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Lena [83]
3 years ago
9

How does the appearance of a substance change when it changes phase?

Chemistry
1 answer:
kicyunya [14]3 years ago
6 0

Answer:

Melting: the substance changes back from the solid to the liquid. Condensation: the substance changes from a gas to a liquid. Vaporization: the substance changes from a liquid to a gas. Sublimation: the substance changes directly from a solid to a gas without going through the liquid phase.

Explanation:

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What type of reaction is most likely to occur when barium reacts with fluorine? write the chemical equation for the reaction?
scZoUnD [109]
Answer is: this is synthesis reaction.<span> 
</span>Chemical reaction: Ba + F₂ → BaF₂.
Synthesis reaction<span> is a type of reaction in which multiple reactants combine to form a single product.
</span>In barium fluoride, barium has oxidation number +2 and fluorine has oxidation number -1, so compound has neutral charge.
6 0
2 years ago
8.38e-21 Q^2 -1.07e-23 Q^2 +3.15e+19<br> Solve for Q
GarryVolchara [31]
8.38e -21Q^2 -1.07e -23Q^2 +3.15e +19
= 10.46e -44Q^2 + 19
44Q^2 = 10.46e + 19
Q^2 = 523/2200e + 19/44
Q1= ≈ -1.03828
Q2= ≈ 1.03828
4 0
3 years ago
A solution of pyridinium bromide has a pH of 3.00. What is the concentration of the pyridinium cation at equilibrium, in units o
Artemon [7]

Answer:

The concentration of the pyridinium cation at equilibrium is 1.00×10⁻³ M

Explanation:

In water we have

C₅H₅NHBr + H₂O ⇒ C₅H₅NH+ + Br−

Pyridinium Bromide (C₅H₅NHBr) Dissociates Completely  Into C₅H₅NH+ And Br− as such it is a strong Electrolyte.

Therefore the number of moles of positive ion produced per mole of C₅H₅NHBr  is one

pH = - log [H₃O⁺] Therefore 10^-pH = [H₃O⁺] = concentration of C₅H₅NHBr

= 10⁻³ = 0.001M = concentration of C₅H₅NHBr

The concentration of C₅H₅NHBr is = 1.00×10⁻³ M to two places of decimal

4 0
3 years ago
A chemist adds two substances together in a beaker. When he combines the substances, a solid substance is formed. He filters the
aliya0001 [1]

Answer:

collecting relevant data

Explanation:

got this answer from another website ;)

7 0
3 years ago
What is the pH of 2.5×10 to the power of negative2IM solution of HCL?
Archy [21]

Answer:

pH=1.6

Explanation:

Recall that pH= -log [H+]

Plug the 2.5 x 10^-2 into [H+].

-log (2.5 x 10^2)

=1.6

Hoped this helped!

3 0
3 years ago
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