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MrRa [10]
3 years ago
14

Isotopes of the same element have a different number of ______​

Chemistry
1 answer:
qaws [65]3 years ago
5 0

Answer:

atomic weight..................

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Four metal cubes, each at a different starting temperature, are placed in contact with each other. Which of the following descri
xz_007 [3.2K]

The answer should go like...

<em>Cube #1 to Cube #3</em>

<em>Cube #2 to Cube #1</em>

<em>Cube #2 to Cube #4</em>

<em>Cube #4 to Cube #3.</em>

7 0
1 year ago
Using resonance, select the most acidic protons in the hexane-2,4-dione molecule. The most acidic proton is the one that, upon r
kondor19780726 [428]

Answer:

Protons 4 or 5 are most acidic.

Explanation:

As mentioned there are four types of hydrogen in Hexane-2,4-dione.

The numbering are shown in the figure for your better understanding.

As shown in the figure if we remove the proton from carbon number 3 (protons number 4 or 5), it will result in formation of a carbanion. This carbanion is stabilized due to presence of -I group oxygen and there is possibility of resonance (as shown).

Thus protons 4 or 5 are most acidic.

5 0
4 years ago
Why are sodium (Na) and potassium (K) in the same group on the periodic table?​
Artyom0805 [142]

Explanation:

Sodium and potassium are in the same group on the periodic table because they both have similar number of valence electrons (1 electron) in their shells

Na = 2,8,1

K = 2,8,8,1

7 0
2 years ago
You have 40 g of a radioisotope. If the half-life of this radioisotope is 4 days, how many grams will remain after 12 days?
anygoal [31]
With reference to radioactive material, half-life is the time required to 50% depletion of initial amount of material. 

Given: Initial amount of radioactive material = 40 g
Half life = 4 days.

Therefore, After 4 days, amount of compound left = 40/2 = 20 g
After 8 days, i.e 2 half-life, amount of compound left = 20/2 = 10 g
Finally after 12 days, i.e. 3 half-life, amount of compound left = 10/2 = 5 g

Thus, 5 <span>grams will remain after 12 days</span>
5 0
3 years ago
How many oxygen atoms are in 1.60 g of quartz? hints?
Naily [24]
Quartz has the formula SiO2
From the periodic table:
mass of oxygen = 16 grams
mass of silicon = 28.0855 grams
Mass of one mole of quarts = 28.0855 + 2(16) = 60.0855 grams

number of moles = mass / molar mass
number of moles = 1.6 / 60.0855 = 0.0266 moles

Each mole of quartz contains Avogadro's number of atoms.
Therefore:
number of atoms in 1.6 g = 1.6 x 6.02 x 10^23 = 1.603 x 10^22 atoms
4 0
3 years ago
Read 2 more answers
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