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2 years ago

Which of the following elements would you expect to be most reactive, based

Chemistry

1 answer:

ki77a [65]2 years ago

8 0

Answer:

C. Lithium

Explanation:

This image describes the trend in reactivity. Group 1 metals are always the most reactive so yeah :)

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How much potassium chlorate is needed to produce 20.0 mL<br> ofoxygen gas at 670 mm Hg and 293 K?

VLD [36.1K]

Answer:

0.058824 g

Explanation:

To calculate the moles of oxygen gas formed, we use the equation given by ideal gas which follows:

$PV=nRT$

where,

P = pressure of the gas = 670 mmHg

V = Volume of the gas = 20.0 mL = 0.02 L ( 1 mL= 0.001 L)

T = Temperature of the gas =293 K

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

n = number of moles of oxygen gas = ?

Putting values in above equation, we get:

$670mmHg\times 0.02L=n\times 62.3637\text{ L.mmHg }mol^{-1}K^{-1}\times 293K\\\\n=\frac{670\times 0.02}{62.3637\times 293}=0.00073mol$

According the reaction shown below:-

$2KClO_3\rightarrow 2KCl+3O_2$

3 moles of oxygen gas is produced when 2 moles of potassium chlorate reacts

So,

1 mole of oxygen gas is produced when $\frac{2}{3}$ moles of potassium chlorate reacts

Also,

0.00073 mole of oxygen gas is produced when $\frac{2}{3}\times 0.00073$ moles of potassium chlorate reacts

Moles of potassium chlorate reacts = 0.00048 Moles

Molar mass of potassium chlorate = 122.55 g/mol

Mass = Moles*Molar mass = $0.00048\times 122.55\ g$ = 0.058824 g

5 0

3 years ago

A chemist analyze an unknown liquid .the chemist takes samples from the top ,middle and bottom of the samples .what observations

Annette [7]

Explanation:

The observation that can make the chemist conclude that the liquid is a pure substance is if the unknown liquid composition is the same at every point of sampling.

Pure substances are distinct substances.
They have a definite composition.
All the parts are the same throughout.
They cannot easily be separated or broken down into simpler substances by physical means.
They have a unique set of physical properties.

Therefore, if his analysis meets any of the criteria for defining a pure substance above, he can conclude that it is one.

Pure substances are elements and compounds.

Learn more:

Pure substances brainly.com/question/1832352

#learnwithBrainly

5 0

2 years ago

A certain ore is 29.9% nickel by mass. How many kilograms of this ore would you need to dig up to have 75.0 g of nickel?

vichka [17]

75g ---- 29,9%
Xg ----- 100%
X = 7500/29,9
X = 250,836g :)

7 0

2 years ago

Which prefix would appear in the IUPAC name for a covalent compound that has four atoms of a single element?

GenaCL600 [577]

The correct prefix is ‘tetra’. You can remember this because in Tetris (the game) you always get a block that consists out of 4 small squares arranged differently.

4 0

2 years ago

In your double replacement reaction, the more reactive metal "pushed" the other one out of its place. Without using the Internet

irakobra [83]

You are using the internet right now. The question told you not to. Lol

5 0

2 years ago