Answer:
d. 12.3 grams of Al2O3
Explanation:
The balanced chemical equation of this chemical reaction is as follows:
4Al + 3O2 --> 2Al2O3
Based on the balanced equation, 4 moles of aluminum (limiting reagent) reacts to form 2 moles of aluminum oxide (Al2O3).
First, we need to convert the mass of aluminum to moles using the formula;
mole = mass/molar mass
Molar mass of Al = 27g/mol
mole = 6.50/27
= 0.241mol of Al.
Hence, if 4 moles of aluminum (limiting reagent) reacts to form 2 moles of aluminum oxide (Al2O3).
Then, 0.241mol of Al will produce (0.241 × 2/4) = 0.241/2 = 0.121mol of Al2O3.
Convert this mole value to molar mass using mole = mass/molar mass
Molar mass of Al2O3 = 27(2) + 16(3)
= 54 + 48
= 102g/mol
mass = molar mass × mole
mass = 102 × 0.121
mass of Al2O3 = 12.34grams.
This question is about equilibrium. Describe how a reaction reaches equilibrium.
Answer:
A reaction is at equilibrium when the amounts of reactants or products no longer change. Chemical equilibrium is a dynamic process, meaning the rate of formation of products by the forward reaction is equal to the rate at which the products re-form reactants by the reverse reaction.
Equilibrium is said to be reached when the rate of forward reaction is equal to the rate of reverse reaction.
What is equilibrium?In a chemical reaction, equilibrium is said to be reached when the rate of forward reaction is equal to the rate of reverse reaction. When that occurs, the system would come to a state in which the concentration of each of the species involved does not change.
Thus, equilibrium is said to be reached when the rate of forward reaction is equal to the rate of reverse reaction.
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.In a _____ relationship one variable increases and a second variable increases proportionally,
A. inverse relationship/inversely proportional
B. direct relationship/directly proportional
C. converse relationship/conversely proportional
Answer:
Explanation: b
Name the following alkane molecule (picture)
A.) 2-methyl-3-broom-5-ethyloctane
B.) 3-bromo-5-ethyl-2-methyloctane
C.) 3-bromo-5-ethyl-2,7-dimethylheptane
Answer: B. 3-bromo-5-ethyl-2-methyloctane
Explanation:
The correct name of the compound as we can see is 3-bromo-5-ethyl-2-methyloctane.
What is IUPAC nomenclature?The IUPAC nomeclature shows the standard,, approved pattern for naming organic compounds. As a matter of fact it is intended to enable pratitioners to write the name of a compound from structure.
The correct name of the compound as we can see is 3-bromo-5-ethyl-2-methyloctane.
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HELP!! ASSIGNMENT DUE TODAY! PLEASE HELP!!! I'LL GIVE 21 POINTS!!!!
Respiration occurs in the cytoplasm and _________ of cells.
mitochondria
im not 100% sure but it makes sense
2 Which two substances cause iron to rust?
Answer:
water and oxygen
Explanation:
this is because
iron + water + oxygen ----> hydrated iron (III) oxide (which is rust in lame terms )
hope this helps
please mark it brainliest
It was believed that Earth was a stationary object at the center of the universe. All other objects in space were thought
to go around Earth. Which of these is a criticism of this idea?
A)
Years on Earth are regular periods of three hundred sixty five days each
B)
Earth's shadow falling on the moon shows that Earth is actually spherical,
rather than flat
The moon goes around Earth, resulting in different phases of the moon
that can be seen from Earth
D
There are four seasons on Earth only because Earth is tilted at its axis and
it goes around the sun
Answer: A) years on Earth are regular periods of three hundred sixty five days each
The criticism of the given idea is that there are four seasons on Earth only because Earth is tilted at its axis and it goes around the sun.
What are seasons?A season is a division of the year based on changes in weather, ecology, and the number of daylight hours in a given region. On Earth, seasons are the result of the axial parallelism of Earth's tilted orbit around the Sun. In temperate and polar regions, the seasons are marked by changes in the intensity of sunlight that reaches the Earth's surface, variations of which may cause animals to undergo hibernation or to migrate, and plants to be dormant.
The Northern Hemisphere experiences most direct sunlight during May, June, and July, as the hemisphere faces the Sun. The same is true of the Southern Hemisphere in November, December, and January. It is Earth's axial tilt that causes the Sun to be higher in the sky during the summer months, which increases the solar flux.
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Calculate the concentration of the solution produced when 5.2g of potassium chloride is
dissolved in 200cm of water.
