A general belief is that all chemical reactions proceed to completion (where all reactants are converted into products). But this is not true in all cases.
- 1 Do all chemical reactions occur at the same time?
- 2 Do all reactions proceed at the same rate?
- 3 What conditions are necessary for a chemical reaction to occur?
- 4 How do chemical reactions proceed?
- 5 How do you distinguish the different types of chemical reactions?
- 6 What two conditions of reactants must be met for a reaction to proceed?
- 7 What remains the same during a chemical reaction?
- 8 What are the two conditions for a chemical reaction between reactant particles to successfully happen?
- 9 Why different reactions proceed at different speeds?
- 10 Is the ability of matter to combine chemically with other substances?
- 11 Which of the following observations is incorrect about the order of a reaction?
- 12 What composes a chemical reaction?
- 13 Why do different reactions have different rates?
- 14 How do you determine reaction order?
- 15 What is always equal before and after a chemical reaction?
- 16 How do substances change into different substances during chemical reactions?
- 17 Which of the following must be the same before and after a chemical reaction?
- 18 What is the difference between a chemical process and a physical process in chemistry?
- 19 How do you know if its a chemical reaction?
- 20 Are all chemical reactions endothermic or exothermic?
- 21 Can intermediates be observable?
- 22 Why do all chemical reactions require activation energy?
- 23 What are the three requirements for a reaction to occur according to the collision theory?
- 24 Why don t all chemical reactions occur at the same rate?
- 25 Which one of the following factors does not affect the rate of a chemical reaction?
- 26 What conditions cause the rate of one chemical change to differ from the rate of another?
- 27 Is the ability to react with other substances a physical property?
- 28 What are the factors that affect the chemical reaction?
- 29 Does not affect the rate of reaction?
- 30 What gas does not react with other substances?
- 31 Under what condition can chemical properties be observed?
- 32 How do exothermic and endothermic reactions differ?
- 33 Which of the following statements for order of reaction is not correct?
- 34 Which one of the following statements for the order of a reaction is incorrect a order of reaction is always whole number?
- 35 Which of the following statements for the order of a reaction is incorrect a order can be determined only experimentally?
- 36 What conditions must be met in order for a chemical reaction to occur?
- 37 Which changes are evidence of a chemical reaction?
- 38 Will not undergo a chemical reaction?
- 39 How do you determine order of reaction with respect to each reactant?
- 40 How do you determine order of reaction from concentration and time?
- 41 How is order of reaction Determination by Half Life method?
- 42 When a chemical reaction occurs the atoms remain the same but are?
- 43 What doesn’t change in a chemical reaction?
- 44 What is always equal on both sides of a chemical reaction?
- 45 Can substances change into different substances?
- 46 Can substances change into different substances yes or no?
- 47 How do new substances form in a chemical reaction?
- 48 Which of the following must be the same after a chemical reaction?
- 49 When a match burns some matter is destroyed?
- 50 What do all chemical reactions have in common?
- 51 How do substances change into different substances during chemical reactions?
- 52 Which processes are exothermic?
- 53 Which of the processes are endothermic?
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54
How are chemical and physical changes similar?
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54.1
Related Posts
- 54.1.1 Do chemical changes occur when existing bonds break and new bonds form?
- 54.1.2 Do chemical changes occur because of chemical reactions?
- 54.1.3 Do all chemical reactions result in the same change in energy?
- 54.1.4 Do chemical reactions always involve energy?
- 54.1.5 Do biochemical reactions happen on the cytoplasm?
- 54.1.6 Do endergonic reactions require activation energy?
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54.1
Related Posts
Do all chemical reactions occur at the same time?
Not all chemical reactions occur at the same rate. Some happen very quickly like explosions, while others can take a long time, like metal rusting. The speed that the reactants turn into products is called the reaction rate. The reaction rate can be changed by adding energy such as heat, sunlight, or electricity.
Do all reactions proceed at the same rate?
The Chemical Nature of the Reacting Substances
The rate of a reaction depends on the chemical nature of the participating substances. Reactions that appear similar may have different rates under the same conditions, depending on the identity of the reactants.
What conditions are necessary for a chemical reaction to occur?
conditions necessary for a chemical reaction are : 1- a minimum amount of energy 2-the molecules or atoms of the reactants must collide with one another 3- the speed of the reaction should be appreciable 4- the rate of reaction depends on: 1- temperature 2- presence of light 3- electricity 4- pressure .
How do chemical reactions proceed?
Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.
How do you distinguish the different types of chemical reactions?
- Synthesis reactions. Two or more reactants combine to make 1 new product. …
- Decomposition reactions. A single reactant breaks down to form 2 or more products. …
- Single-replacement reactions. A single element replaces a similar element of an adjacent reactant compound. …
- Double-replacement reactions.
What two conditions of reactants must be met for a reaction to proceed?
- Molecules must collide.
- Molecules must collide with enough energy to begin to break the old bonds so new bonds can form. ( Remember activation energy)
- Molecules must collide with the correct orientation.
What remains the same during a chemical reaction?
In a chemical reaction the total mass of all the substances taking part in the reaction remains the same. Also, the number of atoms in a reaction remains the same. Mass cannot be created or destroyed in a chemical reaction.
What are the two conditions for a chemical reaction between reactant particles to successfully happen?
Remember, a successful collision occurs when two reactants collide with enough energy and with the right orientation.
Why different reactions proceed at different speeds?
Reactions involve breaking of bonds of reacting species and forming of new bonds to give products. This process requires or releases energy. Since, different amounts of energies are involved in breaking and forming of different bonds, different reactions proceed with different speeds.
Is the ability of matter to combine chemically with other substances?
Reactivity is the ability of matter to combine chemically with other substances. Some kinds of matter are extremely reactive; others are extremely unreactive. For example, potassium is very reactive, even with water. When a pea-sized piece of potassium is added to a small amount of water, it reacts explosively.
Which of the following observations is incorrect about the order of a reaction?
1) order can be determined by experiment only. 2) order is not influenced by stoichiometric coefficient of the reactants. 3) order of reaction is the sum of power to the concentration terms of reactants to express the rate of reaction. 4) order of reaction is always a whole number.
What composes a chemical reaction?
chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
Why do different reactions have different rates?
Chemical reactions proceed at vastly different speeds depending on the nature of the reacting substances, the type of chemical transformation, the temperature, and other factors.
How do you determine reaction order?
Add the exponents of each reactant to find the overall reaction order. This number is usually less than or equal to two. For example, if reactant one is first order (an exponent of 1) and reactant two is first order (an exponent of 1) then the overall reaction would be a second order reaction.
What is always equal before and after a chemical reaction?
This law states that, despite chemical reactions or physical transformations, mass is conserved — that is, it cannot be created or destroyed — within an isolated system. In other words, in a chemical reaction, the mass of the products will always be equal to the mass of the reactants.
How do substances change into different substances during chemical reactions?
During a chemical change, substances change into one or more different substances. A produces new substances by changing the way in which atoms are arranged. In a chemical reaction, bonds between atoms are broken and new bonds form between different atoms.
Which of the following must be the same before and after a chemical reaction?
Answer: For any chemical reaction , the mass of the reactants before the reaction should be equal to the mass of products formed after the reaction .
What is the difference between a chemical process and a physical process in chemistry?
There is no fundamental difference between a chemical process and a physical process. This misleading distinction is made mainly by school teachers. For example, the melting of ice to liquid water is both a chemical and a physical process.
How do you know if its a chemical reaction?
- Color Change.
- Precipitate Formation (solid formation falling out of solution)
- Gas Formation (bubbles and odor)
- Temperature Change.
- pH Change.
Are all chemical reactions endothermic or exothermic?
All chemical reactions involve energy. Energy is used to break bonds in reactants, and energy is released when new bonds form in products. Endothermic reactions absorb energy, and exothermic reactions release energy. The law of conservation of energy states that matter cannot be created or destroyed.
Can intermediates be observable?
A reactive intermediate differs from a reactant or product or a simple reaction intermediate only in that it cannot usually be isolated but is sometimes observable only through fast spectroscopic methods.
Why do all chemical reactions require activation energy?
Each and every chemical reaction require some amount of activation energy to begin. The activation energy enables the reactants to move and overcome forces of repulsion. The subsequent collisions between atoms facilitates the breaking of existing bonds and the formation of new ones.
What are the three requirements for a reaction to occur according to the collision theory?
There are three important parts to collision theory, that reacting substances must collide, that they must collide with enough energy and that they must collide with the correct orientation.
Why don t all chemical reactions occur at the same rate?
A particular reaction can occur at different rates depending on the conditions. If you want a chemical reaction to happen faster, the particles of the reactants need to collide either more quickly or with more energy.
Which one of the following factors does not affect the rate of a chemical reaction?
Amount of product formed does not affect rate of reaction. This is because the rate only depends on the concentration of the products in a reaction. Molecularity of reactants does not affect the rate of the reaction.
What conditions cause the rate of one chemical change to differ from the rate of another?
Reactant concentration, the physical state of the reactants, and surface area, temperature, and the presence of a catalyst are the four main factors that affect reaction rate.
Is the ability to react with other substances a physical property?
No. The lack of ability to react with other Substances is a chemical property.
What are the factors that affect the chemical reaction?
- surface area of a solid reactant.
- concentration or pressure of a reactant.
- temperature.
- nature of the reactants.
- presence/absence of a catalyst.
Does not affect the rate of reaction?
Nature and concentration of the reactants and temperature of the reaction influence the rate of reaction. But molecularity does not affect the rate of reaction as it includes the number of atoms, ions or molecules that must collide with one another to result into a chemical reaction.
