The new substance will need more energy to form its chemical bonds than the old substance will release. Hence, option A is correct.
What is an endothermic reaction?Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.
Endothermic reactions, in general, are those that absorb (or use) energy. In endothermic reactions, more energy is absorbed when bonds in the reactants are broken than is released when new bonds are formed in the products.
Normally, when a chemical bond is broken, energy is released in the process. The chemical bond formation also demands an energy input.
The energy that is supplied/released can come in varieties (such as heat, light, and electricity). The formation of chemical bonds following the absorption of heat from the environment characterizes endothermic processes.
When two chemicals react in an endothermic reaction the new substance will need more energy to form its chemical bonds than the old substance will release. Hence, option A is correct.
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Which change to a DNA molecule would have the least effect on an organism? an addition to a base sequence at the beginning of a gene a deletion from a base sequence in the middle of a gene a substitution in a base sequence that does not code for a protein a substitution that creates a “stop” code in the middle of a gene
Answer:
Change in a single nitrogen base in the DNA sequence will not have any significant effect on the organism.So A: an addition to a base sequence at the beginning of a gene
Explanation:
This is known as point mutation and it does not have any significant change in the protein and it is least harmful type of DNA mutation.
Which structure is the Lewis structure for ammonia (NH3)?
Answer:
C
Explanation:
Because NH3 has 8 valence electrons, and Hydrogen can only have 1 bond
An example of polytamic anoin would be a. Ca+2 b. NH4+ c. F d. PO4-3
[tex]PO_4^{-3}[/tex] and [tex]NH^{4+}[/tex] are polyatomic anions composed of two or more atoms.
What is a polyatomic anion?A polyatomic ion is an ion composed of two or more atoms. Examples: The hydroxide cation ([tex]OH^-[/tex]) and the phosphate cation ([tex]PO_4^{3-}[/tex]) are both polyatomic ions.
[tex]PO_4^{-3}[/tex] and [tex]NH^{4+}[/tex] are the polyatomic anions because both contain more than 1 atom.
Hence,[tex]PO_4{-3}[/tex] and [tex]NH^{4+}[/tex] are polyatomic anions composed of two or more atoms.
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4.
A dead alkaline battery is found to contain a compound of manganese and oxygen. Its percentage composition
is 70.0% Mn and 30.0% O. What is the empirical formula of this substance?
The dead battery with a percentage composition of 70.0% Mn and 30.0% O has the empirical formula Mn₂O₃.
What is an empirical formula?An empirical formula is the minimal relationship between the atoms in a chemical formula.
A dead alkaline battery is 70.0 % Mn and 30.0 % O. To find the empirical formula, we will divide each percentage by the molar mass of the element.
Mn: 70.0/54.94 = 1.27O: 30.0/16.00 = 1.88Then, we divide both numbers by the smallest one.
Mn: 1.27/1.27 = 1O: 1.88/1.27 ≈ 1.5Finally, we multiply both numbers by 2 so that they are whole numbers.
Mn: 1 × 2 = 2O: 1.5 × 2 = 3The empirical formula of the compound is Mn₂O₃.
The dead battery with a percentage composition of 70.0% Mn and 30.0% O has the empirical formula Mn₂O₃.
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A solution of ammonia has a pH of 11.8. What is the concentration of OH– ions in the solution
[tex]~~~~~\text{pH} + \text{pOH} = 14\\\\\implies \text{pOH} = 14- \text{pH}\\\\\implies \text{pOH} = 14 - 11.8\\\\\implies \text{pOH} = 2.2\\\\\text{Now,}\\\\~~~~~~~\text{pOH}= -\log\left[\text{OH}^{-1}\right]\\\\\implies \left[\text{OH}^{-1} \right] = 10^{-\text{pOH}} = 10^{-2.2}~ = 0.006309~M\\\\\text{Hence the concentration of OG}^{-1}~ \text{is 0.006309~M}[/tex]
Question 2 of 35
Which two phrases describe ice storms?
A
A. Temperatures way below freezing
B. A large amount of snow falling
C. Temperatures near freezing
D. A large amount of ice forming
Please help!
An ice storm is a temperature below freezing resulting from large amount of snow falling, i.e., options A and B.
