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il63 [147K]
3 years ago
12

Who was the first chemist to organize elements by atomic number?

Chemistry
2 answers:
NemiM [27]3 years ago
7 0

Answer:

chemist Dimitri Mendeleev

  • XxAnimexX
Finger [1]3 years ago
6 0

Answer:

Chemist Dimitri Mendeleev

Explanation:

He started the development of the periodic table, arranging chemical elements by atomic mass.

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Small quantities of hydrogen gas can be prepared in the lab by addition of hydrochloric acid to zinc. The gas is typically colle
madam [21]

Answer:

0.214 L

Explanation:

Step 1: Write the balanced equation

This is a single displacement reaction.

Zn(s) + 2 HCl(aq) ⇒ ZnCl₂(aq) + H₂(g)

Step 2: Calculate the moles corresponding to 0.625 g of Zn

The molar mass of Zn is 65.38 g/mol.

0.625 g × 1 mol/65.38 g = 9.56 × 10⁻³ mol

Step 3: Calculate the moles of H₂ produced from 9.56 × 10⁻³ moles of Zn

The molar ratio of Zn to H₂ is 1:1. The moles of H₂ produced are 1/1 × 9.56 × 10⁻³ mol = 9.56 × 10⁻³ mol.

Step 4: Calculate the volume occupied by 9.56 × 10⁻³ moles of hydrogen

Assuming standard pressure and temperature, 1 mole of hydrogen occupies 22.4 L.

9.56 × 10⁻³ mol × 22.4 L/1 mol = 0.214 L

8 0
3 years ago
How are covalent network solid similar to ionic solids?
olasank [31]

Ionic solids have high melting points and are rather hard. ... Covalent solids comprise two- or three-dimensional networks of atoms held together by covalent bonds; they tend to be very hard and have high melting points

7 0
3 years ago
Why don’t these gases tend to form chemical bonds?
erik [133]

If you’re talking about noble gases, the answer would be A. Since noble gases already have 8 electrons, they don’t tend to form chemical bonds. And elements need just 8 electrons on there shells to be stable.

6 0
4 years ago
Identify if you should use millimeters, centimeters, meters, or kilometers to measure each example.
ira [324]

Answer:

1. unless you live right around the block, distance from home to school should be in kilometers.

2. centimeters

3. millimeters

4. meters (the average is about 2 meters)

3 0
3 years ago
Read 2 more answers
On the bottom beam of the triple beam balance, each small division stands for
Rainbow [258]

Answer:

Hello There!!

Explanation:

I believe the answer is D.) one-tenth of a gram.

hope this helps,have a great day!!

~Pinky~

8 0
3 years ago
Read 2 more answers
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