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4 years ago

A change in matter that produces one or more new substances is a ???

Chemistry

2 answers:

Dvinal [7]4 years ago

8 0

Chemical reaction, generally speaking. It's a vague definition, but it's easy to remember.

Sliva [168]4 years ago

8 0

The answer is Chemical change or a Chemical reaction. I hope I helped in any way. :)

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Which of the following tends to form anions when bonding with other elements?

yarga [219]

Answer: it’s D

Explanation:

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3 years ago

Read 2 more answers

The energy of an electron in a multielectron atom is determined by

Wewaii [24]

Answer:

by principal quantum number (n) and azimuthal quantum number (l)

Explanation:

I used the web to answer so I'm not sure if this is right

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3 years ago

U-235 undergoes many different fission reactions. For one such reaction, when U-235 is struck with a neutron, Ce-144 and Sr-90 a

Lostsunrise [7]

Explanation:

A nuclear fission reaction is defined as the reaction in which a heavy nucleus splits into small nuclei along with release of energy.

The given reaction is $^{235}_{92}U + ^{1}_{0}n \rightarrow ^{144}_{58}Ce + ^{90}_{38}Sr + x^{1}_{0}n + y^{0}_{-1}\beta$

Now, we balance the mass on both reactant and product side as follows.

235 + 1 = $144 + 90 + (x \times 1) + (y \times 0)$

236 = 234 + x

x = 236 -234

= 2

So, now we balance the charge on both reactant and product side as follows.

92 + 0 = $58 + 38 + (x \times 0) + (y \times -1)$

92 = 96 - y

y = 4

Thus, we can conclude that there are 2 neutrons and 4 beta-particles are produced in the given reaction.

Therefore, reaction equation will be as follows.

$^{235}_{92}U + ^{1}_{0}n \rightarrow ^{144}_{58}Ce + ^{90}_{38}Sr + 2^{1}_{0}n + 4^{0}_{-1}\beta$

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3 years ago

What are the four factors that affect the natural selection?

BaLLatris [955]

Answer:

• potential for a species to increase in number

• the heritable genetic variation/ which results from mutation in dna

• the size of a population increases

• competiton for resources that are limited in that specific environment.

Explanation:

these are all factors that would affect natural selection although there are many more.

6 0

3 years ago

Gravity is a force that helps to hold the universe together.

My name is Ann [436]

Mhm, it keeps the planets in place and circle around the Sun's gravitational pull, like how the Earth's small-like gravitational pull keeps the moon to circle around our planet, and as a perk it makes the 80% water that around this whole place to have high and low tides.

- Sincerely, Ouma

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3 years ago