Do chemical reactions occur at the same rate?

Do chemical reactions occur at the same rate?

Chemical reactions don’t all occur at the same rate. Some, like explosions, are very fast. Others, like the rusting of iron in air, are slow. A particular reaction can occur at different rates depending on the conditions.

Does size of reactants affect reaction rate?

Increasing the surface area of a reactant increases the frequency of collisions and increases the reaction rate. Several smaller particles have more surface area than one large particle. The more surface area that is available for particles to collide, the faster the reaction will occur.

What is true about the rate of a chemical reaction?

The reaction rate or rate of reaction is the speed at which a chemical reaction takes place, defined as proportional to the increase in the concentration of a product per unit time and to the decrease in the concentration of a reactant per unit time. For most reactions, the rate decreases as the reaction proceeds.

When a chemical reaction and its reverse occur at the same time and rate the reaction is said to be in?

A reversible reaction is in when forward and reverse directions of the reaction occur at the same rate so there is no overall change in the amounts of reactants and products. Irreversible chemical reactions can occur in only one direction.

Why do smaller particles have a larger surface area?

It means that the surface area to volume ratio increases as the radius of the sphere decreases and vice versa. Therefore, materials made of nanoparticles have a much greater surface area per unit volume ratio compared with the materials made up of bigger particles.

How does the rate of a reaction depends on the size of the?

Answer: By decreasing the particle size of a reactant, we are increasing its surface area. The greater the surface area, the higher the chance of collisions, thus the faster the rate of reaction. The smaller the particle size the faster the reaction.

Which is true of any chemical reaction?

During a chemical change, the composition of matter always changes. Four possible clues to chemical change include a transfer of energy, a change in color, the production of a gas, or the formation of a precipitate. During any chemical reaction, the mass of the products is always equal to the mass of the reactants.

How do you determine the rate of a chemical reaction?

Reaction rate is calculated using the formula rate = Δ[C]/Δt, where Δ[C] is the change in product concentration during time period Δt. The rate of reaction can be observed by watching the disappearance of a reactant or the appearance of a product over time.

What happens to the rate of a chemical reaction at higher temperatures?

E) At higher temperatures, a catalyst is usually present. D) The increased concentration of the reactants increases the frequency of effective collisions. The rate of a chemical reaction increases with an increase in concentration of one or more of the reactants. This is best explained by which of the following statements?

Which is always greater than the change in enthalpy?

The Activation energy, Ea, will always be greater than the change in enthalpy, (change in H) Which of the following statements about chemical reaction rates is true? -Sometimes changing the concentration of a reactant has no effect on the reaction rate for a net chemical reaction.

What type of reaction occurs when a cold pack is activated?

When a cold-pack is activated, a chemical reaction occurs and the temperature of the pack contents drops sharply. Which of the following is a correct description of the reaction occurring in the pack? The reaction is exothermic; H° > 0. The reaction is exothermic; H° < 0.

Is metal rusting a physical or chemical change?

Metal rusting is an example of a chemical change. Nice work! You just studied 150 terms! Now up your study game with Learn mode. True or false? The normal boiling point of water is 100 degrees celsius, which is a physical property of the substance water. True or false? Metal rusting is an example of a chemical change.