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pshichka [43]
3 years ago
14

Enzymes allow chemical reactions to occur _____?

Chemistry
2 answers:
kykrilka [37]3 years ago
7 0

a is the answer

hope it helps

Ratling [72]3 years ago
4 0
A. They speed up chemical reactions
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Which of the following trends can be identified on the periodic table?
Jet001 [13]

Answer:

D) atomic radii increase from top to bottom of a group

Explanation:

Atomic radii trend along group:

As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.

As the size of atom increases the ionization energy from top to bottom also  decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.

Other options are incorrect because,

A) atomic radii increase from left to right across the period

Correct = atomic radii decreases from left to right across the period

B) ionization energy increases from top to bottom within a family

Correct =  ionization energy decreases from top to bottom within a family

C) electronegativity decreases from left to right across a period

Correct = electronegativity increases from left to right across a period

8 0
3 years ago
A student makes a list of all the soil layers in a temperate region Which layer would be located farthest from the surface of th
Novay_Z [31]

Answer: Bedrock

Explanation: Bedrock is the lowest layer of rock

5 0
3 years ago
Example of a chemical change that you encounter everyday
dexar [7]
Food metabolising inside of your liver.
7 0
3 years ago
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How does helium form (5-8) sentences
Firlakuza [10]
On Earth it is relatively rare—5.2 ppm by volume in the atmosphere. Most terrestrial helium<span> present today is created by the natural radioactive decay of heavy radioactive elements (thorium and uranium, although there are other examples), as the alpha particles emitted by such decays consist of </span>helium<span>-4 nuclei.</span>
7 0
3 years ago
Metamorphic rock is formed from the weathering, erosion and cementing of sediments.
Alex Ar [27]

Answer:

False

Explanation:

Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors.

This question is reffering to sedimentary rocks, so it's false.

3 0
3 years ago
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