Metallic Bonds — Unit test

Question 1

An amount of nitrogen undergoes a physical change and increases its volume. What can be known about this physical change?

Revolt · Accepted Answer

The density changed.

Question 2

Which example illustrates a chemical change?

Revolt · Accepted Answer

burning wood

Question 3

When balanced, which equation would have the coefficient 3 in front of any of the reactants?

Revolt · Accepted Answer

H2SO4 + B(OH)3 B2(SO4)3 + H2O

Question 4

The equation for water is H2 +O2 → H2O. To balance the equation, which coefficient should be placed in front of H2 and H2O?

Revolt · Accepted Answer

2

Question 5

Which property of physical changes explains why matter is conserved in a physical change?

Revolt · Accepted Answer

The bonds between atoms do not break; it is only the arrangement that changes.

Question 6

Four students are analyzing four different substances and recording their findings in this table.Which most describes this table?

Revolt · Accepted Answer

Leonna has a solid, Xiao has a liquid, Blake made a mistake, and Amir has a gas.

Question 7

best

Revolt · Accepted Answer

The atoms in hydrogen peroxide are breaking apart and forming new types of molecules.

Question 8

What else is produced during the replacement reaction of magnesium and hydrochloric acid?Mg + 2HCl H2 + ________

Revolt · Accepted Answer

MgCl2

Question 9

Which type of reaction is Mg + S → MgS?

Revolt · Accepted Answer

synthesis

Question 10

Marco wants to investigate the chemical properties of sodium bicarbonate, or baking soda. He plans to carry out the tests below.Test 1: Mix a teaspoon of sodium bicarbonate into a cup of warm water to see if it dissolves.Test 2: Mix a teaspoon of sodium bicarbonate into a cup of vinegar to see if it fizzes.Test 3: Heat a teaspoon of sodium bicarbonate in the oven to see if its melting point is less than 400 degrees Fahrenheit.

Revolt · Accepted Answer

Only Test 2 will indicate a chemical property of sodium bicarbonate. Tests 1 and 3 will show a physical property of the substance.

Metallic Bonds — Unit test Answers

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