Answer:
C
Explanation:
Just took the test
A chemist prepares a solution of potassium iodide (KI) by measuring out 88. umol of potassium iodide into a 200. mL volumetric flask and filling the flask to
the mark with water.
Calculate the concentration in mol/L of the chemist's potassium iodide solution. Round your answer to 2 significant digits.
Please Help me!
The concentration in mol/L of the chemist's potassium iodide solution : = 4.4 x 10⁻⁴ M
Further explanationGiven
88. μmol of Potassium iodide
200. mL volumetric flask
Required
The concentration
Solution
Molarity is a way to express the concentration of the solution
Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution
[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]
Conversion :
88. μmol = 88 . 10⁺⁶ mol = 8.8 10⁻⁵ mol
200 ml = 0.2 L
The molarity :
= n : V
= 8.8.10⁻⁵ : 0.2
= 4.4 x 10⁻⁴ M
A reaction gives off 35.6 kJ how many calories is this?
What is both found in the outer core and mantle of the earth
Answer:
the Mantle
Explanation:
Answer:
Molten lava
Explanation:
I'm learning the same thing :)
Why can water dissolve many substances
Answer:
a substance that can dissolve other molecules and compounds, which are known as solutesBecause of its ability to form hydrogen bonds, , meaning that it can dissolve many different kinds of molecules.
Explanation:
Calcula la masa atómica del Hierro y las partículas subatómicas de cada uno de sus isótopos. Fe-54 (5.82%), Fe-56 (91.66%), Fe-57 (2.19%) y Fe-58 (0.33%).
Answer:
La masa atómica del hierro es 55.847 gramos por mol.
Explanation:
Las masas molares de [tex]Fe_{54}[/tex], [tex]Fe_{56}[/tex], [tex]Fe_{57}[/tex] y [tex]Fe_{58}[/tex] son 53.940 gramos por mol, 55.935 gramos por mol, 56.935 gramos por mol y 57.933 gramos por mol, respectivamente. La masa atómica del hierro se determina mediante el siguiente promedio ponderado:
[tex]M_{Fe} = \frac{5.82}{100}\times \left(53.940\,\frac{g}{mol} \right)+\frac{91.66}{100}\times (55.935\,\frac{g}{mol})+\frac{2.19}{100}\times \left(56.935\,\frac{g}{mol} \right)+\frac{0.33}{100}\times \left(57.933\,\frac{g}{mol} \right)[/tex]
[tex]M_{Fe} = 55.847\,\frac{g}{mol}[/tex]
La masa atómica del hierro es 55.847 gramos por mol.
limestone CaCo3 decomposes into lime according to the equation below
CaCo3 = CaO + CO2
(i) Balance the chemical equation above
(ii)what mass of limestone would produce 11.2 grams of lime?
Show your working
Answer:
Mass = 19.0 g
Explanation:
Given data:
Mass of limestone react = ?
Mass of lime produced = 11.2 g
Solution:
Balanced chemical equation:
CaCO₃ → CaO + CO₂
Number of moles of lime:
Number of moles = mass / molar mass
Molar mass of lime 56.1 g/mol
Number of moles = 11.2 g/ 56.1 g/mol
Number of moles = 0.19 mol
Now we will compare the moles of CaO and CaCO₃
CaO : CaCO₃
1 : 1
0.19 : 0.19
Mass of limestone react:
Mass = number of moles × molar mass
Mass = 0.19 mol × 100.1 g/mol
Mass = 19.0 g
due fan 22 at 2.30pm
10
This is a traded discussion 100 points possible
Rules Governing Electron Configurations
List and describe in your own words and in grammatically correct sentences, the rules that gover the manner in which electrons fill the energy levels around the nucleus of an atom, Explain
why there are exceptions to these rules and provide at least one example,
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10:56 AM
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Answer:
im not sure but i do know you have to look under 5.2
Explanation:
Radars can help meteorologists detect clouds and sailors detect submarines. Radars send out radio waves and record their echoes after the radio waves reflect off an object. Two radars send out radio waves
with the same frequency. The first radar sends radio waves through the air. The second radar sends radio waves through the ocean. What is true about these radio waves?
Answer:
D
Explanation:
Same Wavelength. Also cause i did the test
Answer:
They have the same wavelenght
Explanation:
What is the mass of 4.98 x 10^24 atoms of Zn?
Answer:he
H
Explanation:
541 grams is the mass of [tex]4.98\times 10^{24}[/tex] atoms of Zn.
Explanation:
Given
The number of zinc atoms =[tex]4.98\times 10^{24}[/tex]
To find:
The mass of given atoms of zinc atoms
Solution:
The number of zinc atoms =N=[tex]4.98\times 10^{24}[/tex]
According to mole concept:
1 mole = Avogadro 's Number = [tex]N_A= 6.022\times 10^{23} atoms/ molecules/ions[/tex]
Let the moles of zinc be = n
Number of atoms in n moles of zinc will be:
[tex]N=n \times N_A\\4.98\times 10^{24} atoms= n\times 6.022\times 10^{23} atoms\\n=\frac{4.98\times 10^{24} atoms}{ 6.022\times 10^{23} atoms}=8.27[/tex]
Moles of zinc = 8.27 mol
Molar mass of zinc = 65.38 g/mol
Mass of 8.27 moles of zinc:
[tex]=8.27\times 65.38 g/mol=540.67 g\approx 541 g[/tex]
541 grams is the mass of [tex]4.98\times 10^{24}[/tex] atoms of Zn.
Learn more about the mole concept here:
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Please help, I need to turn this in.
8. Mary, the mouse, was hiding in the rocks when she saw a sandwich hit the ground at
the park. Being she was hungry, she decided to run to the sandwich, which was 30 feet
away. It took her 5 seconds to get to the sandwich. What was her average speed?
What is the concentration of Iodine I2 molecules in a solution containing 2.54 g of iodine 250 cm3 of solution? A 0.01mol/dm3 B 0.02mol/dm3 C 0.04mol/dm3 D 0.08mol/dm3
Answer:
C. 0.04 moles per cubic decimeter.
Explanation:
The molar mass of the Iodine is 253.809 grams per mole and a cubic decimeter equals 1000 cubic centimeters. The concentration of Iodine ([tex]c[/tex]), measured in moles per cubic decimeter, can be determined by the following formula:
[tex]c = \frac{m}{M\cdot V}[/tex] (1)
Where:
[tex]m[/tex] - Mass of iodine, measured in grams.
[tex]M[/tex] - Molar mass of iodine, measured in grams per mol.
[tex]V[/tex] - Volume of solution, measured in cubic decimeters.
If we know that [tex]m = 2.54\,g[/tex], [tex]M = 253.809\,\frac{g}{mol}[/tex] and [tex]V = 0.25\,dm^{3}[/tex], then the concentration of iodine in a solution is:
[tex]c = \frac{2.54\,g}{\left(253.809\,\frac{g}{mol} \right)\cdot (0.25\,dm^{3})}[/tex]
[tex]c = 0.04\,\frac{mol}{dm^{3}}[/tex]
Hence, the correct answer is C.
The equation for photosynthesis is shown below .
Water + carbon dioxide > Glucose + Oxygen
Which compound contains the energy from the sun as a result of this process ?
Answer:
Glucose
Explanation:
Photosynthesis is the process of the transformation of the light energy from the Sun into stored chemical energy that can serves as the major source of energy in the food chain
The overall chemical equation for photosynthesis reaction can be presented as follows;
6CO₂(g) + 12H₂O(l) + Light Energy → C₆H₁₂O₆ + 6O₂ + 6H₂O
During cellular respiration, the energy in the glucose, C₆H₁₂O₆, is converted to energy stored in Adenosine Triphosphate (ATP) molecules which are released when the the ATP is converted into Adenosine Diphosphate (ADP)
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy containing ATP
The products of the reaction CaF2 + Br2 → CaBr2 + F2 are formed by reacting calcium fluoride with bromine. If equal moles of each reactant were present, what would be the limiting reactant?
Answer:
there is no limiting reactant.
Explanation:
Given that:
CaF₂ + Br₂ -----> CaBr₂ + F₂
From the above equation;
We can see that there is an equal number of moles in the reactant side of the equation.
i.e.
one mole of CaF₂ reacts with one mole of Br₂.
Thus, there is no limiting reactant.
There will be no limiting reactants as the chemical equation has the reactant totally consumed and thus leading to no reactants.
We can see that there's an identical range of moles withinside the reactant aspect of the equation
CaF2 + Br2 → CaBr2 + F2 From the above equation;one mole of CaF2 reacts with one mole of Br2.What is reactant ?It is the substance that gets into the chemical reaction.
Thus, there's no proscribing reactant.
To learn more about the bromine refer to link :
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14. Aluminum reacts with a certain unknown element (element X) to form the following formula. Which group must element X belong to? *
Answer:
c
Explanation:
Please explain your reasoning and give explanation of why you chose that answer
Answer:
a. Cellular Respiration produces more ATP than Anaerobic Respiration.
Explanation:
Cellular Respiration creates a total of 36-38 ATP per round. Anaerobic processes only produce 2 ATP per cycle.
(Immediate) Which structural formula represents a nonpolar molecule?
H-Cl
H-O
|
H
H-H
H-N-H
|
H
Answer: H-H
Explanation: it’s symmetrical on both sides
The structural formula of the nonpolar molecule is H-H. Therefore, option (3) is correct.
What is a nonpolar molecule?A molecule that does not have the charges present at the end as the electrons are finely distributed and symmetrically cancels out each other is a non-polar molecule. A polar molecule cannot be mixed with a non-polar molecule in a solution.
Water is a polar molecule that does not mix with oil as it is a non-polar molecule. Non-polar molecules have a net dipole moment of zero as the dipoles of the atoms are canceled out within the molecule.
Non-polar bonds have formed because the difference in the electronegativities of atoms is less than 0.5. Non-polar bonds do not are generally formed in compounds where there is a presence of symmetry.
The HCl has differences in the electronegativities of hydrogen and chlorine atoms. Therefore, HCl is a polar molecule. Ammonia is also a polar molecule due to the difference in the electronegativities H and N.
Therefore, the Hydrogen molecule (H-H) is a nonpolar molecule as the electronegativity difference is zero.
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what is happening to a reaction at equilibrium.
Answer:
A reaction at equilibrium implies that the concentration/amount of reactants & products present in that reaction don't change but will remain constant. It could also mean that the forward reactions and reverse reactions will occur at the same rates.
Explanation:
A reaction at equilibrium implies that the concentration/amount of reactants & products present in that reaction don't change but will remain constant. It could also mean that the forward reactions and reverse reactions will occur at the same rates.
giving brainlyest to whoever completes my question
Answer:
What question?
Explanation:
Answer:
how u doing good?
<(^-^)>
helloooo
Which is an important function of lipids in the body?
provide the body with energy and fiber
provide the body with vitamins and bile salts
provide the building blocks for muscle tissue
provide control of substances going into and out of cells
Answer:
One of the main functions lipids do is storing energy.
provide the building blocks for muscle tissue
Answer:
c
Explanation:
edge
19.
Look at the following chemical equation.
NaBr + Cl2 → 2NaCl + Br2
Is this a balanced chemical equation?
A. Yes, because the mass of the reactants is equal to the mass of the products.
В.
No, because the mass of the reactants is less than the mass of the products.
C.
No, because the reactants contain fewer molecules than the products.
D
Yes, because the reactants contain the same number of chlorine (CI) atoms as the products.
Answer:
В. No, because the mass of the reactants is less than the mass of the products.
Explanation:
Chemical equation:
NaBr + Cl₂ → 2NaCl + Br₂
The given equation is not balanced because number of moles of sodium and bromine atoms are less on reactant side while more on the product side.
There are one mole of sodium and one mole of bromine atom on left side of equation while on right side there are 2 moles of bromine and 2 moles of sodium atom are present. The number of moles of chlorine atoms are balanced.
Balanced chemical equation:
2NaBr + Cl₂ → 2NaCl + Br₂
Now equation is balanced. Number of moles of sodium , chlorine and bromine atoms are equal on both side.
Zns (zinc sulfide) (Zn = 65.38; S = 32.06] *
The question is incomplete, the complete question is;
Zinc and sulfur react to form zinc sulfide by the equation shown below. How many grams of ZnS can be formed when 12.0 g of Zn reacts with 6.50 g of S? (Atomic mass: Zn = 65.38, S = 32.06).
