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Questions and answers that actually help you learn.
Chemistry
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Biology
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Trigonometry
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Recent activity
clara
wrote an answer to a
Physics
question
How does optical fiber work?
first: they made the critical angle in the optical fibres very small so that any light incident on it is greater than the critical angle of ...
(more)
44 minutes ago
·
· in
Advanced Optics Applications
,
Physics
Adriana
asked a question in
Chemistry
After zinc reacts completely with HCl, the pressure of gas collected over water in a 36.6 ml tube was measured at to be 890.0mmhg at 20 ...
Answer question
52 minutes ago
·
· in
Vapor Pressure and Boiling
,
Chemistry
Meave60
wrote a comment in
Chemistry
How many moles of boron trifluoride are present in 7.04x(10 over 22 )moles of this compound?
"I meant #"7.04 x 10"^22# molecules."
54 minutes ago
·
· in
The Mole
,
Chemistry
Meave60
wrote a comment in
Chemistry
How many moles of boron trifluoride are present in 7.04x(10 over 22 )moles of this compound?
"Do you mean how many moles are in #"7.04 x 10"^23# molecules?"
56 minutes ago
·
· in
The Mole
,
Chemistry
Allison Shank
wrote an answer to a
Algebra
question
How do you factor #2x+2y+ax+ay#?
In this polynomial #2x+2y+ax+ay#, we want to factor this into two smaller parenthesis by [factoring by ...
(more)
An hour ago
·
· in
Factoring by Grouping
,
Algebra
Ernest Z.
wrote a comment in
Organic Chemistry
How do you calculate the dipole moment of a molecule?
"Fixed formatting and added an example calculation."
An hour ago
·
· in
Dipoles
,
Organic Chemistry
Ernest Z.
updated the answer to a
Organic Chemistry
question
How do you calculate the dipole moment of a molecule?
You can calculate the dipole moment of a molecule from the formula: **Dipole moment = amount of charge × distance between charges** ...
(more)
An hour ago
·
· in
Dipoles
,
Organic Chemistry
Bens'n Third
asked a question in
Chemistry
Electrons are accelerated by 10000 V potential drop .what is the de Brogile wavelength of the electron?
Answer question
An hour ago
·
· in
DeBroglie: Wave Characteristics of Matter
,
Chemistry
Meave60
wrote an answer to a
Chemistry
question
How many molecules of boron trifluoride are present in 1.25 moles of this compound ?
I mole of anything is #"6.022 x 10"^(23)"# pieces or particles of it. So 1 mole of boron trifluoride contains #"6.022 x 10"^(23)"# ...
(more)
2 hours ago
·
· in
The Mole
,
Chemistry
parshotam
wrote an answer to a
Chemistry
question
Find the number of moles- 1- 12gram of CaCO3?
Given: 12g CaCO3 Find: No of mol CaCO3 1 mol CaCO3 = 100g CaCO3 No. of mol = Mass in grams / Molecular mass = ...
(more)
3 hours ago
·
· in
The Mole
,
Chemistry
latifa
asked a question in
Chemistry
A compound is found to contain 25.24% sulfur and 74.76% fluorine by mass. what is the empirical of compound? the molar mass for this ...
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3 hours ago
·
· in
Determining Formula
,
Chemistry
Michael
wrote an answer to a
Chemistry
question
Why reducing power of sodium is least among alkali metals?
The general trend in the reactivity of the group 1 elements is that it increases down the group. This can be attributed to the decrease in ...
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4 hours ago
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· in
Metals and Nonmetals
,
Chemistry
parshotam
asked a question in
Chemistry
How does the rapeseed oil effect on bio-diesel properties? Please in details, Thank you in advance.
Answer question
4 hours ago
·
· in
Chemical and Physical Properties
,
Chemistry
Someone from Shrewsbury, United States asked a question in
Algebra
How many hours will a car traveling at 75 miles per hour take to catch up to a car traveling at 55 miles per hour if the slower car starts ...
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4 hours ago
·
· in
Trends in Data
,
Algebra
parshotam
asked a question in
Chemistry
Can anyone help me about the effect of palm oil on biodiesel properties ??
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4 hours ago
·
· in
Chemical and Physical Properties
,
Chemistry
Someone from Tinley Park, United States asked a question in
Trigonometry
How do you use the properties of inverse trigonometric functions to evaluate #tan arcsin (0.31)#?
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4 hours ago
·
· in
Inverse Trigonometric Properties
,
Trigonometry
Someone from Central District, Hong Kong asked a question in
Algebra
How do you solve proportions?
