EPOM Lessons 10-13 Test

You are making a cup of tea. You add sugar and stir until it completely dissolves. What would you call this?

• A homogeneous mixture is a mixture that has a uniform composition throughout.

• A heterogenous mixture is a mixture that can be separated into its components by physical means.

• A homogeneous mixture is a mixture that contains only one type of substance.

• A heterogeneous mixture is a mixture that has a non-uniform composition throughout.

Consider a piece of iron and a piece of wood. When exposed to heat, they react differently. This difference in heat response is a unique property of each substance. Is this statement true?

• True

• False

You are making a salad with different ingredients like lettuce, tomatoes, cucumbers, and olives. What kind of mixture is this?

• A mixture that consists of visibly different substances or phases.

• A mixture that consists of only one substance or phase.

• A mixture that consists of substances that cannot be separated by physical means.

• A mixture that consists of substances that have the same properties.

ou heat a test tube containing sulfur. You notice that the sulfur has changed colors and went from a solid to a liquid. Which of the following terms describes what has taken place? ​ ​ (a)  

• heat reaction
• heat exchange
• thermal replacement
• thermal decomposition

Match the following

• liquid to gas

• melting

• gas to liquid

• freezing

• solid to liquid

• condensation

• liquid to solid

• boiling

In a science experiment, a teacher showed an image with several Xs. What do each of the Xs represent in the image?

• particles in a substance

• dots on a paper

• gas molecules in the air

• liquid droplets in a beaker

You left a bottle of water in the freezer overnight. What state of matter is the water in now?

• solid

• gas

• liquid

• plasma

In a sand sculpture, the sand grains are...

• tightly packed.

• loosely bonded and flowing.

• free to fly in all directions.

• so hot that the electrons are removed from the nucleus.

Imagine you are on a camping trip and you have a 25 grams ice cube in your cooler. After leaving it out in the open for a while, it melts completely. The mass of the water now should be... 

• 12.5 g

• 25 g

• 75 g

• 50 g

Imagine you are a scientist conducting an experiment in your lab. You take a 38 g sample of sulfur and heat it in a test tube. After the reaction, you measure the mass of all the products and find it to be 38 g. Which law does this observation support?

• The Law of Conservation of Products

• The Law of Conservation of Chemistry

• The Law of Conservation of Mass

• The Law of Conservation of Energy