Question

#1: In the reaction 2K + 2H2O---> 2KOH + H2, which compound has an element ratio of 1 : 1 : 1?

A. K

B. H2O

C. KOH

D. H2

**my answer; C

is that right?? :/ @aaronq :)

Answer 1

its right (Y) off to a good start!

Answer 2

#3: A substance has half the number of particles as 12 grams of carbon-12. How many moles are in the substance?

A. 0.5

B. 1.0

C. 1.5

D. 2.0

**my answer; A

is that right? :)

Answer 3

#4: Which of the following has 1.8 × 10^24 hydrogen atoms?

A. 1 mole of water (H2O)

B. 1 mole of peroxide (H2O2)

C. 1 mole of ammonia (NH3)

D. 1 mole of hydrogen gas (H2)

**my answer; C

is that right?

Answer 4

#5: What is the molar mass of magnesium sulfate heptahydrate (MgSO4 7H2O)? Be sure to include the mass of all elements in the formula including the elements in water.

A. 246 g/mol

B. 138 g/mol

C. 120 g/mol

D. 73 g/mol

** my answer: A

is that correct?? :)

Answer 5

@aaronq :)

Answer 6

#6: You have 100 grams of rubidium bromide (RbBr). How many moles do you have?

A. 0.61 mol

B. 1.00 mol

C. 1.22 mol

D. 2.00 mol

**my answer: A

is that right? :)

Answer 7

#7: What volume will 0.75 moles of oxygen gas occupy at STP?

A. 16.8 L

B. 20.0 L

C. 22.4 L

D. 33.6 L

**my answer: A

is that right @aaronq ?? :)

Answer 8

#8: You have a 5-liter container with 1.30 × 10^24 molecules of ammonia gas (NH3). How many molecules of hydrogen gas (H2) are in an identical container at the same temperature and pressure?
A. 6.02 × 10^23 molecules
B. 2.00 × 10^23 molecules
C. 6.02 × 10^24 molecules
D. 1.30 × 10^24 molecules

**my answer; D

is that correct??? :)

Answer 9

#9: What mass will 33.6 L of oxygen gas (O2) have at STP?

A. 16 g

B. 32 g

C. 34 g

D. 48 g

**my answer; D. 48 g

is that right???

Answer 10

#10: You have one mole of a diatomic gas. Which of the following statements is true?

A. You have one-third the number of particles that are in 12 grams of carbon-12.

B. You have the same number of particles that are in 12 grams of carbon-12.

C. You have three times the number of particles as in 12 grams of carbon-12.

D. You have six times the number of particles that are in 12 grams of carbon-12.

**my answer; B

is that right??? :O

Answer 11

yeas you have one mole of particles, ( two moles of atoms )

Answer 12

wait, so 2-10 are correct?? :/

Answer 13

i have only checked #10 so far

Answer 14

and sorry!! here is #2, look like it got deleted :(


#2: In which of the following reactions do five total molecules of reactants produce four total molecules of products?

A. N2 + 3H2 ---> 2NH3

B. SnO2 + 2H2 ---> Sn + 2H2O

C. 2H2S + 3O2 ---> 2SO2 + 2H2O

D. 2SO2 + O2 --> 2SO3

my answer; A

is that right??

Answer 15

oh oaky!! :)

Answer 16

#2 is not right

option A N_2 + 3H_2 is only four particles of reactants

#3 is right

Answer 17

ok :) so what is #2 then?? is it C? :)

Answer 18

yep

Answer 19

awesome! :) what about 4-9? :)

Answer 20

#4 is right

Answer 21

#5 is right

Answer 22

#6 is right

Answer 23

:) yayy!! what about 7-9? :)

Answer 24

7 and 9 are good (Y)

Answer 25

okay! yay!! :) is 8 right too?

Answer 26

#7 is right

Answer 27

awesome!! :)

Answer 28

i think #8 is right too

Answer 29

okay great!! thanks!! :)

@UnkleRhaukus can u pls give @aaronq a medal?? i can only give one :(

Answer 30

9# is right

Answer 31

haha aw thanks guys, medals all around

Answer 32

great work

Answer 33

haha yeah :)

and thanks!! thanks for all ur help!!! :D