CHEMISTRY HIGH SCHOOL

Which one of the following groups of chemical compounds is composed entirely of organic compounds?A. C2H4O, CH2O, CaSO4
, C3H5
(OH)3
B. C2H2
, CH4
, CaCl2
, CaCN2
C. Ch3OCH3
, Ca3
(PO4
)2
, CO2
, H2CO3
D. C6H6
, C2H5OH, C6H5CH3
, C3H5
(NO3
)3

Answers

Answer 1
Answer:

Answer;

D. C6H6, C2H5OH, C6H5CH3, and C3H5(NO3)3.

Explanation;

-Organic compound are chemical compounds in which one or more atoms of carbon are covalently linked to atoms of other elements, most commonly hydrogen, oxygen, or nitrogen, like the examples above in choice D. . Inorganic Compoundson the other hand, are compounds made from any elements except those compounds of carbon, such as CaSO4, CaCl2 and Ca3(PO4)2 in A, B and C respectively.
Answer 2
Answer: The correct answer is D.

In group A, CaSO4 is not organic; in group B, CaCl2 is not organic; in group C, Ca3(PO4)2 is not organic.

Hope this helps~

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A 65.0-gram sample of some unknown metal at 100.0° C is added to 100.8 grams of water at 22.0° C. The temperature of the water rises to 27.0° C. If the specific heat capacity of liquid water is 4.18 J/ (°C × g), what is the specific heat of the metal?

A car on a 25-m2 hydraulic lift platform weighs 15,000 N. If the force on the smaller piston required to lift it is 1/100 its weight, what is the area of the smaller piston?

Answers

Answer:

The area is  2.5 m²

Explanation:

Step 1: Data given

A car has a 25 m² hydraulic lift platform that weighs 15000 N

The smaller piston required a force to lift = 1/100 its weight

Step 2: Calculate the area of the smaller piston

Pressure = Force / Area

F1 / A1 = F2 / A2

⇒ with F1 = weight of the hydraulic lift =  15000 N

⇒ with A1 = area of the hydraulic lift = 25 m²

⇒ with F2 = 1/100 of it's weight = 1500 N

A2 = F2 / (F1/A1)

A2 = 1500 ( 1500/25)

A2 = 2.5

The area is  2.5 m²

definition of a solvent , solution , solute !!!!!!!!!! ;)

Answers

A solution is a mixture (solvent + solute) of 2 or more elements, for example chocolate milk.

A solvent is the base of the solution which dissovles a solute, for example milk.

A solute is what is dossolved by the solvent, for example chocolate powder.
Solvent - the liquid in which a solute is dissolved to form a solution

Solution - a liquid mixture in which the minor component (the solute) is uniformly distributed within the major component (the solvent)

Solute - the dissolved substance in a solution

Rita divides Avogadro’s number (approximately 6.022 mc002-1.jpg 1023) by 2.0550 to calculate the number of atoms in a sample. Which expression gives her result to the correct number of significant figures?

Answers

Here you have two numbers. Avogadro's number is given with four significant figures, while number 2.0550 is given with five significant figures. That means that your result must be shown with four significant figures. So, 6.022 * 10 ^ 23 / 2.0550 = 2.930 * 10 ^ 23, which has been rounded to four significant figures. Answer: 2.930 * 10 ^ 23

Answer:

Answer is B

Explanation: Trust

How could you test the law of conservation of matter? ( No atoms can be created or destroyed when under physical or chemical change)

Answers

Answer:

By measuring the total mass of the matter before as well as after any physical or chemical change.

Explanation:

As mentioned, according to the law of conservation of matter, no atoms can be created or destroyed when under physical or chemical change.

Naturally, all the matters have some mass associated with it.

To verify the law of conservation of matter, at first, measure the mass of matter before it underwent any physical or chemical change. Then, again, measure the mass of the matter after the physical or chemical change.

Now, observe both the mass, both must be equal. This verifies the law of conservation of matter.

Solid aluminum and gaseous oxygen react in a combination reaction to produce aluminum oxide: In a particular experiment, the reaction of 2.5 g of Al with 2.5 g of O2 produced 3.5 g of Al2O3. The % yield of the reaction is __________.

Answers

Answer:

The % yield of the reaction is 73.8 %

Explanation:

To solve this, we list out the given variables thus

Mass of aluminium in the experiment = 2.5 g

mass of oxygen gas in the experiment = 2.5 g

Molar mass of aluminium = 26.98 g/mol

molar mass of oxygen O₂ = 32 g/mol

The reaction between aluminium and gaseous oxygen can be written as follows

4Al + 3O₂ → 2Al₂O₃

Thus four moles of aluminium forms two moles of aluminium oxide

Thus (2.5 g)÷(26.98 g/mol) = 0.093 mole of aluminium and

(2.5 g)÷(32 g/mol)  = 0.078125  moles of oxygen

However four moles of aluminium react with three moles of oxygen gas O₂

1  mole of aluminum will react with 3/4 moles of oxygen O₂ and 0.093 mole of aluminium will react with 0.093*3/4 moles of O₂ = 0.0695 moles of Oxygen hence aluminium is the limiting reagent and we have

1 mole of oxygen will react with 4/3 mole of aluminium

∴ 0.078125 mole of oxygen will react with 0.104 moles of aluminium

Therefore 0.093 mole of aluminium will react with O₂ to produce 2/4×0.093 or 0.0465 moles of  2Al₂O₃

The molar mass of 2Al₂O₃ = 101.96 g/mol

Hence the mass of 0.0465 moles = number of moles × (molar mass)

= 0.0465 moles × 101.96 g/mol = 4.74 g

The  of aluminium oxide Al₂O₃ is 4.74 g, but the actual yield = 3.5 g

Therefore the Percentage yield = (actual yield )/(theoretical yield) ×100 = (3.5)/(4.74) × 100 = 73.8 % yield

How might we one day be able to prove the absence of God through science?

Answers

You will never, I believe that the Almighty wouldn't allow this to happen. This is just my belief though. You will have to go to your parents of read up on it your self to really be able to see if there is a way. Ask yourself the question, How am I breathing? Next, ask yourself Were is air provided from? Who provides the air you breath. You really just have to check and look into it your spirit and ask yourself Do I believe in there being a absence of God(which ever god you serve)? If you reply no than science no matter how hard they try will not be able to disprove God.

by the eveloution of the big bang theory
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