Answer:
Redox type
Explanation:
The reaction is:
2Cr + 3Fe(NO₃)₂ → 2Fe + 2Cr(NO₃)₃
2 moles of chromium can react to 3 moles of iron (II) nitrate in order to produce 2 moles of iron and 2 moles of chromium nitrate.
If we see oxidation state, we see that chromium changes from 0 to +3
Iron changed the oxidation state from +2 to 0
Remember that elements at ground state has 0, as oxidation state.
Iron is being reduced while chromium is oxidized. Then, the half reactions are:
Fe²⁺ + 2e⁻ ⇄ Fe (Reduction)
Cr ⇄ Cr³⁺ + 3e⁻ (Oxidation)
When an element is being reduced, while another is being oxidized, we are in prescence of a redox reaction.
b. What useful functions do oxidation numbers
serve?
20.
b. How many molecules are in 1 mole of
molecules?
c. What is the name given to the number of
molecules in 1 mole?
21. a. What is the molar mass of an element?
b. Write the molar mass rounded to two
decimal places of carbon, neon, iron and
uranium.
Explanation:
b. What useful functions do oxidation numbers serve?
It is used to show oxidation and reduction (loss and gain of electrons)
b. How many molecules are in 1 mole of molecules?
1 mole = 6.022 * 10^23 molecules
c. What is the name given to the number of molecules in 1 mole?
Avogadro's Number of molecules
21. a. What is the molar mass of an element?
This is the mass of an element divided by the number of moles.
Molar mass = Mass / Number of moles
b. Write the molar mass rounded to two decimal places of carbon, neon, iron and uranium.
amu = Atomic Mass Unit
Carbon = 12.01 amu
Neon = 20.18 amu
Iron = 55.85 amu
Uranium = 238.03 amu
How many significant digits are in this number?
742800
1.6
2.5
3.4
4.3
Calculate the number of grams of sulfur in 4.52 mol of sulfur.
Help me pretty please
Answer:
C
Explanation:
Answer:
I think ur answer would be C.)
Explanation:
hope this helps
Which of the following examples best describes an effect of urbanization?
A More land is available in large cities to grow crops.
B Wildlife diversity increases due to more open spaces within the city.
C Emissions from motor vehicles increase smog in the air that can block radiation.
D The greater concentration of people in large cities reduces overall waste production and accumulation on Earth.
please help
Emissions from motor vehicles increase smog in the air which can block radiation. Hence, option C is correct.
What does it mean to live in an urban area?An urban area is a region surrounding a city. Most inhabitants of urban areas have nonagricultural jobs. Urban areas are very developed, meaning there is a density of human structures such as houses, commercial buildings, roads, bridges, and railways. "Urban area" can refer to towns, cities, and suburbs.
Emission from motor vehicles increases smog in the air that can block radiation, which makes sense because urbanization means more people in one area=lots of pollution.
Hence, option C is correct.
Learn more about urbanization here:
brainly.com/question/12007420
#SPJ2
A reaction is expected to produce 28.3 moles of hydrogen gas. If the hydrogen is collected at 297 K and 1.08 atm, what is the volume? 305 L H2 639 L H2 948 L H2 1,240 L H2
Answer:
The correct answer is 639 L H₂
Explanation:
We use the ideal gas equation:
We have the following data:
n = 28.3 mol
T= 297 K
P= 1.08 atm
R= 0.082 L.atm/K.mol (gas constant)
We introduce the data in the gas equation to calculate the volume (V):
PV=nRT
⇒V =nRT/P = (28.3 mol x 0.082 L.atm/K.mol x 297 K)/(1.08 atm) = 638.2 L ≅ 639 L
Therefore, the correct option is 639 L H₂
Answer:
639 L H2
Explanation:
took the quiz
ur welcome
Na2SO4
How many oxygen stems are?
Answer:
Na2SO4 means: two moles sodium (45.98 g), one mole sulfur (32.06 g), and four moles oxygen (64.00 g) combine to form one mole of sodium sulfate (142.04 g).
Explanation:
Answer:
As we can see in the formulae, Na₂SO₄
We can see that 4 is the subscript of O and that means There are 4 atoms of oxygen.
