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Chemistry
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Recent activity
Someone from East Stroudsburg, United States asked a question in
Algebra
What is PEMDAS?
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16 minutes ago
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· in
PEMDAS
,
Algebra
Meave60
wrote an answer to a
Algebra
question
How do you solve for Mayra's speed if Mayra runs 3 and a quarter miles in one-half hour?
Speed (s) is calculated by dividing the distance (d) traveled by the time (t) it took to travel that distance. The equation is #s = d/t#. ...
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32 minutes ago
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· in
Applications of Reciprocals
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Algebra
Meave60
wrote an answer to a
Chemistry
question
Rhenium has two naturally occurring isotopes: Re−185 with a natural abundance of 37.40%, and Re−187 with a natural abundance of 62.60%. The ...
The atomic weight of Rhenium (Re) as found on [the periodic table](http://socratic.org/chemistry/the-periodic-table/the-periodic-table) of ...
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An hour ago
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Isotopes
,
Chemistry
zoya
asked a question in
Chemistry
Why magnetic quantum number is called magnetic quantum number?i have already seen wikipedia so please dont give me any link i want ...
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An hour ago
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· in
Quantum Numbers
,
Chemistry
zoya
asked a question in
Biology
In DNA test FROM CRIME INVESTIGATION we have evidence such as hair,blood , etc from which dna is extracted ,? MY QUESTION IS IF WE GOT SAY ...
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An hour ago
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Blood Capillaries vs. Lymph Capillaries
,
Biology
zoya
asked a question in
Chemistry
What is angular node?i am asking about physical significance .and why s orbital can not have angular node?i know mathematical answer BUT I ...
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An hour ago
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· in
Chemical Equations
,
Chemistry
zoya
asked a question in
Biology
In some viruses the capsid is surrounded by a phospholipid membrane which is derived from the host cell. derived from host cell means?how? ...
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An hour ago
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· in
Cell Membrane
,
Biology
zoya
asked a question in
Biology
Are all whorled leaves compound leaves?in whorled leaves leaves emerge from the same node?
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An hour ago
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· in
Plants Overview
,
Biology
zoya
asked a question in
Biology
FUNGI SPORANGIUM HAPLOID OR DIPLOID?MARK I AM NOT ASKING ABOUT SPORES?i am asking about sporangium i.e fruiting bodies
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An hour ago
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· in
Fungi Overview
,
Biology
zoya
asked a question in
Biology
Coleoptile= protective sheath covering emerging shoot in monocotyledons my question is is coleoptile present only in embryonic stage of ...
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An hour ago
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Plant Control / Hormones
,
Biology
zoya
asked a question in
Biology
Difference between dorsal nerve cord and neural tube?
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An hour ago
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· in
The Five Senses
,
Biology
zoya
asked a question in
Chemistry
What is meant by isomorphous and isostructural compound?
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An hour ago
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Naming Ionic Compounds
,
Chemistry
zoya
asked a question in
Chemistry
Can't we use hybridization concept for ionic compounds?with the help of hybridization we can predict shape of compound ,so if it is not ...
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An hour ago
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· in
Ionic Compounds
,
Chemistry
zoya
asked a question in
Chemistry
during determining hybridization we look only for central atom ,other atoms with which central atom combines ,say for eg.in co2 we take c ...
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An hour ago
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· in
Orbital Hybridization
,
Chemistry
Someone from Pullman, United States asked a question in
Biology
What are common mistakes that students make with holometabolous development?
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2 hours ago
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Animal Classification
,
Biology
Someone from Woodside, United States asked a question in
Biology
What are some examples of lophotrochozoans?
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2 hours ago
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· in
Animal Classification
,
Biology
Someone from Woonsocket, United States asked a question in
Algebra
How do you know which x values to choose when creating a table of values for an absolute value equation?
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2 hours ago
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· in
Graphs of Absolute Value Equations
,
Algebra
Someone from Sunnyvale, United States asked a question in
Algebra
Why does the zero product property work?
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2 hours ago
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· in
Zero Product Principle
,
Algebra
Someone from Anchorage, United States asked a question in
Algebra
What are Compound Inequalities?
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2 hours ago
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· in
Compound Inequalities
,
Algebra
Someone from Fredericton, Canada asked a question in
Biology
What is alternation of generations?
