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sleet_krkn [62]
3 years ago
14

What is true about energy in an ordinary chemical reaction? Energy is

Chemistry
2 answers:
Mila [183]3 years ago
5 0

Answer: third choice, not created or destroyed.

Explanation:

1) During a chemical reaction energy is not either created or destroyed. It is only transferred and the total amount of energy remains constant.

2) That is the first law of thermodynamics, which means that it is a universal true and is verified in any process either chemical or physical.

3) Of course we constantly experience that some form of energy that we observe "dissapears". Well it does not. It is just transformed into other form of energy.

4) In the case of the chemical reactions, whe usually observe that in the form of heat: for example when H₂ reacts with O₂ to form H₂O a considerable amount of heat evolves. That is because potential chemical energy in the bonds of the reactants (O₂ and H₂) is released, this is, some potential chemica energy is transformed into heat and part of the chemical potential energy is in the product bonds.

That is why you can write the expression:

ΔH rxn = ∑ΔH products - ∑ΔH reactants, or

∑ΔH products = ΔH rxn + ∑ ΔH reactants.

Which you must interpret as that the energy of the reactants ends up as energy on the products or heat released by the reaction.

RSB [31]3 years ago
3 0
Energy is not created or destroyed due to the law of Conservation of Energy. Hope this helps!
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Describe how to use a transfer pipet to deliver 10.00 mL of liquid by placing the steps in the correct order.
nexus9112 [7]

This question is incomplete, the complete question is;

Describe how to use a transfer pipet to deliver 10.00 mL of liquid by placing the following steps in the correct order;

- Replace the bulb with your index finger and wipe excess liquid off the outside of the pipette.

- Place the tip of the pipette against the side of the beaker and drain the liquid from the pipette until the bottom of the meniscus reaches the calibration mark.

- Transfer the pipette to the receiving vessel.

- Drain the pipette by gravity while holding the tip against the side of the receiving vessel.

- Use a rubber bulb to suck liquid up past the 10.00 ml calibration mark.

- Suck up a third volume of liquid past the 10.00 ml calibration mark.

- Discard the first two pipette volumes of the liquid to rinse the pipette.

Answer:

- Use a rubber bulb to suck liquid up past the 10.00 ml calibration mark.

- Discard the first two pipette volumes of the liquid to rinse the pipette.

- Suck up a third volume of liquid past the 10.00 ml calibration mark.

- Replace the bulb with your index finger and wipe excess liquid off the outside of the pipette.

- Place the tip of the pipette against the side of the beaker and drain the liquid from the pipette until the bottom of the meniscus reaches the calibration mark.

- Transfer the pipette to the receiving vessel.

- Drain the pipette by gravity while holding the tip against the side of the receiving vessel.  

Explanation:  

First of all, We use a suction device to suck up liquid into pipet. Then we will fill the pipet up to the 10 mL marks and will discard the initial two volumes of liquid and will take a final third volume. We will replace the bulb with index finger and will drain it by placing the tip of pipet at the wall of beaker and drain the liquid.

Arranged in the following steps correctly;

- Use a rubber bulb to suck liquid up past the 10.00 ml calibration mark.

- Discard the first two pipette volumes of the liquid to rinse the pipette.

- Suck up a third volume of liquid past the 10.00 ml calibration mark.

- Replace the bulb with your index finger and wipe excess liquid off the outside of the pipette.

- Place the tip of the pipette against the side of the beaker and drain the liquid from the pipette until the bottom of the meniscus reaches the calibration mark.

- Transfer the pipette to the receiving vessel.

- Drain the pipette by gravity while holding the tip against the side of the receiving vessel.

5 0
3 years ago
What is carbon sink and how it effects our environment?
Ronch [10]

Answer:

Explanation:

Carbon sink is basically anything that absorbs carbon from the atmosphere.   Particularly, the soil, trees, plants and the ocean absorb the most carbon, which helps with greenhouse emission.

5 0
2 years ago
How many moles of CoH12O6 are consumed<br> if 6 moles of O2 are consumed?
Rashid [163]

Answer:

2

Explanation:

There are 3 moles O2 in 1 mole CoH12O6 so 2 moles are consumed

7 0
3 years ago
How many grams of Ca metal are produced by the electrolysis of molten CaBr2 using a current of 30.0 amp for
Vanyuwa [196]

Answer: 123 g

Explanation: Q =It = nzF. For Ca^2+ z= 2, t = 5.5 x 3600 s and I = 30.0

And F= 96485 As/mol

Amount of moles is n = It /zF = 3.078 mol , multiply with atomic mass 40.08 g/mol

4 0
3 years ago
a chemistry teacher adds 50.0 ml of 1.50 m h2so4 solution to 200 ml of water. What is the concentration of the final solution?
nevsk [136]

Answer:0.300M

Explanation:1) Data:

a) Initial solution

M = 1.50M

V = 50.0 ml = 0.050 l

b) Solvent added = 200 ml = 0.200 l

2) Formula:

Molarity: M = moles of solute / volume of solution is liters

3) Solution:

a) initial solution:

Clearing moles from the molarity formula: moles = M × V

moles of H₂SO₄ = M × V = 1.5M × 0.050 l = 0.075 mol

b) final solution:

i) Volumen of solution = 0.050 l + 0.200l = 0.250l

ii) M = 0.075 mol / 0.250 l = 0.300M ← answeer

5 0
2 years ago
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