Answer:
56500J
Explanation:
Given parameters:
Mass of water = 25g = 0.025kg
Temperature of the water = 100°C
Unknown:
Amount of heat required to vaporize the water = ?
Solution:
The amount of heat required to vaporize the water is a function of the mass of the water and the latent heat of vaporization of water.
H = mL
H is the amount of heat
m is the mass
L is the latent heat of vaporization of water = 22.6 x 10⁵J/Kg
H = 0.025 x 22.6 x 10⁵ = 56500J
(2 points) How many grams of K2SO4 are present in 25.0 mL of 7.00 % (m/v) solution?
Show your work. No work = no credit.
Mass of K₂SO₄ : 1.75 g
Further explanationThe concentration of a substance can be expressed in several quantities such as moles, percent (%) weight/volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.
volume of solution = 25 ml
% (m/v)=7%
mass of K₂SO₄ :
[tex]\tt \%m/v=\dfrac{mass~of~solute}{volume~of~solution}\times 100\%\\\\7\%=\dfrac{mass~K_SO_4}{25}\times 100\%\\\\mass~K_2SO_4=7\times 25\div 100=1.75~g[/tex]
A student determines that the number of moles in a sample of Al2O3 is 8.3 moles. How many grams are in the sample?
Mass : 846.268 g
Further explanationThe mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
[tex]\tt mol=\dfrac{mass}{MW}[/tex]
mass of Al₂O₃ :
MW 101,96 g/mol
mass=mole x MW
[tex]\tt 8.3\times 101.96=846.268~g[/tex]
1s22s22p63823p64523d104p5s24d105p5
What is the name of the element?
Answer:
IODINE
Explanation:
The sublevel notation of the element:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁵
To find this element, we must add the powers of the each of the sublevels. This is the number of electrons in the orbital of the atom.
2 + 2 + 6 + 2 + 6 + 2 + 10 + 6 + 2 + 10 + 5 = 53
This give atom has 53 electrons and we can assume it to have an atomic number of 53.
The element is IODINE
how to find the number of neutrons
Answer:
For all uncharged atoms, the number of electrons equals the number of protons. The mass number 40 is the sum of protons and neutrons. To find the number of neutrons, subtract the number of protons from the mass number.
Answer:
mass number- protons
Explanation:
A nitrogen atom in N, should have a
charge of 1-
partial charge 6+.
charge of 0.
partial charge
12. Calculate the no of molecules in:
34g of ammonia molecules, NH3
Answer:
1.2 × 10²⁴ molecules NH₃
General Formulas and Concepts:
Chemistry
Reading a Periodic TableAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Dimensional AnalysisExplanation:
Step 1: Define
34 grams NH₃
Step 2: Define conversions
Avogadro's Number
Molar Mass of N - 14.01 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of NH₃ - 14.01 + 3(1.01) = 17.04 g/mol
Step 3: Convert
[tex]34 \ g \ NH_3(\frac{1 \ mol \ NH_3}{17.04 \ g \ NH_3} )(\frac{6.022 \cdot 10^{23} \ molecules \ NH_3}{1 \ mol \ NH_3} )[/tex] = 1.20157 × 10²⁴ molecules NH₃
Step 4: Check
We are given 2 sig figs. Follow sig fig rules.
1.20157 × 10²⁴ molecules NH₃ ≈ 1.2 × 10²⁴ molecules NH₃
Calculate the number of moles of Cl atoms in 1.81×1024 formula units of magnesium chloride, MgCl2.
Read the volume of the fluid of the graduated cylinder above. Note that each interval is equal to 0.2ml
The volume of the liquid = 8.7 ml
Further explanationGraduated cylinder is a laboratory tool used to measure the volume of liquid
Also called a measuring cylinder
Each line (marked line) on this cylinder shows a scale that shows the total volume of water.
