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4 years ago

Which compound is an acid? A. C2H4 B. KCl C. NH3 D. HNO3

Chemistry

2 answers:

Katyanochek1 [597]4 years ago

5 0

Nitric acid is option D.

Musya8 [376]4 years ago

4 0

D. HNO3 is the compound that is an acid.

Glad to help.

-Jurgen

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40.00 mL of 0.10 M KOH solution is titrated by 30.00 mL of 0.10 M HCl (adding HCl to KOH). What is the pH of the solution in the

Natali5045456 [20]

Answer:

$pH=12.16$

Explanation:

The alkaline solution:

40 ml of 0.1 M KOH

$n_{KOH}=\frac{1 L}{1000mL}*40mL*0.1M=0.004 mol$

The acid solution:

30 ml of 0.1 M HCl

$n_{HCl}=\frac{1 L}{1000mL}*30mL*0.1M=0.003 mol$

The neutralization reaction:

$HCl + KOH \longrightarrow KCl + H_2O$

For 1 mol of HCl, 1 mol of KOH is consumed. If 0.003 mol of HCl are added, 0.003 mol of KOH reacted.

After titration:

$n_{KOH}=0.001 mol$

$n_{HCl}= 0 mol$

Concentration (don't forget to add the volumes)

$n_{KOH}=\frac{1 1000mL}{1L *70mL}*0.001 mol=0.0143 mol$

Calcualtion of the pOH:

$pOH=-log([OH^-])=-log(0.0143)=1.84$

For the pH:

$pH=14-pOH=14-184=12.16$

4 0

3 years ago

Which of the following statements are true about metallic bonds?

Alborosie

Answer:

B. They bond identical atoms together

Explanation:

Metallic Bond: This is the bond that exists among the atoms of the metal. This is a type of electrostatic attraction between conduction electrons of metallic atom and their positively charged metal ions.

(figure attached)

Example:

Copper is a metallic element and its atoms consist of metallic bond among their selves.

Options A, B, D are not correct as all states for a kind of ionic bond formation.

Ionic bond:

It form by the complete transfer of electron from one atom to other

It is formed among two atoms of different electronegativities.

Also metals are electro-positive and non -metals are electro-negative so they form ionic bond.

Example is NaCl where sodium is a metal and Chloride is non-metal and they from ionic bond.

7 0

3 years ago

Suppose you have 300.0 mL of a 0.450 M sodium hydroxide solution.

icang [17]

Answer:

135 moles

Explanation:

300*0.45

= 135

PLS GIVE BRAINLIEST

7 0

3 years ago

Read 2 more answers

Assume that your empty crucible weighs 15.98 g, and the crucible plus the sodium bicarbonate sample weighs 18.56 g. After the fi

Savatey [412]

The question is incomplete, the complete question is;

Assume that your empty crucible weighs 15.98 g, and the crucible plus the sodium bicarbonate sample weighs 18.56 g. After the first heating, your crucible and contents weighs 17.51 g. After the second heating, your crucible and contents weighs 17.50 g.

What is the theoretical yield of sodium carbonate?

What is the experimental yield of sodium carbonate?

What is the percent yield for sodium carbonate?

Which errors could cause your percent yield to be falsely high, or even over 100%?

Answer:

See Explanation

Explanation:

We have to note that water is driven away after the second heating hence we are concerned with the weight of the pure dry product.

Hence;

From the reaction;

2 NaHCO3 → Na2CO3(s) + H2O(l) + CO2(g)

Number of moles of sodium bicarbonate = 18.56 - 15.98 = 2.58 g/87 g/mol

= 0.0297 moles

2 moles of sodium bicarbonate yields 1 mole of sodium carbonate

0.0297 moles of 0.015 moles sodium bicarbonate yields 0.0297 * 1/2 = 0.015 moles

Theoretical yield of sodium carbonate = 0.015 moles * 106 g/mol = 1.59 g

Experimental yield of sodium bicarbonate = 17.50 g - 15.98 g = 1.52 g

% yield = experimental yield/Theoretical yield * 100

% yield = 1.52/1.59 * 100

% yield = 96%

The percent yield may exceed 100% if the water and CO2 are not removed from the system by heating the solid product to a constant mass.

5 0

3 years ago

Which pair of elements below have +3 ionic change? A. Al and Ga B. Sc and Y

Vsevolod [243]

B I think Im not sure

3 0

3 years ago