Robert goes outside and takes notes on the behaviors of squirrels in the park at the same time each day for 7 days. After he finishes, Jim does the same experiment the following week and the two share notes. In what ways was the experiment of observing squirrel behaviors repeated and replicated by Robert and Jim?

Robert repeated multiple trials over 7 days. Jim replicated Robert's experiment.

Robert and Jim observed different animals.

Robert and Jim observed squirrels at different times.

Robert and Jim observed squirrels in different locations.

Why would a scientist prefer to conduct certain investigations in a laboratory?

To have a controlled environment

Why is it important for a hypothesis to be testable?

To ensure it can be proven or disproven through experimentation

To make it easier to write scientific papers

To allow for more complex theories to be developed

To ensure it aligns with existing scientific beliefs

What is the difference between repetition and replication?

Repetition involves repeating the same experiment multiple times, while replication involves conducting the experiment by different researchers or in different settings.

Repetition and replication are the same and involve repeating the same experiment multiple times.

Repetition involves conducting the experiment by different researchers, while replication involves repeating the same experiment multiple times.

Repetition and replication both involve conducting the experiment by different researchers.

Which type of experiment would involve using both qualitative and quantitative data?

A survey with open-ended and multiple-choice questions

A chemical reaction observation

You want to conduct an experiment to see how long it takes for different types of apples to turn brown once you cut them. What is a variable that should remain constant in an experiment to see how long it takes for different types of apple to turn brown once you cut them?

Time of day the experiment is conducted

Why are peer-reviewed papers based on scientific investigations considered more trustworthy than ones that are not?

They are reviewed by experts in the field before publication.

They are published in more prestigious journals.

They are longer and more detailed.

They are more frequently cited.

Before you create a hypothesis, what should you do?

Think about a problem or question about the world around you.

Describe how the particle motion in solids and liquids are similar and describe how they are different.

The particles in both are always in motion, but in solids they have a fixed arrangement and in liquids they move freely past each other.

The particles in a solid are not in motion, and the particles in a liquid move freely past each other.

The particles in both are not in motion.

The particles in both are always in motion, but in liquids they have a fixed arrangement and in solids they move freely past each other.

How does condensation differ from evaporation? Describe how they differ in regards to thermal energy.

Condensation releases thermal energy, while evaporation absorbs it.

Condensation absorbs thermal energy, while evaporation releases it.

Both processes release thermal energy.

Both processes absorb thermal energy.

What are the two types of vaporization and what is the main difference between the two?

Evaporation and boiling; evaporation occurs at the surface and boiling occurs throughout the liquid

Condensation and sublimation; condensation is a gas to liquid transition and sublimation is solid to gas

Melting and freezing; melting is solid to liquid and freezing is liquid to solid

Sublimation and deposition; sublimation is solid to gas and deposition is gas to solid

Describe the difference between melting and freezing in regards to thermal energy.

Melting involves the absorption of thermal energy, while freezing involves the release of thermal energy.

Melting involves the release of thermal energy, while freezing involves the absorption of thermal energy.

Both melting and freezing involve the absorption of thermal energy.

Both melting and freezing involve the release of thermal energy.

Polar ice caps are melting in the arctic. In terms of thermal energy and change in state, what is happening to the ice caps?

The ice caps are gaining thermal energy and changing from solid to liquid state.

The ice caps are losing thermal energy and changing from liquid to solid state.

The ice caps are gaining thermal energy and changing from liquid to gas state.

The ice caps are losing thermal energy and changing from gas to liquid state.

What occurs during condensation in this diagram of the water cycle?

The water vapor evaporates from the surface and changes state to liquid in order to form clouds.

Liquid water freezes and falls to Earth as snow.

Water vapor falls to the Earth as fog.

What is the difference between the kinetic energy of the particles in milk versus a milkshake?

The particles in the milk move faster and have more kinetic energy than the particles in the milkshake because the milk has more thermal energy.

The kinetic energy of particles in a milkshake is higher than in milk.

There is no difference in the kinetic energy of particles in milk and a milkshake.

The kinetic energy of particles in milk and a milkshake depends on temperature.

How could you prove to someone that air is matter?

Weigh an empty balloon, then fill it with air and weigh it again and compare the two.

