Science test chapter 3

56.8%

A 25.0-gram sample of magnesium oxide contains 10.8 grams of magnesium. What is the percent of oxygen by mass in this compound? a. 89.2 % b. 14.2 % c. 43.2 % d. 56.8 %

False

A carbonated beverage that contains carbon dioxide gas in a solution is an example of a liquid-gas system. True/False

True

A change in state of matter is a physical change. True/False

False

A change of state is a chemical change because ice and water do not resemble one another. True/False

True

A chemical change is always accompanied by changes in physical properties. True/False

Compound

A chemical composition of two or more different elements joined together in fixed proportions is known as a(n) ____. a. compound b. element c. homogeneous mixture d. heterogeneous mixture

True

A solid cannot be compressed because its particles are tightly packed. True/False

True

Chemical and physical properties are affected by the environment in which the substance exists. True/False

False

Compounds can be separated into their component elements by a series of physical changes. True/False

True

Crystallization is a separation technique used to produce rock candy from a sugar solution. True/False

Liquid

Elemental bromine occurs in the ____ state at room temperature. a. gaseous b. liquid c. plasma d. solid

3

How many different elements are represented in the figures? a. 2 b. 3 c. 6 d. 12

4

How many individual atoms make up one unit of aluminum chloride, AlCl3? a. 1 b. 2 c. 3 d. 4

True

Matter that has a uniform and unchanging composition is called a pure substance. True/False

Substance

Matter that has a uniform and unchanging composition is known as a(n) ____. a. compound b. element c. mixture d. substance

True

Mendeleev's original table could accommodate elements that did not even exist. True/False

False

Milk is a homogeneous mixture. True/False

False

Mixtures can be separated by a series of physical changes. True/False

True

Orange juice is a heterogeneous mixture. True/False

NO2

Samples of gases containing nitrogen and oxygen were decomposed by electricity and the volume of each gas produced was measured. Based on these results, which is the correct chemical formula for Sample 2? a. N2O3 b. NO c. NO2 d. N2O

N2O

Samples of gases containing nitrogen and oxygen were decomposed by electricity and the volume of each gas produced was measured. Based on these results, which is the correct chemical formula for Sample 4? a. N2O3 b. NO c. NO2 d. N2O

False

Seawater is a substance. True/False

False

Solids can be recognized because they are hard and rigid. True/False

False

The change in the color of tree leaves in fall is an example of a physical change. True/False

D

The figure shows the results of paper chromatography of a mixture of pigments. Based on the results shown, which pigment has the greatest attraction for the paper? a. A b. B c. C d. D

Definate Proportions

The law of ____ states that a compound is always composed of the same elements in the same proportion by mass. a. conservation of energy b. conservation of mass c. definite proportions d. multiple proportions

Conserved

The law of conservation of mass states that during a chemical reaction, total mass is ____. a. created b. conserved c. destroyed d. utilized

False

The magnetization of an iron rod is an example of a chemical change. True/False

False

The periodic table organizes elements into a grid of vertical columns known as periods. True/False

False

The properties of a compound are the same as the properties of the element that is present in the largest proportion of the compound. True/False

False

The terms gas and vapor can be used interchangeably. True/False

Condensation

What is the change of state in which a gas becomes a liquid? a. sublimation b. freezing c. condensation d. melting

Melting

What is the change of state in which a solid becomes a liquid? a. liquefaction b. melting c. condensation d. sublimation

False

When a chemical change occurs, the products have a greater mass than the reactants. True/False

Element

Which describes the composition of matter shown in figure B? a. element b. compound c. mixture d. phase

Mixture

Which describes the composition of matter shown in figure C? a. element b. compound c. mixture d. phase

Ingredients for a cake are stirred together

Which is NOT a chemical change? a. a piece of wood is burned b. an egg is cooked c. a bar of iron rusts d. ingredients for a cake are stirred together

Reacts in air to form green layer

Which is a chemical property of copper? a. has a boiling point of 2567 °C b. reacts in air to form a green layer c. has the symbol Cu d. is a solid at room temperature

Carbon Dioxide

Which is a compound? a. sodium b. sea water c. carbon dioxide d. brass

Clean air

Which is an example of a homogeneous mixture? a. sand b. clean air c. vegetable soup d. fresh-squeezed orange juice

Length

Which is an extensive physical property? a. color b. length c. density d. boiling point

Color

Which is an intensive physical property? a. color b. mass c. length d. volume

Chromatography

Which is the separation technique that identifies parts of a mixture based on how fast different compounds move across a material? a. filtration b. distillation c. chromatography d. crystallization

Distillation

Which is the separation technique that relies on the different boiling points of the parts of the mixture? a. filtration b. distillation c. chromatography d. crystallization

Gas

Which is the state of matter shown in this figure? a. solid b. liquid c. gas d. plasma

Liquid

Which is the state of matter shown in this figure? a. solid b. liquid c. gas d. plasma

Solid

Which is the state of matter shown in this figure? a. solid b. liquid c. gas d. plasma

Solid

Which is the state of matter that has a definite shape and definite volume? a. solid b. liquid c. gas d. plasma

Liquid

Which is the state of matter that has an indefinite shape and definite volume? a. solid b. liquid c. gas d. plasma

Gas

Which is the state of matter that has an indefinite shape and indefinite volume? a. solid b. liquid c. gas d. plasma

Filtration

Which is the type of separation technique being demonstrated in the figure? a. crystallization b. distillation c. filtration d. chromatography

A formation of a drill gauge and wire

Which of the following formations is a physical property of copper? a. A deep blue solution when in contact with ammonia. b. A new substance when combined with nitric acid. c. A green copper carbonate compound when in contact with moist air. d. A formation of a drill gauge and wire.

Tin

Which of the following substances is NOT an alloy? a. Brass b. Bronze c. Stainless steel d. Tin

Gasoline

Which of the following substances is a mixture? a. Baking soda b. Gasoline c. Salt d. Sugar

Iron

Which of the following substances is an element? a. Baking soda b. Iron c. Salt d. Sugar

Compound

Which term describes the composition of matter shown in figure A? a. element b. compound c. mixture d. phase

True

An alloy is a special type of homogeneous mixture. True/False

False

An intensive physical property is one that depends on the amount of matter present. True/False

The mass of reactants is equal to the mass of products

According to the Law of Conservation of Mass, in any chemical change a. the mass of reactants is greater than the mass of products b. the mass of reactants is less than the mass of products c. the mass of reactants is equal to the mass of products d. the masses of products and reactants have no predictable relationship