Answer:
car hornsss
Explanation:
they loud asl
What is the phase label on H3O+?
Answer:
I think it’s aq but your choice.
Explanation:
Which of the following correctly describes what happens to the kinetic energy of water when it changes from the liquic
state to the solid state?
• There is no change in the kinetic energy of the molecules.
O The kinetic of energy of the molecules increases.
• The kinetic energy of the molecules increases then decreases.
of O The kinetic energy of the molecules decreases.
Answer:
The kinetic energy decreases
Explanation:
When water freezes, it is losing heat. Heat and energy are interchangeable, meaning it loses energy.
Answer:
The kinetic energy of the molecules decreases.
Explanation:
because when temperature decreases the average kinetic energy of the gas molecules decreases as well.
Why is the r.a.m. value used?
A. The r.a.m. value is used to determine how many isotopes an element has.
B. None of these
C. Atoms are too small for their masses to be measured directly.
D. A single atom cannot be isolated, so only the average size of a group of atoms can be measured.
Answer:
I think the answer is going to be d A single atom cannot be isolated, so only the average size of a group of atoms can be measured. :)
Have an amazing day!!
Please rate and mark brainliest!!
Answer: A. The r.a.m. value is used to determine how many isotopes an element has.
Explanation: Founders Educere Answer
I love you fellow summer school students, good luck.
Please rate and mark brainliest!!
13. Subtract 0.291 from 0.4
I need a breakdown of the answer?
-0.109 is the answer :)
You could basically just do column subtraction
2. A 0.2719 g sample containing CaCO3 reacted with 20.00 mL of 0.2254 M HCl. Given that HCI was excess. The excess HCl required exactly 20.00 mL of 0.1041 M NaOH to reach the end-point using phenolphthalein indicator. Determine percentage purity of CaCO3 in the sample. The reraction involved is CaCO3(s) + 2HCl(aq) → CaCl₂(aq) + 2H₂O(l) The titration reaction is HC(aq) + NaOH(aq) NaCl(aq) + H₂O(1)
The percentage purity of the calcium carbonate is 44%. The percentage purity gives the amount of pure CaCO3 in the sample.
What is excess titration?In excess titration or back titration, we neutralize the excess titrand left in a system.
We have the reaction;
CaCO3 + 2HCl ----> CaCl2 + H2O + CO2
Number of moles of HCl = 0.2254 M * 20/1000 L = 0.0045 moles
The reaction of the excess acid is according to the reaction;
HCl + NaOH ----> NaCl + H2O
Number of moles of NaOH = 0.1041 M * 20/1000 = 0.0021 moles
Since the reaction is 1:1, 0.0021 moles of HCl reacted also
Number of moles of HCl that reacted with CaCO3 = 0.0045 moles - 0.0021 moles = 0.0024 moles
If 2 moles of HCl reacts with 1 mole of CaCO3
0.0024 moles of HCl reacts with 0.0024 moles * 1/2
= 0.0012 moles
Mass of pure CaCO3 present = 0.0012 moles * 100 g/mol = 0.12g
Percent purity of the sample = 0.12g/0.2719 g * 100/1
= 44%
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Aqueous lead (II) nitrate, Pb(NO3)2 undergoes a double displacement reaction with aqueous sodium chloride, NaCl, in which a precipitate forms. If the precipitate contains lead, write the balanced chemical equation for this reaction. Be sure to include the states of each of the reactants and products.
Answer:
Explanation:
Pb(NO3)2(aq) + 2NaCl(aq) ==> PbCl2(s) + 2NaNO3(aq)
NO3- mixes with everything at beginning levels.
PbCl2 doesn't mix at all in water. It becomes a ppte, which means it is solid form. Your teacher might prefer using PbCl2(ppte). I think I'd ask to make sure.
When potassium and chlorine form a chemical compound, the atoms
a. become less stable, and covalent bonds are
formed
b. become more stable, and covalent bonds are
formed
c. become less stable, and ionic bonds are
formed
d. become more stable, and ionic bonds are
formed
Answer:
D
Explanation:
Potassium metal and chlorine gas combine to form potassium chloride. The balanced equation is 2K (s) + Cl2 (g)→2KCl (s) There are two chlorine atoms on the left-hand side (LHS) and one chlorine atom on the right-hand side (RHS).