By explaining that air is invisible

By demonstrating that air is essential for breathing

Find the volume of each: 1. Density = 13.8 g/mL Mass = 27 g 2. Density = 22.7 g/mL Mass = 59 g 3. Density = 5.3 g/mL Mass = 21.6 g

1) 1.96 mL; 2) 2.6 mL; 3) 4.07 mL

1) 2.6 mL; 2) 1.96 mL; 3) 4.07 mL

1) 1.96 mL; 2) 4.07 mL; 3) 2.6 mL

1) 4.07 mL; 2) 2.6 mL; 3) 1.96 mL

How can an object’s weight change but the object’s mass stay the same?

A bowling ball weighs 9 lbs on Earth, but only 1.5 lbs on the moon, but its mass does not change.

The object is heated, causing its mass to change.

The object is compressed, altering its mass.

The object is split into smaller parts, changing its mass.

The mass of an object per unit volume

The amount of space an object occupies

The volume of an object per unit mass

People often shake snow globes in order to see them work because the particles sink to the bottom. Why does this happen?

The particles are denser than the liquid inside the globe.

The particles are lighter than the liquid inside the globe.

The particles are magnetic and attracted to the base.

The particles dissolve in the liquid over time.

How do measuring the densities of a regular shape and an irregular shape differ?

By using different methods for finding volume

By using different units of measurement

By using different types of scales

By using different types of liquids for displacement

How does measuring the density of a liquid differ from measuring the density of a solid?

Solids can be measured with a ruler, formula, or water displacement. Liquid volume requires a tool such as a graduated cylinder to measure.

By using a thermometer for liquids and a ruler for solids

By using a barometer for liquids and a scale for solids

By using a hygrometer for liquids and a caliper for solids

Oil spills can be devastating to our marine ecosystems. Oil floats on water. This makes clean up easier than it would be if they were to mix. Why does it float?

Because oil is less dense than water

Because oil is denser than water

Because oil and water have the same density

Because oil is heavier than water

What are the steps involved in finding the density of a substance?

Measure the mass and volume of the substance, then divide mass by volume.

Measure the temperature and pressure of the substance, then divide temperature by pressure.

Measure the color and texture of the substance, then divide color by texture.

Measure the weight and height of the substance, then divide weight by height.

Find the Density of each: 1. Mass = 20 g Volume= 15 mL 2. Mass = 50 g Volume = 19 mL 3. Mass = 25.6 g Volume = 68 mL

1) 1.333 g/mL; 2) 2.631 g/mL; 3) 0.376 g/mL

1) 1.333 g/mL; 2) 0.376 g/mL; 3) 2.631 g/mL

1) 0.376 g/mL; 2) 1.333 g/mL; 3) 2.631 g/mL

1) 2.631 g/mL; 2) 1.333 g/mL;3) 0.376 g/mL

Which of the following best describes the similarities and differences between these two substances?

Box B has a higher mass than Box A. Both have the same volume, so B has a higher density.

Box B has a higher mass and volume than Box A, so B has a higher density.

Box A has a higher mass and volume than Box B, so A has a higher density.

Box B and Box A have the same mass and volume, so they have the same density.

Find the volume of each: 1. Density = 13.8 g/mL Mass = 27 g 2. Density = 22.7 g/mL Mass = 59 g 3. Density = 5.3 g/mL Mass = 21.6 g

1) 1.95 mL; 2) 2.6 mL; 3) 4.07 mL

1) 1.95 mL; 2) 4.07 mL; 3) 2.6 mL

1) 4.07 mL; 2) 2.6 mL; 3) 1.95 mL

1) 2.6 mL; 2) 1.95 mL; 3) 4.07 mL

Why do scientists find the periodic table to be a useful tool?

It organizes elements by increasing atomic number and similar chemical properties.

It provides a list of all known chemical reactions.

It is a historical document of element discovery.

It is used to predict weather patterns.

Explain the relationship that exists between atoms and elements.

Each element is a different type of atom. An element can be identified by how many protons it has in its nucleus, which is unique to each element.

Elements are the smallest units of atoms, which are pure substances consisting of only one type of element.

Atoms and elements are unrelated concepts in chemistry.

Elements are made up of different types of atoms combined together.

What are the charges and the masses of electrons, protons, and neutrons?

