11
Cr2O3 + 2Al → 2Cr + Al2O3
Chromium is produced by reacting its oxide with aluminum. If 76 g of Cr2O, and 27 g of Al completely react to form 51 g of Al2O3. how many grams of Cr are formed?
Answer:
Deci trebuie sa te aplici cu 2 din3 pe suprafata pamanyului chinez
Explanation:
Deci 1287+2086+2762+7:5
what does the period number on the periodic table tell us?
Answer:
The period number on the Periodic table tells you the total number of orbits that the atom will have. In other words, the period number indicates the number of energy levels (or energy orbit) of an atom. For example, 1st period indicates that these elements possess 1 energy shell (or energy orbit).
Explanation:
what is:
Na2O+SO2 =
for chemistry
Na2SO3 – Sodium sulfite
What is formed when 2 non metals reacts?
A) covalent bond
B) ionic bond
C) molecular bond
Answer:
A) covalent bond
Explanation:
Covalent bonding generally happens between nonmetals.
Give an example of a metal and a nonmetal you use in everyday life.
Answer:
A type of metal I use everyday in life in using the iron door knob on my doors.
A nonmetal I use everyday is chlorine for when I need to clean my pool.
Explanation:
Is this your intention?
In which type of chemical reaction would two reactants join together and form one product
Answer:
Synthesis Reaction
Explanation:
A synthesis reaction occurs when two or more reactants combine to form a single product. In a decomposition reaction, one reactant breaks down into two or more products. This is the reverse of a synthesis reaction. Replacement reactions occur when elements switch places in compounds.
In the Caribbean countries, general election is usually held every _ years
it is held every 4-5 years
Which best completes the analogy?
B Cells : Produce Antibodies :: T Cells : ___________________
A. Get rid of good cells that have been infected
B. Tell B cells to start making antibodies
C. Tell killer cells to attack
D. remember antigens that have attacked the body
Answer:
d
Explanation:
d
Blank O2 + blank Mg arrow blank MgO
Select the coefficients that balance the equation:
MgO *
A) 1,1,1
B) 1,2,2
C) 2,3,4
D) 1,4, 2
Answer:
its a
Explanation:
a
What is the pressure of a car tire that had an initial pressure of 33.7 kPa but was
heated from 98.4°C to 110.°C?
Answer:
34752.6 Pa.
Explanation:
Applying,
P/T = P'/T'............... Equation 1
Where P = Initial Pressure, T = Initial Temperature, P' = Final pressure, T' = Final temperature.
make P' the subject of the equation
P' = (PT'/T).............. Equation 2
From the question,
Given: P = 33.7 kPa = 33700 Pa, T = 98.4°C = (273+98.4) = 371.4 K, T' = (110+273) = 383 K
Substitute these values into equation 2
P' = (33700×383)/371.4
P' = 34752.6 Pa.
5). At what temperature (K) will 0.854 moles of neon gas occupy 12.3 L at 1.95
atmospheres?
Answer:
338.38 K
Explanation:
Applying,
PV = nRT............... Equation 1
Where P = pressure, V = Volume, R = Temperature, n = number of moles, T = temperature.
Make T the subject of the equation,
T = PV/nR............. Equation 2
From the question,
Given: P = 1.95 atm, V = 12.3 L, n = 0.854 moles
Constant: R = 0.083 L.atm/K.mol
Substitute these values into equation 2
T = (1.95×12.3)/(0.854×0.083)
T = 338.38 K
How do you write balance equations Fe2 S3+O2-Fe2O3+SO2
Answer:
2Fe2 S3+6O2 → 2Fe2O3+3SO2
Explanation:
ILL MARK AS BRAINLESS PLS HELP
in figure 21-4b in what direction is the force defeating the wire
Answer:
the one that has more power to it
What volume of water is needed to make 5.41 M solution with 47.71 moles of HCL?
Answer:
0.113 liters
Explanation:
5.41 M / 47.71 moles = 0.113 liters
If 13 grams of copper sulfate is reacted with zinc how much of each product is produced?
Answer:
No. Of Moles of zinc = m/Ar
= 13/ 65.38 = 0.198 moles
From balanced equation, Mole ration between CuSO4 and Zn is 1 : 1
So only 0.198 moles of CuSO4 reacts, it is in excess
Mass = no of Moles X Mr
Mass = 0.198 X 159.5 = 31.59 grams
Volume = mass m denisty
Volume j 31.59 / 3.6 = 8.78 ml
Explanation:
i think this wrong
You are given 250 mL of a 12.0 M solution of KNO3. To obtain a 5.0 M, to what volume does the solution need to be diluted to?
600 ml
104.17 mL
0.24 mL
60 mL
Answer:
600 mL
Explanation:
molarity 1 * volume 1 = molarity 2 * volume 2. So this means 12 * 250 = 3000 and divide that by 5 to get 600 mL.
