According to the question, Equivalent volume of any gas at STP is 22.4 litre. So, Equivalent volume of hydrogen, will be 22.4 litre. Equivalent wt. of metal= 0.025gm
What is the purpose of hydrogen?Hydrogen may be utilized to heat our dwellings and places of business in addition to powering vehicles and producing electricity. To reach net zero, it will be crucial to reduce our carbon emissions significantly.
Where can you find hydrogen?The majority of stars and the sun include it, and the planetary Jupiter is primarily made of it. Less than consistent with similar per million per volume is all that is found when it is a gas present in the air.
Equivalent wt. of metal/Weight of metal =moles of [tex]H_{2}[/tex] ×valency factor
Equivalent wt. of metal/ 1.017 g = (0.28 L/22.4 L) ×2
Equivalent wt. of metal= 0.025gm
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A solution containing 0.050 g of an unknown nonelectrolyte in 2.50 g of cyclohexane was found to freeze at 5.1 °C. What is the molar mass of the unknown substance? Show your work.
The molar mass of the non-electrolyte solute is 285.7 g/mol.
What is the freezing point of cyclohexane?The freezing point of cyclohexane is 6.6°C
The freezing point depression, ΔT, of hexane by the unknown non-electrolyte will be:
ΔT = 5.1 - 6.6
ΔT = 1.5 °C
Recall that ΔT = iKfm
where;
i is the vant Hoff's constanmt for the non-electrolyteKf is the molal freezing point depression constantm is the molality of the solutionFor the solution:
i = 1
Kf for cyclohexane = 20.2 deg⋅kg/mole of solute
m = ?
m = ΔT/iKf
m = 1.5/1 * 20.2
m = 0.07 molal
Molality = moles of solute/mass of solvent in kg
mass of solvent = 2.50 g or 0.0025 kg
moles of solute = 0.07 * 0.0025
moles of solute = 0.000175 moles
0.050 g of the non-electrolyte = 0.000175 moles
Molar mass of the non-electrolyte = 0.05/0.000175
Molar mass of the non-electrolyte = 285.7 g/mol
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A pharmacy technician measures the mass of a pill. The mass of one pill is 697 mg. What is the mass in kilograms of 100 pills? Write your answer as a decimal
The mass in kilograms of 100 pills is equal to 0.0697 kilograms.
What is a conversion factor?In Science, a conversion factor can be defined as a number that is typically used to convert (change) a number in one (1) set of units to another, either by dividing or multiplying.
Generally speaking, an appropriate conversion factor to an equal value must be used when it is necessary to perform any mathematical conversion.
Conversion:
1 pill = 697 milligrams.
100 pills = X milligrams.
Cross-multiplying, we have:
Mass of X in milligrams (mg) = 697 mg × 100 pills
Mass of X in milligrams (mg) = 69700 mg.
Next, we would convert the unit of mass in milligrams (mg) to kilograms (kg) by dividing it with a conversion factor of 1 × 10⁶ as follows;
Mass of X in kilograms (kg) = 69700/(1 × 10⁶)
Mass of X in kilograms (kg) = 0.0697 kilograms.
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arrange tha following substances in order of increasing boiling point and increasing solubility in water. -2-butanol ,-2-propanol,-2-methylpropane, -2-pentanol
Answer:
Here is the order of increasing boiling point and increasing solubility in water for the substances you listed:
-2-Methylpropane < -2-butanol < -2-pentanol < -2-propanol
Explanation:
-2-Methylpropane has the lowest boiling point and is the least soluble in water.
-2-butanol has a higher boiling point than -2-methylpropane, but lower than -2-pentanol and -2-propanol
-2-pentanol has a higher boiling point than -2-butanol and -2-methylpropane, but lower than -2-propanol
-2-propanol has the highest boiling point and is the most soluble in water.
Please note that this is a general trend and there can be variations depending on factors such as pressure, purity of the substance, and temperature.
What mass of NaNO3 should be dissolved in 400 g of water to prepare a 20% solution?
Mass of NaNO3 should be dissolved in 400 g of water is 100 g
It is given that
Mass of water = 400 g
percent of solution = 20% solution
mass of NaNO3 = ?
Mass per cent is a way of expressing a concentration or describing the component in a particular mixture. The solution composition can be described in mass percentage which shows the mass of solute present in a given mass of solution. The quantity of solute is expressed in mass or by moles.
