CHEMISTRY HIGH SCHOOL

What is the empirical formula for a compound if a sample contains 3.72 g of P and 21.28 g of Cl?

Answers

Answer 1
Answer: 3.72/30.97=0.120/0.120=1
21.28/35.45=0.600/0.120=5

PCl5
Answer 2
Answer:

Answer:

PCI5

Explanation:

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Okay! So if 50g of Lithium Bromide is mixed with 100g of water at 20 degrees Celsius a solution forms. If the water was heated to 70 degrees Celsius would the solution form faster, slower, or at the same rate and why?

Why is the equation incorrect? Mg₃ + N₂ → Mg₃N₂(A) Some of the subscripts are incorrectly used.
(B) The equation is not balanced.
(C) The valence of the nitride ion is incorrect.
(D) The valance of the magnesium ion is incorrect.
(E) The coefficient of N₂ is incorrect.
Can someone explain this one?

Answers

the valency of nitride and magnesium is incorrect
The calence of nitride ion is incorrect. Nitride ion's valency is 3- (N3-)

According to astronomers , the age of the universe is estimated to be

Answers

The age of the universe is approximately 13.8 billion years old. The universe is constantly expanding. A universe with a low density of matter is older than a matter – dmominated one. To determine the density and composition of the universe, scientists rely on missions such as NASA’s Wilkinson Microwave Anisotropy Probe spacecraft. They measure the thermal radiation left from Big Bang.

If you were asked to convert 25 kg to the unit mg, which of the following would be the first fraction used in the conversion?

Answers

divide twenty-five by one thousand

Heated bricks or blocks of iron were used long ago to warm beds. A 1.49 -kg block of iron heated to 155 Celsius would release how many joules of heat as it cooled to 22 Celsius ?

Answers

Specific heat capacity= Quantity of heat/massxΔT
Shc of iron (constant)= 0.4494J/³C for 1g
1.49kg=1490g
Q=1490x(22-155)x0.4494
Q=89057.598J

Final answer:

The question pertains to the concept of specific heat capacity. Using the formula 'q = mcΔT' where 'q' is the heat transferred, 'm' is the mass of the substance, 'c' is the specific heat and 'ΔT' is the temperature change, we can calculate how much heat a block of iron would release when it cools.

Explanation:

To solve your question, we need to understand the concept of specific heat capacity, which is an intensive property that depends only on the type of substance absorbing or releasing heat. The specific heat capacity (c) of a substance, commonly called its "specific heat," is the quantity of heat required to raise the temperature of 1 gram of the substance by 1 degree Celsius. The specific heat of iron is :

0.449 J/g°C

To calculate the amount of heat released, we need to use the formula for heat transfer as follows:  q = mcΔT where:

  • q is the heat transferred
  • m is the mass of the substance
  • c is the specific heat of the substance
  • ΔT is the change in temperature

In this case, the mass of iron is 1.49 kg or 1490 g, the specific heat capacity of iron is 0.449 J/g°C, and the change in temperature is 155°C - 22°C = 133°C.

By multipying these values in the formula we get: q = 1490g x 0.449 J/g°C x 133°C. Therefore, the block of iron would release calculated amount of Joules of heat as it cooled from 155°C to 22°C.

Learn more about specific heat capacity here:

brainly.com/question/28302909

#SPJ11

A chemist has dissolved a certain substance in water the chemist knows that more of the substance could be dissolved into the water before it stops dissolving there for the current solution is a.) unsaturated b.) saturated c.) supersaturated

Answers

b.) Unsaturated... Because it can take on more.

If it can't take on more, it's saturated. If it takes more than it can hold, it's supersaturated.

Answer:

unsaturated :)

Explanation:

What is the speed of a rocket that travels 8000 meters in 12 seconds?Question 2 options:

667 m


667 m/s


96,000 m


96,000 m/s

Answers

Speed = distance / time
s = 8000 / 12
s = 667 m/s

In short, Your Answer would be Option B

Hope this helps!
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