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3 years ago

Fill in the blank, please help. (55 points)

Chemistry

1 answer:

Degger [83]3 years ago

7 0

The answer would be evaporation takes place at the surface of an ocean, lake, stream, or other body of water

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Classify which compounds will dissolve in water and which ones will not dissolve in water.

vredina [299]

Answer:

Dissolves in water: Acetone, 1-propanol, Methanol

Do not dissolve in water: Hexane, Decane

Explanation:

From the principle that like dissolves like,polar substances will dissolve in polar solutions, while non-polar substances will dissolve in non-polar substances.

Water is a polar solution, therefore, polar substances will dissolve in it.From the given options:

Acetone is a polar molecule, therefore, it will dissolve in water.

1-propanol is a polar molecule, therefore, it will dissolve in water.

Hexane is a non-polar molecule, therefore, it will not dissolve in water.

Methanol is a polar molecule, therefore, it will dissolve in water.

Decane is a non-polar molecule, therefore, it will not dissolve in water

6 0

3 years ago

1.Explain why the reactivity of group 7 decreases as you move down the group. Try to use the sentence starters here: When group

Kruka [31]

Answer: The reactivity of group 7 decreases as we move down the group because:

Explanation:

The elements of group 7 that is fluorine to iodine. The halogens are non metals and they react with metals to gain electrons. The metals loose electrons and the non metal gains it.

As we move down the group the atomic radius gets bigger( more electron and more proton) and as a result the outer shells move further away from the nucleus.

There is more distance between the negatively charged electrons and positively charged nucleus.

Therefore the force of attraction between the shells and nucleus is lesser or weaker.

This makes attracting an extra electron from metals very difficult which results in weaker reaction.

Consequently, the reactivity decreases as we move down the group 7

5 0

3 years ago

John measures the mass of a cup of chocolate milk and a glass of orange Juice. He places both containers on a balance scale. He

mylen [45]

Answer:

b. John has to pour each liquid into a container with the same mass and then compare them

would be the correct answer. Hope this helps!

Explanation:

5 0

3 years ago

When an iron nail is ground into powder, its mass ____.

Gre4nikov [31]

Explanation:

(a) The mass of an object remains the same always. It is independent of its location. In this case, an iron nail is ground into powder. It means that its mass will remain unchanged. Hence, (a) is the correct option.

(b) Whenever there is a change of color of an object, a chemical reaction occurs. It shows that a reaction happens there. In this problem, a paper turns yellow-brown upon exposure to sunlight. A chemical reaction takes place there. Hence, (b) is the correct option.

3 0

3 years ago

const2013 [10]

$\huge{ \mathrm{ \underline{ Answer }\: \: ✓ }}$

The relationship between mass of matter per unit volume is known as :

$\large \boxed{ \mathrm{density}}$

_____________________________

$\mathrm{ ☠ \: TeeNForeveR \:☠ }$

8 0

3 years ago