reactants and products

Question 3

One half of a balanced chemical equation is shown.3Mg(OH)2 + 2H3PO4Which lists the numbers of each atom the other half of the equation would contain?

Revolt · Accepted Answer

3 Mg, 2 P, 14 O, 12 H

Question 4

The pictures represent three different states of matter.

Revolt · Accepted Answer

Y → Z → X

Question 5

Harvey mixes two liquids. Which observation of the new mixture most likely indicates a precipitate is forming?

Revolt · Accepted Answer

a cloudy appearance

Question 6

Which statement best describes the diagram below?

Revolt · Accepted Answer

The pressure is greater at the bottom of the container.

Question 7

Which balances the equation Mg + O2 → MgO?

Revolt · Accepted Answer

2Mg + O2 → 2MgO

Question 8

What are the products of the combustion of a hydrocarbon?

Revolt · Accepted Answer

carbon dioxide and water

Question 9

Which condition must be met in order for an equation to be balanced?

Revolt · Accepted Answer

The number of atoms in the reactants equals the number of atoms in the products.

Question 10

What else is produced during the combustion of butane, C4H10?2C4H10 + 13O2 8________ + 10H2O

Revolt · Accepted Answer

CO2

Unit Test — Unit test Answers