Is the reaction above a replacement reaction? Explain.
If Steve throws a football 57 meters in 3 seconds, what is the average speed of the football?
Answer:
19 m/s
Explanation:
57/3
Question 1
1. Na2O + H20 --->
NaOH
A. Single Replacement
B. Double Replacement
c. Decomposition
D. Synthesis
E. Combustion
Answer: D. Synthesis
Explanation:
Sodium Oxide + Water = Sodium Hydroxide
if answered correctly i will give brainlest
Answer: Earthquake location
Explanation:
Answer:
Volcano chains and arcs, and earthquake locations
Which of the following best describes a solution?
a heterogenous compound
a homogenous compound
a homogenous mixture
O O a heterogenous mixture
Answer:
homogeneous mixture
need help to solve it
Answer:
Divide by the molar mass to get moles
Explanation:
The total mass of the __________________ and __________________ in an atom is the atomic mass.
Fill in the blanks Plzz
Answer:
protons, neutrons
Explanation:
There are three subatomic particles in all atoms: protons, neutrons and electrons. Of these three, only protons and neutrons are considered to have enough mass to contribute to overall atomic mass of the element.
What is the formula for the compound formed by Al3+ and N3- ?
Answer:
[tex]\boxed {\boxed {\sf AlN}}[/tex]
Explanation:
The goal when forming compounds is to achieve a net charge of 0.
We are given aluminum with a charge of 3+ and nitrogen with a charge of 3-.
These charges are equal and opposite, so one of each will equal 0.
3+ (Al) + 3- (N) = 0Therefore, we do not need any subscripts. List the metal's symbol (aluminum) then the nonmetal.
AlNTh formula for the compound, which is aluminum nitride, is AlN.
A brick measures 0.018 dam by 6.5 cm by 17.3 cm. What is the volume of the brick in cubic centimeters
Answer:
volume of brick= length × breadth × height
=0.000018 ×6.5×17.3
=
The mass of a single gold atom is 3.27X10^-22 grams. How many gold Adams with there be in 57.8 mg of gold.
Answer:
18 * 10^19 atoms
Explanation:
We must first convert 57.8 mg to grams.
If 1000 mg = 1g
57.8 mg = 57.8/1000 = 57.8 * 10^-3 g
Now;
If 1 gold atom has a mass of 3.27X10^-22 grams
x gold atoms have a mass of 57.8 * 10^-3 g
x = 57.8 * 10^-3 g/3.27X10^-22 g
x = 18 * 10^19 atoms
Calculate the number of moles that are in 2.0 L of a 0.75 M solutions of NaCl
Answer:
1.5
Explanation:
0.75M=Moles/2L
what happens to the boiling point of hydrocarbon compounds when the number of carbon atom increases
A. Decreases
B. Increases
C. Remains the same
D. None of these
I NEED YOUR ANSWER RN GUYSS PLEASEE
each side of a square is 8 by 10 metre find the area of the square
Answer and Explanation:
I believe the answer is 8
What are the
invisible lines
revealed by the
Iron fillings
surrounding a
magnet called?
Answer:
At each end of a magnet is a pole. These lines of flux (called a vector field) can not be seen by the naked eye, but they can be seen visually by using iron fillings sprinkled onto a sheet of paper or by using a small compass to trace them out.
hope it's help
#carryONlearningWhat 3 things will you do to dissolve a solid (salt) faster in a liquid (water)
Answer:
There are three ways to make solids dissolve faster: Break the solute into smaller pieces. Stir the mixture. * Heat the mixture.
Explanation:
Substances can dissolve in water three ways—by dissociation, dispersion, and ionization.
If a reaction is endothermic,
1 point
More energy is released when the bonds in the products are formed than is used to
break the bonds in the reactants
The temperature increases
The same amount of energy is used to break the bonds of the reactants as is released
when the bonds in the products are formed
О O
It takes more energy to break the bonds of the reactants than is released when the
bonds in the products are formed
Answer: It takes more energy to break the bonds of the reactants than is released when the bonds in the products are formed
Explanation:
Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat. Thus it takes more energy to break the bonds of the reactants than is released when the bonds in the products are formed
Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat. Thus More energy is released when the bonds in the products are formed than is used to break the bonds in the reactants
Which formula equation represents the burning of sulfur to produce sulfur dioxide?
