QUESTION 1

1 answer:

7 0

This question is Graham’s law. It states that one molecule will diffuse X times faster than another molecule, where x = square root (high atomic mass / low atomic mass). If you plug in hydrogen and helium’s masses, it’s root(4/1), or 2. That means hydrogen is twice as fast a helium, so helium will take 32 hours

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Please select the word from the list that best fits the definition

sammy [17]

Pretty sure it’s ,B. Microscope!

8 0

3 years ago

Element A has an electronegativity of 2.20. Element B has an electronegativity of 3.44. The bond of molecule AB is then best des

sashaice [31]

Answer: The bond of molecule AB is then best described as a covalent bond

Explanation: The bond molecule AB is covalent because the difference in their electronegativity is not very big

4 0

3 years ago

Read 2 more answers

Equal volumes of H2 and O2 are placed in a balloon and then ignited. Assuming that the reaction goes to completion, which gas wi

nirvana33 [79]

The reaction is

2H₂(g) + O₂(g) ---> 2H₂O

Thus as per balanced equation two moles of hydrogen will react with one moles of oxygen.

There is a directly relation between moles and volume. [One mole of each gas occupies 22.4 L of volume at STP]

Thus we can say that two unit volume of hydrogen will react with one unit volume of oxygen

Now as we have started with equal units of volume of both oxygen and hydrogen, half of oxygen will be consumed against complete volume of hydrogen

so the gas which will remain in excess is oxygen

4 0

3 years ago

As the number of protons and neutrons in the nucleus increases, elements are much less likely to form stable, non-radioactive is

Murrr4er [49]

<span>The answer is iron. Iron has an atomic number of 26. This means than iron has 26 protons in it's nucleus. However, not all iron atoms have the same number of neutrons. Most commonly iron has 30 neutrons, but it also has 3 other stable isotopes. The word stable is important here because unstable elements are radioactive.</span>

7 0

3 years ago

Number 14 please help.. chemistry

Zolol [24]

Taking into account the definition of density, the mass of a substance with a volume of 150 cm³ and a density of 1.5 $\frac{g}{cm^{3} }$ is 225 grams.

<h3>What is density</h3>

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.

Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

$density=\frac{mass}{volume}$

From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

<h3>Mass of the substance in this case</h3>

In this case, you know that: