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Assoli18 [71]
3 years ago
10

The energy needed to get a reaction started is the

Chemistry
2 answers:
Otrada [13]3 years ago
4 0
The energy needed to get a reaction started is the b. activation energy
Anna71 [15]3 years ago
4 0
The energy needed to get a reaction started is the activation energy. 

A catalyst speeds up a reaction, as well as an enzyme, and chemical energy is just a form of energy. 

Answer: Activation energy 
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A particular energy level in the hydrogen atom has E = -2.42 x 10-19 J. Use Bohr's model of the energy levels in hydrogen to cal
Zepler [3.9K]

Answer:

n=3

Explanation:

The expression for the energy of an electron for the hydrogen atom in the nth orbit is:-

E_n=-2.18\times 10^{-18}\times \frac{1}{n^2}\ Joules

Given that:-

E_n=-2.42\times 10^{-19}\ Joules

Applying in the equation to find the value of n as:-

-2.42\times 10^{-19}=-2.18\times 10^{-18}\times \frac{1}{n^2}

n^2=\frac{2.18\times 10^{-18}}{2.42\times 10^{-19}}

n=\sqrt{\frac{21.8}{2.42}}=3

7 0
3 years ago
PLEASE HELP
devlian [24]
Metals have a low electron affinity- a less likely chance to gain electrons because they want to give up their valence electrons rather than gain electrons, which require more energy than necessary.
6 0
2 years ago
what's the density of an element if a sample has a mass of 43.2 g and a volume of 96.5 mL. (0.45 g/mL)
lisov135 [29]
To find the answer you need to use the formula that will help you to find the density. Density = mass/volume
d = 43.2g/96.5mL = 0.45g/mL
7 0
3 years ago
Can matter be created or<br> destroyed?<br><br> Yes or No
anzhelika [568]

Answer:

No

Explanation:

The same amount of matter is present before and after chemical and physical changes. Matter cannot be created or destroyed

5 0
2 years ago
Read 2 more answers
If 60. liters of hydrogen gas at 546 K is cooled to 273 K at constant pressure, the new volume of the gas would be
Korvikt [17]

Answer:30 L

Explanation:

Initial Volume

=

V

1

=

60

l

i

t

e

r

Initial Temperature

=

T

1

=

546

K

Final Temperature

=

T

2

=

273

K

Final Vloume

=

V

2

=

?

?

Sol:-

Since the pressure is constant and the question is asking about temperature and volume, i.e,

V

1

T

1

=

V

2

T

2

⇒

V

2

=

V

1

⋅

T

2

T

1

=

60

⋅

273

546

=

60

2

=

30

l

i

t

e

r

⇒

V

2

=

30

l

i

t

e

r

Hence the new volume of the gas is

30

l

i

t

e

r

6 0
3 years ago
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