CHEMISTRY HIGH SCHOOL

Which is a characteristic of a nonelectrolyte?A. It does not dissociate or ionize in water.
B. It partially dissociates or ionizes in water.
C. It conducts electricity poorly.
D. It conducts electricity extremely well.

Answers

Answer 1
Answer:

Answer: Option (A) is the correct answer.

Explanation:

Non-electrolytes are the substances which do not dissociate into a solution or water to form ions.

Since, non-electrolytes do not dissociate into ions. Hence, they do conduct electricity.

Thus, we can conclude that it does not dissociate or ionize in water is a characteristic of a non-electrolyte.

Non-electrolytes are neither partially ionizable nor do they conduct electricity poorly. Therefore, out of the given options, only option (A) is the correct answer.
Answer 2
Answer:

It is A on edge test

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Are these answers correct?1. A gas occupies 30 L at 760 mm Hg. What is its volume at 350 mm Hg? P1*V1 = P2*V2 760 mm Hg *30 L = 350 mm Hg * V2V2 = 22800 mm Hg*L/350 mm HgV2 = about 65.14 L2. A gas occupies 500 mL at 1 atm. What is its pressure if the volume becomes 1500 mL?P1*V1 = P2*V21 atm*500 mL = P2*1500 mL500 atm*mL/1500 mL = P2P2 = 1/3 atm3. If a gas occupies 250 mL at 25°C, what will its volume be at 57°C? 25°C + 273 = 298°K; 57°C + 273 = 330°KV1/T1 = V2/T2250 mL/298°K = V2/330°K0.84 mL/k*330°K = V2V2 = about 276.85 mL4. What was the original temperature of a 2 L sample of gas if it initially had the volume 5 L at 27°C? 27°C + 273 = 298°KV1/T1 = V2/T25 L/298°K = 2 L/T22 L/(0.017 L/K)= T2T2 = 119.2°K = -153.8°C 5. At what pressure would 100 mL of a gas be found if it began at 500 mL at 2.5 atm?P1*V1 = P2*V2 2.5 atm*500 mL = P2*100 mL125 atm*mL/100 mL = P2P2 = 1.25 atm6. What is the volume of a gas at 275 mm Hg if it occupied 750 mL at 1000 mm Hg?P1*V1 = P2*V21000 mm Hg*750 mL = 275 mm Hg*V2750000 mm Hg*mL/275 mm Hg = V2V2 = about 2727. 27 mL7. A gas occupies 60 L at 250°K and 1 atm. What is its volume at 250°C and 1.5 atm?250°C + 273 = 523°KP1*V1/T1 = P2*V2/T21 atm*60 L/250°K = 1.5 atm*V2/523°K0.24 (atm*L/K)*523°K = 1.5 atm*V2125.52 (atm*L)/1.5 atm = V2V2 = 83.68 L8. What is the final temperature in Celsius of a gas occupying 3.25 L at 750 mm Hg if it occupied 2250 mL at 37°C and 600 mm Hg? 37°C + 273 = 310°K; 2250 mL = 2.25 LP1*V1/T1 = P2*V2/T2600 mm Hg*2.25 L/310°K = 750 mm Hg*3.25 L/T22437.35 mm Hg*L/ (4.35 mm Hg*L/K) = T2T2 = 559.69°KT2 = about 286.69°C

what is the molarity of a concentrated hbr solution if the solution is 27.7% hbr by mass and has a density of 1.24 g/ml

Answers

The final answer is 4.246 Molar. For a given volume of the solution, let's say 100mL, the following calculations can be made:

Given:
Molar Mass HBr = 80.904g/mol
Density solution = 1.24 g/mL
27.7%(wt/wt) HBr


Total mass of solution = volume(density) = 100mL (1.24 g/mL) = 124 g solution

Mass HBr in solution = 124g(0.277) = 34.348 g HBr

Moles HBr in solution = 34.348/80.904 = 0.4246 moles HBr

Molarity = moles solute/L solution = 0.4246 moles HBr/0.1 L solution
Molarity = 4.246 M

Which is a correct comparison between the modern quantum model and John Dalton’s model of the atom?A.The modern model is not as widely accepted by scientists as Dalton’s model.
B. The modern model states that atoms of all elements are identical, whereas Dalton’s model does not.
C. The modern model recognizes particles in the atom, whereas Dalton’s model does not.
D. The modern model does not explain emission spectra, whereas Dalton’s model does.

Answers

The modern model recognizes particles in the atom, whereas Dalton’s model does not. The correct option is C.

What is an atom?

