Temperature affects both physical and chemical change because it modifies the state of matter and also it alters the rate of chemical reactions.
How does temperature affect physicochemical properties?Temperature affects physical properties by increasing the motion of constituent atoms and thus altering the state of matter.
Moreover, in a chemical reaction, an increase in temperature also affects the conversion rate of a reactant to one or more products.
In conclusion, temperature affects both physical and chemical change because it modifies the state of matter and also it alters the rate of chemical reactions.
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Which of the following observations would indicate that a material is a pure substance?
O It does not dissolve in water.
O It changes color after heating.
O It cannot be physically broken down into different types of atoms.
O It can be physically broken down into different types of molecules.
Answer:
C
Explanation:
Got it right on a test
How many grams of nitrogen,
N2, would be required to create 9.3
moles ammonia, NH3?
Answer:
Explanation:
Hi there!
N₂+3H₂⇋2NH₃
The molecular mass of NH₃ is 34
The mass of N₂ is 28 and mass of H₂ is 2.
Then,
2 moles of NH₃ is created by 28 g of N₂
1 moles of NH₃ is created by 28/2 g of N₂
9.3g of NH₃ is created by (28/2)*9.3 moles of N₂
Therefore, 130.2 g of N₂ is required to create 9.3 moles of NH₃.
Hope it helps!
N₂+3H₂⇔2NH₃
moles N₂ = 1/2 x 9.3 = 4.65
mass N₂ = 4.65 x 28 g/mol = 130.2 g
Discuss the importance of chemical reaction in our daily life?
Answer:
By observing chemical reactions, we are able to understand and explain how the natural world works. Chemical reactions turn food into fuel for your body, make fireworks explode, cause food to change when it is cooked, make soap remove grime, and much more.
hope it helps you
A voltaic cell is made using a lead electrode and copper electrode. The electrolytes for each half cell are lead nitrate and copper nitrate. Write the cell notation for this cell and calculate its cell potential (E°cell).
The cell notation is [tex]Pb_{(s)}[/tex] [tex]Pb^{2+} _{(aq)}[/tex] ║[tex]Cu^{+2}_{aq}[/tex] [tex]Cu_{(s)}[/tex] and the cell potential is 0.464
The reaction occurred while losing of hydron is known as oxidation reaction
We can also tell that the reaction occurred while gaining of oxygen atom is known as oxidation reaction.
The reaction occurred while gaining of hydrogen is known as reduction reaction or we can say that the reaction occurred while losing oxygen atom is known as reduction reaction
An electrochemical cell's cell potential is defined as the difference in potential between two half cells. The electrons' capacity to go from one half cell to the other is what causes the potential difference. As a result of the chemical reaction being a redox reaction, electrons can travel across electrodes.
Calculating the Cell potential
E°cell = E°(reduction) - E°(oxidation)
= 0.34 - (-0.0124)
= 0.464
Hence the cell potential is 0.464
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There are 6.02 x 10^23 formula units Na2O in a sample. How many grams of Na2O is this? The molar mass of Na2O is about 62 g/mol.
Answer:
= 62g
Explanation:
We have been asked to find the mass of Na2O having 6.02 x 10^23 units.
We know that one mole of a substance contains 6.02 x10^23 units/particles.
That means we have one mole of Na2O.
To find the mass of Na2O we use the formula,
mass = number of moles x formula mass
= 1 mole x 62g/mol
= 62g
Therefore the mass of Na2O with 6.02 x 10^23 units is 62g.
Please help answer ASAP
How does this evidence indicate that the reaction has occurred between ions? Be specific and explain why the meter readings change throughout the experiment.
The evidence indicate that the reaction has occurred between ions i.e, change of state of the reactants, e.g. precipitation.
What is Precipitation ?In an aqueous solution, precipitation is the process of transforming a dissolved substance into an insoluble solid from a super-saturated solution.
The reaction of the ions can be checked by a number of methods.
In a chemical reaction, the ions are in the acqeuos solution which means that they are in solution, dissolved with charge.
During the reaction (ionic) there is an attraction between the positive and negative ions.
This makes a change in the state of the reactants in the products.
In addition, the reaction can result in an immediate observable change such as the formation of a solid or precipitation.
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How many liters of a 4M solution can be made using 100 grams of LiBr?
