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3 years ago

What is the chemical formula for the ionic compound calcium chloride?

Chemistry

2 answers:

Juliette [100K]3 years ago

6 0

The answer to your question is,

B) CaCl2

-Mabel <3

forsale [732]3 years ago

3 0

B) is the accurate answer for the chemical formula

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If element X has 65 protons, how many electrons does it have

Tomtit [17]

In an atom there are the same number of protons as electrons to start with. The answer would be 65 aswell.

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3 years ago

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The amount of nitrogen in an organic substance can be determined by an analytical method called the Kjeldahl method, in which al

Solnce55 [7]

Answer:

The mass percentage of nitrogen in the sample is 1.96%.

Explanation:

$Moles (n)=Molarity(M)\times Volume (L)$

21.0 mL of 0.150 M HCl

Moles of hydrogen chloride = n

Volume of hydrogen chloride solution = 21.0 mL = 0.021 L

Molarity of the hydrogen chloride = 0.150 M

$n=0.150 M\times 0.021 L=0.00315 mol$

$NH_3 (aq) + HCl(aq)\rightarrow NH_4Cl ( aq )$

According to recation, 1 mole of HCl neutralizes 1 mole ammonia.Then 0.00315 moles of HCl will neutrtalize:

$\frac{1}{1}\times 0.00315 mol=0.00315 mol$ of ammonia

1 mole of ammonia has 1 mole of nitrogen atom . Then 0.00315 moles of ammonia will have = 1 × 0.00315 mol = 0.00135 mol

Mass of 0.00315 moles of nitrogen= 0.00315 mol × 14 g/mol = 0.0441 g

Mass of the sample = 2.25 g

The mass percentage of nitrogen in the sample:

$\%=\frac{0.0441 g}{2.25 g}\times 100=1.96\%$

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2 years ago

Carbon is considered which of the following?

Zarrin [17]

Answer: atomic element

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1 year ago

Susan conducts an experiment five times and gets a solution concentration of 1.9M, 2.1M, 1.8M, 1.9M, and 2.2M. The known concent

vlada-n [284]

Answer:

This question is incomplete; the complete part/options is:

A) They are precise, but not accurate.

B) They are accurate, but not precise.

C) They are both accurate and precise.

D) They are neither accurate nor precise

The answer is C.

Explanation:

Accuracy refers to how close a series of measurements is to a known or true value while precision is the closeness of the measurements to one another.

The known concentration of a solution is 2.0M. In an experiment which Susan conducts five times and gets a solution concentration of 1.9M, 2.1M, 1.8M, 1.9M, and 2.2M respectively.

Based on these measured solute concentrations, one would observe that the measured values of: 1.9M, 2.1M, 1.8M, 1.9M, 2.2M are close to one another. This means that the measurements are PRECISE.

Also, the measured values are not too distant from the known value of 2.0M, hence, it can be said that the measurements are ACCURATE.

Therefore, Susan's measurements of the solute concentration are both accurate and precise.

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3 years ago

What is the universe made of?

brilliants [131]

Methane, nitrogen, dark matter, and radiation.

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3 years ago

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