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lora16 [44]
3 years ago
15

According to cell theory _____.

Chemistry
1 answer:
bulgar [2K]3 years ago
4 0

Answer:

Every single living thing are comprised of cells. Cells are the fundamental units of structure and capacity in living things. New cells are delivered from existing cells.

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What three things does the atomic number of an element tell us?
ira [324]

Answer:

the number of protons in the nucleus of an atom. the number of protons define the identity of an element

3 0
1 year ago
What is the percentage composition of CF4
adoni [48]
The percentage composition of CF4 is %C = 13.64% and %F = 86.36% 

The solution are as follows:
Molar mass of CF4 = 88 
<span>molar mass of C = 12 </span>
<span>molar mass of F = 4x19 = 76 </span>

<span>% C = 12/88 x 100 = 13.64% </span>
<span>% F = 76/88 x 100 = 86.36%</span>
8 0
3 years ago
Read 2 more answers
"At constant pressure, the volume of a fixed amount of gas is directly proportional to its absolute temperature." This is -
Lostsunrise [7]

Answer: B

Explanation:

According to Charle's law, at constant pressure the volume of a fixed mass of a ga is directly proportional to its absolute temperature.

At constant pressure, V∝T.

6 0
3 years ago
Will a precipitate form (yes or no) when 50.0 ml of 1.2 × 10–3 m pb(no3)2 are added to 50.0 ml of 2.0 × 10–4 m na2s? if so, iden
frez [133]

Answer:

Yes, a precipitate of PbS forms

Explanation:

The equation of the reaction is given as:

                   Pb(NO₃)₂ + Na₂S → PbS + 2NaNO₃

The lead sulfide forms a precipitate in the aqeous solution.

Precipitation is a form of reaction in which ions combines to form a solid precipiate. Most double displacement reactions in which ionic compounds are the reactants results in formation of a precipitate as the product.

There are rules of solubility which guides a reaction that would lead to the formation of a precipitate. The mos applicable of the rules to the reaction stated above is that "carbonates, phosphates, sulfides, oxides and hydroxides are insolube". The sulfide of lead formed in the product is therefore insoluble.

8 0
3 years ago
Which of these substances are compounds? How do you know?
tankabanditka [31]
Salt because it's a solid and helium and nitrogen are gases.
Water is a liquid because it's form can change.
7 0
3 years ago
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