Answer:
As the size of a star increases, luminosity increases. If you think about it, a larger star has more surface area. That increased surface area allows more light and energy to be given off.
Aluminum metal reacts with aqueous nickel(II) sulfate to produce aqueous aluminum sulfate and nickel as a precipitate. In this reaction 108 g of aluminum were combined with 464 g of nickel(II) sulfate to produce 274 g of aluminum sulfate.
The question is incomplete, the complete question is;
In this stoichiometry problem, determine the percentage yield:
Excess aluminum metal reacts with aqueous nickel(II) sulfate to produce aqueous aluminum sulfate and nickel as a precipitate. In this reaction 108 g of aluminum were combined with 464 g of nickel(II) sulfate to produce 274 g of aluminum sulfate.
Answer:
80%
Explanation:
The reaction equation is;
2Al(s) + 3NiSO4(aq) --------> Al2(SO4)3 + 3Ni(s)
Since Al is in excess then NiSO4 is the limiting reactant.
Number of moles in 464 g of NiSO4 = mass/ molar mass
Molar mass of NiSO4 = 155 g/mol
Number of moles = 464g/155g/mol = 2.99 moles
Number of moles of Al2(SO4)3 = mass/molar mass
molar mass = 342 g/mol
Number of moles = 274g/342g/mol = 0.8 moles
From the reaction equation;
3 moles of NiSO4 yields 1 mole of Al2(SO4)3
2.99 moles of NiSO4 yields 2.99 * 1/3 = 1 mole of Al2(SO4)3
% yield = actual yield/ theoretical yield * 100/1
actual yield = 0.8 moles of Al2(SO4)3
Theoretical yield = 1 mole of Al2(SO4)3
% yield = 0.8/1 * 100 = 80%
In this exercise we have to use the knowledge of reaction to calculate the required percentage, in this way we find that:
[tex]80\%[/tex]
The reaction equation is;
[tex]2Al(s) + 3NiSO_4(aq) \rightarrow Al_2(SO_4)_3 + 3Ni(s)[/tex]
Since Al is in excess then NiSO4 is the limiting reactant. Now knowing that the data informed is:
Number of moles in 464 g of NiSO4 Molar mass of NiSO4 = 155 g/mol Number of moles = 2.99 moles Number of moles of Al2(SO4)3 Molar mass = 342 g/mol Number of moles = 0.8 moles
From the reaction equation;
[tex]\% yield = actual\ yield/ theoretical\ yield * 100/1\\\% yield = 0.8/1 * 100 = 80%[/tex]
See more about reaction at brainly.com/question/3664113
True or false. As a wave travels through a given material its velocity changes.
Answer:
true
Explanation:
Answer:
false
Explanation:
i took the test and got it right
What is the volume of a flask that contains 0.730 moles of Nitrogen at a pressure of 698 mmHg and a temperature of 35.4°C?
Answer:
V = 20.1 L
Explanation:
Given data:
Volume of flask = ?
Number of moles of nitrogen gas = 0.730 mol
Pressure = 698 mmHg (698/760 = 0.92 atm)
Temperature = 35.4°C
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
35.4+273 = 308.4 K
by putting values,
0.92 atm× V = 0.730 mol ×0.0821 atm.L/ mol.K × 308.4 K
V = 18.48 atm.L / 0.92 atm
V = 20.1 L
what is the charge of an anion
Answer:
negative charge
Explanation:
An anion has more electrons than protons, consequently giving it a net negative charge.
hope this helps, pls mark brainliest :D
The empirically formula for a compound is CH3. If the multiplier is 2, what is the molecular formula?
Answer:
C₂H₆
Explanation:
Here,
The Empirical Formula is CH₃
Now, 2 × CH₃ = C₂H₆
Thus, The Molecular Formula of CH₃ is C₂H₆
-TheUnknownScientist
1. Air contains mostly nitrogen (78%) and oxygen (21%). It also contains other gases, including carbon dioxide and helium, and various pollutants (both gases and solids). Write a brief explanation about why air is a mixture, whether it is homogeneous or heterogeneous, and how it can be separated into its components.
Answer:
It also contains other gases, including carbon dioxide and helium, and various pollutants (both gases and solids).
How many moles of H2O are formed from the combustion of 5.0 mol CH4
Question:
How many moles of H2O are formed from the combustion of 5.0 mol CH4
Answer:
For any balanced chemical reaction, whole numbers (coefficients) are used to show the quantities (generally in moles ) of both the reactants and products. For example, when oxygen and hydrogen react to produce water, one mole of oxygen reacts with two moles of hydrogen to produce two moles of water.
(HELP FAST )What occurs when a pure liquid substance is cooled?
Answer:
The particles in the substance become less active
What is tantalum's electron configuration?
Answer:
Xe 4f14 5d3 6s2
Explanation:
A student found the percent composition of CO to be 50% C and 50% O. What did the student do Incorrectly? What is the percent composition of CO?
