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valkas [14]
3 years ago
10

Which statement about pure substances and molecules is correct?

Chemistry
1 answer:
ella [17]3 years ago
3 0

Answer:

all pure substance are molecules

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WILL MAKE BRAINEST
Elanso [62]
V=84.0 mL = 84.0 cm³
m=609.0 g

p=m/v

p=609.0/84.0=7.25 g/cm³
8 0
3 years ago
What two factors affect the pressure in a solid
grigory [225]

There are four main factors that can affect the reaction rate of a chemical reaction:

Reactant concentration. Increasing the concentration of one or more reactants will often increase the rate of reaction. ...

Physical state of the reactants and surface area. ...

Temperature. ...

Presence of a catalyst.

please make me brainlist answer

4 0
3 years ago
If 6.00 g of the unknown compound contained 0.200 mol of C and 0.400 mol of H, how many moles of oxygen, O, were in the sample?
Arada [10]

Convert moles to mass.

mass C = 0.2 mol * 12 g / mol = 2.4 g

mass H = 0.4 mol * 1 g / mol = 0.4 g

So mass left for O = 6 g – (2.4 g + 0.4 g) = 3.2 g

 

Calculating for moles O given mass:

moles O = 3.2 g / (16 g / mol) = 0.2 moles

 

Answer:

<span>0.2 moles O</span>

8 0
4 years ago
Read 2 more answers
What is the kinetic energy of a 25 kg object moving at a velocity of 2.5 m/s?
vovangra [49]

Answer:

<h2>78.13 J</h2>

Explanation:

The kinetic energy of an object can be found by using the formula

k =  \frac{1}{2} m {v}^{2}  \\

m is the mass

v is the velocity

From the question we have

k =  \frac{1}{2}  \times 25 \times  {2.5}^{2}  \\  = 12.5 \times 6.25 \\  = 78.125 \:  \:  \:  \:  \:  \:  \:  \:

We have the final answer as

<h3>78.13 J</h3>

Hope this helps you

6 0
3 years ago
What is the temperature 51°C expressed in kelvins?
Evgesh-ka [11]

Answer:

The answer is

<h2>324 K</h2>

Explanation:

To express a given temperature in degree Celsius to Kelvin simplify add 273 to the given value

That's

<h3>K = 273 + °C</h3>

where

K = Kelvin

°C = value in degree Celsius

From the question the value to be converted is 51°C

It's equivalent in Kelvin is

K = 273 + 51

We the final answer as

<h2>324 K</h2>

Hope this helps you

4 0
3 years ago
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