Mid-Unit Quiz IPC

A scientist has a sample of an unknown gas. In order to identify it, they shine a continuous spectrum of white light through the gas and observes which wavelengths of light are absorbed by it. This is shown in the figure, as well as the absorption spectra of five pure, gaseous elements. Which of the five elements is the unknown gas?

• xenon

• oxygen

• helium

• neon

• argon

Tags

NGSS.HS-PS1-1

A scientist has a sample of an unknown gas. In order to identify the gas, they look at the spectrum of visible light emitted from it when it is heated. This is shown in the figure. Also shown in the figure are the emission spectra of five pure, gaseous elements. Which of the five elements is the unknown gas?

• helium

• neon

• xenon

• oxygen

• argon

Tags

NGSS.HS-PS4-3

NGSS.HS-PS1-1

A scientist has a sample of an unknown gas. In order to identify the gas, they look at the spectrum of visible light emitted from it when it is heated. This is shown in the figure. Also shown in the figure are the emission spectra of three pure, gaseous elements. Which of the three elements is the unknown gas?

• helium

• hydrogen

• oxygen

Tags

NGSS.HS-PS4-3

NGSS.HS-PS1-2

An astronomer looks at the spectrum of light from a distant star. Between Earth and the star is a large cloud of dust and gas. The star emits continuous-spectrum white light, but some of the light is absorbed by the cloud. The figure shows the spectrum of light that the astronomer observes as well as the absorption spectra of several pure elements. Which of the five elements shown does the interstellar cloud contain?

• hydrogen and helium

• hydrogen and oxygen

• hydrogen, helium, and nitrogen

• oxygen and nitrogen

Tags

NGSS.HS-ESS1-2

An astronomer looks at the spectrum of light from a distant star. The spectrum they see is shown in the figure. They compare the emission lines within the spectrum to the emission lines in the spectra of pure elements, which are also shown in the figure, in order to identify which elements are present in the outer layers of the star. State all of the elements that are present in the outer layers of the star.

• hydrogen, helium, and carbon

• hydrogen, helium, and boron

• helium, oxygen , and carbon

• hydrogen, helium, boron, and carbon

Tags

NGSS.HS-ESS1-2

NGSS.HS-ESS1-3

A scientist has a gas canister that contains a mixture of unknown gases. In order to identify which gases are in the mixture, they look at the spectrum of visible light emitted from it when it is heated. This is shown in the figure. Also shown in the figure are the emission spectra of several pure, gaseous elements. Which of the five elements does the mixture contain?

• helium, oxygen, nitrogen, and argon

• oxygen, hydrogen, and nitrogen

• hydrogen, helium, and nitrogen

• hydrogen and argon

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Why do the spectra of individual elements only have certain bands of colors?

• they don't have enough electrons

• not all of the electrons are changing energy levels

• electrons are only allowed to have certain energies

• some electrons are moving up levels while some are moving down

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4

Atoms emit light when...

• electrons move down to lower energy levels

• electrons move up to higher energy levels

• electrons move in circular orbits around the nucleus

• electrons crash into the nucleus

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4

Which experimental results support the theory that electrons exist in discrete energy levels?

• H NMR

• X-Ray diffraction patterns

• Emission spectra

• Infrared spectra

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4

What causes an electron to leave its ground state and jump to an excited state?

• Absorption of a photon

• emission of a photon

• absorption of an electron

• Emission of an electron

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4