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4 hours ago
·
· in
Equations with Ratios and Proportions
,
Algebra
Someone from East Lansing, United States asked a question in
Trigonometry
What are the cofunction identities and reflection properties for trigonometric functions?
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4 hours ago
·
· in
Relating Trigonometric Functions
,
Trigonometry
Someone from Downers Grove, United States asked a question in
Algebra
How do you subtract two rational numbers with different denominators?
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4 hours ago
·
· in
Subtraction of Rational Numbers
,
Algebra
Someone from Norwich, United Kingdom asked a question in
Biology
How do gymnosperm leaves differ from angiosperm leaves?
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5 hours ago
·
· in
Plant Structure / Angiosperm vs. Gymnosperm
,
Biology
Lina G.
wrote an answer to a
Trigonometry
question
How does secant graph relate to the cosine graph?
secant graph is a cosine graph that is inversed
(more)
5 hours ago
·
· in
Graphing Tangent, Cotangent, Secant, and Cosecant
,
Trigonometry
Lina G.
wrote an answer to a
Algebra
question
How do you write an equation in slope intercept form given two points?
1- sub the two points you have in the (x,y) intercept 2- you will get a value (either x or y) 3- sub that value back into the other one 4- ...
(more)
5 hours ago
·
· in
Write an Equation Given Two Points
,
Algebra
Sap
wrote an answer to a
Algebra
question
How do you create stem and leaf plot with single digits?
It's easy. Let's say your numbers are 3, 4, and 5. This is all you do: 0 // 3, 4 , 5 Simple as that!
(more)
5 hours ago
·
· in
Stem-and-Leaf Plots
,
Algebra
Lina G.
wrote an answer to a
Biology
question
From where did the first cell came from?
The building blocks of life are certain large molecules such as amino acids, which can be 'accidentally' formed in nature (perhaps when ...
(more)
5 hours ago
·
· in
Animal Classification
,
Biology
Lina G.
wrote a comment in
Biology
Why must a cell divide?
"in order to increase their number, cell divides to make the organism grow "
5 hours ago
·
· in
The Cell Theory
,
Biology
Sap
wrote an answer to a
Algebra
question
How do you graph equations that are written in point-slope form?
You change them to a different form, I like to use [slope-intercept ...
(more)
5 hours ago
·
· in
Linear Equations in Point-Slope Form
,
Algebra
Sap
wrote an answer to a
Algebra
question
How does rate of change relate to slope?
The rate of change is another word for slope. For example, if Charlie adds 12 dollars **per week** to his bank account, he's adding ...
(more)
5 hours ago
·
· in
Rates of Change
,
Algebra
Someone from Herndon, United States asked a question in
Algebra
If 1 light year is 63,240 AU (astronomical units), how far in AUs is Alpha Centauri, which is 4.32 light years from the Earth?
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5 hours ago
·
· in
Dimensional Analysis
,
Algebra
Someone from Edmonton, Canada asked a question in
Algebra
What is the total amount in the account after 12 years if Peter invests $360 in an account that pays 7.25% compounded annually?
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5 hours ago
·
· in
Applications of Exponential Functions
,
Algebra
Someone from United Arab Emirates asked a question in
Organic Chemistry
What is homolytic cleavage?
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5 hours ago
·
· in
Homolytic v Heterolytic Cleavage
,
Organic Chemistry
Someone from Seoul, Korea, Republic of asked a question in
Algebra
What is Newton's formula for projectile motion?
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6 hours ago
·
· in
Use Square Roots to Solve Quadratic Equations
,
Algebra
Someone from Milton Keynes, United Kingdom asked a question in
Algebra
How do you know when you have completely factored a polynomial?
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6 hours ago
·
· in
Factoring Completely
,
Algebra
Jaspreet Kaur
asked a question in
Biology
Why 'Proteases' released in stomach are inactive by nature however , 'Proteases' released in intestines are active at the same time of ...
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6 hours ago
·
· in
Active Transport
,
Biology
Someone from Simi Valley, United States asked a question in
Algebra
What is the difference between an algebraic equation and an algebraic inequality?
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6 hours ago
·
· in
Inequalities that Describe Patterns
,
Algebra
Wataru
wrote an answer to a
Algebra
question
How do you solve and find the extraneous solutions for #2\sqrt{4-3x}+3=0#?
#2sqrt{4-3x}+3=0# by subtracting #3#, #=> 2sqrt{4-3x}=-3# by dividing by #2#, #=> sqrt{4-3x}=-3/2# (Notice that it is now clear that ...
