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Leno4ka [110]
4 years ago
14

What did Dalton's atomic theory contribute to science?

Chemistry
1 answer:
Serga [27]4 years ago
4 0

Answer:

B

Explanation:

Pasted below is his 5 theory's and all of them are the building blocks of chemistry today.  

1. Matter is made up of atoms that are indivisible and indestructible.

2. All atoms of an element are identical.

3. Atoms of different elements have different weights and different chemical properties.

4. Atoms of different elements combine in simple whole numbers to form compounds.

5. Atoms cannot be created or destroyed. When a compound decomposes, the atoms are recovered unchanged.

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How does helium form (5-8) sentences
Firlakuza [10]
On Earth it is relatively rare—5.2 ppm by volume in the atmosphere. Most terrestrial helium<span> present today is created by the natural radioactive decay of heavy radioactive elements (thorium and uranium, although there are other examples), as the alpha particles emitted by such decays consist of </span>helium<span>-4 nuclei.</span>
7 0
3 years ago
Chemical A and Chemical B react in an exothermic reaction. What can be known about what will happen when Chemical A and Chemical
Fynjy0 [20]
In exothermic reactions, there is a release heat and the replacement of weak bonds with stronger ones.
8 0
3 years ago
Why did mendeleev improve newlands periodic table
Charra [1.4K]

Answer: Mendeleev improve newlands periodic table because he  swapped the order of some elements if that fitted their properties better.

Explanation: I hope this helps!... :)

8 0
3 years ago
Which of the following compounds is an unsaturated hydrocarbon?
Jobisdone [24]

Answer:

Explanation:

Saturated hydrocarbons are defined as the hydrocarbons in which a single bond is present between carbon and carbon atoms.These are called as alkanes. The general formula for these hydrocarbons is C_nH_{2n+2}

Unsaturated hydrocarbons are defined as the hydrocarbons which have double or triple covalent C-C bonds. They are known as alkenes and alkynes respectively. The general formula for these hydrocarbons is C_nH_{2n} and C_nH_{2n-2}.

1. Propyne is C_3H_4 and is an unsaturated hydrocarbon.

2. Methane is CH_4 and is a saturated hydrocarbon

3. Nonane is C_9H_{20} is a saturated hydrocarbon.

4. Methyl is CH_3 and is a saturated alkyl group.

3 0
4 years ago
Using your knowledge of reactions and mechanisms, draw the mechanism for the formation of 2-methylpropene from 2-methyl-2-propan
BARSIC [14]

Answer:

Here's what I get  

Explanation:

The reaction is an E1 elimination of an alcohol to form an alkene. It has three steps:

1. Protonation

The alcohol is protonated with aqueous sulfuric acid to convert it into a better leaving group.

2. Loss of the leaving group

A water molecule leaves in a unimolecular process to form a stable 3° carbocation.

3. Loss of an α-hydrogen

A water molecule removes an α-hydrogen, forming 2-methylpropene and regenerating the original hydronium ion.

4 0
3 years ago
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