Unit 4 Elemental Properties

Tim is testing how the amount of sugar dissolved in water affect the mixture's density. Which statement best represents a hypothesis for Tim's investigation.

• The greater the amount of sugar in the, the more dense the mixture

• The warmer the water, the faster the sugar will dissolve.

• Sugar water is more dense than regular water.

• Sugar increases the density of water more than salt.

A group of students are given three different-colored circles to make an atomic model of a carbon atom. The chart shows the the colored circle that represents each particle in the atom. Which diagram represents the correct atomic model for a carbon atom?

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Which model accurately shows the charges and relative sizes of the subatomic particles that compose an atom.

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The image shows an incomplete model of an atom. What particles should be placed inside the nucleus?

• protons only

• electrons only

• electrons and protons

• neutrons and protons

Sulfur is a light yellow solid that is dull and brittle. What can be inferred about sulfur based upon this information?

• its a metal

• it is a nonmetal

• it is a compound

• it is a mixture

Which statement describes a chemical property?

• Steel is shaped into automobile fenders.

• Water begins to boil when it reaches 100C.

• Oil floats on water because it is less dense.

• Iron slowly forms rust when exposed to oxygen gas.

Which example describes a chemical property?

• Zinc and hydrochloric acid react to produce hydrogen gas.

• Helium-filled balloons float because helium is less dense than air.

• White sugar crystals become colorless when dissolved in hot water.

• Tungsten has a high melting point, so it is used in making light bulb filaments.

Which property is generally characteristics of solid nonmetallic elements?

• brittle

• good conductor

• luster

• high density

A students places a small stone with a mass of 5 g into a graduated cylinder containing 50 ml of water. With the stone in the graduated cylinder, the water rises to 75ml. What is the density of the stone?

• 0.07 g/mL

• 0.20 g/mL

• 5.00 g/mL

• 125.00 g/mL

Examine the equation. Density=Mass/Volume What is the density of an object with a mass of 20 g and volume 10cm3?

• 0.5 g/cm3

• 2.0 g/cm3

• 10.0 g/cm3

• 200.0 g/cm3