What is ice storm?Freezing rain causes ice storms. Raindrops travel into a tiny layer of below-freezing air near the earth's surface, where they freeze on contact with the ground, trees, automobiles, and other things.
Ice forms when cold rain freezes in contact with surfaces below the freezing point.
Thus, the correct options A and B.
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please help!
What happens when a hot metal rod with a temperature of 100 degrees is placed in 10 degree cold water ?
1) the temperatures of the rod & water will both decrease
2) heat will travel out of the metal rod & into the water
3) the temperatures of the rod & water will both decrease
4) the temperatures of the rod & water will both increase
Answer:
What happens when a piece of hot metal is dropped in room temperature water. Over time the metal will cool and the water will heat up. Eventually the two objects will have the same temperature. They are then said to be in thermal equilibrium with one another.
Explanation:
i hope this helps you!!
Part A
Look at the graphical display for the group 1 elements. What pattern do you observe about atomic radii as you move from
ydrogen at the top of the table to francium at the bottom?
The atomic radii of the atoms in the group 1 increases down the group as we go from Hydrogen to Francium.
What is atomic radii ?The total distance from the nucleus of an atom to the outermost orbital of its electron is known as its atomic radii or atomic radius.
As we go down the group, the number of orbits or shell increases.
Hence, atomic radii of the atoms in the group 1 increases down the group as we go from Hydrogen to Francium.
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How many grams of SO2 would you need to dissolve in 100g of 40 degree water to make a saturated solution?
If you heated the solution to 90 degrees would the new solution be unsaturated, or supersaturated?
The grams of SO₂ that would be dissolved in 100 g of 40 degree water to make a saturated solution can be calculated by making solubility curve.
What is mass?Mass is the quantity of matter of a physical body.
If you want to calculate the mass of Sulfur dioxide in 100 g of 40 degree, you have to make a solution curve.
With the increase in temperature, the solubility increases as well
Thus, the grams of SO₂ that would be dissolved in 100 g of 40 degree water to make a saturated solution can be calculated by making a solubility curve.
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Cyclohexenone is a useful starting material for drug synthesis. For each reaction, predict the major addition product for the reaction between an α,β‑unsaturated ketone and carbon nucleophile
Cyclohexenone is a useful starting material for drug synthesis. For each reaction. The major additional product for the reactions are respectively given as;
A soft electrophile A hard electrophileThis is further explained below.
What is an electrophile?Generally, An electrophile is simply defined as a species of a chemical compound that may receive an electron pair from a carbonyl group in order to establish chemical bonds.
In conclusion, It is common practice to add 1,4 significance to the alkene of asymmetric nucleophiles when using organocuprate reagents in the process at the top.
Grignard reagents often add 1,2 to the carbonyl of asymmetric carbonyl compounds in the bottom reaction
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Cyclohexenone is a useful starting material for drug synthesis. For each reaction. The major additional product for the reactions are respectively given as;
A soft electrophile
A hard electrophile
What is an electrophile?Generally, An electrophile is simply defined as a species of a chemical compound that may receive an electron pair from a carbonyl group in order to establish chemical bonds.
In conclusion, It is common practice to add 1,4 significance to the alkene of asymmetric nucleophiles when using organocuprate reagents in the process at the top.
Grignard reagents often add 1,2 to the carbonyl of asymmetric carbonyl compounds in the bottom reaction
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You wish to make a 0.285 M hydroiodic acid solution from a stock solution of 12.0 M hydroiodic acid. How much concentrated acid must you add to obtain a total volume of 50.0 mL of the dilute solution
The amount, in mL, of the concentrated acid required, would be 1.1875 mL
DilutionFrom the dilution equation:
m1v1=m2v2 where m1 and m2 = molarity before and after dilution, and v1 and v2 = volume before and after dilution.
m2 = 0.285M, m1 = 12.0M v2 = 50.0 mL
v1 = m2v2/m1 = 0.285x50/12 = 1.1875 mL
Thus, 1.1875 mL of the acid would be taken and diluted with water up to the 50 mL mark.
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Circulacion de electrones en un material conductor en determinado tiempo.
Answer:
falso
Explanation:
tiempo no determinado El circulation de elctrones
3. Humans discovered how to use fire and tools. How was this knowledge passed along to younger generations?
Communication skills were developed so knowledge could be passed along to younger generations.