Mass percentage of solution = mass of solute/mass of solution
20% = mass of NaNO3/mass of NaNO3 + 400g
20/100 = x/x + 400
0.2(x + 400) = x
0.2x + 80 = x
0.8x = 80
x = 100 g
Hence, Mass of NaNO3 should be dissolved in 400 g of water is 100 g
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What is the product of the unbalanced equation below?
Ca(s) + O2(g)
A. CaO2(5)
B. Cao(s)
C. 2Ca(s) + O2(9)
D. Ca20(s)
B. Cao(s) (Calcium oxide)
The balanced equation would be:
Ca(s) + O2(g) --> Cao(s)
It is the product of Calcium oxide.
What is the product of the reaction between sodium and chlorine?The product of the reaction between sodium and chlorine is sodium chloride (NaCl). When sodium (Na) and chlorine (Cl) react, they form an ionic bond, with the sodium atom losing one electron to the chlorine atom. This forms a positively charged sodium ion (Na+) and a negatively charged chloride ion (Cl-), which are held together by electrostatic attraction to form the compound sodium chloride. It is a white crystalline solid and is commonly known as table salt.
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Which weighs more, a mole of lead or a mole of helium?
The mass of one mole of lead is 207.2 g and that of helium is just 4 g/mol. Therefore, a mole of lead weighs more than a mole of helium.
What is one mole ?A mole is a unit of measurement that represents the amount of substance in a sample. One mole of any substance contains the same number of particles, which is known as Avogadro's number (6.022 x 10²³ particles per mole). Mass of one mole of an element is called its atomic mass.
The atomic mass of lead is 207.2 g/mol, which means that one mole of lead has a mass of 207.2 grams. The atomic mass of helium is 4.0 g/mol, which means that one mole of helium has a mass of 4.0 grams.
Therefore, a mole of lead weighs more than a mole of helium, since the molar mass of lead is much greater than that of helium.
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A gold bullion dealer advertised a bar of pure gold for sale. The gold bar had a mass of 3300 g and measured 2.00 cm x 15.0 cm x 6.00 cm. Calculate the density of the bar. Was the bar pure gold? (Hint: The density of pure gold is 19.3 g/cm3)
The denstiy of the gold bar of mass 3300 g is 18.3 g/cm³.
What is density?Density is the ratio of mass and volume.
To calculate the density of the bar gold, we use the formula below.
Formula:
D = m/lwh........................ Equation 1Where:
D = Densitym = Massl = Lengthw = Widthh = HeightFrom the question,
Given:
m = 3300 gl = 2 cmw = 15 cmh = 6 cmSusbtitute these values into equation 1
D = (3300)/(2×15×6)D = 18.3 g/cm³The bar is not a pure gold.
Hence, the denstiy is 18.3 g/cm³.
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What mass of HNO3 was contained in the solution if 35
cm3. of 0,4 N was required to neutralize it? NaOH solution?
What is the titer of a NaOH solution?
(Answer: 0,882 g, 0,016 g/
cm³.)
The mass of the HNO3 solution was found to be 0.882 g and the titer of the NaoH solution was 0.016g/cm^3.
what was NaoH ?
The inorganic chemical sodium hydroxide, widely known as lye and caustic soda, has the formula NaOH. It is a white solid ionic compound that contains sodium cations Na+ and hydroxide anions OH.
Sodium hydroxide is a caustic base and alkali that degrades proteins at room temperature and can inflict serious chemical burns. It collects moisture and carbon dioxide from the air and is extremely soluble in water. It creates a succession of NaOHnH2O hydrates. Between 12.3 and 61.8 °C, the monohydrate NaOHH2O crystallises from water solutions. This monohydrate is frequently used in commercially available "sodium hydroxide," and published data may refer to it instead of the anhydrous component.
As one of the most basic hydroxides, sodium hydroxide is commonly employed in conjunction with neutral water.
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6. Fill in the two blanks with the appropriate terms: Given this food chain: Organism A- organism B Organism C- Organism D Organism D is considered________ and it is in the__________
There are two different kinds of food chains: the detrital food chain, which starts with dead organic matter, and the grazing food chain, which starts with autotrophs.
