CHEMISTRY HIGH SCHOOL

A substance that can donate a pair of electrons to form a covalent bond is known as a(n) _____ base.

Answers

Answer 1
Answer:

Answer : A substance that can donate a pair of electrons to form a covalent bond is known as a(n) Lewis-base.

Explanation :

According to the Lewis acid-base theory,

Lewis acid : It is a substance that can accepts pairs of electrons to form a covalent bond.

Lewis-base : It is a substance that can donates pairs of electrons to form a covalent bond.

For example :

H^++OH^-\rightarrow H_2O

In this reaction, H^+ ion is Lewis-acid and OH^- ion is a Lewis-base. The OH^- ion donates electrons to H^+ ion to form H_2O.

Hence, a substance that can donate a pair of electrons to form a covalent bond is known as a(n) Lewis-base.
Answer 2
Answer:

A substance that can donate a pair of electrons to form a covalent bond is known as a Lewis base. It is any substance that can donate a pair of nonbonding electrons. The Lewis theory suggests that acids react with bases to share a pair of electrons with no change of oxidation numbers of any atoms.

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When electrons absorb energy they are able toa. move from exited states down to their ground states.
b. move from their ground states up to excited states.
c. attach to the nucleus.
d. form a bond with the nearest proton.

Answers

When electrons absorb energy they are able to move from their ground states up to excited states. The answer is letter B. an example of this is when you light a match. The molecules of the matchstick are in its ground state. When you flick it on the ground or anything hard, it causes its molecules to move into the excited state and thus causing fire.

What is the correct name for SiCl5?

Answers

Answer:

SbCl5

Antimony pentachloride

Antimony pentachloride is a chemical compound with the formula SbCl5.

- wikipedia

All parts of the rock cycle are connected, whether directly or indirectly. Which statementbest shows how sedimentary rocks are related to igneous rocks?
1.Under pressure, sedimentary rocks form from igneous rock.
2.Igneous rocks can weather, creating sediments that form sedimentary rocks.
3. During weathering, sedimentary rocks melt and form igneous rock.
4.Under pressure, igneous rock undergoes changes that form sedimentary rock.

Answers

Answer:

2. Igneous rocks can weather, creating sediments that form sedimentary rocks

Explanation:

Sedimentary rocks are formed from Igneous rocks when rocks are broken down by weathering.

Based on its location on the periodic table, which metal is likely to be less reactive than rubidium and more reactive than calcium?potassium (K)

cesium (Cs)

magnesium (Mg)

titanium (Ti)

Answers

Answer: Potassium is the element which is less reactive than rubidium and more reactive than Calcium.

Explanation: Reactivity of an metal is defined as the tendency to loose electrons easily. In a periodic table, the reactivity increases down the group as size of the metal increases. The reactivity decreases across a period as the size of the metal decreases.

Rubidium lies in group 1, which has elements in the series: H, Li, Na, K, Rb, Cs and Fr.

And Calcium lies in period 4 which has elements in the series: K, Ca, (1st transition series), Ga, Ge, As, Se, Br and Kr.

So, the element to have reactivity more than rubidium and less than Calcium must be Potassium (K).

Answer:

A is the correct answer on edge

Explanation:

A)potassium (K)

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Answer:

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Answers

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