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4 years ago

What does percent composition tell you about a substance

Chemistry

2 answers:

dexar [7]4 years ago

7 0

Explanation:

Percentage composition tells you the percentage of each element present in a compound or molecule. This allows you to work out the number of atoms of each element present in the molecule. Percent composition is important because it allows us to determine the percentage of each element that makes up a specific compound. Percent composition is important because it allows us to determine the percentage of each element that makes up a specific compound.

Snowcat [4.5K]4 years ago

7 0

Answer:

It tells you what the substance is made of.

Explanation:

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An atom of calcium contains 20 protons how many electrons does it have

harina [27]

20.

Atomic number is equivalent to its protons and electrons. :)

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3 years ago

Give the nuclear symbol for the isotope of potassium for which a=40?

KATRIN_1 [288]

nuclear symbol consists of three parts: 1. the symbol of the element; 2. the atomic number of the element;3. the mass of the element. for the above problem, the symbol for potassium is k. it's atomic number is 40. the number of protons is 19. so we denote this in the following nuclear symbol; 40 k 19

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3 years ago

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__is when two genetic sequences bind together because of the hydrogen bonds that form between the base pairs

Anettt [7]

Answer:

I would say that it is the bond called complementary hydrogen bonds

Explanation:

The nucleotides in a base pair are complementary which means their shape allows them to bond together with hydrogen bonds. The A-T pair forms two hydrogen bonds. The C-G pair forms three. The hydrogen bonding between complementary bases holds the two strands of DNA together.

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3 years ago

Which Of These Is An Indication That A Chemical Reaction Has Occurred?

nikdorinn [45]

Answer:

Correct option is D. Formation Of A Gas

Explanation

The main indication of chemical is that new substances are formed which have different composition than reactant.

Freezing of a substance: As in this case composition remained same, so we cant say, chemical reaction is take place, like when water freezes, it composition is same as water , so it is only its physical properties, not chemical.

Melting of a substance: As in this case composition remained same, so we cant say, chemical reaction is take place, like when ice melts, composition of water remained same , so it its physical properties, not chemical.

Boiling of a substance: As in this case composition remained same, so we cant say, chemical reaction is take place, like when water boils and become vapors, composition of water and vapors remained same , so it its physical properties, not chemical properties which show its chemical reaction.

Formation of gas:

In this case, chemical reaction take place. In chemical reactions, new substance are formed whose composition is different from reactants.

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3 years ago

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All elements in the same group A) have similar chemical properties. B) are not similar in any way. C) are in the same state at r

leva [86]

Answer:

Have similar chemical properties

Explanation:

The periodic table of elements is made up of groups or families and periods.
Elements in the same group or chemical family share similar chemical properties.
For example, elements in group II have similar chemical properties. They include Calcium and magnesium.
A similar chemical property of group II elements is that they react with water to form metal hydroxide and hydrogen gas.

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3 years ago

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