Quick Answer: Which Best Explains Why Sawdust Burns More Quickly?

What makes a reaction reversible?

Reversible Reactions After products are formed, the bonds between these products are broken when the molecules collide with each other, producing sufficient energy needed to break the bonds of the product and reactant molecules.

If the reactants are formed at the same rate as the products, a dynamic equilibrium exists..

What are the 4 ways to speed up a chemical reaction?

Reaction RatesThe concentration of the reactants. The more concentrated the faster the rate.Temperature. Usually reactions speed up with increasing temperature.Physical state of reactants. … The presence (and concentration/physical form) of a catalyst (or inhibitor). … Light.

Which describes a way to speed up the collisions between hydrogen and oxygen?

Which describes a way to speed up the collisions between hydrogen and oxygen molecules to produce more water? Use a less-intense source of heat on the reactants.

What does the equilibrium constant expression depends on?

The value of the equilibrium constant for any reaction is only determined by experiment. … It does, however, depend on the temperature of the reaction. This is because equilibrium is defined as a condition resulting from the rates of forward and reverse reactions being equal.

How does a catalyst speed up a reaction?

A catalyst is a substance that can be added to a reaction to increase the reaction rate without getting consumed in the process. Catalysts typically speed up a reaction by reducing the activation energy or changing the reaction mechanism. Enzymes are proteins that act as catalysts in biochemical reactions.

What equilibrium constant tells us?

The equilibrium constant can help us understand whether the reaction tends to have a higher concentration of products or reactants at equilibrium. We can also use K c K_\text c Kc​K, start subscript, start text, c, end text, end subscript to determine if the reaction is already at equilibrium.

Which reaction is the fastest?

Reactions in phases that easily mix, such as gases and liquids, occur much faster than reactions between solids. The extent of mixing of the reactants influences the frequency of molecular collisions – if reactants are more thoroughly mixed, the molecules will collide more often and thus react faster.

Why does equilibrium constant change with temperature?

Changing temperature Increasing the temperature decreases the value of the equilibrium constant. Where the forward reaction is endothermic, increasing the temperature increases the value of the equilibrium constant. The position of equilibrium also changes if you change the temperature.

Which three factors affect the rate of a chemical reaction?

There are four main factors that can affect the reaction rate of a chemical reaction:Reactant concentration. Increasing the concentration of one or more reactants will often increase the rate of reaction. … Physical state of the reactants and surface area. … Temperature. … Presence of a catalyst.

Does adding a catalyst increase the rate of reaction?

The rate of a reaction can be increased by adding a suitable catalyst. A catalyst is a substance which increases the rate of a chemical reaction but it is not used up (remains chemically unchanged at the end). It provides an alternative reaction pathway of lower activation energy.

Which best explains why sawdust burns more quickly than a block of wood equal mass under the same conditions?

Which best explains why sawdust burns more quickly than a block of wood of equal mass under the same conditions? … The pressure of oxygen is greater on the sawdust. More molecules in the sawdust can collide with oxygen molecules. Oxygen is more concentrated near the sawdust than the block of wood.

What will happen to the chemical equilibrium of AgNO3 is added?

What will happen to the chemical equilibrium if AgNO3 is added? The chemical equilibrium of the system shifts to the left. … The equilibrium will shift to the left to favor the reverse reaction.

Which of the following best explains why most chemical reactions proceed more quickly when the concentrations of reactants are increased?

Answer Expert Verified Because you increase the concentration of the reactants, it means that there are more molecules of the reactants present in a smaller amount of space. This being the case, there is a higher chance that these molecules will collide with enough energy to overcome the activation barrier.

Which of the following best explains why an increase in temperature increases the rate of a reaction?

Temperature increases the kinetic energy of the molecule and hence more collision between molecules will takes place as velocity or particles gets increased hence reaction rate will increases.

What are 5 factors that affect reaction rate?

Five factors typically affecting the rates of chemical reactions will be explored in this section: the chemical nature of the reacting substances, the state of subdivision (one large lump versus many small particles) of the reactants, the temperature of the reactants, the concentration of the reactants, and the …

Which chemical reaction is the fastest?

Ultra-fast Chemical Reaction that Turns Graphene into Semiconductors. German and US scientists recently reported an unusual feat: they observed the world’s fastest chemical reaction, during which hydrogen atoms bind onto and then leave a sheet of graphene, all within ten quadrillionths (10^-14) of a second.

Which does not affect the rate of reaction?

Solution : The enthalpy change, ΔH is difference of energy between reactant and product molecules.

What will happen to the chemical equilibrium if MgCl2 is added?

What will happen to the chemical equilibrium if MgCl2 is added? The chemical equilibrium of the system will be unaffected. The chemical equilibrium of the system will shift to the right to favor the forward reaction.

Which situation would cause a reaction to occur more quickly?

Chemical reactions typically occur faster at higher temperatures. Food can spoil quickly when left on the kitchen counter. However, the lower temperature inside of a refrigerator slows that process so that the same food remains fresh for days.

What is true equilibrium?

The equilibrium state is one in which there is no net change in the concentrations of reactants and products. … Nothing could be further from the truth; at equilibrium, the forward and reverse reactions continue, but at identical rates, thereby leaving the net concentrations of reactants and products undisturbed.

How do you know if a reaction is slow or fast?

In a reaction with a slow initial step, the rate law will simply be determined by the stoichiometry of the reactants. In a rate law with a fast initial step, no intermediates can appear in the overall rate law.