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3 years ago

What is an example of a physical change involving iron and a chemical change involving iron?

2 answers:

6 0

Chemical change: is any change the results formation of new chemical substances Physical changes: rearranged molecules but affect internal structures

Sunny_sXe [5.5K]3 years ago

6 0

The chemical change of iron would be iron rusting because it a chemical change. Explain it ahah i gotcha its chemical because iron will react to oxygen and for rust which is a new substance.

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Is an apple seed a compound or a mixture?

vaieri [72.5K]

Answer:

Compound

Explanation:

compound: Substance that is made up of more than one type of atom bonded together

mixture: a combination of two or more elements of compound which are not chemically bonded

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3 years ago

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Which property of waves is the distance between one point on a wave and that same point on the wave next to it?

mr Goodwill [35]

The answer is B, wavelength

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3 years ago

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What is the molar mass of 81.50 g of gas

garik1379 [7]

The molar mass of gas = 238.29 g/mol

<h3>Further explanation</h3>

Given

mass = 81.5 g

P=1.75 atm

V=4.92 L

T=307 K

Required

molar mass

Solution

The gas equation can be written

$\large{\boxed{\bold{PV=nRT}}$

$\tt n=\dfrac{mass}{molar~mass}$

So the equation becomes :

$\tt Molar~mass=\dfrac{mRT}{PV}$

Input the value :

$\tt M=\dfrac{81.5\times 0.082\times 307}{1.75\times 4.92}\\\\M=238.29~g/mol$

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2 years ago

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Combustion of coal releases sulfur dioxide into the atmosphere. The following process converts this gas into sulfuric acid, a co

Usimov [2.4K]

Answer:

$m=7.07gH_{2}SO_{4}$

Explanation:

1. Take in account the sulfuric acid at STP:

$1840\frac{g}{L}$

2. Density is expressed as the ratio between the mass and the volume of a substance so:

$d=\frac{m}{V}$

Solving for m:

$m=\frac{V}{d}$

3. Replace values:

$m=\frac{1.30*10^{4}L}{1840\frac{g}{L}}$

$m=7.07gH_{2}SO_{4}$

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3 years ago

Which statement best describes how Carl Woese changed the system of classification?

Nadya [2.5K]

Answer: C.)

Explanation:

i got it right on a unit test!

but it might be something else if there arranged different!

sorry!

8 0

3 years ago

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