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3 years ago

HELP PLEASE!! BRANIEST MARK IF ITS CORRECT!

Chemistry

1 answer:

Brums [2.3K]3 years ago

5 0

Answer:

The answer to your question is: 6 ml of HCl

Explanation:

1.- Molarity of NaCl in solution

n = # of moles

M = n / volume (l)

n = M x v

n = (0.1) (0.030)

n = 0.003 moles of NaOH

2.- Number of moles of HCl that react

From the reaction 1 mol of NaOH ----------------- 1 mol of HCl

0.003 moles ----------------- x

x = (0.003 x 1) / 1 = 0.003 moles of HCl

3.- Volume of HCl that react

M = n/ V

V = n / M

V = 0.003 / 0.5

V = 0.006 l

V = 6 ml

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Identify which result of a physical rather than a chemical change

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Explanation:

A physical change is change that alters the physical properties of matter especially its form and state.

In many cases, the change is easily reversible.

Examples are change of state such as boiling, melting, freezing, condensation, sublimation e.t.c

A chemical change is one in which a new kind of matter is formed. It is always accompanied by energy changes.

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3 years ago

Thermal energy changes states because

Artyom0805 [142]

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3 years ago

Use the following equation to answer the questions below:

Gala2k [10]

Explanation:

The equation of the reaction is given as;

Be + 2HCl → BeCl2 + H2

What is the mass of beryllium required to produce 25.0g of beryllium chloride?

1 mol of Be produces 1 mol of BeCl2

Converting to mass;

Mass = Molar mass * Number of moles

9.01g of Be produces 79.92g of BeCl2

xg of Be produces 25g of BeCl2

Solving for x;

x = 25 * 9.01 / 79.92

x = 2.82 g

What is the mass of hydrochloric acid required to produce 25.0g of beryllium chloride? g

Converting 25.0g of beryllium chloride to moles;

Number of moles = Mass / Molar mass

Number of moles = 25 / 79.92 = 0.3128 mol

2 mol of HCl produces 1 mol of BeCl2

x mol of HCl would produce 0.3128 mol of BeCl2

solving for x;

x = 0.3128 * 2 = 0.6256 mol

Converting to mass;

Mass = 0.6256 * 36.5 = 22.83 g

What is the mass of hydrogen gas produced when 25.0g of beryllium chloride is also produced? g

25g of BeCl2 = 0.3128 mol of BeCl2

From the equation;

1 mol of H2 is produced alongside 1 mol of BeCl2

This means;

0.3128 mol of H2 would also be produced alongside 0.3128 mol of BeCl2

Mass = Number of moles * Molar mass

Mass = 0.3128mol * 2.0159 g/mol = 0.6306 g

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3 years ago

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B or D

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3 years ago

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lorasvet [3.4K]

Answer:

Here's what I find.

Explanation:

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Alpha particles cannot penetrate the skin, so external exposure isn't much of a health risk.

However, they are extremely dangerous when they are inhaled and get inside cells. They travel first to the blood or lymph system and later to the bone marrow and liver, where they cause up to 1000 times more chromosomal damage than beta or gamma rays.

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3 years ago