What is the term used to describe the energy needed to get a reaction started?a. adhesion energy
c. cohesion energy
b. activation energy
d. chemical energy

Answers

Answer 1

Answer: When a reaction starts, activation energy is needed.

Answer: b. activation energy

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According to the kinetic molecular theory, whichstatement describes the particles in a sample of an ideal gas? A. The particles are constantly moving in circular paths. B. The particles collide, decreasing the total energy of the system. C. The particles have attractive forces between them D. The particles are considered to have negligible volume.

“Gasoline boils at a relatively low temperature (about 150°C). The kerosene is removed at around 200°C, followed by diesel oil at 300°C and fuel oil at around 370°C.”

Answers

The correct answer is letter a. distillation of a mixture. “Gasoline boils at a relatively low temperature (about 150°C). The kerosene is removed at around 200°C, followed by diesel oil at 300°C and fuel oil ataround 370°C," It is the process of DISTILLATION OF A MIXTURE.Here is the question.

What topic is the teacher most likely talking about?
a. distillation of a mixture
b. filtration of a pure substance
c.evaporation of a mixture
d. sorting of a pure substance

Answer: distillation

Explanation:

A strong acid with a concentration of 0.01 Mol/L would have a pH of __________.2

1

3

4

Answers

Answer:

Explanation:

the pH of the strong acid solution will be

pH = -log[H+] = -log[0.01] = 2

Predict whether a reaction will occur when HClO and Sr(OH)2 solutions are mixed, if yes determine spectator ions in the ionic equation.

Answers

Answer:

$ClO^-\n\nSr^(2+)$

Explanation:

Hello there!

In this case, according to the reaction between hypochlorous acid and strontium hydroxide which yields stontium hypochlorite and water as a neutralization reaction:

$2HClO(aq)+Sr(OH)_2(aq)\rightarrow Sr(ClO)_2(aq)+2H_2O(l)$

Thus, since HClO is a weak acid, it is not fully ionized so the complete ionic equation turns out to be:

$2H^++2ClO^-+Sr^(2+)+2(OH)^-\rightarrow Sr^(2+)+2(ClO)^-+2H_2O(l)$

Whereas the spectator ions, which remain the same at both sides of the equation, are:

$ClO^-\n\nSr^(2+)$

Best regards!

Final answer:

A reaction occurs when HClO and Sr(OH)2 are mixed forming Sr(ClO)2 and H2O. In this reaction there are no spectator ions as all ions participate in the reaction forming new compounds.

Explanation:

When HClO (hypochlorous acid) and Sr(OH)2 (strontium hydroxide) solutions are mixed, a reaction takes place, resulting in the formation of Sr(ClO)2 and H2O. In this reaction, Sr2+ and OH- from Sr(OH)2 and H+ and ClO- from HClO are the ions that participate, therefore there are no spectator ions in the reaction. In the net ionic equation, spectator ions are the ions that remain the same in their ionic form on the both sides of the equation (reactant side and product side), thus, in this case, there are none. It's important to understand the concept of

solubility guidelines

and their use in determining reaction outcomes and recognizing

spectator ions

Learn more about Chemistry of Reaction here:

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A mixture of sand and table salt can be separated by filtration because the substances in the mixture differ in( I) boiling point (2) density at STP(3) freezing point (4) solubility in water

Answers

A mixture of sand and table salt can be separated by filtration because the substances in the mixture differ in solubility in water. Thus, the correct option for this question is D.

What is meant by Solubility?

Solubility may be defined as the phenomenon in chemistry that involves the maximum amount of a substance that will significantly be disbanded in a given amount of solvent at a particular temperature.

The answer to the above question is better understood by the fact that when you mix both salt and sand in the water, you may find that salt is completely soluble in water while sand is not. This is because the bond of water is not competent enough to dissolve the sand.

Therefore, the correct option for this question is D.

To learn more about Solubility, refer to the link:

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The answer is (4) solubility in water. When you put the mixture into water, the salt will dissolve and sand will not. The you can separated them by filtration will solution can pass through and sand will be left.

Use the ideal gas law to calculate the pressure in atmospheres of 0.21 mol of helium (He) at 16°C & occupying 2.53 L. You must show all of your work to earn credit. **Don't forget to convert your Celsius temperature to Kelvin***picture attached !!*

Answers

Answer:

The answer to your question is 2.32 atm

Explanation:

Data

P = ?

n = 0.214

V = 2.53 L

T = 61°C

R = 0.082 atm L/mol°K

Formula

PV = nTR

solve for P

P = nRT/V

Process

1.- Calculate the temperature in K

°K = °C + 273

°K = 61 + 273

= 334

2.- Substitution

P = (0.214 x 0.082 x 334) / 2.53

3.- Simplification

P = 5.86/2.53

4.- Result

P = 2.32 atm

How is the periodic table constructed ?

Answers

Before the periodic table, there were a bunch of symbols, number, letters etc (In all kinds of languages) that represented the elements. Scientists around the world saw that a chart of the elements needed to be universally accepted and finalized. A guy named Mendeleev presented this idea to the scientific community. Mendeleev was also the first to order elements according to atomic number rather than atomic weight. The modern day periodic table was not published by him, it was developed with the help of the entire scientific community. Honestly, there isn't a specific way to tell you how the periodic table was constructed, scientists developed thousands of tables that represented the elements. And just to let you know, the modern day periodic table is constantly going through changes as we discover more and more about elements, atoms, molecules etc. so in the near future it wouldn't be surprising if we saw something completely different than what we see today.

The Periodic Table is in order of electrons, and the columns are set up to show the amount of electrons in the outer most orbit.

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