basic chemistry

Question 1

Describe the structure of an atom.

Answer 1

Nucleus made up of P and N surrounded by e-

Question 2

Define atomic number and atomic mass.

Answer 2

atomic # is protons and atomic mass is sum of protons and neutrons

Question 3

Know the charges and amus of protons, neutrons electrons.

Answer 3

Protons are Positive, electrons are negative and neutrons are neutral

Question 4

Definine Valence

Answer 4

of electrons in outermost energy level

Question 5

Define chemical bond

Answer 5

Holds atoms together

Question 6

define covalent bonds. How many does carbon have?

Answer 6

covalent atoms share electrons. Carbon has four valence electrons.

Question 7

define ionic bonds

Answer 7

electrons are transferred

Question 8

what is an ion?

Answer 8

charged atom or molecule

Question 9

define radioisotope

Answer 9

unstable isotope that emits radiation

Question 10

defined the term solution, solute, solvent

Answer 10

in a solution, the solute is the substance being dissolved in the solvent

Question 11

define acid and base

Answer 11

acid releases, H(+)when dissolved in water. Base releases 0H-when dissolved in water.

Question 12

what is the pH scale?

Answer 12

measures acidity and alkalinity of a substance

Question 13

no the pH of water. No the range of human body pH.

Answer 13

pH of water is seven. Human body pH is 7.35 to 7.45.

Question 14

what do organic compounds contain?

Answer 14

carbon and hydrogen