Physical Science 2nd 9 Weeks PRACTICE TEST

Jadon plans on carrying out an experiment involving the burning of steel wool to illustrate the conservation of mass. Steel wool is made of iron. When it is burned it combine with oxygen to form iron (III) oxide. Which step in his experiment is the MOST important if he wants his experiment to correctly demonstrate the conservation of mass?

• The steel wool should be burned inside of a sealed jar or other closed system.

• The steel wool should be burned over a long period of time (at least two hours).

• the steel wool should be burned in a room that is at room temperature (20 - 25 degrees Celsius).

• The steel wool should be burned in its entirety so that no iron is left in its original state.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Look at the following equation. __Au₂O₃ --> __Au + __O₂

In order to follow the law of conservation of mass, this equation must have which set of coefficients, in order from left to right?

• 2, 4, 3

• 1, 3, 1

• 2, 1, 3

• 1, 1, 3

Tags

NGSS.MS-PS1-5

Look at the following equation: 8Ag₂S --> 10Ag + S₈

What is true about this chemical equation?

• It is balanced because the products contain the same number of sulfur (S) atoms as the reactants.

• It is unbalanced because the products contain fewer silver (Ag) atoms than the reactants.

• It is balanced because the mass of the reactants is equal to the mass of the products.

• It is unbalanced because the number of reactants is less than the number of products.

Tags

NGSS.MS-PS1-5

Increasing the amount of solute in a solution also increases

• the rate of solubility

• the total amount of solution

• the conductivity of the solution

• the temperature of the solution

A student is trying to determine the phases of matter of two unknown substances. Which question can the student ask to determine which sample is in the the solid phase?

• Which sample contains molecules that are sliding past one another?

• Which sample contains molecules that have a high amount of energy?

• Which sample contains molecules that are in an orderly arrangement?

• Which sample contains molecules that are far apart and quickly moving?

Tags

NGSS.MS-PS1-4

What do gas solutes all have in common?

• As you heat them up, they increase in solubility.

• As you cool them off they decrease in solubility

• As you heat them up, they decrease in solubility.

• You cannot dissolve gases.

Tags

NGSS.MS-PS1-4

How many grams of NaCl will saturate a 200 g solution at 10 degrees Celsius?

• 38 grams

• 50 grams

• 84 grams

• 76 grams

You have 130 grams of NaNO₃ at 70 degrees Celsius. What type of solution do you have?

• saturated

• unsaturated

• supersaturated

• dilute

Brett has an unknown substance that he wants to figure out the pH of. When he put the substance in tumeric water, it turns red, and when he puts a drop of it on to blue litmus paper, it remains blue. What type of solution did Brett most likely find?

• acid

• base

• water

• salt

Sequence the images above based on particle motion high to low.

• 4, 1, 2, 3

• 1, 4, 2, 3

• 3, 2, 1, 4

• 1, 2, 3, 4

Tags

NGSS.MS-PS1-4