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Nataly [62]
3 years ago
13

As an electron in an atom moves from the ground state to the excited state, the electron (1) gains energy as it moves to a highe

r energy level (2) gains energy as it moves to a lower energy level (3) loses energy as it moves to a higher energy level (4) loses energy as it moves to a lower energy level
Chemistry
1 answer:
yawa3891 [41]3 years ago
5 0
Electron requires energy to move from ground state to excited state(higher energy levels). Hence option 1 is correct. Hope this helps!
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How does concentration affect our daily lives in science?​
statuscvo [17]

1. <em>Increasing the concentration of one or more reactants will often increase the rate of reaction. This occurs because a higher concentration of a reactant will lead to more collisions of that reactant in a specific time period. </em>

<em>2. Physical state of the reactants and surface area.</em>

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3 years ago
Differentiate between group and period​
Katarina [22]

Answer:

A group is a vertical column of elements on the periodic table whereas a period is a horizontal row of elements on the periodic table.

4 0
3 years ago
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Rom the equation for the decomposition of nahco3, what is the weight in grams lost when 1.000 g of nahco3 is decomposed thermall
Annette [7]
1) Chemical reaction (thermal decomposition)

2NaHCO3 (s) ---> Na2CO3 (s) + H2O (g) + CO2(g)

2) Reasoning

The lost of mass is due to the lost of the gases H2O and CO2.

So, you can calculate the mass of Na2CO3 obtained from 1.000 g NaHCO3, and the difference will be the mass lost.

2) Convert 1.000 g of NaHCO3 to number of moles

molar mass NaHCO3: 1*23g/mol + 1*1g/mol + 1*12g/mol + 3*16g/mol = 84 g/mol

number of moles = mass in grams / molar mass = 1.000 g / 84 g/mol = 0.01190 moles

3) Use therotecial molar ratios:

2 moles NaHCO3 : 1 mol Na2CO3

=> 0.01190 mol NaHCO3 / x = 2 mol NaHCO3 / 1mol Na2CO3

=> x = 1mol Na2CO3 * 0.01190 mol NaHCO3 / 2 mol NaHCO3

=> x = 0.00595 mol Na2CO3

4) Convert 0.0595 mol Na2CO3 to mass

molar mass Na2CO3: 2*23g/mol + 1*12g/mol + 3*16g/mol = 106 g/mol

mass in grams = number of moles * molar mass = 0.00595 mol * 106 g/mol = 0.6307 g

5) lost mass

1.000g - 0.6307g = 0.3693 g

Answer: 0.3693 g
3 0
3 years ago
Activity 1.3 Put an unlit incense stick in a corner of your class. How close do you have to go near it so as to get its smell? N
lidiya [134]
For the first one you have to be very close to smell it, when lit the aroma fills the class because there is no ventilation and how there is no way for the gas to leave the room
3 0
3 years ago
Read the scenario, then answer the questions. A 2 kg ball is thrown upward with a velocity of 15 m/s. What is the kinetic energy
HACTEHA [7]

Answer:

<h2>225 J</h2>

Explanation:

The kinetic energy of an object can be found by using the formula

k =  \frac{1}{2} m {v}^{2}  \\

m is the mass

v is the velocity

From the question we have

k =  \frac{1}{2}  \times 2 \times  {15}^{2}  \\  = 1 \times 225 \\  = 225 \:  \:  \:  \:  \:  \:  \:  \:

We have the final answer as

<h3>225 J</h3>

Hope this helps you

3 0
3 years ago
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