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alina1380 [7]
4 years ago
11

1) Which of the following is the best example of a physical change?

Chemistry
1 answer:
never [62]4 years ago
4 0

1 is b and 2 is also b

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In a thin layer chromatography experiment, a plate of length 9.3 cm was used and a horizontal line was made at 1.45 cm above the
dezoksy [38]

Answer: The R_f value is 0.664

Explanation:

Distance travelled by solvent front = (7.7-1.45)cm = 6.25 cm

Distance travelled by unknown = (5.6-1.45) cm = 4.15 cm

 The retention factor or the R_f value is defined as the ratio of distance traveled by the unknown to the distance traveled by the solvent front.

R_f=\frac{\text {distance travelled by unknown}}{\text {distance travelled by solvent}}

R_f=\frac{4.15}{6.25}=0.664

Thus the R_f value is 0.664

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3 years ago
What is empirical and moleculer formula?.
den301095 [7]
The molecular formula shows the exact number of molecules. Therefor, the empirical formula is the simplest formula of the molecular formula
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3 years ago
You react 25.0 grams of aluminum with iron (II) chloride. How many grams of iron will you
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Explanation:

hope the picture above helps you to understand:)

4 0
3 years ago
1. A sample of gas has a volume of 6.20 L at 20°C at a pressure of 1.10 atm. What is its volume at the same temperature and at a
nadya68 [22]

Answer:

7.37 L is the new volume

This can be understood as a system that maintains its constant T ° and if the moles of the gas are not modified, the pressure varies inversely proportional to the volume.

Explanation:

We can apply the Ideal Gases Law, to solve this problem. Moles are the same in both cases, the T° also keeps on constant.

P . V = n . R . T      For this first situation

P . V = n . R . T      For the second situation

V = n . R . T / P

n . R . T will be the same, because n is the number of moles, T means T° and R is a physic constant, so for the first case we can define:

P₁ . V₁, and for the second case, P₂ . V₂

We match both equations, and we replace data

6.20L. 1.10 atm = 0.925 atm . V₂

(6.20L. 1.10 atm) / 0.925 atm = V₂

V₂ = 7.31 L

If the volume decreases, the pressure increases more because the molecules collide more with the walls of the container but the opposite happens where if the volume increases (<u>as in the case of exercise</u>), the pressure will be lower. Gas molecules will not collide so much with the walls

5 0
4 years ago
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A compound is a pure substance. Which of the following is used to represent a compound?
Airida [17]
The answer would be A
7 0
4 years ago
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