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3 years ago

What is a substance that reduces the amount of activation energy in a chemical reaction called?

Chemistry

2 answers:

astraxan [27]3 years ago

5 0

Answer: Catalyst

Explanation: Catalyst is a substance which enhances the speed of Chemical reaction without consuming in the Reaction and it is regenerated after completion of Reaction and it is reused further cycle of reaction.

So catalyst reduces the activation energy by speed up the reaction

FinnZ [79.3K]3 years ago

3 0

The answer is catalyst

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Two major discoveries of the gold foil experiment

tiny-mole [99]

Rutherford's gold foil experiment proved that there was a small, dense, positively charged nucleus at the center, which contained most of the mass of the atom. Which contained electrons orbiting the nucleus.

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4 years ago

if 0.582 moles of zinc reacts with excess lead(IV) sulfate how many grams are zinc sulfate would be produced? can someone help m

love history [14]

Balanced equation:
Pb(SO₄)₂ + 2 Zn → 2 ZnSO₄ + Pb
From the equation we found that 2 moles of Zn form 2 moles of ZnSO₄
so 0.582 mole of Zn will produce 0.582 ZnSO₄
Molar mass of ZnSO₄ = 161.47 g/mole
Mass of ZnSO₄ formed = 161.47 x 0.582 = 94.0 grams

7 0

3 years ago

Calculate the percent yield if 52.9 g of ethanol reacts to produce 26.7 g of ether.

blagie [28]

Answer:

The % yield is 62.7 %

Explanation:

Step 1: the balanced equation

2CH3CH2OH(l) → CH3CH2OCH2CH3(l) + H2O(l)

Step 2: Data given

mass of ethanol = 52.9 grams

molar mass of ethanol = 46.07 g/mol

mass of ether = 26.7 grams

Molar mass of ether = 74.12 g/mol

Step 3: Calculate moles of ethanol

Number of moles = Mass / molar mass

Moles of ethanol = 52.9 grams / 46.07 g/mol

Moles of ethanol = 1.15 moles

Step 4: Calculate moles of ether

For 2 moles of ethanol consumed, we have 1 mole of ether produced

For 1.15 moles of ethanol consumed, we have 1.15/2 = 0.575 moles of ether produced

Step 5: Calculate mass of ether

Mass = moles * Molar mass

Mass ether = 0.575 moles * 74.12 g/mol = 42.62 grams = theoretical yield

Step 6: Calculate % yield

% yield = (26.7 / 42.62) * 100 = 62.7%

The % yield is 62.7 %

6 0

4 years ago

Check all of the boxes that are true about the proton:

vovikov84 [41]

Answer:

it is outside the nucleus F

it has a positive charge T

it has no mass F

it has a negative charge F

it is inside the nucleus ...it is part OF the nucleus.

it is the same as the atomic number T

it is the same as the number of neutrons F

75% of the isotopes have a mass ima just guess cuz i dunno about this one...i think it matters on the atom element.

Explanation:

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3 years ago

Robin and Alex are discussing how water molecules form when hydrogen and oxygen atoms combine. Robin writes the following chemic

Likurg_2 [28]

For every two molecules of water formed, one hydrogen atom is needed.

Answer: Option C.

Explanation:

The water particle is very simple and basic. A particle is a bit of issue that contains at least two iotas. The logical name for water is H2O. It is called H2O since it has two iotas of hydrogen (H) and one molecule of oxygen (O). There are a great many these atoms in a single drop of water.

A water molecule is formed when two atoms of hydrogen bond covalently with an atom of oxygen.

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4 years ago