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3 years ago

An element is a pure substance. It can not easily be broken down into parts by physical means.

Chemistry

1 answer:

liberstina [14]3 years ago

7 0

Answer: An element is a pure substance. It can not easily be broken down into parts by physical means.

A)True

B)False

The answer is true. 

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How many moles are equal to 7.62 x 1025 molecules lithium hydroxide

ycow [4]

No of moles:-

$\\ \tt\longmapsto \dfrac{No\:of\:atoms}{Avagadro's\; number}$

$\\ \tt\longmapsto \dfrac{7.62(10^{25})}{6.022(10^{23})}$

$\\ \tt\longmapsto 126.5mol$

8 0

3 years ago

What is the density of a liquid that has a mass of 27g and a volume of 30mL?

NNADVOKAT [17]

Answer: 7 g/cm to the third power
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3 years ago

For the reaction 2NOCl(g) <-----> 2NO(g) + Cl2(g), Kc = 8.0 at a certain temperature. What concentration of NOCl must be p

Nat2105 [25]

Answer is: concentration of NOCl is 3.52 M.

Balanced chemical reaction: 2NOCl(g) ⇄ 2NO(g) + Cl₂(g).
Kc = 8.0.
[NOCl] = 1.00 M; equilibrium concentration.
[NO] = x.
[Cl₂] = x/2; equilibrium concentration of chlorine.
Kc = [Cl₂] ·[NO]² / [NOCl].
8.00 = x/2 · x² / 1.
x³/2 = 8.
x = ∛16.
x = 2.52 M.
co(NOCl) = [NOCl] + x.
co(NOCl) = 1.00 M + 2.52 M.
co(NOCl) = 3.52 M; the initial concentration of NOCl.

7 0

3 years ago

Why do solids maintain their shape, whereas fluids do not?

Vinvika [58]

Solids maintain their shape, whereas fluids do not because the molecules in solids maintain a regular pattern and only vibrate, or move very slowly. The correct option among all the options that are given in the question is the last option or option "d". I hope the answer has come to your help.

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3 years ago

Read 2 more answers

Write 2,469,100 in Engineering Notation with 3 significant figures.

Gala2k [10]

Answer: $2.47\times 10^{6}$

Explanation:

Engineering notation : It is the representation of expressing the numbers that are too big or too small and are represented in the decimal form times 10 raise to the power. It is similar to the scientific notation but in engineering notation, the powers of ten are always multiples of 3.

The engineering notation written in the form:

$a\times 10^b$

where,

a = the number which is greater than 0 and less than 999

b = an integer multiple of 3

Now converting the given value of 2,469,100 into engineering notation, we get $2.47\times 10^{6}$

Hence, the correct answer is, $2.47\times 10^{6}$

6 0

3 years ago