Answers
Answer: The reaction of one mole of oxygen [tex](O_2)[/tex] releases 445 kJ of energy.
Explanation:
Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and [tex]\Delta H[/tex] for the reaction comes out to be negative.
Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and [tex]\Delta H[/tex] for the reaction comes out to be positive.
[tex]CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(l)[/tex] [tex]\Delta H=-890kJ[/tex]
on halving the reaction, enthalpy also becomes half
[tex]\frac{1}{2}CH_4(g)+O_2(g)\rightarrow \frac{1}{2}CO_2(g)+H_2O(l)[/tex] [tex]\Delta H=-445kJ[/tex]
Thus The reaction of one mole of oxygen [tex](O_2)[/tex] releases 445 kJ of energy.
Related Questions
how does the sun light affect earths climate
Answers
Answer:
The Sun powers life on Earth; it helps keep the planet warm enough for us to survive. It also influences Earth’s climate: We know subtle changes in Earth’s orbit around the Sun are responsible for the comings and goings of the past ice ages. But the warming we’ve seen over the last few decades is too rapid to be linked to changes in Earth’s orbit, and too large to be caused by solar activity
Explanation:
Scientific Method
PART A: Put the following steps of the scientific method in the correct order,
1 Data
2 Hypothesis
3. Conclusion
4. Problem
5. Variables
6. Research
7. Procedure
Answers
Answer:
Problem, Variables, Hypothesis, Research, Procedure, Data, Conclusion.
Explanation:
First, you have to know what the problem that you're talking about is. Then, you have to know the independent, dependent, and controlled variables are in order to make a hypothesis. Then do research about the topic. After that, you make the procedure your experiment, if that's what your doing. Then after the experiment, you find the data. Using that data, you make a conclusion.
According to plate tectonics, the continents.
do not move at all
are drifting on a sea of magma
will one day be joined together
"float' on top of the crust
Answers
The answer would be B. are drifting on a sea of magma.
The crust is broken up into giant tectonic plates that ride atop the magma, hot melted-rock material that makes up much of the interior of the Earth. Convection in the molten rock of Earth's mantle drives the movement of the plates. Hotter material rises to the surface, while cooler material sinks toward the core.
Hope this helps !
Answer:
are drifting on a sea of magma.
Explanation: Please mark brainliest.
Which of the following are characteristics of heterogeneous mixtures
A. distinguishable components
B. evenly distributed components
C. particles too small to be seen with a microscope
D. components in varying proportions
E. particles that may settle
Answers
Answer:
c
Explanation:
An exothermic reaction releases 13,450J of heat. How many calories of energy are released? A) 5 56,274 calories B)1,244 caloriesC) 134,500 caloriesD) 3,215 calories
Answers
Answer:
The correct option is;
D) 3,215 calories
Explanation:
Here we are required to convert 13,450 J to calories
1 calorie is the amount of heat required to raise the temperature of 1 gram of water by 1°C
Therefore, 1 calorie = 4.184 Joules
Hence, 1 Joule = 1/4.184 calorie for which we have;
13,450 J = 13,450 × 1/4.184 calories = 13,450/4.184 calorie
13,450 J = 3,214.63 calories
Rounding up to the nearest whole number, we have;
13,450 J ≈ 3,215 calories.
Why would the pressure of a sample of gas at a constant volume fall .10 atm?
Answers
Answer:
As the temperature of a sample of gas falls from 45.0ºC to 30.0ºC, its pressure falls to 300.
Explanation:
When an electric circuit operates a buzzard makes a sound what happens to the electric charges in the circuit
Answers
Answer:
Explanation:
Khfxgkfxyfkx
Which of the following best describes the main function of the nervous system?
To deliver nutrients and other essential materials to cells and remove waste products
To break down the nutrients found in food so that they can be used by all cells in the body
To produce the chemical signals that allow parts of the body to communicate over long distances
To coordinate all other body systems so that they can function together to maintain homeostasis
Answers
What kind of energy transformations occur when you hit a coconut with a hammer
Answers
sound energy, kinetic energy,
i cant think of any more but hope this helps
Answer:
Mechanical to kinetic to sound to heat
Explanation:
Remember that all types of energy transformation end in heat
3. Trees, bananas, skateboards and pancakes are all solids. They have
atoms that are closely packed together and don't move around very
much. Solids also have definite shape, mass and volume. "Definite"
means that it doesn't easily change. When you pour cereal into a bowl,
the pieces of cereal don't change shape. But when you pour milk into a
bowl, the milk takes the shape of the bowl. That's because cereal is a
solid.
A
Which of the following is an example of a solid?
A. applesauce
Corange juice
B. watermelon
D. berry smoothie
Answers
Answer:
B. Watermelon
Explanation:
Watermelon is the only option with a definite shape that wouldn't change if you put it in a bowl
What name is given to any chemical which increase the rate of a chemical reaction
Answers
Answer:
It is called catalyst.
