Friday Quiz 2

Which of the following determines the identity of the element? (if you know this, then you can find out which element it is)

• The number of protons

• The mass

• The number of neutrons

• The number of electrons

Answer explanation

the mass can be different, even with the same element. For example, Carbon usually has a mass of about 12 amu, but there are carbons with a mass of 13 and even 14 amu. Electrons usually equal the protons, but electrons can be gained or lossed by an atom (ions)

Which is FALSE about the nucleus? Click all that apply

• It is the location of electrons

• It is where the mass of the atom is found

• It has an overall positive charge

• It can have a neutral charge

How many neutrons does calcium have?

• 20

• 40

• 60

• 0

Tags

NGSS.HS-PS1-8

In order for two elements to be isotopes, what has to be the SAME?

• Protons

• Electrons

• Neutrons

• Mass

Which isotope of Lithium contains 4 neutrons?

• Li-6

• Li-7

• Li-8

• They have the same # of neutrons

Tags

NGSS.MS-PS1-1

Nitrogen has two isotopes. One isotope has a mass of 14.003 amu and a relative abundance of 99.63%, while the other has a mass of 15.000 amu and a relative abundance of 0.37%. What is the average atomic mass for nitrogen?

• 14.993 amu

• 14.456 amu

• 14.778 amu

• 14.007 amu

Which answer choice correctly outlines the differences between pure substances and mixtures?

• pure substances cannot be separated physically while mixtures can be separated physically.

• pure substances can be separated physically while mixtures cannot be separated physically

• pure substances and mixtures both can be separated physically.

• Neither pure substances and mixtures cannot be separated physically.

Chicken noodle soup is an example of a

• homogeneous mixture
• heterogeneous mixture

A solid changing to a gas is called:

• deposition

• sublimation

• condensation

• evaporation

What method would you use to separate a mixture of salt and water so that you can get keep the salt AND the water?

• sorting by hand

• distillation

• chromatography