Answer:
Explanation:
Molecular weight of Al: 27
Molecular weight of O: 16
Percentage composition of Al by weight in Al2O3
= (27*2) / (27*2 + 16*3)
= 0.5294
In 200 grams of Al2O3, there are
= 200*0.5294
= 105.88 grams of Al
77.18 grams of Al was produced in the experiment.
Percent yield for the experiment
= product mass / reactant mass * 100%
= 77.18 / 105.88 * 100%
= 72.89%
what happens when magnesium is burnt in air?
It forms magnesium oxide by reacting with oxygen
The balanced equation is provided by
[tex]\\ \rm\hookrightarrow 2Mg+O_2=2MgO[/tex]
On both sides
Mg=2O=2Hence balanced
What does acetic anhydride form when it reacts with water?
What does acetic anhydride form when it reacts with water?
When acetic anhydride reacts with water it forms acetic acid. In other words, The hydrolysis of acetic anhydride in presence of water forms acetic acid.*Note that:- It is an exothermic reaction.
How much potassium iodide to take for radiation protection.
Age GroupKI DosageNumber of 65-mg tabletsAdults over 18 years130 mg2Over 12 - 18 years and over 150 pounds130 mg2Over 12 - 18 years and less than 150 pounds65 mg1Over 3 -12 years65 mg1
Explanation:
Chemistry students were testing compounds in an aqueous solution to see which one had the strongest electrical current. There are three beakers each with a different compound. The first beaker and the second beaker lit the light bulbs brightly. The third beaker did not light up the bulb. With the information that is provided, what is the best explanation for the first and second beaker being the strongest electrolytes?
A)The first and second beakers contain a solution that partially dissociates the ions. These ions create an electrical current. The third beaker solution completely dissociates the ions. It is a strong electrolyte.
B)The first and second beakers contain a solution that completely dissociates the ions. These ions create an electrical current. The third beaker solution does not dissociate ions. It is a nonelectrolyte.
C)The first and second beakers contain a solution that does not dissociate ions. These ions create an electrical current. The third beaker solution completely dissociates the ions. It is a strong electrolyte.
D)The first and second beakers contain a solution that completely dissociates the ions. These ions do not create an electrical current. The third beaker solution does completely dissociates the ions. It is a strong electrolyte.
Answer:
B)The first and second beakers contain a solution that completely dissociates the ions. These ions create an electrical current. The third beaker solution does not dissociate ions. It is a nonelectrolyte.
Explanation:
Electrolytes dissociate ions. They are also conductors. Since the first 2 bulbs light up strongly, we can assume that the ions completely dissociated. Since the 3rd did not light up, it is a nonelectrolyte.
Answer:
The first and second beakers contain a solution that completely dissociates the ions. These ions create an electrical current. The third beaker solution does not dissociate ions. It is a nonelectrolyte.
Explanation:
What are the ways that citizens can follow in order to save water? i need 5 point min please
Answer:
the ways that citizens can follow in order to save water are:
-If you wash dishes by hand, don't leave the water running for rinsing
-Check faucets and pipes for leaks
-Don't let the faucet run while you clean vegetables
-Use your automatic dishwasher for full loads only
-Take shorter showers
-Only run the washing machine and dishwasher when you have a full load.
ASAP...What cause-and-effect relationships are being suggested or predicted based on smaller-scale mechanisms in the systems described by the claims?
Answer:
Cause and effect relationships are routinely identified, tested, and used to explain change.
Explanation:
A volcano erupts and lava flows for 10 miles before slowly cooling into solid rock. Is this
change endothermic or exothermic? *
Endothermic because cold energy enters as the lava cools then forms a solid.
Exothermic because heat energy exits as the lava cools then forms a solid.
Endothermic because heat energy enters as the lava cools then forms a solid.
Exothermic because cold energy exits as the lava cools then forms a solid
Answer:
My Answer:
Explanation:
Exothermic because heat energy exits as the lava cools then forms a solid.
What is the equilibrium concentration
of C at 30°C for the gaseous reaction
A + B <-> 2C
if Kc = 4.0 and [Al]i = [B]i = 2.0 M ?
[?]M
Answer:
56
Explanation:
[tex]\\ \rm\Rrightarrow K_c=\dfrac{[Products]}{[Reactants]}[/tex]
Now
[tex]\\ \rm\Rrightarrow k_c=\dfrac{[C]^2}{[A]^1[B]^1}[/tex]
Put values
[C] be x[tex]\\ \rm\Rrightarrow 4=\dfrac{x^2}{2^2}[/tex]
[tex]\\ \rm\Rrightarrow x^2=4(4)[/tex]
[tex]\\ \rm\Rrightarrow x^2=4^2[/tex]
[tex]\\ \rm\Rrightarrow x=4.0M[/tex]
identify the importance of water. check all that apply
Answer
a c e f
Explanation:
HELP PLEASE!! 20 POINTSS
Explain the connection between atoms and electricity
Answer:
The protons and electrons of an atom are attracted to each other. They both carry an electrical charge. Protons have a positive charge (+) and electrons have a negative charge (-). The positive charge of the protons is equal to the negative charge of the electrons.
Explanation:
help me┐(´ー｀)┌thank you in advance
Answer:
the law of conservation of mass is valid for all the following, except nuclear reactions.
Explanation:
the law of conservation of mass is valid for all the following, except nuclear reactions because some mass gets converted to energy.
Answer:
Nuclear reactions
Explanation:
What's this law?
