The distance between stars is typically measured in

Answers

Answer 1

Answer: The distance between stars is typically measured in light years, or the amount of distance traveled by light in one year. This is because stars are extremely far apart, and measuring the distance with a smaller unit of measurement would result in ridiculously large numbers that would be difficult to work with.

Answer 2

Answer:

Final answer:

The typical measure for the distance between stars is the light-year. Light-year and parsec are units used to quantify the enormous distances in the universe.

Explanation:

The distance between stars is typically measured in light-years. This term, 'light-year', refers to the distance that light can travel in one year, which is approximately 9.461 trillion kilometers or 5.879 trillion miles. Another less commonly used unit is the parsec, which is equivalent to about 3.26 light years. Such large units are necessary due to the vast distances between stars in the universe.

So, The distance between stars is typically measured in light-years.

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How are journals helpful to scientists

Answers

They help keep track of notes and experaments

The election configuration has of an element is 1s^2 2s^2 2p^1. How many valence electrons does the element have?

Answers

Answer:

it has 3 valence electrons

Explanation:

2+2+1 is 5, boron is 5 and its in the 3rd group

0.5 grams of sodium chloride is dissolved to make 0.05 liters of solution. How do I solve this?

Answers

The concentration of the solution has been 0.17 M.

The molarity has been defined as the moles of solute that has been dissolved in a liter of solution. The molarity of the solution has been expressed as:

$\rm Molarity=(Mass)/(Molar\;mass)\;*\;(1)/(Volume\;(L))$

Computation for Molarity of the solution

The molar mass of sodium chloride solution has been 58.5 g/mol.

The given mass of NaCl in the solution has been 0.5 grams.

The volume of NaCl solution has been 0.05 L.

Substituting the values for molarity of the solution:

$\rm Molarity=(0.5)/(58.5)\;*\;(1)/(0.05\;L)\n\nMolarity=0.17 M$

The concentration of the solution has been 0.17 M. The solution has been prepared by dissolving 0.5 g NaCl in minimal water, and makeup the volume to 0.05 L.

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If you are trying to find the molarity of this solution you first need to find the number of moles of sodium chloride that are present in the 0.5g sample. To do this you need to divide the mass of sodium chloride (0.5g) by its molar mass (58.45g/mol) to get 0.00855mol of sodium chloride. Then you divide the number of moles (0.00855mol) by the volume of solution (0.05L) to get 0.171M (The units for molarity is mol/L). Therefore the solution has a concentration of 0.171M.

I hope this helps. Let me know in the comments if anything was unclear or if you were asking a different question.

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.

Reference

Vitz, Ed. et. al, "19.5: Neutron Bombardment", ChemPRIME (Moore et al.), Libretexts Chemistry, 2017

Answer:

D. BY ADDING OR REMOVING NEUTRONS.

Hope this helps!

Explanation:

What term best describes the rate of radioactive decay for a particular radioactive element?A. fast
B. slow
C. variable
D. constant

Answers

Answer:

correct answer is option C (constant)

Explanation:

Radioactive decay of radioactive element occur at known rates, the unit of radioactive decay is called half-life. The amount of time a radioactive element takes for half of the parent atoms to decay is known as half-life of a radioactive element

During Radioactive decay radioactive elements emits a particle. It's impossible to predict exactly when a given atom of a substance will emit a particular particle, but the decay rate of a radioactive element over a long period of time is constant.

By radioactive decay scientist can determine the age of that particular element. If radioactive decay will vary than age cannot be determined from radioactive decay.

The rate of radioactive decay for a particle radioactive element is constant.

Starch and cellulose are both produced by plants, yet one is easily digested by animals and the other is not. Discuss the differences in the structures of these two molecules and how this may impact whether they can be digested.

Answers

Starch andcellulose have the same substance but different structures. They are bothpolysaccharides. The basic unit of a polysaccharide is the glucose. Glucose,which contains carbon, hydrogen, and oxygen, have two forms. The alpha-glucosewith an alcohol group attached to carbon 1 is down and the beta-glucose withthe alcohol group attached to carbon 1 is up. Starch is the alpha-glucose whilecellulose is the beta-glucose. Starches are linked into a straight chain whereasthe cellulose are connected like a pile of stack paper. When the human bodyeats starch, it can digest the starch but not the cellulose because it has noenzyme that can break it down.

Final answer:

Starch is easily digested by humans due to the presence of enzymes breaking its α-glucose bonds, while humans lack the enzymes to break the β-glucose bonds in cellulose, rendering it indigestible but essential as dietary fiber.

Explanation:

Starch and cellulose are both polysaccharides produced by plants. Their structural differences, however, determine how they can be digested by animals. Starch is made up of α-glucose molecules, which are joined together by 1-4 and 1-6 glycosidic bonds, forming a helical structure. The human digestive system has enzymes like amylase that can break these bonds, enabling the digestion of starch.

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