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3 years ago

Why is it good to use blue and red litmus for the same solution?

1 answer:

6 0

Under acidic conditions, the solution is red, and under alkaline conditions, the solution is blue. Chemical reactions other than acid-base can also cause a color change to litmus paper. For instance, chlorine gas turns blue litmus paper white – the litmus dye is bleached, because of presence of hypochlorite ions.

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Electrolysis is an endothermic process when an electric current is passed through water and separates it into hydrogen and oxyge

azamat

Answer:

IM SORRY I NEED THIS ONE

Explanation:

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3 0

3 years ago

What is the percent composition by mass of hydrogen in nh4hco3

Simora [160]

<u>Answer:</u> The percent composition by mass of hydrogen in given compound is 6.33 %

<u>Explanation:</u>

We are given:

A chemical compound having chemical formula of $NH_4HCO_3$

It is made up by the combination of 1 nitrogen atom, 5 hydrogen atoms, 1 carbon atom and 3 oxygen atoms

To calculate the percentage composition by mass of hydrogen in the compound, we use the equation:

$\%\text{ composition of Hydrogen}=\frac{\text{Mass of hydrogen}}{\text{Mass of compound}}\times 100$

Mass of compound = $[(1\times 14)+(5\times 1)+(1\times 12)+(3\times 16)]=79g/mol$

Mass of hydrogen = $(5\times 1)=5g/mol$

Putting values in above equation, we get:

$\%\text{ composition of Hydrogen}=\frac{5g/mol}{79g/mol}\times 100=6.33\%$

Hence, the percent composition by mass of hydrogen in given compound is 6.33 %

6 0

3 years ago

20 Points!! Which of the following is a synthesis reaction? AgNO3+NaCI--> AgCI+NaNO3

lianna [129]

The third one
synthesis reactions have multiple reactants that synthesize into one product

5 0

3 years ago

Which two changes of state can be caused by removing thermal energy from a substance? choose two

crimeas [40]

Answer:

B and C

Explanation:

The correct answer is Condensation and Deposition

4 0

3 years ago

Read 2 more answers

How many kj of heat are needed to completely vaporize 1.30 moles of h2o? the heat of vaporization for water at the boiling point

Cerrena [4.2K]

The Kj of heat that are needed to completely vaporize 1.30 moles of H2O if the heat of vaporization for water is 40.6 Kj/mole is calculated as below

Q(heat) = moles x heat of vaporization)

=1.30 mol x40.6 kj/mol= 52.78 Kj is needed

6 0

3 years ago

Read 2 more answers