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2 years ago

Which substance can not be decomposed by a chemical change?

Chemistry

2 answers:

Dvinal [7]2 years ago

7 0

Copper. It's copper because it is an element, not a compound substance, so its already in its basic chemical form ^u^

max2010maxim [7]2 years ago

5 0

B. Copper since the rest of the choices are compounds. Copper is an element.

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How many moles in 6.57 x 10^24 formula units of NaCl?

laiz [17]

Answer:

3.955*10^48

Explanation:

1 mole of a substance gives 6.02*10^23/6.57*10^24 will give x then cross multiply the answer. is 3.955*10^48

8 0

2 years ago

Which of these expressions are correct variations of the Combined Gas Law?

mafiozo [28]

Answer:

Both

Explanation:

The combined gas law is also known as the general gas law.

From the ideal gas law we assume that n = 1;

So;

PV = nRT

and then;

$\frac{P_{1}V_{1} }{T_{1} }$ = $\frac{P_{2}V_{2} }{T_{2} }$

If we cross multiply;

P₁V₁T₂ = P₂V₂T₁

So;

T₁ = $T_{2} \frac{P_{1}V_{1} }{P_{2} V_{2} }$

Also;

V₂ = $V_{1} \frac{P_{1} T_{2} }{P_{2} T_{1} }$

So from the choices both are correct

3 0

2 years ago

Plz hleeeeeeeeeep meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

andrezito [222]

Runoff (Hope this helped)

4 0

2 years ago

Which metals are called noble metals

Diano4ka-milaya [45]

I don't know if this is multiple choice but if it isn't I can name of few.

Fun Fact: Noble Metals are chemical elements that have outstanding tolerance and resistance to oxidation.

Answer: Palladium, Silver, Platinum, and Gold. Those are all examples of Noble Metals.

Other: Ruthenium, osmium, and rhodium.

Hope this helps!

6 0

2 years ago

What is the density of a 32g toy car that has a volume of 8cm3? A. 256alcm3 An3

Greeley [361]

Answer:

density=mass/volume

density=32/8

density=4

8 0

2 years ago