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3 years ago

Which pair of elements has the most similar properties?

Chemistry

2 answers:

nexus9112 [7]3 years ago

8 0

Answer:A) N and P

Explanation:

N and P, because they are in the same group on the periodic table. This is because they both have 3 valence electrons, and properties of elements are dependent partly on the number of valence electrons they have.

stiks02 [169]3 years ago

7 0

Answer:

So, the elements with similar properties to sodium (Na) are all of those elements in the same Group.

Explanation:

The ones "most" similar would be the ones closest in mass as well. Those would be Lithium (Li) and Potassium (K).

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Which is a process that converts sunlight energy into a compound that stores chemical energy?.

RoseWind [281]

Answer:

Photosynthesis

Explanation:

If thats one of the options, thats the answer. Let me know if its not, and I'll be glad to help :)

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2 years ago

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How can you distinguish between a physical change and a chemical change?

AleksAgata [21]

Answer:

Physical Change

When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged.
Physical change is a temporary change.
A Physical change affects only physical properties i.e. shape, size, etc.
A physical change involves very little to no absorption of energy.
Some examples of physical change are freezing of water, melting of wax, boiling of water, etc. .
In a physical change, no new substance is formed.
Physical change is easily reversible i.e original substance can be recovered.

Chemical Change

When a substance undergoes a chemical change, its molecular composition is changed entirely. Thus, chemical changes involve the formation of new substances.
.A chemical change is a permanent change.
Chemical change both physical and chemical properties of the substance including its composition
During a chemical reaction, absorption and evolution of energy take place.
A few examples of chemical change are digestion of food, burning of coal, rusting, etc.
A chemical change is always accompanied by one or more new substance(s).
Chemical changes are irreversible i.e. original substance cannot be recovered.

8 0

3 years ago

Which of the following is a measure of the average kinetic energy of the particles in a sample of matter?

cestrela7 [59]

Answer:

Option D. temperature

Explanation:

Indeed it is generally established that temperature is a measure of the kinetic energy ot the particles.

The kinetic energy of a particle is proportional to the product of the mass and the square of the speed. Mathematically, the kinetic energy, KE, is:

KE = (1/2) m × v²

Where m is the mass and v the speed of the particle.

In a sample of matter, not all the particles have the same speed, hence not all the particles have the same kinetic energy.

The kinetic energy and the temperature are related by the Boltzman equation:

KE = (3/2)KT

Where K is a constant (Boltzman constant) and T is the absolute temperature.

Therefore, as you can see from the last equation, the temperaure is a measure of the averate kinetic energy of the particles in a sample of matter.

This is, at a certain temperature, every substance has the same average kinetic energy.

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3 years ago

Question: Which of the following could be a phenotype?

Lostsunrise [7]

Answer:

Punnett Square

Explanation:

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3 years ago

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Is cake ingredients (before blending) a mixture or solution

Xelga [282]

Answer:

I think it would be a solution..

But I'm not sure.

I think that because you said before before blending.

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3 years ago