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olga2289 [7]
3 years ago
6

How did the work of Dmitri Mendeleev differ from that of John Newlands in the development of the periodic table?

Chemistry
1 answer:
Vladimir79 [104]3 years ago
8 0

Answer: Mendeleev predicted elements that would later be discovered.

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I need help with both questions
a_sh-v [17]

Answer:

not sure about 6 but 7 should be c

Explanation:

..

6 0
3 years ago
Calculate the hydroxide ion concentration of a 0.200 M solution of HCIO4
Aleksandr [31]

The concentration of hydroxide ion is  5  \times 10^ − 14  M.

<u>Explanation:</u>

Consider the equilibrium of this acid's dissociation,

                          H C l O 4  ⇌  H +  +  C l O  4 -

Moreover, let's assume that  H C l O 4  is a strong acid and will fully dissociate.

Hence,

                              [ H + ]  =  0.20  M

Now, recall,  

                  K w  =  [ H + ] [ O H − ]  =  1.0  \times 10 ^− 14

Hence,

                  ⇒ [ O H − ]  =  K w  / [ H + ]  = 5  \times 10^ − 14  M.

7 0
3 years ago
Do you think thermal expansion affects all states of matter or just the solid? Explain your thinking.
torisob [31]

Answer:

All three states of matter (solid, liquid and gas) expand when heated. The atoms themselves do not expand, but the volume they take up does.

When a solid is heated, its atoms vibrate faster about their fixed points. The relative increase in the size of solids when heated is therefore small. Metal railway tracks have small gaps so that when the sun heats them, the tracks expand into these gaps and don’t buckle.

Liquids expand for the same reason, but because the bonds between separate molecules are usually less tight they expand more than solids. This is the principle behind liquid-in-glass thermometers. An increase in temperature results in the expansion of the liquid which means it rises up the glass.

Molecules within gases are further apart and weakly attracted to each other. Heat causes the molecules to move faster, (heat energy is converted to kinetic energy) which means that the volume of a gas increases more than the volume of a solid or liquid.

However, gases that are contained in a fixed volume cannot expand - and so increases in temperature result in increases in pressure.:

5 0
3 years ago
What does data on climate change mean
ElenaW [278]

Answer:

Direct statistics on climate change.

How the world is effected or impacted by climate change.

How serious the topic is etc.

You can look at certain projects that people are doing to help or organizations as well.

Explanation:

5 0
3 years ago
A(n) _____ is a material that contains only one kind of atom
Alenkinab [10]
"only one kind of atom" as in only one element, right?
That would be a diatomic molecule.
4 0
2 years ago
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