Answer:
Explanation:
As the earth revolves around the sun, and the moon revolves around the earth, the intensity of sunlight hitting the moon changes over time. This explains why we get the phases of the moon. The answer as to why, is because the moon was moving towards a state of being a "full moon."
Evan and his friends are working on a group project on matter. Michelle says that matter is anything that has mass. Ricky says matter must have mass and also be touchable. Evan thinks matter must have mass and also be visible. Leon disagrees and says that matter has both mass and takes up space. Who is correct?
Answer:
Leon
Explanation: all take up space and will have a mass to it.
Which statements are true about balancing chemical equations?
Check all that apply.
A. Atoms that are in only one of the reactants and only one of the
products should be done last.
B. Single atoms should be done last.
C. Balancing chemical equations involves trial and error.
D. Balancing chemical equations does not involve trial and error.
SIIRRAT
A. Atoms that are in only one of the reactants and only one of the
products should be done last.
C. Balancing chemical equations involves trial and error.
What is balancing chemical equations?A balanced chemical equation is an equation for a chemical reaction in which the number of atoms for each element in the chemical reaction is the same for both the reactants and the products. In other words, the mass and the charge are balanced on both sides i.e. reactants and products of the chemical reaction. If two atoms are present on the side of reactant then the two number of atoms are present on the side of product, then this equation is called balanced chemical equation.
So we can conclude that option A and C are the statements that are true about balancing chemical equations.
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Answer:
b and c
Explanation:
Calculate the pH of a solution in which one normal adult dose of aspirin (640 mg ) is dissolved in 10 ounces of water. Express your answer to one decimal place.
The pH of the solution in which one normal adult dose aspirin is dissolved is : 2.7
Given data :
mass of aspirin = 640 mg = 0.640 g
volume of water = 10 ounces = 0.295735 L
molar mass of aspirin = 180.16 g/mol
moles of aspirin = mass / molar mass = 0.00355 mol
Determine the pH of the solutionFirst step : calculate the concentration of aspirin
= moles of Aspirin / volume of water
= 0.00355 / 0.295735
= 0.012 M
Given that pKa of Aspirin = 3.5
pKa = -logKa
therefore ; Ka = [tex]10^{-3.5}[/tex] = [tex]3.162 * 10^{-4}[/tex]
From the Ice table
[tex]3.162 * 10^{-4}[/tex] = [tex]\frac{x + H^+}{[aspirin]}[/tex] = [tex]\frac{x^{2} }{0.012-x}[/tex]
given that the value of Ka is small we will ignore -x
x² = [tex]3.162 * 10^{-4} * 0.012[/tex]
x = [tex]1.948 * 10^{-3}[/tex]
Therefore
[ H⁺ ] = [tex]1.948 * 10^{-3}[/tex]
given that
pH = - Log [ H⁺ ]
= - ( -3 + log 1.948 )
= 2.71 ≈ 2.7
Hence we can conclude that The pH of the solution in which one normal adult dose aspirin is dissolved is : 2.7
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How many moles of nitrogen, N, are in 62.0 g of nitrous oxide, N2O?
3) Chemically pure water is A) an element B) a compound C) a mixture D) a solution
When population growth levels off in an ecosystem, it has reached its _________.
it represents the maximum population size a particular environment can support
What is the importance of meteorites?
Answer:
The study of meteorites has helped us understand the beginnings of our solar system, how planets and asteroids formed and how impacts of large meteorites have altered Earth's history and life on our planet.
Explanation:
How many moles are in 15 grams of Li?
Find the density of an object with a mass of 8.7g that has a volume of 25.4ml
Answer:
Density is 0.34
Explanation:
D=m/V
Density is equal to mass divided by volume.
so 8.7 divided by 25.4 is equal to 0.34. The density of that object is 0.34
Convert 77kPa to mmHg.
Answer:
Explanation:
the conversion of 77 Killopascal to millimetre of mercury is
577.547 millimetre of mercury.
which probing question lies within the scope of physics
Answer:
which affect does the industrial wastewater have on acidity of oceans ?
Answer:
which affect does the industrial wastewater have on acidity of oceans ?
Explanation:
6.03g of gas has a volume of 1.00 L at STP determine the g-molar mass of the gas.
Answer:
Molar mass = 135.2 g/mol
Explanation:
Given data;
Mass of gas = 6.03 g
Volume of gas = 1.00L
Temperature = standard = 273 K
Pressure = Standard = 1 atm
Molar mass of gas = ?
Solution:
First of all we will calculate the number of moles of gas.
Formula
PV = nRT
1 atm × 1.00L = n × 0.0821 atm.L/k.mol × 273 K
1.00 atm.L = n × 22.414 atm.L/mol
n = 1.00 atm.L/22.41 atm.L/mol
n = 0.0446 mol
Molar mass:
Molar mass = mass/number of moles
Molar mass = 6.03 g/0.0446 mol
Molar mass = 135.2 g/mol
Activation process and importance of zymogen
Answer:
Zymogen ActivationZymogens are activated by snipping the bonds between two or more amino acids, rather like cutting a balloon string so that it floats away. When the bonds are cut, the enzyme changes its conformation, its 3-D structure, so that the active site is free and able to become active.