The reading is based on a curve of the fluid formed called the meniscus. Read the measurement of the amount of fluid at the bottom of the meniscus (the position of our eyes is parallel to the level of the meniscus and the cylinder is located in a flat (not tilted) place
If we look at the picture (attached), the meniscus is located between the scale / line 8.6 and 8.8(interval 0.2 ml), so the volume of the liquid shows the number 8.7 ml
Which part of an atom is gained, lost, or shared during a chemical reaction? (2 points)
оа
Electron
Oь
Proton
ос
Neutron
Od
Nucleus
Answer:
a) electron
Explanation:
Answer:
a
Explanation:
i took the test
Ice melting to become water is an example of a physical change.
True or false
Answer:
true
Explanation:
After ice melts into liquid water, you can refreeze it into solid ice if the temperature drops. Freezing and melting are physical changes. The substances produced during chemical changes however cannot easily change back into the original substances.
Calculate the final temperature when 50.0 mL of water at 65.0 °C are added to 25 mL of water at 25.0 °C.
Answer:
x=51.66
Explanation:
1 ml = 1 gram
(mass) (Δt) (Cp) = (mass) (Δt) (Cp)
Substituting values into the above, we then have:
(25)(25-x)(4.184)=(50)(x-65)(4.18)
Solve for x
x= 51.6667
The final temperature is "51.67°C".
According to the question,
At 65°C,
= [tex]\frac{50}{50+25}[/tex]
= [tex]\frac{50}{75}[/tex]
= [tex]0.66667[/tex]
At 25°C,
= [tex]\frac{25}{50+25}[/tex]
= [tex]\frac{25}{75}[/tex]
= [tex]0.33333[/tex]
By multiplying the volume fractions, we get
→ [tex]65^{\circ} C\times 0.66667[/tex] = [tex]43.3334^{\circ}C[/tex]
→ [tex]25^{\circ} C\times 0.33333[/tex] = [tex]8.3333325^{\circ} C[/tex]
hence,
The final temperature will be:
= [tex]43.33334+8.333325[/tex]
= [tex]51.6666^{\circ}C[/tex]
or,
= [tex]51.67^{\circ} C[/tex]
Thus the above answer is right.
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The distance from San Francisco to Los Angeles is approximately 385 miles. 1609 m = 1 mile. How many kilometers is this? Do not enter “kilometers” as part of your answer.
Answer:
619.465 kilometers
Explanation:
1609 m = 1 mile
so 385 miles is equal to 619465 meters (385 x 1609= 619465)
1000 meters = 1 km
so 619465 meters is 619.465 kilometers
Not sure what to do here. It says to convert the following into formulas and states in an unbalanced equation. Please help!
Answer:
Ca2 solid state
H2O liquid state
Ca(OH)2 I believe this would be in solid state
H2 gas state
Explanation:
Based on the information above, which statement provides evidence that a chemical reaction has occurred?
Products release more energy than reactants
Reactants form from the atoms that make up products
There are more atoms in the products than in the reactants
Atoms that make up reactants rearrange into new products
Answer: Atoms that make up reactants rearrange into new products
Explanation:
A chemical reaction is the process of breaking down the chemical bonds of the reacting substances which are commonly called as reactants and making new bonds to form new substances commonly called as products.
The products will contain the same atoms as there are in the reactants but the bonds will rearrange to form different substances.
Every chemical reaction is accompanied with absorption or release of energy.
The molecule NHz contains all single bonds. False or true?
Answer:
true
Explanation:
#45 State whether the following sets of quantum numbers are valid. If the set of quantum numbers aren’t valid, indicate why.Indicate what orbital the electron is in regardless of whether the numbers are valid or not.
n = 3 l = 3 ml= 0 ms= +1/2
n = 2 l = 1 ml= -1 ms= -1/2
n = 3l = 0 ml= 1 ms= +1/2
#46 Give the “COMPLETE” electron configuration for antimony. Is it paramagnetic or diamagnetic? If there are unpaired electrons, indicate how many.