What is a food chain in answer?A food chain is a list of living things that convey nutrients and energy from one creature to the next as they consume one another. Each organism in a food chain is classified into a distinct trophic level according to the number of energy exchanges that separate it from the chain's primary energy source.A food chain is a linear arrangement of creatures that represents producers to top consumers or trophic levels, through which nutrients and energy are transferred when one organism consumes another.A primary consumer consumes a producer at the start of the food chain. A secondary consumer, who in turn may be eaten by a tertiary consumer, may be the primary consumer.To learn more about food chain refer to:
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Which has more moles in the sample: a sample of 0.2 moles of KI or a sample of 3.2x102^3 atoms of MgO? MUST SHOW WORK
3.2x10^23 atoms of MgO would have more number of moles as shown.
What is the number of moles?We know that the number of moles is a concept that we can be able to glean from Avogadro. The idea of mole has to do with the amount of substance that contains the same number elementary entities as what we have in carbon 12.
We have been told that we are to compare 0.2 moles of KI and then we also look at 3.2x10^23 atoms of MgO. We would then have to find the number of moles that we are going to have in the 3.2x10^23 atoms of MgO as we have written here.
If 1 mole contains 6.02 * 10^ 23 atoms
x moles would contain 3.2x102^3 atoms
x = 1 mole * 3.2x10^23 atoms/ 6.02 * 10^ 23 atoms
x = 0.53 moles
Hence the number of moles in the KI is less than that in the MgO.
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Determine the average density if the results for three trials were: 3.5512 g/mL, 3.4188 g/mL and
3.8617 g/mL.
Answer:
3.6106 g/mL (approx.)
Explanation:
Average density = Sum of all densities/ Number of Densities
Which is, (3.5512 + 3.4188 + 3.8617)/3
≈ 3.6106 g/mL
Here is a list of synonyms for the two meanings of the word initiate. Think about what each word
means and decide where it belongs in the graphic organizer below.
admit
begin
commence
create
pledge
recruit
launch
welcome
► Now write these synonyms for initiate under the correct definition in the graphic organizer.
1. To put into effect; to bring into use.
2. To take in as a member.
Synonyms of "Initiate" that belong to graphic organizer is given below.
1. To put into effect; bring into use.
• begin
• commence
• create
• launch
2. To take in as a member.
• admit
• pledge
• recruit
• welcome
What is graphic organizer?A graphical organizer, also known as a knowledge map, concept map, story map, cognitive organizer, advanced organizer, or concept diagram, is an educational tool that uses visual symbols to represent knowledge and concepts through the relationships between them.
Graphic organizers help you visualize and build ideas, organize and order information, plan what to write, improve reading comprehension, brainstorm, organize problems and solutions, compare and contrast ideas, and show cause and effect. etc., can be supported.
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Which examples are an abiotic factor of an aquarium ecosystem? Select all that apply.
rock structure
amount of algae on the glass
temperature of the water
number of fish
Answer:
a. amount of algae on the glass
Explanation:
Physical and chemical circumstances are examples of abiotic elements, which are ecosystem components that are not alive. Because they are non-living and affect the ecosystem's characteristics, the rock composition, the quantity of algae on the glass, and the water temperature are all examples of abiotic elements in an aquarium environment.
Although the quantity of fish is a biotic element since it is a live organism and a component of the ecosystem.
Which of the following channels in the active zones of the synaptic terminal open when the membrane depolarizes and causes the release of synaptic vesicles?
A. Potassium channels
B. Voltage-gated sodium channels
C. Voltage-gated calcium channels
D. Sodium channels
Voltage-gated calcium channels in the active zones of the synaptic terminal open when the membrane depolarizes and causes the release of synaptic vesicles.
The active zone of neurones is a site on the motor nerve terminal of the neuron and this site the synaptic vesicles fuse with the cell membrane of neurones for release the contents of the synaptic vesicle. The release of contents from synaptic vesicles are through voltage-gated Calcium channels. This channels are opens when a membrane is depolarization for release of vasicles that are in synapse.
This channel also called Presynaptic Ca2+ channel and calcium ion entry into the active zone and this happens because of voltage-gated Ca2+ channels are activated when membrane depolarization occurred. and release neurotransmitter from synaptic vesicles.
Hence, option C is correct.
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6. Write the mole ratios for the reaction of hydrogen gas and oxygen gas, 2H₂(g) + O₂(g) → 2H₂O. Make a sketch of six hydrogen molecules reacting with the correct number of oxygen molecules. Show the water molecules produced.
