ATI Science- Chemistry

Question 1

Atomic mass formula

Answer 1

total number protons + neutrons in the nucleus

Question 2

atomic number is the same as

Answer 2

of protons

Question 3

If an atoms has an equal # of protons and electrons,

Answer 3

it is a neutral atom (electrically neutral)

Question 4

When an atom has more protons than electrons, its a

Answer 4

cation (positively charged)

Question 5

when an atom has more electrons than protons, its an

Answer 5

anion (negatively charged)

Question 6

all matter consists of

Answer 6

atoms

Question 7

atoms bond together to make

Answer 7

molecules

Question 8

If an atom has an unequal # of protons and electrons, it is an

Answer 8

ion

Question 9

various form of an element w/ different # of neutrons , thus resulting in different masses of the elements

Answer 9

isotopes

Question 10

how can isotopes be written?

Answer 10

(element- mass number) or (element w/ atomic mass at top and atomic # on bottom)

Question 11

electrons located on outermost shell

Answer 11

valence electrons

Question 12

What determines bonding behavior?

Answer 12

valence electrons (valence shell can either be filled or emptied)

Question 13

How many shells surround the nucleus?

Answer 13

4

Question 14

The farther away from the nucleus an electron is , means

Answer 14

the more energy the electron has

Question 15

When atoms gain, lose, or share an electron in the valence shell,

Answer 15

chemical bonds form

Question 16

What is created when an atom gains electrons

Answer 16

anion/negative ion

Question 17

What is created when an atom loses electrons

Answer 17

cation/ positive ion

Question 18

Most atoms (especially those shown on periodic table) ….

Answer 18

are neutral atoms

Question 19

when atoms of the same element bond together, it forms

Answer 19

a molecule / crystalline solid

Question 20

when 2 or more atoms bond together, it forms a

Answer 20

compound

Question 21

bond formed between two oppositely charged ions

Answer 21

ionic bonding

Question 22

atoms that share electrons have what type of bond

Answer 22

covalent bonds

Question 23

when atoms share electrons equally, what type of bond?

Answer 23

non polar covalent bond

Question 24

when atoms share electrons unequally, what type of bond?

Answer 24

polar covalent

Question 25

Majority of elements on periodic table are

Answer 25

Metals

Question 26

_____ are sitauted to the left, _____ to the right and _____ in the middle

Answer 26

Metals, nonmentals, metalloids

Question 27

Density formula

Answer 27

D= mass/volume

Question 28

octet rule

Answer 28

atoms combine in way that each atom has 8 electrons filling their valence shell

Question 29

metal + non metal

Answer 29

ionic bond

Question 30

non metal + non metal

Answer 30

covalent bond

Question 31

atoms goals are to ____

Answer 31

satisfy octet rule/ fill valence shells w/ 8 atoms

Question 32

electronegativity of 0.5 or more

Answer 32

polar covalent

Question 33

electronegativity of less than 0.5

Answer 33

nonpolar covalent

Question 34

unit that indicates mass

Answer 34

mg

Question 35

Which of the following substances is responsible for donating H+ ions to act as a
buffer when blood pH rises?

Answer 35

carbonic acid

Question 36

Nitrogen gas is extremely stable because it contains

Answer 36

triple covalent bonds

Question 37

Carbon has an atomic number of 6. Which of the following is true about isotope C-12?

Answer 37

C-12 possesses 6 neutrons and 6 protons in its nucleus

Question 38

When an ionic salt is dissolved in water, the ions CO3 and K+ are formed. Which is the formula for the salt?

Answer 38

K2CO3