Answers
Answer:
the hole in Earth was caused by a meteorite
Related Questions
de metals lose or gain electrons in a ionic bond
Answers
metal lose
Explanation:
metal give electron to nonmetal
Answer:
lose
Explanation:
If x represents the molar solubility of Ca(OH)2 , what is the correct equation for the K sp ?
Ksp=x^2
Ksp=2x^3
Ksp=4x^3
Ksp=x^3
Answers
Answer:
Ksp = 4x³
Explanation:
Step 1: Write the reaction for the solution of calcium hydroxide
Ca(OH)₂(s) ⇒ Ca²⁺(aq) + 2 OH⁻(aq)
Step 2: Make an ICE chart
Let "x" be the molar solubility of calcium hydroxide.
Ca(OH)₂(s) ⇒ Ca²⁺(aq) + 2 OH⁻(aq)
I 0 0
C +x +2x
E x 2x
Step 3: Write the expression for the solubility product constant (Ksp)
The solubility product constant is equal to the product of the concentrations of the products raised to their stoichiometric coefficients.
Ksp = [Ca²⁺] × [OH⁻]² = x × (2x²) = x × 4x² = 4x³
if [tex]x[/tex] represents the molar solubility of calcium hydroxide then correct equation for the Ksp is [tex]\bold {x^3}[/tex]
Solubility product constant Ksp:
It is the equilibrium constant for a solid substance that are dissolved in an aqueous solution. It expresses how much a solute is dissolved in solution.
The reaction of calcium hydroxide for the solution
[tex]\bold {Ca (OH )_2(s) \rightarrow Ca^2^+(aq) + 2 OH^-(aq)}[/tex]
1 mole of calcium hydroxide is dissociate into 1 mole of calcium ion and 2 moles of Hydroxil ion.
The Ksp equation for the solution,
[tex]\bold {Ksp =[Ca^2^+][ OH^-]^2}\\[/tex]
If [tex]x[/tex] represents molar solubility,
[tex]\bold {Ksp =[x][ x]^2 = x^3}\\[/tex]
Therefore, if [tex]x[/tex] represents the molar solubility of calcium hydroxide then correct equation for the Ksp is [tex]\bold {x^3}[/tex]
To know more about Ksp,
https://brainly.com/question/4736767
Based on the kinetic theory, which statement is true?
Matter consists of only large molecules.
Matter is made up of only charged particles.
The particles of matter are in constant motion.
The particles of matter have zero kinetic energy.
Answers
Answer: the particles of matter are in constant motion
took the test
Liquids have no definite shape
True/False
Answers
You have a solution of NaOH that is 3.0 M. If you need 250 mL of a 1.5 M solution, what volume of the stock solution should you use?
Answers
Answer:
answer is 30 g!!!!!!!!!
What pressure is required to compress 200 liters of air at 1.00 atmosphere into a cylinder whose
volume is 20.0 liters?
Answers
Answer:think it’s 10
Explanation:
Gaseous ammonia, NH3, is obtained from the reaction of gaseous hydrogen and gaseous nitrogen. According to this reaction, what volume, in L, of nitrogen is required to completely react with 25.0 L of hydrogen under STP conditions?
Group of answer choices
8.32 mL
8.32 L
8.20 L
8.00 L
Answers
Answer:
8.33 L .
Explanation:
Hello there!
In this case, according to the given problem, it is possible to firstly write up the undergoing chemical reaction:
[tex]3H_2+N_2\rightarrow 2NH_3[/tex]
Whereas the mole ratio of hydrogen to nitrogen is 3:1. In such a way, given that the mole ratios can be also applied in volume when the temperature and pressure remain unchanged, it is possible to compute the required volume of nitrogen from 25.0 L of hydrogen as shown below:
[tex]25.0L\ H_2*\frac{1L \ N_2}{3L\ H_2}\\\\=8.33L[/tex]
Best regards!
Oliver needs to standardize a base solution by titration with an acid solution of known concentration. He finds the volume of the acid solution needed to reach the endpoint for a sample of the base solution. Arrange the steps in the order that allows Oliver to determine the concentration of the base solution.
a. Write a balanced equation for the between the analyte and the titrant.
b. Calculate the number of moles of analyte using the stoichiometric coefficients Of the equation.
c. Calculate One number moles of titrant using One volume of titrant required and the concentration of titrant
d. Calculate Ole concentration of the analyte using the number of moles of analyte and the volume of analyte titrated.