Answer:
O = 57.14%
C = 42.86%
Explanation:
First of all we will calculate the molar mass of CO.
C = 12 g/mol
O = 16 g/mol
CO = 12 g/mol + 16 g/mol
CO = 28 g/mol
Percent composition:
C = (12 g/mol /28 g/mol ) × 100
C = 42.86%
O = (16 g/mol /28 g/mol ) × 100
O = 57.14%
Answer:
it should be 42.86% carbon and 57.14% oxygen
C = 12
O = 16
CO = 12 + 16
CO = 28
C = (12 /28 ) × 100
C = 42.86%
O = (16 /28 ) × 100
O = 57.14%
What is a reduction reaction?
A. A reaction in which an atom forms a new isotope by gaining neutrons.
B. A reaction in which charged particles form an ionic compound.
C. A reaction in which negatively charged particles are in the products.
D. A reaction in which an atom has gained 1 or more electrons.
Answer:
D. A reaction in which an atom has gained 1 or more electrons.
Explanation:
The oxidation reduction reactions are called redox reaction. These reactions are take place by gaining or losing the electrons and oxidation state of elements are changed.
Oxidation:
Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.
Reduction:
Reduction involve the gain of electron and oxidation number is decreased.
Consider the following reactions.
4KI + 2CuCl₂ → 2CuI + I₂ + 4KCl
The oxidation state of copper is changed from +2 to +1 so copper get reduced by gaining the one more electron
How much energy does it take to freeze 30.0g of H2O at 0 oC?
Energy to freeze : 10020 J
Further explanationGiven
mass of H₂O = 30 g
Required
Energy to freeze
Solution
Reaction
H₂O(l) ⇒ H₂O(s)
The heat to change the phase can be formulated :
Q = mLf (melting/freezing)
Lf = latent heat of fusion (for water/ice = 334 J/g)
Then heat to freeze :
[tex]\tt Q= 30\times 334=10020~J[/tex]
The salt in ocean water comes from all of the following EXCEPT
A
eroding land.
В.
melting glacial ice.
C
volcanic emissions.
D
reactions on the sea floor.
Answer:B
Explanation:
Had the same test years ago
The salt in ocean water comes from various sources such as the volcanic emissions, land eruption, ionic reactions in sea floor etc. but not from the melting of glacial ice.
What is salt in ocean water?Salt in ocean water is the ionic compound NaCl that we are using as the table salt to add in foods. The Na+ and Cl- ions are reaching to the ocean through various geographical process.
One of them is volcanic eruptions by in the tectonic plate boundaries. Volcanoes containing sulfur and chlorine atoms which are falling to the ocean. Similarly land eruption also result in salt formation in oceans.
Land rocks contains minerals such as limestone, epsom salt, and table salt. Weathering process break down these minerals and dissolve in water. Melting of glacial ice increases the water level but does not make water salty.
To find more on weathering, refer here:
https://brainly.com/question/14426457
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Name the three stress forces that cause changes in Earths crust. Explain how each type of force affects rock.Identify the type of fault that each force produces. This is science i couldnt find a science thing
Answer:
Shear
Tension
Compression
Explanation:
The 3 stress forces are;
-shear
-tension
-compression
1) Shear is the stress force that pushes back a mass of rock in two opposite directions which in turn will produce strike - slip faults.
2) Tension is the stress force that pulls on the crust thereby stretching in a manner that it becomes thinner at its middle which in turn will produce normal faults.
3) Compression is the stress force that makes rocks squeeze until they fold or break and this will in turn produce reverse faults.
what so ammonia and bleach make
blease help i know its something dangerous but I'm not sure and dont want to accidentally kill my family
Answer:
Mixing bleach and ammonia will create a toxic chloramine gas. Exposure to chloramine gas can cause irritation to your eyes, nose, throat, and lungs .
if you do accidentally mix bleach and ammonia, get out of the contaminated area and into fresh air immediately.
hope this help u ☆
A can of cola contains approximately 240 calories. If you consume two cans of cola each day for one week, approximately how many calories did you consume from cola?
Select one:
a)3,400 calories
b)70 calories
c)1,700 calories
d)480 calories
Answer:
[tex]\boxed{\pink{\sf Option \ (a) \ is \ Correct .}}[/tex]
Explanation:
Given that , A can of cola contains approximately 240 calories. And we consume two cans of cola each day. So , calories consumed in one day
[tex] = 2 \times 240 calories \\\\= 480 calories [/tex]
In a week there are seven days. So calories consumed in a week
[tex]= 7 \times 480 calories \\\\= 3360 calories [/tex]
Which is approximately equal to 3,400 calories.
