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Lelechka [254]
3 years ago
15

Help me please ... i am very confused

Chemistry
2 answers:
Tomtit [17]3 years ago
5 0

Explanation:

how are you confused there just tell me the problem

Setler79 [48]3 years ago
5 0
They gave you the formula, plug it in
M = 732 g
V = 242 cm^3
732 g/ 243 cm^3 = D
Solve for that :)
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What varieties of matter may be the constituents in mixtures?
vodka [1.7K]

Answer: two or more different pure substances, which may be elements or compounds.


Explanation:


The term varieties of matter is kind of ambiguos since it is not defined.


The best approach to the question is to think of matter as it can be classified into to kinds: pure substaces and mixtures.


Elements and compounds are pure substances.


Elements are pure substances constituted by only one kind of atoms. An element cannot be divided into simpler substances either by physical or chemical media.


A compound is a chemical combination of two or more different elements. A compound can be divided into simpler substances by chemical reactions, but not by physical media. The properties of compounds are different of those of the elements of which they are constituted. The composition of a compoind (ratio among its elements) is fixed.


A mixture is the physical combination of two or more pure substances (either different elements or compounds) which can be mixed in any proportion. This is, its composition is variable. The substances that form the mixture can be separated by physical media.




7 0
3 years ago
Could the mechanism for the reaction of crystal violet with sodium hydroxide consist of one elementary step? Explain.
kondaur [170]

Answer:

Yes

Explanation:

Let's write the reaction as

CV⁺+ OH⁻ ⟶ CVOH

The reaction is first order in [CV⁺] and in [OH⁻], so the rate law is

rate = k[CV⁺][OH⁻]

A bimolecular collision between a crystal violet ion and a hydroxide ion as an elementary step would predict the observed rate law.

However, other plausible mechanisms may predict the same rate law.

7 0
3 years ago
Which of the following is an example of biomass used for power?
Otrada [13]

Answer:

D. Corn

Explanation: Corn is a crop and that is one of the certain types of Biomass energy

7 0
4 years ago
Read 2 more answers
I don't understand this I'm confused ​
skad [1K]

Explanation:

1.

Sodium, or Na, is 57.47% of the composition,

Hydrogen, or H, is 2.520% of the composition,

and Oxygen, or O, is 40.001% of the composition.

This is because mass% = mass/total mass x 100%.

2. For every 1 mole of C6H12O6, you need 6 moles of water. Multiply the 5.2 moles you are trying to make by the 6 moles of water you need, and you will need 31.2 moles.

3. x = 7.2 x 4 / 2 = 14.4 mol

5 0
4 years ago
CO + 2H2 ⇌ CH3OH ΔH <0
sveta [45]

Answer:

C. The energy released as the bonds in the reactants are broken is greater than the energy absorbed as the bonds in the product are formed.

Explanation:

  • CO + 2H₂ ⇌ CH₃OH     ΔH <0

As ΔH is negative, the given reaction is exothermic.

That means that <em>the enthalpy of the product is less than the enthalpy of the reactants</em>. In other words, part of the energy from the reactants is used to form new bonds (between C and H, for example), while the other part is transfered outside the system as heat.

Thus the correct answer is C.

5 0
3 years ago
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