Homework answers and tutorials

Waiting for answer A solution contains 40. mEq/L of Cl and 15 mEq/L of HPO4 2...
##"55 mEq/L"## The idea here is that you need to use the fact that a solution is electrically neutral to determine how many milliequivalents of sodium cations are needed to balance...
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Waiting for answer What does the symbol ##Delta## in a chemical equation mean?
I have to disagree  ##Delta## doesn't mean heat. ##Delta## actually just means "the change in". e.g. ##Delta##H = the change in . Upper case Greek Delta (##Delta##) signifies the...
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Waiting for answer How can I calculate the densities of a hydrogen nucleus and...
You use the formula for density and the published radii to calculate the densities. The values are ##6.70 × 10^14"kg/dm"^3## and ##2.7"kg/dm"^3##. The formulas to use are ##"Densi...
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Waiting for answer What are dehydration synthesis reactions?
Dehydration synthesis reactions are reactions in which molecules combine by the removal of a H atom and an OH group between them, which together form a molecule of water, ##"H"_2"O"##. Therefore, a new molecule is synthesized while the reacting molecules lose a molecule of water (dehydration) betwee...
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Waiting for answer How can I calculate the empirical formula of a hydrocarbon?
You must be given the percentages, masses, or number of moles of both Carbon and Hydrogen in the problem. The basic steps are: %  Mass  Moles  Whole Number Percent: Assume that the total percentage is out of 100 grams. Then the % = Mass Example: The percentage of Carbon is 56%, so the mas...
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Waiting for answer What is the difference between alternate and corresponding a...
See the picture and explanation below. When two parallel lines are intersected by the third (transversal), they form eight angles: one of the parallel lines forms four angles ##a##,...
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Waiting for answer What is alliteration?
Usin words that start with the same letter or syllable. Alliteration is the term used for phrases where all or most of the words start with the same letter or syllable. It is often...
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Waiting for answer How do you find the square root of 5929?
Factor into primes to find: ##5929 = 7 * 7 * 11 * 11 = (7*11)^2 = 77^2## So ##sqrt(5929) = 77## Let's look for prime factors: ##2##  No  it's not even. ##3##  No  the digits d...
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Waiting for answer The speed of light in a vacuum is ##2.998 xx 10^8 "m/s"##. (...
For part (a) : ##c = 1.079 * 10^(9)"km/h"## For part (b) : ##c = 1.118 * 10^7"mi/min"## To solve this problem you need to be familiar with several conversion factors. More specifical...
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Waiting for answer What is 9 square root of 40 simplified?
##9sqrt(40)## = ##9sqrt(4*10)## = ##9*2sqrt(10)##=##18sqrt(10)## This is because ##sqrt(A) \times sqrt(B) = sqrt(A\timesB)## so by splitting up 40 into its factors, of 4 and 10 and...
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Waiting for answer What is 1.6 as a fraction?
##8/5## ( as a fraction ) 1.6 is the same as ##1+6/10## Multiply by 1 and you do not change the value. However, 1 comes in many forms. ##color(green)([1color(magenta)(xx1)]+6/10"...
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Waiting for answer Why is carbene an electrophile?
Around the carbon in dichlorocarbene there 6 electrons; it would "like" to have 8. The carbon in methane has 6 electrons. Two are inner shell and do not participate in bonding. Eac...
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Waiting for answer When caring for musculoskeletal injuries, what does RICE sta...
R  Rest I  Ice C  Compression E  Elevation Rest Rest means allow the injury time to heal limiting the stress of use. Ice Reduces swelling and pain by reducing blood flow and l...
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Waiting for answer How does a conjugate base differ from the acid hbr?
According to the Brønsted–Lowry theory, an acid is a proton donor, and a base is a proton acceptor. Thus, HBr is an acid because it reacts with water according to the equation HBr + H₂O → H₃O⁺ + Br⁻ In the process, the HBr has donated a proton (H⁺) to the water, and the water has accepted the proto...
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Waiting for answer How did the Treaty of Paris divide land in North America?
The United States gained everything East of the Mississippi River, South of British Canada, and North of Florida. The Spanish gained Florida and everything West of the Mississippi. T...
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Waiting for answer What is an example of exocytosis? What cell type is involved...
Neurotransmitter release. Neurons package neurotransmitters inside the cell and secrete them into the synapse via exocytosis. Neurotransmitter release. Neurons package neurotransmitt...
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Waiting for answer What is the oxidation number of the ##"Mo"## in ##"MoO"_4^(2...
The oxidation number of polyatomic ions is equal to the charge on the ion. The oxidation number of ##"Mo"## in ##"MoO"_4^(2)## will be ##+6## The of all the atoms in a compound mu...
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Waiting for answer When do you accept or reject the null hypothesis in a chisq...
You have two values: Your ##chi^2 ## test statistic, which is the value you calculated. And, your ##chi^2## critical value. Which is the value you took from the table at a certain degrees of freedom and level of significance. If your TEST STATISTIC exceeds your CRITICAL VALUE, you REJECT the nul...
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Waiting for answer In left ventricular systole, which chambers of the heart are...
Ventricles contracting, atria filling with blood. During this phase, the ventricles are contracting  the right ventricle pumps deoxygenated blood into the pulmonary arteries towards...
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Waiting for answer Rank the following gases in order of heaviest to lightest mo...
Got a Periodic Table? You simply have to add up the appropriate masses. The one trick in this question is the molecular weight of chlorine gas. Save for the Noble Gases, ALL the...
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