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Lyrx [107]
3 years ago
15

Question 10 (1 point)

Chemistry
1 answer:
Vinil7 [7]3 years ago
7 0

Answer:

A,C,D,B

Explanation:

1killometer=1000m

1mm=0.001m

1cm=0.01m

base unit of length is meter

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A sample of hydrogen occupies a volume of 351 mL at a temperature of 20 degrees Celsius. What is the new volume if the temperatu
xeze [42]
Volume of Hydrogen V1 = 351mL 
Temperature T1 = 20 = 20 + 273 = 293 K 
Temperature T2 = 38 = 38 + 273 = 311 K 
We have V1 x T2 = V2 x T1 
So V2 = (V1 x T2) / T1 = (351 x 311) / 293 = 372.56 
Volume at 38 C = 373 ml
6 0
3 years ago
Two colleagues are measuring the melting point of a substance. They observe two ranges of melting point, at 134-137 °C and 132-1
marissa [1.9K]

Explanation:

impurities affect both melting point and boiling point

in the case of melting point it lowers the melting point

so I guess one of the samples Ie contained impurities

6 0
3 years ago
How many molecules of hydrogen gas are produced when 32.4 g of potassium are added to water?
Yuri [45]
Moles of K = 32.4/39 = 0.83 mole. According to stoichiometry, 2 moles of K produces 1mole of H2. Therefore, 0.83 mole of K produces = 0.83/2 = 0.415 moles of H2. Therefore number molecules of H2 = moles of H2 x 6.02 x 10^23 = 2.4983 x 10^23 molecules. Hope this helps!
4 0
3 years ago
A sample of an unknown compound with a mass of 0.847 g has the following composition: 50.51 % fluorine and 49.49 % iron. When th
sergejj [24]

Answer: 0,4278g of F and 0,4191g of Fe

Explanation: it's possible to calculate the mass of each element by multiplying the percentage (decimal) of the element by the mass of the compound.

For Fluorine (F)

0,847g * 0,5051 = 0,4278g of F

For iron (Fe)

0,847 * 0,4949 = 0,4191g of Fe

This is determined because even when the compound is decomposed, due to conservative law of mass, the decomposition process do not affect the amount of matter, so the mass of the elements remain even if they are separated from the original molecule.

At the end, the sum of the elements masses should be the total mass of the compound.

4 0
2 years ago
Read 2 more answers
What does collide mean
Gala2k [10]

Answer:

hit with force when moving.

"she collided with someone"

Similar:

crash (into)

come into collision (with)

bang (into)

slam (into)

impact (with)

hit

strike

run into

meet head-on

smash into

smack into

cannon into

plow into

bump into

crack into/against

knock into

dash against

barrel into  -

come into conflict or opposition.

"in his work, politics and metaphysics collide"

Explanation:

7 0
2 years ago
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