The given elements are Na, Ag and Au.
1. Sodium(Na)
Mass number= 23 u
Atomic number=11
Number of protons= Number of electrons= Atomic number=11
Number of neutrons= Mass number- Number of protons=23-11=12
2. Silver (Ag)
Mass number= 108 u
Atomic number= 47
Number of protons= Number of electrons= Atomic number= 47
Number of neutrons= Mass number- Number of protons=108-47=61
3. Gold (Au)
Mass number= 197 u
Atomic number= 79
Number of protons= Number of electrons= Atomic number= 79
Number of neutrons= Mass number- Number of protons= 197-79=118
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What trophic level has heterotrophs?
a only the second level
b all levels except the first
C only the first level
d only the last level
is mixing acid and base a chemical change or a physical change
Answer : chemical reaction
Mixing an acid with a base is a common chemical reaction.
Answer:
It is a chemical reaction.
Explanation:
Mixing acid and base is a common chemical reaction.
(I had my answer in the comments bc at the time I couldn't submit it as a answer so here ya go)
Hope this helps! :)
What is the function of the load in
an electric circuit?
Combustion of 28.0 g of gasoline releases 322 kcal of thermal energy. How many kilojoules of energy are released?
In the combustion of 28.0 g of gasoline, 1348.1 kilojoules of energy are released.
To find the energy released, we need to convert the energy in kilocalories to kilojoules.
We need to remember that:
1 cal = 4.1868 J (joules)1 kcal = 1000 cal1 kJ = 1000 JHence, the energy in kJ is:
[tex] E = 322 \:kcal*\frac{4.1868 \:J}{1 \:cal}*\frac{1000 \:cal}{1 \:kcal}*\frac{1 \:kJ}{1000 \:J} = 1348.1 \:kJ [/tex]
Therefore, 1348.1 kilojoules of energy are released.
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Liquid octane CH3(CH2)6CH3 will react with gaseous oxygen O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O. Suppose 3.43 g of octane is mixed with 7.0 g of oxygen. Calculate the maximum mass of water that could be produced by the chemical reaction. Round your answer to significant digits.
Answer:
88 gram is the answer in 2 significant digits
One mole of octane gives 9 moles of water. Then, 3.43 g or 0.03 moles of octane will give 0.27 moles of water that is 4.86 g of water can be produced.
What is combustion reaction ?Combustion is a type of chemical reaction in which a gas reacts with oxygen to give carbon dioxide and water.
The combustion reaction of octane is given as follows:
[tex]\rm C_{8}H_{18} + \frac{25}{2}O_{2} \rightarrow 8CO_{2} + 9 H_{2}O[/tex]
As per this balanced chemical equation, one mole or 114 g of octane gives 9 moles of water.
no.of moles in 3.4 g of octane = 3.4 g/114 g = 0.03 moles.
no.of moles of water produced from 0.03 moles of octane :
= (0.03 × 9) = 0.27 moles.
Molar mass of water = 18 g/mol
then, mass of 0.27 moles = 0.27 × 18 =4.86 g.
Therefore, the maximum mass of water that could be produced here is 4.86 g.
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Giving brainliest!!!!!!!!!!!!!
I am the first one to comment, please give me the brainliest <3
Please answer please
Answer:
1k km
Explanation:
3. What is the picture displayed? *
1 point
a.atom
b.molecule
c.element
d.compound
molecule (hope this helps :))
_________ is when humans choose the traits of an organism.
Your answer should be -selective breeding
[tex]hope that helps[/tex]
Which of the following steps is important to critical thinking?
implementing solutions
b utilizing facts
c. holding firm to conclusions
d answering questions
Please select the best answer from the choices provided
Answer:
b
Explanation:
edge 2022
Why do you think some seasons are more likely than others to experience a tornado
How many grams are there in 7.4x10^23 atoms of AL
Answer:
24 grams of FeF3
Explanation:
what would happen if you added silver nitrate to a solution of sodium chloride?
Answer:
When silver nitrate solution is added to sodium chloride solution, then a white precipitate of silver chloride is formed along with a sodium nitrate solution.
Explanation:
when silver nitrate solution is added to sodium chloride solution, a white precipitate of silver chloride is formed along with sodium nitrate solution.
AgNO3 + NaCl ----- AgCl + NaNO3
AgCl is white precipitate.
double displacement reaction
Hydrogen protons collide with one another to create:
A). Helium and energy.
B). Boron and energy.
C). Carbon monoxide and energy. D). None of the above.
Helpppp meeeee!!! I beg you
Answer:
True
Explanation:
Write a balanced chemical equation for the standard formation reaction of solid calcium oxide (CaO).
Answer:
2Ca +O2 ----------> 2CaO ( Balanced Reaction)
The balanced chemical equation for the standard formation reaction of solid calcium oxide (CaO) is
Ca + O2 --> CaO2
Heya are balanced equations?A balanced chemical equation is an equation in which the the number of atoms of each elements on both the reactant and products sides are equal.
Calcium oxide is an alkaline which is solid at room temperature and is formed by the reaction of one atom of calcium and two atoms of oxygen.
Therefore, the balanced equation of formation reaction of solid calcium oxide (CaO) is Ca + O2 --> CaO2.
