Answer:
750 ml
Explanation:
Given parameters:
Number of students in the class = 15
Volume of solution needed per student = 50ml
Unknown:
Volume of solution needed for the whole class = ?
Solution:
The total volume needed for the class;
= number of students x volume of solution per student
= 15 x 50
= 750ml
The volume of solution needed by the teacher for the whole class is 750mL
Which severe weather event is most likely to occur when glaciers melt at a faster than usual rate?
A. Floods
B. Hurricane
C. lighting
D. winter weather
Answer:
A -floods
Explanation:
When the Glaciers melt it causes water
What is the mass number of an atom containing 7 protons and 7 neutrons?
Answer:
14
Explanation:
Neutrons are neutral and if there are no electrons to cancel out the protons you add the neutrons and protons together
how many atoms it would take to make up the thickness of a banknote.
Answer:
Since one banknote has a thickness of about 0.1 millimeters, if all the banknotes produced in a year were stacked up, they would reach a height of approximately 300 kilometers, which is about 80 times the height of Mount Fuji.
what are sediments???????????????????????
Answer:
what are sediments???????????????????????
Explanation:
Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice or by the force of gravity acting on the particles.
I hope that helped you.
Answer:
a naturally occurring material that is broken down by processes of weathering and erosion.
Explanation:
Dictionaries help with definitions such as the one I've given you. :)
What is the basis for analyzing an energy transfer diagram?
The mechanical energy input and output must be equal.
Heat must always be the largest output.
The sum of all outputs must equal the input.
Electrical energy is an input but not an output.
Answer: The sum of all outputs must equal the input:
Explanation:
Draw activation energy diagrams for the following reactions labeling reactants, products,
activation energy, activated complex, and enthalpy change.
a. 4Al + 30, 2A1,O, AH=-30J/mol
b. 24,0 H2H2 + O, AH=30J/mol
Answer:
i dont no
Explanation:
i need answer please
Why is it important to always be yourself and not try to be like someone else?
Answer:
You Just Have To Be Yourself To Succeed
Your difference is a strength that you will have to learn to exploit to your advantage. Thus, you should not compare yourself to others because it is a behavior that can only slow you down in your progress. Indeed, everyone progresses at their own pace in life. Your unique and beautiful just the way you are, you don't have to change yourself because of people are judging you. You just have to be yourself!
Explanation:
Who is a army ( Stream dynamite)
Answer:
Me!!!
Explanation:
Use the drop-down menus to indicate the stage of technological design in which each action would occur
Answer:
Explanation:
whats the thing to put 2 gether
What do hurricanes, tornadoes, and thunderstorms have in common?
Answer choices: cold temperatures
low pressure systems
storm surge
precipitation
Answer:
What do hurricanes, tornadoes, and thunderstorms have in common?
ANSWER : Low pressure systems
nuclear equation of Rn-220 alpha decay
When air absorbs more energy and heats up, the air molecules slow down.
True
False
50 POINTS
Answer:
False
Explanation:
Bombarding plutonium-239 with an alpha particle creates an isotope of curium. Balance the equation. 239 94 Pu + 4 2 He → a b Cm + c d n Identify the values for the unknown letters. a is b is c is d is
Answer:
242
96
1
0
Explanation:
Knowing the functioning of balancing equations, we have that the values of the constants correspond to 242, 96, 1 e 0.
Given the equation we have:
[tex]239 \ 94 Pu + 4 2 He \rightarrow a b Cm + c d[/tex]
Knowing from the beginning that nothing is lost and nothing is created but everything is transformed, we will have that the value of the constants will be given by:
D: will be equal to zero because two constants together don't mean anythingC: will be equal to 1 for the same reason as D.so for a and b we will calculate as:
[tex]239+3=a\\a=242\\94+2=b\\b=96[/tex]
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Identify the NMR term that corresponds to each description.
A) The end of the NMR spectrum close to the reference signal
B) The end of the NMR spectrum far from the reference signal
C) The appearance of multiple peaks for a single nucleus due to neighboring nuclei
D) The frequency at which a nucleus absorbs and resonates with a magnetic field
E) The area of a signal that corresponds to the number of nuclei at that frequency
Answer:
A- upfield
B- down field
C- splitting
D- chemical shift
E- integration
Explanation:
NMR is a spectroscopic technique commonly used to observe the magnetic fields around the nucleus of atoms in a compound under investigation.
A chemical shift is the difference in parts per million (ppm) between the resonance frequency of the observed protons in the compound under study and that of the tetramethylsilane (TMS) (the reference compound in NMR with a chemical shift of zero ppm because all protons in the compound are equivalent).
If signals appear close to the reference signal, the signals are said to appear upfield. If the signals appear far away from the reference, they are said to appear down field.