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3 hours ago
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· in
Protists
,
Biology
Someone from Simi Valley, United States asked a question in
Algebra
How do you solve #8=3+|10y+5|#?
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3 hours ago
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· in
Absolute Value Equations
,
Algebra
Meave60
wrote an answer to a
Biology
question
How do ribosomes relate to DNA?
Different forms of RNA have different functions. Messenger RNA (mRNA) transcribes a segment of DNA during the first part of protein ...
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3 hours ago
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· in
Organelles in Eukaryotic Cells
,
Biology
Someone from Berlin, United States asked a question in
Algebra
How do you write the equation for a line containing the points (–4, 1) and (–2, 3)?
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3 hours ago
·
· in
Write an Equation Given Two Points
,
Algebra
Elizabeth P.
wrote an answer to a
Algebra
question
How do you add #3""^3sqrt(2)+5""^3sqrt(16)#?
#3root(3)(2)+5root(3)(16)# needs to be simplified in order to add.In order to add radicals, index and radicand(inside the radical) need to ...
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3 hours ago
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Addition and Subtraction of Radicals
,
Algebra
seph
wrote an answer to a
Algebra
question
How much is the fine if Taylor checked out a book from the library and it is now 5 days late and the late fee is 10 cents per day?
Late #f# be the fine Late #d# be the number of days late There is no flag-down late fee, so the equation for the fine is #f = ...
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3 hours ago
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· in
Trends in Data
,
Algebra
seph
wrote an answer to a
Algebra
question
How do you find the direct variation equation if z is directly proportional to r when #r=412#, #z=51.5#?
Direct variations are expressed in the form #y = kx# where #k# is a constant --- For your problem, #z # is directly proportional to ...
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3 hours ago
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· in
Applications Using Direct Variation
,
Algebra
Meave60
wrote an answer to a
Biology
question
How are DNA chromosomes and genes related?
Chromosomes are made of DNA and [proteins](http://socratic.org/biology/molecular-biology-basics/proteins) called histones. Genes are ...
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3 hours ago
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· in
Nucleic Acids
,
Biology
Someone from Perth, Australia asked a question in
Biology
Why it's important to know the location of an intermediate is upstream or downstream? the concept says " "if a strain with a mutant enzyme ...
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3 hours ago
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· in
Photosynthesis
,
Biology
seph
wrote an answer to a
Algebra
question
How do you use the distributive property to find 20 x 12?
You can break down either number to make it easier to compute. #20 * 12# #=> (10 + 10)(12)# #=> (10)(12) + (10)(12)# #=> 120 + ...
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3 hours ago
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· in
Expressions and the Distributive Property
,
Algebra
Elizabeth P.
wrote an answer to a
Algebra
question
How do you use the distributive property to find 20 x 12?
Distributive Property is often used in mental math. Its purpose is to break down numbers so that it is easier to compute. Distributive ...
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3 hours ago
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· in
Expressions and the Distributive Property
,
Algebra
Michael
wrote an answer to a
Chemistry
question
Figure out the formula where the mass ratio of Al:Cl=1:3.95 The compound contains 44.8% of crystal water??
The % of water is 44.8 so the % of the Al chloride must be 100 - 44.8 = 55.2 Ratio in grams Al : Cl = 1 : 3.95 Ratio in moles : 1/27 : ...
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4 hours ago
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· in
Determining Formula
,
Chemistry
Meave60
wrote an answer to a
Biology
question
How is the life existed on islands where the salty water is only found ?
The water on an island is freshwater, even though it is surrounded by salt water. Rainfall provides freshwater which is collected in rivers ...
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4 hours ago
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· in
Water and Life
,
Biology
Meave60
wrote an answer to a
Biology
question
How many molecules of glucose are in 100 mmoles?
One mole of glucose contains #"6.022 x 10"^(23)"# molecules. One mole equals 1000 mmol. In order to calculate the number of glucose ...
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4 hours ago
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· in
Organic Molecules vs Inorganic Molecules
,
Biology
Someone from Simi Valley, United States asked a question in
Precalculus
What is meant by #tan^(-1)(y/x)# in a polar coordinate formula?
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4 hours ago
·
· in
The Polar Coordinate System
,
Precalculus
Someone from Marietta, United States asked a question in
Algebra
How do you simplify #-|-1|#?
