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Sati [7]
3 years ago
10

The force that holds paticles together in the atomic nuecleaus?

Chemistry
1 answer:
kherson [118]3 years ago
7 0

Explanation:

i believe you meant particles*

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In a chemical change
zubka84 [21]

Answer:

the product are different substances frim the starting materails

7 0
3 years ago
Read 2 more answers
An electron na hydrogen atom moves from level to level 4 The electron then drops from level 4 to level 2. Which statement
Vsevolod [243]

Answer:

The energy absorbed in the first move is greater than the energy released in the second move.

Explanation:

The greater the level number the greater the energy.

A movement up a level requires energy so energy id absorbed.

Dropping down a level releases energy.

3 0
3 years ago
A 1.555-g sample of baking soda decomposes with heat to produce 0.991 g Na2CO3. Refer to Example Exercise 14.l and show the calc
Sunny_sXe [5.5K]

Answer:

a) 101%

b)59.7%

Explanation:

The equation for the thermal decomposition of baking soda is shown;

2NaHCO3 → Na2CO3 + H2O + CO2

Number of moles of baking soda= mass/molar mass= 1.555g/84.007 g/mol = 0.0185 moles

From the reaction equation;

2 moles of baking soda yields 1 mole of sodium carbonate

0.0185 moles of baking soda will yield = 0.0185 moles ×1 /2 = 9.25 ×10^-3 moles of sodium carbonate.

Therefore, mass of sodium carbonate= 9.25 ×10^-3 moles × 106gmol-1= 0.9805 g of sodium carbonate. This is the theoretical yield of sodium carbonate.

%yield = actual yield/theoretical yield ×100

% yield = 0.991/0.9805 ×100

%yield = 101%

Since ;

2NaHCO3 → Na2CO3 + H2O + CO2

And H2O + CO2 ---> H2CO3

Hence I can write, 2NaHCO3 → Na2CO3 + H2CO3

Molar mass of H2CO3= 62.03 gmol-1

Molar mass of baking soda= 84 gmol-1

Therefore, mass of baking soda=

0.325/62.03 × 2 × 84 = 0.88 g of NaHCO3

% of NaHCO3= 0.88/1.473 × 100 = 59.7%

7 0
3 years ago
Which statement about entropy is correct? - Entropy is sometimes described as the degree of randomness in a system. - solids are
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Answer: Entropy is sometimes described as the degree of randomness in a system.

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2 years ago
Non motile in an sentences
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Motile bacteria have flagella, while nonmotile bacteria do not.

Explanation:

4 0
3 years ago
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