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sweet-ann [11.9K]
3 years ago
9

What element is helpful for tooth decay

Chemistry
1 answer:
emmainna [20.7K]3 years ago
3 0
Fluoride and calcium are both helpful for stopping tooth decay
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Consider some unknown compound containing only copper and oxygen. In order to determine the empirical formula, a sample of the c
Lina20 [59]

The number of mole of copper in the sample is 0.008 mole.

Mole is simply defined as the unit of amount in a substance.

The mole of a substance can be obtained by dividing the mass of the subtance by its molar mass i.e

Mole = mass / molar mass

With the above information, we can obtain the mole of copper in the compound as follow:

Mass of copper = 0.5066 g

Molar mass of copper = 63.5 g/mol

<h3>Mole of copper =? </h3>

Mole = mass / molar mass

Mole of copper = 0.5066 / 63.5

<h3>Mole of copper = 0.008 mole </h3>

Therefore, 0.008 mole of copper was initially present in the compound.

Learn more: brainly.com/question/14295066

5 0
3 years ago
WHEN IN FRICTION not useful
Paladinen [302]
Friction is not useful in Machinery sometimes, Since it leads to the wear and tear of machine parts.
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3 years ago
Oceń prawdziwość podanych informacji w układzie okresowym pierwiastki chemiczne są złożone według NIK to jących się liczbą atomo
cluponka [151]
Wow. What language is this?
3 0
2 years ago
What do I do if I like someone but they think your annoying
Mrrafil [7]

Answer:

Say sorry, and then send them a gift.

Explanation:

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2 years ago
Your friend, a business major, overhears you talking about chemical energy and food and decides to develop a new super food for
RUDIKE [14]

Answer:

The question is incomplete. The response options are as follows:

I. C-O or C=O

II. C-C

III. C-H

IV. O-H

The answer is: IV>III>I>II

Explanation:

V) O-H is a hydrogen bridge. The hydrogen bridge is characterized by being similar to dipole-dipole bonds.

III) C-H is an ionic bond. The ionic bond occurs when they fuse together due to electron transfer.

I) C=O is a covalent bond. The covalent bond happens when two atoms bond together to create a molecule, sharing its electrons that are in its most superficial layer,

II) C-C is covalent bond.

7 0
3 years ago
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