Answer:
(a) "l" cant be more than n-1. n= 3 so l cant be more than 2.
(b) Valid
(c) If l=0, ml can only be 0.
Sb, Antimony, 51 electrons
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p3
paramagnetic 3 unpaired electrons
Explanation:
(a) "l" (lower case L) can be 0, 1, 2 up to n-1. If n=3, l can be 0, 1, or 2.
(b) This set of quantum numbers is valid. n can be 1, 2, 3, ...
since n= 2, l can be any number from 0 to n-1 or 0,1
Since l=1, ml can be -1, 0, 1
ms can always be +1/2 or -1/2
(c) ml can only be from -l to +l. If l=0, ml=0.
If l was 2, ml could be -2, -1, 0, 1, 2
Which statement is true about S-waves?
A They are the slowest selsmic waves.
B They travel only through solids.
They are the first to be detected by
seismometers.
D They can travel through solids and
liquids.
please help
Answer:
B They travel only through solids.
Explanation:
Seismic s-waves are also known as secondary or shear-waves. They are elastic waves that travels within a body.
At a seismic station, they are the second set of waves to arrive after the primary - waves. They can only pass through solid bodies as fluids cannot be sheared. The above mentioned property makes them very useful in determining the interior property of the earth. They are not the slowest seismic waves.what characteristics are shared by elements in the same period row?
Answer:
Elements in the same period have the same number of electron shells.
Explanation:
elements gain electrons and protons and become less metallic
One mole of an atom of a substance is equal to the:
a Gram atomic mass of the element
b Gram molecular mass of the element
C Atomic number of the element
d None of the above
One mole of an atom of a substance is equal to the gram molecular mass of the element. Therefore, the correct option is option B among all the given options.
What is mole?A mole is just a measuring scale. In reality, it's one of the International System of Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. The levels at which chemical reactions frequently occur exclude the use of grams, yet utilizing actual numbers of atoms, molecules, or ions would also be unclear.
A mole consists of precisely 6.022140761023 particles. The "particles" might be anything, from tiny things like electrons and atoms to enormous things like stars or elephants. One mole of an atom of a substance is equal to the gram molecular mass of the element.
Therefore, the correct option is option B among all the given options.
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Which metal absorbs the greatest amount of heat energy
Answer:
This question is incomplete but the completed question is in the attachment below. And the correct is b
Explanation:
Specific heat capacity can be defined as the amount of heat required to raise to raise 1 kg of a substance by 1 kelvin. Thus, this means that when the specific heat capacity of a substance is high, it takes more energy to increase the temperature of that substance. This also means that when different substances are subjected to the same amount of heat, the substance with the higher specific heat capacity will absorb less heat; for example at a beach, water has a very high specific heat capacity, thus when the sand in the beach is hot, the beach water is still relatively cold.
From the description above, it can be seen that the metal with the least specific capacity will absorb the greatest amount of heat, thus the metal is lead with the specific heat capacity of 0.129 J/(g. °C).
What is the name of the 3 lenses that have different powers of magnification 4x, 10x and 40x
Answer:
Scanning Objective Lens (4x)
Low Power Objective (10x)
High Power Objective Lens (40x)
Explanation:
A balloon is floating around outside your window. The temperature outside is 39 °C, and the air pressure is 0.800 atm.
Your neighbor, who released the balloon, tells you that he filled it with 4.70 moles of gas. What is the volume of gas inside
this balloon?
Express your answer numerically in liters.
Answer:
V = 150.49 L
Explanation:
Given data:
Pressure = 0.800 atm
Temperature = 39 °C (39+273 = 312 K)
Moles of gas = 4.70 mol
Volume of gas = ?
