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4 years ago

Atomic number of f^-1

Chemistry

1 answer:

victus00 [196]4 years ago

7 0

The atomic number is 9 Ions have the same atomic number since atomic number signifies number of protons not electrons

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Which of the following is a physical property of matter

Black_prince [1.1K]

Answer: Physical properties of matter include color, hardness, malleability, solubility, electrical conductivity, density, melting point, and boiling point. For the elements, color does not vary much from one element to the next

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3 years ago

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One molecule of O2 is made of?

Arlecino [84]

Oxygen, and hydrogen

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4 years ago

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At STP, adding salt to a 200 mL sample of water produces a saturated 1.7 M solution. How many grams of salt (NaCl) must be added

Illusion [34]

Answer:

$m_{NaCl}=19.9gNaCl$

Explanation:

Hello!

In this case, since the formula for the calculation of molarity is:

$M=\frac{n}{V}$

Whereas we can compute the moles of the solute as shown below, making sure the volume is in liters:

$n=M*V$

Thus, by plugging in we obtain:

$n=0.200L*1.70mol/L=0.170molNaCl$

Next, since the molar mass of NaCl is 58.44 g/mol, we obtain the following mass:

$m_{NaCl}=0.170molNaCl*\frac{58.44gNaCl}{1molNaCl}\\\\m_{NaCl}=19.9gNaCl$

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3 years ago

A steel cylinder has a pressure of 550 torr at 177 degrees Celsius. What will be the pressure if the temperature is decreased by

Schach [20]

Answer:

$P_2=507.7torr$

Explanation:

Hello there!

In this case, when we have a gas that is undergoing a change in both pressure and temperature, we utilize the Gay-Lussac's equation as shown below:

$\frac{T_2}{P_2}=\frac{T_1}{P_1}$

Thus, since we are given the initial pressure and temperature and the final temperature, we can compute the final pressure as shown below:

$P_2=\frac{P_1}{T_1}*T_2$

So we plug in, by making sure the temperatures are in kelvins, to obtain:

$P_2=\frac{550torr}{(117+273)K}*(87+273)K\\\\P_2=507.7torr$

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8 0

3 years ago

In one sentence, explain how the particles of a substance change as a substance changes from a solid to a liquid to a gas.

mestny [16]

Answer:

An example would be ice.

Explanation:

Because ice starts off as a solid and then when it melts from heat turns into a liquid and then if heated can to into a gas.

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3 years ago