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4 hours ago
·
· in
Additive Inverses and Absolute Values
,
Algebra
Someone from Provo, United States asked a question in
Algebra
How do you check your solutions to a systems of equations using the substitution method?
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4 hours ago
·
· in
Systems Using Substitution
,
Algebra
Someone from Provo, United States asked a question in
Algebra
How do you graph the function #f(x)=-1/2x+3#?
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4 hours ago
·
· in
Graphs of Linear Functions
,
Algebra
Someone from Palm Bay, United States asked a question in
Trigonometry
What is the sum to product formulas?
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4 hours ago
·
· in
Products, Sums, Linear Combinations, and Applications
,
Trigonometry
Elizabeth P.
wrote an answer to a
Precalculus
question
How do I find the vertex of #y=(x+7)^2#?
The equation is in vertex form (#y = a(x-h)^2 + k#) where the vertex is (h, k). Since the original form has you subtracting h, h more than ...
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4 hours ago
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· in
Vertex Form of the Equation
,
Precalculus
Someone from Simi Valley, United States asked a question in
Trigonometry
How do you find all the solutions for #2 \sin^2 \frac{x}{4}-3 \cos \frac{x}{4} = 0# over the interval #[0,2pi]#?
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4 hours ago
·
· in
Solving Trigonometric Equations
,
Trigonometry
Michael
wrote an answer to a
Chemistry
question
Rhenium has two naturally occurring isotopes: Re−185 with a natural abundance of 37.40%, and Re−187 with a natural abundance of 62.60%. The ...
I don't quite understand what the question means so I'll show how to work out #A_r# from these data if that helps. A good way is to ...
(more)
5 hours ago
·
· in
Isotopes
,
Chemistry
BajanLearner
wrote an answer to a
Trigonometry
question
What do you use the law of sines for?
[The Law of Sines](http://socratic.org/trigonometry/triangles-and-vectors/the-law-of-sines) is used when you know either: - Two sides and ...
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5 hours ago
·
· in
The Law of Sines
,
Trigonometry
Someone from United States asked a question in
Algebra
How do you create a table and graph the equation #y=2x-1#?
Answer question
5 hours ago
·
· in
Graphs in the Coordinate Plane
,
Algebra
Wataru
wrote an answer to a
Algebra
question
How are rational numbers related to integers?
By definition, rationals numbers can be written as ratios of integers. *** I hope that this was helpful.
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5 hours ago
·
· in
Properties of Rational Numbers
,
Algebra
BajanLearner
wrote an answer to a
Physics
question
What are some examples of application of the Bernoulli's Principle?
As an engineering or physics student you can see Bernoulli's Principle in action when talking about how **air plain wings generate the lift ...
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5 hours ago
·
· in
Work
,
Physics
Wataru
wrote an answer to a
Algebra
question
Where is the vertex for #y= |x/3-4 |#?
By pulling #1/3# out of the [absolute value](http://socratic.org/algebra/linear-inequalities-and-absolute-value/absolute-value) sign, we ...
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5 hours ago
·
· in
Graphs of Absolute Value Equations
,
Algebra
Someone from Brooklyn, United States asked a question in
Algebra
What are coincident lines?
Answer question
5 hours ago
·
· in
Consistent and Inconsistent Linear Systems
,
Algebra
Hasan C.
wrote an answer to a
Calculus
question
Show how to differentiate both sides of the double-angle formula for cosine:? cos2x=cos^2 x-sin^2 x obtain the double-angle formula for the ...
cos(a+b) = cos(a)*cos(b) - sin(a)*sin(b) if a=b so; cos(a+a) = cos(a)*cos(a) - sin(a)*sin(a) cos(2a) = #cos^2a - sin^2a#
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5 hours ago
·
· in
Implicit Differentiation
,
Calculus
BajanLearner
wrote an answer to a
Physics
question
What is the unit of measurement of specific heat?
**Definition:** The specific heat capacity, **c** , of a substance is the heat required to raise the temperature of 1 kg of that substance ...
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5 hours ago
·
· in
Specific Heat
,
Physics
Wataru
wrote an answer to a
Algebra
question
What percent of a substance is left after six hours if a radioactive substance decays at a rate of 3.5% per hour?
Since the amount of the substance becomes 96.5% each hour, the amount #R(t)# of a radioactive substance can be expressed as ...
(more)
5 hours ago
·
· in
Applications of Exponential Functions
,
Algebra
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