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Allisa [31]
3 years ago
13

Pls help me

Chemistry
2 answers:
kipiarov [429]3 years ago
7 0

Answer:

D. Protons

Explanation:

S_A_V [24]3 years ago
5 0
The answer is the number of protons.

explanation: The number of protons in one atom of an element determines the atoms identity, and the number of electrons determines its electrical charge.
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The given formula for heat, Q=mc(Tf-Ti), is the best way to solve such problems with changes in temperature. It can be said that m is the mass of the substance. C is the specific heat of the substance. The term (Tf-Ti) is the change in temperature.

Q = mc(Tf-Ti) = 480g(0.96 J/g-C)(234-22) = 97689.6 Joules of heat
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3 years ago
How is the accuracy of the oxygen determination affected by the addition of a gas into the stream that is reduced by a reaction
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Answer:

Decreased because the method can not distinguish oxygen from the gas added

Explanation:

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3 years ago
2. A rock occupies a volume of 20 cm and has a mass of 54 grams. Find the density of<br> this rock.
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The answer is 2.7gm/cm^3 . Density is mass divided by volume .
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3 years ago
What is 1006 in scientific notation?
vladimir1956 [14]

Answer:

1.006 * 103

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8 0
3 years ago
People take antacids, such as milk of magnesia, to reduce the discomfort of acid stomach or heartburn. The recommended dose of m
Llana [10]

Answer:

V_{HCl}=0.208L=208mL

Explanation:

Hello,

In this case, since the chemical reaction is:

2HCl+Mg(OH)_2\rightarrow MgCl_2+2H_2O

We can see that hydrochloric acid and magnesium hydroxide are in a 2:1 mole ratio, which means that the neutralization point, we can write:

n_{HCl}=2*n_{Mg(OH)_2}

In such a way, the moles of magnesium hydroxide (molar mass 58.3 g/mol) in 500 mg are:

n_{Mg(OH)_2}=500mg*\frac{1g}{1000mg}*\frac{1mol}{58.3g}  =0.00858mol

Next, since the pH of hydrochloric acid is 1.25, the concentration of H⁺ as well as the acid (strong acid) is:

[H^+]=[HCl]=10^{-pH}=10^{-1.25}=0.0562M

Then, since the concentration and the volume define the moles, we can write:

[HCl]*V_{HCl}=2*n_{Mg(OH)_2}

Therefore, the neutralized volume turns out:

V_{HCl}=\frac{2*0.00858mol}{0.0562\frac{mol}{L} }\\ \\V_{HCl}=0.208L=208mL

Best regards.

3 0
3 years ago
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