Compounds, Mixtures, Substances

Question 1

What is a compound?

Answer 1

A compound is formed anytime atoms of two or more different elements are chemically bonded together

Question 2

What is a chemical reaction?

Answer 2

The making, breaking, or rearranging of the chemical bonds between atoms

Question 3

What are the atoms in compounds held together by?

Answer 3

Electrical attractions between the protons and electrons

Question 4

What is the force that mainly governs the way things behave in everyday life

Answer 4

The electromagnetic force

Question 5

What kind of substances are compounds

Answer 5

pure substances

Question 6

What is the chemical symbol for salt

Answer 6

NaCl

Question 7

Who was the first to propose that atoms always combine together in whole number ratios to form compounds.

Answer 7

John Dalton 1803

Question 8

What is the chemical formula

Answer 8

A chemical formula shows the ratio of atoms in the compound

Question 9

What are several examples ratios in compounds

Answer 9

NH3 1:3 hydrogen= Amonia
SO2 1:2 Sulfur Oxygen= Sulfur Oxide
C3H8 3:8 Carbon Hydrogen=Propane
CH4 1:4 carbon hydrogen=Methane
Mg(NO3)2 1:2:6 magnesium nitrogen oxygen=magnisium nitrate
CaCO3 1:1:3 calcium carbon oxygen= Calcium carbonate

Question 10

Are Mixtures pure substances

Answer 10

no

Question 11

How are mixtures formed

Answer 11

When substances combine but no chemical reaction occurs between the substances

Question 12

What are the two types of mixtures

Answer 12

Heterogeneous and homogeneous

Question 13

What is the difference between Heterogeneous and Homogeneous mixtures

Answer 13

Hetro= You can see the different components within the mixture fairly easily
Homo= The two substances appear to be uniform but plot twist they arent

Question 14

WHat is another name for homo mixtures

Answer 14

Solutions

Question 15

How is a solution formed

Answer 15

When one substance called a solute is desolved into another substance called a solvent

Question 16

The process of dissolving does not include what

Answer 16

A chemical reaction

Question 17

What is a charged atom called

Answer 17

an Ion

Question 18

What does dissociate mean and what does it usually apply to

Answer 18

To come apart and it is mostly assosiated with crystals

Question 19

What does a polar molecule mean

Answer 19

This means that there are one or more places in the molocule that are more positively charged and one or more places where it is negatively charged

Question 20

What do most electronic devices rely on to work

Answer 20

Crystalline semiconductors

Question 21

What is the term scientists use for adding another completely different element into the crystal semi conductor every 1/10000 times

Answer 21

Doping