### Which Statement Is A Correct Expression Of The Law Of Conservation Of Mass?

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• 15 According to the ‘Law of conservation of mass’, mass is neither created nor destroyed in a chemical reaction.

## What statement is correct for the law of conservation of mass?

The law of conservation of mass states that in a chemical reaction mass is neither created nor destroyed.

## Which is a correct expression for the law of conservation of energy?

According to the law of conservation of energy, energy cannot be created or destroyed, although it can be changed from one form to another. KE + PE = constant. A simple example involves a stationary car at the top of a hill.

#### Which of the following statement is not true about the law of conservation of mass?

The correct answer is: During the physical changes, the law of conservation of mass is not followed. –

#### What is the statement of the law of conservation?

The law of conservation of energy states that energy can neither be created nor destroyed – only converted from one form of energy to another. This means that a system always has the same amount of energy, unless it’s added from the outside. This is particularly confusing in the case of non-conservative forces, where energy is converted from mechanical energy into thermal energy, but the overall energy does remain the same.

is the total internal energy of a system, is the initial internal energy of a system. is the work done by or on the system. is the heat added to, or removed from, the system.

It is also possible to determine the change in internal energy of the system using the equation: This is also a statement of the first law of thermodynamics, While these equations are extremely powerful, they can make it hard to see the power of the statement.

• The takeaway message is that energy cannot be created from nothing.
• Society has to get energy from somewhere, although there are many sneaky places to get it from (some sources are primary fuels and some sources are primary energy flows ).
• Early in the 20 th century, Einstein figured out that even mass is a form of energy (this is called mass-energy equivalence ).

The amount of mass directly relates to the amount of energy, as determined by the most famous formula in physics:

is the amount of energy in an object or system. is the mass of the object or system. is the speed of light, roughly,

### What is the law of conservation of mass Mcq?

Law of Conservation of Mass Chemistry Questions with Solutions –

• Q1. The Law of Conservation of mass was given by-
• a.) Julius Robert Mayer
• b.) Antoine Laurent Lavoisier
• c.) Dmitri Ivanovich Mendeleev
• d.) Linus Carl Pauling

Correct Answer. (b.) Antoine Laurent Lavoisier Q2. Barium chloride reacts with sodium sulphate and forms Barium sulphate and sodium chloride. Which of the following statement is correct according to the law of conservation of mass? a.) The total mass of reactants, barium chloride, and sodium sulphate taken is greater than the total mass of the products, barium sulphate, and sodium chloride.b.) The total mass of reactants, barium chloride, and sodium sulphate taken is less than the total mass of the products, barium sulphate, and sodium chloride.c.) The total mass of the reactants is equal to the total mass of the products.d.) None of the above Correct Answer- (c.) The total mass of the reactants is equal to the total mass of the products.

1. Q4. Another name for the law of conservation of mass is-
2. a.) Law of chemical combination
3. b.) Law of mass action

c.) Law of conservation of energy.d.) Law of indestructibility Correct Answer. (d.) Law of indestructibility Q5. Why is there no mass change during chemical reactions? Answer. Atoms are neither created nor destroyed during a chemical reaction. To form products, the atoms of the reactants are simply rearranged.

• The investigation and creation of chemical reactions.
• You can use this law to calculate the quantities of reactants and products.
• By applying the law to their laboratory practices, manufacturers can increase efficiency.

Q8. Why should the Law of conservation of mass be considered the Law of conservation of mass and energy? Answer. The mass of the products in nuclear reactions is observed to be less than the mass of the reactants. According to Einstein’s equation, E=Δmc 2, the difference in mass, known as the mass defect, is converted into energy.

• Answer. Hydrogen + Oxygen → Water
• Mass given- Hydrogen = 4g, Oxygen = x g, Water = 36 g.
• According to the Law of conservation of Mass-
• Mass of reactants = Mass of products
• 4 g+ x g = 36 g
• x g = 36 g – 4 g
• x = 32 g.
• Hence, we can say that 32 g of oxygen was used.

Q10. On heating, 10.0 grams of sodium carbonate (Na 2 CO 3 ), 4.4 g of carbon dioxide (CO 2 ) and 5.6 g of sodium oxide (Na 2 O) is produced. Show that this reaction obeys the law of conservation of mass. Answer. Sodium Carbonate → Carbon dioxide + Sodium oxide Na 2 CO 3 → CO 2 +Na 2 O Mass given- Sodium carbonate = 10 g, Carbon dioxide = 4.4 g, sodium oxide = 5.6 g.

