No elements visible!
Ions form between metals and non-metals.
Hope this helps!
22.0 mL of stock solution is used
to produce a .458 M solution after
dilution with 50.0 mL of water. What
is the molarity of the stock solution?
Answer:
0.202M
Explanation:
you will want to use C₁V₁=C₂V₂ to solve for this.
C₁ is the initial concentration, in this problem it is .458 mol/L or M
V₁ is the initial volume, so it will be the 22.0 mL or 0.0220L
C₂ is the new concentration but here it is unknown.
V₂ is the new volume which is 50.0 mL or 0.0500L.
1. So now we plug this information in to the equation:
[tex](.458 mol/l)(0.0220L)=(C_{2} )(0.0500L)[/tex]
2. We then do algebra to get C₂ alone:
[tex]C_{2} =\frac{(.458 mol/L)(0.0220L)}{(0.0500L)} =0.20152 mol/L or M[/tex]
The liters cancel out and take note of the significant figures, there are 3 digits in all numbers in the question, so that means your answer must contain 3 sig figs. The answer 0.0202 rounded.
** instead of converting the mL to L you can also just keep them mL since they will be crossed out anyway. You will still get the correct answer.
Hope this help you! good luck :)
Which strategy will most decrease the number of people sickened by water-borne diseases?
a. increased use of solar power
b. increased use of fungicides
c. improved agriculture
d. better sanitation systems
Answer:
better sanitation systems
1.) ____ N2 + ____ H2 --------->___NH3
2.) ____ AlBr3 + ____ K2SO4 --------------> _____KBr + ____ Al2(SO4)3
Answer:
N2 + 3H2 ------> 2NH3
2AlBr + 3K2SO4------> 6KBr + Al(SO4)3
4. Provide two excerpts from the article that demonstrate the rules of
evidence and the scientific method were followed when creating scientific
explanations. For each excerpt, explain why it demonstrates the scientific
method and rules of evidence were followed. (9 points)
Excerpt 1:
Excerpt 2:
Answer:
In the article it says “
new research by British and American scientistssuggest a chemical not controlled by the international treaty poses apotential risk to the Earth's protective ozone layer.
“ which means America
and Britain retested a certain hypothesis by The Montreal Protoco
Explanation:
1) How many molecules of K2CrO4 are in 0.6 moles?
2) How many atoms of K are in 0.6 moles of K2CrO4?
3) You dilute 0.5 mol of NaOH to form 2 L of solution. What is the Molarity of that solution?
4) You dissolve 50 g of sugar to make 250 g of sugar water. What is the percent by mass?
5) A 2 L bottle of 5% vinegar has how much vinegar by volume?
Given the various data from the question, the answers to each question is given below:
1. How to determine the number of moleculesAvogadro's hypothesis
1 mole of K₂CrO₄ = 6.02×10²³ molecules
Therefore,
0.6 mole of K₂CrO₄ = 0.6 × 6.02×10²³
0.6 mole of K₂CrO₄ = 3.612×10²³ molecules
2. How to determine the number of atoms1 mole of K₂CrO₄ contains 2 moles of K.
Therefore,
0.6 mole of K₂CrO₄ will contain = 0.6 × 2 = 1.2 mole of K
From Avogadro's hypothesis,
1 mole of K = 6.02×10²³ atoms
Therefore,
1.2 mole of K = 1.2 × 6.02×10²³
1.2 mole of K = 7.224×10²³ atoms
Therefore, we can say that
0.6 mole of K₂CrO₄ = 7.224×10²³ atoms of K
3. How to determine the molarityMolarity is defined as:
Molarity = mole / Volume
From the question given above, we obtained the following:
Mole = 0.5 mole Volume = 2 LMolarity =?Molarity = mole / Volume
Molarity = 0.5 / 2
Molarity = 0.25 M
4. How to determine the volumeFrom the question given above, the following data were obtained:
Mass of solute = 50 gMass of solution = 250 gPercentage of sugar =?Percentage = (mass of solute / mass of solution) × 100
Percentage of sugar = (50 / 250) × 100
Percentage of sugar = 20%
5. How to determine the volumeTotal volume = 2 L
Percentage of vinegar = 5%
Volume of vinegar =?
Volume = percent × total volume
Volume of vinegar = 5% × 2
Volume of vinegar = 0.1 L
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Compared to rodents, rabbits have an extra pair of incisors and other skeletal structures that are different. They also have some features that are similar. What can scientists conclude from this observation?
Compared to rodents, rabbits have an extra pair of incisors and other skeletal structures that are different, scientist can conclude from this observation that they are serially homologous.
What are serially homologous?Serial homologous organs or structures are those that are structurally similar but have been modified to perform distinct functions.