Electrons have a negative charge and negligible mass, protons have a positive charge and a mass of approximately 1 atomic mass unit, and neutrons have no charge and a mass similar to protons.

Electrons have a positive charge and a mass of approximately 1 atomic mass unit, protons have a negative charge and negligible mass, and neutrons have no charge and a mass similar to electrons.

Electrons have no charge and a mass similar to protons, protons have a positive charge and negligible mass, and neutrons have a negative charge and a mass of approximately 1 atomic mass unit.

Electrons have a negative charge and a mass similar to protons, protons have no charge and a mass of approximately 1 atomic mass unit, and neutrons have a positive charge and negligible mass.

Which two of these elements share chemical properties? How do you know?

Fe and Ru because they are in the same group.

Fe and Mn because the atomic numbers are in numerical order.

Xe and P because they are both gases.

Ca and Fe because they are in the same period.

1st Semester Exam Review

Authored by Eartha McGoldrick

Science

8th Grade

NGSS covered

Used 49+ times

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61 questions

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MULTIPLE CHOICE QUESTION

3 mins • 1 pt

What is the difference between an experiment and an observation?

An experiment involves manipulating variables, while an observation involves watching and recording without interference.

An experiment is always conducted in a laboratory, while an observation is done in natural settings.

An experiment requires a hypothesis, while an observation does not.

An experiment is qualitative, while an observation is quantitative.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Create a hypothesis for the following question: What will happen if I mix baking soda and vinegar together?

It will form a solid substance.

It will change color.

It will produce a gas.

If I mix baking soda and vinegar together, then carbon dioxide will be produced.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

In an experiment to test how fast a toy car will roll down a ramp at different heights, what are the independent and dependent variables?

Independent variable: Height of the ramp; Dependent variable: Speed of the toy car

Independent variable: Speed of the toy car; Dependent variable: Height of the ramp

Independent variable: Weight of the toy car; Dependent variable: Height of the ramp

Independent variable: Surface of the ramp; Dependent variable: Speed of the toy car

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

You generate a hypothesis that if you create a boat using aluminum foil, it will be able to hold 200 pennies while floating in the water. What conclusion could you draw from the experiment where your aluminum foil boat sank after adding 53 pennies?

The hypothesis was correct; the boat can hold 200 pennies.

The hypothesis was incorrect; the boat cannot hold 200 pennies.

The boat can hold more than 200 pennies.

The boat can hold exactly 53 pennies.

Tags

NGSS.MS-ETS1-1

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Silvia conducted an experiment in a laboratory and reports a new discovery relating to a new vaccine that can provide humans with immunity to an infectious disease. Other scientists are unable to reproduce the results of this experiment. How could this happen?

Silvia made an error in her experiment.

The results are not valid.

The other scientists are not skilled enough.

The vaccine is not effective.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

A scientist conducted an experiment 25 years ago and has since collected new data that led to a new conclusion. Does this mean that the scientist’s original conclusion was wrong?

Yes, the original conclusion was wrong.

No, the original conclusion was based on the data available at the time.

It depends on the nature of the new data.

The original conclusion is irrelevant now.

Tags

NGSS.MS-LS4-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

After a scientist collects data and inputs it into a chart or graph, what should the next step in the scientific investigation be?

Analyze and interpret the data.

Make a hypothesis

Observe & record results

Share results.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS2-5

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1st Semester Exam Review

What is the difference between an experiment and an observation?

Create a hypothesis for the following question: What will happen if I mix baking soda and vinegar together?

In an experiment to test how fast a toy car will roll down a ramp at different heights, what are the independent and dependent variables?

You generate a hypothesis that if you create a boat using aluminum foil, it will be able to hold 200 pennies while floating in the water. What conclusion could you draw from the experiment where your aluminum foil boat sank after adding 53 pennies?

Silvia conducted an experiment in a laboratory and reports a new discovery relating to a new vaccine that can provide humans with immunity to an infectious disease. Other scientists are unable to reproduce the results of this experiment. How could this happen?

A scientist conducted an experiment 25 years ago and has since collected new data that led to a new conclusion. Does this mean that the scientist’s original conclusion was wrong?

After a scientist collects data and inputs it into a chart or graph, what should the next step in the scientific investigation be?

True or false: There is only one way to conduct a scientific investigation.

Why would a scientist prefer to conduct certain investigations in a laboratory?

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