1. According to the Law of conservation of Mass-
2. Mass of reactants = Mass of products
3. Mass of reactant = 10 g

Mass of product = 4.4 + 5.6 = 10 g. Hence, this reaction obeys the law of conservation of mass. Q11. How much sodium carbonate is produced when 224.4 g of NaOH reacts with 88 g of CO 2 ? The reaction produces 36 g of water. Answer. Sodium Hydroxide + Carbon dioxide → Sodium carbonate + Water NaOH + CO 2 → Na 2 CO 3 + H 2 O Mass given- Sodium Hydroxide = 222.4 g, Carbon dioxide = 88g, Water = 36g.

• Let the mass of sodium carbonate be x grams.
• According to the Law of conservation of Mass-
• Mass of reactants = Mass of products
• Mass of Sodium Hydroxide + Mass of Carbon dioxide = Mass of Sodium carbonate + Mass of Water
• 222.4 g + 88 g = x g + 36 g
• x g = 276.4 g

276.4 g of sodium carbonate is produced when 224.4 g of NaOH reacts with 88 g of CO 2 along with 36 g of water. Q12. Silicon dioxide, which is composed of the elements silicon and oxygen, contains 46.7 percent silicon by mass. How much oxygen will 10 g of silicon combine with? Answer.100 g silicon dioxide contains 46.7 g silicon or 100 – 46.7 = 53.3 g oxygen.

1. Let the mass of oxygen be x grams.
2. According to the Law of conservation of Mass-
3. Mass of reactants = Mass of products

0.0976 g + x g → 0.1618 g x g = 0.0642 g Q14. A 15.5g thin strip of iron is immersed in a solution containing 21.0g of copper (II) sulphate, and copper begins to form. After a while, the reactions come to a halt because all of the copper (II) sulphate has reacted.

• Let the mass of iron sulphate be x grams.
• According to the law of conservation of mass,
• Mass of reactants = Mass of products
• Mass of iron + Mass of copper (II) sulphate = Mass of copper + Mass of iron (II) sulphate
• 7 g + 21 g = 8.6 g + x g
• x = 19.40 g

Therefore, 19.40 g iron (II) sulphate was formed. Q15. What is the ultimate source of energy if it cannot be created or destroyed? Answer. The Big Bang is the ultimate source of energy in our current universe. At the beginning of time, all energy was created, and as the universe expanded, several stages of particulate matter developed, produced from that energy.

## What is law of mass action Mcq?

MCQs On Law Of Mass Action for NEET 2022 Another peculiarity of the theoretical progress was that at first the law of mass action was known as the kinetic law of mass action. Furthermore, chemists were eager to identify a parameter that would clarify the compounds’ ability to react and shape the necessary products.

The reaction levels seemed to have such a parameter but it wasn’t that easy. The history of chemical discoveries which led to the formulation of the law of mass action is very important to understand the contemporary meaning of this rule. The empirically grounded principle that the frequencies of chemical reactions are proportional to the number of the active masses of reactants and is the kinetic law of mass action leads to the dynamic interpretation of chemical equilibrium, and hence to the law of mass action on equilibrium.1.

Which of the following is not correct?

the rate law is an experimental fact, but the law of mass action is theoretical the rate law is always different from the expression of the law of mass action the rate law is more informative than the law of mass action for the development of a mechanism the order of a reaction is equal to the sum of the powers of the concentration terms in the rate law.

Answer: (b) 2. The temperature coefficient of a reaction is 2. How many times the rate of reaction increases when the temperature is increased from 30 o C to 60 o C.

4 times 6 times 8 times 16 times

Answer: (c) 3. If a reaction with t 1/2 = 69.3 sec, has a rate constant 10 -2 per sec the order is Answer: (b) 4. K for a zero-order reaction is 2 x 10 -2 mole/L/sec. If the concentration of reactant after 25 sec is 0.5M, the initial concentration must have been Answer: (d) 5.

160 min 10 min 20 min 13 min 20 sec

Answer: (d) 7. Half-life of 10g of radioactive substance is 10 days. The half-life of 20 g is

10 days 5 days 20 days 40 days

Answer: (a) 8. The chemical reactions in which reactants need a high amount of activation energy are generally

fast slow very fast instantaneous

Answer: (b) 9. For a reaction A → Products the rate of reaction doubles when the concentration of A is increased by 4 times. The order of the reaction is Answer: (c) 10. The number of atoms or molecules whose concentration alters during a chemical change is its

molecularity order of reaction change in reaction none

Answer: (b) More on NEET Chemistry: : MCQs On Law Of Mass Action for NEET 2022

### Which of the following is the correct statement about mass of a body?

Which of the following statements about the mass of a body i Option 2 : It is same everywhere Free 10 Questions 10 Marks 10 Mins CONCEPT

Mass (m): It is the property of the physical body which defines the amount of matter it contains.

