3 years ago

Which of these types of changes is a physical change?

Chemistry

2 answers:

Degger [83]3 years ago

7 0

The answer is a because the other ones are chemical

Leto [7]3 years ago

6 0

The correct answer is A. Can I get the Brainliest?

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What is the mass of 8.90 moles of magnesium chloride, MgCl2?

Mazyrski [523]

<span>(8.90/95.211) =0.09347 moles</span>

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3 years ago

Grace runs 6miles in 2 hours what is her speed??

MAXImum [283]

Speed = miles / time

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3 years ago

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An atom of aluminum has 13 protons and 14 neutrons. what is the atomic mass

PtichkaEL [24]

A=P +N
A=13+14
A=27 this the answer

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3 years ago

an unknown molecule is found to consist of 24.2% carbon by mass, 4.0% hydrogen by mass and the remaining mass is due to chlorine

Paha777 [63]

Answer:

C3 H6 Cl 3

Explanation:

C -24.2%

H - 4.0%

Cl - (100-24.2 - 4.0)=73.8 %

We can take 100g of the substance, then we have

C -24.2 g

H - 4.0 g

Cl - 73.8 g

Find the moles of these elements

C -24.2 g/12.0 g/mol =2.0 mol

H - 4.0 g/1.0 g/mol = 4. 0 mol

Cl - 73.8 g/ 35.5 g/mol = 2.1 mol

Ratio of these elements gives simplest formula of the substance

C : H : Cl = 2 : 4 : 2 = 1 : 2 : 1

CH2Cl

Molar mass (CH2Cl) = 1*12.0 +2*1.0 + 1*35.5 = 49.5 g/mol

Real molar mass = 150 g/mol

real molar mass/ Molar mass (CH2Cl) = 150 /49.5=3

So, Real formula should be C3 H6 Cl 3.

4 0

4 years ago

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Mass = 35g Volume = 7cm³ What is the Density?

gizmo_the_mogwai [7]

Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

$density = \frac{mass}{volume} \\$

From the question

mass = 35 g

volume = 7 cm³

The density is

$density = \frac{35}{7} \\$

We have the final answer as

Hope this helps you

7 0

3 years ago