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2 years ago

2. Give an example of a chemical or physical process that illustrates the law of

2 answers:

5 0

The carbon atom in coal becomes carbon dioxide when it is burned. the carbon atom changes from a solid structure to a gas but it’s mass doesn’t change.

Sever21 [200]2 years ago

5 0

Answer:

when wood burns

(PLS MARK BRAINLIEST) (hope it helps!)

Explanation: when wood burns, the mass of the soot, ashes, and gases equals the original mass of the charcoal and the oxygen when it first reacted. So the mass of the product equals the mass of the reactant

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Find the formula of the ionic compound made from aluminum (Al) and oxygen (O).

FrozenT [24]

The formula will be AI2O3

4 0

4 years ago

roundup, an herbicide manufactured by monsanto, has the formula C3H8NO5P. How many moles of molecules are there in a 304.3 g sam

Blizzard [7]

First you find the molar mass of the formula.

3C: 36.03g + 8H:8.08g + N: 14.01g + 5O: 80g + P: 30.97g = 169.09g

Then do the mole ratio (304.3g)x(1mole/169.09g) = 1.800 moles

3 0

3 years ago

Arrange the bromine-containing compounds CaBr2, Br2, NBr3, CBr4 in order of increasing predicted boiling point.

Fudgin [204]

Explanation:

In an ionic compound, there will be strong force of attraction between the combining atoms due to the opposite charges present on them.

For example, $CaBr_{2}$ is an ionic compound where calcium has a +2 charge and each bromine atom has a -1 charge.

Therefore, in order to break the bond we need to provide more heat. Hence, boiling point of calcium bromide will be the highest.

$NBr_{3}$ is a covalent compound and as nitrogen is more electronegative in nature and also has a lone pair of electron hence, there will be a net dipole moment.

$CBr_{4}$ is also a covalent compound. And, as bromine is more electronegative than carbon atom so, dipole moment is in the outwards direction. Hence, in $CBr_{4}$ there will be zero dipole moment.

Therefore, its boiling is less than the boiling point of $NBr_{3}$ .

$Br_{2}$ is a covalent compound and there will be no dipole moment.

Thus, we can conclude that given bromine-containing compounds are placed in their increasing boiling point order as follows.

$Br_{2}$ < $CBr_{4}$ < $NBr_{3}$ < $CaBr_{2}$

3 0

4 years ago

What are the properties of cathode rays?

wariber [46]

They travel linearly.
They have a negative electric charge.
They have particle property.
Magnets can deflect them.
Charge/mass ratio of the rays is constant.
They travel from the cathode to the anode.
Their properties are independent from the electrodes and gas present in the cathode ray tube.

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3 years ago

Nuclear energy is associated with

maria [59]

Protons and neutrons

6 0

3 years ago

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