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8th Grade Science Q1 Review

Authored by Clayton Woody

Chemistry

8th - 10th Grade

Used 139+ times

8th Grade Science Q1 Review
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30 questions

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1.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Media Image

The diagram above is a model of a molecule of methane. What is the formula for methane?

CH8
C8H4
CH4
C8H8

2.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

2Mg + O2 → 2MgO
In the equation above, how many atoms are in the oxygen molecule?

2
0
1
3

3.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

The formula below represents the most common carbohydrate known as Glucose. Glucose is synthesized by Chlorophyll in plants as they use carbon dioxide from the air and sunlight as an energy source during the process of photosynthesis.
C6H12O6
What information can be determined from the chemical formula?

The structural arrangement of the atoms in a glucose molecule.
The color of a glucose molecule.
The size of a glucose molecule.
The number of atoms of each element in a glucose molecule.

4.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Which of the following formulas contain the same number of oxygen atoms?
1. Mg(NO)2
2. NH4NO2
3. Ca(ClO2)2
4. Co(NO3)2

Formulas 1 and 2
Formulas 2 and 4
Formulas 1, 2, and 3
Formulas 1, 2, and 4

5.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

How many atoms are in one molecule of baking soda, NaHCO3?

4
5
3
6

6.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

A student placed 2 grams of baking soda in a balloon, and 100 mL of vinegar in a Erlyenmeyer flask. After stretching the balloon across the neck of the flask, the student raised it to drop the baking soda into the flask. He immediately observed foaming bubbles in the flask and the balloon began to expand. The student concluded that -

Only a physical change was occuring
The baking soda and vinegar were products of a chemical reaction
The gas was oxygen
The bubbles indicated that a chemical change was occuring

7.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

During an investigation, students dropped a tarnished penny into a solution a acetic acid and sodium chloride. Tiny bubbles formed around the penny, and the penny was less tarnished after two minutes of soaking in the acetic acid and sodium chloride solution. The student inferred that a chemical reaction occured. What evidence supports the students' inference?

The penny experienced a color change, and a gas was produced.
The penny experienced a color change, and a precipitate was formed.
The penny experienced a color change and is in a new state of matter.
The penny experienced a color change and produced light.

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