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Julli [10]
3 years ago
9

1.248×10^-2÷7.8×10^-7 express in scientific notation

Chemistry
1 answer:
vaieri [72.5K]3 years ago
8 0

try using a calculator

LOL

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What would the molecular formula be if lithium and sulfur reacted to form a neutral compound?
Fed [463]

Answer:

D

Explanation:

Lithium has one valence electron, so it has one to give away to have an outer shell of 8.

Sulfur has 6 valence electrons, so it needs 2 to get an outer shell of 8.

If we have two Li, that means sulfur will get 2 e- and Li will give away 2 e-, so the formula is Li₂S.

3 0
3 years ago
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Arrange these compounds by their expected boiling point. Highest boiling point Lowest boiling point CH3OH, CH3CI CH4.
PSYCHO15rus [73]

Answer: The given compounds are arranged according to decreasing boiling point as CH_{3}OH > CH_{3}Cl > CH_{4}.

Explanation:

The temperature at which vapor pressure of a substance becomes equal to the atmospheric pressure is called boiling point.

Stronger is the intermolecular forces present the atoms of a molecule more heat will be required by it to break the bond between its atoms. Hence, more will the boiling point of the molecule.

In CH_{3}OH (methanol), there is hydrogen bonding present which is a stronger force. So, it will have highest boiling point as compared to CH_{3}Cl and CH_{4}.

In CH_{3}Cl (chloroform), there is more electronegative atom attached (Cl) is attached to less electronegative atom (C and H). So, electrons are more pulled towards the chlorine atom. So, boiling point of  CH_{3}Cl is more than methane (CH_{4}).

Thus, we can conclude that given compounds are arranged according to decreasing boiling point as CH_{3}OH > CH_{3}Cl > CH_{4}.

8 0
3 years ago
What do we mean when we say atoms bond together?
Delicious77 [7]

Answer:

When two or more atoms chemically bond together, they form a molecule. Sometimes the atoms are all from the same element.

A Compound.

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For example, when three oxygen atoms bond together, they form a molecule of ozone (O3). If a molecule forms from atoms of two or more different elements, we call it a compound.

Hope this helps!!

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3 years ago
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Here you go here is calculate

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