As rodents and rabbits both have some similar functions and some changes in the skeletal structure, so that they both are serially homologous.
Hence scientist conclude that rodents and rabbits are serially homologous animals.
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A beaker is filled with 5.7 grams of nitrogen gas in a fixed volume of 4.0 Liters. One of the valves opened ad
there remains only 3.8 grams of nitrogen gas, calculate the new volume of gas
2.67 L
Answer:
New volume of gas is still 4.0 litres
Explanation:
Gases have no definite shape or volume. They therefore take the shape of their containers. Hence, volume of gas in a container is determined by the volume of the container. Though some gas was lost after the opening of one of the valves, volume of gas still remains the same.
Order the following chemicals from lowest to highest melting point.
Copper (II) chloride
Lead
Tungsten
Caffeine
Silver
Sodium chloride
Answer:
Caffeine, lead, Copper(ii) chloride, Sodium chloride, silver and tungsten
A peptide consisting of nine amino acids was partially hydrolysed. Three different tripeptides were isolated. None of the tripeptides share a common amino acid. Based on the data, what is the total number of possible structures possible for the full-length peptide?.
Which of the following properties of an object can change when a substance undergoes a physical change?
Color
Odor
Reactivity
Size
PLS HELPPPP
Answer:
color , odor , size ( all the options except for reactivity )
Explanation:
A physical change involves a change in physical properties. Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.
Oxygen gas is collected under pressure (1,000 mm Hg) and occupies 1,600 cm^3. What will be the new pressure if the volume is expanded to 3,000 cm^3 and the temperature remains constant
Explanation:
Hola Mi nombre es que eres Rodríguez López
Determine the number of moles of gas contained in each of the following:
a. 1.25 L at 250.0 K and 1.06 atm
b. 0.80 L at 27°C and 0.925 atm
c. 7.50 102 mL at -50.0°C and 0.921 atm
(a) The number of moles of gas for first case is 0.065 mol.
(b) The number of moles of gas for second case is 0.03 mol.
(c) The number of moles of gas for third case is 0.038 mol.
Number of moles of the gasThe number of moles of the gas is determined by applying ideal gas equation as follows;
PV = nRT
n = PV/RT
where;
R is gas constant = 0.082057 L.atm/mol.KFor 1.25 L at 250.0 K and 1.06 atmn = (1.06 x 1.25) / (0.082057 x 250)
n = 0.065 mol.
For 0.80 L at 27°C (300 K) and 0.925 atmn = (0.8 x 0.925) / (300 x 0.082057)
n = 0.03 mol
750 mL at -50.0°C (223 K) and 0.921 atmn = (0.75 x 0.921)/(223 x 0.082057)
n = 0.038 mol
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Which area of chemistry is concerned with reaction rates?
)
A)
A
inorganic
B)
kinetics
organic
D)
redox
Answer:
Explanation:
The branch of physical chemistry that is concerned with understanding the rates of chemical reactions is called Kenetics.
Giving BRAINLIEST, please HELP!
Answer:
Third choice see below
Explanation:
Weight change of potato chip .45 - .42 = .03 gm
Assume all of the heat from burning the chip goes into the water (and none goes into the air or heating the can)
24 degrees - 21 degrees = 3 degrees C temp change
spec heat water = 1 cal / g -cal
50 gm * 3 degrees * spec heat water = 150 calories
150 calories = 150/1000 Calories
Now for the potato chip
150/1000 Calories / .03 gm = 5 Cal/gm
A chemical reaction that produces electricity would be.
Answer:
Exothermic
Explanation:
Exothermic describes a process or reaction that releases energy
An ideal gas, initially at a volume of 6 L and pressure of 8 kPa, undergoes isothermal expansion until its volume is 8 L and its pressure is 6 kPa. Calculate the work done by the gas during this process. Answer in units of J.
The work done by the gas against an external pressure during the isotherma expansion is -12 J.
Work done by the gas against an external pressure
The work done by the gas against an external pressure during the isotherma expansion is calculated as follows;
W(net) = ΔP x ΔV
where;
ΔP is the change in pressure for the cyclic processΔV is change in volumeW(net) = (6 kPa - 8kPa) x (8L - 2L)
W(net) = - 12 kPa.L
W(net) = -12 J
Thus, the work done by the gas against an external pressure during the isotherma expansion is -12 J.
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What is one thing that could have prevented the Chernobyl tragedy?
Answer:
Many things could of prevented the Chernobyl tragedy. Such as better staff training. If the Soviet government had learned from the lessons of the past and if they had not been so averse to spending money.
