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3 years ago

you are studying an element that is a gas at room temperature. Is it most likely a metal, nonmetal, or metalloid?

Chemistry

2 answers:

konstantin123 [22]3 years ago

8 0

Nonmetal, for example, the Noble Gases, or Hydrogen.

Grace [21]3 years ago

3 0

It is 100% Nonmetal, why? Because gas is not metallic (so that crosses out metals and metalloids), and can't conduct, in any way.

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What is the [H₃O⁺] (hydronium concentration) of an aqueous solution that has a pH of 4.00?

Rudik [331]

Answer: 0.0001M

Explanation:

Given that:

[H₃O⁺] (hydronium concentration) = ?

pH of aqueous solution = 4.00

pH is the negative logarithm of hydrogen ion [H+] or hydroxonium ion [H₃O⁺] in a solution. Mathematically it is expressed as:

pH = -log[H₃O⁺]

4.00 = -log[H₃O⁺]

[H₃O⁺] = Antilog (-4.00)

[H₃O⁺] = 0.0001M

Thus, 0.0001M is the [H₃O⁺] (hydronium concentration) of an aqueous solution that has a pH of 4.00

8 0

3 years ago

Mixing a cocktail is it a physical or chemical change

sergiy2304 [10]

It is a physical change.

3 0

3 years ago

"An aqueous CaCl2 solution has a vapor pressure of 83.1mmHg at 50 ∘C. The vapor pressure of pure water at this temperature is 92

Lynna [10]

Answer : The the concentration of $CaCl_2$ in mass percent is, 41.18 %

Solution : Given,

Molar mass of water = 18 g/mole

Molar mass of $CaCl_2$ = 110.98 g/mole

First we have to calculate the mole fraction of solute.

According to the relative lowering of vapor pressure, the vapor pressure of a component at a given temperature is equal to the mole fraction of that component of the solution multiplied by the vapor pressure of that component in the pure state.

$\fac{p^o-p_s}{p^o}=X_B$

where,

$p^o$ = vapor pressure of the pure component (water) = 92.6 mmHg

$p_s$ = vapor pressure of the solution = 83.1 mmHg

$X_B$ = mole fraction of solute, $(CaCl_2)$

Now put all the given values in this formula, we get the mole fraction of solute.

$\fac{92.6-83.1}{92.6}=X_B$

$X_B=0.102$

Now we have to calculate the mole fraction of solvent (water).

As we know that,

$X_A+X_B=1\\\\X_A=1-X_B\\\\X_A=1-0.102\\\\X_A=0.898$

The number of moles of solute and solvent will be, 0.102 and 0.898 moles respectively.

Now we have to calculate the mass of solute, $(CaCl_2)$ and solvent, $(H_2O)$ .

$\text{Mass of }CaCl_2=\text{Moles of }CaCl_2\times \text{Molar mass of }CaCl_2$

$\text{Mass of }CaCl_2=(0.102mole)\times (110.98g/mole)=11.32g$

$\text{Mass of }H_2O=\text{Moles of }H_2O\times \text{Molar mass of }H_2O$

$\text{Mass of }H_2O=(0.898mole)\times (18g/mole)=16.164g$

Mass of solution = Mass of solute + Mass of solvent

Mass of solution = 11.32 + 16.164 = 27.484 g

Now we have to calculate the mass percent of $CaCl_2$

$Mass\%=\frac{\text{Mass of}CaCl_2}{\text{Mass of solution}}\times 100=\frac{11.32g}{27.484g}\times 100=41.18\%$

Therefore, the the concentration of $CaCl_2$ in mass percent is, 41.18 %

4 0

2 years ago

Which statement best describes the oxidation numbers of the atoms found in magnesium chloride? A. Magnesium has a 2- oxidation n

In-s [12.5K]

B. is the correct answer of your question

6 0

3 years ago

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Acceleration usually has the symbol a. It is a vector. What is the correct way

BaLLatris [955]

Answer:

Explanation:

it has an arrow symbolizing direction because a vector quantity has both magnitude and direction.

3 0

3 years ago

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