Grade 7 Science-Solution

1. Which is an example of a Solution?

• A. Cooked flour

• B. Marshmallow

• C. Sea Water

• D. Blood

1. The two components of a Solution are solute and solvent. Which statement describe the solute?

• A. It is the solid form in the solution

• B. It is the liquid component of the Solution

• C. It is the component in the Solution in smaller quantity

• D. It is the component in the Solution in bigger quantity

For items No. 3-5, Gabriel was tasked by his teacher to investigate on how fast table salt dissolove in cold and hot water.

3.Observing the fair testing, What will be his control variables?

• A. Amount of water and table salt in each cup. method of stirring, time when the solid is added to water, how long each solution is stirred

• B. Amount of water and table salt in each cup. method of stirring, how long each solution is stirred

• C. Amount of table salt in each cup. method of stirring, time when the solid is added to water, how long each solution is stirred

• D. Amount of water and table salt in each cup. method of stirring, time when the solid is added to water, how long each solution is stirred

4.Which variable is being measured by Gabriel?

I. The amount of table salt

II. The temperature of water

III. The time the table salt will completely dissolves in hot water

IV. The time the salt that completely dissolves in cold water

• A. I only

• B. II only

• C. III only

• D. II & IV

5.What is the independent variable in the investigation being conducted by Gabriel?

• A. Concentration of salt

• B. Lenght of time table salt dissolves

• C. Temperature of water

• D. Not given

6.Which of the following statements best describe a homogeneous solution?

• A. It is usually liquid

• B. It contains a solute and solvent

• C. It can be dilute or concentrated

• D. Its components are distributed evenly in the solution

7.In a Chemistry class, Gabby prepared a solution by mixing 25 g of sugar in 80 g of water. What are the concentations of solute and solvent in % by mass?

• A. Solute:34%, Solvent:60%

• B. Solute:14%, Solvent:86%

• C. Solute:24%, Solvent: 76%

• D. Solute:44%, Solvent:56%

8.A piece of jewelry is made up of 18 K it means that the jewelry is made up of __________.

• A. 18 parts is made up of copper and 6 parts is gold

• B. 18 parts is made up of gold and 6 part is copper

• C. 9 parts is made up of gold and 9 parts is made up of copper

• D. 18 parts of the jewelry is made up of finest gold suited for the purpose

Tags

NGSS.MS-PS1-1

9.Which of the these factors will cause more sugar to dissolve in a saturated sugar solution?

I. Add more sugar while stirring

II. Add more sugar and heat to the solution

III. Add more sugar and cool down the solution

• A. I only

• B. III only

• C. II only

• D. I & II only

Tags

NGSS.MS-PS1-4

10.What is the percentage concentration in the following solution: g sucrose in 90 grams water?

• A. 4%

• B. 5%

• C. 6%

• D. 7%