Explanation:
How many total atoms are in 0.930 g of P2O5?
Molar mass P2O5 = 31 x 2 + 16 x 5 => 142 g/mol
142 g ---------------- 6.02 x 10²³ molecules
0.930g g ------------ ( molecules )
molecules = 0.920 x ( 6.02 x 10²³ ) / 142
molecules = 5.53 x 10²³ / 142
= 3.89 x 10²¹ molecules
1 molecule P2O5 -------------------------- 7 atoms
3.89 x 10²¹ molecules -------------------- ( atoms )
atoms = ( 3.89 x 10²¹) x 7 / 1
atoms = 2.72 x 10²² atoms of P2O5
2.72 x 10²² atoms of P₂O₅ are there in 0.930 g of P₂O₅.
Molar mass P₂O₅ = 31 x 2 + 16 x 5 => 142 g/mol
142 g atoms are present in 6.02 x 10²³ molecules
Therefore, total number of molecules in 0.930g of atoms is calculated as-
molecules = 0.930 x ( 6.02 x 10²³ ) / 142
molecules = 5.53 x 10²³ / 142
= 3.89 x 10²¹ molecules
1 molecule of P₂O₅ contains 7 atoms
Therefore, the number of atoms in 3.89 x 10²¹ molecules is calculated as
atoms = ( 3.89 x 10²¹) x 7 / 1
atoms = 2.72 x 10²² atoms of P₂O₅
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What is the molarity of a solution made by dissolving 65.0 g of NaNO3 in enough water to make 0.350 L of solution?
First we need the molar mass of NaNO_3:-
[tex]\\ \sf\longmapsto 23+14+3(16)[/tex]
[tex]\\ \sf\longmapsto 37+48[/tex]
[tex]\\ \sf\longmapsto 85g/mol[/tex]
Now we need moles of NaNO_3
[tex]\\ \sf\longmapsto No\:of\:moles=\dfrac{Given\:mass}{Molar\:mass}[/tex]
[tex]\\ \sf\longmapsto No\:of\:moles=\dfrac{65}{85}[/tex]
[tex]\\ \sf\longmapsto No\:of\:moles=0.765mol[/tex]
Now
[tex]\\ \sf\longmapsto Molarity=\dfrac{Moles\:of\:solute}{Vol\:of\:soln.\:in\:L}[/tex]
[tex]\\ \sf\longmapsto Molarity=\dfrac{0.765}{0.350}[/tex]
[tex]\\ \sf\longmapsto Molarity=2.2M[/tex]
What is the formula for finding the molar mass of water?
A.mass of H + 2 + mass of O
B.mass of H x 2 + mass of O
C.mass of H + mass of O x 2
D.(mass of H + mass of O) x 2
Answer:
B is the answer to the questionThe conjugation of the trans/cis product is likely diminished due to steric interactions between the cis-phenyl and the nearby vinyl hydrogen. This interaction likely causes the phenyl ring to twist out of the plane, and thus no longer to be fully conjugated with the adjacent double bond. The trans-trans isomer has no such steric interactions, and thus it is expected to be more fully conjugated. The two isomers are thus may have different light absorbing properties.
Considering all this, which product stereoisomer do you expect to have the highest lambda max value in the UV-V is spectrum- the trans/trans or the cis/trans? Briefly explain your answer.
Answer:
The trans/trans stereoisomer.
Explanation:
So, we are going to have two stereoisomers or arrangements for this chemical compound, that is the Cis/trans, the trans/trans.
For a compound to be seen with UV, the main or primary condition is conjugation or how conjugated the chemical specie or compound is.
Thus, the more the conjugation, the more or the higher the wavelength or lands value.
=> The Trans/trans stereoisomer will have the highest lamda value or wavelength because the energy gap in its π - π* Transitioning deceases due to the STERIC interactions, and the more the decrease in the energy gap, the more or the higher the lamda value or wavelength.
Assess the following statements about fractional distillation. Determine which are TRUE/FALSE
a. Multiple vaporization-condensation cycles are needed to purify samples of relatively close boiling points.
b. The column efficiency of a fractionating column can be assessed by the HETP
c. With every condensation-vaporization cycle, the vapors become enriched in the higher boiling point component
d. A fractionating column is part of the apparatus set-up
The assessments of the given statements on the nature of the fluids and
the fractional distillation processes are as follows;
a. TRUE
b. TRUE
c. FALSE
d. A fractionating column is a glass piece that contains metal pieces or glass beads
What are the correct points regarding fractional distillation?Option a.
Multiple vaporization-condensation cycles enhances the separation of
the components of the mixture;
Thereby enabling purification of the samples that have boiling points
that are close.
Option a is therefore; TRUE
a. Multiple vaporization-condensation cycles are needed to purify samples of relatively close boiling points. TRUEOption b.
The Height Equivalent to Theoretical Plate, HETP, indicates the
efficiency of the separation, and the fractionating column.
Therefore, option b. is TRUE
b. The column efficiency of a fractionating column can be assessed by HETP. TRUEOption c.
