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Bess [88]
3 years ago
5

What is the defining characteristic of an exothermic reaction.

Chemistry
1 answer:
xenn [34]3 years ago
7 0
Heat gets given off or emitted during the reaction
Hope this helps and don’t forget to mark as brainliest if you thought it was most helpful :)
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Question is chemistry:
Black_prince [1.1K]

H2S hydrogen sulfide gas has a higher lattice energy because

Formula: H2S

Molar mass: 34.1 g/mol

Boiling point: -76°F (-60°C)

Melting point: -115.6°F (-82°C)

Density: 1.36 kg/m³

Soluble in: Water, Alcohol

8 0
3 years ago
A car rolls down a ramp. What is the force acting on the car that causes the movement down the ramp?
Komok [63]
The answer to your question is gravity. you are welcome. :-D
6 0
3 years ago
The rms (root-mean-square) speed of a diatomic hydrogen molecule at 50∘c is 2000 m/s. Note that 1. 0 mol of diatomic hydrogen at
Leno4ka [110]

The rms speed will be 500 m/s

<h3>What is Root mean square speed ?</h3>

Root mean square speed (Vrms) is defined as the square root of the mean of the square of speeds of all molecules.

Root mean square speed (vrms) Root mean square speed (vrms) is defined as the square root of the mean of the square of speeds of all molecules

It is given that

Speed of a diatomic hydrogen molecule,2000 m/s

Mol of diatomic hydrogen,1.0

Temperature,50°C

The rms speed of diatomic molecule will be:

√(3KT)/( m)

The translational kinetic energy of a gas molecule is given as:

K.E = (3/2)KT

K.E = (1/2) mv²

where,

v = root mean square velocity

m = mass of one mole of a gas

(3/2)KT = (1/2) mv²

v = √(3KT)/m  

FOR H₂:  v = √(3KT)/m = 2000 m/s  

Here,

mass of 1 mole of oxygen = 16 m

velocity of oxygen = √(3KT)/(16 m)

velocity of oxygen = (1/4) √(3KT)/m

velocity of oxygen = (1/4)(2000 m/s) = 500 m/s

Therefore the  rms (root-mean-square) speed of a oxygen molecule at 50∘c is 500m/s.

To know more about Root mean square speed

brainly.com/question/7213287

#SPJ4

3 0
2 years ago
How many grams of Ar are there in 2.25 moles of Ar?
nydimaria [60]

Answer:

89.88 g

Explanation:

Atomic Mass of Ar: 39.948

Mass = moles * AM

Replacing moles = 2.25 and AM = 39.948 you get the mass of Ar:

Mass = 2.25 * 39.948

Mass = 89.88 g

8 0
2 years ago
What is the chemical name for K2Se
Oduvanchick [21]

Answer:

Potassium selenide

Explanation:

Potassium selenide (K2Se)

6 0
2 years ago
Read 2 more answers
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