CHEMISTRY MIDDLE SCHOOL

What is a phase diagram

Answers

Answer 1
Answer:

Answer:

A phase diagram is a diagram representing the limits of stability of the various phases in a chemical system at equilibrium, with respect to variables such as composition and temperature.


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MIDDLE SCHOOL

if you looked at a sugar cube through a magnifying lens,you would see it is made up of ------of sugar.

Answers

Grains
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MIDDLE SCHOOL

Bill and Amy want to ride their bikes from their neighborhood to school which is 14.4 kilometers away. It takes Amy 40 minutes to arrive at school. Bill arrives 20 minutes after Amy. How much faster (in meters/second) is Amy’s average speed for the entire trip? Be sure to show all necessary metric conversion

Answers

2 m/s

Explanation:

The distance to school is 14.4 kilometers which are equal to 14400 meters.

Amy takes 40 minutes which are equal to 40 × 60 = 2400 seconds to arrive at school.

Bill takes 40 + 20 = 60 minutes which are equal to 60 × 60 = 3600 seconds to arrive at school.

Amy’s average speed = distance (m) / time (s)

Amy’s average speed = 14400 m / 2400 s = 6 m/s

Bill’s average speed = 14400 m / 3600 s = 4 m/s

How much faster (in meters/second) is Amy’s average speed for the entire trip?

Amy’s average speed - Bill’s average speed = 6 m/s - 4 m/s = 2 m/s

Learn more about:

average speed

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HIGH SCHOOL

Tell me a hypothesis for the corrosion experiment for iron nails?

Answers

The more acidic the substance is, the more the iron nails will corrode (this obviously depends on what your experiment is but hope this helped in some way)
HIGH SCHOOL

Compare the practical uses and limitations of nuclear fission and fusion. Include in your answer a detailed description of the two processes, comparing and contrasting them in terms of the types of atoms involved, the conditions needed to get the reaction started, and the types of products produced.

Answers

Nuclear fusion and nuclear fission are two different types of energy-releasing reactions in which energy is released from high-powered atomic bonds between the particles within the nucleus. The main difference between these two processes is that fission is the splitting of an atom into two or more smaller ones while fusion is the fusing of two or more smaller atoms into a larger one Nuclear fusion is the reaction in which two or more nuclei combine together to form a new element with higher atomic number (more protons in the nucleus).

Explanation:

Fission and Fusion are two nuclear processes by which massive amount of energy is released. Both fission process and fusion process are similar in the nature that they produce energy from atoms but differ in a ways that they both are opposing processes. Simply, fusion is the union of two atoms to form a single large atom while fission is the splitting of a single atom into two atoms.

The applications of both the processes are not same. Fission is used to generate energy in nuclear power plants while fusion process is not use since it is not possible to control the reaction in fusion process.

       Nuclear fission reaction takes place when a large and unstable uranium isotope is bombarded with high speed neutrons. This causes the uranium isotopes to into further two smaller isotopes, three more high speed neutrons and generating a large amount of energy.

      While fusion reaction takes place at sun where two isotopes of hydrogen atoms combines to form one helium atom and a neutron with a massive amount of energy is released. This is uncontrolled reaction.

COLLEGE

Determine the balanced chemical equation for this reaction.C8H18(g) O2(g)→CO2(g) H2O(g)Enter the coefficients for each compound in order, separated by commas. For example, 1,2,3,4 would indicate one mole of C8H18, two moles of O2, three moles of CO2, and four moles of H2O.

Answers

Answer: The coefficients are 2, 17, 8 and 18

Explanation:

A balanced chemical equation always follow law of conservation of mass.

This law states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form. This also means that total number of individual atoms on reactant side must be equal to the total number of individual atoms on the product side.  

For the given chemical reaction, the balanced equation follows:

By Stoichiometry of the reaction:

2 moles of octane reacts with 25 moles of oxygen gas to produce 16 moles of carbon dioxide gas and 18 moles of water vapor.

Hence, the coefficients are 2, 25, 16 and 18

Answer:

2C₈H₁₈(g) + 25O₂(g)→16CO₂(g) + 18H₂O

Explanation:

To balance an equation, the moles of one element on one side of the equation should be the same as those on the other side of the equation. This is because (as a law of thermodynamics), in a chemical reaction, the matter is not destroyed nor created - atoms are only rearranged.

MIDDLE SCHOOL

Which type of clouds are tall and very dark on the bottom;usually gray black Options:
1.)Cirrus
2.)Stratus
3.)Cumulus
4.)Cumulonimbus

Answers

I think the answer is 4.)Cumulonimbus but I'm not 100% sure
MIDDLE SCHOOL

The difference in elevation between any two adjacent contours on a map is its _____. Select one:
a. contour spacing
b. contour line
c. altitude
d. contour interval

Answers

Your answer would be D
C is the answer you won’t to pick
HIGH SCHOOL

What volume of a 1.00 m stock solution of glucose must be used to make 500.0 ml of a 1.75 ✕ 10–2 m glucose solution in water? (a) 1.75 ml, (b) 8.75 ml, (c) 48.6 ml, (d) 57.1 ml, (e) 28,570 ml?

Answers

Answer : The correct option is, (b) 8.75 ml

Solution :

According to the dilution law,

where,

= molarity of stock solution = 1.00 M

= volume of stock solution = ?

= molarity of glucose solution =

= volume of glucose solution = 500 ml

Now put all the given values in the above law, we get the volume of stock solution.

Therefore, the volume of 1.00 M stock solution required volume is, 8.75 ml

Of Glucose Stock Solution

COLLEGE

A scientist is wondering why a certain region in the ocean doesn't have maximum phytoplankton growth, despite having plenty of nutrients. The scientist samples the water for nutrient levels and finds that there is 2.5 ug/L of Phosphorus and 27ug/L of Nitrogen. What can be said about the water? A) The water is nitrogen limited
B) The water is phosphorus limited
C) The water has an adequate nitrogen and phosphorus, so it is likely iron limited
D) The water has adequate nutrients, but is likely limited by light availability

Answers

Answer:

C The water had adequate nitrogen and phosphorus, so it is likely iron limited.

Explanation:

Phytoplankton are single- cell organisms that live in oceans.

They require nitrogen, phosphorus and trace amount of iron to survive.

From the scientist's results after testing the water for nitrogen and phosphorus,there are reasonable amount of these elements.

Therefore insufficient iron in the water is the reason why he could find plenty phytoplankton in the ocean.

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