The presence of protons cause splitting of peaks to the magnitude of n+1. n is the number of neighboring protons. Splitting refers to the appearance of multiple peaks for a single nucleus due to neighboring nuclei.
The area of a signal that corresponds to the number of nuclei at that frequency is called the integration.
The enthalpy of solution (∆H) of NaNO₃ is 20.4 kJ/mol. If 6.10 g NaNO₃ is dissolved in enough water to make a 100.0 mL solution, what is the change in temperature (°C) of the solution? (The specific heat capacity of the solution is 4.184 J/g･°C and the density of the solution is 1.02 g/mL)
The enthalpy of solution is the heat evolved or absorbed in solution. From the calculations performed, the enthalpy of solution is 3.2°C.
What is is heat of solution?The term heat of solution refers to the heat evolved or absorbed when a substance is dissolved in water.
Number of moles of NaNO3 = 6.10 g/85 g/mol = 0.07 moles
Heat absorbed = 20.4 kJ/mol * 0.07 moles = 1.43 kJ
Mass of solution = 1.02 g/mL * 100 mL = 102 g
Mass of system = 102 g + 6.10 g = 108.1 g
Heat capacity of solution = 4.184 J/g･°C
From;
H = mcdT
1.43 * 10^3 J = 108.1 g * 4.184 J/g･°C * dT
dT = 1.43 * 10^3 J/108.1 g * 4.184 J/g･°C
dT = 3.2°C
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What is the correct formula for copper(ii) oxide
Answer:
CuO
Explanation:
Copper(II) oxide is a metal oxide it has the formula CuO. It has formula of copper(2+). Cupric oxide, or copper (II) oxide
Please Help!!
A researcher takes a 10 mL sample of HCl from a bottle and titrates it with NaOH. It was found that 22.4 mL of 0.25 M NaOH were required to reach the equivalence point. What is the concentration of the HCl in original bottle?
Answer : The concentration of the HCl in original bottle is 0.56 M.
Explanation :
According to neutralization law:
[tex]M_1V_1=M_2V_2[/tex]
where,
[tex]M_1[/tex] = concentration of HCl
[tex]M_2[/tex] = concentration of NaOH
[tex]V_1[/tex] = volume of HCl
[tex]V_2[/tex] = volume of NaOH
Given:
[tex]M_1[/tex] = ?
[tex]M_2[/tex] = 0.25 M
[tex]V_1[/tex] = 10 mL
[tex]V_2[/tex] = 22.4 mL
Now put all the given values in the above formula, we get:
[tex]M_1\times 10mL=0.25M\times 22.4mL[/tex]
[tex]M_1=0.56M[/tex]
Therefore, the concentration of the HCl in original bottle is 0.56 M.
1-isopropyl-2-methylcyclohexane identify the numbers of hydrogen atoms
Explanation:
I think 20
0 in the photo should be 1, 1, 1
In 1-isopropyl-2-methylcyclohexane, the number of hydrogen atoms is 18, and this is also an isomer of the cyclohexane, there is a methyl group on the first carbon and an isopropyl group on the second carbon in 1-isopropyl-2-methylcyclohexane.
What is the significance of 1-isopropyl-2-methylcyclohexane?It is significant as it has a methyl group and an isopropyl group, it is an isomer of the cyclohexane, and it is a compound that can exist in multiple forms with different properties, such as in the field of organic chemistry, uses in industry, etc.
Hence, in 1-isopropyl-2-methylcyclohexane, the number of hydrogen atoms is 18, and this is also an isomer of the cyclohexane, there is a methyl group on the first carbon and an isopropyl group on the second carbon in 1-isopropyl-2-methylcyclohexane.
Learn more about methylcyclohexane here.
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Using a triple beam balance and a graduated cylinder, a student collected data on a sample of an element:Mass of sample = 18.9 gVolume of water = 30.0 mLVolume of water and sample = 35.0 mL..... using SigFig Rules *
The question is incomplete; the complete question is;
Using a triple beam balance and a graduated cylinder, a student collected data on a sample of an element:
Mass of sample = 18.9 g
Volume of water = 30.0 mL
Volume of water and sample = 35.0 mL
Calculate the density of the sample using sig figs.
Answer:
3.8 g/mL
Explanation:
Mass of sample = 18.9 g
Volume of water = 30.0 mL
Volume of water and sample = 35.0 mL
Volume of the sample = 35.0 mL – 30.0 mL = 5.0 mL
D = m/v
D = 18.9 g / 5.0 mL =3.8 g/mL
Which type of stem supports trees and lives for several years?
leafy
herbaceous
woody
flowerin
Answer:
I am thinking it is woody based off of what I've seen and read.
A certain element has 12 neutrons and 12 protons. Assume that this atom has an
overall neutral charge.
