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3 years ago

Which is an unnecessary rule for writing chemical formulas?

Chemistry

1 answer:

balandron [24]3 years ago

7 0

The correct answer are

identify the positive ion and charge
balance the charges
identify the negative ion and charge

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What type of change is this picture showing?

sladkih [1.3K]

Answer: physical

Explanation: freezing and melting are physical changes.

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2 years ago

For ___, 2 lobes have positive signs while the other 2 have negative signs, showing that the opposite lobes of have same sign.

notsponge [240]

Answer:d orbitals

Explanation: just trustme

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2 years ago

A tank with volume of 2.4 cu ft is filled with Methane to a pressure of 1500 psia at 104 degrees F. Determine the molecular weig

Soloha48 [4]

Explanation:

It is known that equation for ideal gas is as follows.

PV = nRT

The given data is as follows.

Pressure, P = 1500 psia, Temperature, T = $104^{o}F$ = 104 + 460 = 564 R

Volume, V = 2.4 cubic ft, R = 10.73 $psia ft^{3}/lb mol R$

Also, we know that number of moles is equal to mass divided by molar mass of the gas.

n = $\frac{mass}{\text{molar mass}}$

m = $n \times W$

= $0.594 \times 16.04$

= 9.54 lb

Hence, molecular weight of the gas is 9.54 lb.

We will calculate the density as follows.

d = $\frac{PM}{RT}$

= $\frac{1500 \times 16.04}{10.73 \times 564}$

= 3.975 $lb/ft^{3}$

Now, calculate the specific gravity of the gas as follows.

Specific gravity relative to air = $\frac{\text{density of methane}}{\text{density of air}}$

= $\frac{3.975 lb/ft^{3}}{0.0765 lb/ft^{3}}$

= 51.96

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3 years ago

A(n) _____ is a natural object that orbits another object in the solar system besides the Sun.

Stolb23 [73]

The answer is the moon

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3 years ago

I NEED HELP FAST!!!!! Can you tell me about the development of the periodic table??? I have a DBA in a few minutes and I don't k

weqwewe [10]

Dimitri Mendeleev was the first to put elements together on a table. He knew there were elements missing but he noticed a trend in some of the elements known at the time. Sodium, Lithium and other alkali metals all have the same properties so he put them under the same column and created other columns with similar attributes (Halogens, Noble gases, Alkaline earth metals). Over the years, new elements were discovered and put into the rough outline that Mendeleev created.

I hope that is about what you wanted.

5 0

2 years ago