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Gre4nikov [31]
3 years ago
12

Which description best matches Democritus idea of the atom?

Chemistry
1 answer:
puteri [66]3 years ago
4 0
Democritus said that the atom was just a sphere.
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Which level of protein structure do beta-pleated sheets and alpha helices represent?
pychu [463]
The primary structure is the amino acids' unique sequence. The polypeptide's local folding to form structures such as the α-helix and β-pleated sheet constitutes the secondary structure. The overall three-dimensional structure is the tertiary structure
3 0
3 years ago
What is the mass of 2.0 moles of CO2
igor_vitrenko [27]
1 mol of CO2 is 44.01g/mol
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6 0
3 years ago
PLEASE HELP!!!!!!!!! WILL MARK BRAINLIEST
frozen [14]

Answer:

19.278049929737628457607385688801

Explanation:

Volume = L * W * H

Volume = 17.78 * 9.21 * 4.45 = 728.70441

Density = Mass / Volume

Mass = 14,048

14,048 / 728.70441 = 19.278049929737628457607385688801

Density = 19.278049929737628457607385688801

7 0
3 years ago
Read 2 more answers
HELP! An atom of vanadium
Zigmanuir [339]

An atom of vanadium (V)  has 23 electrons.

Given :

A vanadium (V) atom with 23 protons and has a net charge of 0.

To find:

The number of electrons in a vanadium atom

Solution:

Number of protons in vanadium atom = 23

The 0 net charge on the atom indicates that the atom has an equal number of protons and electrons which makes it a neutral atom.

Number of electrons in vanadium atom = Number of protons in vanadium atom = 23

An atom of vanadium (V)  has 23 electrons.

Learn more about subatomic particles here:

brainly.com/question/7221719?referrer=searchResults

brainly.com/question/489853?referrer=searchResults

6 0
2 years ago
The half-life of substance-X is 5 minutes. If you start with 20g of substance-X, how much substance-X is leftover after 5 minute
timurjin [86]
<span>At 20g with half-life of 5 minutes there would be 10g leftover in 5 minutes. In 10 mins, there would be 5g leftover. Half-life is actually what it says, it refers to time it takes for half of the active elements, etc to break down at which time the potency of the "product" is half as strong. This term is used mainly with radioactive items or medicines.</span>
4 0
3 years ago
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