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3 years ago

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Chemistry

1 answer:

iren [92.7K]3 years ago

7 0

Answer:

Explanation:

Noble gases are in group 18 (neon, argon, etc)

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If 60.0 ml of a 1.5 m hcl solution is put into a flask and diluted with water to make 2.0 l of solution

77julia77 [94]

Answer:

The molarity of the diluted HCl solution: M₂ = 0.045 M

Explanation:

To find- the molarity of the diluted HCl solution (M₂)

Given- For original HCl solution-

Molarity: M₁ = 1.5 M, Volume: V₁ = 60.0 ml = 0.06 L (∵ 1L = 1000 mL)

Then this original solution is diluted to a volume of 2 L

Thus for the diluted HCl solution-

The Volume of the diluted HCl solution: V₂ = 2 L

So the Molarity of the diluted HCl solution (M₂) can be calculated by the dilution equation:

$M_{1}\times V_{1} = M_{2}\times V_{2}$

$\Rightarrow M_{2} = \frac{M_{1}\times V_{1}}{V_{2}}$

$\Rightarrow M_{2} = \frac{1.5 M\times 0.06 L}{2 L} = 0.045 M$

Therefore, the molarity of the diluted HCl solution: M₂ = 0.045 M

7 0

3 years ago

A ballon begins at sea level at 1 atm. It rises in the atmosphere to where the pressure is lower, to where the pressure is .75 a

maxonik [38]

Answer:

Original volume=3L

Explanation:

Assuming the gas in the ballon is ideal and the temperature does not vary with height we have the gas law as

PV=nRT

Here RHS is constant in both the conditions which means

PV=constant

Given P1=1 atm V1=V P2=0.75atm V2=4L

P1V1=P2V2

$1*V=0.75*4$

V=3L

The initial volume of the gas is 3L

4 0

3 years ago

A 34.87 g sample of a substance is initially at 27.1 C. after absorbing 1071 J of heat, the temperature of the substance is 145.

Alenkinab [10]

$H= \frac{1071}{34.87}*145\\H= \frac{155295}{34.87} \\H= \frac{15529500}{3487} \\H=4453.542$

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3 years ago

Suppose the filament in a super-powerful flashlight is heated up to 3600 K. What type of light would be given off by this filame

alexdok [17]

A cool white is the spectrum that lightbulbs between 3600-5000k would mainly show

4 0

3 years ago

Read 2 more answers

Chemical properties

ehidna [41]

The answer is C

Chemical properties or chemical changes are the ones which include changes that alter the identity of a substance. For example: burning of any substance which is also called combustion. You burn a piece of paper it changes its identity. It was cellulose fibres earlier now it’s ash after burning.
You burn petrol it was mixture of hydrocarbons but when burnt it changes to smoke which is just gases like carbon dioxide or nitrogen oxides. This is a chemical change

Changing of states is a physical change not chemical change. Think of meeting of ice the water molecules which were in solid state after melting become water molecules in the liquid state. Similarly, the evaporation or boiling will change the water molecules in the liquid state to the gaseous state also called its vapor state. These do not change identity it’s just the water molecules always may it be any state, solid, liquid or gaseous. So, boiling point and melting point are physical properties not chemical. The identity remains same during these processes.

Mass and color are not chemical properties. They don’t change identity when you measure them. If you weigh yourself on weight u won’t change into something else.

8 0

3 years ago