After every condensation-vaporization cycle, the condensate contains
more of the more volatile, component and the vapor be comes enriched
in the lower boiling point component.
Therefore, option c is FALSE
c. With every condensation-vaporization cycle, the vapors become enriched in the higher boiling point component. FALSEOption d.
d. The location of a fractionating column is placed vertically between the
mixture to be separated and the 'Y' adaptor, and consist of a straight
tube containing pieces of metals or glass beads.
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26.8 g of ammonium chloride is dissolved in water to make a 0.25 L solution. what is the molarity of the solution
Taking into account the definition of molarity, the molarity of the solution is 2 [tex]\frac{moles}{liter}[/tex].
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Molarity of the solution in this caseIn this case, 26.8 g of ammonium chloride is dissolved in water to make a 0.25 L solution. So you know:
number of moles= [tex]26.8 gramsx\frac{1 mole}{53.45 grams} =[/tex] 0.50 moles (being 53.45 [tex]\frac{grams}{mole}[/tex] the molar mass of ammonium chloride)volume= 0.25 LReplacing in the definition of molarity:
[tex]Molarity=\frac{0.50 moles}{0.25 L}[/tex]
Solving:
Molarity= 2 [tex]\frac{moles}{liter}[/tex]
Finally, the molarity of the solution is 2 [tex]\frac{moles}{liter}[/tex].
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Mandy made the following table describing the conditions required to form sleet and snow, but left something out. Which word should replace the X in the left column?
Temperature in the cloud Below freezing Below freezing
Temperature X Above freezing Below freezing
State of water Mix of solid and liquid Solid
above cloud
below cloud
on the ground
in the soil
I am not the best at this, but im pretty sure its below cloud
Answer:
it is not cloud it is soil
Explanation:
A family is another name for a _____
on the periodic table of elements.
Answer:
Groups
Explanation:
A "family" on the periodic table is also called a "group".
A "group" or a "family" of elements are elements of the same type on the periodic table, for example, all of the transition metals on the periodic table are a "group" or a "family".
c) If a mixture of zinc powder and cobalt(II) oxide is heated, the following reaction occurs: Zn(s) + COO(s) → ZnO(s) + Co(s) (i) Which metal is higher in the reactivity series? (ii) The zinc can be described as a reducing agent. Using this example, explain what is meant by the term 'reducing agent'. (iii) Which substance in this reaction has been oxidised?
Answer:
The metal which reduces the other compound is the one higher in reactivity. So in this case, it is.
Explanation:
what is two or more atoms chemically bonded together?
Answer:
i belive its molecule
Explanation:
Explanation:
when they bond with each other the resultant chemical structure is molecule. the familiar water molecule is h2o
How do I do this program? ASAP
Answer:
Nitrogen is the limiting reactant, and 3.74
grams of ammonia is formed.
Hope this helps
what is the experimental group? on edpuzzle
Answer: An experimental group is a test sample or the group that receives an experimental procedure.
Explanation: This group is exposed to changes in the independent variable being tested. The values of the independent variable and the impact on the dependent variable are recorded. An experiment may include multiple experimental groups at one time.
Hope this helps! :)
Which part of the water cycle happens to most water after surface runoff?
O Collection
O Condensation
Evaporation
O Precipitation
Answer:
collection
Explanation:
Is average atomic mass and atomic mass the same
Answer:
The key difference between atomic mass and average atomic mass is that the atomic mass is the mass of an atom, whereas the average atomic mass is the mass of an atom of a particular chemical element calculated by considering isotopes of that element.
Explanation:
The ionic compound strontium sulfide contains_______ atoms of strontium and________atoms of sulfur.
Answer:
what are the words? I don't see it
50.00 mL of a solution containing 0.15 M CH2 (CO2 H)2 and 0.020 M MnSO4
1. Calculate the mass in g of malonic acid required.
Watch your sig figs! (enter just the number)
Answer:
[tex]m_{solute}=0.78gCH_2 (CO_2 H)_2[/tex]
Explanation:
Hello.
In this case, for the given volume and molarity of malonic acid (solute), we can compute the mass by first computing the moles considering the definition of molarity:
[tex]M=\frac{n_{solute}}{V_{solution}} \\\\n_{solute}=M*V_{solution}=0.15mol/L*50.00mL*\frac{1L}{1000mL}\\ \\n_{solute}=0.0075molCH_2 (CO_2 H)_2[/tex]
Then, since the molar mass of the malonic acid is 104.1 g/mol, we can compute the required mass in g of malonic acid for the preparation of that solution as shown below:
[tex]m_{solute}=0.0075molCH_2 (CO_2 H)_2*\frac{104.1gCH_2 (CO_2 H)_2}{1molCH_2 (CO_2 H)_2}\\ \\m_{solute}=0.78gCH_2 (CO_2 H)_2[/tex]
Notice that the shortest number is the molarity (0.15 M) with two significant figures, that is why the answer is displayed with two significant figures too.
Regards.
State components of reliability’s
Answer:
I need help on this Laugh out loud
Explanation: