Chemistry Final

How many valence electrons are needed to fulfill a full outer shell?

8

Entropy is a measure of randomness or disorder. Between a cold piece of solid iron and a hot piece of solid iron which one has more entropy?

Hot, Because the particles are moving around faster

What is the scientific notation for 3.0024 x 10^-6

0.0000030024

Which type of system allows for energy, but not matter to transfer in or out.

Open, Closed, or Isolated

Closed, It can only exchange energy only energy with its surroundings, not matter.

Which particle is responsible for the atomic number of an element

Protons, The atomic number will match the number of protons.

How much mass and charge do neutrons have?

Mass 1, Charge 0

Which type of system does not allow for energy or matter to transfer in or out?

Isolated

What is the difference between a compound and mixture

Compounds are substances which can be formed by chemically combining two or more elements. Mixtures are substances that are formed by physically mixing two or more substances

An element has an atomic # of 30 and a mass # of 65 and a +1 charge.  List the number of protons, neutrons, & electrons below:

Zinc⁺¹- 65     p⁺  =  _________ n⁰  =  _________ e ^–  =  _________

p⁺  = 30 n⁰  =35 e ^–  =29

Which point is where solid, liquid, and gas all exist?

A

B

C

A yay

How many Kilograms are 36500 grams?

36.5 Kilograms, because 1 Kilogram equals 1000 grams.

What is a compound? 

a pure substance made of two or more elements that are chemically bonded

What is the formula for calculating density?

Density = mass/volume.

How does the boiling point of a liquid change as atmospheric pressure decreases

A. It increases

B. It decreases

B, Less “pushing down” of pressure so it requires less temp to boil