Explanation:
Have A Great Day
Hope This Helps
~Zero~
What science and math jobs are expected to have much faster than average growth? check all that apply. natural sciences managers zoologists and wildlife biologists medical scientists food science technicians biochemists and biophysicists mathematical technicians
Answer:
Medical Scientists and Biochemists and Biophysicists
Hope This Helps!!
Answer:
its Medical Scientists and Biochemists and Biophysicists
Explanation:
i got it right
how much heat would be released if 2 moles of nitrogen and 2 moles of oxygen form 4 moles of NO (g) at 101.3 kPa and 298 K
-361 kJ/mol heat would be released if 2 moles of nitrogen and 2 moles of oxygen form 4 moles of NO (g) at 101.3 kPa and 298 K.
What is the enthalpy of formation?Enthalpy of formation is defined as the heat change that is needed for formation of one mole of a substance from its constituent elements in pure state.
In the present case, Heat of formation of 4 moles of NO (g) at 101.3 kpa and 298 k is -90.25 kJ/mol. The Negative sign indicates that, heat is evolved from the system.
Thus, for 4 moles of NO, the heat of formation will be 4 X (-90.25 kJ/mol) = -361 kJ/mol.
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i need help with this please i think that this is what you guys need to do this but im not sure so im sorry if its not
its for science btw i had to put chemistry because i couldnt find science in the subject thing
Answer:
producer of t4he food chain is the grass,the producer gets is enrgy7 by the sun and i dont4 know number 2 that4s all i know sorry
Explanation:
Which chemical element was discovered first microsoft rewards.
Answer:
phosphorous
Explanation:
A necessary prerequisite to the construction of the periodic table was the discovery of the individual elements. Although elements such as gold, silver, tin, copper, lead and mercury have been known since antiquity, the first scientific discovery of an element occurred in 1649 when Hennig Brand discovered phosphorous.
What is the volume (in liters) of a 5.52 gram sample of O2 at STP?
Answer:
1
Recall that at STP, 1 mole of any ideal gas occupies 22.4 liters. Volume O2 gas = 0.0510 moles O2 x 22.4 L/mole = 1.14 liters (3 sig.
Explanation:
hope this helps
Can someone please help me? :(
Answer:
A, and b, hope this is right
Explanation:
what happens to oysters if there are too many hydrogen ions in the ocean
2. At about what temperature will 37 g of both copper(II) sulfate and potassium chloride disse
in 100 g of water?
The temperature at which 37 g of both copper(II) sulfate and potassium chloride dissolve in 100 g of water is approximately 38 ⁰C.
What is solubility?The solubility of a substance is its ability to be dissolved in water.
Solubility of 37 g of Copper (II) sulfateThe solubility of 37 g of Copper (II) sulfate is determined from the solubility curve of Copper (II) sulfate.
Solubility of 37 g of potassium chlorideThe solubility of 37 g of potassium chloride is determined from the solubility of potassium chloride.
Thus, from the solubility charts, the temperature at which 37 g of both copper(II) sulfate and potassium chloride dissolve in 100 g of water is approximately 38 ⁰C.
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Which of the following chemical reactions will produce a precipitate?
Answer:
naclo4+koh naoh+kclo4
Explanation:
if you know your cemestry
Answer:
it's A
Explanation:
Predict the neutral organic product of the reaction of cycloheptene with water and sulfuric acid.
The term hydration of an alkene is defined as the addition of water across a double bond.
What is hydration?The term hydration of an alkene is defined as the addition of water across a double bond. The process of hydration always yields an alcohol as -OH is aded to one of the carbon atoms in the doube bond.
The reaction commences with the attack of the -OH group by water and is completed by a proton from acid. The neutral organic product of the reaction of cycloheptene with water and sulfuric acid is shown in the image attached.
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i need help now!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
C
Explanation:
Remark
You have to take into account what the brackets mean. They enclose a complex ion. So (SO4)3 means that you multiply the number of atoms inside the brackets by the number on the right.
Sulphur for example has a 1 after it, but the 3 on the outside multiplies the 1 by 3.
Oxygen has 4 after it. So the number of oxygens is 4*3 = 12
Givens
Blue = Aluminumyellow = sulphurgreen = oxygenAnswer
Blue = 2
Yellow = 3
Green = 12
C
What is the role of neutrons in the nucleus? Be specific, there are two things the neutron does for the atom.
Answer:
makwe me brainliest pls hope it helps;)
Explanation:
Neutrons are electrically neutral, but contribute to the mass of a nucleus to nearly the same extent as the protons. Neutrons can explain the phenomenon of isotopes (same atomic number with different atomic mass). The main role of neutrons is to reduce electrostatic repulsion inside the nucleus
To reconstruct a face, which of the following characteristics can NOT be determined from the skull?
shape of the jaw
shape of the cheekbones
Shape of ears
width of eyes