(more)
6 hours ago
·
· in
Radical Equations
,
Algebra
Someone from Sevenoaks, United Kingdom asked a question in
Organic Chemistry
Why are alkenyl and alkynyl halides so bad for SN and E reactions?
Answer question
6 hours ago
·
· in
Comparing and Determing SN1 or SN2 and E1 or E2 reactions
,
Organic Chemistry
Someone from Fresh Meadows, United States asked a question in
Algebra
What is the absolute value of y equals, x+2 ?
Answer question
6 hours ago
·
· in
Graphs of Absolute Value Equations
,
Algebra
Lee
wrote an answer to a
Algebra
question
How do you find the excluded values of #\frac{2x+1}{x^2-x-6}#?
#x=3 and x=-2# Excluded values are the values (of x) that make the denominator 0. Since excluded values make the denominator equal to ...
(more)
6 hours ago
·
· in
Excluded Values for Rational Expressions
,
Algebra
Wataru
wrote an answer to a
Algebra
question
How do you find the excluded values of #\frac{2x+1}{x^2-x-6}#?
Since denominators cannot be zero, we have #x^2-x-6 ne 0# by factoring out, #(x+2)(x-3) ne 0 => x ne -2, 3# Hence, #x=-2# and #x=3# are ...
(more)
6 hours ago
·
· in
Excluded Values for Rational Expressions
,
Algebra
seph
wrote an answer to a
Algebra
question
How can you use proportions and similar triangles to indirectly measure large objects, such as heights of buildings and mountains?
Form a virtual triangle using the object's height and its shadow's length as bases. Form another virtual triangle using another object (a ...
(more)
6 hours ago
·
· in
Scale and Indirect Measurement Applications
,
Algebra
Wataru
wrote an answer to a
Algebra
question
How do you know by looking at a graph that a system of equations has infinite solutions?
I assume that you are working with a linear system with two variables here. If the graphs of the equations happen to be identical, then we ...
(more)
6 hours ago
·
· in
Graphs of Linear Systems
,
Algebra
Ernest Z.
wrote an answer to a
Organic Chemistry
question
Why was #C^13NMR# spectroscopy developed after #H^1NMR# spectroscopy?
#""^13"C"# NMR spectroscopy was developed after #""^1"H"# spectroscopy because the technology was not yet available. 99.99 % of the H ...
(more)
6 hours ago
·
· in
What NMRs Actually Tell Us
,
Organic Chemistry
SeekMore
wrote an answer to a
Trigonometry
question
How do you find #cos( cot^{-1} sqrt{3} )# without a calculator?
![enter image source here](https://d2gne97vdumgn3.cloudfront.net/api/file/paTkIZ9RSzmn6f69wXjo) ![enter image source ...
(more)
7 hours ago
·
· in
Inverse Trigonometric Properties
,
Trigonometry
Karly
wrote an answer to a
Chemistry
question
Define organic chemicals?
An organic compound is a compound that contains carbon. Organic ...
(more)
7 hours ago
·
· in
Functional Groups and Naming
,
Chemistry
Zor Shekhtman
wrote an answer to a
Precalculus
question
What is the graph of a power function?
The *power function* is defined as #y = x^R#. It has a [domain](http://socratic.org/precalculus/functions-defined-and-notation/domain) of ...
(more)
7 hours ago
·
· in
Graphing Power Functions
,
Precalculus
Made
asked a question in
Chemistry
Does water become pure when frozen?
Answer question
8 hours ago
·
· in
Gas Stoichiometry
,
Chemistry
Adriana
asked a question in
Chemistry
If the number of moles of a gas initially contained in a 2.10 L vessel is doubled, what is the final volume of the gas in liters? (Assume ...
Answer question
11 hours ago
·
· in
Molar Volume of a Gas
,
Chemistry
daniel
asked a question in
Physics
What is the long definition of rotational motion? What are the other types of motin?
Answer question
12 hours ago
·
· in
Rotational Dynamics
,
Physics
Sharmila Ganguly
wrote an answer to a
Organic Chemistry
question
What are cyclic compounds?
These are closed chain compounds. Meaning, the bonds form a closed chain unlike the open chain compounds. They look like rings. Examples ...
(more)
13 hours ago
·
· in
Cis and Trans, E and Z for Cyclic Compounds
,
Organic Chemistry
Akshay Parulekar.
wrote a comment in
Calculus
Is there any relation between, 1) Tangent ratio (tan) in trigonometry & Tangent of Circle? 2) Secant (sec) ratio in trigonometry & Secant ...
"Thank you Alan !"
14 hours ago
·
· in
Tangent Line to a Curve
,
Calculus
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