Answer:
hi there in this question. We are given the balanced equation for the reaction of water from hydrogen gas and oxygen gas. And the first thing we want to know is the mole ratio for this reaction. So we get the mole ratio from the coefficient in the balanced equation. And if there's not a coefficient written, it's understood that it's a one. So that means our mole ratio here is going to be two moles of hydrogen. Because coefficient is two Reacts with one mole of oxygen because its coefficient is one to produce two moles of the water. And we know it's a two because its coefficient as a two. Alright, so this would be the mole ratios for these, The hydrogen and oxygen react in a 2-1 ratio, producing two moles of the water. Alright, so now we want to sketch what's going to happen here if we start with six hydrogen molecules and the correct number of oxygen molecules. So our hydrogen molecules six of those remember their H two. So that would just be one hydrogen molecule that I just drew there. These are gasses. So they're going to be randomly spaced, moving around. There's three, there's 4. Here's five and six. All right, so, we know these react in a 2-1 ratio. So for every six of these We would only need half as many or three of the 02s. So here's one oxygen molecule. Again, this is a diatonic also. So each molecule is composed of two oxygen atoms. Alright, So we have that reacting with that. And when these combined we are going to get six water molecules and we know that because we started with six hydrogen and looking at our mole ratio for every two hydrogen that we start with, we can make to water. So if we start with six hydrogen We can make six water. So our oxygen molecules, the bonds between them were broken during this reaction and each one bonded 22 hydrogen apps. Because the bonds between the hydrogen molecules, we're also broken and we've rearranged to form six water molecules. Alright, so that would be our finished sketch showing the hydrogen. six molecules of the hydrogen Reacting with three molecules of the oxygen to produce six molecules of water. So these are reacting in that proper ratio of 2-1 22.
Explanation:
i hope this helped :)
Show that the following species have the same number of electron Na, Mg, O, and Ne
Answer:
in its neutral state an atom of Na has 11 electrons so when it loses an electron it becomes Na^+ with 10 electrons.
a neutral atom of Mg has 12 electrons by losing 2 elections it becomes Mg^2+ with 10 electrons
a neutral atom of oxygen has 8 electrons if it gains 2 electrons it becomes O^2- with 10 electrons
a neutral atom of Ne has 10 electrons
All of the above species in their excited states has 10 electrons (except for Ne which has 10 electrons in its neutral state) so they are all isoelectronic with Na^+
A student mixes baking soda with acetic acid in a test tube. The student observes the formation of a gas and records the two reactions that occur.
The student concludes that the two reactions follows the Law of Conservation of Matter. Which statement supports the student's conclusion?
The number of atoms in the reactants and products of each reaction is the same. The last option.
Law of conservation of matterThe law of conservation of matter states that during chemical reactions, matter can neither be created nor destroyed but can be converted from one form to another. This law is also applicable to energy and atoms during chemical reactions.
In other words, all chemical reactions, as a rule of thumb, obey the law of conservation. Thus, for any chemical reaction:
Energy is conservedMatter is conservedThe number of atoms of different elements is conservedTherefore, the statement that supports the student's conclusion that the two reactions follows the law of conservation of matter would be that the number of atoms in the reactants and products of each reaction is the same.
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A patient needs 0.024 g of a sulfa drug. There are 8-mg tablets in stock. How many tablets should be given?
Express your answer as an integr
Answer:
Para resolver este ejercicio debemos crear una relación entre la cantidad que necesita el paciente y la cantidad que tienen la pastilla del almacén. Transformamos 0.024 g, tenemos:
0.024 g = 24 mg
Ahora planteamos la relación, tenemos:
R = 24 mg/8mg
R = 3
Por tanto, se le debe dar al paciente 3 pastillas de 8 miligramos.
Nota: Tener en cuenta la homogeneidad de unidades.
indicate the types of forces that are involved between the solute and solvent when forming a homogeneous solution between lino3 and h2o .
The types of forces that are involved between the solute and solvent when forming a homogeneous solution between LiNO₃ and H₂O is ion-dipole forces dispersion forces dipole-dipole forces hydrogen bonding.
The relatively weak attractive forces that is acting on neutral atoms and other molecules as a result of the electric polarization induced in each particle by the presence of other particles. Forces like hydrogen bonding, dispersion forces, and dipole-dipole interactions are all examples of van der Waals forces.
