chemistry quiz #10 test 2

Question 1

what is covalent bond?

Answer 1

a strong bond; formed by sharing of electrons (strongest bond in chemistry)

Question 2

What is a hydrogen bond?

Answer 2

a weak bond; in DNA molecule

Question 3

what is a mixture?

Answer 3

2 or more elements physically combined no chemically bonds involved, can be separated

Question 4

what is an example of a mixture?

Answer 4

tea and sugar.

Question 5

what are the three types of mixtures?

Answer 5

solution, suspension, colloid

Question 6

what is a solution?

Answer 6

homogeneous; solute (small particles) mixed into solvent (H2O) transparent

Question 7

in a solution, what do the solute and solvent do?

Answer 7

the solute is dissolved and the solvent does the dissolving (liquid)&raquo_space;H2O

Question 8

what is suspension?

Answer 8

large particles suspended in mixture, cloudy

Question 9

what is a colliod?

Answer 9

medium sized particles in mixture, jello like; cytoplasm

Question 10

what is the pH scale?

Answer 10

a standard measurement of the concentration of hydrogen ions

Question 11

what is ionic bond?

Answer 11

the transfer of electrons

Question 12

what is cation?

Answer 12

(+) particle

Question 13

what is anion?

Answer 13

(-) particle

Question 14

what are considered neutral solutions? what is an example of a neutral?

Answer 14

a pH of 7

H2O

Question 15

What is considered an acidic solution?

Answer 15

a pH less than 7

Question 16

what is considered a basic solution (base)? What is an example of a base?

Answer 16

pH more than 7

alkaline

Question 17

What is the difference between each pH number?

Answer 17

10x

Question 18

what is an acid?

Answer 18

sour; high # of H+; low # of OH

Question 19

what is a base?

Answer 19

bitter, slippery; high # of OH; low # of H+ (soapy)

Question 20

what is litmus paper? What kind of test is preformed?

Answer 20

an indicator for the determination of an acid or base

a qualitative test

Question 21

what is a qualitative test?

Answer 21

it tests how acidic a substance is

red: acid. blue: base

Question 22

what is the formula for a qualitative test? what can you substitute?

Answer 22

acid+base —– salt+h2o

stomach+ tums —– salt+ h2o

Question 23

what is the qualitative test called as a whole?

Answer 23

neutralization

Question 24

what is a physical change? example?

Answer 24

appearance changes slightly and it is still recognizable

chewed food

Question 25

what is a chemical change? example?

Answer 25

rearrangement of atoms; appearance totally changed

burned paper

Question 26

what is a chemical equation? what are the variables called in this?

Answer 26

describes a chemical reaction

reactants and products

Question 27

what is the law of concervation?

Answer 27

during a chemical reaction, mass (energy) is neither created nor destroyed

Question 28

what is an organic compound?

Answer 28

carbon is present; found in every living thing; shown by structural formula

Question 29

what is an example of organic compound?

Answer 29

c6h12o6

c12h22o11

Question 30

what is an inorganic compound?

Answer 30

no carbon is present

Question 31

what is an example of an inorganic compound?

Answer 31

H2o