ICP Unit 1 Post Test_ Matter and Atomic Structure

Emma is doing a laboratory experiment to separate components of crude oil. She decides to use a technique that will separate the components based on their boiling points. Which technique uses this principle?

• filtration

• distillation

• centrifugation

• chromatography

• titration

Consider a mixture of soil and water and compare it to a colloid, such as milk. Which property best differentiates these two mixtures?

• Soil and water is a suspension because it consists of minute particles suspended in the medium. Milk is a colloid because it consists of larger particles suspended in the medium, which start to settle when allowed to stand.

• Soil and water is a colloid because it consists of minute particles suspended in the medium. Milk is a suspension because it consists of larger particles suspended in the medium, which start to settle when allowed to stand.

• Soil and water is a colloid because it has a uniform composition. Milk is a suspension because it doesn’t have a uniform composition.

• Soil and water is a suspension because it consists of larger particles suspended in the medium, which start to settle when allowed to stand. Milk is a colloid because it consists of minute particles that remain suspended in the medium.

• Soil and water is a suspension because it has a uniform composition. Milk is a colloid because it doesn’t have a uniform composition.

What kind of matter is smoke?

• solution

• suspension

• colloid

• compound

• molecule

Oxygen is composed of only one kind of atom and can't be separated into simpler substances. What type of matter is it?

• solution

• element

• mixture

• compound

• colloid

An apple pudding is prepared by combining apples, sugar, butter, and lemon juice. To which category does it belong?

• compound

• mixture

• element

• molecule

• atom

Which statement correctly describes a physical change?

• involves breaking and creating chemical bonds but not changing a phase

• may involve a change in phase but does not involve a change in the molecular structure

• may involve converting two or more substances into new substances

• involves changes at the molecular level

• involves energy transfer and change in color

Which is an example of a chemical change?

• mixing of poster colors

• formation of clouds

• metal corroding in salt water

• sugar dissolving in water

• separating salt from seawater

Which is a chemical property of vinegar?

• The pH of vinegar is around 2.4.

• Vinegar freezes at around 2°C.

• Vinegar boils at about 100°C.

• The color of vinegar ranges from colorless to brown.

• Vinegar is a transparent liquid.

Ground water has some minerals dissolved in it. If you heat this water, collect the vapor in another container, and then cool it, you will get pure, or distilled, water. What makes this process a physical change?

• It forms a new substance (minerals), which is a physical change.

• It forms a new substance (water vapor), which is a physical change.

• It changes the color of water, which is a physical change.

• It changes the molecular structure of water, which is a physical change.

• It separates dissolved substances, which is a physical change.

In caves, dripping groundwater containing calcium bicarbonate can form stalactites and stalagmites. When the water is exposed to air, some of the calcium bicarbonate turns into calcium carbonate, which gets deposited on the ground. What makes this process a chemical change?

• A. A new substance is formed in this process, which is an important clue to chemical change.

• B. A change in state is observed in this process, which is an important clue to chemical change.

• C. This process involves separation of dissolved substances, which is an important clue to chemical change.

• D. This process involves dissolving substances together, which is an important clue to chemical change.

• E. This process involves breaking and reshaping of substances, which is an important clue to chemical change.