Show:
Classification of matter
Atoms and Elements
Physical Chemistry/Universe
Chemical Changes/Universe
Scientific Method
100

  1. In a neutralization reaction, an acid and a base neutralize each other. Water is one of two products that are produced from the neutralization reaction. What is the other product?
    a. A gas
    b.A salt
    c.A protein
    d.A metal



b.A salt

100

  1. A compound consists of two or more elements that have combined. Which of the following compounds contains three different elements?

    1. O3

    2. H2O

    3. MgO

    4. H2SO4

H2SO4

100

  1. Solid, liquid, and gas are three states of matter. Which of the following correctly pairs a state of matter and its description?


    1. Gas–particles that do not move about freely

    2. Liquid– particles that are the closest together of all three states

    3. Solid– vibrating particles that are fixed in place

    4. Gas– slowest moving particles of all three states

Solid– vibrating particles that are fixed in place

100

  1. Which of the following best describes a chemical change?

    1. Bending a steel bar

    2. Splitting a wooden board into two pieces

    3. Baking cookies

    4. Slicing carrots

Baking cookies

100

  1. Experiments are often repeated many times by the same or different scientists. What is the most important reason more than one scientist should conduct an investigation using the same methods?

    1. If the results are the same, replication of the investigation helps to confirm the results.

    2. The competition makes the scientists work more carefully.

    3. More than one scientist is interested in the problem.

    4. Different scientists might perform the experiment differently.

  1. If the results are the same, replication of the investigation helps to confirm the results.

200

  1. In science class, Jonathan added a small amount of sand to a beaker of water. He stirred it vigorously so that all the sand swirled around in the water. Jonathan then claimed to his classmates that he had made a solution. However, his teacher told Jonathan that he was mistaken. Why was the teacher correct?

    1. Jonathan made a compound, not a mixture.

    2. A solid substance cannot dissolve in water to form a solution.

    3. The sand will eventually settle to the bottom and will not dissolve in the water.

    4. A chemical reaction did not take place, so a solution was not formed.

The sand will eventually settle to the bottom and will not dissolve in the water.

200

  1. Atoms are the smallest unit of an element and are composed of subatomic particles. An atom that has a balanced charge is referred to as “neutral”. Which of the following statements must be true about a neutral atom?

    1. The atom must have an even number of protons.

    2. The atom must have as many neutrons as protons.

    3. The number of electrons and protons in the atom must be equal.

    4. All of the neutrons and protons are found in the nucleus of an atom.

The number of electrons and protons in the atom must be equal.

200

  1. Jessica did an investigation about the states of matter. As part of the investigation, Jessica wanted to change a liquid into a solid. What must she do to bring about this change in state?

    1. Place the liquid in a different container.

    2. Stir the liquid as quickly and thoroughly as possible.

    3. Increase the energy of the liquid so that its particles move faster.

    4. Remove energy from the liquid so that its particles slow down.

Remove energy from the liquid so that its particles slow down.

200

  1. In the 1700s, a French chemist named Antoine Lavoisier discovered that the total mass of the products in a chemical reaction always equaled the total mass of the reactants, even when he supplied energy as heat to the reaction. Which law did Lavoisier’s work help to establish?

    1. The Law of Electric Charges

    2. The Law of Universal Gravitation

    3. The Law of the Conservation of Mass

    4. The Law of the Conservation of Energy

The Law of the Conservation of Mass

200

  1. The following statements were taken from the procedures of four different investigations.

The statement from which investigation is an example of repetition?

  1. Investigation 1

  2. Investigation 2

  3. Investigation 3

  4. Investigation 4

Investigation 4

300

  1. Look closely at the illustration below showing where the compound sodium hydroxide falls on the pH scale.

   

    What type of compound is sodium hydroxide?

  1. A base

  2. A salt

  3. An acid

  4. An element

A base

300

  1. According to atomic theory, atoms are composed of electrons surrounding a nucleus of protons and neutrons. Which of the following statements about atoms is correct?

    1. The total number of protons and neutrons in an atom is the same as its mass (in u).

    2. The number of neutrons in an atom determines its net charge.

    3. The total number of electrons and neutrons in an atom determines its atomic mass (in u).

    4. The total number of neutrons and electrons in an atom determines its net charge.

The total number of protons and neutrons in an atom is the same as its mass (in u)

300

  1. At room temperature, mercury metal exists as a liquid. In contrast, silver metal exists as a solid. Imagine that you had a sample of silver and a sample of mercury, both at room temperature. What can you predict about the two samples?

