Which of the following sets represents a pair of isotopes? 14C and 14N 206Pb and 208Pb O2 and O3 32S and 32S2-

Answers

Answer 1

Answer: Isotopes are substances that have the same number of protons but differ in the number of neutrons. Hence, the pair of isotopes above should be of the same element. In the given choices, 14C is not an isotope of 14N. 206Pb is an isotope of 208 Pb. O2 and O3 differ in molecular formula but still made up of same kind of atom, hence they are allotropes, while 32S and 32S2- are not isotopes.

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Which of the following is a physical property of a substance?? A. Combustion B. Corrosion C. Tendency to tarnish D. Solubility

Answers

A physical property does not change the substance.

Solubility would be the answer since all of the rest are changing the substance. They all deal with bonds except solubility.

Answer: D. Solubility

A physical property is any property that doesnot concern with the change of the substance. The changes in the physicalproperty can be used to describe its transformations or evolutions from itsinitial state. They are often referred to as observables. Solubility is an example of a physical property.The solubility of substance describesa state of a dissolving a powdered form in a liquid. Combustion, Corrosion andtendency to tarnish are examples of a chemical change. They are substances thatchanges its physical state and composition resulting from a chemical reaction

Describe the role of energy in chemical reactions.

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Energy in a chemical reaction is not created nor destroyed, it's always conserved based on the law of conservation of energy.

According to one acid-base theory, a water molecule acts as an acid when the water molecule(1) accepts an H+ (3) donates an H+
(2) accepts an OH– (4) donates an OH–

Answers

A water molecule acts as an acid when the water molecule donates an H+.

The correct option is 3, donates an H+.

What is the acid-base theory?

The Acid-base theory tells that if a substance produce hydrogen ion is called as an acid.

If the substance accepts, a hydrogen ion is called as base.

This theory is given by Arrhenius.

Thus, the correct option is 3, donates an H+.

Learn more about acids, here:

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According to one acid-base theory, a water molecule acts as an acid when the water molecule (3) donates an H+.

The data listed below are for mechanical waves. Which wave has the greatest energy? amplitude = 7 cm; wavelength = 12 cm; period = 14 seconds amplitude =12 cm; wavelength = 14 cm; period = 7 seconds amplitude = 14 cm; wavelength = 7 cm; period = 12 seconds

Answers

Explanation :

The amplitude, wavelength and time period of three waves are given.

We know that energy of a wave is given by :

$E=(h\ c)/(\lambda)$

It is clear that energy of a wave is inversely proportional to the wavelength i.e $E\propto (1)/(\lambda)$

So, the wave having less wavelength will have the greatest energy.

Also, we know that energy of a wave is directly proportional to the square of amplitude i.e. $E\propto(Amplitude)^2$

So, again the wave having maximum amplitude will have maximum energy.

Hence, the correct option is (C) i.e. "amplitude = 14 cm; wavelength = 7 cm; period = 12 seconds".

The equation for the energy of a wave is given by the equation of E = A^2 where E is the energy of the wave and A is the amplitude. The higher the amplitude, the greater the energy of the wave is and vice versa. An amplitude of 14cm has the greatest energy of the wave followed by 12cm and then 7cm.

The process of breaking down of a chemical compound into its elements by chemical means is called: a) Analysis b) Synthesis c) Cracking d) None of the above

Answers

Answer:analysis

Explanation:

The combined gas law sets up a relationship between which of the following?A. pressure and temperature only
B. volume and temperature only
C. volume and pressure only
D. pressure, volume, and temperature

Answers

Answer:

The correct option is D

Explanation:

The combined gas law is a combination of the three gas laws; Boyle's law, Charles' law and Gay-Lussac's law. It describes the relationship of the product of the pressure, volume and temperature of a gas to a constant as shown in the formula below

P₁V₁/T₁ = P₂V₂/T₂

Where P₁ is the initial pressure

V₁ is the initial volume

T₁ is the initial temperature (in Kelvin)

P₂ is the final pressure

V₂ is the final volume

T₂ is the final temperature (in Kelvin)

The combined gas law combines the three gas laws: Boyle's Law, Charles'Law, and Gay-Lussac's Law. It states that the ratio of the product of pressure and volume and the absolute temperature of a gas is equal to a constant. When Avogadro's law is added to the combined gas law, the ideal gas law res

Answer is volume and pressure only

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