CHEMISTRY MIDDLE SCHOOL

Which compound is classified as a hydrocarbon?(1) butanal (3) 2-butanol
(2) butyne (4) 2-butanone

Answers

Answer 1
Answer:

Answer: The correct answer is Option 2.

Explanation:

Hydrocarbons are defined as the compounds which have a covalent bond present between hydrogen and carbon atoms. For Example: CH_4 is a hydrocarbon. H_2O,CO_2 are not considered as hydrocarbons.

For the given options:

Option 1: butanal

The chemical formula for this compound is CH_3CH_2CH_2CHO

This is not considered as a hydrocarbon because a covalent bond is present between carbon and oxygen atom.

Option 2: butyne

The chemical formula for this compound is CH\equiv CCH_2CH_3

This is considered as a hydrocarbon because covalent bonds are present between carbon and hydrogen atoms only.

Option 3: 2-butanol

The chemical formula for this compound is CH_3CH(OH)-CH_2CH_3

This is not considered as a hydrocarbon because a covalent bond is present between carbon and oxygen atom.

Option 4: 2-butanone

The chemical formula for this compound is CH_3C(O)-CH_2CH_3

This is not considered as a hydrocarbon because a covalent bond is present between carbon and oxygen atom.

From the above information, the correct answer is Option 2.
Answer 2
Answer: (2) butynu........................

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which industrial city would have fewer air pollution incidents related to temperature inversions one on the great plains or one near the rocky mountains

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I'm not positive, but I believe it would be one near the Rocky Mountains.

What is called to pass into a solution; to reduce to liquid form

Answers

I think the process is dissolving

Which requires the removal of heat, melting or freezing?Is it evaporation? What is it? Why?

Answers

Freezing. If you take away energy from something, (lower its temperature), it will freeze. If you add heat to something, it will melt if it is a solid and evaporate if it is a liquid.

When you add energy to something, the atoms which comprise the substance jiggle and vibrate, meaning that on a large scale, a solid will become a liquid, and a liquid will become a gas.
Freezing, just think about it, the colder it gets the more likely there is going to be snow/ hail/ ice

How did atomic theory develop and change?

Answers

The atomic theory develop and change as the from the Bohr's model is that how electrons occupy the space using the scientific method from the philosophy.

The John Dalton develop the Proust's work and then change the atomic philosophy of the into the scientific theory. Scientists did not believe that the electrons move in the regions not in the orbits and then they uses the mathematics and quantum numbers for the explanation.

The Bohr's model is to describe the chemical properties of an atom. The experiments demonstrated that atoms of the same element contains the different masses as the number of the neutrons can vary and called as the isotopes of the same element.

To learn more about atomic theory here

brainly.com/question/28853813

#SPJ3
The atomic theory started with Democritus, who stated that all space was made up of indivisible particles called atoms, though Aristotles refuted that statement by saying that matter didn’t exist, he believed in the four elements: air, fire, water, and earth. Then came Dalton, who revived Democritus’s ideas and proposed the law of multiple proportions, he revived the idea that all space was made of atoms. Soon after, J.J Thompson discovered the electron by using cathode rays. Max Planck developed the quantum theory by stating that electromagnetic radiation could only be emitted in quantized form (later called quanta). Einstein furthered this idea with studies of light. Robert Millikan eventually measured the charge of a single electron. Ernest Rutherford used a gold foil experiment and discovered the nuclei, considering his alpha particles were deflected by some object. Niels Bohr made the atomic model with electrons spinning around an atom’s nucleus, Erwin Schrodinger describes how electrons have wave like properties. James Chadwick then discovers the neutron!

There ya have it!

Crash Course History of Science Episode #22:Darwin and Natural Selection
1. In Natural Theology what were the 4 aspects of creation?

Answers

1) There’s a divine creator.
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In a single displacement reaction between sodium phosphate and barium, how much of each product (in grams) will be formed from 10.0 grams of barium?

Answers

Answer:

A. 3.36g of Na.

B. 14.62g of Ba3(PO4)2.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

3Ba + 2Na3PO4 → 6Na + Ba3(PO4)2

Next, we shall determine the mass of Ba that reacted and the mass of Na and Ba3(PO4)2 produced from the equation.

This is illustrated below:

Molar Mass of Ba = 137g/mol

Mass of Ba from the balanced equation = 3 x 137 = 411g

Molar mass of Na = 23g/mol

Mass of Na from the balanced equation = 6 x 23 = 138g

Molar mass of Ba3(PO4)2 = (3 x 137) + 2[31 + (4x16)] = 411 + 2[31 + 64] = 601g/mol

Mass of Ba3(PO4)2 from the balanced equation = 1 x 601 = 601g

Summary:

From the balanced equation above,

411g of Ba reacted to produce 138g of Na and 601g of Ba3(PO4)2.

A. Determination of the mass of Na produced by reacting 10g of Ba.

From the balanced equation above,

411g of Ba reacted to produce 138g of Na.

Therefore, 10g of Ba will react to produce = (10 x 138)/411 = 3.36g of Na.

Therefore, 3.36g of Na is produced.

B. Determination of the mass of Ba3(PO4)2 produced by reacting 10g of Ba.

From the balanced equation above,

411g of Ba reacted to produce 601g of Ba3(PO4)2.

Therefore, 10g of Ba will react to produce = (10 x 601)/411 = 14.62g of Ba3(PO4)2.

Therefore, 14.62g of Ba3(PO4)2 is produced.
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