This law states that in any chemical reaction the mass is neither created nor destroyed ,it remains conservedASAP 20 POINTS!!!
You add 28 grams of carbon. You find the actual yield to be 181.2 grams of CO2. What is the percent yield of CO2?
A) 15.5%
B) 209.2%
C) 15.8%
D) 6435%
Answer: the answer is D
Explanation: u have to divide
what is ( H+) and (OH-) in a healthy person's blood that has a PH of 7.50 assume that the temperature of the blood is 298 K.
pH = - log [H⁺]
pH = 7.5
[tex]\tt [H^+]=10^{-7.5}=3.16\times 10^{-8}[/tex]
pH + pOH = 14
7.5 + pOH = 14
pOH = 6.5
[tex]\tt [OH^-]=10^{-6.5}=3.16\times 10^{-7}[/tex]
Which of these best describes frequency?
the number of vibrations per unit time
the loudness of a sound
the energy that bounces off an object
the bending of light as it passes through substances
==============================
[tex] \large \sf \underline{Question:}[/tex]
Which of these best describes frequency?
A. The number of vibrations per unit timeB. The loudness of a soundC. The energy that bounces off an objectD. The bending of light as it passes through substances==============================
[tex] \large \sf \underline{Answer:}[/tex]
[tex] \qquad \qquad \huge \bold{Option \: A}[/tex]
==============================
[tex] \large \sf \underline{Explanation:}[/tex]
The number of vibrations per unit time is called frequency.Additional Information: The other given choices best describes; Phon, Reflection, and Refraction.
==============================
What best describes the relationship between the frequency of an oscillation and the period of the oscillation?
brainly.com/question/13112321What best describes frequency?
brainly.com/question/4027382==============================
what are some orgenells in a plant
Answer:
Chloroplasts and mitochondria. Both organelles contain double membranes including characteristic internal membranes, called thylakoids in chloroplasts and cristae in mitochondria.
Answer: (1) nucleolus (2) nucleus (3) ribosome (4) vesicle (5) rough endoplasmic reticulum (6) Golgi apparatus (7) cytoskeleton (8) smooth endoplasmic reticulum (9) mitochondria (10) vacuole (11) cytosol (12) lysosome (13)
Explanation: hi
What are the Kelvin and Celsius temperature scales based on?.
Answer:
The Celsius scale sets the freezing point and boiling point of water at 0°C and 100°C respectively. The Kelvin scale is based on molecular motion, with the temperature of 0 K, also known as absolute zero, being the point where all molecular motion ceases.
Explanation:
Which of the following questions may be difficult to test scientifically?
A. What is the average flight speed of an African Swallow?
B. How was Hawaii formed?
C. Why is cheating wrong?
D. Is there evidence of water on other planets?
The question that may be difficult to test scientifically is Why is cheating wrong?
What is scientific experiment?An experiment is a procedure carried out to support or refute a hypothesis, or determine the efficacy or likelihood of something previously untried.
The following questions can be test scientifically.
What is the average flight speed of an African Swallow?How was Hawaii formed?Is there evidence of water on other planets?Thus, the question that may be difficult to test scientifically is Why is cheating wrong?
Learn more about scientific experiment here: https://brainly.com/question/17274244
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HURRY PLSS
What happens to the energy added during a phase change?
O A. It is used for the phase change.
B. It decreases the temperature.
C. It is converted to kinetic energy.
bai
D. It increases the temperature.
Answer:
A. It is used for the phase change.
How many moles of FeS2 are required to produce 32 g of So2
Answer:
So, the right answer is. No. of moles of FeS₂ = 0.25 mole. Explanation: From the balanced. 4 FeS2 + 11 O2 → 2 Fe2O3 + 8 SO2.
Explanation:
Witch is the best definition to describe a transfer of energy ?
Answer:
Energy transfer is the movement of energy from one place to another.
Explanation:
However, energy cannot be created or destroyed :)
help me please(｡+‿+｡)
4. Change in temperature (｡^‿^｡)
Ionic Bonds fill in the blanks
Answer:
In an ionic bond, metals lose valence electrons and become positively charged cations. Nonmetals gain valence electrons and become negatively charged anions.
YOU'RE WELCOME ^_^
which of the changes gas to solid gas to liquid, liquid to solid liquid to gas,solid to liquid solid to gas will involve an output and input of heat energy
Hurrryyyy
Answer:
Liquid to solid liquid to gas
Explanation:
Boiling a liquid result in a gas
Draw a particulate level drawing of a solid, a liquid, and a gas
How many moles of water can be produced if 8 moles h2 are used.
Answer:
10 moles for every 1 mile of oxygen
Explanation:
____ is harmful for crop soil in building
Answer:
Acid Rain
Explanation:
Because it was even the main reason for discoloration of Taj mahal over years.
Hope it was helpful !
What happens when a fatty acid is reacted with naoh.
When kerosene and oxygen molecules react to form carbon dioxide and water, energy is released. Where do you think the energy comes from?
The energy comes from the breaking of bonds that is present between kerosene molecules.
How energy released from kerosene?When fuels are burned, the chemical energy that is present in kerosene molecules. This energy can be used to generate other form of energy, such as heat, light, motion, or electricity so we can conclude that the energy comes from the breaking of bonds that is present between kerosene molecules.
Learn more about energy here: https://brainly.com/question/13881533
36.0 g of Be contains how many moles? 1 mole = Molar mass (grams)
Answer:
this is the result
Explanation:
36.0
BE=4
36.0÷4
= 9