    1. Silver atoms move more freely compared to the movement of the mercury atoms.

    2. Mercury atoms have more kinetic energy than the silver atoms.

    3. Both silver atoms and mercury atoms move fast enough to overcome almost all the attractive forces between them.

    4. Both silver atoms and mercy atoms do not move from one location to another but simply vibrate while remaining in position.

Mercury atoms have more kinetic energy than the silver atoms.

300

  1. Temperature influences chemical changes. As the temperature of a gas decreases, which of the following occurs to the molecules in the gas?

    1. They collide more often.

    2. They collide with a greater velocity.

    3. They collide with less kinetic energy.

    4. They change shape from spheres to extended rods.

They collide with less kinetic energy.

300

  1. Experimental results must be replicable to be generally accepted as true. One reason replication is important is because it can reduce or eliminate bias by an individual scientist. What is a replicable experiment?

    1. When different scientists use the same procedures to obtain the same results

    2. When the same scientist repeats the same procedures and obtains the same results

    3. When the same scientist repeats the same procedure and obtain different results

    4. When different scientists use the same procedure and obtain different results

When different scientists use the same procedures to obtain the same results

400

 Students mix two substances together. The amounts of the starting materials are shown below. 

What is formed when these materials are combined? 

A. a homogeneous mixture

B. a compound

C. a heterogeneous mixture

a homogeneous mixture

400

Chlorine is a greenish-yellow corrosive gas at room temperature. A second element on the periodic table is a pale-yellow corrosive gas under the same conditions. Which element is most likely to be the second element and why?

A. aluminum, because it is in the same period as chlorine

B. fluorine, because it is in the same group as chlorine

C. bromine, because it about twice the mass of chlorine

D. argon, because it has a similar mass to chlorine

fluorine, because it is in the same group as chlorine

400

  1. The points labeled on the chart below represent the approximate size of Earth, the Milky Way, the Moon, and the Sun. The approximate size of the solar system is also shown.

       


        Which point on the chart best represents the approximate size of the Sun?

  1. W

  2. X

  3. Y

  4. Z

Y

400

  1. Objects in outer space include planets, stars, and galaxies. Which of the following objects is farthest from Earth?

    1. Andromeda Galaxy

    2. Neptune

    3. North Star

    4. Sun

Andromeda Galaxy

400

  1. Anna, Kate and Rachel are experimenting by dropping a rubber ball from certain heights. The following graph shows their results.

   

Mario replicates the experiment. His results are consistent with the existing results. How high would you expect a ball dropped by Mario to bounce it is released from a drop height of 20 centimeters (cm)?

  1. 10 cm

  2. 15 cm

  3. 35 cm

  4. 50 cm

10 cm

500

Substances that are formed during a chemical change are known as which of the following?

  1. Reactants
  2. Products
  3. Kelvin
  4. Energy
  • Products
500

Lithium (Li), Sodium (Na), Potassium (K), Rubidium (RB), Cesium (Cs), and Francium (Fr) are in the same column (group) in the periodic table. Why are these elements in the same group in the periodic table? 

A. They have similar properties.

B. They have atoms of the same size.

C. They have the same number of protons. 

D. They have the same number of neutrons. 

They have similar properties.

500

  1. The Andromeda Galaxy is the nearest spiral galaxy to the Milky Way Galaxy. Which unit would best be used to represent the distance between the Milky Way Galaxy and the Andromeda Galaxy?

    1. Astronomical unit

    2. Kilometer

    3. Light year

    4. Mile

Light year

500

Which of the following DOES NOT indicate a chemical change/reaction is occurring?


1.Color Change

2.Formation of a Precipitate

3. Formation of gas/bubbles

4. State of matter change


State of matter change

500

Trevor wanted to find out what fertilizer worked best for growing marigolds.  He put Miracle Grow on one, Scotts fertilizer on one, and no fertilizer on another. All marigolds were in the full light and received only natural forms of water. He measured the marigolds once a week for 4 weeks. 


Independent 

Dependent 

Constant 

Control










Independent : Type of fertilizer  

Dependent : growth of marigold 

Constant : Full light & natural forms of water 

Control: No fertilizer on one