What is the identity of this element?
A 6.2-L balloon at 55˚C and 615mm Hg is taken to the top of Mt. Everest (-35˚C and 400- mmHg). What is the size of the balloon?
Explanation:
wish I could help but I'm lost
Answer: 6.788
Explanation: Water expands 9% when frozen and if the baloon is filled with all 6.2-L then its just 9% of 6.2 which is 0.588 then add it toghether unless your asking something else becuase im not smart and I can't even divided. :p
Calculate the volume in mL of a 0.600 M NaCl solution that contains 0.00123 moles of NaCl.
The volume in of a 0.600 M NaCl solution that contains 0.00123 moles of NaCl is 2.05mL
How to calculate volume?The volume of a substance can be calculated using the following expression:
molarity = no. of moles ÷ volume
According to this question, a 0.600 M NaCl solution contains 0.00123 moles of NaCl.
volume = 0.00123 moles ÷ 0.600 M
volume = 0.00205L
Therefore, the volume in of a 0.600 M NaCl solution that contains 0.00123 moles of NaCl is 2.05mL.
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What is the first organic compound prepared in laboratory?
What is the first organic compound prepared in laboratory?
➪ Urea was the first organic compound which was synthesised from inorganic chemicals. Fredrich Wohler is known for the synthesis of Urea. He formed the compound with ammonium cyanate, an inorganic salt.
Answer:
Urea
Explanation:
The credit of invention goes to Fredrick wohler .He synthesized ammonium cyanate to Urea .It drawbacked the theory organic compounds can't be prepared artificially
Uh yah I’ll give you the crown thingy! And extra points:)
You are given a sulfuric acid solution of unknown concentration. You dispense 10.00 mL of the unknown solution into an Erlenmeyer flask and add 12.2 mL of distilled water and a drop of phenopthalein to the flask. You fill your buret with 0.103 M NaOH (aq) solution and begin the titration. During the titration you rinse the tip and the sides of the Erlenmeyer flask with 3.52 mL of distilled water. It requires 10.38 mL of your NaOH (aq) solution to reach the endpoint and a very faint pink color in the flask. What is the concentration of your sulfuric acid solution in M (Remember the balanced equation for this reaction)?
Answer:
"0.053457 M" of sulfuric acid.
Explanation:
The given values are:
[tex]V[/tex] = 10 mL solution
[tex]V_{added}[/tex] = 12.20 mL
[tex]V_{total}[/tex] = 22.20 mL
then,
M 0.103 M of NaOH,
[tex]V_{rinsed}[/tex] = experiment will not be affected
[tex]V_{total \ base}[/tex] = 10.38 mL
Now,
⇒ mol of NAOH = MV
= [tex]0.103\times 10.38[/tex]
= [tex]1.06914 \ m[/tex]
Whether Sulfuric acid, then
⇒ [tex]H_{2}SO_{4} + 2NaOH = Na_{2}SO_{4} + 2H_{2}O[/tex]
⇒ [tex]mol \ of \ acid =\frac{1}{2}\times \ mol \ of \ base[/tex]
⇒ [tex]1.06914 \ m \ mol \ of \ base = \frac{1}{2}\times 1.06914 = 0.53457 \ m \ mol \ of \ acid[/tex]
Before any dilution:
[tex]V_{sample} = 10 \ mL[/tex]
⇒ [tex]M \ acid = \frac{m \ mol}{V}[/tex]
[tex]=\frac{ 0.53457 }{10}[/tex]
[tex]=0.053457 \ M[/tex] (Sulfuric acid)
Consider the reaction 3X + 2Y 5C + 4D
How many moles of C can be synthesized from 31.0 moles of Y and excess X?
D
Answer:
This problem is providing a chemical equation between two hypothetical elements, X and Y and asks for the molesof X that are needed to
produce 21.00 moles of D in excess Y. After the following work, the answer turns out to be 15.75 mol X:Mole ratios:In chemistry, one the most crucial branches is stoichiometry, which allows us to perform calculations with grams, moles and particles (atoms, molecules and ions). It is based on the concept of mole ratios, whereby the moles of a specific substance can be converted to moles of another one, say product to reactant, reactant to reactant, reactant to product and product to product.
Calculations:In such a way, since 21.00 moles of D are given, we need the mole ratio of D to X in order to get the answer, which according to the reaction is 3:4 based on their coefficients in the reaction. Hence, we calculate the required as follows:
Explanation:
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A sample of 8.5 g NH3 on oxidation produces 4.5 g of NO. Calculate the percent yield.
Reaction: 4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g)
Answer:
The answer is 30%
What is the number 0.0513 expressed in scientific notation?
Answer:
5.13x10>-2
Explanation:
Which is a redox reaction
Answer:
D
Explanation: