Answer:
20L
Explanation:
molar concentration = moles of solute ÷ volume of solution
⇒ 0.5 = 10 ÷ volume
⇒ volume = 10 ÷ 0.5 = 20L
Answer:
Explanation:
moles = mass/molar mass
10 = mass/(1.016 + 35.453)
10 = mass/ 36.469
36.469 * 10 = mass
3646.9 g = mass
molarity = moles/volume
0.5 = 3646.9/volume
0.0001371 = volume
plz help me get it right no links
Answer:
D
Explanation:
earth orbits the sun. the sun doesn’t orbit around earth. and moon take 27 days around the earth
Water evaporates from oceans, lakes, streams, plants and even soil.
TRUE or FALSE
Answer:
True
Explanation:
How heavy is 5 moles of silver in grams?
Answer:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Silver, or 107.8682 grams.
Explanation:
I took a test about this :)
What is the water vapor density maximum at 30 ᵒC? *
1.5 mol/1000 L
1.7 mol/1000 L
30 mol/1000 L
2.3 mol/1000 L
2.3 mol/1000L
Explanation:
relative humidity (rh)is the ratio of the partial pressure of water at a given temprature
|
Describe an important
water resource problem or
problems that can be
addressed using your
research topic.
Answer:There are following reasons:
About 50% fresh water goes waste due to runoff.
More than 1 billion people lack clean drinking water globally.
Population increase is much faster than the increase in the amount of available fresh water.
Per capita availability of fresh water will further decrease in the coming years.
Explanation: PLZ mark Brainlist
Help me get it right and no links
Answer:sorry
Explanation:
Answer:
C
Explanation:
C, because unlike A and B, it's an improvement in human population. And D wouldn't really be classified as an improvement as it states "Population has not decreased or increased significantly."
Hi, am I hot??
Please tell me I’m hot.
Answer:
you hot A S F
Explanation:
The molecules of a substance formed a rigid repeating crystal structure. Then, a phase change occurred. That structure is now more like clusters of molecules moving past one another. What phase change caused this change? Plz, explain your answer.
A
condensing
B
evaporating
C
freezing
D
melting
Answer: everybody report fNnasks he doesn't answer nobody question if you see it like you told me do it yourself science is super easy
Explanation:
HELP THIS IS DUE SOON AND I HAVE MORE WORK TO DO
Answer:
A
Explanation:
Most of the world's active volcanoes are located along or near the boundaries between shifting plates and are called "plate-boundary" volcanoes.
What is a cell? Please help
Explanation:
A cell is the membrane unit that contains all the fundamental molecules to living life. To make it short nd easy, a cell is the smallest nd basic unit of life, it's responsible for all life's processes. The human body is comped of m(tr)illions of cells, they all each provide different types of functions.
The same amount of heat is added to a 10-g sample of each of the following metals. If each metal is initially at 20.0°C, which metal will reach the highest temperature? show your work
A. gold 0.129 J/(g °C)
B. beryllium 1.82 J/(g °C)
C. calcium 0.653 J/(g °C)
D. copper 0.385 J/(g °C)
Answer: A
Explanation:
A
Heat is the product of the mass, specific heat, and delta temperature. The gold metal will reach the highest temperature. Thus, option A is correct.
What is specific heat?Specific heat (c) is the heat required by a substance to get heated a unit mass by a unit of temperature. The specific heat is given as,
[tex]\rm c = \rm \dfrac{Q}{m \times \Delta T}[/tex]
Here, Q is the heat applied, m is the sample's mass and delta T is the change in the temperature.
The value of heat applied is the same for all the metals, so a change in temperature is calculated as,
[tex]\rm \Delta T = \rm \dfrac{Q}{c . m }[/tex]
From this, it can be said that the temperature is inversely related to the specific heat of the metal and hence the metal having the smallest c will have the highest change in the temperature.
Therefore, gold (c = 0.129 J/(g°C)) will reach the highest temperature.
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2H2 + O2 → 2H2O
"PLEASE HELP ASAP"
Which of the following statements would be correct if one mole of hydrogen was used in this reaction? (5 points)
One mole of oxygen was used in this reaction.
Two moles of oxygen were used in this reaction.
One mole of water was produced from this reaction.
Two moles of water were produced from this reaction.
Answer:
- One mole of oxygen was used in this reaction.
- Two moles of water were produced from this reaction.
Explanation:
In addition: - Two moles of hydrogen were used.
Given the data from the question, the correct statement is:
One mole of water, H₂O was produced from the reaction Basic conceptTo know which options are correct, we shall determine the number of mole of O₂ used and the number of mole of H₂O produced.
How to determine the mole of O₂ usedBalanced equation
2H₂ + O₂ —> 2H₂O
From the balanced equation above,
2 moles of H₂ required 1 mole of O₂
Therefore,
1 mole of H₂ will require = 1 / 2 = 0.5 mole of O₂
Thus, 0.5 mole of O₂ is needed for the reaction
How to determine the mole of H₂O producedFrom the balanced equation above,
2 moles of H₂ reacted to produce 2 moles of H₂O
Therefore,
1 mole of H₂ will also react to to produce 1 mole of H₂O
Thus, 1 mole of H₂O was produced from the reaction.
SUMMARY
When 1 mole of H₂ was used in the reaction,
0.5 mole of O₂ was used 1 mole of H₂O was producedConsidering the options given in the question above, the correct statement is:
1 mole of H₂O was producedLearn more about stoichiometry:
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Balance the Equation
Fe
+
HF
FeFz
+ H2
Select ALL the compounds that would be classified as an acid:
HCI
H20
HC2H302
NaCl
KOH
Mg(OH)2
Answer:
option A,B,C
Explanation:
HCl
H2O
HC2H3O2
In the list given , following substance are classified as Acid:
HCl , HC₂H₃O₂ .
What is an Acid ?
A substance that can donate a proton or accept an electron pair to form a bond is called an Acid.
An acid turns Litmus paper red and has pH < 7 , It has the property of neutralizing alkali.
It has sour taste and can dissolve metals.
HCl is a strong acid , H₂O is neutral , HC₂H₃O₂ (Acetic acid) is a weak acid , NaCl is Salt , KOH and Mg(OH)₂ are strong base.
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Conservation of matter means that:
55
Matter is never created nor destroyed.
Matter is always created and destroyed.
Matter always turns into energy
Matter is flexible, it can be created destroyed, or turned into energy
Answer:
Matter is never created or destroyed
which one of the following are not steps of a balanced equation?
Answer:
Dealing with the states of both the reactant and product elements
We can preserve natural resources by
А
drilling for as much oil as possible for just 10 years
B
using mostly trees for energy
с
relying on renewable energy sources
D
burning more fossil fuels
Answer:
drilling for as much oil as possible for just 10 yearsExplanation:
How many atoms in 13.88 mole of lead? (Round to 3 sig figs)
Answer:
8.36 x 10^24 atoms/molecules
Explanation:
Avagadro's Number: 6.02214076 × 10^23
Avagadro's Number shows the number of molecules in 1 mole of substance. In this case, if there is 13.88 moles of lead, we multiply 13.88 by Avagadro's number:
(6.02214076 × 10^23)(13.88) = 8.358536 x 10^24 = 8.36 x 10^24
How much heat energy is needed to raise the temperature of a 150g sample of water from 283 Kto 349 Kif water has a Cp value of 4.18 J/g*K.
This type of bonding can be found in substances that are solids at
room temperature.
Select one:
O a. metallic
O b. ionic
O c. covalent
O d. not enough information
What is the IUPAC name for Ester with 9 carbon atoms ?
Explanation:
[tex]CH _{3}CH _{2}COOCH _{2} CH _{2}CH _{2}CH _{2}CH _{2}CH _{3}[/tex]
NAME: Hexylpropenoate
How many total atoms make up the chemical formula Ca3( PO4)2
12
13
11
10
Answer:
The total atoms present in the chemical formula is 13
Explanation:
According to his prelaboratory theoretical yield calculations, a student's experiment should have produced 1.44g of magnesium oxide. When he weighed his product only 1.23g of magnesium oxide was present. What is the student percent yield?
The percent yield of the product formed in the experiment is 85.41%.
What is percent yield?Percent yield is defined as the ratio of actual yield to the theoretical yield multiplied by 100. If the actual and theoretical yield are same then the percent yield is 100%.If actual yield is less than the theoretical yield then the percent yield is less than 100%.Reason of this condition arising is the incompletion of reaction or loss of sample during recovery process.
In cases where percent yield is over 100% it indicates that more sample is recovered than the predicted amount.This condition arises when there are other simultaneous reactions taking place leading to the formation of product. It can also arise if there is incomplete removal of impurities from the sample .
In the given example, actual yield=1.23 g and theoretical yield=1.44 g
Thus on substituting values in the given formula, 1.23/1.44×100=85.41 %.
Thus , the percent yield of sample is 85.41%.
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Question 1 of 10
Which two factors affect the amount of thermal energy an object has?
A. The directions in which its particles are moving
B. The mass of the object
O C. The amount of motion its particles have
D. The amount of space between its particles
Answer:
b, and d
Explanation:
because it makes the most sense I might be wrong
Reaccion de obtencion del oxido correspondiente al elemento quimico Z= 19. Balancea la reaccion y nombra los reactivos y el producto formado
Answer:
4K + O₂ → 2K₂O
Los reactivos son: Potasio, Oxígeno, y óxido de potasio
Explanation:
El elemento químico número 19 es el potasio, un metal alcalino (Los metales alcalinos tienen estado de oxidación +1).
El óxido correspondiente debe tener fórmula K₂O (Oxígeno con carga -2 y 2 átomos de potasio con carga +1 dan el óxido neutro). La reacción es:
4K + O₂ → 2K₂OLos reactivos son: Potasio, Oxígeno, y óxido de potasio
What kind of changes contribute to spontaneity?
A. Reduced randomness
B. An increase in entropy
C. An increase in enthalpy
D. Absorbed heat in a reaction
Answer:
An increase in entropy
Explanation:
Doing the same question hope this helps
Which is the coefficient in this compound?
4CO2
Answer:
the answer is
Explanation:
number of mollecoles
In chemistry a coefficient denotes the number that is seen in front of the formula of a equation. The coefficient in the given equation 4CO₂ is 4.
What is a coefficient?A number which precedes the formulas of reactants and products in order to balance a chemical equation is defined as a coefficient. It represents the number of atoms or molecules of each elements which are present in the reaction.
A chemical equation should be balanced and it must obey the law of conservation of mass which states that the number of reactants and products on both sides of the equation should be equal.
The coefficients are the numbers which are required to balance a chemical equation and it may vary while balancing a equation. The coefficient is found to be 1 if no number is mentioned in front of the formula of the reactants and products.
In the given equation 4CO₂, 4 is the coefficient which shows that 4 'C' atoms and 8 'O' atoms are present in the compound CO₂.
Thus the coefficient in the compound 4CO₂ is 4.
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Define ductility.
Ty!!
Explanation:
Ductility is the ability of a material to be drawn or plastically deformed without fracture. It is therefore an indication of how ‘soft’ or malleable the material is. The ductility of steels varies depending on the types and levels of alloying elements present. An increase in carbon, for example, will increase the strength but decrease the ductility.
Answer:
ductility of a metal able to be drawn out into a long thin wire.
Collin uses balloons to investigate static electricity. Which of the following BEST
explains what will happen when he brings one negatively charged balloon next to a
positively charged balloon?
Answer:
The positive and negative electrons (or protons, don't really know) are opposites, so they attract each other, giving a whole new meaning to "Opposites attract."
Explanation:
Calculate the [H+], pOH, and [OH-] for the following solutions: SHOW WORK And put Answers for concentration[ ] in scientific notation. ( see video for help)
pH 2.90 (the approximate pH of lemon juice
pH 3.86 (the approximate pH of sauerkraut)
pH 10.81 (the approximate pH of milk of magnesia)
pH 4.11 (the approximate pH of orange juice)
pH 11.61 (the approximate pH of household ammonia)
The pH of human blood ranges from 7.35 to 7.45 with it usually being around 7.40. If the blood pH gets below 7.35 a person goes into acidosis. If the pH gets above 7.45 a person goes into alkalosis. Both acidosis and alkalosis can be fatal. How much more acidic is a person’s blood if it has a pH of 7.3 compared to its preferred 7.4? How much more alkaline is a person’s blood if it has a pH of 7.6 rather than its preferred 7.4?
Answer:
Explanation:
pH = -log{H+]
{H+} = 10^(-pH)
pOH = 14 - pH
{OH-} = 10^(-pOH)
pH 2.90 (the approximate pH of lemon juice
{H+} = 10^(-2.9)
pOH = 14 - 2.9 = 11.1
{OH-} = 10^(-pOH) = 10^(-11.1)
pH 3.86 (the approximate pH of sauerkraut)
{H+} = 10^(-3.86)
pOH = 14 - 3.86 = 10.14
{OH-} = 10^(-pOH) = 10^(-10.14)
pH 10.81 (the approximate pH of milk of magnesia)
{H+} = 10^(-10.81)
pOH = 14 - 10.81 = 3.19
{OH-} = 10^(-pOH) = 10^(-3.19)
pH 4.11 (the approximate pH of orange juice)
{H+} = 10^(-4.11)
pOH = 14 - 4.11 = 9.89
{OH-} = 10^(-pOH) = 10^(-9.89)
pH 11.61 (the approximate pH of household ammonia)
{H+} = 10^(-11.61)
pOH = 14 - 11.61 = 2.39
{OH-} = 10^(-pOH) = 10^(-2.39)