The dull coating, or tarnish, on an aluminum lawn chair is produced by a
redox reaction between aluminum and oxygen. What occurs during this
reaction?
A. A double-replacement reaction takes place.
B. The reaction is a single-replacement reaction.
O C. Aluminum atoms lose electrons to oxygen atoms.
D. Aluminum atoms gain electrons from oxygen atoms.
Answers
Option C. Aluminum atoms lose electrons to oxygen atoms.
Answer:
C. Aluminum atoms lose electrons to oxygen atoms.
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Related Questions
Based on the table above, which amount of a compound dissolved in 100 grams of water at the stated temperature represents a system at equilibrium?
Select one:
a. 40 g NaCl at 70 degrees Celsius
b. 20 g KClO3 at 70 degrees Celsius
c. 80 g NaNO3at 10 degrees Celsius
d. 80 g Pb(NO3)2 at 30 degrees Celsius
Answers
Answer:
C. 80g Nano3 at 10 degrees Celsius
Explanation:
I just took the test
80 g NaNO₃ at 10 degrees Celsius of a compound dissolved in 100 grams of water at the stated temperature represents a system at equilibrium. Therefore, option C is correct.
What is solubility ?The maximum quantity of a chemical that will dissolve in a given amount of solvent at a particular temperature is referred to as its solubility.
Different compounds have very varying solubilities, which is a feature of a particular solute-solvent pair.
A substance's physical and chemical characteristics affect how soluble it is. A few other factors and circumstances can also influence it. A few of these are: temperature, pressure, kind of binding, and forces between the particles.
A system is said to be in equilibrium when 80 grammes of a substance, dissolved in 100 grams of water at 10 degrees Celsius.
Thus, option C is correct.
To learn more about the solubility, follow the link;
https://brainly.com/question/28170449
#SPJ2
This image models…
diffraction
reflection
refraction
absorption
Answers
Answer:
reflection is correct answer by my views
Which type of plate boundary is associated with seafloor spreading at the source of the spread: convergent, divergent, or transform?
Answers
Answer:
The answer is divergent
A violent disturbance in the atmosphere is a
eye of hurricane
surge
front
storm
Answers
Answer: Storm surge
Explanation:
In order to produce CO2, a student put a sample of calcium carbonate in a flask and added hydrochloric acid using the following equation: Ca(CO3) + HCl → H2O + CO2 + CaCl2 The student finds the mass of CO2 generated to be 100 g. If the student began with 200 g of HCl and there was ample CaCO3 left unreacted, what was the percent yield?
Answers
Answer:
82.9% Is the percent yield
Explanation:
First, we need to balance the equation.
Ca(CO3) + 2HCl → H2O + CO2 + CaCl2
Since the problem tells you that the excess reactant is Ca(CO3), we just need to Stoichiometry to solve for the theoretical yield.
[tex]\frac{200g HCl}{1}[/tex] x [tex]\frac{1 mole HCl}{36.46gHCl}[/tex] x [tex]\frac{1 mol CO2}{2molHCl}[/tex] x [tex]\frac{44.01CO2}{1molCO2}[/tex] =120.707 g (theoretical yield)
Take your actual yield of 100g, divide that by 120.707, then multiply that decimical by 100.
Organisms with traits best suited to their environment, survive during what process?
A. environmental change
B. natural selection
C. populations
D. theories
Answers
Answer: According to Charles Darwin's theory of evolution by natural selection, organisms that possess heritable traits that enable them to better adapt to their environment compared with other members of their species will be more likely to survive, reproduce, and pass more of their genes on to the next generation.
Plants cannot grow too close together because their Blank______ need to spread out and absorb nutrients from the soil.
Answers
their roots need room to spread out
when gas changes to liquid is it gaining or loosing energy?
Answers
Answer:
Loosing energy
Explanation:
As the particles movement in gas slows down further when it is cooled
How many atoms of cobalt are in 4 moles of cobalt?