The motion of gas particles is described by straight line motion, followed by a collision and a change in direction. This is know as
Answer:
It is called the Random Walk, where the next move (as seen through the motion of gas particles) depends on chance.
Explanation:
How can Climate Change impact the formation of Hurricanes?
I will give brainlist
The first excited state of Ca is reached by absorption of 422.7 nm light. Find the energy difference (kJ/mole) between the ground and first excited state. Watch your units. A. 2.83 x 10-7 B. 4.70 x 10-22 C. 283 D. 4.70 x 10-19 E. 457
For the excited state of Ca at the absorption of 422.7 nm light,the energy difference is mathematically given as
E= 4.70x10-22 kJ/mol
What is the energy difference (kJ/mole) between the ground and the first excited state?Generally, the equation for the Energy is mathematically given as
E = nhc / λ
Where
h= plank's constant
h= 6.625x 10-34 Js
c = speed of light
c= 3x 108 m/s
Therefore
E = 1*(6.625x 10-34 Js)( 3x 10^8 m/s) / ( 422.7x10^-9)
E= 4.70x10-22 kJ/mol
In conclusion, Energy
E= 4.70x10-22 kJ/mol
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Mass of 1.5 mole electron is
Mass of 1.5 mole of electron is 0.8229 mg
mass of electron = 9.11 * 10^-31 kg
mass of 1 mole of any substance ( Avagadro number ) = 6.022 * 10^23 /mol
1.5 moles of electron = 1.5 * 6.022 * 10^23 = 9.033 * 10^23 /mol
mass of 1.5 mole of electron = 9.033 * 10^23 * 9.11 * 10^-31
mass of 1.5 mole of electron = 8.229 * 10^-7 kg
mass of 1.5 mole of electron = 8.229 * 10^-4 g
mass of 1.5 mole of electron = 0.8229 mg
Hope it helps.....
When the color changes is it a chemical change or a physical change
physical
It can be chemical but it's usually physical as the molecular structure doesn't change
. Define the term Flame?
Answer:
A hot glowing body of ignited gas that is generated by something on fire.
12.Put this equation into word form.
Rb + P + Rb3P
rubidium and phosphorus react to form rubidium phosphide
rubidium and potassium react to form rubidium potasside
rubidium plus potassium forms rubidium potasside
rubidium combined with potassium forms rubidium phosphide
Answer:
A. Rubidium and phosphorus react to form rubidium phosphide
Explanation:
P is not potassuim. It is phosporous. So A is the only correct choice.
Moles to mass
HELP PLEASE
15 pts
Explanation:
nose amigo, la verdad yo también tengo dificultades escolares muchísimas gracias, Dios te bendiga en otro idioma por cierto mi anime favorito es cowboy beboop
Predict: How do you think you could use the Gizmo to make the color gray? _____________
_________________________________________________________________________
Observe: Change the Red, Green, and Blue values to 90. What color does this produce?
_________________________________________________________________________
The simplest way to make the color gray is by mixing white and black colors, but it can also be created by mixing colors such as red and green.
What is the grey color?This is considered a neutral and cool color that can be naturally found in elements such as rocks.
How can you make this color by mixing other colors?Neutral gray: The eeasiest way to create this color is by mixing black and white. This would give you a very neutral gray.Other shades: It is also possible to make this color by mixing colors that are opposite in the colors scale such as:Yellow and purples.Red and green.This would not be a neutral gray as it will resemble a little bit the original colors.
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A sample 0.5 mole sample of NO2 gas occupies a 0.620 L container at 25 °C. What is the pressure of this gas?
The pressure of the sample of the gas in the container at 25 °C occupying 0.62 L is 19.73 atm
Data obtained from the question Volume (V) = 0.62 L Temperature (T) = 25 °C = 25 + 273 = 298 KGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) = 0.5 mole Pressure (P) = ?Using the ideal gas equation, the pressure of the gas can be obtained as follow:
PV = nRT
Divide both side by V
P = nRT / V
P = (0.5 × 0.0821 × 298) / 0.62
P = 19.73 atm
Thus, the pressure of the gas is 19.73 atm
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A 50g of ethanol alcohol is cooled. if the amount of heat released is 4880 J, find the change in temperature if the specific heat of ethanol is 2.44 J/g.K?
