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defon
3 years ago
7

How does a compound differ from a mixture?

Chemistry
2 answers:
uysha [10]3 years ago
7 0
A compound contains atoms of different elements chemically combined together in a fixed ratio. While on the other hand, a mixture is a combination of two or more substances where there is no chemical combination or reaction.
Debora [2.8K]3 years ago
5 0

Answer:

In a mixture, each substance is still the same and don't really combine. In a compound, the substances are chemically combined (so the substances that went in have technically changed).

Explanation:

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Provide an explanation at the subatomic level to explain why different colors are observed for different metal salts.
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Answer:

When you heat an atom, some of its electrons are "excited* to higher energy levels. When an electron drops from one level to a lower energy level, it emits a quantum of energy. ... The different mix of energy differences for each atom produces different colours. Each metal gives a characteristic flame emission spectrum.

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If animals could talk, which animal would be the most annoying?
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Answer:

Birds or maybe a sloth or maybe cats or Rooster or Dogs. Well some Birds already talk but like they talk a lot.  Sloths they are slow and imagine having a sloth making the same slow motion sounds all day. Or cats Asking for food. Rooster Wake up really early just imagine if it could talk. Now Dogs barking at you but instead of barking imagine them screaming at you. I'm Gonna eat you full.

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Write a hypothesis about the addition of compost (nutrients) to the soil and ecological succession using this format: “If . . .
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Answer:

This is the correct answer please give me 5-star and likes

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If nutrients are added to an ecosystem, then the composition of the plant community at different stages of succession will also change because different species take advantage of different soil conditions.

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9. Formation of Coloured Ions​
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3 years ago
The sum of the first 10 terms of an arithmetic progression is 120 and the sum of first twenty is 840. find sum of first 30 terms
STatiana [176]

Answer:

The sum of first 30 terms of the arithmetic progression is <u>2160.</u>

Explanation:

For an arithmetic progression, the sum of first n terms with first term as a and common difference d is given as:

S_n=\frac{n}{2}(2a+(n-1)d)

Now, it is given that:

For\ n=10,S_n=120\\For\ n=20,S_n=840

Now, plug in these values and frame two equations in a\ and\ d

S_{10}=\frac{10}{2}(2a+(10-1)d)\\120=5(2a+9d)\\2a+9d=\frac{120}{5}\\2a+9d=24------------1

S_{20}=\frac{20}{2}(2a+(20-1)d)\\840=10(2a+19d)\\2a+19d=\frac{840}{10}\\2a+19d=84-----------2

Now, we solve equations (1) and (2) for a\ and\ d. Subtract equation (1) from equation (2). This gives,

2a+19d-2a-9d=84-24\\19d-9d=60\\10d=60\\d=\frac{60}{10}=6

Now, plug in the value of d=6 in equation (1) and solve for a.

2a+9(6)=24\\2a+54=24\\2a=24-54\\2a=-30\\a=\frac{-30}{2}=-15

Plug in the values of a=-15,\ n=30\ and\ d=6 in the sum formula to find the sum of first 30 terms.

Now, the sum of first 30 terms is given as:

S_{30}=\frac{30}{2}(2(-15)+(30-1)(6))\\S_{30}=15(-30+29(6))\\S_{30}=15(-30+174)\\S_{30}=15(144)=2160

Therefore, the sum of first 30 terms of the arithmetic progression is 2160.

4 0
3 years ago
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