Unit 2

Question 1

Is Ca+2 an atom or an ion?

Answer 1

Ion

Question 2

Positively charged ions have (an excess,a defiance you of electrons they are called (cations,anions)?

Answer 2

Deficiency cations

Question 3

The new system formed in a chemical reaction (right of arrow)?

Answer 3

Products

Question 4

02 represents (an atom,or molecule)?

Answer 4

Molecule

Question 5

A substance composed of one type of atom

Answer 5

Element

Question 6

A one or two letter expression to represent an element

Answer 6

Symbol

Question 7

The combination of chemical formula that represents what occurs in a chemical reaction?

Answer 7

Reactants

Question 8

A substance composed of an anion and Cation

Answer 8

Ionic compound

Question 9

The physical property of water that would allow us to float a paper clip on the surface of beaker?

Answer 9

Surface Tention

Question 10

Water freeze at this temperature

Answer 10

0*c

Question 11

List characteristics of pure water

Answer 11

Clear,colorless,tasteless

Question 12

A mixture that APPEARS uniform throughout is said to be?

Answer 12

Homogeneous

Question 13

A mixture which does NOT appear uniform thought out is said to be?

Answer 13

Heterogeneous

Question 14

The smallest particle of unit that possesses the property of an element and is the building block of matter

Answer 14

Atom

Question 15

A substance composed of atoms of 2 or more elements linked together chemically in fixed proportions

Answer 15

Compound

Question 16

The smallest unit of compound that retains the properties of theta substance

Answer 16

Molecule

Question 17

A process in which new substances with new properties are formed?

Answer 17

Chemical reactions

Question 18

A substances mass per unit of volume

Answer 18

Density

Question 19

A mixture characterized by large particles that settles out

Answer 19

Suspension

Question 20

A mixture characterized by intermediate-sized paticles which do not settle out but reflected light passing though

Answer 20

Colloid

Question 21

A mixture characterized by small particles which cannot be seen and do not reflect light passing though

Answer 21

Solution

Question 22

In a solution, the material that does the dissolving

Answer 22

Solvent

Question 23

In a solution the material that is dissolved

Answer 23

Solute

Question 24

Properties which can be observed without changing identify of substance

Answer 24

Physical

Question 25

Why did we test distilled water in the water testing lab?

Answer 25

It has no ions so we know what a test would look like

Question 26

Why did we test the calcium ion reference solution in the water testing lab.

Answer 26

It contained calcium ions so we know what a positive test looks like

Question 27

Even if a test was negative does it mean there were no ions.why

Answer 27

No,it cannot confirm the absence of an ion. It might have been present

Question 28

What would Precipitate look like ?

Answer 28

It would turn cloudy it may settle out over time

Question 29

Why were a reference solution and distilled water used in each test.

Answer 29

It allowed to compare the other test with what a test would look like with less ions

Question 30

The “glue” that hold different kinds of atoms together is the attraction between particles witness these changes ?

Answer 30

Ionic bond

Opposite