Answer: The concentration of solution is 0.35 M
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]
where,
n = moles of solute
[tex]V_s[/tex] = volume of solution in ml = 200
moles of [tex]KCl[/tex] = [tex]\frac{\text {given mass}}{\text {Molar mass}}=\frac{5.2g}{74.5g/mol}=0.070mol[/tex]
Now put all the given values in the formula of molality, we get
[tex]Molarity=\frac{0.070\times 1000}{200}[/tex]
[tex]Molarity=0.35M[/tex]
Therefore, the concentration of solution is 0.35 M
If the reaction was reversed and we wanted to produce as much NaN3, in grams, as possible from 30.0 g of N2 and 20.0 g of Na, which reactant would be the limiting reactant? (4 points) How much NaN3 would actually be produced?
Answer:
N₂
Explanation:
Sodium is a larger molecule with a much higher molecular weight. However, 20g of N₂ would be a smaller amount of molecules than 20g of sodium due to how there are multiple nitrogen molecules.
2/3 * given mass of N₂ = mass of N₃
N₃ (Azide ion) given mass = 20g
Na = 20g
Masses of chemicals are equal
Na = 22.990g/mol
20g/22.990g/mol = 0.8699mol of Na
N₃ = 20g
N₃ = N g/mol x 3
N = 14.007 g/mol
14.007 x 3 = 42.021 g/mol
N₃ = 42.021g/mol
20g/42.021g/mol = 0.4759 mol of N₃
Notice how there are fewer moles of the Azide ion than the Sodium.
0.4759 moles of NaN₃ is produced
combine molecular weights:
42.021 + 22.990 = 65.011 g/mol
multiply by amount of moles of the limiting reactant:
0.4759 mol *65.011 = 30.942 g
Also, here is the balanced equation:
3N₂ + 2Na = 2NaN₃
The results are the same as the balanced equation.
What does the big 2 in 2CO2 mean?
Answer:
Its a coefficient
Explanation:
It has double a normal CO2 has
If I contain 2.5 moles of gas in a container with a volume of 45 liters and at a temperature of 261 K, what is the pressure inside the container in atmospheres?
Answer:
The correct answer is "[tex]1.21\times 10^5 \ Pa[/tex]".
Explanation:
The given values are:
Number of moles,
n = 2.5 moles
Volume,
V = 45 liters
Temperature,
T = 261 K
As we know,
⇒ [tex]PV=nRT[/tex]
or,
⇒ [tex]P=\frac{nRT}{V}[/tex]
On substituting the values, we get
⇒ [tex]=\frac{2.5\times 0.0821\times 261}{45}[/tex]
⇒ [tex]=\frac{53.57}{45}[/tex]
⇒ [tex]=1.19 \ atm[/tex]
On converting it in Pa, we get
⇒ [tex]=1.19\times 1.01325\times 10^5[/tex]
⇒ [tex]=1.21\times 10^5 \ Pa[/tex]
A 4.2 M NaCl solution has 86.2 grams of NaCl dissolved in it. How many liters of solution will
this be?
Answer:
this is your answer (8358) answer
I think
which of these ions have the same number of electrons as s2-
A.CI- B.Ca2+ C.Na+ D.O2- E.P3-
Answer:
Cl-, O²‐, P³‐ have same number of electron i.e. 18
Rod cells work best in dim light and enable you to see black, white, and shades of gray.
true
or
not
Give the word and chemical equations (including state symbols) for the reaction of potassium and water
Zinc will displace copper from a solution of copper sulfate, and magnesium will displace zinc from a solution of zinc sulfate
a)Write full, balanced chemical equations for the two reactions using state symbols.
Answer:
Zinc is Zn and Magnesium is Mg
in ________ only one parent organism produces offspring
I believe the answer should be Asexual Reproduction.
7. Marcie fills a graduated cylinder with 15.0mL of water. Paul finds the mass of a marble to be
2.21g, then drops the marble into the graduated cylinder. If the meniscus on the cylinder is
now at 16.3mL, what is the density of the marble?
Answer:
1.7 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
volume = final volume of water - initial volume of water
volume = 16.3 - 15 = 1.3 mL
We have
[tex]density = \frac{2.21}{1.3} = 1.7 \\ [/tex]
We have the final answer as
1.7 g/mLHope this helps you
Who was one of the first scientists to realize the effects of CO2 in the atmosphere? where was it measured?
