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3 years ago

Balance the following chemical equation. HCI +K2CO3 -->KCI +H2O +CO2

Chemistry

1 answer:

IrinaVladis [17]3 years ago

8 0

Answer:

2HCl + K2CO3 = 2KCl + H2O + CO3

I would appreciate if my answer is chosen as a brainliest answer

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Write a scientific explanation to explain how atoms, molecules, and extended structures make up substances.

STALIN [3.7K]

Answer:

Pure substances are made up of a bulk quantity of individual atoms or molecules.

Each pure substance is made up of one of Individual atoms of the same type that are connected to form extended structures.

A chemical reaction happens when substances break apart or combine to form one or more new substances.

New substances form when bonds break and new bonds form.

3 0

3 years ago

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For a reaction A + B → products, the following data were collected. Experiment Number Initial Concentration of A (M) Initial Con

Afina-wow [57]

Answer:

Rate constant k = 1.57*10⁻⁵ s⁻¹

Explanation:

Given reaction:

$A\rightarrow B$

Expt [A] M [B] M Rate [M/s]

1 3.40 4.16 1.82*10^-4

2 4.59 4.16 3.32*10^-4

3. 3.40 5.46 1.82*10^-4

$Rate = k[A]^{x}[B]^{y}$

where k = rate constant

x and y are the orders wrt to A and B

To find x:

Divide rate of expt 2 by expt 1

$\frac{3.32*10^{-4} }{1.82*10^{-4} } =\frac{[4.59]^{x} [4.16]^{y} }{[3.40]^{x} [4.16]^{y} }\\\\x =2$

To find y:

Divide rate of expt 3 by expt 1

$\frac{1.82*10^{-4} }{1.82*10^{-4} } =\frac{[3.40]^{x} [5.46]^{y} }{[3.40]^{x} [4.16]^{y} }\\\\y =0$

Therefore: x = 2, y = 0

$Rate = k[A]^{2}[B]^{0}$

To find k

Use rate for expt 1:

$k = \frac{Rate1}{[A]^{2} } =\frac{1.82*10^{-4}M/s }{[3.40]^{2} } =1.57*10^{-5} s-1$

6 0

3 years ago

how many moles of hydrogen gas will be produced if you start with 2.5 moles of magnesium and an excess of hydrochloric acid give

Vinil7 [7]

Number of moles of Hydrogen gas produced = 2.5 moles

Given the balanced chemical equation,

$Mg+2HCl \rightarrow MgCl_2+H_2$

This means, 1 mole of Mg and 2 moles of HCl gives 1 mole of Hydrogen gas.

Given that 2.5 moles of Magnesium is taken and an excess of Hydrochloric acid.

The mole ratio of Magnesium and Hydrogen = 1:1

Thus 2.5 moles of Magnesium with an excess of Hydrochloric acid will yield 2.5 moles of Hydrogen gas.

[By referring excess of HCl, we may assume that it contains at least 5 moles of HCl. Then only 2.5 moles of Mg will produce 2.5 moles of Hydrogen gas].

Learn more about the mole ratio at brainly.com/question/19099163

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2 years ago

What is chalk made of?

aksik [14]

I think it is calcium carbonate, from sedimentary rocks and such

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4 years ago

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Why don't we see a lot of stars in day time?

Furkat [3]

Explanation:

Stars aren't visible during the sunlit hours of daytime because the light-scattering properties of our atmosphere spread sunlight across the sky. Seeing the dim light of a distant star in the blanket of photons from our Sun becomes as difficult as spotting a single snowflake in a blizzard. (put in your own words this is from online)

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3 years ago