Answers
2 × 10²⁴ atoms Co
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
4 mol Co (Cobalt)
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 4 \ mol \ Co(\frac{6.022 \cdot 10^{23} \ atoms \ Co}{1 \ mol \ Co})[/tex]Multiply/Divide: [tex]\displaystyle 2.4088 \cdot 10^{24} \ atoms \ Co[/tex]Step 4: Check
Follow sig fig rules and round. We are given 1 sig fig.
2.4088 × 10²⁴ atoms Co ≈ 2 × 10²⁴ atoms Co
What is the SI unit of time?
A.
second
B.
minute
C.
hour
D. day
Answers
Answer:
option a. second
.............
Thomas sits half way down a grassy slope. What force stopped him slamming down
Answers
A person riding a bike has a mass of 55kg. They are moving with a velocity of 2m/s. What is the Kinetic Energy of the person?
Answers
So, if we take half of 55, we get 27.5
Next, we take 2, and square it, getting 4.
Lastly, take 27.5, and multiply it by 4, getting 110 Joules, hope this helps and have a great day!
Explanation:
Formula : ½ × mv² (mass×velocity)
½ × 55 × 2²= ½×55×4=110J
(½ is also equivalent to 0.5)
J = Joules
If a radioactive source has a half life of 2 hours how long will it take for the activity to go from 200 to 25?
Answers
Answer:
It takes 6h to the radioactive source decrease its activity from 200 to 25
Explanation:
The equation that describes the readioactive decay is:
Ln [A] = -kt + Ln [A]₀
Where [A] could be taken as activity of the source after time t, [A]₀ is initial activity and k is decay constant.
Decay constant could be written as:
k = ln2 / Half-life
k = ln 2 / 2h
k = 0.3466h⁻¹
Replacing in decay equation:
Ln [25] = -0.3466h⁻¹t + Ln [200]
-2.0794 = -0.3466h⁻¹t
6h = t
It takes 6h to the radioactive source decrease its activity from 200 to 25
Some seawater is evaporated. The sea salt obtained is found
to be 86% sodium chloride. How much sodium chloride
could be obtained from 200 g of this salt?
Answers
Answer:
the answer is 172g
Explanation:
200 × 0.86 = 172g
A student says that since the atomic theory is just a theory, it should not be considered useful. Which
statement best argues against the student's opinion? (2 points)
O Scientific theories change over time.
O Scientists often do not agree about specific details of scientific theories.
O Scientists often propose competing theories.
O Scientific theories do not become Scientific Laws.
O Scientific theories are the results of many experiments and observations.
Answers
Answer:
O Scientific theories are the results of many experiments and observations.
Explanation:
Going through the options;
O Scientific theories change over time.
This is true and supports the student's opinion. So wrong option!
O Scientists often do not agree about specific details of scientific theories.
This is true. However, it supports the student's opinion. So wrong option!
O Scientists often propose competing theories.
This is true. However, it supports the student's opinion. So wrong option!
O Scientific theories do not become Scientific Laws.
This is False. Theories that have withstood the test of time and countless experiments become laws. However it support's the student's opinion. So wrong option!
O Scientific theories are the results of many experiments and observations.
This is true and is against the student's opinion. This option is correct!
How many grams are in 0.75 moles of Fe
Answers
Answer:
41.88375 g Fe
Explanation:
Using stoichiometry, we can do this problem. First, we put our given. Then we create an equation using the molar mass of Fe (found on the periodic table, which was 55.845 g Fe), and the resulting equation is:
[tex]0.75 mol Fe * \frac{55.845 g Fe}{1 mol Fe}[/tex]
The mol Fe's cancel, and leave us with:
41.88375 g Fe
Good luck.
Can someone please help
Answers
Answer:
Water is the answer
Explanation:
Question 19 Multiple Choice Worth 3 points)
(06.04 MC)
What forensic scientist established the 'Body Farm' to study the ways bodies decompose under different circumstances?
