MC

Chemistry

Standard: 01

Objective: 01. Recognize the origin and distribution of elements in the universe.

ILO:

 

 

When do electrons release photons?  When the electrons:

a.  move to higher levels of energy

b.  return to their original energy level

c   increase orbital speed around the nucleus

d.  are released by the atom

e.  explode

 

Correct Answer: b

 

MC

Chemistry

Standard: 01

Objective: 01. Recognize the origin and distribution of elements in the universe.

ILO:

 

 

Helium was discovered on the sun in 1868, almost 30 years before it was discovered here on the earth.  How could that be possible?

a.  Investigation of light from the sun revealed a spectrum not yet found in known elements.

            b.  Captured cosmic rays from the sun contained helium.

c.  Investigation of the size of solar flares suggested that they consisted of material twice the mass of hydrogen.

            d.  Meteorites that had traveled through the sunÍs atmosphere contained helium.

 

Correct Answer:  a

 

MC

Chemistry

Standard: 01

Objective: 01. Recognize the origin and distribution of elements in the universe.

ILO:

 

 

Solubility data for four different salts in water at 60ÁC are shown in the table below.

Salt

Solubility in Water at 60 ÁC

A

10 grams/50 mL H2O

B

20 grams/60 mL H2O

C

30 grams/120 mL H2O

D

40 grams/80 mL H2O

 

Which salt is the most soluble at 60 ÁC?

a.  A

b.  B

c.  C

d.  D

 

Correct Answer: d

 

MC

Chemistry

Standard: 01

Objective: 01. Recognize the origin and distribution of elements in the universe.

ILO:

 

 

The force of gravity is directly proportional to the mass of the objects being attracted.  More massive objects attract more strongly.  Less massive objects, that have a minimal amount of energy, can easily escape a weak gravitational force. Where would you expect to find a higher proportion of hydrogen compared to other atoms?

            a.  on the moon

            b.  on the earth

            c.  on Jupiter

            d.  on the sun

 

Correct Answer:  d

 

MC

Chemistry

Standard: 01

Objective: 01. Recognize the origin and distribution of elements in the universe.

ILO:

 

 

Assumptions arising from the ñBig Bangî theory suggest that the universe originally consisted of almost all hydrogen.  If that is correct, where did other elements, like those found on earth, come from?

            a.  fission (splitting) of heavy elements

            b.  fusion (joining) of light elements

            c.  chemical reactions between hydrogen atoms

            d.  diffusion from other parts of the universe

 

Correct Answer:  b