Answer:
∆ in temperature= 40K
Explanation:
H = mc∆€
m= 50g
c = 2.44 J/g.K
∆€= ?
H= 4880
∆€= 4880/(50×2.44)
∆€= 40K
What must happen for a nuclear reactor to make electricity
Answer:
They contain and control nuclear chain reactions that produce heat through a physical process called fission. That heat is used to make steam that spins a turbine to create electricity
Explanation:
if the concentration of H+ ions in a solution is 3.16 x 10^-4 mol/L then what is the concentration of OH- ions
Answer:
10-4mol/l
[H+]=10-7 , which we call a pH of 7.
This means, for example, that a hydrogen-ion concentration of a solution with a pH of 4 is 10-4mol/l, meaning it contains 0.0001 mol of hydrogen ions in a solution of 1 liter.
Explanation:
3.12×10⁻¹⁰M is the concentration of OH⁻ ions. Concentration in chemistry refers to the quantity of a material in a certain area.
What is concentration?
Concentration in chemistry refers to the quantity of a material in a certain area. The ratio of the solvent in the solution to the solvent or whole solution is another way to define concentration. In order to express concentration, mass every unit volume is typically used. The solute concentration can, however, alternatively be stated in moles or volumetric units.
If a formula describing a shape's boundary is known, it is possible to use integral calculus to determine the volumes of more complex shapes. No object in the dimensions of zero, one, or two has volume; in the dimensions of four and above, the hypervolume is a concept similar to the standard volume.
[H⁺] [OH⁻] = 10 ⁻¹⁴
3.16 x 10⁻⁴ × [OH⁻] = 10 ⁻¹⁴
[OH⁻] = 3.12×10⁻¹⁰M
Therefore, 3.12×10⁻¹⁰M is the concentration of OH⁻ ions.
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Which is stronger, the C=O bond in an ester (1735 cm–1) or the C=O bond in a saturated ketone (1715 cm–1)? Explain
1) Complete the equation triangles or write out the equation. Annotate them with the units for each value.
(a) The equation linking frequency, wave speed and wavelength (Vampires Frighten Waves)
Help me pls
A) wave speed = frequency x wave length
B) Time period = 1/frequency
C) Power = work done/ time taken
D) Kinetic energy = 0.5 x mass x velocity^2
E) Ep = mass x gravitational field x height
F) Ee = 0.5 x spring constant x extension^2
Hope this helps!
What mass, in grams, of sodium sulfate is needed to make 230.5 g of a 3.5 % (m/m) aqueous solution of sodium sulfate?
The percent concentration of a solution can be calculated from; mass of solute /mass of solution * 100. The mass of the solute here is 8.1 g.
What is concentration?The term concentration refers to the amount of solute presnt in a solution. There are many ways of expressing concentration such as molarity, molality and percentage.
Here;
mass of solution = 230.5 g
Percent of solute = 3.5 %
3.5 = x/ 230.5 * 100
3.5 = 100x/230.5
230.5(3.5) = 100x
x = 230.5(3.5) /100
x = 8.1 g
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100.0 grams of water at 4.0°C is heated until its temperature is 37°C. If the specific heat of water is 4.18 J/g°C, calculate the amount of heat energy needed to cause this rise in temperature.
The amount of heat energy needed to cause the rise in temperature of the water initially at 4 degreess Celsius is 13,794 J.
Heat required to raise the temperature of the water
The quantity of heat required to raise the temperature of the water is calculated as follows;
Q = mcΔθ
where;
m is mass of the waterc is heat capacityΔθ is change in temperatureQ = 100 x 4.18 x (37 - 4)
Q = 13,794 J
Thus, the amount of heat energy needed to cause the rise in temperature of the water initially at 4 degreess Celsius is 13,794 J.
