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3 years ago

12

A scientist adds 46.3 J of heat to a 13.4g sample of an unknown substance. the temperature increases by 1.40 celsius. What is th

e unknown substance?

1 answer:

Lelu [443]3 years ago

8 0

Answer:

number b Aluminium

Explanation:

aluminium is the answer

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How many moles of oxygen must be placed

umka21 [38]

Answer: 0.245 moles of oxygen must be placed in the container to exert the given pressure at the given temperature. The Ideal Gas Law equation gives the relationship among the pressure, volume, temperature, and moles of gas.

Further Explanation:

The Ideal Gas Equation is:

$PV = nRT$

where:

P - pressure (in atm)

V - volume (in L)

n - amount of gas (in moles)

R - universal gas constant $0.08206 \frac{L-atm}{mol-K}$

T - temperature (in K)

In the problem, we are given the values:

P = 2.00 atm (3 significant figures)

V = 3.00 L (3 significant figures)

n = ?

T = 25.0 degrees Celsius (3 significant figures)

We need to convert the temperature to Kelvin before we can use the Ideal Gas Equation. The formula to convert from degree Celsius to Kelvin is:

$Temperature \ in \ Kelvin = Temperature\ in \ Celsius \ + \ 273.15$

Therefore, for this problem,

$Temperature\ in \ K = 25.0 +273.15\\Temperature\ in \ K = 298.15$

Solving for n using the Ideal Gas Equation:

$n \ = \frac{PV}{RT}\\n \ = \frac{(2.00 \ atm) \ (3.00 \ L)}{(0.08206 \ \frac{L-atm}{mol-K})( 298.15 \ K)} \\n \ = 0.245 \ mol$

The least number of significant figures is 3, therefore, the final answer must have only 3 significant figures.

Learn More

1. Learn more about Boyle's Law brainly.com/question/1437490

2. Learn more about Charles' Law brainly.com/question/1421697

3. Learn more about Gay-Lussac's Law brainly.com/question/6534668

Keywords: Ideal Gas Law, Volume, Pressure

4 0

3 years ago

Single-celled organisms need a microscope to be seen...<br> O True<br> O False

NNADVOKAT [17]

Answer:

True

Explanation:

Microscope is an instrument which is used to observe small objects. There are many types of microscope with a different magnitude.

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3 years ago

Two ways friction is harmful when riding a bike

Nat2105 [25]

If your bike isn't the right size, your legs could be rubbing up against the seat of your bike. The friction can chafe the skin on your legs. If you were to crash your bike, skidding on the ground can cause anywhere from minor scrapes to serious friction burns.

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3 years ago

Which statement is true with respect to standard reduction potentials?

hichkok12 [17]

Answer:

C). Half-reactions with SRP values greater than zero are spontaneous.

Explanation:

SRPs or Standard Reduction Potentials are characterized as the ability of a probable distinction among the anode and cathode of a usual/standard cell. It aims to examine the capacity of chemicals to reduce themselves.

The third statement asserts <u>a true claim regarding the SRPs(Standard Reduction Potentials) that the 'half-reactions which take place with the SRP possesses the values higher than zero and they are unconstrained</u>.' The other statements are incorrect as they either show the estimation of SRPs more than 0 or display them as being restricted. Thus, <u>option C</u> is the correct answer.

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3 years ago

Solid substance A has a melting point of 100°C. Liquid substance B has a freezing point of 110°C. For each substance, identify i

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Answer:

both will be at liquid state. the particles will move rapidly in all directions and will collide with other particles in random motion

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3 years ago