Solution:
Formula:
PV = nRT
V = nRT/P
V = 4.70 mol × 0.0821 atm.L/mol.K × 312 K / 0.800 atm
V = 120.39 atm.L/ / 0.800 atm
V = 150.49 L
How many outer-shell d electrons are there in each of the transition-metal ions?Mn(IV) :Co(III) :Fe(II) :Ni(II) :
Answer:
Mn(IV): 3 outer-shell d electrons
Co(III): 6 outer-shell d electrons
Fe(II): 6 outer-shell d electrons
Ni(II): 8 outer-shell d electrons
Explanation:
Mn(IV):
The ion is Mn⁴⁺, so it has lost 4 valence electrons. The ground state electronic configuration of Mn is [Ar]3d ⁵ 4s ². When the neutral atom loses 4 electrons, the electronic configuration is [Ar]3d ³.
outer-shell d electrons = 3
Co(III):
The ion is Co³⁺, so it has lost 3 valence electrons. The ground state electronic configuration of Co is [Ar]3d ⁷4s ². When the neutral atom loses 3 electrons, the electronic configuration is [Ar]3d ⁶.
outer-shell d electrons = 6
Fe(II):
The ion is Fe²⁺, so it has lost 2 valence electrons. The ground state electronic configuration of Fe is [Ar]3d ⁶4s ². When the neutral atom loses 2 electrons, the electronic configuration is [Ar]3d ⁶.
outer-shell d electrons = 6
Ni(II):
The ion is Ni²⁺, so it has lost 2 valence electrons. The ground state electronic configuration of Ni is [Ar]3d ⁸4s ². When the neutral atom loses 2 electrons, the electronic configuration is [Ar]3d ⁸.
outer-shell d electrons = 8
The d electron in the outer shell of each of the transition metal are:
Mn(IV): 3 d electrons in the outer shell.
Co(III): 6 d electrons.
Fe(II): 6 d electrons.
Ni(II): 8 d electrons.
What is electronic configuration?Electronic configuration is the arrangement of the electrons of an atom.
There are subshell s, p, d, f.
The electrons are arranged in these subshells.
Each element has different arrangement of electrons.
Thus, the number of d electron in each of the element is: Mn(IV) :3, Co(III) :6, Fe(II) :6, Ni(II) :8.
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The highpoint of a wave is called a
Answer:
crest
Explanation:
Peat, which is formed when decayed moss is compressed over time, is used for which purpose?
A.Medicine
B.Shampoo
C.Fuel
D.Makeup
(PLEASE HURRY IM GETTING TIMED)
Answer:
answer is c or fuel
Explanation:
What is the total number of electrons in a S2- jon?
1.
10
2.
14
16
4.
18
the answer is D) 18 electrons
A student who is feeling cold rapidly rubs their hands on their bare arms. What energy transformation is the student using to feel warmer?
A.
mechanical ---> thermal
B.
radiant ---> thermal
C.
thermal ---> chemical
D.
electrical ---> thermal
Answer:
B
Explanation:
Answer:
B.
radiant ---> thermal
Explanation:
why the Modern dry process is preferred to another conventional process?
How do scientists define temperature
Answer:
Scientists define temperature with certain rules like the measure of the ability of a substance, or more generally of any physical system, to transfer heat energy to another physical system. The temperature of a substance is closely related to the average kinetic energy of its molecules.
Explanation:
Scientists define temperature as a measure of the average kinetic energy of the particles in a substance. In simpler terms, it reflects how fast the particles are moving within a material.
When an object is heated, its particles gain kinetic energy, leading to an increase in temperature. On the other hand, cooling reduces the average kinetic energy and results in a decrease in temperature.
Temperature is typically measured using various scales, such as Celsius, Fahrenheit, and Kelvin. Kelvin is the most commonly used scale in scientific applications since it is an absolute temperature scale, starting from absolute zero, where particles have minimal kinetic energy.
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How many moles of H2O are needed to produce 6.3 moles of H2
Answer:
H2 to O2
H2 to H2O
H20 to O2
H2O to H2
O2 to H20
O2 to H2
Explanation: