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4 years ago

6

5487129m to three significant figures

1 answer:

pav-90 [236]4 years ago

4 0

Answer:

549,000m

Explanation:

In this case, three significant figures means that everything below the first three digits of the number is rounded to zeroes, with the 8 being rounded up to a nine as 7 is closer to 10 than it is to 0

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Element compound2. Select all the compounds from the following elements

bulgar [2K]

<u>Answer:</u> $Fe_2O_3$ and $C_2H_4O_2$ are the compounds.

<u>Explanation:</u>

A chemical compound is defined as a chemical substance that is formed by the combination of two or more atoms of different elements which cannot be separated by any physical means but when chemically treated, they decompose into their parent elements.

For example, water is made up of hydrogen and oxygen. This compound is a liquid and its individual components are gases. When water is decomposed, it forms hydrogen and oxygen gas.

For the given options:

He(Helium) is an element formed by the combination of only type of atoms.

$O_2$ and $P_4$ are molecules of same element.

$Fe_2O_3$ is a compound fomed by the combination of iron and oxygen atoms.

$C_2H_4O_2$ is a compound fomed by the combination of carbon, hydrogen, and oxygen atoms.

Hence, $Fe_2O_3$ and $C_2H_4O_2$ are the compounds.

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3 years ago

When identifying minerals, scientists often look at the color of the mineral when it is in powdered form. What is this color cal

Dmitry [639]

Answer:

the streak of the mineral

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4 years ago

a sample of the hydrate of sodium carbonate has a mass of 8.85 g. it loses 1.28 g when heated. find the molar ratio of this comp

xenn [34]

Answer:

Molar ratio of the compound is 1:1 and the type of hydrate is Mono hydrate.

Explanation:

From the given,

Mass of sodium carbonate $Na_{2}CO_{3}.XH_{2}O$ = 8.85 g

Loss mass $H_{2}O$ = 1.28 g

Actual weight of sodium carbonate = 8.85 g - 1.28 g = 7.57 g

$7.57 g Na_{2}CO_{3} \times \frac{1mol}{106 g} =\frac{0.0714}{0.0714}=1$

$1.28g H_{2}O \times \frac{1mol}{18 g} =\frac{0.0711}{0.0714}=1$

Therefore, the compound has only one water molecule.

Molecular formula of the compound is $Na_{2}CO_{3}.H_{2}O$ an name of the compound is <u>sodium carbonate mono hydrate.</u>

Hence, the type of the compound is Mono hydrate.

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3 years ago

What happens to the energy of gas particles when an elastic collision takes place?

julia-pushkina [17]

The answer is D because there is no forces of attraction or repulsion between gas particles .

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Write the symbol of the element that has an electron configuration of 1s22s22p6.

antoniya [11.8K]

Neon is the element - Ne the symbol

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