Answers
Calculate the # of moles of titrant using the volume of titrant required and the concentration of titrant.
Calculate the # of moles of analyte using the stoichiometric coefficients of the equation.
Calculate the concentration of the analyte using the number or moles of analyte and the volume of analyte titrated.
Titration is a method of standardizing a solution of unknown concentration using a solution of known concentration.
The essence of titration is to standardize a substance of unknown concentration using a substance of known concentration. One of the solutions used for titration must be a standard solution. A known volume of this solution reacts with this solution of unknown concentration and the concentration of the unknown solution is determined.
The steps required to determine the concentration of the base solution are:
Write a balanced equation for the reaction between the analyte and the titrant. Calculate the number moles of titrant using the volume of titrant required and the concentration of titrantCalculate the number of moles of analyte using the stoichiometric coefficients Of the equation.Calculate the concentration of the analyte using the number of moles of analyte and the volume of analyte titrated.Learn more: https://brainly.com/question/4147359
The chemical formula for propane is: CH3CH2CH3 Calculate the molar mass of propane. Round your answer to 2 decimal places.
Answers
Answer:
44.11 g/mol
Explanation:
In order to calculate the molar mass of any molecule, we need to add the molar mass of each atom that compounds it:
Molar Mass of C₃H₈ = (Molar Mass of C) * 3 + (Molar Mass of H)*8Molar Mass of C₃H₈ = (12.01) * 3 + (1.01) * 8Molar Mass of C₃H₈ = 44.11 g/molThe molar mass of propane is thus 44.11 g/mol.
An Introduction To Chemistry
Answer Sheet
Please provide your answer in the answer sheets!
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An Introduction To Chemistry
1. During his distinguished career this scientist received two unshared Nobel prizes. One for chemistry and one for peace.