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Which of the following states is NOT true with regards to the expansion of slavery into the western territories?
1The Wilmot Proviso aimed at prohibiting slavery in any territory that would be won from Mexico. It was not passed by Congress, but it wc
territories for the next fifteen years.
2The idea of letting white settlers decide if the territories they moved to would be free or slave was known as popular sovereignty.
3The whig candidate for president in 1848, war hero Zachary Taylor, had no party affiliation and had never himself voted in a presidential ele
4 The Free Soil party, which
nominated former president Martin Van Burn in 1848, wanted to abolish slavery in the USA, to make the countr
Answer:
what I don't understand anymore JJ is the best thing I think it's help with that I hope it's a pako I will be there in about a
How many kilograms are present in 6.78x1025molecules of Al2(SO4)3? (hint 1kg=103g)
Atomic masses:
Al = 27
S = 32
O = 16
A) 0.891kg
B) 38.5kg
C) Cannot be determined
D) 8.44kg
mol = 6.78 x 10²⁵ : 6.02 x 10²³ = 112.62
MM Al₂(SO₄)₃ = 2.27 + 3.32+12.16 =342 g/mol
mass = 112.62 x 342 = 38516.04 g = 38.5 kg
The total mass of 6.78*[tex]10^{25}[/tex] molecules of [tex]Al_{2}(SO_{4})^3[/tex] is (b) 38.5 Kg.
To calculate the mass, we need to first understand the values given in the question:1 mole of [tex]Al_{2}(SO_{4})^3[/tex] contains 6.02*[tex]10^{23}[/tex] molecules6.78*[tex]10^{25}[/tex]/6.02*[tex]10^{23}[/tex] moles are in the given amount of [tex]Al_{2}(SO_{4})^3\\[/tex]112.62 moles of [tex]Al_{2}(SO_{4})^3[/tex] is availableWeight of 1 mole [tex]Al_{2}(SO_{4})^3[/tex] is 342 gramsHence, weight of 112.62 moles of [tex]Al_{2}(SO_{4})^3[/tex] = 112.62*342 gramsThe total mass is equal to 38516.04 grams, which is equal to 38.5 Kg.Hence, the total weight of 6.78*[tex]10^{25}[/tex] molecules of [tex]Al_{2}(SO_{4})^3[/tex] is (b) 38.5 Kg.
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5. Which equation represents a balanced chemical equation?
O CF4 + 2Br2 → CBr4 + 2F2
O N2 + 3F2 + NF3
OPA+ O2 + 2P203
O K+ Cl2 + 2KCI
Answer:
Cf4 + 2Br2 gives CBr4 +2F2
Explanation:
b/c there are balanced
If a bottle of nail polish remover contains 174 mL of acetone, how much heat would be released by its complete combustion? The density of acetone is 0.788 g/mL .
Answer:
liberates 1790 kJ of heat.
Explanation:
What is the mass of 3.011 x 1023 atoms of Ca ?
Answer:
2g is the answer
Explanation:
based on google
Which of the following sets of quantum numbers (n, l, ml, ms) cannot occur within an atom of gallium?
A. 4, 0, 0, ½
b. 4, 2, 1, ½
c. 4, 1, 1, ½
d. 4, 1, 2, ½
e. 4, 3,1, 1/2
The following sets of quantum numbers ( n, I, ml, ms ) that cannot occur within an atom of gallium are :
4, 2, 1, ½ ( B ) 4, 1, 2, ½ ( D ) 4, 3,1, 1/2 ( E )Determine the sets of quantum numbers that cannot occur within an atom of gallium
Given that
Ga ( 31 ) = 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p¹
[ 4r ] 3d¹⁰ 4s²4p¹
where : n = principal quantum numbers, l = azimuthal quantum numbers, ml = magnetic quantum numbers, ms = spin quantum numbers.
For option B
Given that 4d shell is absent for Gallium the set cannot occur within the atom of Gallium
For Option D and E
All quantum number cannot occur here because the value of l = 2 for option D while for option E the value of l = 3
Hence we can conclude that sets of quantum numbers ( n, I, ml, ms ) that cannot occur within an atom of gallium are as listed above.
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