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AysviL [449]
2 years ago
15

3.04 Quiz: Chemical Reactions Please help me

Chemistry
1 answer:
coldgirl [10]2 years ago
5 0

most of them are chemical because they could not go back to there original form like if you cut paper that is physical if you burn the paper that would be chemical because it would not longer be paper

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The volume of a sample of nitrogen is 6.00 liters at 35oC and 0.75 atm. What volume will it occupy at STP?
joja [24]
The  volume that  will  occupy  at STP  is  calculated   as  follows
by use  of ideal  gas  equation
that is  PV=nRT  where n  is  number of  moles  calculate  number of moles

n= PV/RT
p=0.75 atm
V=6.0  L
R = 0.0821  L.atm/k.mol
T=  35  +273= 308k
n=?

n=  (o.75  atm  x  6.0 L)/( 0.0821 L.atm/k.mol  x 308 k)=  0.178 moles

Agt  STP  1 mole=  22.4 L  what obout  0.178 moles

=  22.4  x0.178moles/ 1moles =3.98 L( answer C)
3 0
3 years ago
A bumblebee flies with a ground speed of 15.0 m/s . Calculate its speed in km/h.
zheka24 [161]
Speed in km/hr = 15 x 18
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                          =   54 km/hr.

Hope this helps!

5 0
3 years ago
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SOMEONE PLEASE HELP! WILL GIVE BRAINLIEST!
Elis [28]

Answer:

1 At 0C° KNO3 is least soluble

2 Approximately 65 grams

3 About 30 grams

4 yes it increases at the same rate can be explained by straight line graph

Explanation:

3 0
2 years ago
What is the percent of composition by mass of hydrogen in NH4HCO3 (gram-formualmass=79 grams/mole)?
musickatia [10]
5/79=0.063
0.063 x 100 = 6.3%
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3 years ago
What is the empirical formula
lord [1]

A formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.

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