CHEMISTRY HIGH SCHOOL

Which substance does not obey the Lewis octet rule?(a) N₂
(b) NO
(c) CF₄
(d) Ar

Can anyone explain this?

Answers

Answer 1
Answer: I can tell you that the first five elements of the periodic table does not obey the octet rule. The only reason for that is because they are trying to be like their closest noble gas which will be helium in this case.

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Look at the chemicals listed below and answer the questions . ironwater
sand
oxygen
gold
carbon dioxide
helium
carbon
rust
seawater
1. Name the two metals
2.Name a gas that is not an element
3.Name a mixture
4.Name a non metallic element that is a solid .​

Answers

Answer:

1. gold and rust

2. carbon dioxide

3. sea water

4. carbon

Answer:

1. Gold and Iron

2. Helium

3. Seawater

4.Rust

Explanation:

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. Which is most likely to result in the greatest amount of error in their scientific experiment?

Answers

Since you don't have any choices presented for the question, I'll just proceed on discussing possible errors that would be made in this scientific experiment.

The errors could root from:
-measurement of the thickness incosistently (at different times of the day)
-the instrument used is different in each measurement
-no regard of significant figures
-standard deviation from the mean is not calculated and not propagated

After being thoroughly stirred at 10.°C, which mixture is heterogenous?(1) 25.0 g of KCl and 100. g of H2O(2) 25.0 g of KNO3 and 100. g of H2O
(3) 25.0 g of NaCl and 100. g of H2O
(4) 25.0 g of NaNO3 and 100. g of H2O

Answers

The answer is (2) KNO3. This depends on the solubility of these four compounds at 10℃. For NaCl, it is 35.8 g, For NaNO3, 80.8 g. KCl, 31.2 g. KNO3, 21.9g. So only KNO3 is less than 25.0 g.

Answer:

2

Explanation:

Because if look at the Solubity curves you will notice other three doesn't go 25 grams. They start above the 25 grams.

Find the molarity of the following solutions: 0.5 moles of sodium chloride is dissolved to make 0.05 liters of solution.

Answers

M(molarity)=moles/volume
M=.5mol/.05L=10M

The percent composition by mass of certain compound is 35.5 percent carbon, 4.8 percent hydrogen, 37.9 percent oxygen, 8.3 percent nitrogen, and 13.5 percent sodium. What is the molecular formula if the molar mass is roughly 170 grams per mole

Answers

Answer:

C_(5)H_(8)NNaO_(4)

Explanation:

Moles =\frac {Given\ mass}{Molar\ mass}

% of C = 35.5

Molar mass of C = 12.0107 g/mol

% moles of C = (35.5)/(12.0107) = 2.95569

% of H = 4.8

Molar mass of H = 1.00784 g/mol

% moles of H = (4.8)/(1.00784) = 4.76266

% of N = 8.3

Molar mass of N = 14.0067 g/mol

% moles of N = (8.3)/(14.0067) = 0.59257

% of Na = 13.5

Molar mass of Na = 22.989769 g/mol

% moles of N = (13.5)/(22.989769) = 0.58721

% of O = 37.9

Molar mass of O = 15.999 g/mol

% moles of O = (37.9)/(15.999) = 2.36889

Taking the simplest ratio for C, H, O, N, Na and O as:

2.95569 : 4.76266 : 0.59257 :  0.58721 : 2.36889

= 5 : 8 : 1 : 1 : 4

The empirical formula is = C_(5)H_(8)NNaO_(4)

Molecular formulas is the actual number of atoms of each element in the compound while empirical formulas is the simplest or reduced ratio of the elements in the compound.

Thus,  

Molecular mass = n × Empirical mass

Where, n is any positive number from 1, 2, 3...

Mass from the Empirical formula = 12*5 + 1*8 + 14 + 23 + 16*4 = 169 g/mol

Molar mass = 170 g/mol

So,  

Molecular mass = n × Empirical mass

170 = n × 169

⇒ n ≅ 1

The molecular formula = C_(5)H_(8)NNaO_(4)

Answer : The molecular formula of a compound is, C_5H_8O_4NNa

Solution :

If percentage are given then we are taking total mass is 100 grams.

So, the mass of each element is equal to the percentage given.

Mass of C = 35.5 g

Mass of H = 4.8 g

Mass of O = 37.9 g

Mass of N = 8.3 g

Mass of Na = 13.5 g

Molar mass of C = 12 g/mole

Molar mass of H = 1 g/mole

Molar mass of O = 16 g/mole

Molar mass of N = 14 g/mole

Molar mass of Na = 23 g/mole

Step 1 : convert given masses into moles.

Moles of C = \frac{\text{ given mass of C}}{\text{ molar mass of C}}= (35.5g)/(12g/mole)=2.96moles

Moles of H = \frac{\text{ given mass of H}}{\text{ molar mass of H}}= (4.8g)/(1g/mole)=4.8moles

Moles of O = \frac{\text{ given mass of O}}{\text{ molar mass of O}}= (37.9g)/(16g/mole)=2.37moles

Moles of N = \frac{\text{ given mass of N}}{\text{ molar mass of N}}= (8.3g)/(14g/mole)=0.593moles

Moles of Na = \frac{\text{ given mass of Na}}{\text{ molar mass of Na}}= (13.5g)/(23g/mole)=0.587moles

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C = (2.96)/(0.587)=5.0\approx 5

For H = (4.8)/(0.587)=8.1\approx 8

For O = (2.37)/(0.587)=4.0\approx 4

For N = (0.593)/(0.587)=1.0\approx 1

For Na = (0.587)/(0.587)=1

The ratio of C : H : O : N : Na = 5 : 8 : 4 : 1 : 1

The mole ratio of the element is represented by subscripts in empirical formula.

The Empirical formula = C_5H_8O_4N_1Na_1=C_5H_8O_4NNa

The empirical formula weight = 5(12) + 8(1) + 4(16) + 1(14) + 1(23) = 169 gram/eq

Now we have to calculate the molecular formula of the compound.

Formula used :

n=\frac{\text{Molecular formula}}{\text{Empirical formula weight}}

n=(170)/(169)=1

Molecular formula = (C_5H_8O_4NNa)_n=(C_5H_8O_4NNa)_1=C_5H_8O_4NNa

Therefore, the molecular of the compound is, C_5H_8O_4NNa

What does inertia depend on??

Answers

Inertia depends on the mass of an object. 

It depends on a mass of an object.
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