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lawyer [7]
3 years ago
12

PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!

Chemistry
1 answer:
Novosadov [1.4K]3 years ago
6 0

1.) Which of the following is a molecule but not a compound?

A.He

"He" or helium is an initial for a single element and a compound has more than one element.

2.) What is a physical combination of substances?

A.a mixture

When two substances are combined they result in a compound.

3.) What is a chemical combination of substances?

A. they form a compound

When two chemical elements are combined they form a compound.

4.) What is the relationship between the solute and solvent in a solution?

B.they form a mixture

Solutes are dissolved into the solvent which results in a mixture.

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Which structural formula represents an unsaturated hydrocarbon?
bija089 [108]

Answer:

4

Explanation:

your chosen answer is right as unsaturated mean contains double bond and 1st and 3rd is Wrong as Carbon only can have 4 bonds and 2nd is Wrong as it is saturated.

hope this helps :)

5 0
3 years ago
Which of the following are greenhouse gases? Select all that apply. Oxygen, carbon dioxide, nitrous oxide, nitrogen
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Carbon dioxide and nitrous oxide
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Which of the following statements is true for an exothermic reaction?
shutvik [7]
The enthalpy change for an exothermic reaction is negative because heat is being released, so that takes out two of the responses. Since energy is being released into the surroundings due to the exothermic reaction, the potential energy of the products is lower than that of the reactants. Energy is being put in to make the reaction occur, but then that energy is all being released into the surroundings thus a lower potential energy level for the products
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A volume of 125 mL of H2O is initially at room temperature (22.00 ∘C). A chilled steel rod at 2.00 ∘C is placed in the water. If
VMariaS [17]

Answer:

41.9 g

Explanation:

We can calculate the heat released by the water and the heat absorbed by the steel rod using the following expression.

Q = c × m × ΔT

where,

c: specific heat capacity

m: mass

ΔT: change in temperature

If we consider the density of water is 1.00 g/mol, the mass of water is 125 g.

According to the law of conservation of energy, the sum of the heat released by the water (Qw) and the heat absorbed by the steel (Qs) is zero.

Qw + Qs = 0

Qw = -Qs

cw × mw × ΔTw = -cs × ms × ΔTs

(4.18 J/g.°C) × 125 g × (21.30°C-22.00°C) = -(0.452J/g.°C) × ms × (21.30°C-2.00°C)

ms = 41.9 g

3 0
3 years ago
Covert 1.57 x 10^14 nm= ___m
LekaFEV [45]

Answer:

1.57 x 10⁷m

Explanation:

Given quantity is;

          1.57 x 10¹⁴nm

Now;

            1 nm  = 10⁻⁹

So, let us convert this given quantity;

         1 nm          =             10⁻⁹

  1.57 x 10¹⁴nm  will give 1.57 x 10¹⁴ x 10⁻⁹  = 1.57 x 10⁷m

 

7 0
3 years ago
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