7.9 Energy in Chemical Reactions

Oxygen gas, the HNO3 and nitrogen oxide react with solid lead(II) sulfide.

To form aluminum oxide, aluminum oxidizes.

The reactants have to collide with each other in order to conduct a chemical reaction.

When a collision has the proper orientation, there must be enough energy to break the bonds of the reactants.
The molecule bounce apart without reacting if the energy of the collision is less than the activation energy.
Only a few of the many accidents lead to the formation of product.

Climbing over a hill is similar to the concept of activation energy.

We must climb to the top of the hill to reach the other side.
We can run down the other side once we are at the top.
The activation energy is needed to get us from our starting point to the top of the hill.

The reactants have to collide.

The reactants have to align to form bonds.

The energy of the collision must come from the collision.

As reactants are converted to products, heat is absorbed or released.

In exothermic reactions, heat is released.
In the thermite reaction, the reaction of aluminum and iron(III) oxide produces so much heat that temperatures can be reached.
The thermite reaction can be used to cut railroad tracks.
The heat of reaction is written on the same side as the products in the equation.

The energy needed to convert reacting molecule into products is called the activation energy.

In endothermic reactions, heat is absorbed.

When hydrogen and iodine react to each other, heat must be absorbed.
The heat of reaction is written on the same side as the reactants in the equation.

One mole of NH4NO3 absorbs 26 kJ of heat.

A cold pack that is ready to use is given a temperature of 4 to 5 degrees.

A hot pack has the same salt as a cold pack.

When 1 mole of CaCl2 is dissolved in water, 82 kJ are released as heat.

Reactions with low activation energies are quicker than reactions with high activation energies.

Chemical quantities and reactions are very fast.

The rate is affected by temperature, concentration of reactants, and the addition of catalysts.

The increase in energy of the reactants at higher temperatures makes them move faster and collide more often.

At higher temperatures, reactions go faster.
We raise the temperature if we want food to cook faster.
The pulse rate, rate of breathing, and metabolism increase when the body temperature increases.
We slow down a reaction by lowering the temperature.
We keep food refrigerated to make it last longer.
In some cardiac surgeries the body temperature is lowered so the heart can be stopped and less oxygen is required by the brain.
Some people have survived submersion in icy lakes for long periods of time.

When reactants are added, the rate of a reaction increases.

It is possible to speed up a reaction by lowering the energy of activation.

We discussed how much energy is required to climb a hill.
We don't need as much energy to get to the other side if we find a tunnel through the hill.
An alternate pathway with a lower energy requirement is provided by a catalyst.
More collisions form product successfully.
There are many uses for catalysts in industry.
The reaction of hydrogen with vegetable oils is very slow in margarine production.
The reaction occurs quickly when finely divided Platinum is present as a catalyst.
The body's biocatalysts make most metabolism reactions proceed at the appropriate rates.

The reaction occurs at a faster rate.

The energy of the carbon dioxide gas produced is lower than the energy of the reactants.

The balanced equation should be written for the reaction.

The rate of the reaction will change if there is an increase in the number of O2 molecule.

The reaction is exothermic when the products have a lower energy than the reactants.

The rate of the reaction will increase if there is an increase in the number of O2 molecules.

A reaction is released.

The body has a metabolism that provides energy.

In the body, energy is required for the synthesis of proteins.

125 kJ is absorbed by a reaction.

The test results are low.

She has a blood oxygen level that is too low and she has a dry cough.

A lack of oxygen causes her to lose strength due to a reaction with oxygen gas.

Write and balance the chemical equation for the human body.

In plants, carbon dioxide gas and liquid water are converted to a liquid called C6H12O6.

Balance the chemical equation for the production of sugar in plants.

When used at the beginning of energy in the body, low-intensity exercises are gaseous carbon dioxide and liquid water.

Write and balance the equation for the burning of the fatty acid.

Balance the equation for the burning of the myristic acid, C14H28O2.

The number of a substance is determined by the chemical formula number.

One mole of an element is the mass in grams equal to its 1023 atoms; 1 mole of a com atomic mass, or the sum of the atomic mass, is the pound.

The mole-mole factor can be converted between grams and moles using the molar mass.

Write the total mass of the products.

A balanced factor is used to find moles in a reaction.

If the mass in grams react on the left side of a reaction arrow and the products that form of a substance in a reaction, calculate on the right side of the reaction arrow.

Pick out the grams of a different substance.

The rate of a reaction can be affected by factors such as bination, decomposition, single replacement, and double replacement.

Define the reactants.

The rate of a reaction is the speed at which the reactants are con in a reaction.

