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3 years ago

Plz help 10 points!!!!!!

Chemistry

2 answers:

Alex_Xolod [135]3 years ago

8 0

Answer:

Where are all my chemistry geniuses at??

1. 2HG + O2 = 2HGO

2. Ca + 2H2O = Ca(OH)2 + H2

3. H2 + Cl2 = 2HCl

4. Fe + S = FeS

Explanation:

Hope it helped!

eduard3 years ago

6 0

Answer:

Mercury and oxygen react to yield mercuric oxide. > 2Hg + O2 = 2HgO

Calcium and water react to yield calcium hydroxide and hydrogen. > Ca + 2H2O = Ca(OH)2 + H2

Hydrogen and chlorine react to yield hydrochloric acid. > H2 + Cl2 = 2HCl

Iron and sulfer react to yield iron sulfide. > Fe + S = FeS

Explanation:

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2 years ago

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Which of the following best describes a mole as used in chemistry?

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Answer: a very large number of objects

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3 years ago

As with other ionic compounds, potassium bromate, KBrO3, dissociates into ions when it dissolves in water. If 13.8 g of KBrO3 is

chubhunter [2.5K]

Answer:

ΔH of dissociation is 38,0 kJ/mol

Explanation:

The dissociation reaction of KBrO₃ is:

KBrO₃ → K⁺ + BrO₃⁻ 

This dissolution consume heat that is evidenced with the decrease in water temperature.

The heat consumed is:

q = CΔTm

Where C is specific heat of water (4,186 J/mol°C)

ΔT is the temperature changing (18,0°C - 13,0°C = 5,0°C)

And m is mass of water (150,0 mL ≈ 150,0 g)

Replacing, heat consumed is:

q = 3139,5 J ≡ 3,14 kJ

13,8 g of KBrO₃ are:

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Thus, ΔH of dissociation is:

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I hope it helps!

3 0

3 years ago

If 45.0 mL of a 0.0500 M HNO3, 10.0 mL of a 0.0500 M KSCN, and 30.0 mL of a 0.0500 M Fe(NO3)3 are combined, what is the initial

jeka94

Answer:

the initial concentration of SCN- in the mixture is 0.00588 M

Explanation:

The computation of the initial concentration of the SCN^- in the mixture is as follows:

As we know that

$KSCN \rightarrow K^ + SCN^-$

As it is mentioned in the question that KSCN is present 10 mL of 0.05 M

So, the total milimoles of SCN^- is

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3 years ago

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lbvjy [14]

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