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2 years ago

A camper burned a piece of paper to start a campfire. is burning paper a physical or chemical change? why?

1 answer:

4 0

A camper burning a piece of paper to start a campfire is a chemical change - the way you can think of this is to consider the fact that the paper cannot be put back together and has become ash, so this is therefore a chemical change. The carbon in the paper is oxidized into other chemical including carbon dioxide. Mass was conserved during this reaction because the mass is still the same, just in a different form.

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A closed container holds 2.0 moles of CO2 gas at STP. How many moles of oxygen can be placed in a container of the same size at

PilotLPTM [1.2K]

Answer: 2 moles

Explanation:

STP is Standard Temperature and Pressure. That means the pressure is 1.00 atm and the temperature is 273K. Since the oxygen is placed in the same container, we can use Ideal Gas Law to figure out what container the CO₂ used.

Ideal Gas Law: PV=nRT

P=1.00 atm

n=moles

R=0.08206 Latm/Kmol

T=273K

CO₂

$V=\frac{nRT}{P}$

$V=\frac{(2.0 mol)(0.08206Latm/Kmol)(273K)}{1.00atm}$

$V=44.8L$

Since we know that CO₂ has a 44.8 L container, we can use that to find the moles of oxygen.

$n=\frac{PV}{RT}$

$n=\frac{(1.00atm)(44.8L)}{(0.08206Latm/Kmol)(273K)}$

$n=1.99=2mol$

There are 2 mol of oxygen.

5 0

2 years ago

Which pair of elements is in the same period? (Check ALL that apply) *

stira [4]

Answer:

D and R are in the same period

Explanation:

remember groups are vertical and periods are horizontal!

3 0

2 years ago

How do you figure out how many isotopes an element has?

Helen [10]

by counting the isoto

7 0

2 years ago

The answer is: variable

sergeinik [125]

Answer:

variable: not consistent or having a fixed pattern; liable to change.

Explanation:

6 0

2 years ago

Name of molecule formed upon oxidation of aldehyde to carbonyl group

storchak [24]

Aldehyde is a group of organic compounds with the general form of RCHO. Oxidation of aldehyde can lead to the formation of the carboxylic acids, with the general form of RCO₂H.

With this oxidation, the typical reagents promoting the oxidation are chromic acids, chromate salts, permanganate, etc.

6 0

2 years ago