Generally, the kinds of intermolecular forces that are involved in solution formation are dispersion forces, dipole-dipole forces, hydrogen bonding, and ion-dipole forces.
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How many gold atoms are in a 0.330 ounce, 18K gold bracelet? (18K gold is 75% gold by mass.)
The number of gold atoms in 0.330 ounce, 18 K gold bracelet would be 2.12 x [tex]10^{22[/tex] atoms of gold.
Number of atoms in substances1 ounce = 28 grams
0.330 ounce = 0.330 x 28 = 9.24 grams
18 K gold = 75% gold = 9.24 x 0.75 = 6.93 grams
In other words, a 0.330-ounce, 18 K gold bracelet contains 6.93 grams of actual gold.
Mole of 6.93 gold = 6.93/196.967 = 0.0352 mol
1 mole = 6.022 x [tex]10^{23[/tex] atoms
0.0352 mole = 0.0352 x 6.022 x [tex]10^{23[/tex]
= 2.12 x [tex]10^{22[/tex] atoms
In other words, a 0.330-ounce, 18 K gold bracelet contains 2.12 x [tex]10^{22[/tex] atoms of gold.
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Which two atoms are isotopes of each other? A. Si with a mass number of 27 and an atomic number 14, and Mg with a mass number of 25 and an atomic number of 12. B. Mg with a mass number of 24 and an atomic number 12, and Al with a mass number 24 and an atomic number 13. C. Mg with a mass number 24 and an atomic number 12, Mg with a mass number 25 and an atomic number 12. D. Na with a mass number 23 and an atomic number 11, Mg with a mass number 25 and an atomic number 12.
The two atoms are isotopes of each other are Si with a mass number of 27 and an atomic number 14, and Mg with a mass number of 25 and an atomic number of 12. The correct option is A.
What are isotopes?Isotopes are atoms with the same number of protons but differing numbers of neutrons.
They differ in mass, which affects their physical characteristics even if they have nearly identical chemical properties.
An isotope is one of two or more chemical elements that exist in different forms. Varied isotopes of an element share the same atomic number and protons in their nuclei, giving them the same atomic weight.
However, each elemental isotope has a different amount of neutrons, which changes its atomic weight.
They can be referred to as isotopes because Si, which has a mass number of 27 and an atomic number of 14, and Mg, which has a mass number of 25 and an atomic number of 12, both have 13 protons.
Thus, the correct option is A.
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Which term would be directly related to the science of ecology?
digestive system
taxonomy
circulatory system
population growth
Answer:
d. population growth.
Explanation:
A student made a sketch of a potential energy diagram to represent an endothermic reaction.
Explain, using complete sentences, why the diagram made by the student is correct or incorrect. Be sure to also explain what the values of X and Y represent. (10 points)
Answer:
The student's diagram is correct. The potential energy on the x-axis is increasing, and the potential energy on the y-axis is decreasing, which accurately displays an increase in energy (heat) being absorbed by the reaction. The value of X represents the energy of the reactants, while the value of Y represents the energy of the products. This indicates the reaction is endothermic, as the reactants have a lower energy than the products, meaning energy had to be absorbed from the environment in order to reach a stable state.
I need help answering this please IUPAC
Answer:
3,3 dihydroxy
Oh group attach with that benzene ring
What is the name of the bond between two amino acids called? What type of chemical reaction is necessary to make this bond?
The bond between two amino acids is called a peptide bond.
What type of chemical reaction is necessary to make this bond?It is formed through a condensation reaction, which is a type of chemical reaction that involves the formation of a new molecule by the combination of two smaller molecules, with the release of a water molecule.The bond between two amino acids is called a peptide bond. This is a type of covalent bond that is formed between the carboxyl group of one amino acid and the amino group of the other.In order for this bond to form, a dehydration reaction is necessary. This reaction involves the removal of a molecule of water from the two amino acids, leaving a single covalent bond between them.This bond is very stable and is essential for the formation of proteins. Peptide bonds are also involved in the formation of nucleic acids, which are essential for the replication of genetic material.The peptide bond is a very important part of biochemistry and is essential for the function of many biological molecules.To learn more about peptide bond refer to:
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How many atoms are in one mole of the following:
1.0
2.02
3. Na
4. NaCl
Answer:
Explanation:
The number of atoms in one mole of a substance is called Avogadro's number and is approximately 6.022 x 10²³ atoms/mol.