Answer:
volume = 0.288 L
Explanation:
To find the volume, you need to (1) convert grams LiBr to moles LiBr (via molar mass) and then (2) calculate volume (via molarity equation). It is important to arrange the ratios in a way tat allows for the cancellation of units (desired units in the numerator).
(Step 1)
Molar Mass (LiBr): 6.9410 g/mol + 79.904 g/mol
Molar Mass (LiBr): 86.845 g/mol
100 grams LiBr 1 mole
----------------------- x ------------------ = 1.15 moles LiBr
86.845 g
(Step 2)
Molarity (M) = moles / volume (L)
4 M = 1.15 moles / volume
(4 M) x volume = 1.15 moles
volume = 1.15 moles / 4 M
volume = 0.288 L
A calorimeter absorbs 2,508 J of energy from the snack shown in the data below. How much energy does the snack provide per
gram (J/g) according to the experiment?
The energy provided by the snack is obtained as 1254 J/g.
What is the energy of the snack?The calorimeter is used to measure the energy content of food. The food is burnt in the calorimeter in order to determine the amount of energy that it contains. The mass of the food burnt is converted to energy.
Mass of food burnt = 3.52 g - 1.52 g = 2 g
The energy that is provided by the snack in J/g = 2,508 J/ 2 g
= 1254 J/g
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If a substance can be given a chemical formula can be considered to be a(n) __________.
If a substance can be given a chemical formula can be considered to be a(n) compound.
What is a compound?A pure substance made up of two or more different elements combined chemically in a fixed ratio is called a compound.
Compounds are substances composed of different elements bonded chemically; only chemical reactions break the chemical bonds or create new chemical bonds leading a compound to form other substances.
Hence, if a substance can be given a chemical formula can be considered to be a(n) compound.
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if element X has two valence electrons and element Y has five valence electrons the formula for the compound is?
Answer:
the answer to the question is X3Y2
what is the sum of the mass of each kind of atoms of elements in the formula of the compound?
The formula mass of a substance is the sum of the average atomic masses of each atom represented in the chemical formula and is expressed in atomic mass units. The formula mass of a covalent compound is also called the molecular mass.
lighting is more likely to strike a metal tower than a rubber hose because:
A. metal is a conductor and rubber is an insulator
B. the light from the tower attracts the electrons
C. the tower is negatively charged and will accept electrons
D. metal is an insulator and subnet is a conductor
What is the electron configuration for helium (He)?
O 1s¹
O 1s²
O 1s²2s¹
O 1s²2s²
Consider these two electron configurations for neutral atoms L and M.
L-1s²2s²2p^6 3s²
M-1s²2s²2p^6 3s¹3p¹
What is the atomic number of L?
Calculate electrons
1s²2s²2p⁶3s²[Ne]3s²Total electrons=10+2=12
The element is Magnesium with symbol Mg as atomic no is 12
Additional:-
M:-
1s²2s²2p⁶3s¹3p¹Excited state of magnesium
what's the geometry of sp³ hybridization ~
Answer:
For sp3 hybridized central atoms the only possible molecular geometry is tetrahedral.
find the relative atomic mass
Answer:
atomic mass = 16 amu
Explanation:
The atomic mass is the total protons and neutrons in an element. The atomic number represents the total number of protons.
In this form, the superscript (raised exponent) represents the mass number/atomic mass. The subscript represents the atomic number. Therefore, if the number (16) is the superscript, this must be your answer.
¹⁶₈Z
-----> 16 = mass number/ atomic mass
-----> 8 = atomic number
If you know the velocity at which an object is moving, which two things do you know about the object's motion?
O speed and direction
O
distance and speed
time and distance
O direction and time
Answer:
speed and direction are the two things
How many moles of oxygen gas (02) are
needed to completely react with 54.0 g of aluminum?
4A1+30₂ → 2Al2O3
54.0 g Al
1 mol Al 3 mol O₂
26.98 g Al 4 mol Al
[?] mol O₂
The number of moles of oxygen required to completely react with 54 g of aluminum is 1.5 moles.
Number of moles of the reacting aluminum
moles = reacting mass/molar mass
moles = 54/27
moles = 2 moles
From the given reaction of oxygen and aluminum;
4Al + 30₂ → 2Al₂O₃
4 moles of Al ----------> 3 moles of oxygen
2 moles of AL --------> ? moles of oxygen
= (2 x 3)/4
= 1.5 moles
Thus, the number of moles of oxygen required to completely react with 54 g of aluminum is 1.5 moles.
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________ is defined as a method of preparing cocaine as a chemical substance so that it can be smoked.
Freebase is defined as a method of preparing cocaine as a chemical substance so that it can be smoked because is is extracted or deduced from the natural source which is plant
What is freebase?Freebase is a that is use while producing cocaine in other to free or extract the base from the natural source which is plant and after which it is grinded into powder so that it can be smoked or sniffed.
Therefore, Freebase is defined as a method of preparing cocaine as a chemical substance so that it can be smoked because is is extracted or deduced from the natural source which is plant
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Atom is a smallest particle of an element which have all the chemical properties of that element.What is the origin of Atom.
Answer:
ORIGIN OF ATOM.Sometimes peoples like to say that atom is like a cell in living things,is it true?comment below,letss goo!!
Explanation:
A greek philosopher known as Democritus was the first to consider the idea that matter is made up of small particles ,about 400BC.
Since there was no experimental evidence to support his idea,it was not accepted.
About 2000 years later an English man called John Dalton revived the discussion.He used experimental evidence to support his idea to convince people that matter is made up of particles called atoms.It accepted!.
An English man called John Dalton revived the discussion.He used experimental evidence to support his idea to convince people that matter is made up of particles called atoms.It was accepted ,he conclude the following theories:
Matter is made up of tiny particles called atom which cannot be splitted into simpler substancesAtom cannot be created nor destroyedWhich statement best describes a physical change?
Explanation:
A physical change is one which can be reversed.it also does not produce any new substance.
changes in state such as the melting of a solid, the freezing and vaporization of a liquid as well as changes In shape are examples of physical changes
What would cause a nucleus to be unstable?
A. An unequal number of protons and electrons
B. Too few quarks within the nucleus of the atom
C. An equal number of protons and neutrons
D. An imbalance between the electrostatic and strong nuclear forces
SUBMIT
The instability of the nucleus is due to an imbalance between the electrostatic and strong nuclear forces, which is option D.
A nucleus can become unstable if there is an imbalance between the electrostatic repulsion between protons and the strong nuclear force that holds the nucleus together. The electrostatic repulsion between protons tends to push them apart, while the strong nuclear force acts to hold the protons and neutrons together.
If the number of protons in the nucleus is too large, the electrostatic repulsion becomes stronger, making the nucleus unstable. Similarly, if the number of neutrons is too large or too small compared to the number of protons, it can also lead to an imbalance in the forces and instability of the nucleus.
Therefore, the correct option is option d.
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Select the correct answer.
What is the purpose of the arrow in a chemical equation?
OA. It indicates the direction in which the reaction occurs.
OB.
It separates the elements from the compounds.
OC.
It indicates the direction of increase in the number of molecules.
It indicates the direction of heat movement in a reaction.
O D.
Reset
Next
Answer: A. It indicates the direction in which the reaction occurs.
3
Which statement describes the law of conservation of energy?
O All systems will exchange matter and energy with their surroundings.
O All systems can exchange energy, but not matter, with their surroundings.
Energy cannot be created nor destroyed, but it changes from one form to another.
O Energy is destroyed in most chemical reactions when new products are formed.
Energy cannot be created nor destroyed, but it changes from one form to another. Hence, option C is correct.
What is energy?Energy is the ability to do work.
In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time.
This law means that energy can neither be created nor destroyed; rather, it can only be transformed or transferred from one form to another.
Hence, option C is correct.
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The theoretical yield of silver was
determined at 241 g Ag through
calculation. Instead, the reaction
generated only 192 g Ag. What is the percent yield of the reaction?
2AgNO3 + Zn → 2Ag + Zn(NO3)2
[?] %
Answer:
79.7%
Explanation:
Percentage yield = (actual yield/theoretical yield)*100%
Therefore percentage yield for this experiment is: [tex]\frac{192}{241} *100%[/tex]%
[tex]= 0.79668*100[/tex]%
Percentage yield = 79.668%
Rounded to 3 significant figures is 79.7%
Hope this helped!
Help me please!! Is for my finals!!
Answer:
C.) They have fewer electrons than protons
Explanation:
Charges on ions are determined by the ratio of electrons to protons. Neutral elements have the same number of protons and electrons. Remember: protons have a positive charge and electrons have a negative charge. However, based on the amount of electrons these elements have, some are more or less willing to give up their electrons to participate in ionic bonding. Potassium usually gives up 1 electron because this satisfies the octet rule. By removing this electron, the element has more protons than electrons, giving it an overall +1 charge.
