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3 years ago

Three facts about Dalton’s Model of the Atom:

Chemistry

1 answer:

Andreyy893 years ago

7 0

Explanation:

Everything is composed of atoms, which are the indivisible building blocks of matter and cannot be destroyed. All atoms of an element are identical. The atoms of different elements vary in size and mass. Compounds are produced through different whole-number combinations of atoms.

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As NH4Cl dissolves in water, and cools the solution,

azamat

Answer:

d. delta H is positive, and delta S is positive

Explanation:

The process of dissolution of NH4Cl is:

NH4Cl(s) → NH4+(aq) + Cl-(aq)

As the solution is cooled, the process is absorbing energy, that means ΔH > 0. (ΔH < 0 when the heat is released).

As there are produced 2 ions from 1 solid molecule, the disorder is increasing and ΔS > 0

The right answer is:

<h3>d. delta H is positive, and delta S is positive</h3>

5 0

3 years ago

What is the solution to the problem expressed to he correct number of significant figures? 12.0/7.11

Law Incorporation [45]

Answer: The solution to the problem expressed to he correct number of significant figures is 1.69

Explanation:

Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.

The rule applied for multiplication and division is :

The least precise number determines the number of significant figures in the answer.

As 12.0 has 3 significant digits and 7.11 also has 3 significant digits, the answer would also contain 3 significant digits.

For $\frac{12.0}{7.11}=1.69$

Thus the solution to the problem expressed to he correct number of significant figures is 1.69

6 0

3 years ago

Someone please help fast

Volgvan

Answer:

The last region should be right

Explanation:

3 0

3 years ago

Which of the following compounds has the general formula X3Y2?Which of the following compounds has the general formula X3Y2?

prisoha [69]

There are no above options to choose from so I am giving an example of a X3Y2 formula which is Magnesium nitride, the formula is Mg3N2.

6 0

2 years ago

I need your help!! about Chemistry (15 point!!)

irakobra [83]

1. I think it is true?
2. Low melting points
3. True
4. Atomic number, I think it’s periods?
5. Groups?

Sorry, I might not get all of them right :(

Hope this helps you in any way!!

6 0

3 years ago