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ss7ja [257]
1 year ago
9

A and B are two imaginary substances. The molecules of substance A have weak electrical forces between them. The

Chemistry
1 answer:
GrogVix [38]1 year ago
7 0
I believe the answer is A, if they have a stronger connection lower the vapor pressure so higher the boiling point
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1. A 5.05 g sample of quartz (SiO2) contains 2.36 g of silicon. What are the percentages of silicon
hammer [34]

Answer: B) 46.7% Si and 53.3% O

Explanation:

To calculate the mass percent of element in a given compound, we use the formula:

\text{Mass percent of element}=\frac{\text{Mass of element}}{\text{total mass}}\times 100\%

Mass of quartz  (SiO_2) = 5.05 g

Mass of silicon = 2.36 g

Mass of oxygen = Mass of quartz  (SiO_2) - mass of silicon = 5.05g - 2.36 g = 2.69 g

\text{Mass percent of silicon}=\frac{\text{Mass of silicon}}{\text{total mass of quartz}}\times 100=\frac{2.36}{5.05}\times 100=46.7\%

\text{Mass percent of oxygen}=\frac{\text{Mass of oxygen}}{\text{total mass of quartz}}\times 100=\frac{2.69}{5.05}\times 100=53.3\%

Thus the percentages of silicon and oxygen in quartz are B) 46.7% Si and 53.3% O

6 0
3 years ago
Which statements describing chemical and nuclear reactions are true?
alexdok [17]

Answer is: 2. Chemical reactions involve the rearrangement of electrons and 5. Isotopes of the same element behave differently in a nuclear reaction.

1) The electrons of an atom participates in a chemical reaction.

2) Chemical reactions involve the rearrangement of electrons, because there is transfer, loss, gain and sharing of electrons in chemical reactions.

3) Nuclear reactions can produce new elements, because number of protons and neutrons is changed.

4) Chemical reactions require heat or an input of energy to occur, this is activation energy.

5) Isotopes of the same element behave differently in a nuclear reaction, because isotopes have different number of neutrons, so products of a nuclear reaction is different.

8 0
3 years ago
A solution with a ph of 6 has ________ times _________ oh- than a solution with a ph of 10.
Mila [183]
Answer would be... has  10 x^{-6- (-10)}= 10 x^{4} times concentration OH-
3 0
3 years ago
Which is not an important property of metal?
lukranit [14]
The answer is D solubility

hope this helps:)
3 0
3 years ago
Read 2 more answers
What is the density of a smaple if it weight 3.5 grams and has a volume of 2cm^3
Reil [10]
The density formula is:

density=mass/volume.

d=3.5g/2cm^3
d=1.75 g/cm^3

The density of the sample is 1.75 g/cm^3.
5 0
3 years ago
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