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4 years ago

How do you understand electrons and the periodic table? I am lost.

Chemistry

1 answer:

puteri [66]4 years ago

8 0

Answer:

Explanation:

Electron configurations and the periodic table. Elements are placed in order on the periodic table based on their atomic number, how many protons they have. In a neutral atom, the number of electrons will equal the number of protons, so we can easily determine electron number from atomic number.

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Can you discribe physical and chemical properties

vodka [1.7K]

Physical is something you can feel chemical is like a gas

3 0

3 years ago

As a result of the reaction of 109.5 grams of a solution of hydrochloric acid with an excess of zinc, a gas with a volume of 3.3

MArishka [77]

Explanation:

Volume of gas produced = 3.36 L

as molar volume of gas at STP is 22.4 L

no of moles of H2 = 3.36 ÷ 22.4 = 0.15 mole

from balanced reaction equation

Zn + 2HCl = ZnCl2 + H2

Ratio of no of moles between H2 : HCl is 1:2

as H2 moles = 0.15 mole

HCl moles reacted = 0.15 × 2 = 0.3 mole

as HCl molar mass = 1 + 35.5 = 36.5 g/mole

so Mass of 0.3 mole of HCl = 0.3 × 36.5 = 10.85 gram

fraction of HCl in Solution

= 10.85 ÷ 109.5 = 0.1

0.1 ×100 so HCl is 10% of solution mass

6 0

3 years ago

Assuming no change in temperature and pressure, calculate the volume of O2 (in liters) required for the complete combustion of 1

Natali [406]

Answer : The number of moles of oxygen gas required are, 4.49 moles.

Explanation :

The balanced chemical reaction is:

$2C_4H_{10}(g)+13O_2(g)\rightarrow 8CO_2(g)+10H_2O(l)$

First we have to calculate the moles of butane gas.

As we know that, 1 mole of substance occupies 22.4 L volume of gas.

As, 22.4 L volume of butane gas present in 1 mole of butane gas

So, 15.5 L volume of butane gas present in $\frac{15.5}{22.4}=0.692$ mole of butane gas

Now we have to calculate the moles of oxygen gas.

From the balanced chemical reaction we conclude that,

As, 2 moles of butane gas react with 13 moles of oxygen gas

So, 0.692 moles of butane gas react with $\frac{13}{2}\times 0.692=4.49$ moles of oxygen gas

Therefore, the number of moles of oxygen gas required are, 4.49 moles.

3 0

4 years ago

How much of a 60.0 gram sample of Carbon-14 DECAYED after 17,100 if 5

zlopas [31]

The answer is A.7.50

3 0

3 years ago

How would one convert 36 yd to centimeters (2.54 cm = 1 in)

ValentinkaMS [17]

I would go yards to feet, feet to inches, inches to centimeters. So 36 yards is 108 feet. There are 12 inches in a foot so 1,296 inches in 108 feet. Multiply that by 2.54 centimeters to get 3,291.84 centimeters in 36 yards.

3 0

4 years ago

Read 2 more answers