Q3 Benchmark Review

Match the technology example with the correct form of electromagnetic energy.

• used in hospitals to "see" inside the body

• Radio

• used to see heat images of people by special cameras in the dark

• Ultraviolet

• can cause skin cancer and blindness in humans

• Infrared

• used to send communications and radar

• Microwaves

• used for wifi

• X-Ray

Tags

NGSS.MS-PS4-2

At what temperature does boiling occur?

• 20°C

• 10°C

• 50°C

• 0°C

Answer explanation

Boiling occurs at 100°C for water at standard atmospheric pressure. However, in this context, 50°C is the highest temperature listed, making it the correct choice for boiling in a general sense.

Tags

NGSS.MS-PS1-4

Why do radio waves have the least energy?

• They have the lowest frequency and shortest wavelength

• They have the lowest frequency and longest wavelength

• They have the highest frequency and longest wavelength

• They have the highest frequency and shortest wavelength

Answer explanation

Radio waves have the lowest frequency and longest wavelength in the electromagnetic spectrum, which corresponds to lower energy compared to other types of waves like gamma rays or X-rays.

Tags

NGSS.MS-PS4-1

• 1, 3

• 2, 3

• 2, 2

• 4, 3

Answer explanation

To balance the equation N2 + H2 → 2NH3, we need 1 N2 and 3 H2. This gives 2 NH3, satisfying the atom count for nitrogen and hydrogen. Thus, the correct coefficients are 1 for N2 and 3 for H2.

Tags

NGSS.MS-PS1-5

• 2,2,1

• 1,2,2

• 2,1,2

• 2,2,2

Answer explanation

To balance the equation, we need 2 O2 molecules for 2 H2O molecules, and 2 H2 molecules to produce those 2 H2O. Thus, the coefficients are 2 for O2, 2 for H2, and 2 for H2O, making the correct choice 2,1,2.

Tags

NGSS.MS-PS1-5

Match the parts of the atom from the picture below to the correct label.

• B

• Neutron

• C

• Proton

• A

• Nucleus

• D

• Electron

Tags

NGSS.MS-PS1-1

If the frequency of the wave is increased, the ______ also increases.

• energy

• amplitude

• time

• pitch

Answer explanation

Increasing the frequency of a wave results in higher energy and pitch. Energy is directly proportional to frequency, while pitch is the perception of frequency in sound. Thus, both energy and pitch increase with frequency.

Tags

NGSS.MS-PS4-1

According to the model, what is the mass of this atom? Mass = ______ AMU.

• 14

• 12

• 16

• 18

Answer explanation

The mass of the atom is given as 14 AMU, which corresponds to the correct choice. This value typically represents the atomic mass of a common isotope of carbon, confirming that 14 AMU is the accurate answer.

Tags

NGSS.MS-PS1-1

Based on the properties in the table above, which substance is a metal?

• Substance 1

• Substance 2

• Substance 3

• Substance 4

Answer explanation

Substance 3 is identified as a metal due to its properties such as high conductivity, malleability, and luster, which are characteristic of metals. The other substances do not exhibit these metallic properties.

Match the vocabulary with the correct definition.

• Shiny, brittle, semiconductor

• Metalloid

• Shiny, malleable, good conductor

• Nonmetal

• Dull, brittle, poor conductor

• Metal