Answer
The balanced reaction that describes the reaction between sulfur and oxygen to produce sulfur dioxide is expressed S(s) + O2 (g) = SO2 (g). In many manufacturing plants, sulfur dioxide is furhter reacted to oxygen to form sulfur trioxide then added with water to produce sulfuric acid.
Explanation: The balanced reaction that describes the reaction between sulfur and oxygen to produce sulfur dioxide is expressed S(s) + O2 (g) = SO2 (g).
Answer:
The balanced reaction that describes the reaction between sulfur and oxygen to produce sulfur dioxide is expressed S(s) + O2 (g) = SO2 (g). In many manufacturing plants, sulfur dioxide is further reacted to oxygen to form sulfur trioxide then added with water to produce sulfuric acid.
is lime flavor ionic or covalent
Answer:Calcium carbonate (CaCO3), essentially, is an ionic compound having the bivalent calcium and carbonate ions. But the carbonate anion is a polyatomic species. The carbon atom is bonded to all the three oxygen atoms by covalent bonds - two carbon-oxygen single bonds and one carbon-oxygen double bond.
Explanation:So it's ionic hope this helps u. Btw may i have brainlist plz.
How to make copper chloride from copper carbonate
Answer:
Describe how a sample of copper chloride crystals could be made from copper carbonate and dilute hydrochloric acid. Add excess copper carbonate to hydrochloric acid in a beaker, stirring until there is no further reaction. Filter the mixture to remove the remaining copper carbonate, then heat the remaining solution to the point of crystallisation.
Explanation: Hope this is right.
Will mark BRAINLIEST. Molarity
Please no Bs answers. Only going to be reported.
If water is added to 145 mL of a 0.55 M KOH solution until the volume is 250 mL, what will the molarity of the diluted solution be?
What is the molarity of the solution that results from diluting 35.0 ml of a 9.02M solution to a new volume of 45.0 ml?
We can use the equation for dilutions that relates concentration and volume:
[tex]M_1V_1=M_2V_2[/tex]
where M is the molarity, V is the volume, and 1 and 2 refer to the initial and final states of the solution, respectively. Here, we are given the molarity of the initial solution and the volumes of the initial and final (diluted) solutions. To find the final concentration (i.e., the molarity of the diluted solution), we would be solving for M₂:
[tex]M_2=\frac{M_1V_1}{V_2} = \frac{(0.55 \text{ M})(145 \text{ mL})}{250 \text{ mL}} \\ M_2 = 0.319 \approx 0.32 \text{ M}.[/tex]
The molarity is given to two significant figures as both our M₁ and V₂ are given to two significant figures.
Note: Although our volumes are in mL instead of L, we do not need to convert them to L for the purposes of our calculation since we would be multiplying our V₁ and V₂ by a common factor that would cancel out in division. All that matters is the ratio between the two volumes, which is the same whether the volumes are in mL or in L.
---
We follow the exact same procedure in the second question as we did in the first problem: solve for M₂ given M₁ = 9.02 M, V₁ = 35.0 mL, and V₂ = 45.0 mL:
[tex]M_2=\frac{M_1V_1}{V_2} = \frac{(9.02 \text{ M})(35.0 \text{ mL})}{45.0 \text{ mL}} \\ M_2 = 7.02 \text{ M}.[/tex]
A horse weighs 240 kg. If its running at a speed of 18 m/s, what's the linear momentum of the horse
Answer: The answer is 4320
Explanation:
I got the answer correct
How to convert celcius to Kelvin?
Answer:
temperature
Explanation:
which substance will evaporate first???????????????????
Answer:
I think it would be a liquid.
Explanation:
If the temperature hits a certain point, it will turn to ice. If the ice gets exposed to heat, it will melt and return back to it's natural form, a lqiuid. If the liquid is exposed to enough heat, it will evaporate. Not sure if this is right, but I tried my best!