Alfred Nobel
Marie Currie
Linus Pauling
Albert Einstein
2. The study of matter and the changes it undergoes describes the science of ______.
physics
mathematics
chemistry
biology
3. The _________ is the fundamental unit of matter.
atom
compound
nucleus
proton
4. The atom is composed of three subatomic particles known as _____, ____ and _______.
neutrals, electives and peeons
quarks, alpha rays and xenons
electrons, protozoans and electricals
protons, neutrons and electrons
5. Protons are _________ charged particles found in the nucleus of an atom.
neutrally
positively
negatively
brighltly
6. Electrons are ________ charged particles that orbit the nucleus of an atom.
negatively
positively
neutrally
brighltly
7. Neutrons are ________ particles found in the nucleus of an atom.
negatively charged
positively charged
uncharged
brightly
8. An ion is an atom or molecule that ___________.
is electrically neutral
is composed of two or more elements
is man made
carries a charge
9. Which of the following chemical species is a cation?
Cl-
H+
Au
HCO3-
10. The atomic number of an atom or element describes the number of _______.
electrons orbiting the nucleus
neutrons in the nucleus
alpha particles in the nucleus
protons in the nucleus
11. Mass is proportional to the number of _________ that make up an object.
atoms
cells
neutrons
protons
12. Weight is best described as _____________.
the number of atoms in an object
the pull of gravity on matter
the electrical charge on an ion
the number of electons in an atom
13. Atoms of any one type of element, such as gold, all posess the same number of _______.
electrons
neutrons
protons
nuclei
14. There are currently _______ known elements.
65
98
112
152
15. Element _______ are one or two letter abbreviations for the names of the elements.
numbers
atomic numbers
symbols
characters mass
16. Two or more elements that combine as a result of a chemical reaction form _____.
atoms
ions
mixtures
compounds
17. An example of a mixture would be __________.
a bar of pure gold
the air we breathe
sodium chloride salt
pure water
18. The three states of matter are ________, ________ and _________.
atoms, molecules and compounds
atoms, compounds and mixtures
solids, liquids and gases
solids, gases and steam
19. The least dense and most energetic of the three states of matter is ____.
the gaseous state
the liquid state
the solid state
the elemental state
20. All measurements must consist of both ____________.
a size and a shape
a price and a volume
a number and a unit
a color and a number
21. Density is a physical property that refers to _____________.
the number of atoms in an object
the weight of an object
the mass of an object relative to its volume
the weight of an object relative to its cost
22. A kilogram is equal to ________ grams.
1
10
100
1,000
23. There are _______ centimeters in a meter.
1
10
100
1,000
24. Measurements are _________ because of equipment error and human judgment.
useless
uncertain
perfect
inaccurate
25. The number 221.5 contains ______ significant figure(s).
1
2
3
4
26. The number .001 contains ______ significant figure(s).
1
2
3
4
27. The number 226 would be scientifically noted as ______.
226
2.26 x101
2.26 x 102
22.6 x 101
28. The figure .005 would be scientifically noted as _______.
5 x 10-1
5 x 10-2
5 x 10-3
5 x 10-4
29. Elements or atoms are arranged on the periodic table in the order of increasing ________.
atomic mass
atomic weight
atomic number
atomic symbols
30. A substance that weighs 10 grams and has a volume of 2 cm3 would have a density of ______.
5 g/cm3
10g/cm3
2g/cm3
15g/cm3
31. The terms Kelvin, Celsius and Fahrenheit all correspond to units of _______.
density
hardness
volume
temperature
32. The ________ is the SI standard unit for measurements of length.
cetimeter
foot
meter
yard
33. One kilogram is equal to approximately ________ pounds.
1.2
2.2
3.2
4.2
Answers
1. C. Linus Pauling
2. C. chemistry
3. A. atom
4. D. protons, neutrons and electrons
5. B. positively
6. A. negatively
7. C. uncharged
8. D. carries a charge
9. C. Au
10. D. protons in the nucleus
11. A. atoms
12. B. the pull of gravity on matter
13. C. protons
14. C. 112
15. C. symbols
16. D. compounds
17. C. sodium chloride salt
18. C. solids, liquids, and gases
19. A. the gaseous state
20. C. a number and a unit
21. B. the weight of an object
22. D. 1,000
23. C. 100
24. B. uncertain
25. D. 4
26. A. 1
27.C. 2.26 x 102
28. C. 5 x 10-3
29. C. atomic number
30. A. 5 g/cm3
31. D. temperature
32. C. meter
33. B. 2.2
How many electrons in an atom could have these sets of quantum numbers?
n=3
n=5, l=0
n=6, l=2, ml=-1
Answers
Explanation:
n=3 is basically all the electrons in the 3rd energy level, so
3s=2
3p=6
3d=10
so total equals 18 electrons
n=5, l=1, refers specifically to the 5p
p has 3 orbitals so it can fill a total of 6 electrons
n=6, l=1, ml=-1,
so this refers to the 6p and since we have ml it refers to the specific orbital.
ml refers to the formula: -l -> l.
so in this case -1,0,1 ; these three numbers correspond to the 3 orbitals in the p subshell, each one can hold 2 electrons,
Thus, in this case the answers is 2
Answer: hello, there! your answer is Below.
n=5, l=0
Explanation:
3s=2
3p=6
3d=10
so total equals 18 electrons
n=5, l=1, refers specifically to the 5p
p has 3 orbitals so it can fill a total of 6 electrons
n=6, l=1, ml=-1,
so this refers to the 6p and since we have ml it refers to the specific orbital.
ml refers to the formula: -l -> l.
so in this case -1,0,1 ; these three numbers correspond to the 3 orbitals in the p subshell, each one can hold 2 electrons,
Hope this Helps you!!!
Have a great day!!
What is the pH of a 1x10-2 M NaOH solution?
a. pH = 2
b.pH = 12
c.pH = 1x10-2
d. pH = 1x10-12
Oe. None of the above
Answers
Answer:
A.
Explanation:
I hope I can help
Hahahhahahahahha
State the trend, at standard pressure, of the boiling points of these
noble gases, as they are considered in order of increasing atomic number.
Answers
Which relationship or statement best describes Delta Sfor the following reaction?
CaO(s) + CO2(g) - CaCO3(s)
Multiple Choice
О O
More information is needed to make a reasonable prediction.
ASO
O
ASCO
AS = AHIT
AS > 0
Answers
Answer: [tex]\Delta S[/tex]< 0
Explanation:
Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.
For the reaction [tex]CaO(s)+CO_2(g)\rightarrow CaCO_3(s)[/tex]
In this reaction gaseous reactants are converting to solid products. The randomness will decrease and hence entropy will also decrease. Thus [tex]\Delta S[/tex] is negative or less than zero.
