Answer:
d. 12.3 grams of Al2O3
Explanation:
Based on the reaction:
4Al + 3O2 → 2Al2O3
Where 4 moles of Al reacts in excess of oxygen to produce 2 moles of aluminium oxide.
To solve this question we must find the moles of Aluminium. With these moles we can find the moles of aluminium oxide using the reaction:
Moles Al -Molar mass: 26.9815g/mol-
6.50g * (1mol / 26.9815g) = 0.241 moles Al
Mass Al₂O₃ -Molar mass: 101.96g/mol-
0.241 moles Al * (2 mol Al2O3 / 4 mol Al) = 0.120 moles Al2O3
0.120 moles Al2O3 * (101.96g / mol) =
12.3g of Al2O3 are produced.
Right answer is:
d. 12.3 grams of Al2O3Help please
If you have 100 grams of a radioactive isotope with a half-life of 10 years:
Part A How much of the isotope will you have left after 10 years?
Part B. How much of the isotope will you have left after 20 years?
Part C. How many half-lives will occur in 40 years?
fill in the chart
Answer:
Time >> Amount 0 100 g10 100 g / 2 = 50 g20 50 g / 2 = 25 g30 25 g / 2 = 12.5 g40 12.5 g / 2 = 6.25 gWhat is the concentration, in M, of a KBr solution that contains 0.0688 moles of
KBr dissolved in 0.250 liters?
2.75 M
3.63 M
1.78 M
0.275 M
Answer:
2.75M
Explanation:
Concentration(M)= mol/volume
0.0688mol/0.250L
=0.2752M
Calculate the pH of the solution, given the following (H+). Then identify the
solution as acidic, basic, or neutral. [H+]=7.94x10^-5 *
4.1; basic
0 6.9; basic
04.1; acidic
Answer: 4.1 Acidic
Explanation:
pH = -log(H+)
= -log (7.94x10^-5)
= 4.10017949757
= 4.1
any pH under 7 is acidic
1. How is energy transported from where it is generated to homes?
2. How is some energy lost as it is transmitted and how can this be minimized?
Plz answer fast its worth 30 points
Answer:
1. (put in simpler words so no one knows you got it off of brainly)
The electricity that flows to our homes is generated in power stations. From here, it flows through large transmission lines, which carry it to substations. Finally, distribution lines carry electricity from substations to houses, businesses, and schools.
2. (put in simpler words so no one knows you got it off of brainly)
The transmission over long distances creates power losses. The major part of the energy losses comes from Joule effect in transformers and power lines. The energy is lost as heat in the conductors. This can be minimized by
answer choice 1: reducing technical losses including: replacing incorrectly sized transformers, improving the connection quality of conductors (power lines), and increasing the availability of reactive power by installing capacitor banks along transmission lines.
answer choice 2: (just in case answer choice 1 isn't what you're looking for)
You can reduce losses in your home by spreading out your electricity use evenly throughout the day, instead of running all your appliances at once.
Explanation:
hope this helped <3
!!!PLEASE HELP!!!
Circle the element in each of the following pairs with the greater atomic size:
a) lithium or boron
b) magnesium or strontium
c) cesium or lead
d) sodium or argon
indica lo que harías en el laboratorio para preparar: 100 mL de una disolución al 2% V/V de etanol.
Answer:
Explanation:
Mide 2mL de etanol, añadelo a un matraz aforado, pon agua hasta llegar a 100mL
4) What is the order of the energy pyramid.?
what type of intermolecular forces does ammonium lauryl sulfate have?
Answer:
Ammonium lauryl sulfate, like any other surfactant, makes a good base for cleansers because of the way it disrupts the hydrogen bonding in water. Hydrogen bonding is the primary contributor to the high surface tension of water. In hydrogen bonding with the water surrounding them.
How many molecules of ammonia would there be in 40.0 grams of ammonia?