How do we investigate translocation using tracers?
Translocation can be investigated by using radioactively labelled tracers, which are absorbed into glucose during photosynthesis.
What is translocation?Translocation can be defined as a biological process which involves the transfer (movement) of water and other soluble nutrients from one part of a plant to another, especially through the xylem and phloem.
Generally, translocation can be investigated by using radioactively labelled tracers, which are absorbed into glucose during photosynthesis. Also, an x-ray turns black when exposed to this biological process in plants.
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What is the volume of 0.24 mol oxygen (02) gas at 345 k and a pressure of 0.75
9.06 L is the volume of 0.24 mol oxygen (02) gas at 345 k and a pressure of 0.75.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates to the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
We know that the ideal gas equation relates the pressure, volume, temperature, and moles of gases as:
PV =nRT
This is a combined gas law based on other gas law like Boyle's law, Charle's law, Avagadro's law, Gay Lussac's law
P = pressure = 0.75 atm
V = volume = ?
n = moles = 0.24 mol
R = 0.0821 L atm / molK [gas constant]
T = temperature = 345 K
Putting the values
Volume =[tex]\frac{nRT}{ P}[/tex]
Volume = 0.24 X 0.0821 X 345 / 0.75
= 9.06 L
Hence, 9.06 L is the volume of 0.24 mol oxygen (02) gas at 345 k and a pressure of 0.75.
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Why do you think it is important to record your data with all the decimals provided by the instruments even if they are zero? how does this help with data analysis?
It is important to record your data with all the decimals provided by the instruments even if they are zero because it increases the accuracy of the measurement.
What is accuracy in experimentation?Accuracy refers to the ability to take correct measurement values during a specific experiment and/or observational procedure.
Accuracy is a fundamental issue in data analysis and helps to obtain conclusions from a given experimental procedure.
In conclusion, it is important to record your data with all the decimals provided by the instruments even if they are zero because it increases the accuracy of the measurement.
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in chemistry what is Faraday's law
Answer:
Faraday’s – First Law of Electrolysis
It is one of the primary laws of electrolysis. It states, during electrolysis, the amount of chemical reaction which occurs at any electrode under the influence of electrical energy is proportional to the quantity of electricity passed through the electrolyte.
Faraday’s – Second Law of Electrolysis
Faraday’s second law of electrolysis states that if the same amount of electricity is passed through different electrolytes, the masses of ions deposited at the electrodes are directly proportional to their chemical equivalents.
From these laws of electrolysis, we can deduce that the amount of electricity needed for oxidation-reduction depends on the stoichiometry of the electrode reaction.
The product of an electrolytic reaction depends on the nature of the material being electrolysed and the type of electrodes used. In the case of an inert electrode such as platinum or gold, the electrode does not participate in the chemical reaction and acts only as a source or sink for electrons. While, in the case of a reactive electrode, the electrode participates in the reaction.
Hence, different products are obtained for electrolysis in the case of reactive and inert electrodes. Oxidizing and reducing species present in the electrolytic cell and their standard electrode potential too, affect the products of electrolysis.
FAQs
1. What’s a Faraday?
Ans: The Faraday is an electric charge volume unit without measurements, equal to approximately 6.02 x 10 23 electric charge carriers.
2. Why is Faraday’s law important?
A shifting magnetic flux creates an electric field, according to Faraday’s law. Faraday’s law is particularly important since it addresses the connection of the E-field and the B-field and understands that this connection necessitates flux fluctuation over time.
3. How does electrolysis remove rust?
Ans: Electrolysis is a method of removing iron oxide by passing a small electrical charge through the rusty metal from a battery or battery charger to induce ion exchange while the device is submerged in an electrolyte solution.
4. What happens to water during electrolysis?
Ans: Water’s Electrolysis. By passing an electrical current through it, water can be decomposed. When this happens, an oxidation-reduction reaction is caused by the electrons from the electric current.
5. What is the negative electrode called in electrolysis?
Ans: Through electrolysis, the negatively charged electrode is called the cathode. The positively charged electrode is called the anode in electrolysis. Negatively charged ions are moving towards the anode.
Hope it helps!
Answer:
Faraday's law states that the absolute value or magnitude of the circulation of the electric field E around a closed loop is equal to the rate of change of the magnetic flux through the area enclosed by the loop.
Explanation:
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