One reactant loses electrons and another gains electrons as a result of increasing the concentrations of reactants.

The number of electrons lost and gained is the same.

A shorthand way to represent a chemical reaction.

The number of items in a mole is equal to the number of coefficients.

The final form of a chemical equation shows the number of atoms or moles of atoms of each element on the same number of atoms of each element in the reactants and both sides of an equation.

A substance increases the rate of reaction by lowering bine.

A group of atoms, molecules, or formula units that contains carbon and hydrogen reacts with oxygen to produce CO2, H2O, 6.02

A reaction in which a single reactant splits two compounds.

The addition of oxygen or the loss of hydrogen is a reaction in which the positive ion is involved.

The energy of one reactant is always accompanied by the reduction of another, the products are higher than the energy of the reactants.

The substances were formed from a chemical reaction.

The group of ion is represented by a formula.

Losing oxygen or gaining hydrogen may be involved in the mass in grams of 1 mole of an equal element.

An element is equal to the sum of the elements in a formula.

Molar mass is used as a conversion factor to convert between moles.

The frame of a bicycle has a mole of carbon for every 1023 atoms of aluminum.

Avogadro's number is used to convert between particles Equality: 1 mole of Al is equal to 26.98 g of Al and moles.

The atoms on the reactant side are compared with the subscript in the formula.

To balance the equation, we need to use coefficients.

Place a 4 in front of the formula H2O to give 8 H atoms and 4 O atoms in the reactants.

The equation is balanced.

Chemical reactions are classified by identifying general patterns in two substances as follows: their equations.

A mole factor is used to convert the number of moles of compounds switch places.

How much energy is needed to produce 2O.

This is a single replacement reaction.

Use the mass of A to convert the mass, in grams, of A to is oxidation and the reactant that is reduced: moles of A.

The mass, in grams, of B, can be calculated using the molar mass of B.

Fe loses electrons.

The amount of O2 needed to react Cu2+ is reduced.

To form 2 moles of Na2O, you need 3 SFs.

What is the mass of dipyrithione?

Dandruff contains dipyrithione.

Ibuprofen is anti- inflammatory.

When ammonia (NH3) gas reacts with fluorine gas, the gaseous combination, decomposition, single replacement, and double products are dinitrogen tetrafluoride (N2F4) and hydrogen fluo replacement.

A compound breaks apart.

Iron(II) oxide and sulfur dioxide are broken down.

The acid rain and nitrogen oxide gas can be caused by the equation for the formation of thesiloxane from with water in the air.

Carbon dioxide and water gases are produced by the burning of propane gas.

The density of propane is 2.02 g/L.

There are problems related to the topics in this chapter.

In the presence of yeast, grapes undergo fermenta tion to produce alcohol and carbon dioxide.

Benzyl alcohol reacts with sodium to produce hydrogen and salt.

Classify the reaction as a combination reaction.

The amount of sodium required to react is calculated.

How many grams of the substance would be formed.

Gasohol is a fuel that burns oxygen gas to give carbon dioxide and water gases.

Ammonium sulfate is used in the production of carbon dioxide nitrogen for the soil.

How many formula units are there?

The heat of reaction should be included in the equation.

The zinc is reduced.

Cl2 is reduced and the br- in NaBr is oxidation.

The O2 and Pb2+ in PbO are different.

Fe3+ is reduced.

Olefin gains hydrogen atoms.

The products have lower energy than the reactants.

How much CO2 is consumed in a day.

At higher temperatures, reactions go faster.

She was seen by a gas in the emergency room after her father took gases containing N2 and O2 from her.

Whitney had difficulty getting a respiratory therapist who listened to her chest and oxygen, so Sam gave her supplemental oxygen through a spirometer.
The mask is based on oxygen.
Whitney was on her limited breathing capacity and the wheezing noise in breathing returned to normal within a short period of time.
Whitney was diagnosed with asthma after the therapist explained her chest.

However, to enter the lungs.

The amount of oxygen in her blood is measured during the breathing treatment and it becomes more difficult to expand the volume of her lungs.

Premature infants whose lungs have not developed and asthmatics are some of the patients that respiratory therapists assess and treat.

In assessing patients, they perform a variety of diagnostic tests including breathing capacity and concentrations of oxygen and carbon dioxide in a patient's blood.

Oxygen or aerosol medications are provided to the patient, as well as chest physiotherapy to remove mucus from their lungs, in order to treat them.
Respiratory therapists teach patients how to use their inhalers.

Whitney's doctor prescribed a medication that opens up her airway before she starts exercising.