If 21.3 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 297 Kelvin and 1.40 atmospheres? Show all of the work used to solve this problem. 2Li (s) + 2H2O (l) yields 2LiOH (aq) + H2 (g

Answers

Answer 1

Answer: Hope it helped you.

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Arrange the isotopes of sulfur and phosphorus in order of decreasing number of neutrons.Rank the isotopes from most to fewest neutrons. To rank items as equivalent, overlap them.

S-36
P-35
S-32
P-33
P-32
P-31

Answers

Neutrons=mass number-atomic number
most S-36 and P-35(both have 20 neutrons) (36-16=20)(35-15=20)
P-33 (33-15=18neutrons)
P-32 (32-15=17 neutrons)
least S-32 and P-31 (both have 16 neutrons) (32-16=16)(31-15=16)

Calculate the mass percent composition of sulfur in Al2(SO4)3.

Answers

The molar mass of aluminum sulftae is 342.14 g/mol.

Since the subscript shows that there are 3 sulfurs within the substance, the total mass of sulfur is 96.21g/mol

Now take the mass of the sulfur and divide it by the molar mass of aluminum sulfate, then multiply by 100:
(96.21/342.15)(100) = 28.1% mass composition of sulfate

In a laboratory experiment, John uses a mesh to separate soil particles from water. Which technique of separation is he using?

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He is using filtration technique

It's a technique which is used for separation of solids and fluids by putting them through a medium which allow only fluid to pass through, leaving the solids (in this case the soil) alone.

The fluid that passed is called the filtrate

What is frezzing pointvof light

Answers

Answer:

Depends from where the light is

Explanation:

If it is in the north pole than it will be 0°C

Answer:

You cannot freeze light.

Explanation:

Only some scientists have been able to freeze light. But, they have only been able to freeze light for about 1 minute.

A researcher is using a particle accelerator in an expriment studying isotopes. How can the researcher change on isotope into a different isotope of the same element?

Answers

Neutron capture reactions.

Explanation

Isotopes of the same element have the same number of protons in each nucleus. However, their nucleus differ in the number of neutrons. Adding one or more neutrons to a nucleus will converts it to a different isotope of the same element.

Neutrons can be produced with a particle accelerator. The researcher might aim fast moving alpha particles $\phantom{}_2^(4)\text{He}$ from the accelerator at a beryllium Be target.

$\phantom{}_4^(9) \text{Be} + \phantom{}_2^4\text{He} \to \phantom{}_{\phantom{1}6}^(12)\text{C} + \phantom{}_(0)^(1) \text{n}$

Doing so will convert beryllium-9 to carbon-12 and release one neutron.

The neutron produced in this process moves very fast ("fast neutrons"). It might knock protons or alpha particles off the target nucleus. This is undesirable since the nucleus will have a change in its proton number. It will end up belonging to a different element.

The researcher should reduce the speed of those neutrons. Passing neutrons through moderators greatly reduces their speed. Moderators are materials that are rich in light nuclei. They remove the energy of neutrons as the two collide. Examples of moderators are heavy water (D₂O) and graphite (carbon). Slow neutrons are easier to capture than fast-moving ones. Combining those slow-moving neutrons to the source isotope will likely produce a different isotope of the same element.