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3 years ago

What are the main classifications or categories of elements in the periodic table?

1 answer:

5 0

Alkali metals, Alkaline Earth metals, Transition metals, Basic metals, semi metals or metalloids, Non-metals, Halogens, Noble gases, Lanthanides and Actinides.

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Atomic emission spectroscopy and the method of standard addition are used to determine the Na+ concentration and its uncertainty

Bess [88]

Answer:

atomic nuts are INCREDIBLE

Explanation:

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4 years ago

The molar mass of carbon dioxide is 44.0 g/mol. How many moles of CO2 are present in a 58.4 gram sample of CO2

inessss [21]

Answer:

1.33 moles CO2

Explanation:

The number you are converting is 58.4 g CO2, so you start with this value. The conversion factor is 44.0 g/mol CO2. In order to cross out the grams, the grams must go on the bottom of the conversion factor.

1 mol CO2
58.4 g CO2 x -------------------------- = 1.33 moles CO2
44.0 grams

The answer has three sig figs.

3 0

2 years ago

You are assembling cars, and your job is to put the wheels on the vehicles. You have 3520 wheels, 14040 nuts ( 4 nuts per wheel)

Romashka [77]

I think u should divide the number by 2 i think.

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3 years ago

Of the following gases, ________ will have the greatest rate of effusion at a given temperature. Of the following gases, _______

kolezko [41]

<u>Answer:</u> From the given gases, the greatest rate of effusion is of $CH_4$

<u>Explanation:</u>

Rate of effusion of a gas is determined by a law known as Graham's Law.

This law states that the rate of effusion or diffusion of a gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows:

$\text{Rate of diffusion}\propto \frac{1}{\sqrt{\text{Molar mass of the gas}}}$

It is visible that molar mass is inversely related to rate of effusion. So, the gas having lowest molar mass will have the highest rate of effusion.

For the given gases:

Molar mass of $NH_3=17g/mol$

Molar mass of $HCl=36.5g/mol$

Molar mass of $CH_4=16g/mol$

Molar mass of $Ar=40g/mol$

Molar mass of $HBr=81g/mol$

The molar mass of methane gas is the lowest. Thus, it will have the greatest rate of effusion.

Hence, the greatest rate of effusion is of $CH_4$

8 0

4 years ago

Defined as the negative logarithm of the concentration of OH-

Marat540 [252]

Answer:

As with the hydrogen-ion concentration, the concentration of the hydroxide ion can be expressed logarithmically by the pOH. The pOH of a solution is the negative logarithm of the hydroxide-ion concentration. pOH=−log[OH−] The pH of a solution can be related to the pOH.

4 0

4 years ago