Homework answers and tutorials

Waiting for answer Is the number of questions asked during a 1hr lecture a dis...
It is a discrete variable. A discrete variable are WHOLE numbers. Would you ever ask half of a question? Nope! So with each question it would only increase to the next whole number.
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Waiting for answer What is the percentage of cation in ammonium dichromate ?
The formula unit for ammonium dichromate is ##"(NH"_4)_2"Cr"_2"O"_7"##, and has a molar mass of ##252.07 "g/mol"##. The ammonium ion, ##"NH"_4^+"##, is the cation, and its molar mass is ##18.039 "g/mol"##. Since there are two moles of ammonium cations in one mole of ammonium dichromate, we multiply...
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Waiting for answer What are the two stages of photosynthesis?
Light dependent reaction Light independent reaction In lightdependent reactions, the energy from sunlight is absorbed by chlorophyll and converted into chemical energy in the form...
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Waiting for answer What is a compound predicate?
Compound predicates are two or more predicates joined together by a conjunction to create one predicate. Ex. "Carl played baseball and ran the track after school."
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Waiting for answer Why isn't ##Li_2CO_3## (lithium carbonate) soluble in water?
Lithium carbonate is slightly soluble in water. Actually, lithium carbonate is slightly soluble in water, its solubility at ##25^@"C"## being listed at ##"1.3 g/100mL"##. However,...
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Waiting for answer The record high January temperature in Austin, Texas, is 90°...
92. Since it is asking for the difference , that means you have to subtract the two. Since the highest temperature is 90°F and the lowest is 2°F, you have to subtract the two. S...
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Waiting for answer Why is geothermal energy considered a renewable resource?
The heat of the Earth selfreplenishes and so is considered renewable. Geothermal energy refers to energy that is captured from the Earth's crust ( geo referring to Earth and thermal...
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Waiting for answer What's the difference between isothermal process, adiabatic...
They essentially mean: isothermal ~ no change in temperature adiabatic ~ no heat flow involved isovolumetric ~ no change in volume These are generally used as assumptions to simplify an experiment, or simply to put a situation into a more manageable problem in a chemistry course. Specifical...
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Waiting for answer What are the major types of faults and under which type of s...
There are three or four primary fault types: Normal Fault  Occurs when the "hanging wall" moves down relative to the "foot wall" . These faults typically occur due to extensional stress. Reverse or Thrust Fault  Occurs where the hanging wall moves up or is thrust over the foot wall. These fa...
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Waiting for answer The population density of Montana is 6.699 people per square...
##7## people per square mile Rounding ##6.699## to the nearest whole number means that there should be no decimals. Thus, start by looking at the number before the decimal, ##6##....
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Waiting for answer What is the difference between Thrust and Force?
Thrust is basically force.See explanation for more details.. But in thrust there is a internal reaction such as in Jet engines or rocket engines which causes force. This is what we k...
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Waiting for answer Draw Lewis structure ,state the molecular geometry and state...
They are below. ##H_2CO## ##PCl_3## ##NO_2^##
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Waiting for answer How do covalent compounds differ from ionic compounds?
Ionic bonds are created by electrochemical attraction between atoms of opposite charges, while molecular bonds (aka covalent bonds) are created by atoms sharing electrons in order to complete the rule of octet. An ionic compound is created through the electrochemical attraction between a positively...
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Waiting for answer What is an exponent and exponential notation?
Exponential notation is a way of shorthand for very large numbers and very small numbers. But first exponents. They are the numbers that you see at the top right of another number, called the base, as in ##10^2##, where the 10 is the base and the 2 is the exponent. The exponent tells you how many...
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Waiting for answer What is protoplasm in biology?
Protoplasm is the colourless liquid within a cell that comprises the cytoplasm, nucleus and organelles. A cell is made up of a cell wall that contains protoplasm. The protoplasm is...
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Waiting for answer A rectangle is inscribed in an equilateral triangle so that...
##A = (25sqrt(3))/2## First, let's look at a picture. Some initial observations: The area ##A## of the rectangle is ##A=bh##. By symmetry, the base of the triangle is of leng...
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Waiting for answer What is difference between (1) Anion & Anode (2) Cation...
Anion is a negative ion like you can probably name so many examples. ##Cl^()## ##CO_3^(2)## Anode however is the POSITIVE electrode used in electrolytic cells for instance, or in electrophoresis. Why the two seem related (and the nascent confusion I used to have too) is that the ANODE attracts...
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Waiting for answer What is the greatest common factor of ##20x^4## and ##6x^3##...
When we want the GCF, we want the greatest number that can be divided between the number. For ##20x^4## and ##6x^3##, we know that ##x^3## is a common factor. For ##20## and ##6##, it would be 2. So the answer would be ##2x^3##.
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Waiting for answer How do you determine the concavity of a quadratic function?
For a quadratic function ##f(x)=ax^2+bx+c##, if ##a 0##, then ##f## is concave upward everywhere, if ##a 0##, then ##f## is concave downward everywhere.
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Waiting for answer What units of measurement are used for the combined gas law?
For pressure, any unit can be used. Though it's most common to see kilopascals (kPa) or atmospheres (atm), there's no reason you couldn't use bar, torr, or psi. For volume, again, any unit can be used. Because we scientists are fond of the metric system, we prefer metric units like milliliters (m...
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