There are 2.02 moles of atoms in one mole of a substance.
The number of atoms in one mole of Na (sodium) is 6.022 x 10²³ atoms/mol
In one mole of NaCl (sodium chloride), there are 6.022 x 10²³ atoms of sodium and 6.022 x 10²³ atoms of chlorine, for a total of 12.044 x 10²³ atoms.
Can you help me with this question
Following are the scientific methods asked in question -
Christina decides to test the idea of her friend Anders that different metals make characteristic colors in flame. She mixes up a variety of metal solutions, then dips steel wires into each and puts each wire into a flame, noting the color of the flame in her record of this experiment.After much experimentation, John discovers a law which says that the wavelengths of light absorbed by hydrogen gas fit into a pattern which he is able to express in a mathematical formula. Niels has a hypothesis about why the wavelength of light absorbed by hydrogen has a certain value. Niels suggests the orbit of the electron in the hydrogen atom can only have certain radii, and when the electron "jumps" from one orbit to another, it emits light of an energy corresponding exactly to the difference in orbit energies.What are Scientific methods?The scientific method, an empirical technique of learning, has governed the development of science from at least the 17th century (with notable practitioners in previous centuries; see the article history of scientific method for additional detail.)
It takes thorough observation and the use of strong skepticism regarding what is observed because one's perception of the observation may be influenced by cognitive presumptions. It entails creating hypotheses using induction based on these observations, testing the accuracy of those hypotheses using experimental and measurement-based statistical testing of the inferences drawn from them, and then adjusting (or discarding) those hypothese in light of the experimental findings.
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How many grams of Pb would be
required to make 119 g H₂O?
Pb+ PbO2 + 2H₂SO4 →
Pb: 207.2 g/mol
H₂O: 18.02 g/mol
Mass Pb (g)
2PbSO4 + 2H₂O
[?] g Pb
As mentioned, 684 g of lead would've been needed to produce 119 g of water.
By mass, what do you mean?The mass of a material or substance tells us how much matter makes up that thing or substance. Despite the possibility of using grams to describe strength training, the kilowatt (kg) is the primary SI mass measurement (g). To measure mass, you might employ a balance. The amount of material an item contains is significantly influenced by its mass. A picture's gravity may be estimated based on its density. Along with its gravity, an element's location is crucial. This means that weight is still used to represent force.
(119 g H₂O) / (18.01532 g H₂O/mol) x (1 mol Pb / 2 mol H₂O) x (207.21 g Pb/mol) = 684 g Pb
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Potassium Phosphide reacts with reacts with aluminum in a single replacement reaction to produce Aluminum Phosphide and Potassium. What coefficient is needed in front of the product potassium to properly balance this chemical equation?
2
3
4
5
Potassium Phosphide reacts with aluminum in a single replacement reaction to produce Aluminum Phosphide and Potassium. The coefficient is needed in front of the product potassium to properly balance this chemical equation is 3. Therefore, option B is correct.
What is potassium ?Potassium is the chemical element which is represented by the symbol K. Its atomic number is 19. Potassium metal reacts rapidly with atmospheric oxygen.
Potassium Phosphide reacts with aluminum in a single replacement reaction to produce Aluminum Phosphide and Potassium. The balance chemical equation is as follows:
2K₃PO₄ + Al₂(SO₄)₃ → 3K₂SO₄ + 2AlPO₄
Thus, option B is correct.
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Topic 2: The Concepts
3. Explain heat of reaction in your own words. Recall the definitions of exothermic
and endothermic. How would you know if a reaction were exothermic or
endothermic? Label each of the reactions you observed as either one.
I
Chemical reactions that release heat energy are called exothermic reactions. example:
What is exothermic and endothermic reaction?C(g)+O2(g)→CO2(g)+thermal energy. A chemical reaction that absorbs heat energy is called an endothermic reaction. example:
CaCO3Heat→CaO+CO2.
A chemical reaction or physical change is endothermic when the system absorbs heat from the environment. In an endothermic process, the system gains heat from the environment and reduces the temperature of the environment.
A chemical reaction that releases energy is called exothermic. In an exothermic reaction, more energy is released in forming bonds within the products than is expended in breaking bonds within the reactants. Chemical reactions that absorb (or consume) energy are called endothermic.
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