Unit 2 Test Review (Matter)

Which subatomic particle has a positive electric charge?

• positron

• proton

• electron

• neutron

Tags

NGSS.MS-PS1-1

Which subatomic particle has a no electric charge (neutral)?

• positron

• proton

• electron

• neutron

Tags

NGSS.MS-PS1-1

What is the atomic mass of the atom pictured here?

• 6

• 1

• 7

• 3

Tags

NGSS.MS-PS1-1

What is the atomic number of the atom pictured here?

• 6

• 1

• 7

• 3

Tags

NGSS.MS-PS1-1

What can be found in the nucleus of an atom?

• protons and neutrons

• electrons and neutrons

• electrons and protons

• All of your missing socks.

Tags

NGSS.MS-PS1-1

Pictured here is a model of Carbon Dioxide. This is an example of

• an ion.

• a diatomic molecule.

• an atom.

• a compound.

Tags

NGSS.MS-PS1-1

A group of eighth-grade students is investigating how the color of a light source affects plant growth. They set up three identical plants in separate containers, providing each with the same soil and amount of water. Plant A receives natural sunlight, Plant B receives only red light from an LED lamp, and Plant C receives only blue light from another LED lamp. Over four weeks, the students measure the height of each plant and record the number of leaves.

After analyzing their data, the students find that the plants under the red and blue lights grew taller than the plant under natural sunlight. Based on this investigation, which of the following statements is a valid scientific conclusion?

• Because the red and blue light produced taller plants, future scientific experiments will always show that red and blue light are better for plant growth than natural sunlight.

• The experiment proves that red and blue light are the optimal light sources for all types of plants, as shown by the increase in height.

• The results suggest that red and blue light may enhance growth in this specific type of plant, but further investigations and replication would be needed to support or refine the findings.

• The students' findings are conclusive and cannot be challenged because the investigation was a well-documented experiment using the scientific method.

Tags

NGSS.MS-PS3-5

A team of eighth-grade science students wants to investigate how different types of fertilizer affect the growth of bean plants. They design an experiment with four groups:

• Group 1: Receives Fertilizer A.

• Group 2: Receives Fertilizer B.

• Group 3: Receives Fertilizer C.

• Group 4: Serves as a control group with no fertilizer.

Each group consists of five identical bean plants grown in separate pots under the same conditions. After three weeks, the students measure the height of each plant. They find that the plants in Group 2, which received Fertilizer B, grew the tallest.

The students are then instructed to improve their investigation to make their results more reliable and valid. Which of the following describes the best approach?

• They should have another team of students perform the exact same experiment to see if they get similar results.

• They should repeat their own experiment multiple times, with each group still consisting of five plants, and then average the results.

• They should combine all the plants into one large group and apply all three fertilizers at once to see which one works best.

• They should use only one plant per group instead of five, as this would make the experiment easier and quicker to complete.

Tags

NGSS.MS-PS1-2

The periodic table is ordered by the atomic number, which is the ...

• size of the element's nucleus.

• number of neutrons the element has.

• number of protons the element has.

Tags

NGSS.MS-PS1-1

Most elements on the periodic table are ...

• metals.

• metalloids.

• nonmetals.

Tags

NGSS.MS-PS1-1