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kvasek [131]
3 years ago
13

Which of the following is a strong acid?

Chemistry
1 answer:
Leokris [45]3 years ago
3 0

Answer:

A) HCI( hydrochloric acid)

Explanation:

HCI is a strong acid because it has more number of hydrogen ions whereas acetic acid contains less number of hydrogen ions so its a weak acid

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Which statement describes how a basic coffee cup calorimeter works? A) It measures the mass of a substance given the specific he
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A calorimeter experiment is a set-up that provides insulation so that no heat escapes to the surroundings and all energy can be accounted for. It can be done at either constant volume or constant pressure. So, the answer to this is knowing the mass of water, the specific heat which is an empirical data, and the change in temperature which can be measured using a thermometer. This experiment could measure the mass of an unknown substance added or the specific heat of the substance or the calorimeter. <em>The answer is D.</em>
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3 years ago
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A sample of metal has a mass of 24.64 g, and a volume of 5.91 mL. What is the density of this metal?
dlinn [17]

Answer:

\boxed {\boxed {\sf 4.17 \ g/mL}}

Explanation:

We are asked to find the density of a metal. Density is the mass per unit volume. It is calculated by dividing the mass by the volume.

\rho= \frac{m}{v}

The mass of the metal sample is 24.64 grams and the volume is 5.91 milliliters. We can substitute these values into the formula.

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\rho=\frac{24.64 \ g }{5.81 \ mL}

Divide.

\rho= 4.169204738 \ g/mL

The mass measurement has 4 significant figures the volume measurement has 3 significant figures. Our answer for density must match the least number of significant figures, which is 3.

For the number we calculated, that is the hundredth place. The 9 in the thousandth place tells us to round the 6 up to a 7.

\rho \approx 4.17 \ g/mL

The density of this metal is approximately <u>4.17 grams per milliliter.</u>

3 0
3 years ago
Consider this reaction: 2Al(s) + 3 CuCl2(aq) → 2AlCl3(aq) + 3 Cu(s) If the concentration of CuCl2 drops from 1.000 M to 0.655 M
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Answer:

r=-0.0115M/s

Explanation:

Hello,

In this case, the rate is computed as:

r=\frac{C_F-C_0}{T_F-T_0}

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r=\frac{0.655M-1.000M}{30s-0s}=-0.0115M/s

Which negative since the cupric chloride is a reagent.

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432 inches

Each project is 9 feet, and she is making 4 projects, so multiply 9 by 4 to find the number of feet needed. You should get 36. Each foot is equal to 12 inches, so multiply 36 by 12 to get 432 inches.

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Science!
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Answer:

Radiation, because the element of the heater comes in contact with air in the room. Convection, because energy is carried by waves and not matter. Radiation, because heat travels in a cyclical manner.

Explanation:

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