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3 years ago

The angle between the horizon and the sun is a.large b.smallat both sunrise and sunset

Chemistry

2 answers:

Inessa [10]3 years ago

6 0

Answer: b

Explanation:

Sveta_85 [38]3 years ago

5 0

The answer is b: small at both sunrise and sunset

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Is a tree getting struck by lightning a physical or chemical change?

FrozenT [24]

A tree getting struck by lightning, it is an example of a physical change.

It is so because when a tree getting struck by lightning, it encountered a strong force of power but no new substance is formed here. So it is a physical change, if it is a chemical change then a new substance must formed here. So when a tree getting struck by lightning, it is an example of a physical change.

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3 years ago

(a) Write the dissolution reaction for solid Na2CO3 below. (Use the lowest possible coefficients. Include states-of-matter under

Andreas93 [3]

Answer:

For a: The chemical equation for the dissolution of sodium carbonate is $Na_2CO_3(s)\rightarrow Na_2CO_3(aq.)$

For b: The net acid-base reaction is $CO_3^{2-}(aq.)+H_2O(l)\rightarrow OH^-(aq.)+HCO_3^-(aq.)$

Explanation:

For a:

Dissolution reaction is defined as the reaction in which a solid compound gets dissolved in water to form aqueous solution.

The chemical equation for the dissolution of sodium carbonate follows:

$Na_2CO_3(s)\rightarrow Na_2CO_3(aq.)$

Ionization reaction is defined as the reaction in which an ionic compound dissociates into its ions when dissolved in aqueous solution.

The chemical equation for the ionization of sodium carbonate follows:

$Na_2CO_3(aq.)\rightarrow 2Na^+(aq.)+CO_3^{3-}(aq.)$

For b:

Now, the anion formed which is $CO_3^{2-}$ reacts with water to form conjugate acid.

The chemical equation for the reaction of anion with water follows:

$CO_3^{2-}(aq.)+H_2O(l)\rightarrow OH^-(aq.)+HCO_3^-(aq.)$

Hence, the net acid-base reaction of the anion formed and water is written above.

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3 years ago

As atoms get smaller,valance electrons are getting closer or farther away from the nucleous.The force of attraction is stronger

LiRa [457]

Explanation:

Electrons are closer to the nucleus are in filled orbitals and are called core electrons. More energy which in nucleus called nuclear strOng energy to remove electron thars why its also a way harder too..

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3 years ago

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vodomira [7]

Answer:

"please please help me" LOL

Explanation:

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3 years ago

What is the molecular geometry of a molecule made of two atoms that share one pair of electrons and have no lone electrons pairs

morpeh [17]

Answer:

linear

Explanation:

Actually I consulted various sources too and that was the most sought answer,I just decided to answer you before studying it too

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3 years ago

The angle between the horizon and the sun is a.large b.smallat both sunrise and sunset​

The angle between the horizon and the sun is a.large b.smallat both sunrise and sunset