Hence option (a) is correct .Richard and Brooke's teacher tells them to place 30 marbles in an 8-inch
baking pan to make a model. She tells them that each marble represents
a water molecule in the liquid state. Then she asks them to move their
model to show what happens to the liquid water molecules when heat is
added. What do Richard and Brooke do to show this?
They spread the marbles to the edges with their hands.
They tilt the pan so the marbles move to one side of the pan.
They push the marbles to the center of the pan with their hands
They gently shake the pan causing the marbles to move back and forth.
Answer:
The correct answer is - They gently shake the pan causing the marbles to move back and forth.
Explanation:
When water is heated the molecules present in its liquid state start to move and vibrate faster and allows the water to expand and increase in volume. If the heat is continuously applied to the water its molecules move even faster and escape in the form of molecules of vapor to the atmosphere.
To exhibit this phenomenon by the marble and pan, Richard and Brooke should gently shake the pan causing the marbles to move back and forth which shows faster vibration and movement of molecules.
nonmetallic elements form ions by ____________
valence electrons to complete their outer shell.
gaining or losing?
Answer:
you know it is what it is☠
Explanation:
Nonmetallic elements form ions by valence electrons to complete their outer shell. The valence electrons an element has in its outer shell, the easier it is to complete. The electron shells an element has, the easier it is to fill its outermost shell.
where is the mass of an atom located?
how do people start alcohol consumption
Answer:
Explanation:Due to the mental pressure,
Due to peer pressure,
Lack of love and affection from the family members.
Influence from the T.V advertisement.
HELP! ASAP! WILL MARK BRAINLIEST!!
A metal atom that loses electrons is called a/an _______.
Answer:
It is called ions
Explanation:
Metal atoms lose some of their valence electrons through a process called oxidation, resulting in a large variety of ionic compounds including salts, sulfides, and oxides. The properties of metals, combined with the chemical action of other elements, results in the transfer of electrons from one atom to another.
Answer:
its called an ion
Explanation:
an ion is an electrically charged atom
Question 5
2 pts
Which regions did the Byzantine emperor Justinian conquer in an attempt to
revive the Roman Empire?
North Africa and Persia
North Africa and the Italian Peninsula
Persia and Egypt
Gaul and the British Isles
Answer:
I believe it's ... North Africa and the Italian Peninsula
G. Science:
In the following chemical reactions which are the reactants? iron+ sulphur= iron suphide.
(a): Iron and iron sulphide
(b): iron and sulphur
(c): iron, sulphur, and iron sulphide
(d): sulphur and iron sulphide
what geologic process directly forms beaches on the shores of the bay?
The geologic process that directly forms beaches on the shores of the bay should be considered as the sediment deposition.
What is sediment deposition?The Deposition refer to the laying down of sediment that should be carried by wind, where the water should be flowing down or there is the sea or ice. Sediment could be transported just like the pebbles, sand ,and mud, or as salts mix in the water.
Therefore, The geologic process that directly forms beaches on the shores of the bay should be considered as the sediment deposition.
Learn more about geologic here: https://brainly.com/question/3101097
what does a net ionic equation show about a reaction
Answer:
A net ionic equation shows only the chemical species that are involved in a reaction, while a complete ionic equation also includes the spectator ions.
Brainlist pls!
If energy absorbed is greater than energy emitted does temperature increase or decrease?
Answer:
the decrease is the answer to the question
Why does oxygen bond with hydrogen to make water?
Group of answer choices
A) Because oxygen only has 6 electrons in its outer shell and it wants 8. It binds with 2 hydrogens because each hydrogen atom has 1 electron in its outer shell.
B) Because oxygen only has 8 electrons in its outer shell and it can take 4 more. It binds with 2 hydrogen atoms because each hydrogen atom can carry 2 electrons in its outer shell.
C) Because oxygen only has 2 electrons in its inner shell and it needs 6 more to make 8. It binds with 6 hydrogens to fill up its shell.
D) No answer text provided.
answer: c
because if you really picture it and look at each of them carefully it is c
A student places four identical cells into four different liquids. Over time which cell will look the smallest WXY or Z
Answer: W
Explanation:
The cell in liquid W will look the smallest out of the four because of Osmosis.
Osmosis is a process by which water molecules move from an area of relatively higher concentration of water to an area with a relatively lower concentration through a selectively permeable membrane(cell membrane).
With W being saltier than the cell, water molecules will move from the cell to liquid W to balance the concentrations inside and outside the cell which will lead to the cell in W being smaller.
my grades are as the following;
86.7%
82.1%
77.7%
88.3%
69.2%
what is my gpa im having trouble trying to find out
Answer:
try a calulator online just go to g.oogle and type in gpa calculator
12. Which one of the following is not true about the reaction of: CH3-CH3+Cl2...CH3CH2Cl+HCl? * *
it is elimination reaction
it is photochemical reaction
it is chlorination reaction
it is substitution reaction
Answer:
it is elimination reaction
Explanation:
Because substitution takes place not elimination