Primitive knowledge was instinctive so that the basic skills of fire and tools came naturally to everyone.
Younger people were forced to spend long hours building fires and making tools.
O The younger generations were able to figure out how to use tools on their own.
Communication skills were developed so knowledge could be passed along to younger generations.
How knowledge will pass through generations?Knowledge will pass from one generation to another with the help of education. The skill people give education to their youngers about fire and tools. In this way, skills of fire and tools pass from one generation to another.
So we can conclude that communication skills were developed so knowledge could be passed along to younger generations.
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Answer:
A
Explanation:
Find the number of protons, neutrons, and electrons in 6429Cu.
Answer:
bottom :)
Explanation:
Question: How Many Protons, Neutrons, And Electrons Are In A Neutral Atom Of Copper, Cu, With An Atomic Number Of 29 And Mass Number Of 64? A. Protons = 64, Neutrons = 29, Electrons = 29 B. Protons = 35, Neutrons = 29, Electrons = 35 C.
Which describe beta decay? check all that apply. in beta decay, a proton becomes a neutron and a positron. in beta decay, a neutron becomes a proton and an electron. in beta decay, a neutron becomes a proton and a gamma ray. beta decay releases energy. beta decay releases a helium-4 nucleus.
The statements which best describe beta decay are: option 1, 2 and 4.
What is a beta particle?A beta particle can be defined as an isotope which typically undergoes radioactive decay through the emission of a radiation with a -1 charge.
Based on scientific information and records from radioactivity, we can infer that the statements which best describe beta decay are:
During beta decay, an atom of proton becomes a neutron and a positron. During beta decay, an atom of neutron becomes a proton and an electron.Beta decay releases energy.Read more on beta decay here: https://brainly.com/question/12448836
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Answer:
1,2,4
Explanation:
which of the following is not balanced equation
Answer: (2)
Explanation:
There are 16 oxygen atoms on the reactant side but only 10 on the products side.
One atomic mass unit ( 1 amu)
is equal to the mass of a carbon-12 atom multiplied by the quantity
Answer: 1/12
Explanation:
A carbon-12 atom has a mass of 12 amu, so multiplying this by 1/12, we get 1 amu.
PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
ITS B
Explanation:
MY CONSCIOUS MIND IS TELLING ME
HELP NEED DONE ASAPP BEFORE 11:59PM!!!!
Predict the total pressure in Container C if the initial pressure in Container A was tripled and. Container B was reduced by one-third then mixed in Container C.
Container A Oxygen 287 kPa
Container B Nitrogen 429 kPa
Container C Oxygen + Nitrogen
Pressure
=
P total
Answer:
I think B sorry if wrong
Explanation:
have a good day
How many moles of Calcium Oxide are needed to produce 4 moles of Calcium Hydroxide?
Taking into account the reaction stoichiometry, 2 moles of CaO are required to react with 2 moles of Ca(OH)₂.
Reaction stoichiometryIn first place, the balanced reaction is:
CaO + H₂O → Ca(OH)₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
CaO: 1 mole H₂O: 1 moleCa(OH)₂: 1 moleMoles of CaO requiredThe following rule of three can be applied: If by stoichiometric reaction 1 mole of Ca(OH)₂ is produced by 1 mole of CaO, 2 moles of Ca(OH)₂ are produced by how many moles of CaO?
[tex]moles of CaO=\frac{2 moles of Ca(OH)_{2}x1 mol of CaO }{1 mole of Ca(OH)_{2}}[/tex]
moles of CaO= 2 moles
Finally, 2 moles of CaO are required to react with 2 moles of Ca(OH)₂.
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The pressure of x ml of a gas was increased from 2 atm to 4 atm at constant temperture. what will be the new volume?
The new volume of the gas given the data from the question is 1/2X mL
Data obtained from the question
Initial volume (V₁) = X mL
Initial pressure (P₁) = 2 atm
New pressure (P₂) = 4 atm
New Volume (V₂) = ?
How to determine the new volume
The new volume of the gas can be obtained by using the Boyles’ law equation as illustrated below:
P₁V₁ = P₂V₂
2 × X = 4 × V₂
2X = 4V₂
Divide both side by 4
V₂= 2X / 4
V₂ = 1/2X mL
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Calculate the molarity of an HCl solution if 23.88 mL of it reacts with 6.5287 grams of sodium carbonate (106 g/mol) according to
2HCl + Na2CO3 → 2NaCl + H2O + CO2 Answer in units of mol/L.
I NEED HELP
Answer:
5.158 mol/L
Explanation:
To find the molarity, you need to use the formula:
Molarity (M) = moles / volume (L)
You have been grams sodium carbonate. You need to (1) convert grams Na₂CO₃ to moles (via molar mass), then (2) convert moles Na₂CO₃ to moles HCl (via mole-to-mole ratio from equation), then (3) convert mL to L (by dividing by 1,000), and then (4) use the molarity equation.
Steps 1 - 2:
2 HCl + 1 Na₂CO₃ ----> 2 NaCl + H₂O + CO₂
6.5287 g Na₂CO₃ 1 mole 2 moles HCl
-------------------------- x ------------- x ------------------------- = 0.12318 mole HCl
106 g 1 mole Na₂CO₃
Step 3:
23.88 mL / 1,000 = 0.02388 L
Step 4:
Molarity = moles / volume
Molarity = 0.12318 mole / 0.02388 L
Molarity = 5.158 mole/L
**mole/L is equal to M**
A solid chloride E which sublimes on heating reacted with an alkali F to give a choking gas G.G turns red litmus paper blue . identify E, F and G
Answer:
E:ammonium chloride
F:sodium hydroxide
G:ammonia
Which fundamental force allows you to use a compass?
O A. Strong nuclear
OB. Gravitational
C. Weak nuclear
OD. Electromagnetic
can you guys please help me on these 2 questions im stuck
Answer:
O2 is limiting reactant
Explanation:
4 x Al = 107.924 gm
6 x O = 95.994 gm
you need ALMOST as many grams of O2 as Aluminum....
you are short of O2 <======the limiting reactant
Each substance to the right of the arrow in a chemical equation is a.
Assume that your electrical power company gets its energy from a hydroelectric dam. Outline all of the energy changes that occurred from the falling water that turned the generators at the dam to the hot air that was produced from your hair dryer this morning.
Kinetic energy in different forms occurred from the falling water that turned the generators at the dam to the hot air that was produced from your hair dryer this morning.
What is Kinetic energy ?Kinetic energy is a form of energy that an object or a particle has by reason of its motion. If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy.
Kinetic energy (water) to electric energy (dam) as the hydroelectric dam works.
Then, as the current travels from the plant to your crib, electric energy to heat energy (wire resistance).
Then, when you are using the dryer electric energy to heat energy (hot air) and sound energy (air particles vibrate due to the heat energy).
Therefore, Kinetic energy in different forms occurred from the falling water that turned the generators at the dam to the hot air that was produced from your hair dryer this morning.
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23 Which device requires electrical energy to
produce a chemical change?
(3) voltaic cell
(1) electrolytic cell
(2) salt bridge
(4) voltmeter
Answer:
electrolytic cell
Explanation:
Electrolytic cell used electrical energy to do electrolysis.
Then by using oxidation and reduction ions produced it does produce chemical changes
Option A
Check Your Learning
What mass of CO is required to react with 25.13 g of Fe2O3
according to the equation Fe₂O3 + 3 CO2 Fe + 3CO₂?
Answer:
convert the 25.13 g of Fe2O3 into moles by dividing by its molar mass (159.69) to get that. When looking at the stoichiometric coefficients, we can see that for every 1 mole of Fe2O3, there needs to be 3 moles of CO.
Explanation:
Which reaction takes place in a nuclear fission reactor?
OCH N
→
239
O Pu+ He 242 Cm
94
96
O 27 Co+He→Co+n
139
O 235 U+n Kr+¹Ba+3/n
56
92
The reaction that takes place in a nuclear fission reactor is as follows: 235/92 U + 1/0n 94/36Kr + 139/56 Ba + 3/0n.
What is a nuclear fission reactor?A nuclear fission reactor is the place where nuclear chain reactions occur that produce energy by fission.
Nuclear fission is the nuclear reaction in which a large nucleus splits into smaller ones with the simultaneous release of energy.
Therefore, the option that involves the splitting of atoms into smaller ones is as follows: 235/92 U + 1/0n 94/36Kr + 139/56 Ba + 3/0n.
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