Matheiu Orfila
Sir Edward Henry
Phillipe Locard
Bill Bass
Answers
Answer:
The answer is D Bill Bass
Explanation:
Remember it from the lesson and I took the test.
What season is it in earths northern hemisphere when earths northern hemisphere tilts toward the sun
Answers
Answer:
Summer
Explanation:
Earth's tilted axis causes the seasons. Throughout the year, different parts of Earth receive the Sun's most direct rays. So, when the North Pole tilts toward the Sun, it's summer in the Northern Hemisphere. And when the South Pole tilts toward the Sun, it's winter in the Northern Hemisphere.
Hope it helped!! Please mark as Brainliest!
Answer:
Summer took the test and got it right
Explanation:
Which season will the northern hemisphere experience when the axis of Earth is tilted towards the sun?
Summer
What coefficient should go in front of the hydrogen peroxide (H2O2 ) molecule to make the chemical equation balanced? ___ H2O2 ➞ 2 H2O + O2
Answers
Answer:
2
Explanation:
H2O2 ➞ 2 H2O + O2
The reaction is currently not balanced because the number of atoms on the reactant side is not equal to that of the product side
Hydrogen
Reactant = 2 Product = 4
Oxygen
Reactant = 2 Product = 4
Adding 2 to H2O2 balances the reaction as the number of atoms of both elements are now balanced on both sides of the equation
2H2O2 ➞ 2 H2O + O2
Ammonia (NH3) reacts with oxygen (O2) to produce water and nitric oxide (NO). How many grams of water are produced when 22.5 grams of oxygen are reacted?
Answers
A typical tincture of iodine contains about 2.0% iodine by mass. Calculate
the mass of iodine in a 500. g tincture.
Answers
Reason: Ask Siri
What are two properties that make a metal a good choice to use a wire in electronics? *
Answers
Answer:
Explanation:
The two properties that make a metal a good choice to use a wire in electronics are :
ductility conductivityWhich characteristic is true of sexual reproduction but not of asexual reproduction?
Answers
Answer:
j one or more parents. that's the answer
6) The following questions refer to F2 and Cl2.
a. Draw the molecular model (space-filling or ball-and-stick) that would
provide the best means for comparing the differences in bond length and
bond energy.
b. Which structure has the longest bond length? Justify your answer.
c. Which bond has the greatest bond energy? Justify your answer.
d. Which structure has the least potential energy associated with its bond?
Justify your answer.
Answers
Answer:
chill
Explanation:
How does water pressure relate to depth?
Answers
Explain why is ortho nitrophenol more acidic than ortho methoxyphenol
Answers
Answer:
Ortho nitrophenol is more acidic than ortho-methoxyphenol.
Reason:
This is because the nitro-group is an electron-withdrawing group. In the case of ortho methoxyphenol; methoxy group is an electron-releasing group. Thus, it increases the electron density in the O−H bond and hence, the proton cannot be given out easily.
Hope this helps you. Do mark me as brainliest.
What do plants need in order to make food?
A. water, energy, oxygen
B.carbon dioxide, energy, oxygen
C.water, energy, carbon dioxide
D.water, oxygen, carbon dioxide
Answers
Answer:
Water, solar energy, carbon dioxide
Explanation:
anyone know this? i’m having trouble...please help.
Answers
Why because the last two are wrong there is no way they are common when they have different genes the first one is wrong too so the second
A cup of coffee is made in the morning by pouring water ov er ground up coffee beans in a piece of paper and by collecting the brown liquid that comes through. Which techniques used
Answers
Answer: Filtration technique
Explanation:
The technique used here is called filtration.
Filtration,is a physical separation process that separates a mixture of an insoluble solid from a liquid ( acting as the solvent) by the use of a filter barrier that allows only the fluid to pass through.
In the case from the question,
As water is poured over the ground coffee, it forms a mixture of which the insoluble solid is the coffee grounds, the water is the liquid and the filter barrier is the piece of paper which allows only the brown liquid coffee to pass through as the filtrate.