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2 years ago

Which is a pure substance (A) Mixture (B) Solution (C) Molecule

2 answers:

8 0

C. Molecule is a pure substance. It may be 2 or more atoms binding together via covalent bonding (I.e. the sharing of electrons). The bonding of two or more atoms from the same element forms stable molecules.
The bonding of two different atoms or more will result in a completely new substance as compared to the original substances of atoms.

Mixtures, from the name itself, are being mixed with several solutions, where one part of it is soluble, and the other part is insoluble.
●For e.g., sand and seawater being put together forms a mixture, where sea water is water and salt (soluble together) and sand (insoluble with water and salt).

Solutions may be 2 or more substances being mixed together which are soluble.
● For the sea water example above, sea water is the solution, since salt can be desolved in water (i.e. the solute).

Hope this helps! :)

raketka [301]2 years ago

4 0

It's C, I believe

good luck

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Name the 1 isomer of c7h16 that contains an ethyl branch on the parent chain.

cricket20 [7]

An isomer is a compound which has the same atoms as another, but the spatial arrangement of the atoms is different. If we wish to have an ethyl, or two carbon, side chain, then the main chain may be five carbon atoms long. This compound then becomes:

3-ethylpentane; where the parent chain is pentane and the ethyl group is attached to the third carbon from the start of the parent chain.

5 0

2 years ago

Kc = 3.07 x 10-4 at 24°C for 2NOBr(g) ↔ 2NO(g) + Br2(g). If the initial concentration of NOBr = 0.878 M, what is the equilibrium

pav-90 [236]

Answer:

The equilibrium concentration of NO is 0.02124 M.

Explanation:

Given that,

Initial concentration of NOBr = 0.878 M

$k_{c}=3.07\times10^{-4}$

Temperature = 24°C

We know that,

The balance equation is

$2NOBr\Rightarrow 2NO+Br_{2}$

Initial concentration is,

$0.878\Rightarrow 0+0$

Concentration is,

$-2x\Rightarrow 2x+x$

Equilibrium concentration

$0.878-2x\Rightarrow 2x+x$

We need to calculate the value of x

Using formula of concentration

$k_{c}=\dfrac{[NO][Br_{2}]}{[NOBr]^2}$

Put the value into the formula

$3.07\times10^{-4}=\dfrac{[2x][x]}{[0.878-2x]^2}$

$2x^2=3.07\times10^{-4}\times(0.878)^2+3.07\times10^{-4}\times4x^2-2\times2x\times0.878\times3\times10^{-4}$

$2x^2=0.0002367+0.001228x^2-0.0010536x$

$2x^2-0.001228x^2+0.0010536x-0.0002367=0$

$1.998772x^2+0.0010536x-0.0002367=0$

$x=0, 0.01062$

We need to calculate the equilibrium concentration of NO

Using formula of concentration of NO

$concentration\ of\ NO=2x$

Put the value of x

$concentration\ of\ NO=2\times0.01062$

$concentration\ of\ NO=0.02124$

Hence, The equilibrium concentration of NO is 0.02124 M.

7 0

3 years ago

Which of the following describes an energy transformation from chemical to electrical to light energy?

Law Incorporation [45]

The answer is B. a flashlight uses a battery to operate.

The battery represents the chemical energy. This is converted into electricity, which is converted into light energy.

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2 years ago

Read 2 more answers

Hello guys i wanted to ask if anyone could check my answers please :) 10 points

arlik [135]

The first answer is C, condensation is a physical process and the others are chemical.

The second answer is B, it doesn't change depending on location (the answer you chose)

The third answer is A.

The fourth answer is B. Temperature is an intensive property.

No explanations for the ones you got correct.

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2 years ago

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What has the highest ionization energy?

Inessa [10]

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3 years ago