An atom is a matter particle that truly represents a chemicalelement. An atom is made up of a central nucleus encircled by one or more electrons.

Each electron carries a negative charge. The nucleus is positively charged and encompasses one or more protons and neutrons, which are relatively heavy particles.

According to current theory, electrons are in orbits all over the nucleus, which is made up of protons and neutrons.

It also indicates that all orbits are not the same and that their structures differ. According to quantumtheory, waves are associated with the properties of matter.

Dalton'smodel does not recognize particles in the atom, whereas the modern model does.

Thus, the correct option is C.

For more details regarding an atom, visit:

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Depends on your definition of the modern model. The one created by Neils Bohr differs from the quantum mechanical model.

For the Quantum mechanical model, A is untrue. The QM model is far more accepted than Dalton's because it explained the workings of the atom far better than any before.
For the NB model however, that was not accepted as much because it only worked when working with Hydrogen.

B: No model states that each atom is identical.

C: Dalton's model did NOT recognize particles in the atom, but the NB and QM models do.

D: The reverse is true.

So the answer is C.

Which scientific tool is the most useful when trying to convert a known amount of grams of water to moles of water?a scale
a thermometer
a periodic table
a spectrophotometer

Answers

The correct answer is the third option. A periodic table is the scientific tool that is most useful when trying to convert a known amount of grams of water to moles of water. Converting the amount of a substance from grams into moles, the molar mass is needed where it is the mass of a substance per 1 mole of the substance. This value is written in the periodic table.

c. a periodic table

Explanation:

i took the quiz lol have a great day. Jesus loves ya'll!

Which of the following would not necessarily indicate a chemical reaction?change in temperature
chemical precipitation of a solid
production of a gas
change in volume

Answers

Answer: Option (d) is the correct answer.

Explanation:

A change that does not cause any difference in chemical composition of a substance are known as physical change.

For example, shape, size, mass, volume, density, etc of a substance are all physical changes.

And, a change that causes changes in chemical composition of a substance is known as chemical change.

For example, precipitation, reactivity, toxicity etc are chemical change.

Therefore, change in temperature, chemical precipitation of a solid, production of a gas are all indications of a chemical change.

Thus, we can conclude that change in volume  would not necessarily indicate a chemical reaction.

Final answer:

Of the options provided, a change in volume would not necessarily indicate a chemical reaction. It could also be a sign of a physical change, such as a change in state.

Explanation:

The question is asking which of the listed factors would not necessarily indicate that a chemical reaction has taken place. From the options provided, a change in volume is not necessarily indicative of a chemical reaction. Other signs (like change in temperature, chemical precipitation of a solid, or production of a gas) are often valid signs of a chemical reaction, however, just a volume change could also be a sign of a physical change, such as a change in state from solid to liquid, or liquid to gas.

For example, when ice melts to water, or water evaporates to steam, it experiences a change in volume. This does not involve the forming or breaking of chemical bonds, thus it's not a chemical reaction, but a physical change.

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What happens when an electron moves to a higher energy level?The atom loses the electron.

The atom becomes more stable.

The electron gains energy.

Answers

Answer: Option (c) is the correct answer.

Explanation:

When energy is supplied to an electron then on absorption of energy it tends to move from a lower energy level to higher energy level.

And, when this electron moves from higher energy level to lower energy level then excess of energy absorbed by it is released in the form of visible light or radiation.

This emission of energy is also responsible for imparting color to a compound.

Thus, we can conclude that electron gains energy when an electron moves to a higher energy level.

Answer:

The electrons in an atom exist in various energy levels. When an electron moves from a lower energy level to a higher energy level, energy is absorbed by the atom. When an electron moves from a higher to a lower energy level, energy is released (often as light).

Explanation:

The electrons in an atom exist in various energy levels. When an electron moves from a lower energy level to a higher energy level, energy is absorbed by the atom. When an electron moves from a higher to a lower energy level, energy is released (often as light).

While testing amylase activity, John uses a buffer of pH 6 and substrate starch. He incubates them at 104ºF (40ºC). All the tubes show glucose formation, except one, which had no starch solution. Why did this happen?A) the optimum pH for enzyme amylase is not pH 6
B) the optimum temputure for the enzyme amylase is not 104. F (40.)
C) the substrate for amylase, starch, is not present

Answers

While testing amylase activity, John uses a buffer of pH 6 and substrate starch. He incubates them at 104ºF (40ºC). All the tubes show glucose formation, except one, which had no starch solution because  the substrate for amylase, starch, is not present so thats why it does not show glucose formation
so correct option is C
hope it helps

Answer:

c

Explanation:
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