Quiz about 8th Grade - Final Exam Practice - Science

Question 1

Use the periodic table provided to answer the following question:

Which of the following choices identifies a group on the periodic table with one electron available for bonding?

Accepted Answer

a

Answer

b

Answer

c

Answer

d

Question 2

Use the periodic table provided to answer the following question:

Which of the following choices identifies a group on the periodic table with zero electrons available for bonding?

Accepted Answer

d

Answer

a

Answer

b

Answer

c

Question 3

Use the periodic table provided to answer the following question:

Based on what you know about the periodic table, element 19 (K - potassium) must be a...

Accepted Answer

metal

Answer

metalloid

Answer

nonmetal

Answer

noble gas

Question 4

All of the following actions will increase the rate at which a cube of sugar dissolves in water except...

Accepted Answer

adding more cubes of sugar to the water

Answer

crushing the cube into smaller pieces

Answer

heating the water

Answer

stirring the water

Question 5

Shown is a table of observations made about a certain element. Based on the information in the table, it can be determined that the element is a...

Accepted Answer

metal

Answer

nonmetal

Answer

metalloid

Answer

liquid

Question 6

The diagram shows a partially filled 10 mL graduated cylinder. The cylinder and liquid together have a mass of 13 grams. If the empty graduated cylinder has a mass of 4 grams, what is the density of the liquid?

Accepted Answer

1.29 g/mL

Answer

0.78 mL/g

Answer

0.90 mL/g

Answer

1.85 g/mL

Question 7

Elements in the same group of the periodic table tend to have similar reactivities because they have the same number of...

Accepted Answer

electrons in their highest occupied energy level

Answer

electrons

Answer

protons

Answer

protons and neutrons in their nuclei

Question 8

When sodium and sulfur bond, how many sodium atoms bond with each sulfur atom?

Accepted Answer

2

Answer

1

Answer

4

Answer

6

Question 9

The noble gasses form very few compounds because they...

Accepted Answer

have stable electron arrangements

Answer

are gases

Answer

are radioactive

Answer

do not have electronegativity values

Question 10

The image represents a bond forming between an atom of lithium and an atom of fluorine.

What type of bond is formed between atoms of lithium and fluorine? (HINT: lithium is a metal and fluorine is a nonmetal)

Accepted Answer

ionic

Answer

covalent

Answer

polar covalent

Answer

metallic

Question 11

A scientific experiment is performed testing the effect of pH changes on brine shrimp survival. Data from the experiment is presented in the graph.

Based on the data in the graph, which of the following statements is an accurate conclusion?

Accepted Answer

Brine shrimp survival is greatest in a slightly basic environment.

Answer

Brine shrimp survival is greatest in an acidic environment.

Answer

Brine shrimp survival is greatest in a neutral basic environment.

Answer

Brine shrimp survival increases as the pH of the environment increases.

Question 12

The diagram shows the formation of a water molecule. The bonds between the elements are formed by...

(HINT: oxygen and hydrogen atoms are nonmetals)

Accepted Answer

sharing electrons

Answer

sharing elements

Answer

ionic attraction

Answer

electrostatic attraction

Question 13

When red food coloring has been added to water which has been left out in the Sun, it spreads out quickly. Which statement represents a conclusion supported by this observation?

Accepted Answer

Molecules in warm water move faster than molecules in cold water.

Answer

Molecules in cold water move faster than molecules in warm water.

Answer

Red food coloring molecules are more energetic than other food coloring molecules in water.

Answer

The motion of red food coloring molecules is easier to observe than other food coloring molecules.

Question 14

The zigzag line shown on the periodic table diagram separates which of the following regions?

Accepted Answer

metals and nonmetals

Answer

inert gases and nonmetals

Answer

inert gases and halogens

Answer

metals and actinides

Question 15

Which diagram would you use if you wanted to show a sixth grade student how atoms and molecules are arranged in a solid?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 16

A car travels at an average speed of 90 km/hr for 2 hours. Calculate how far the car travels.

Accepted Answer

180 kilometers

Answer

180 miles

Answer

45 miles

Answer

45 kilometers

Question 17

What is the average velocity of a car that travels 500 km in 5 hrs?

Accepted Answer

100 km/hr

Answer

0.1 km/hr

Answer

27.7 km/hr

Answer

2500 km/hr

Question 18

Which of these animals in the chart has the fastest average speed?

Accepted Answer

mouse

Answer

hawk

Answer

deer

Answer

snake

Question 19

The data table above gives the time and distance for a cycling trip, split up into four different segments. What was the average speed for the entire cycling trip (segments A-D)?

Accepted Answer

34.8 km/hr

Answer

0.029 km/hr

Answer

21.75 km/hr

Answer

32 km/hr

Question 20

The graph displays the distance and time of a honeybee's flight.

In which area did the honeybee travel the fastest?

Accepted Answer

between B and C

Answer

between A and B

Answer

between C and D

Answer

between E and F

Question 21

Because of the forces acting upon it, the box in the diagram will...

Accepted Answer

move to the right

Answer

not be moved or affected by the forces

Answer

move to the left

Answer

be forced up

Question 22

A small car and a large truck are accelerating at the same speed. This means that the force acting on the truck is...

Accepted Answer

greater than the force acting upon the car

Answer

the same as the force acting upon the car

Answer

smaller than the force acting upon the car

Answer

causing the truck to change its velocity more quickly

Question 23

Which statement represents the correct relationship between force, mass, and motion?

Accepted Answer

The greater the mass of an object, the more force is needed to achieve the same rate of change in motion.

Answer

The less mass an object has, no force will be needed to achieve the same rate of change in motion.

Answer

The less mass an object has, the more force is needed to achieve the same rate of change in motion.

Answer

The greater the mass of an object, the less force is needed to achieve the same rate of change in motion.

Question 24

The gravitational force between two planets depends on...

Accepted Answer

the mass of the planets and the distance between them

Answer

the mass of the planets and the direction of their orbits

Answer

the mass of the planets only

Answer

the distance between the planets and the direction of their orbits

Question 25

The Sun provides a great deal of energy to the solar system. Which of the following is the most accurate description of the transformation of energy that takes place in the Sun?

Accepted Answer

Nuclear energy is converted into heat and light energy.

Answer

Chemical energy is converted to heat and light energy.

Answer

Chemical energy is converted into mechanical energy.

Answer

Nuclear energy is converted into chemical energy.

Question 26

Two compounds are being combined: C₆H₁₂O₆ and 6O₂. How many atoms should be present in the products?

Accepted Answer

36

Answer

2

Answer

24

Answer

26

Question 27

How much acceleration is needed to move a 0.3 kg snowball with a force of 4.5 N?

Accepted Answer

$$15\ \frac{m}{s^2}$$

Answer

$$0.7\ \frac{m}{s^2}$$

Answer

$$1.35\ \frac{m}{s^2}$$

Answer

$$1.5\ \frac{m}{s^2}$$

Question 28

An object such as a hammer weighs less on the Moon than on Earth. This is because the Moon has a...

Accepted Answer

lower mass than Earth.

Answer

thinner atmosphere than Earth.

Answer

smaller diameter than Earth.

Answer

stronger magnetic field than Earth.

Question 29

Jorge calculated the gravitational potential energy of the objects shown in the illustration.

Which statement is supported by the calculated data on the table?

Accepted Answer

As the height of an object is increased, its gravitational potential energy also increases.

Answer

The gravitational potential energy of an object is not dependent on its mass.

Answer

The gravitational energy of an object is inversely proportional to its height above the ground.

Answer

As the weight of an object is increased, its gravitational potential energy decreases.

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