CHEMISTRY HIGH SCHOOL

A compound is found to consist of 1.37g of iron and 2.62g of chlorine. what is the percent by mass of chlorine in the compound?

Answers

Answer 1
Answer: The mass percent of chlorine can be calculated using the following rule:
mass % = (mass of chlorine / total compound mass) * 100

From the givens:
mass of chlorine = 2.62 grams
total compound mass = 2.62 + 1.37 = 3.99 grams

Substitute in the equation to get the mass % as follows:
mass % of chlorine = (2.62 / 3.99) * 100 = 65.6641604%

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HIGH SCHOOL

The ____ _____ of an element includes atomic number plus the number of neutrons.

Answers

The correct answer for this will be 


atomic
mass
It is the Mass Number!!!!!!!
HIGH SCHOOL

How does heat flow when you place an ice cube in your hand?

Answers

From the hand to the ice cube since your hand is warmer than the ice cube.
COLLEGE

Suppose a lab group reports a percent yield of sand of 105%. Is it really possible to collect more sand than was originally present? What is a possible explanation for the “extra” product? Do not consider calculation mistakes; think about the procedure used.

Answers

The maximum percent of yield should be 100%, so It wasn't possible to make a higher than 100% yield like 105% in this problem. If that happens, it will contradict the law of conservation of energy as you can't create mass.

The increased mass might be produced by impurities. One of the examples would be if you rinse the container and left some water. The water is not calculated as a substrate but will increase the results weight. 
There also possibilities that some gas in the air react and produce a solid/liquid material. If you don't weight the gas it would seem that the mass increased.
HIGH SCHOOL

A population expert makes a graph to show the future rates of population growth in various countries. Which is necessary a source of error for him?

Answers

The error of the expert is the fact that future trends cannot accurately be predicted.
Population growth is difficult to predict because we don't know the future events that can alter birth rates, death rates, migration, or resource limitations.
For example a disease starts to kill a lot of people, affecting the growth of the population
HIGH SCHOOL

Exothermic reactions are favored because they release heat to the environment. Would an exothermic reaction be more favored or less favored if it were carried out within a superheated chamber?

Answers

Explanation:

No, an exothermic reaction will not be  favored or less favored if it were carried out within a super heated chamber. In the super heated chamber the heat will flow back to the reaction( considering heat emitted by the reaction is less than the heat in a super heated chamber). So, the reaction will shift backward instead, the product will again change into reactant.

COLLEGE

If the molecular weight of a semiconductor is 27.9 grams/mole and the diamond lattice constant is 0.503 nm, what is the density of the semiconductor in grams/cc ? Two significant digits, fixed point notation.

Answers

Explanation:

The given data is as follows.

      Mass = 27.9 g/mol

As we know that according to Avogadro's number there are atom present in 1 mole. Therefore, weight of 1 atom will be as follows.

            1 atoms weight =    

In a diamond cubic cell, the number of atoms are 8. So, n = 8 for diamond cubic cell.

Therefore, total weight of atoms in a unit cell will be as follows.

            =

            =

Now, we will calculate the volume of a lattice with lattice constant 'a' (cubic diamond) as follows.

                   =

                   =

                   =

Formula to calculate density of diamond cell is as follows.

               Density =

                             =

                            = 2918.1

or,                         = 0.0029 g/cc       (as 1 )

Thus, we can conclude that density of given semiconductor in grams/cc is 0.0029 g/cc.

MIDDLE SCHOOL

Tornados and hurricanes develop over

Answers

High pressure systems 

Answer:

High pressure systems

Explanation:

MIDDLE SCHOOL

List three examples of physical properties. (4 points)

Answers

Examples of physical properties are: color, smell, freezing point, boiling point, melting point, infra-red spectrum, attraction (paramagnetic) or repulsion (diamagnetic) to magnets, opacity, viscosity and density. There are many more examples.
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HIGH SCHOOL

What type of gloves protects your hands from hazardous chemicals? A. Latex Gloves B. Padded Cloth Gloves C. Vinyl or Neoprene Gloves

Answers

Answer: Option (c) is the correct answer.

Explanation:

Vinyl or neoprene gloves provide protection to hands against a wide range of chemicals. They are resistant towards oils, organic acids, alkalies, grease, and many other solvents.

These gloves help hands in completing multiple tasks and have high density and tear resist-ability.

Whereas latex gloves are not good for working with non-water solution hazardous chemicals. On the other hand, padded gloves can absorb chemicals therefore, they can harm the skin. Hence, they are not suitable to deal with hazardous chemicals.


Vinyl or Neoprene Gloves (Option C) is the most suitable answer.
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