All categories

2 years ago

What happens when a catalyst is used in a reaction?.

1 answer:

6 0

A catalyst is a substance that increases the rate of a chemical reaction by lowering the activation energy without being used up in the reaction. After the reaction occurs, a catalyst returns to its original state and so catalysts can be used over and over again.

You might be interested in

Fe(NO3)2 not sure how to get the oxidation numbers of all elements

Cloud [144]

<span>Fe(NO3)2
The NO3 part is a poly-atomic ion with total charge -1.
This is because Fe has a +2 charge and two NO3's with a -1 charge will balance out to 0.
Most often we just make the assumption that Oxygen has a -2 oxidation number because it is very electro-negative.
So to find N, we just need an oxidation number that balances out with 3(-2) to get -1 (the total charge of the ion)</span>

3 0

3 years ago

Why do you need a correct lewis structure before you can use vsepr to predict a molecules geometry.

JulsSmile [24]

Answer:

so the answer that you get isn't wrong? i dont know

4 0

2 years ago

The compounds shown below are written using the chemical symbols for the elements that they contain. The key shows the names of

Scrat [10]

Most of the compounds containing C and H are organic so A. CH4 is the correct option

8 0

3 years ago

How many amperes would be needed to produce 60.0 grams of magnesium during the electrolysis of molten mgcl 2 in 2.00 hours?

Shalnov [3]

Answer:

$\boxed{\text{66.2 A}}$

Explanation:

1. Write the equation for the reaction.

M_r: 24.30

MgCl₂ ⟶ Mg + Cl₂

m/g: 60.0

2. Calculate the moles of Mg

Moles of Mg = 60.0 g Mg × (1 mol Mg/ 24.30 g Mg) = 2.469 mol Mg

3. Calculate the moles of electrons

Moles of electrons = 2.469 mol Mg × (2 mol electrons/1 mol Mg)

= 4.938 mol electrons

4. Calculate the number of coulombs

Q = 4.938 mol electrons × (96 485 C/1 mol electrons) = 476 500 C

5. Calculate the current required

Q = It

I = Q/t

t = 2.00 h × (60 min/1h) × (60 s/1 min) = 7200 s

I = 476 500 C/7600 s= 66.2 C/s = 66.2 A

You need a current of $\boxed{\textbf{66.2 A}}$ .

8 0

3 years ago

How many molecules ?

dimaraw [331]

Answer:

42 millions of single cells

7 0

1 year ago