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3 years ago

What causes the seasonal changes viewed in the night sky?

Chemistry

2 answers:

jonny [76]3 years ago

8 0

Answer:

If you look at the night sky different

times of the year you see different

constellation.This change due to the

motion of the earth in it's orbit around

the sun.The shift of the sky is really

the motion of the earth around the sun.

Explanation:

Hope it helps

Ksenya-84 [330]3 years ago

8 0

Explanation:

the factors which bring about the chemical reaction

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Protons,neutrons,and electrons

ddd [48]

Protons, Electrons, and Neutrons are all parts of atoms, the electrons are on the outside rings of the atom, with the neutrons and electrons on the inside of the atom. The electrons are negatively charged, while the protons are positively charged and the neutrons no charge/neutral. Let me know if you would like to learn more!

4 0

3 years ago

How many protons, electrons, and neutrons does an atom with atomic number 50 and a mass number of 125 contain?

EleoNora [17]

Answer:

a) 50 protons, 50 electrons, 75 neutrons

Explanation:

How many protons, electrons, and neutrons does an atom with atomic number 50 and a mass number of 125 contain?

a) 50 protons, 50 electrons, 75 trons

b) 75 electrons, 50 protons, 50 neutrons

c) 120 neutrons, 50 protons, 75 electrons

atomic number IS the number of protons

atomic mass IS the total of protons + neutrons

so 50 protons

125-50 = 75 neutrons

in a neutral atom,

number of negative electrons = number of positive protons

a) 50 protons, 50 electrons, 75 neutrons

3 0

3 years ago

Lily is trying to measure the volume of her hand. She places it in a can full of water. The volume of water that is __________ i

PolarNik [594]

Answer:

Displaced

Explanation:

A convenient way to measure the volume of an object is to measure the volume of a solid is to immerse the solid into water.

When a solid is immersed in water, it displaces some volume of water. This volume of water displaced is the same as the volume of the object.

For instance, if the volume of water in a measuring cylinder was 25 ml and i added a stone which made the water in the measuring cylinder to rise to 70 ml, it simply means that the volume of the object is 70 ml - 25 ml = 45 ml

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3 years ago

Which of the following is a proton donor. a. Bronsted-Lowry Base 6 Bronsted-Lowry Acid c. Lewis Acid d. Lewis Base

Margarita [4]

Answer:

Bronsted-Lowry acid

Explanation:

Bronsted-Lowry Base -

According to Bronsted-Lowry theory of acids and bases:

Acids are those substances which donate proton in the solution whereas bases are those substances which accept proton in the solution.

Consider an example,

$HCO_3^{-} + HOH\; \rightarrow H_2CO_3 + OH^{-}\\$

HCO3- behave as base as it accepts proton in the reaction whereas HOH behaves as acid as it releases proton.

According to Lewis theory of acids and bases:

Acids are electron acceptor and bases are electron donar. Acids are generally electron deficient species whereas Lewis are chemical species having lone pair of electrons.

For example, AlCl3 is behave as Lewis acid because of being electron deficient species.

NH3 is a Lewis base because of presence of lone pair of electrons.

Therefore, among given options, Bronsted-Lowry acid is the correct option.

3 0

4 years ago

How does molecular motion change during the freezing process?

AlladinOne [14]

Answer:

the molecules stop sliding and tumbling all over each other

Explanation:

7 0

3 years ago

Read 2 more answers