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Brrunno [24]
3 years ago
9

A substance that cannot be broken down into other substances by ordinary chemical procedures is an

Chemistry
1 answer:
Hatshy [7]3 years ago
5 0
An ELEMENT is a substance that cannot be broken down into other substances by ordinary chemical procedures.  Some easy examples would be:  <span>gold, iron, carbon, </span>hydrogen<span>, </span>oxygen<span>, nitrogen.</span> 
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Is it wierd if i think my step sis is thick
iren2701 [21]

Answer:

yes it is and sometimes it's not

8 0
2 years ago
Read 2 more answers
An experiment shows that a 250 ?ml gas sample has a mass of 0.430 g at a pressure of 736 mmhg and a temperature of 28 ?c.
dmitriy555 [2]
What we're looking for here is the gas sample's molar mass given its mass, pressure, volume, and temperature. Recalling the gas law, we have

PV = nRT or
n = \frac{PV}{RT}

where R is <span>0.08206 L atm / mol K, P is the given pressure, T is the temperature, and V is the volume.

Before applying the values given, it is important to make sure that they are to be converted to have consistent units with that of R. 
</span>
Thus, we have

P = 736/ 729 = 0.968 atm
T = 28 + 273.15 = 301.15 K
V = 250/1000 = 0.250 L

Now, applying these converted values into the gas law, we have

n = \frac{(0.968 atm)(0.250 L)}{(0.08206 L.atm/mol.K)(301.15 K)}
n = 0.00979 moles

Given that the mass of the sample is 0.430 g, we have

molar mass = \frac{mass}{number of moles} 
molar mass = \frac{0.430}{0.00979} = 43.9

Thus, the gas sample has a molar mass of 43.9 g/mol.
4 0
3 years ago
For the skeletal chemical equation
deff fn [24]

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4 0
3 years ago
Examine the statement about alchemy
Arturiano [62]

Answer: B.

Explanation:

7 0
3 years ago
Select all possible answers:
Dafna11 [192]

Answer:

c and d are correct

Explanation:

In A, false because in Valence Electrons, the more the valences, the more stable an atom is.

In B, false because atoms cannot readily gain or lose valence electrons as the number of valence electrons is determined by the column they are in.

In C, true because the more the valence electrons, the more the stability of an atom.  

In D, true as electron placing is important and the reactivity of an atom is important.

So C and D are true!

7 0
3 years ago
Read 2 more answers
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