It is measured in kg /g /milligram etc.

Mass is the measure of the inertia of a body.

It is a scalar quantity and has only magnitude. Mass is a constant thing, it does not change anywhere in-universe. It is measured with Physical balance, beam balance, etc.

EXPLANATION

It does not change from place to place – Option 1 is incorrect.

Weight (W) can change from place to place, as it is a pull of gravity of the planet. The weight is different on different planets as gravity changes.

It is same everywhere – yes, mass is same everywhere – Option 2 is correct. It depends on its shape – No, mass does not depend on shape e.g.1 kg of cotton is of great size than of 1 kg of iron still, both masses are 1 kg – Option 3 is incorrect. It does not depend on temperature –

Density = (mass /volume) ⇒ mass = density × volume. Density of a substance depends on temperature. Temperature increases, density decreases and vice-versa So, mass depends on temperature – Option 4 is incorrect

∴ Option 2 is correct. Let’s discuss the concepts related to and Acceleration due to gravity of the earth. Explore more from here. Learn now! India’s #1 Learning Platform Start Complete Exam Preparation Daily Live MasterClasses Practice Question Bank Mock Tests & Quizzes Trusted by 3.5 Crore+ Students : Which of the following statements about the mass of a body i

#### Which of the following reactions is not correct according to law of conservation of mass?

Which of the following reactions is not correct according to the law of conservation of mass.14

Only in equation → ii), the reactants and products are not balanced. The unbalanced equation goes against the law of conservation of mass. The correct answer is → ii).

: Which of the following reactions is not correct according to the law of conservation of mass.

### Which of the following is the best example of the law of conservation of mass?

Which of the following is the best example of the law of conservation of mass? 12 g of carbon combines with 32 g of oxygen to form 44 g of carbon dioxide. Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses When 12 g of carbon is heated in a vacuum, there is no change in mass.

• No worries! We‘ve got your back.
• Try BYJU‘S free classes today! A sample of air increases in volume when heated at constant pressure but its mass remains unaltered.
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• Try BYJU‘S free classes today! The weight of a piece of platinum is the same before and after heating in air.

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## Which of the following statements is true regarding the Law of Conservation of Matter?

Which of the following statements is true about the law of conservation of mass? In a chemical reaction, matter is not created or destroyed, but is conserved. Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses In a chemical reaction, the final mass of the products is always greater than the starting mass of the reactants.

No worries! We‘ve got your back. Try BYJU‘S free classes today! In a chemical reaction, efforts should be made to preserve rare elements without changing them. No worries! We‘ve got your back. Try BYJU‘S free classes today! Matter can be created and destroyed but does not change forms. No worries! We‘ve got your back.

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#### Which equation is balanced according to the law of conservation of mass?

A balanced chemical equation always obeys law of conservation of mass. According to this law the mass of products must be equal to the mass of reactants. A reaction is said to be balanced when the total mass of atoms on both sides of the chemical reaction is equal.

#### Which of the following statement with express the law of conservation of momentum?

One of the most powerful laws in physics is the law of momentum conservation. The law of momentum conservation can be stated as follows. For a collision occurring between object 1 and object 2 in an isolated system, the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision. objects (a system ) is conserved – that is, the total amount of momentum is a constant or unchanging value. This law of momentum conservation will be the focus of the remainder of Lesson 2. To understand the basis of momentum conservation, let’s begin with a short logical proof.

## What is the statement of the law of conservation?

Law of conservation of energy The law of conservation of energy states that can neither be created nor destroyed – only converted from one form of energy to another. This means that a always has the same amount of, unless it’s added from the outside.

U_T is the total of a, U_i is the initial internal energy of a system. W is the done by or on the system. Q is the added to, or removed from, the system.

It is also possible to determine the change in internal energy of the system using the equation: \Delta U = W + Q This is also a statement of the, While these equations are extremely powerful, they can make it hard to see the power of the statement. The takeaway message is that energy cannot be created from nothing.

E is the amount of energy in an object or system. m is the mass of the object or system. c is the, roughly 3\times10^8 m/s,