All categories

3 years ago

Which phrase describes valence electrons? (1 point)

Chemistry

2 answers:

dimaraw [331]3 years ago

7 0

Answer:

the electrons in an atom's outermost energy level

Explanation:

Anna11 [10]3 years ago

4 0

Answer:

Explanation:

the electrons in an atom's outermost energy level

You might be interested in

Select the correct answer. Why does every chemical reaction require a certain amount of activation energy? A. Energy is released

horsena [70]

Answer:

The answer is: B. Energy lost to the environment during the reaction must be replaced.

Explanation:

5 0

3 years ago

How does activation energy affect a chemical reaction ?

PilotLPTM [1.2K]

Enzymes affect the rate of the reaction in both the forward and reverse directions; the reaction proceeds faster because less energy is required for molecules to react when they collide. Thus, the rate constant (k) increases. Figure 3: Lowering the Activation Energy of a Reaction by a Catalyst.

hope this helps!

3 0

3 years ago

Read 2 more answers

Conservation of mass was discussed in the background. Describe how conservation of mass (actual, not theoretical) could be check

Sedbober [7]

Answer:

Conservation of mass can be checked in an experiment . There are three steps to do it in a best way:

1. Weigh all the equipment and materials required in the experiment before the experiment.

2. Avoid spillage and evaporation during the experiment.

3. Weigh all the equipment and materials after the experiment.

If the mass is conserved then weight from step 1 is equal to weight from step

3 0

3 years ago

What is the purpose of the plasma membrane

Murljashka [212]

The plasma membrane is the boundary between the cell and its environment. It regulates what enters and exits the cell. Cells must maintain an appropriate amount of molecules to function inside them. They must also have a way to keep things out or to allow things to enter.

4 0

4 years ago

Read 2 more answers

At a temperature of 273 K, a 400.-milliliter gas sample has a pressure of 760. millimeters of mercury. If the pressure is change

KatRina [158]

Answer:

188.03K

Explanation:

The following data were obtained from the question:

T1 (initial temperature) =273K

V1 (initial volume) = 400mL

P1 (initial pressure) = 760mmHg

P2 (final pressure) = 380mmHg

V2 (final volume) = 551mL

T2 (final temperature) =?

Applying the general gas equation P1V1/T1 = P2V2/T2, the final temperature of the gas can be obtained as follow:

P1V1/T1 = P2V2/T2

760 x 400/273 = 380 x 551/T2

Cross multiply to express in linear form as shown below:

760 x 400 x T2 = 273 x 380 x 551

Divide both side by 760 x 400

T2 = (273 x 380 x 551)/(760 x 400)

T2 = 188.03K.

Therefore, at a temperature of 188.03K, the gas sample will have a volume of 551mL

3 0

4 years ago