BYU Chemistry - Unit 1 Quiz

If my mass on earth is 125 kg, what would my mass be on the moon, where gravity is 1.63 m/s/s?

125 kg

When 135 g of iron reacts with 35 g of oxygen gas to form iron (II) oxide, no iron or oxygen is left over. How much iron (II) oxide is produced?

170 g

If your weight on earth is 107 pounds and the force of gravity on the sun is 27 times the gravity of the earth, what would your weight be on the sun?

2889 pounds

What are the reactants in the following equation? 2Al + 6HCl → 2AlCl3+ 3H2

Al and HCl

Stewart is about to jump from the high dive. At point A, he is leaving the board, at point B, he is halfway to the water below, and at point C, he is about to reach the water. What is true of Stewart's potential energy?

It is lower at point C than at point A.

Which of the following is a heterogeneous mixture? 1. Kool-Aid 2. 7-UP 3. Italian salad dressing 4. saltwater

Italian salad dressing

What is the difference between mass and weight?

Mass is measured in kg and weight is measured in pounds.

What are the products in the following equation? Mg + 2HF → MgF2+ H2

MgF2 and H2

Is a bike rusting a physical or a chemical change?

a chemical change

Is grapes fermenting a physical or a chemical change?

a chemical change

Is silver tarnishing a physical or a chemical change?

a chemical change

When a student burns a piece of aluminum, they see a bright light and are left with a new powdery substance. What has this student observed?

a chemical change

What is a heterogeneous mixture?

a mixture in which the composition is not the same throughout the mixture

Is dissolving salt in water a physical or a chemical change?

a physical change

Is slicing an apple a physical or a chemical change?

a physical change

Which of the following has the lowest amount of kinetic energy? 1. a ball traveling at 40 mph 2. a ball traveling at 60 mph 3. a ball traveling at 20 mph 4. a still ball

a still ball

In which of the following examples does a chemical change occur? 1. Salt deposits form from evaporated seawater. 2. Butanol is purified through distillation. 3. Dissolved sugar solidifies to form crystals. 4. baking a cake

baking a cake

Which of the following is a pure substance?' 1. melting 2. burning 3. rusting 4. igniting

barium chloride

Chemical energy in a battery turns into electrical energy in your iPod, which turns into mechanical energy as sound waves bombard your eardrums and enable you to hear the music. Why does this happen?

because of the law of conservation of energy, which tells us that the amount of energy that was used from the battery is the same amount of energy that reached your eardrums

Which of the following is not a physical change? 1. cutting 2. freezing 3. crumpling 4. digesting

digesting

A student boils a mixture to separate the components based on their boiling points. This is an example of what kind of separation technique?A student boils a mixture to separate the components based on their boiling points. This is an example of what kind of separation technique?

distillation

A student wants to separate a mixture of salt and water from the ocean. Which separation technique would he or she use?

distillation

Which of the following is a heterogeneous mixture? 1. seawater 2. sucrose 3. granite 4. a gold ring

granite

Which of the following is not a chemical change? 1. melting 2. burning 3. rusting 4. igniting

melting

Which of the following is a homogeneous mixture? 1. perfume 2. ramen noodles 3. marble 4. dirt

perfume

Which of the following is a compound? 1. magnesium 2. oxygen 3. water 4. sodium

water

Which of the following is a homogeneous mixture? 1. bag of M&M's 2. windex 3. Italian salad dressing 4. orange juice

windex

In which of the following examples does a physical change occur? 1. Water freezes to make ice cubes. 2. A ring turns your finger green. 3. A silver ring tarnishes. 4. An apricot spoils.

Water freezes to make ice cubes.

Which of the following statements is true of weight? 1. Weight is measured with a balance. 2. The weight of an object is the amount of matter in an object. 3. Weight is expressed in grams. 4. Weight is measured with spring scale.

Weight is measured with spring scale.