CHEMISTRY HIGH SCHOOL

Mrs. Rushing fills a balloon with hydrogen gas to demonstrate its ability to burn. Which combination could sheuse to produce the hydrogen she needs?

NaOH and oil

Zn and KOH

H2SO, and CaCO

0 Mg and HCI

I’ll mark your reply if the answer was correct.

Answers

Answer 1
Answer:

Answer:

Its D

Explanation:

I took the Unit Test on Edge
Answer 2
Answer:

Answer:

D. Mg and HCl

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If one ball with a momentum of 50 kg·m/s hits a ball at rest and no other forces are acting on either ball, what's the total momentum of both balls after the collision? A. 0 kg·m/s B. 25 kg·m/s C. 100 kg·m/s D. 50 kg·m/s
What are transferred in an oxidation-reduction reaction
The addition of a catalyst in a chemical reaction (A) increases the concentration of products at equilibrium. (B) increases the fraction of reactant molecules with a given kinetic energy. (C) provides an alternate path with a different activation energy. (D) lowers the enthalpy change in the overall reaction
A bike tire contains a fixed amount of gas at a constant pressure. Initially, the tire contains 4.00 iters of air at 26 degrees Celsius. When the temperature drops to 22 degrees Celsius, the volume of the bike tire will decrease to 3.95 liters.TRUEFALSE
In real life, a given system can approach equilibrium from different starting points but will still have the same equilibrium constant. How is this possible? Explain your answer in complete sentences.

Which substance is an electrolyte?
(1) CH3OH (3) H2O
(2) C6H12O6 (4) KOH

Answers

Answer:

The answer is 4) KOH

Explanation:

Electrolytes are substances which ionize when dissolved in water. They are classified as:

Strong electrolyte: Which completely ionize when in water. Eg: NAOH, KOH (produces K+ and OH- ions when dissolved in water)

Weak electrolyte: partially ionize when in water. Eg: Acetic acid

Non-electrolyte: Do not ionize at all in water. Eg: Alcohols such CH3OH, sugars such as glucose (C6H12O6).

KOH is an electrolyte. Therefore, option (4) is correct.

Electricity flows via water-dissolved materials. Ions in a solution conduct electricity.The options:When dissolved in water, methanol (CH3OH) does not form ions.2. C6H12O6 (Glucose): It does not dissolve into ions in water, hence it is not an electrolyte.

Water doesn't dissolve into ions, hence it's not an electrolyte.4. Dissolved in water, potassium hydroxide (KOH) forms ions (K+ and OH-), making it an electrolyte. Therefore, KOH as an electrolyte is the correct option.

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The concept of an ideal gas is used to explain(1) the mass of a gas sample(2) the behavior of a gas sample(3) why some gases are monatomic(4) why some gases are diatomic

Answers

Ideal gas is used to explain the behavior of a gas sample. In ideal gas law, the equation is PV=nRT where R has a constant of 0.0821L.atm/mol.K. It can explain the behaviior of a gas in three types: mole, mass and density. The ideal gas often observed in a high temperature with low pressure as to potential energy becomes less significant compared to the kinetic energy.

Final answer:

The concept of an ideal gas is chiefly used to explain the behavior of a gas sample according to the ideal gas law. It's not primarily used to determine the mass of a gas sample, or whether a gas is monatomic or diatomic.

Explanation:

The concept of an ideal gas is primarily used to explain the behavior of a gas sample. An ideal gas is a theoretical gas composed of randomly moving, non-interacting point particles. It follows the ideal gas law which is PV=nRT, where P is the pressure, V is the volume, n is the number of moles, R is the universal gas constant, and T is the absolute temperature. The ideal gas law allows us to predict how a gas will behave under different conditions of pressure, volume, and temperature.

The mass of a gas sample is inherently tied to the moles of gas, per the molar mass concept in the ideal gas law. As for whether a gas is monatomic or diatomic, this depends on the atomic structure and bonding of the specific gas species, and not the ideal gas concept itself.

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The glow emitted by a substance exposed to eternal radiation is called

Answers

The glow emitted by a substance exposed to external radiation is called 'fluorescence'. In fluorescence, a fluorophore is exposed to external radiation, absorbs the energy and emits a form of light or glow. The answer to this question is 'fluorescence'. I hope this helps.

A company is designing a new range of saucepans. The base of the saucepan should conduct heat well and evenly while the handle should be a good insulator. Which one of
the following lists of substances would be the most appropriate for these tasks?

Base Handle
(a) aluminium aluminium
(b) copper plastic
(c) glass glass
(d) plastic copper

Answers

d)plastic copper
......................
A copper base connected to a plastic handle is a good functional combination.

If they're listed in the choices in the same order that they're mentioned in the
description, then choice-'b' is it.

Air tends to move from _____.a. the equator to the poles
b. conduction
c. cold air rising and warm air sinking
d. radiation

Answers

Answer:

cold air rising and warm air sinking

Explanation:

Convection is well known in nature. During convection, warm particles rise above the surface while cooler particles sink below. Hence a convection current is set up.

Air moves by convection. Hot air rises and moves toward and is then replaced with cooler air. A typical application of convection in nature is land and sea breeze.
i would say a. at the equator to the poles or maybe c. cold air rising and warm air sinking.

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