Year 8 Science

Chemistry #1

100

How are elements arranged on the periodic table? 

Based on their atomic number. 

200

What is the test for hydrogen gas? 

Squeaky pop test 

300

What does ductile mean? 

Can be drawn into a wire. 

400

What does lustrous mean? 

Shiny

500

Which set of results are repeatable? 

Set A: 20, 20, 21, 21, 22

Set B: 19, 30, 25, 26, 25

Set C: 19, 19, 22, 24, 26

Set A because we get similar results every time. 

Chemistry #2

100

Which group on the periodic table is unreactive? 

Noble Gas 

200

Where are most nonmetals found on the periodic table: on the right, left, or middle? 

Right of the periodic table. 

300

What is an example of a chemical property? 

- Calcium is very reactive with water. 

- Calcium has a high melting point. 

- Calcium is a blue compound. 

- Calcium cannot conduct electricity. 

Calcium is very reactive with water. 

400

Complete the word equation: 

potassium + water -->

Potassium + water --> potassium hydroxide + hydrogen.

500

Complete the word equation: 

calcium + oxygen --> 

Calcium + oxygen --> calcium oxide 

Chemistry #3

100

Predict the boiling point of the next metal > will it be lower or higher. From the top: 

Metal #1 = boiling point is 100 degrees Celsius 

Metal #2 = boiling point is 175 degrees Celsius 

Metal #3 = boiling point is 220 degrees Celsius 

Metal #4 = ?

Boiling point should be higher. 

200

Rusting of iron will weaken irons structure. Will this affect other metals? 

No, other metals are not affected when they react with oxygen. There structure is not weakened. 

300

Describe the difference in pH between sodium oxide and sulfur oxide. 

Sodium oxide = will have an alkaline pH (metal oxides tend to have alkaline pH). 

Sulfur oxide = will have acidic pH (nonmetal oxides tend to have acidic pH). 

*Metals are found on the left of the periodic table while nonmetals are found on the right of the periodic table. 

400

Complete the word equation: 

calcium + water -->

calcium + water --> calcium hydroxide + hydrogen.

500

Sodium and potassium are in the same group. Sodium and magnesium are in the same period. Is sodium more similar to potassium or magnesium? 

Sodium is more similar to potassium. 

*Elements in the same group are more similar than elements in the same period. 

Chemistry #4

100

What does reproducible mean? 

Another person can get the same results. 

200

Balance the equation: 

__N₂ + __ H₂ --> __ NH₃

N₂ + 3H₂ --> 2NH₃

300

Choose the anomalous result: 

2, 5, 6, 3, 2, 4, 12, 2, 4, 2, 1, 3

12

400

How to stop iron from rusting? 

Galvanizing, paint coating, oil coating, plastic coating, etc. 

500

What is the word equation for rusting? 

Iron + oxygen + water --> iron hydroxide 

Light

100

The angle of reflection is 40 degrees. So the angle of incidence will be? 

- The angel of incidence will also be 40 degrees. 

Angle of reflection = angle of incidence

200

What is it called when light changes speed and direction? 

Refraction 

300

What is the colored part of the eye called? What is the function? 

Iris - controls the size of the pupil

400

What is the role of the optic nerve? 

Optic nerve = carries messages from the eyes to the brain. 

500

Why are the primary colors of light: red, blue, and green? 

Because the cones in our eyes detect these colors. There are three cones in our eyes: red, blue, and green cone cells.