Cba Review Chemistry

4) The particles in a liquid are usually:

• Closer together and lower in energy than those in a solid

• Farther apart and higher in energy than those in a gas

• Closer together and lower in energy than those in a gas

• Farther apart and lower in energy than those in a solid

5) The compressibility of solids is generally

• lower than the compressibility of liquids and gases

• higher than the compressibility of liquids only

• about equal to the compressibility of liquids and gases

• higher than the compressibility of gases only

6) Particles within a solid

• do not move

• move about freely

• vibrate about fixed positions

A chemistry student’s investigation is described below.

1. The student obtains 15 g of an unknown substance.

2. The student notes that at room temperature the substance is a solid and is colored white.

3. The student determines that the density of the substance is 2.17 g/cm3

4. The student then determines that the substance is soluble in water.

The student determines that the unknown substance is sodium chloride. Which of the following property of sodium chloride is affected by amount/size?

• Mass of 15 g

• White color

• Density of 2.17 g/cm³

• Solubility in water

Which statement examines an property of an item that is not affected by size?

• The mass of the item

• The mass and volume of the item to determine its density

• The volume of the item

• The mass of the item and then the volume of the item

Which is one way a chemical property can be observed?

• Heating a substance to its boiling point

• Passing an electrical current

• Examining a substance under a microscope

• Observing how one substance reacts with another

Tags

NGSS.MS-PS1-2

A solution of sugar dissolved in water is placed into a 250mL beaker. The mixture is then heated causing the water to evaporate. The sugar is recovered and heat is applied again. Vapor is released, and the material in the beaker changes from white to black. What must you know to determine if a chemical change occurred?

• whether or not the black substance is sugar

• The boiling point of sugar

• The temperature at which sugar evaporates

• The boiling point of water

Tags

NGSS.MS-PS1-2

Which statement describes a chemical property of oxygen?

• Oxygen gas can be compressed

• Oxygen gas is slightly soluble in water

• Oxygen can combine with a metal to produce a compound.

• Oxygen has a melting point of -218.25 degrees C.

Which one of the following statements is true of EITHER chemical and physical changes?

a)

b)

c)

d)

• The formation of H_{2 (g)} when magnesium is dropped in hydrochloric acid indicates that a chemical change has occurred.

• Candles burning is a physical change

• The solidification of wax is a chemical change.

• Dissolving salt in water is a chemical change.

Tags

NGSS.MS-PS1-2

Which Chemistry terms are used to identify pure substances?

• And element and a mixture

• a solution and a mixture

• An element and a compound

• a solution and a compound