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Shalnov [3]
2 years ago
12

how was it possible that Mendeleev was able to predict the properties of elements that no one knew about

Chemistry
1 answer:
andrew-mc [135]2 years ago
7 0
<span>He used the patterns he found in properties of known elements to predict the properties of unknown elements.</span>
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No links please. How many moles of methane (CH4) are in 7.31x10^25 molecules?
ad-work [718]

Answer:

molar mass of methane CH4

= C + 4 H  

= 12.0 + 4 x 1.008

= 12.0 +  4.032

= 16.042g/mol

7.31 x 10^25 molecules x             1 mole  CH4      = 121.43 moles

                                      6.02 x 10^23 CH4 molecules

121.43 moles CH4 are present.

Explanation:

not to certain if this is right or not.. but hope it helps!

4 0
2 years ago
Which of the following is true about the distribution of water in the hydrosphere?
mr Goodwill [35]
<span>The answer is: C. The amount of water in the hydrosphere remains constant. 

</span>The hydrosphere denotes the entire water available worldwide in lakes and streams, subsurface water, the ice of glaciers, and water vapor in the atmosphere. The water cycle is the process that converts liquid water to atmospheric water vapor (and vice versa) throughout the world.
5 0
2 years ago
A monomer is added to the end of a polymer chain in a __________ reaction.
aalyn [17]
Dehydration reaction
6 0
2 years ago
Read 2 more answers
Which which atom is held together by covalent bonds?​
Sedaia [141]
Covalent bonds are strong bonds. Atoms that share pairs of electrons form molecules. A molecule is a group of atoms held together by covalent bonds. A diatomic molecule is a molecule containing only two atoms.
4 0
3 years ago
4) A granola bar has a mass of 42.9 g and the granola bar contains 26.20% honey
nata0808 [166]

<u>Answer:</u>

The percentage of honey in one granola bar is 26.02 percent.  

<u>Explanation:</u>

The weight of 1 granola bar is 42.9 grams. The grams of honey that is present in one granola bar is equal to 26.02 percent of 42.9 = 11.16 g

Now the amount of honey in the factory is given as 189.5g the weight of total granola bars would be

                                     = 42.9/11.16 x 189.5= 728.25

So no. of granula bars =728.25/42.9 =16.9 that can be Approximated to nearly 17

Now if one box has 6 bars then 17 bars will have to fit inside three boxes  

7 0
2 years ago
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