What gas does not react with other substances?
Helium is an inert gas that does not react with other substances to form compounds.
Under what condition can chemical properties be observed?
Under what conditions can chemical properties be observed? They can only be observed when the substances in a sample of matter are changing into different substances. Change in color, production of gas, formation of a precipitate.
How do exothermic and endothermic reactions differ?
An exothermic process releases heat, causing the temperature of the immediate surroundings to rise. An endothermic process absorbs heat and cools the surroundings.”
Which of the following statements for order of reaction is not correct?
The order of a reaction in the sum of the powers of molar concentration of the reactants in rate law expression. Out of the given four statements , option (c) is not correct. Order of reaction is equal to the sum of power of conentration of the reactants in rate law expression.
Which one of the following statements for the order of a reaction is incorrect a order of reaction is always whole number?
Explanation : Order of a reaction is not always whole number. It can be zero, or fractional also.
Which of the following statements for the order of a reaction is incorrect a order can be determined only experimentally?
The order of a reaction is experimentally determined. order is the sum of the powers to which the concentration of reactants is raised in a rate law expression. Therefore, options A, B, and D have correct statements. And option C is an incorrect statement.
What conditions must be met in order for a chemical reaction to occur?
Answer: Molecules must collide with sufficient energy, known as the activation energy, so that chemical bonds can break. Molecules must collide with the proper orientation. A collision that meets these two criteria, and that results in a chemical reaction, is known as a successful collision or an effective collision.
Which changes are evidence of a chemical reaction?
The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.
Will not undergo a chemical reaction?
Answer. Inert gas or noble gas is a gas which does not undergo chemical reactions under a set of given conditions.
How do you determine order of reaction with respect to each reactant?
The overall reaction order is the sum of the orders with respect to each reactant. If m = 1 and n = 1, the overall order of the reaction is second order (m + n = 1 + 1 = 2).
How do you determine order of reaction from concentration and time?
Take three consecutive points from the concentration versus time data. Calculate ΔyΔx for the first and second points. The concentration is the y value, while time is the x value. Do the same for the second and third point.
How is order of reaction Determination by Half Life method?
time (s) | [A] (M) |
---|---|
20 | 0.600 |
30 | 0.480 |
40 | 0.400 |
50 | 0.343 |
When a chemical reaction occurs the atoms remain the same but are?
In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
What doesn’t change in a chemical reaction?
The law of conservation of mass states that in a chemical reaction mass is neither created nor destroyed. For example, the carbon atom in coal becomes carbon dioxide when it is burned. The carbon atom changes from a solid structure to a gas but its mass does not change.
What is always equal on both sides of a chemical reaction?
Every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. Therefore, there must be the same number of atoms of each element on each side of a chemical equation.
Can substances change into different substances?
During a chemical change, substances are changed into different substances. Another words, the composition of the substance changes. How can you tell whether a change is a chemical change? If you think you are unfamiliar with chemical changes, think again.
Can substances change into different substances yes or no?
This means that one substance with a certain set of properties (such as melting point, color, taste, etc) is turned into a different substance with different properties. Chemical changes are frequently harder to reverse than physical changes. One good example of a chemical change is burning a candle.
How do new substances form in a chemical reaction?
In a chemical change, new substances are formed. In order for this to occur, the chemical bonds of the substances break, and the atoms that compose them separate and rearrange themselves into new substances with new chemical bonds. When this process occurs, we call it a chemical reaction.
Which of the following must be the same after a chemical reaction?
What of the following MUST be the same before and after a chemical reaction? The total mass of the reactants and total mass of the products.
When a match burns some matter is destroyed?
Burning and other changes in matter do not destroy matter. The mass of matter is always the same before and after the changes occur. The law of conservation of mass states that matter cannot be created or destroyed.
What do all chemical reactions have in common?
Answer: The characteristics of a chemical reaction are: Evolution of gas, Formation of a precipitate, Change in colour, Change in temperature, Change in state etc.
How do substances change into different substances during chemical reactions?
During a chemical change, substances change into one or more different substances. A produces new substances by changing the way in which atoms are arranged. In a chemical reaction, bonds between atoms are broken and new bonds form between different atoms.
Which processes are exothermic?
- Combustion of fuels such as wood, coal and oil/petroleum.
- The thermite reaction.
- The reaction of alkali metals and other highly electropositive metals with water.
- Condensation of rain from water vapor.
- Mixing water and strong acids or strong bases.
- The reaction of acids and bases.
Which of the processes are endothermic?
In thermochemistry, an endothermic process is any process with an increase in the enthalpy H (or internal energy U) of the system. In such a process, a closed system usually absorbs thermal energy from its surroundings, which is heat transfer into the system.
How are chemical and physical changes similar?
Physical and chemical changes are alike because they are both types of changes that can occur in various forms of matter.