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hram777 [196]
3 years ago
8

Which has a higher boiling point? please help!​

Chemistry
1 answer:
san4es73 [151]3 years ago
4 0
First choice: PhH4 has a lower boiling point
Second: SiF4 higher
Third: CBr4 higher

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The reaction of 60.0 g of aluminum oxide with 30.0 g of carbon produced CO gas and 22.5 g of aluminum metal. What is the percent
natulia [17]

Answer:

The answer to your question is: 70.8%

Explanation:

Data

Al₂O₃ = 60 g

C = 30 g

CO = gas

Al = 22.5 g

MW Al₂O₃ = 102 g

MW C = 12 g

MW Al = 54 g

Reaction

                 Al₂O₃    +     3C     ⇒       3 CO    +    2 Al

Limiting reactant

                            102 g of Al₂O₃  -------------- 54 g Al

                             60 g                 --------------   x

                             x = 31.8 g

                            36 g of C ------------------ 54 g of Al

                            30 g of C ------------------  x

                            x = 45 g of Al

Limiting reactant = Al₂O₃

Percent yield = \frac{22.5}{31.8} x 100

Percent yield = 70.75 %

5 0
2 years ago
Which term is defined as the change in the direction of light when it goes from one medium into a different medium?
vovikov84 [41]
The term defined as the change in direction of light when it goes from one medium into a different medium is refraction.

Refraction is the change of direction on the propagation of a beam of light when it passes from a medium to other; this only happens when the light travels at different speeds in both media.

When a beam of light that travels in the air incedes in a slab of glass, part of the beam is reflected (bounces) and part is refracted (it penetrates in the glass and changes the angle).


Also,due to the different speeds of light in air and water, when a beam of light passes from air to water, it refracts.
 
7 0
3 years ago
Air should be classified as:
Alex777 [14]

Answer:

element

Explanation:

it is use full for you thanks

6 0
3 years ago
Describe the energy of the products in comparison to the energy the atoms had when the were wandering around the room free.
Over [174]

Answer: The atoms of the solid products are tightly packed whereas those in gas are loose.

Explanation:

Atoms in the solid structure are linked to each other by strong force of attraction and they collectively form an three-dimensional structure. The binding of the atoms form the shape of the solid product. The gas exhibit free atoms in it. The atoms are not linked to one another by strong force of attraction. The atoms as a part of gas have higher energy as those present in the solid products. So, the atoms of the gas wander freely as compared to those in the solid products.

7 0
2 years ago
Why is very important to wait until the crucible is fully coleed to room temperature before weighting
Mars2501 [29]

If you do not wait until the crucible is at room temperature, its density will vary constantly until it reaches this temperature, since density is a property that varies with temperature. For the above reason, weighing a hot crucible will not allow the measurement of a constant weight on the balance, since <u>the weight of the object will be constantly changing, which will not allow a constant reading.</u>

3 0
3 years ago
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