Iron (III) oxide reacts with carbon to give iron and carbon
Fe2O3 + 3C → 2Fe + 3CO
How many grams of CO are produced when 36.0 g of C reacts
Answers
Answer:
84 g of CO.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
Fe₂O₃ + 3C —> 3Fe + 3CO
Finally, we shall determine the mass of CO produce as follow:
Molar mass of C = 12 g/mol
Mass of C from the balanced equation = 3 × 12 = 36 g
Molar mass of CO = 12 + 16
= 28 g/mol
Mass of CO from the balanced equation = 3 × 28 = 84 g
From the balanced equation above,
36 g of C reacted to produce 84 g of CO.
Thus, 84 g of CO were obtained from the reaction.
A biochemist carefully measures the molarity of salt in 23.5mL of photobacterium cell growth medium to be 7.73 mM. Unfortunately, a careless graduate student forgets to cover the container of growth medium and a substantial amount of the solvent evaporates. The volume of the cell growth medium falls to 4.78mL. Calculate the new molarity of salt in the photobacterium cell growth medium.
Round each of your answers to 3.
Answers
Answer: The new molarity of salt in the photobacterium cell growth medium is 38.0 mM
Explanation:
According to the dilution law,
[tex]M_1V_1=M_2V_2[/tex]
where,
[tex]M_1[/tex] = molarity of concentrated solution = 7.73 mM
[tex]V_1[/tex] = volume of concentrated solution = 23.5 ml
[tex]M_1[/tex] = molarity of diluted solution = ?
[tex]V_1[/tex] = volume of diluted solution = 4.78 ml
Putting in the values we get:
[tex]7.73\times 23.5=M_2\times 4.78[/tex]
[tex]M_2=38.0mM[/tex]
Therefore, new molarity of salt in the photobacterium cell growth medium is 38.0 mM
Write a short story in about 150 to 200 words based on the image given below
Answers
so the dude on the throne, a monarch, most likely the king, has a diamond or some other precious object in his hand. meanwhile, there’s a dude sitting on the floor, he looks unhappy, distressed, and maybe a little surprised. so what do you think happened to get to this point? what or who gave the king the diamond? why is the dude on the floor upset? then what’s going to happen? what’s the upset dude gonna
do? what’s the king gonna do? think of answers to the questions and it should start to form
How many grams of Fe2O3 are formed when 51.3 grams of iron, Fe, react completely with oxygen, O2?
4 Fe + 3 O2 --> 2 Fe2O3
Answers
Answer: 73.4 g of [tex]Fe_2O_3[/tex] are formed when 51.3 grams of iron react completely with oxygen.
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} Fe=\frac{51.3g}{56g/mol}=0.92moles[/tex]
The balanced chemical reaction is:
[tex]4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]
As [tex]Fe[/tex] is the limiting reagent as it limits the formation of product.
According to stoichiometry :
4 moles of [tex]Fe[/tex] produce = 2 moles of [tex]Fe_2O_3[/tex]
Thus 0.92 moles of [tex]Fe[/tex] will produce=[tex]\frac{2}{4}\times 0.92=0.46moles[/tex] of [tex]Fe_2O_3[/tex]
Mass of [tex]Fe_2O_3=moles\times {\text {Molar mass}}=0.46moles\times 159.69g/mol=73.4g[/tex]
Thus 73.4 g of [tex]Fe_2O_3[/tex] are formed when 51.3 grams of iron react completely with oxygen.
Help help help help help help
Answers
What happens when a beaker with cold water is held in a yellow burner flame? Explain this.
Answers
when a beaker of water is heated with a yellow burner flame ;
The soot from the flame will be deposited on the outside of the beaker and it will take a longer time to heat up the cold waterYellow burner flames are caused by incomplete combustion of gas and the incomplete combustion results to the presence of soot in the flame. yellow flame produces less heat energy than blue burner flames.
While when a blue burner flame is used to heat a water contained in a beaker the water gets heat up faster and the beaker remains clean ( void of soot deposits ).
Hence we can conclude that when a beaker of water is heated with a yellow burner flame the soot from the flame will be deposited on the outside of the beaker and it will take longer time to heat up the water.
