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3 years ago

What concept in Dalton’s atomic theory has been modified?

Chemistry

2 answers:

amm18123 years ago

6 0

Answer: (D) Atoms cannot be divided

Explanation: It wasn't until around 2,000 years later, in the early 1800s, when John Dalton came along and disproved Aristotle. Dalton went on to say that matter is made up of tiny particles, called atoms, that cannot be divided into smaller pieces and cannot be destroyed.

hichkok12 [17]3 years ago

4 0

D. Atoms cannot be divided

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4) In a chemical change a _____________ substance forms.

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A complex substance forms when a chemical change takes place

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3. The molar volume of a gas at STP occupies 0 1 kilopascal O ooc 12 grams 22.4 L

Reil [10]

The molar volume of a gas at STP occupies 22.4 L.

Option D

Explanation:

To find the volume of 1 mole of a gas at STP, we use the Ideal Gas Law. It is the general gas equation which gives the relation to the measurable quantities to an ideal gas as below,

P (pressure) × V (volume) = n (number of moles) × R (the gas constant) × T (temperature in Kelvin)

STP = 1 atm of pressure and 273 K for temperature

P = 1 atm

V = ?

n = 1 mole

R = 0.0821 atm L/mol K

T = 273 K

Using the equation,

$\mathrm{PV}=\mathrm{nRT}$

$V=\frac{n R T}{P}$

By substituting the above values, in the equation,

$V=\frac{1 \times 0.082 \times 273}{1}=22.38\ L$

V = 22.38 L

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3 years ago

A mixture is -

garik1379 [7]

a. a chemical combination of two or more different materials.

For example: For example, air is a mixture of gases, containing N, O, Ar, CO2

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3 years ago

Is damp wood and ignition source?

sdas [7]

Answer: An ignition source is a process or event which can cause a fire or explosion. Open flames, sparks, static electricity, and hot surfaces are all possible ignition sources. An explosion can occur when flammable gases or vapors in the air come in contact with an ignition source such as a spark.

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4 years ago

If my measurement is 2.34 cm and the ACTUAL value is 2.35 cm, is my measurement accurate?

valkas [14]

Sadly, yours isn’t accurate

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