1.42x10^24 molecules
40.0 grams NH3 (6.02x10^23/17.0 grams NH3)= 1.42x10^24 molecules
Today is Earth day. What is one thing that you can do at school or at home to help protect our home, planet Earth?
Fractional distillation is used to separated
A, an insoluble substance from a soluble volatile substance
B. substances which are adsorbed differently, and which differ in their solubility in a solvent
c. liquids with differing boiling points
D gas, liquid or solid impurities from a mixture
Answer: Fractional distillation is used to separate liquids with differing boiling points
Explanation:
Sublimation is used to separate volatile substance from a non volatile substance where volatile substance gets converted from solid to gas.
Fractional distillation is separation of a liquid mixture into fractions which differ in boiling points by means of distillation by use of a fractionating column.
Chromatography is a separation method where different rates of adsortion of different components is used to separate substances.
how many mol are there if there are 3 mol of KNO3?
Answer:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles KNO3, or 101.1032 grams.
A student measures out 5 mL of calcium chloride solution into a small container and 5 mL of sodium carbonate solution in another small container. The total mass of both chemicals and the containers they are in is 15.5 g. When the student combined the two clear liquids, a gooey, cloudy precipitate formed. What would the total mass of the products and the two containers be after this reaction took place?
Group of answer choices
15.2 g
15.5 g
31.5 g
Answer:
15.5g
Explanation:
your welcome
Help would be majorly appreciated
Answer:
a) the atomic number is 15
b) the mass number is 15+16 = 31
c) element is phosphorus
d)Group 15 period 3
Describe the conversion of light energy in a blackberry plant.
Answer:
Anthocyanins are used in organic solar cells because of their strong light harvesting, and their ability to convert this light energy into electrical energy.
Explanation:
Solar panels plug you into the sun by absorbing solar energy with photovoltaic (PV) cells. When hit with sunlight, they generate electricity which then flows into a device called an inverter which converts the electricity into a form (120 volts, 60Hz) for household use.
which Scientific discovery resulted in the solid atom theory
being adapted into the Plum Pudding model of the atom?
Answer:
After discovering the electron in 1897, J J Thomson proposed that the atom looked like a plum pudding . To explain the two types of static electricity, he suggested that the atom consisted of positive 'dough' with a lot of negative electrons stuck in it.
help me please id appreciate it
Answer:
Thats the periodic table of elements
Explanation:
The rate law, rate constant, and reactant concentrations for the reaction of nitrogen dioxide with oxygen are given. What is the rate of the reaction under these conditions?
R = k[NO]2[O2], k = 7,000 M-2 • s-1
[NO] = 0.040 M, [O2] = 0.060 M
A. R = 7,000 M-2 • s-1
B. R = 16.8 s-1
C. R = 0.672 M • s-1
D. R = 0.040 M2 • s-1
Answer:
Its C.
.
.
.
.
.
.
.
.
.
.
Answer:
Person above is correct
The answer is C
Explanation:
When sand is mixed with water, it forms:
Answer:
Heterogeneous mixture.
(The composition is not uniform.)
What is the freezing point of water if 15.0 g of NaCl is dissolved
in 100. g of water? (Kf of water = 1.86 K-kg/mol)
a
255 K
b 263 K
C273 K
d 268K
e 277 K
Answer:
263
Explanation:
What is the density of an object with the mass of 204 grams? It displaces 17ml of water. please help!
Answer:
12 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
We have
[tex]density = \frac{204}{17} \\ = 12[/tex]
We have the final answer as
12 g/mLHope this helps you
1. Place these unknown pH test papers in order from most acidic to most alkaline.
B
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14
pH color chart
A. Paper D, paper C, paper B, paper A
B. Paper B, paper A, paper C, paper D
CPaper C. paper D paper A, paper B
D. Paper D paper o paper A, paper B
Answer:
D. Paper D, paper C, paper A, paper B
Explanation:
Please check the attached image for a diagram showing clearly the pH colour chart
pH measures how acidic or alkaline a solution is. The pH scale ranges from 1 - 14
Solutions with a pH less than 7 are acidic
Solutions with a pH equal to 7 are neutral
In the image, test papers D and C occur on the left, thus, they are acidic
Solutions with a pH greater than 7 are alkaline
pH test papers are used to test to test how acidic or alkaline a solution is
How many mols of H2SO4 is in 0.80 L of 1.40 M H2SO4?
