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3 years ago

The table shows four reactions.

Chemistry

2 answers:

Svetlanka [38]3 years ago

7 0

The correct answer is 2

stepan [7]3 years ago

6 0

Answer: 2

Explanation:

Organic compounds are those compounds that contain carbon bonded to hydrogen.

Inorganic compounds are those compounds that do not contain carbon or contain carbon not bonded to hydrogen.

1. $C_3H_8+5O_2\rightarrow 3CO_2+4H_2O$ dfhdhfdfh

Combustion is a chemical reaction in which organic compound is reacted with oxygen to form carbon dioxide and water.

2. $2Ca+O_2\rightarrow 2CaO$

This is combustion of inorganic compound in which it is reacted with oxygen and is called as synthesis reaction.

3. $AgNO_3+NaCl\rightarrow AgCl+NaNO_3$

Double displacement is a chemical reaction in which exchange of ions take place.

4. $CH_3COOH+2O_2\rightarrow 2CO_2+4H_2O$

Combustion is a chemical reaction in which organic substance is reacted with oxygen to form carbon dioxide and water.

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THIS IS A THREE PART QUESTION IF YOU CAN HELP IT WOULD BE REALLY APPRECIATED SO I DONT FAIL.

Nostrana [21]

Answer:

1. B = 1.13M

2. A. 8.46%

3. D = 0.0199

Explanation:

1. Molarity of a a solution = number of moles of solute/ volume of solution in L

Number of moles of solute = mass of solute/molar mass of solute

Molar mass of NaC₂H₃O₂ = 82 g/mol, mass of NaC₂H₃O₂ = 245 g

Number of moles of NaC₂H₃O₂ = 245 g / 82 g/mol = 2.988 moles

Molarity of solution = 2.988 mols/ 2.65 L = 1.13 M

2. Percentage by mass of a substance = mass of substance /mass of solution × 100%

Mass of 2.65 L of water = density × volume

Density of water = 1 Kg/L = 1000 g/L; volume of waterb= 2.65 L

Mass of water = 1000 g/L × 2.65 L = 2650 g

Mass of solution = mass of water + mass of solute = 245 + 2650 =2895 g

Percentage by mass of NaC₂H₃O₂ = 245/2895 × 100% = 8.46%

3. Mole fraction of NaC₂H₃O₂ = moles of NaC₂H₃O₂/moles of solution

Moles of water = mass /molar mass

Mass of water = 2650 g; molar mass of water = 18 g/mol

Moles of water = 2650 g / 18 g/mol = 147.222 moles

Moles of solution = moles of solute + moles of water = 147.222 + 2.988 = 150.21

Moles of NaC₂H₃O₂ =2.988 moles

Moles fraction of NaC₂H₃O₂ =2.988/150.21 = 0.0199

6 0

3 years ago

An experiment is carried out to observe the melting ice. Heat energy is supplied at a constant rate. The temperature of the ice

zhenek [66]

Answer:

If the ambient temperature around a piece of ice increases, the temperature of the ice will increase as well. However, this steady increase in temperature stops as soon as the ice reaches its melting point. At this point, the ice undergoes a change of state and turns into liquid water, and its temperature won't change until all of it has melted. You can test this with a simple experiment. Leave a cup of ice cubes in a hot car and monitor the temperature with a thermometer. You'll find that the icy water remains at a frosty 32 degrees Fahrenheit (0 degrees Celsius) until all of it has melted. When that happens, you'll notice a quick temperature rise as the water continues to absorb heat from the inside of the car.

7 0

3 years ago

Can someone help me please ? Click the picture

bixtya [17]

Answer:

Because it lose detectable mass.

Explanation:

Law of conservation of mass states that substances involved in chemical reaction do not lose or gain any mass. So the above reactions don't demonstrate the law of conservation of mass because it lose mass

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3 years ago

jamie is not sure a new medication will work because it has not had a large test group. Is jamie being creative?

Georgia [21]

Answer:

yes because I wouldn't do it

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3 years ago

How does the doppler effect provide evidence for the Big Bang theory<br> PLZ HURRY AND HELP

forsale [732]

Answer: Doppler Red-Shift Evidence

The Doppler red-shift of light observed from distant stars and galaxies gives evidence that the universe is expanding (moving away from a central point). This allows for Big Bang Theory, because after a “bang” occurs all of the matter moves away from the point of origin.

PLZZ GIVE ME BRAINLIEST

6 0

3 years ago

Read 2 more answers