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3 years ago

Fill in the blank to complete each statement about measuring an earthquake's magnitude.

Chemistry

2 answers:

ahrayia [7]3 years ago

6 0

Richter & Moment

I just did it :)

Vilka [71]3 years ago

3 0

Answer: Richter & Moment

Explanation: already did it

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Which of the following are examples of chemical changes? Select all that apply.

Travka [436]

A B and C are all chemical changes. paper tearing is not.

6 0

3 years ago

Are air masses and fronts the same thing?

Lorico [155]

The correct awnser is yes, hope this helps

3 0

3 years ago

If one gram of sulphur dioxide contains x molecules what will be the number of molecules in 1g of methane

evablogger [386]

The ratio of molecules in sulphur dioxide and methane will be the same as the ratio of their moles. So, first of all we should find out the number of moles of sulphur dioxide in 1 gram of sulphur dioxide in 1 gram of sulphur dioxide, and the number of moles of methane in 1 gram of methane. This can be done as follows :

(i) The molecular formula of sulphur dioxide is $SO_{2}$

So, $1$ mole of $SO_{2}$ = $Mass$ $of$ $2'O'$

$=32+2*16$

$= 64$ grams

Now, $64g$ of sulphur dioxide $= 1$ mole

So, $1g$ of sulphur dioxide = $\frac{1}{64}$ mole

Thus, we have $\frac{1}{64}$ mole of sulphur dioxide and it contains molecules in it. Now, since equal moles of all the substance contain equal number of molecules, therefore, $\frac{1}{64}$ mole of methane will also contain x molecules of methane.

(ii) Molecular formula of methan is $CH_{4}$

So, 1 mole of $CH_{4}$ = Mass of C + Mass of 4 H

$=12+4*12$

Now, 16g of methane = 1 mole

So, 1 g of mathane = $\frac{1}{16}$ mole

We know that:

$\frac{1}{64}$ mole of methane contains = x molecules

So, $\frac{1}{16}$ mole of contains will contain = $\frac{x*64}{16}$ molecules

= $4x$ molecules

7 0

2 years ago

Ethyl acetate can be prepared by an SN2 reaction. Draw the alkylbromide and nucleophile used in the reaction. Remember to includ

bulgar [2K]

Answer:

Few important points related to $S_N2$ reaction:

1. $S_N2$ is a one-step reaction that follows second order kinetics.

2. In $S_N2$ reaction, a transition state is formed in situ.

3. Strong nucleophiles like $OH^- \ or\ CN^-$ are used in case of bi-molecular nucleophilic substitution reaction.

Ethyl acetate can be prepared by a second-order nucleophilic substitution reaction between acetic acid and ethyl bromide.

The reaction between acetic acid and ethyl bromide is drawn below:

8 0

3 years ago

Read 2 more answers

with an excess of oxygen gas according to the following chemical equation. 4 P 502 > 2 P2Os What mass of P2O5 can be produced

MArishka [77]

Answer:

394.76g

Explanation:

Given parameters:

Mass of Phosphorus = 172.1g

Unknown:

Mass of P₂O₅ = ?

Solution:

We should work from the known specie to the unknown in this problem. The limiting reactant is the reactant in short supply and it determines the extent of the reaction. This is the given phosphorus.

Oxygen is in the excess.

The balanced reaction equation:

4P + 5O₂ → 2P₂O₅

let us find the number of moles of phosphorus first,

Number of moles of phosphorus = $\frac{mass}{molar mass}$

Molar mass of phosphorus = 31g/mole

Number of moles = $\frac{172.1}{31}$ = 5.55mole

4 moles of phosphorus gives 2 moles of P₂O₅

5.55 mole of P will produce $\frac{5.55 x 2}{4}$ = 2.78moles

Mass of P₂O₅ = number of moles x molar mass

Molar mass of P₂O₅ = (31 x 2) + (16 x 5) = 142g/mole

Mass of P₂O₅ = 2.78moles x 142g/mole = 394.76g

4 0

3 years ago