What are the half-reactions for a galvanic cell with aluminum and gold electrodes?
A. A3+ (aq) + 3e > Al(s) and Au+(aq) + e* → Au(s)
B. Al(s) → A13+(aq) + 3e and Aut(aq) + e
Au(s)
C. AB+(aq) + 3e – Al(s) and Au(s) — Au (aq) + e
D. Al(s) → AB+(aq) + 3e and Au(s) → Au(aq) + e
Answer:B is right
Explanation: Al loses electrons and is oxidised, Au gains electron. And is reduced
To solve such this we must know the concept of half cell reaction. Therefore, the correct option is option B that is Al(s) → A1³⁺(aq) + 3e and Au(aq) + e [tex]\rightarrow[/tex]Au(s)
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
Oxidation is loss of electrons and reduction is gain of electrons. The electron transfer from oxidant to reductant. Al loses electrons and is oxidized, Au gains electron. And is reduced.
Therefore, the correct option is option B that is Al(s) → A1³⁺(aq) + 3e and Au(aq) + e [tex]\rightarrow[/tex]Au(s)
Learn more about the chemical reactions, here:
brainly.com/question/3461108
#SPJ2
butane is a saturated hydrocarbon
Because they have aromas, compounds with a ring of resonance bonds are called –
A) fragrent compounds
B) pungent molecules
C) aromatic compounds
D) scented structures
Please helppp and no linkss
Answer:
C I'm pretty sure
Explanation:
uhhhhhhhhh yes
Which of the following is true of oxygen?
A. Oxygen is an element because its most basic unit is a single type of atom.
B. Oxygen is a compound because its most basic unit is a single type of atom.
C. Oxygen is a mixture because its most basic unit contains more than one particle.
D. Oxygen is a compound because its most basic unit contains more than one type of particle.
Answer:
A. Oxygen is an element because its most basic unit is a single type of atom.
Explanation:
Oxygen is the chemical element with the symbol O and atomic number 8.
Consider the reaction
2 NO2 (g) <=> N2O4
If the equilibrium concentration of both NO2 and N2O4 are 0.2 M, what is the value of Kc?
A. 0.2
B. 0.3
C. 0.225
D. 5.0
E. 2.5
Please help.
Answer:
D. 5.0
Explanation:
Step 1: Write the balanced equation at equilibrium
2 NO₂(g) ⇄ N₂O₄(g)
Step 2: Calculate the concentration equilibrium constant
The concentration equilibrium constant (Kc) is equal to the product of the concentrations of the products raised to their stoichiometric coefficients divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients.
Kc = [N₂O₄]/[NO₂]² = 0.2 / 0.2² = 5
A boulder sits at rest on top of a mountain. What conclusion can be made about the forces acting on the boulder
Explanation:
Since, the boulder is at rest. This means that there is an equilibrium of forces acting on the boulder.
According to principle of equilibrium of forces a body can be in position of rest only when net force acting on body is zero for translation equilibrium and net moment acting on the body must also be zero for rotational equilibrium.
Therefore, net forces and net moment acting on the boulder is zero.
What is the difference between voluntary and involuntary muscles?
A. Voluntary muscles are striated and tire easily; involuntary muscles are not striated and do not tire easily.
B. Voluntary muscles can be almost anywhere; involuntary muscles are found only in the heart.
C. Voluntary muscles are under your conscious control; involuntary muscles are not.
D. Voluntary muscles are all skeletal muscles; involuntary muscles are cardiac muscles.