AnswersGA-GSE Grade 8 Physical ScienceUnit Test

Unit Test — Unit test Answers

25 verified answers
21
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Which condition must be met in order for an equation to be balanced?

A
The elements in the reactants are the same as the elements in the products.
B
There are fewer elements in the reactants than there are in the products.
C
The number of atoms in the reactants is greater than the number of atoms in the products.
D
The number of atoms in the reactants equals the number of atoms in the products.
22
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Which are the products in the equation CH3SH + 4O2 → CO2 + SO2 +2H2O? Check all that apply.

A
CH3SH
B
O2
C
CO2
D
SO2
E
H2O
23

To make a solution for an experiment, Gunther needs to add 40 g of a solute to 100 g of water. When making the solution at room temperature, he could only add 34 grams before the solute settled out.What could he do to dissolve the remaining 6 grams of the solute?

A
Put the solution in an ice bath, dissolve the solute, and let the solution return to room temperature.
B
Heat the solution, dissolve the solute, and let the solution cool verifying nothing settled out.
C
Add more water, boil the solution, and dissolve the solute until the some of the water evaporates.
D
Keep the solution at room temperature, add more water, and dissolve the excess solute.
24

Which would increase the rate of dissolving salt into water?

A
low temperature
B
little to no agitation
C
more surface area
D
darker colors
25

Thirty grams of lead oxide and fifteen grams of ammonia react completely to produce solid lead, nitrogen gas, and liquid water. What will be approximate mass of all three products?

A
10 g
B
15 g
C
45 g
D
450 g

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