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lys-0071 [83]
3 years ago
7

How many moles are there in 34.8 grams of Calcium?

Chemistry
1 answer:
olga55 [171]3 years ago
5 0

Answer:

Number of moles = 0.87 mol

Explanation:

Given data:

Mass of calcium = 34.8 g

Number of moles = ?

Solution:

Formula:

Number of moles = mass/molar mass

Molar mass of calcium = 40 g/mol

By putting values,

Number of moles = 34.8 g/ 40 g/mol

Number of moles = 0.87 mol

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Answer:

II) Objects made of silver become tarnished.

Explanation:

Physical properties are the properties which can be observed without changing identity of substance.

Chemical properties are the properties which describe how the substance changes into the different substance completely.

Boiling is an example of physical change in state of the substance. Color is also an example of physical property like boiling point and hence these are constants. The reason of the color is that the chromium ions shows certain colors as the electrons are excited due to absorption of the light. The tarnishing of the silver is an example of the chemical change which occurs due to the reaction of the silver with oxygen. This is also known as corrosion.

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3 years ago
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The answer is aldehyde
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Why can the geologic record be analyzed by looking at different rock layers?
nikklg [1K]

Answer:B

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6 0
3 years ago
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Is it possible for two different compounds to be made from the exact same two elements? Why or why not? With a limited number of
daser333 [38]

Answer:

Yes. The two elements can combine to form different compounds.

Explanation:

Two elements can combine at different ratios.

Consider CO and CO₂. Both are made from carbon and oxygen. However, C and O combine at a 1:1 ratio in CO but at a 1:2 ratio in CO₂. CO is a fuel; it burns in the air. CO₂ does not burn in the air; it is used to put out fires and is found in extinguishers. CO and CO₂ are two distinct compounds.

There are many ways for the elements to combine with each other. As a result, the first twenty elements on the periodic table alone can produce a large number of compounds.

6 0
3 years ago
a 6.7 volume of air, initially at 23 degrees celsius and .98 atm, is compressed to 2.7 L while heated to 125 degrees celsius. Wh
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Data:

V1 = 6.7 liter
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Formula:

Combined law of ideal gases: P1 V1 / T1 = P2 V2 / T2

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3 years ago
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