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2 years ago

Which unit can be used to express the rate of a reaction?

2 answers:

4 0

The rate of reaction may be expressed as a unit of quantity divided by a unit of time. The only expression that has a quantity divided by time is the first one mL / s (i.e. milliliter per second), so the answer is the first option, mL/s.

almond37 [142]2 years ago

4 0

Answer: mL / s

Explanation:

1) The rate of reaction is a speed. It is defined as the change in amount per time unit.

2) In form of equation reaction rate = Δ amount / time

3) Usually, it is more interesting to express the reaction rate in terms of the change of concentration, which is

reaction rate = Δ concentration / time

In those cases, the concentration is expressed in molar units per liter, so the rate is expressed as:

M / s = [mole/liter] / s

Which is what we usually find, but it is not mandatory.

4) So, other units can be used, like moles or volume (even pressure) to express the amount of a spices.

5) That is why rate of reation can be expressed as mL / s (mililiters per second).

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Students in class argue about whether salt (NaCl) or water (H2O) has stronger intramolecular forces. Which argument is BEST?

Yanka [14]

Since intermolecular forces is stronger in a solid than a liquid, then NaCl has stronger intermolecular forces than H2O.

Intermolecular forces exists between molecules of the same or different kinds. Water has a dipole moment hence it can interact effectively with the ions in NaCl. This leads to an ion dipole interaction that results in the dissolution of NaCl in H2O.

NaCl is a solid and water is a liquid. Since intermolecular forces is stronger in a solid than a liquid, then NaCl has stronger intermolecular forces than H2O.

Hence, the best argument that compares the intermolecular interactions in water and NaCl is; salt is a solid and water is a liquid, so water has stronger intramolecular forces.

Learn more: brainly.com/question/12108425

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2 years ago

Identify two natural hazards that are more likely to occur in Maryland

tamaranim1 [39]

Answer:

snow storm and a blizzard

Explanation:

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2 years ago

7. Lawrencium has a half-life of 3.00 minutes. I started with a 100.0 g sample. After 45.0 minutes how

Zinaida [17]

Answer:

N=3.05*10^-3g

Explanation:

Using Ln(No/N)=0.693/t½*t

Ln(No/N)=0.693/3*45

No/N=exp(10.396)

100/exp(10.396)=N

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3 years ago

Which way will the equilibrium shift if you..... cool it to a low temperature?

igor_vitrenko [27]

If you can provide the reaction you are looking at, then we can provide a more satisfactory answer.

If the forward reaction is exothermic, then reducing the temperature where the reaction occurs will shift the equilibrium towards the right. This is because exothermic reactions release heat, and this will counteract the change as stated in Le Chatelier's Principle.

If the forward reaction is endothermic, then reducing the temperature will shift to the left. This occurs as the backward reaction is the exothermic reaction, and by Le Chatelier's Principle, the reaction will favor the reaction that produces more in to counter a reduction in temperature, in this case the backward direction reaction.

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3 years ago

Complete orbital diagrams (boxes with arrows in them) to represent the electron configuration of valence electrons of carbon bef

kramer

Answer:

Explanation:

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After Hybridization => C: 1s² 2sp¹ 2sp¹ 2p₀¹2p₊₁¹ => 2 hybrid orbitals and 2 unhybridized p-orbitals at the n=2 energy level.

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3 years ago