Question

How is an ionic bond formed?

An electron is transferred from one atom to another.
Two atoms share the electrons in their outermost shells.
Both atoms in the bond lose an electron.
Both atoms in the bond gain an electron.

Answer 1

what grade are you in?

Answer 2

It's A

Answer 3

An ionic bond is formed when two ions of opposite charge come together by attraction, NOT when an electron is transferred.

Answer 4

10th... Why?

Answer 5

Which is a chemical reaction?

salt dissolving
water vaporizing
ice melting
wood burning

Answer 6

this is the next question

Answer 7

ok did you get the first one? and what grade are you in?

Answer 8

Wood burning is chemical

Answer 9

I already said that I was in 10th grade

Answer 10

oh yea ok sorry

Answer 11

How many nitrogen atoms are in one molecule of the compound Al(NH3)2?

one
three
two
six

Answer 12

burning wood is wrong

Answer 13

what is it than

Answer 14

Two is the answer

Answer 15

oh never mind it changes into ash and cannot change back so johnny is right

Answer 16

What name is given to elements with the same number of protons but differing numbers of neutrons?

isotopes
acids
ions
bases

Answer 17

I will be back in a few ok

Answer 18

ok

Answer 19

Isotopes

Answer 20

hi johnny so you are also helping him

Answer 21

Ya

Answer 22

cool well i am too. what grade are you in?

Answer 23

I am back

Answer 24

ok

Answer 25

Isotopes is the answer

Answer 26

Which is an example of a physical change?

A nail rusts.
Water evaporates.
Gasoline ignites.
Wood rots.

Answer 27

I am in 8th grade

Answer 28

ok

Answer 29

water evaporates

Answer 30

Water evaporates is a physical change

Answer 31

im in 7th

Answer 32

k talk amungst your self I will be back in 10-15 min

Answer 33

you back yet?

Answer 34

I am back

Answer 35

ok

Answer 36

Which pairing matches the type of substance with the item it donates?

acid: electron pair; base: H+ ion
acid: proton; base: electron pair
acid: electron pair; base: proton
acid: H+ ion; base: proton

Answer 37

i gtg sorry bye

Answer 38

why do you have to go

Answer 39

D

Answer 40

How many oxygen atoms are in one unit of the compound Ba(OH)2?

3
4
2
1

Answer 41

i have to go because i need to go somewhere

Answer 42

1

Answer 43

Which formula for sulfuric acid is written correctly to show one sulfur atom, two hydrogen atoms, and four oxygen atoms?

HS2O4
H2(SO2) 2
H2SO4
(HS)2O4

Answer 44

C H2SO4

Answer 45

How does a phospholipid behave in water?

The phosphate head does not mix with water; the fatty acid tails do.
The phosphate head mixes with water; the fatty acid tails do not.
The phosphate head and the fatty acid tails mix with water.
The phosphate head and the fatty acid tails do not mix with water.

Answer 46

B

Answer 47

How do catalysts affect the energy of reactions?

They absorb excess energy that would otherwise stop reactions from happening.
They lower the activation energy required for the reactions to take place.
They act as low-energy materials that are used to make the products of the reactions.
They act as fuel that burns and provides energy for the reactions.

Answer 48

B

Answer 49

Which of these bases form a true complementary pair?

adenine and guanine
thymine and uracil
cytosine and thymine
cytosine and guanine

Answer 50

D

Answer 51

Which nitrogen base replaces thymine (T) in RNA?

adenine (A)
guanine (G)
uracil (U)
cytosine(C)

Answer 52

C

Answer 53

Uracil U

Answer 54

Breaking down food to get energy requires _____ that help chemical reactions take place.

DNA molecules
amino acids
RNA molecules
catalysts

Answer 55

Catalysts