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makvit [3.9K]
3 years ago
6

Which of the following statements is true about what happens in all chemical reactions? A. The ways in which atoms are joined to

gether is not changed. B. Bonds between atoms are broken and new bonds are formed. C. The final substances are called reactants.
Chemistry
1 answer:
antoniya [11.8K]3 years ago
4 0

Answer:

B.bonds are broken and new bonds are formed

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State three evidences that the particles of substances are in continuous motion
Solnce55 [7]

The three evidences that show that the particles of substances are in continuous motion are given below:

1. DIFFUSION: Diffusion is the movement of particles of a substance through a medium, from a region of higher concentration to a region of lower concentration. Particles of substances (solid, liquid or gas) tend to move from an area where more of them are present to an area where only few are present until they are evenly distributed. For example, a can of gasoline left in an open air can easily catch fire because the particles of gasoline can be easily carried by air to the nearest source of ignition.

2. OSMOSIS: Osmosis is the process by which solvent molecules move from a less concentrated solution to a more concentrated solution through a semi permeable membrane; the movement typically continues until the concentrations of solutes on both sides of the membrane are equal. Osmosis is a very crucial process in the biological systems of living organisms, where the plasma membrane, which is semi permeable in nature only allow specific small particles to pass through. Water molecules pass through the plasma membrane by diffusion via the phospholipid bilayers; osmosis thus provide the major mean via which water is moved in and out of living cells

3. BROWNIAN MOVEMENT: When a pollen grain, which is suspended in a drop of water is observed under a microscope, it will be seen that the pollen is moving about in a zig-zag manner. The zig zag movement of the pollen is due to the continuous movement of the particles of water on which the pollen was suspended. This phenomenon was first observed by a botanist, a British scientist called Robert Brown in 1827 and that was why the phenomenon was named after him.

3 0
3 years ago
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Calculate the molarity of each solution.
weeeeeb [17]
Q1)
molarity is defined as the number of moles of solute in 1 L solution 
the number of moles of LiNO₃ - 0.38 mol
volume of solution - 6.14 L
since molarity is number of moles in 1 L 
number of moles in 6.14 L - 0.38 mol
therefore number of moles in 1 L - 0.38 mol / 6.14 L = 0.0619 mol/L
molarity of solution is 0.0619 M

Q2)
the mass of C₂H₆O in the solution is 72.8 g
molar mass of C₂H₆O is 46 g/mol 
number of moles = mass present / molar mass of compound
the number of moles of C₂H₆O - 72.8 g / 46 g/mol 
number of C₂H₆O moles - 1.58 mol
volume of solution - 2.34 L
number of moles in 2.34 L - 1.58 mol
therefore number of moles in 1 L - 1.58 mol / 2.34 L = 0.675 M
molarity of C₂H₆O is 0.675 M

Q3)

Mass of KI in solution - 12.87 x 10⁻³ g
molar mass - 166 g/mol
number of mole of KI = mass present / molar mass of KI
number of KI moles = 12.87 x 10⁻³ g / 166 g/mol = 0.0775 x 10⁻³ mol
volume of solution - 112.4 mL 
number of moles of KI in 112.4 mL - 0.0775 x 10⁻³ mol
therefore number of moles in 1000 mL- 0.0775 x 10⁻³ mol / 112.4 mL x 1000 mL
molarity of KI - 6.90 x 10⁻⁴ M
8 0
3 years ago
The loss of mass in nuclear fusion is 0.02 g per mole of fuel. The molecular weight of the fuel is 5 g/mole. The amount of energ
BaLLatris [955]

Answer:

The amount of energy produced by consuming 1 kg of fuel in nuclear fusion is 1.0008\times 10^8 kWh kWh.

Explanation:

Mass of fuel = 1 kg = 1000 g

Moles of fuel = \frac{1000 g}{5 g/mol}=200 mole

The loss of mass in nuclear fusion is 0.02 g per mole of fuel

Loss of mass in nuclear fusion by consuming 200 mole : m

m=0.02 g/mol\times 200 mol = 4 g=4\times 0.001 kg

1 g = 0.001 kg

Energy produced during this process can be determined by mass energy equation :

E=mc^2

E=4\times 0.001 kg\times (3\times 10^8 m/s)^2=3.6\times 10^{14} J

1 J = 2.78\times 10^{-7} kWh

E=3.6\times 10^{14}\times 2.78\times 10^{-7} kWh=1.0008\times 10^8 kWh

The amount of energy produced by consuming 1 kg of fuel in nuclear fusion is 1.0008\times 10^8 kWh kWh.

6 0
3 years ago
What is the naming process of alkanes, alkenes, and alkynes
Tanzania [10]

Answer: Heyo Kenji Here! Here's your answer- Higher alkenes and alkynes are named by counting the number of carbons in the longest continuous chain that includes the double or triple bond and appending an -ene (alkene) or -yne (alkyne) suffix to the stem name of the unbranched alkane having that number of carbons.

Explanation: Hope this helps!

Have a nice day!

- Kenji ^^

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2 years ago
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What happens to the chemical structure of water when it changes states
Anettt [7]

Answer:

When water changes to a solid or gas, it's said that water changes to a different state of matter

Explanation:

Even when water physical form changes, the molecules stay the same. Water's molecules contains two hydrogen atoms that is bonded with one oxygen atom.

8 0
3 years ago
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