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when an electron moves from a higher orbit to a lower one does it always follow the same path explained
Yes, electron follows the same path when it absorb and loses energy.
Yes, when an electron moves from a higher orbit to a lower orbit it always follow the same path as it moves from a lower orbit to a higher orbit. When electron absorb energy it has the power to move from lower orbit to higher orbit or energy level.
While on the other hand, when an electron loses that energy, it comes back to its original position from which it moves earlier when it absorb energy so we conclude that electron follows the same path when it absorb and loses energy.
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Light-DEPENDENT reactions do NOT involve which of the following?
A. sunlight
B. chlorophyll
C. water
D. carbon dioxide
Answer:
The answer to your question is D. carbon dioxide
Explanation:
Light-DEPENDENT → The light-dependent reactions convert light energy into chemical energy.
Drag electrons back and forth until the molecule of oxygen (O2) is stable. Click Check to confirm your molecule is stable. How many pairs of shared electrons are there in a stable molecule of oxygen?
Answer:
2 pairs (4 electrons)
Explanation:
In a molecule of oxygen there are 2 oxygen atoms. There are 6 electrons in the outer shells of oxygen atoms. When 2 oxygen atoms form a covalent bond they share their electrons. In a diagram this would be represented by the overlap of the two circles representing the outer shells of both oxygen atoms. If each oxygen atom 'puts forward' 2 electrons into the centre, then 4 will be shared overall for each atom, making both atoms have full outer shells of 8 electrons each. 4 electrons make 2 pairs, hence the answer.
Can a stable compound be made from these two atoms? Explain why or why not.
The given oxygen and lithium atoms are unable to form a stable compound.
The given atoms to form a stable compound has been oxygen and lithium.
A stable compound has been formed when the transfer of atom has been resulted in the completion of the valence shell of both the electrons.
The oxygen has 6 valence electrons and require to gain 2 electrons to form the stable compound. The Lithium has 3 electrons and has been able to lose 1 electron to form a stable compound.
Since, the formation of stable compound between oxygen and lithium requires transfer of 2 electrons, and there has been availability of 1 electron from Li. Thus, the atoms are unable to form a stable compound.
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PLEASE PLEASE HELP ME WITH THIS ASAP
Answer: 3.45
Explanation:
The following reaction represented oxidation of organic matter (CH2O) using nitrate ions.
If G° = -118.7Kj/mol at 25°C, calculate E°CELL and the equilibrium constant for this
reaction:
14 CH20 + 1/5 NO3 +1/5 H
= CO2 + 1/10 N2 +7/20 H2O
[5]
sorry but i don't know again sorry!
The periodic table of elements is composed of many
Answer:
The periodic table is composed of many elements.
Explanation:
1. it's in the name.
2. if you search up what is the periodic table made of (Not that I did) it will say elements.
Brainliest if you liked the answer please.
A reaction occurs that results in a molecule with two atoms of the same element. The atoms share six electrons. Which molecule could be the product of the reaction?
Si2
N2
O2
F2
Answer:
n2 is correct
Explanation:
i took it just now. :)
The product of this reaction could be N2.
Among the options, only atoms of nitrogen have five electrons on their outermost shell.
The fact that they have five electrons in their outermost shells implies that they can combine by sharing six electrons in a triple bond.
When this occurs, each of the nitrogen atoms involved in the bond now has an octet of electrons. Hence, the product formed when the atoms share six electrons. Which molecule could be the product of the reaction is N2.
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Can somebody please help me do the last part of the paper with the help of the information on top
Answer:
i dont know the answer of this question... im sorry
11. A cart is loaded with a brick and pulled at constant speed along an inclined plane to the height of a seat-top. If the
mass of the loaded cart is 3,500g and the height of the seat top is 0.45 meters, then what is the potential energy of the
loaded cart at the height of the seat-top?
Answer:
15.75 J
Explanation:
Potential energy
= mgh
= 3,500 g × 10 m/s² × 0.45 meters
= 3.5 kg × 4.5 m²/s²
= 15.75 J
Another way to say density
A. Density
B. Mass divided by volume
C. Water
D. Element
In chemistry, densities of substances are often compared to the density of this substance.
A. Density
B. Mass divided by volume
C. Water
D. Element
These have unique densities associated with them.
A. Density
B. Mass divided by volume
C. Water
D. Element
Answer:
A
Explanation:
Another way to say Density is Density
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. The density is mass divided by volume. the correct option is option A.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water. Density is mass divided by volume.
Mathematically, density can be written as : Density = Mass of the substance÷ volume marked on the graduated cylinder. Density is directly proportional to mass and inversely proportional to volume. Density of water is 1 gram per cubic centimeter.
Therefore, density is mass divided by volume. the correct option is option A.
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freezing point depression is
18) Max can lift 180 x 104 grams with ease. How much is this in pounds
Answer:
41.184 pounds
Explanation:
Calculate the total grams first.
180 x 104 = 18,720 grams
Convert that into kilograms (kg)
18,720g 1 kg
------------ X ------------- = 18.720 kg
1 1000 g
Convert kilograms into pounds.
18.729 kg 2.2 lb
--------------- X ----------- = 41.184 lb (pounds)
1 1 kg
Which of the following is the smallest number?
100
1
.0035
.0000000000000000000003
Answer:
.0000000000000000000003
Explanation: