What is the definition of a Lewis acid?a substance that accepts electrons to form a covalent bond
a substance that donates electrons to form a covalent bond
a substance that accepts a proton
a substance that donates a proton

Answers

Answer 1

Answer:

Lewis acid is:

A. a substance that accepts electrons to form a covalent bond

What is a Lewis acid?

A Lewis acid is accordingly any substance, for example, the H+ particle, that can acknowledge a couple of nonbonding electrons. At the end of the day, a Lewis acid is an electron-pair acceptor.

Thus, option A is correct.

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Answer 2

Answer:

Answer:

A: a substance that accepts electrons to form a covalent bond.

Explanation:

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As the activation energy of a reaction decreases, the number of molecules with at least this much energy ______________.

How many moles of sodium hydroxide are contained in 65.0 mL of a 2.20 M solution?

Answers

2.20 M means there are 2,20 mol of NaOH in 1 000 mL of solution. We can use this proportion as a conversion factor:

$65\ mL\cdot (2.20\ mol)/(1\ 000\ mL) = \bf 0.143\ mol$

Which changes occur as a cadmium atom, Cd, becomes a cadmium ion, Cd2+?(1) The Cd atom gains two electrons and its radius decreases.
(2) The Cd atom gains two electrons and its radius increases.
(3) The Cd atom loses two electrons and its radius decreases.
(4) The Cd atom loses two electrons and its radius increases.

Answers

The answer is (3). To form the cation (positive ion), Cd must lose negative charge, so two electrons are lost. This loss in electrons also increases the effective nuclear charge/ reduces electron shielding. In other words, with two less electrons to hold, the nucleus exerts a stronger attractive force on the remaining electrons, so the electron cloud is pulled closer to the nucleus. The radius therefore decreases.

What is the empirical formula for a compoundwith the molecular formula C6H12Cl2O2?
(1) CHClO (3) C3H6ClO
(2) CH2ClO (4) C6H12Cl2O2

Answers

3. C₃H₆ClO

Molecular formulas tell you how many atoms of each element are in a compound, while

Empirical formulas tell you the simplest or most reduced ratio of elements in a compound.

Given: Molecular formula=C₆H₁₂Cl₂O₂

So, the simplest or most reduced ratio for this formula is C₃H₆ClO which can be deduced by dividing the molecular formula by 2 in order to get its empirical formula.

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Answer: $C_3H_6ClO$

Explanation:

Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.

Empirical formula is the simplest chemical formula which depicts the whole number of atoms of each element present in the compound.

Thus the compound with molecular formula $C_6H_(12)Cl_2O_2$ will have simplest ratio of atoms as 3:6:1:1 and thus empirical formula will be $C_3H_6ClO$ .

Magnesium and iron are metallic elements. How does a mole of magnesium compare with a mole of iron?a) A mole of iron has more atoms.
b) They both have the same mass.
c) A mole of magnesium has more mass.
d) They both have the same number of atoms.

Answers

Given a mole each for iron and magnesium, the number of atoms of each element is equal. Iron has a greater mass due to its greater molecular weight. The correct statement among the choices is D.

Answer: d) They both have the same number of atoms.

Explanation:

A mole is defined as the amount of substance that contains Avogardro number of the substance. Avogadro's number is given by $6.022* 10^(23)$ .

$1mole=6.022* 10^(23)particles$

According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number $6.023* 10^(23)$

Thus 1 mole of magnesium and iron both contains $6.023* 10^(23)$ particles.

The gray balls represent _____ and have a neutral charge. protons neutrons electrons

Answers

Protons have a positive charge.Electrons have a negative charge.Neutrons have no (neutral) charge.

Answer: The correct answer is neutrons.

Explanation:

There are 3 subatomic particles that are present in an atom. They are: protons, electrons and neutrons.

Protons carry positive charge and are found inside the nucleus of an atom.

Electrons carry negative charge and are found around the nucleus in the orbits.

Neutrons does not carry any charge and are found inside the nucleus of an atom.

Hence, the correct answer is neutrons.

Describe the theory of plate tectonics

Answers

Answer:

The theory of plate tectonics states that the Earth's solid outer crust, the lithosphere, is separated into plates that move over the asthenosphere, the molten upper portion of the mantle. Oceanic and continental plates come together, spread apart, and interact at boundaries all over the planet.

Explanation:

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