Which of the following statements about alkynes is incorrect?
Alkynes are unsaturated hydrocarbons.
Alkynes have triple bonds.
Alkynes are saturated hydrocarbons.
Alkynes have carbon atoms.
Answer:
Alkynes are saturated hydrocarbons
Explanation:
Alkynes are groups of hydrocarbons that have the general formula of {Cn H2n - 2}. They have a triple carbon to carbon bond (C≡C) in their structure. Ethyne (HC≡CH) is the first member of the alkyne series.
Alkynes like alkenes are unsaturated hydrocarbons because of their triple and double carbon bonds respectively. Unsaturated hydrocarbons do not have a complete hydrogen atom in their structural composition. Hence, the statement that "Alkynes are saturated hydrocarbons" is FALSE.
What is a state function?
What is the mass of disulfur pentoxide (S2O5)?
Answer: What is the mass of disulfur pentoxide (S2O5)?
Explanation:144.14g/mol
How many moles of nitrogen are in 12 grams
Answer:
Explanation:
The chemical formula of nitrogen is N2
A mol of Nitrogen atoms = 14 grams
So N2 will have a molar mass of 14 * 2 = 28 grams
number of moles of N2 = given mass / molar mass
number of moles of N2 = 12 / 28
number of moles of N2 = 0.4286 mols
how many atoms are in 4.5 moles of Al?
Explanation:
4.5×6.022×10²³
27.099×10²³
According to Avogadro's number, there are 27.10×10²³ atoms in 4.5 moles of Al.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number.As 1 mole =6.023×10²³ atoms , thus,4.5 moles =4.5×6.023×10²³ = 27.10×10²³ atoms.
Thus, there are 27.10×10²³ atoms in 4.5 moles of Al.
Learn more about Avogadro's number,here:
https://brainly.com/question/11907018
#SPJ2
Low-beam headlights must show objects _______ feet ahead.
Answer:
150 feet
Explanation:
What causes the process of transmutation?
O A. A gamma ray is emitted from an atom's nucleus.
B. Mass is lost due to the formation of a nucleus.
C. Quarks in the nucleus shift between particles.
D. The number of protons in the nucleus changes.
Answer: D. The number of protons in the nucleus changes.
Explanation:
Transmutation occurs due to a change in the number of protons in the nucleus as this will cause the element to either become another isotope of the same element or an entirely new element altogether.
There are two types of transmutation; Natural and Artificial. Natural transmutation happens as unstable elements such as Uranium-238 try to find stability. They decay until they become a stable element. Artificial transmutation happens when atoms are collided with particles that cause them to change.
Which of the following elements has the ability to undergo sublimation
iodine
oxygen
carbon sodium
Answer:
iodine
Explanation:
For many purposes, we can treat propane (C3H8) as an ideal gas at temperatures above its boiling point of -24C Suppose the temperature of a sample of propane gas is lowered from 14.0c to -1.0c and at the same time the pressure is changed.
If the initial pressure was0.75 kPa and the volume decreased by55.0% what is the final pressure? Round your answer to the correct number of significant digits.
it's 75 k bro thats the answer
How many particles in 352 moles of KLICO3?
O 106 particles
O 2.12 x 1026 particles
O 6.38 x 1025 particles
Answer:
there are 106 particles
Using the example of an ambulance, explain the Doppler Effect. Infer why the doppler effect can or cannot occur in all waves. PLEASE ANSWER ILL PICK BRAINLEIST TO THE FIRST ACTUAL ANSWER
Answer:
When the ambulance is coming towardss you the waves are smushed together and sound higher pitched but then it passes you and when tracveling away the waves are scretched out so the whee whoo sounds lower and that is because of the doppler effect
Some sugar is added to cold water in a beaker.
After some time, all the sugar dissolves and spreads throughout the water.
(a)(¡) Name the process that occurs which causes the sugar to spread throughout the water.
(ii) State two ways to make the sugar dissolve more quickly.
(b) Pure water can be obtained from the sugar solution using this apparatus.
Name the process used to obtain pure water from the sugar solution.
i) diffusion, concentration differences in gas and fluid disappears when particles of sugar are evenly spread in solution
ii) Heating the solution, mixing the solution
b) Distillation, solution is heated until water is vaporized and water vapour condenses in another part of apparatus.
Sugar is separated from water by evaporation of the sugar solution to dryness.
i) The process of that causes the sugar to spread throughout the water is called solvation. Solvation simply refers to the interaction of a solute and a solvent.
ii) To make the sugar to dissolve quicker;
The temperature of the solvent can be raisedThe system can be stirred periodicallyb)To obtain pure water from sugar, the sugar is evaporated to dryness. This is done by heating the sugar in a set up as shown in the image attached.
Learn more: https://brainly.com/question/14866314
please help! due soon!
Answer:
I think it's
there are the same number of molecules on each side of the equation, then a change of pressure makes no difference to the position of equilibrium