Answer:
17.5 g of ZNS
Explanation:
The equation of the reaction is;
Zn(s) + S(s) ------->ZnS(s)
Number of moles of Zn = 12.0/65.38 = 0.18 moles
Number of moles of S = 6.50/32.06 = 0.20 moles
Hence Zn is the limiting reactant
If 1 mole of Zn yields 1 mole of ZnS
Then 0.18 moles of Zn also yields 0.18 moles of ZnS
Mass of ZnS produced = 0.18 moles * 97.44 g/mol = 17.5 g of ZNS
Answer:
17.5 g of ZNS
Explanation:
cal the vol of carbon(ii)oxide produced at stp by. d dehydration of 6.00g of methanoic acid with concentrated H2SO4 (carbon =2oxygen=16 hydrogen=1 molar volume = 22.4dmcube pleeeeeeeeese I really need it a lot
The volume of CO= 2.912 L
Further explanationGiven
Dehydration of 6 g of methanoic acid with H2SO4
Required
The volume of CO
Solution
Reaction
HCOOH ⇒ CO+H₂O
MW = 1.Ar C+2.Ar H+2.Ar O
MW = 1.12+2.1+2.16
MW= 46 g/mol
mol = mass : MW
mol = 6 g : 46 g/mol
mol = 0.13
From equation, mol ratio HCOOH : CO, so mol CO = 0.13
Vm = 22.4 L
so for 0.13 mol :
= 0.13 x 22.4 L
= 2.912 L
Palladium acts as a catalyst for the synthesis of carbon dioxide from carbon monoxide and molecular oxygen. Which equation below represents this reaction?
Answer:
[tex]C+O_2\ \overrightarrow{Pd} \ CO_2[/tex]
Explanation:
Hello!
In this case, since the catalytic reactions involve the presence of a catalyst that decrease the activation energy of the undergoing chemical reaction, when we need to include it in the chemical equation, we usually put on or underneath the reaction arrow, just as shown below:
[tex]C+O_2\ \overrightarrow{Pd} \ CO_2[/tex]
Best regards!
PLEASE HELP ME ASAP!!!!!
Answer:
ok ,
Explanation:
.
An orbital is a region in an atom where there is a high probability of finding
Answer: Electron
Explanation:
An orbital is a region in an atom where there is a high probability of finding an electron.
PLEASE HELP THIS IS THE LAST DAY AND IM FAILING!! PICTURE PROVIDED!! In this lab, what did the pennies represent? (im sorry if the words are small on the paper it makes me crop it so i had to put my camera farther away)
Answer:
The pennies represent the particles of the isotope either decaying, or staying the same after each shake. This is a random process.
In this lab, the pennies represent the nuclei of radioactive substances
What are radioactive substances?Radioactive substances are the unstable substances as they ahve unstable nuclei and will attain stability after the decay of nuclei in the form of emission of alpha, beta or gamma rays.
In the given lab report, the word pennies is used to represent the nuclei of radioactive substances which undergo radioactive decay or remain same.
Hence pennies is used to represent radioactive substances.
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What pressure is exerted by 0.625 moles of a gas in a 45.4 L container at -24.0 °C? Find pressure in units of atm.
Answer:
Ok to solve this you will need to use the Ideal Gas Law Formula which is as follows:
PV = nRT
P= pressure
V= volume
n= # of moles
R= Universal Gas Constant (0.0821 L x atm/mol x K)
T= Kelvin temperature
1.Simplify the Ideal Gas Law formula to what you need to solve for:
P = (nRT)/ V
2. List all you components as follows (this makes the process easier):
P = ?
V = 45.4 L
n = 0.625 mol
R = 0.0821 L x atm/ mol x K
T = 249 K
To find the Kelvin temperature K = C + 273
3. Plug in all your components in your set up formula:
P = [(0.625 mol)(0.0821 L x atm/ mol x K)(249 K)] / (45.4 L)
4. Cross out all similar units so the only thing left is atm because you are trying to find pressure.
P = [(0.625)(0.0821atm)(249)] / (45.4)
5. Multiply through and simplify
P = 0.28 atm
B. is the correct answer.
Glad I could help!! If you have any other questions just message me. Hopefully this was helpful.
Explanation:
The velocity of an object must include both speed and direction?
Answer:
An object could be traveling at a constant speed, but change directions
Explanation:
Hope that helps
is solid iron pallets that are melted and drawn into wires is that chemical reaction
Answer:
It is not true that this is an example of a chemical reaction. This is a typical example of physical reaction.
Most physical changes are often phase changes.
A phase change is a change in the physical state of a body.
In this change, it is from solid to liquid.
Now new substances are formed.
When substances are changed from one form to another, it is a physical change.
In a chemical change, a new substance is formed at the end of the process.
Explanation:
yess of course
if you study the steps of melting the iron and makes the ores pure, you will know that there's many reaction happen to convert to wires