Learn more : https://brainly.com/question/14624172
Which reaction below is a physical change?
a. CH4(g) + 2O2(g) → CO2(g) + 2HsO(l)
b. CaO(s) + H2O(l)→ Ca(OH)2(s)
c. H2O (l) → H2O(s)
D. 2HsO (l) → 2H2(g) + O2(l)
Answers
Answer:
c. H₂O (l) → H₂O(s)
Explanation:
The correct answer is option C: The molecular formulas for the substance(s) on the left side of the equation and on the right side of the equation are identical. This means that there was not a chemical change, but a physical one.
In this concrete example, what happened was a change of states of matter: from liquid (l) to solid (s).
Other reactions have different molecular formulas on both sides of the equation, thus they represent chemical changes.
how much alum product would be lost to the crystallization solution if you had 42.5 ml of solution after filtration and the solubility of alum is approximately 2.63 g alum in 100 ml of 0 degrees celcius acidic water
Answers
Answer:
Total amount of alum lost = 0.5122 grams
Explanation:
Let the total volume of the solution be 100 mL
In 100 mL of solution, there is 2.63 gram of alum.
Out of this 100 mL solution, 42.5 mL is remaining.
Amount of alum in 42.5 mL solution is
[tex]\frac{42.5}{100} * 2.63 = 1.117\\[/tex] grams
Now the amount of alum lost is [tex]2.63 -1.117 = 0.5122[/tex] grams
How to remove candle wax?
Answers
Explain the nitrogen cycle I need a 6th grade answer please
Answers
Answer:
The nitrogen cycle is a repeating cycle of processes during which nitrogen moves through both living and non-living things: the atmosphere, soil, water, plants, animals and bacteria. In order to move through the different parts of the cycle, nitrogen must change forms.
Explanation:
True or False. The Kinetic Molecular Theory of Matter applies to "Real Gases"
Answers
Answer:
The kinetic-molecular theory applies on to ideal gases.. Many gases behave nearly ideally if pressure is not very high and temperature is not very slow. ... Because the attractive forces between gas particles are insignificant, gas particles glide easily past one another.
F
Explanation:
Which term describes a solid that comes out of a solution?
A.granules
B.precipitate
Answers
Part A
How many moles of water are needed to react with 1.7 moles of Li, O?
Given: Li2O + H202LiOH
1.7
0.85
3.4
1.5
none of the above
Answers
Answer:1.7
Explanation:
Where cool air descends to the ground there is a
Select one:
a.
high-pressure zone.
b.
Foehn wind.
c.
valley breeze.
d.
polar front.
Answers
The correct option is (a) Cool air descends to the ground there is a high-pressure zone.
At the top of the troposphere, air moves horizontally; this movement is referred to as advection. Until it lowers, the air gets cooler. A high pressure zone is produced when the air reaches the ground.What is an area of high pressure?Areas with high pressure are those with relatively thick atmospheres. These regions experience winds, though they spiral outward. The air that is still in the high-pressure region progressively falls lower to fill the space left by the ejected air.In which area air pressure is high?According to climatology, air that has been lifted at the equator causes high pressure to develop at the horse latitudes,
also known as the torrid zone, between the latitudes of 20 and 40 degrees from the equator.
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What is exchanged between the system and the surroundings
Answers
Answer:
see note under explanation
Explanation:
When describing system and surroundings the system is typically defined as the 'object of interest' being studied and surroundings 'everything else'. In thermodynamics heat flow is typically defined as endothermic or exothermic. However, one should realize that the terms endothermic and exothermic are in reference to the 'system' or object of interest being studied. For example if heat is transferred from a warm object to a cooler object it is imperative that the system be defined 1st. So, with that, assume the system is a warm metal cylinder being added into cooler water. When describing heat flow then the process is exothermic with respect to the metal cylinder (the system) but endothermic to the water and surroundings (everything else).
The titration of 24.30 mL of HCl solution of unknown concentration requires 12.84 mL of a 0.120 M NaOH solution to reach the equivalence point. What is the concentration of the unknown HCl solution in M?
Answers
Answer:
0.0634 M HCl
Explanation:
Since HCl and NaOH react in a one-to-one mole ratio, we can just use M1V1 = M2V2 to solve for M1 (the concentration of HCl)
M1 = ? M HCl
V1 = 24.30 mL HCl
M2 = 0.120 M NaOH
V2 = 12.84 mL NaOH
M1(24.30 mL HCl) = (0.120 M NaOH)(12.84 mL NaOH)
M1 = 0.0634 M HCl