I give Brainliest! Please no links
calcium phosphide consists of two ions chemically bonded together what are the charges of each ion
A. ca^2- and p^3+
B. Ca^3- and p^2+
C. Ca^2+ and p^3-
D. Ca^3+ and p^2-
Answer: The answer is C. Ca^2+ and P^3-
Explanation:
Just got it right
How many electrons can be described by the quantum numbers n = 2,1 – 3?
Answer:
a maximum number of 10 electrons can share
Explanation:
How many electrons in an atom can have quantum numbers of N 3 and ML 2?
Therefore, a maximum number of 10 electrons can share these two quantum numbers in an atom.
how many grams are in 2.34 moles of Li?
Answer:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Lithium, or 6.941 grams.
Thus, the answer would be 16.24194.
Explanation:
how many grams will be needed
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.
Describe how crude oil is separated into fractions by fractional distillation.
Answer:
Crude oil is separated by fractional distillation. Crude oil is heated to vaporize the different hydrocarbons in a tank which is cool at the top and hot at the bottom. The vapours then rise and the different hydrocarbons condense at their specific boiling points, allowing them to be separated.
Why do gems have different properties than metals? Claim,evidence and Reasoning
Answer:
Gems are natural material, metals are man-made materials!
Explanation:
Minerals occur naturally in the earth's crust and are defined as inorganic solids that have characteristic chemical composition and crystalline structures. ... A gemstone or gem is a piece of mineral crystal, which, in cut and polished form, is used to make jewelry or other adornments.
The explanation regarding the gems contains the various properties as compared to the metals should be described below:
Gems should be composed of the similar substance while on the other hand the metal compose of two or more elements of metallic. Gems should compose of non-metallic elements. Also, the gem does not compose of free electrons. While on the other hand, metal compose of free electrons that conduct electricity. So it does not conduct electricity such as metals.In this way, it should be explained.
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How many moles of CO2 gas will be produced in the reaction between baking soda (sodium hydrogen carbonate) and vinegar (acetic acid) if 6 mol of baking soda is reacted in excess vinegar?
Answer:
[tex]6molCO_2[/tex]
Explanation:
Hello there!
In this case, according to the described reaction, we can set up the chemical equation as shown below:
[tex]NaHCO_3+CH_3COOH\rightarrow CO_2+H_2O+CH_3COONa[/tex]
We can evidence the 1:1 mole ratio of baking soda (NaHCO3) to CO2 and therefore the produced moles of latter are calculated as shown below:
[tex]6molNaHCO_3*\frac{1molCO_2}{1molNaHCO_3} \\\\6molCO_2[/tex]
Best regards!
3 If methane burns in a poor supply of air it will give carbon
monoxide and water instead. See if you can write a balanced equation to show this.
Answer:
2CH4 + 3O2 → 2CO + 4H2O
Explanation:
When methane is burnt in adequate supply of oxygen, then carbon dioxide is produced but when methane is burnt in limited supply of oxygen, then carbon mono-oxide is produced.
The balanced equation for the same is as follows -
2CH4 + 3O2 → 2CO + 4H2O
Convert 230 centimeters into yards
It would be 2.515 yards. This is because to convert cm into yards, you would need to divide the length value by 91.44 so in your case, it would be 230÷ 91.44 which equals 2.51531.
Hope that helps!
Calculate the specific heat of an unknown metal if it took 58.1 J to increase the temperature of 89.4 g of the metal from 23.4°C to 25.5°C.
Answer:
[tex]c=0.309\ J/g^{\circ} C[/tex]
Explanation:
The increase in heat, Q = 58.1 J
Mass, m = 89.4 g
The temperature increases from 23.4°C to 25.5°C. We need to find the specific heat of an unknown metal.
We know that the increase in heat is given by :
[tex]Q=mc\Delta T\\\\c=\dfrac{Q}{m\Delta T}\\\\c=\dfrac{58.1}{89.4\times (25.5-23.4)}\\\\c=0.309\ J/g^{\circ} C[/tex]
So, the specific heat of an unknown metal is equal to [tex]0.309\ J/g^{\circ} C[/tex].
Which material would take the longest to cool off once heated?
Liquid water
Lead
Ice
Copper
Answer:
Liquid water
If you know that a star is large and red, what else is probably true about it?
O It is a white dwarf.
O It is warmer and brighter than the Sun
O It is cooler and dimmer than the Sun.
O It is cooler and brighter than the Sun.
Answer:
it is cooler and dimmer remember this red stars are old stars near their death
