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3 years ago

SCIENCE HELP! 10 POINTS

Chemistry

1 answer:

Zepler [3.9K]3 years ago

6 0

We are not 8n your. lass we need mor detail??

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How do you know how many valence electrons are in a molecule?

telo118 [61]

1. by making a atomic configuration
2.by making a table of shells of k.l.m.n....
that's all

4 0

4 years ago

Read 2 more answers

What type of energy for a spring is compressed

Firlakuza [10]

Answer:

potential energy is answer

Explanation:

7 0

3 years ago

When baking soda (NaHCO3) dissolves in water, it separates into a cation (positive ion) and an anion (negative ion). Give the ch

goldenfox [79]

Answer:

Na⁺ and HCO⁻₃

Explanation:

When baking soda is dissolve in water it fully ionized into positive and negative ions.

NaHCO₃ + H₂O → Na⁺ + HCO⁻₃

The Na⁺ than react with OH⁻ of water and produced NaOH while HCO⁻₃ react with H⁺ and produce H₂CO₃. This carbonic acid than break to produced carbon dioxide and water.

H₂CO₃ → H₂O + CO₂

Properties of baking soda:

It is odorless compound.

It is solid at room temperature.

It is used in medicine to cure the acidity of stomach.

It is used to make baking powder.

8 0

4 years ago

The distance from the Moon to Earth is 5.46 * 108 km. How long does it take a laser need to travel between the moon and earth?

Gennadij [26K]

Answer:

B. 1.82(10³) seconds (1820 seconds)

Explanation:

Speed of Light: 3.00(10⁸) m/s or 3.00(10⁵) km/s

We know the distance from the Moon to Earth as 5.46(10⁸) km

We simply divide the distance by the speed of light:

$\frac{5.46(10^8)}{3.00(10^5)}$

We should get 1820 seconds or B. 1.82(10³) as our answer.

8 0

4 years ago

Graph of the relationship between mass and thermal energy

elixir [45]

Thermal energy is the sum of the kinetic and potential energies of all the particles in an object.

Assume that you have 250 gL of water and 1 kg of water at the same temperature.

Then, each water molecule has the same kinetic energy.

The larger sample contains four times as many molecules, so it contains four times as much thermal energy.

Thus, thermal energy is directly proportional to mass.

In symbols, KE ∝ m or KE = km.

The graph of a direct proportion is a straight line passing trough the origin.

It should look something like the graph below.

6 0

4 years ago