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blagie [28]
3 years ago
9

Which is a single ringed nitrogeo base? A)adenine B)guanine C)thymine D)ribose

Chemistry
1 answer:
pogonyaev3 years ago
3 0
A single ringed nitrogeo base is thymine (C)

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At STP, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver
alexdok [17]

Answer:

Silver

Explanation:

because it is a trasition metal and are good condutors

8 0
3 years ago
Given the following values for the heats of formation, what is the number of moles of ethane (C2H6, MW 30.0) required to produce
baherus [9]

Answer:

0.641 moles of ethane

Explanation:

Based on the equation:

C2H6(g) + 7/2O2(g) → 2CO2(g) + 3H2O(l)

We can determine ΔH of reaction using Hess's law. For this equation:

<em>Hess's law: ΔH products - ΔH reactants</em>

ΔH = {2ΔHCO2 + 3ΔHH2O} - {ΔHC2H6}

<em>Pure monoatomic substances have a ΔH = 0kJ/mol; ΔHO2 = 0kJ/mol</em>

<em />

ΔH = {2*-393.5kJ/mol + 3*-285.8kJ/mol} - {-84.7kJ/mol}

ΔH = -1559.7kJ/mol

That means when 1 mole of ethane is in combustion there are released 1559.7kJ of heat. To produce 1.00x10³kJ there are needed:

1.00x10³kJ * (1mole ethane / 1559.7kJ) =

<h3>0.641 moles of ethane</h3>
7 0
2 years ago
A molecule <br> B compound<br> C atom<br> D element
Svetllana [295]

Answer:

D. Element.

Explanation:

Atoms form elements. Elements form molecules. Molecules form compounds.

8 0
3 years ago
Which of the following results in a chemical change in matter?
LenKa [72]
The correct answer is 

D burning wood

because it's changing the wood.

The other's are physical changes because it's still the same thing, it's just in a different form.

Glad I could help, and good luck!

AnonymousGiantsFan
8 0
3 years ago
How much time would it take for 9000 atoms of nobellium-253 (half-life is 97 s) to decay to 2250 atoms?
Svetradugi [14.3K]

Answer:it’s 828292atoms

Explanation

7 0
3 years ago
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