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Alex787 [66]
3 years ago
13

Substance that hasten chemical reaction time without themselves undergoing change are called

Chemistry
2 answers:
Romashka [77]3 years ago
8 0

Answer: catalyst

Explanation:

A catalyst is a substance which increases or hastens the rate of a chemical reaction by taking the reaction through a different path which involves lower activation energy and thus more molecules can cross the energy barrier and convert to products.

Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.

The catalyst itself does not take part in the chemical reaction and is regenerated as such at the end without undergoing any change.

pantera1 [17]3 years ago
4 0
The substance is a catalyst
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a particular application calls for N2 g with a density of 1.80 g/L at 32 degrees C what must be the pressure of the n2 g in mill
baherus [9]

Answer:

1223.38 mmHg

Explanation:

Using ideal gas equation as:

PV=nRT

where,  

P is the pressure

V is the volume

n is the number of moles

T is the temperature  

R is Gas constant having value = 62.3637\text{ L.mmHg }mol^{-1}K^{-1}

Also,  

Moles = mass (m) / Molar mass (M)

Density (d)  = Mass (m) / Volume (V)

So, the ideal gas equation can be written as:

PM=dRT

Given that:-

d = 1.80 g/L

Temperature = 32 °C

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15  

So,  

T = (32 + 273.15) K = 305.15 K

Molar mass of nitrogen gas = 28 g/mol

Applying the equation as:

P × 28 g/mol  = 1.80 g/L × 62.3637 L.mmHg/K.mol × 305.15 K

⇒P = 1223.38 mmHg

<u>1223.38 mmHg must be the pressure of the nitrogen gas.</u>

5 0
3 years ago
What type of energy changes take place when a candle burns
frutty [35]
The two types of energy changes that occur are heat and light changes.
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Convert 798.2 g/m' to kg/cm' using dimensional analysis.
Katyanochek1 [597]

Answer:

798.2 grams / meter = 0.008 kilograms / centimeter

Explanation:

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3 years ago
Which of the following uses a nonrenewable energy source to generate energy
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The answer would be B
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An element with 11 neutrons, 11 protons, and 11 electrons would have a mass number o?
vova2212 [387]

The mass number of element  is 22.

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Mass number = number of proton/electron + number of neutrons

Mass number = 11 + 11 = 22

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