Answer:
A catalyst
Explanation:
is a substance that can alter the rate of a chemical reaction. Catalysts can be successfully used to increase the rate of a chemical reaction.
Over the past century, the percent of squirrels in the vicinity of Washington, DC, that are black instead of the more common gray has been continually increasing. Which of the following statements best explains why this is happening?
A.
Black squirrels are more visible against tree trunks than gray squirrels.
B.
Black squirrels are more popular with tourists than gray squirrels.
C.
Gray squirrels are more comfortable with humans than black squirrels.
D.
Black squirrels have a survival advantage over gray squirrels.
Answers
How many atoms are there in 2 moles of helium?
Answers
Answer:
1 mole Of Helium = Weight of Helium/4Weight of Helium = 1*4 = 4 grams 1 mole of Helium contains 6.023*10²³ ( Avogadro number) atoms. Number of moles of in 4 grams of Hydrogen 4 grams is = given weight / molecular weight of Hydrogen (H₂) = 4/2 =2 Number of atoms/molecules in 2 moles of Hydrogen is (2*6.023*10²³) atoms. = 12.046*10²³ atoms.
(Hope this helps)
The number of atoms in 2 moles of helium is 1.204×10²⁴ atoms
From Avogadro's hypothesis,
1 mole of any substance = 6.02×10²³ atoms
Thus,
1 mole of helium = 6.02×10²³ atoms
With the above information in mind, we can obtain the number of atoms in 2 moles of helium as follow:
1 mole of helium = 6.02×10²³ atoms
Therefore,
2 moles of helium = 2 × 6.02×10²³ atoms
2 moles of helium = 1.204×10²⁴ atoms
Thus, we can conclude that 2 moles of helium contains 1.204×10²⁴ atoms
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Calculate the molarity of a KCl solution if 37.3 g of KCl are dissolved in water to give a
final solution volume of 500 ml.
Answers
The molarity of a KCl solution if 37.3 g of KCl are dissolved in water to give a final solution volume of 500 ml is 1 M.
What is Molarity?Molarity of a given solution is known as the total number of moles of solute per litre of the solution. A solution that is 1.00 molar (written 1.00 M) contains 1.00 mole of solute for every liter of solution.
Molarity = (No. of moles of solute ÷ Volume of solution in liters)
The unit of molarity is mol L⁻¹.
Molarity is temperature dependent because as temperature changes, volume of the solution also changes.
Given, Mass of KCl = 37.3 g
Molar mass of KCl = 74.5 g/mol
Volume of solution = 500ml = 0.5 L
No. of moles = Mass / Molar mass = 0.5
Molarity = 0.5/0.5 = 1 M
Therefore, The molarity of a KCl solution if 37.3 g of KCl are dissolved in water to give a final solution volume of 500 ml is 1 M.
Learn more about Molarity, here:
https://brainly.com/question/8732513
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Which two substances are reactants in the chemical reactions of cellular
respiration?
I A. Carbon dioxide
B. Water
C. Sugar
D. Oxygen
Answers
Answer:
Explanation:
A. Carbon dioxide
D. Oxygen
Answer:
Oxygen and sugar
Explanation:
what is the same between mass and weight
Answers
Answer:
Mass is how much matter an object has. Weight is how much gravity an object is being acted upon.
Explanation:
The mass of an object will stay the same no matter where you place it. But if you were to place the object, in the moon for example, then the weight of the object would be less since there is less gravity on the moon.
The new-moon phase occurs when the Moon is positioned between the Earth and the Sun. However, these positions do not always cause an eclipse of the Sun because the *
a. Moon's orbit is tilted relative to the Earth's orbit
b. New-moon phase is visible only at night
c. Night side of the Moon faces toward the Earth
d. Apparent diameter of the Moon is greatest during the new-moon phase
Answers
Answer:
D
Explanation:
The new-moon phase occurs when the Moon is positioned between the Earth and the Sun. However, these positions do not always cause an eclipse blocking of the Sun because the Moon's orbit is tilted relative to the Earth's orbit new-moon phase is visible only at night side of the Moon faces toward the Earth apparent
These positions do not always cause an eclipse of the Sun as:
d. Apparent diameter of the Moon is greatest during the new-moon phase
New-moon phase:At the new Moon phase, the Moon is so close to the Sun in the sky that none of the side facing Earth is illuminated. The new-moon phase occurs when the Moon is positioned between the Earth and the Sun. However, these positions do not always cause an eclipse blocking of the Sun because the Moon's orbit is tilted relative to the Earth's orbit. New-moon phase is visible only at night side of the Moon faces toward the Earth apparent.
Thus, correct option is d.
Find more information about New-moon phase here: https://brainly.com/question/12676209
If a gas occupies 22.4 L at 0.265 atm, then what will the pressure be in atmospheres if the gas occupies 35.52 L? Assume all other
variables are held constant
A)0.167 atm
B)0.437 atm
C)0.886 atm
D)149 atm
Answers
Answer:
The new pressure is 0.167 atm
The correct answer is option A
Explanation:
Step 1: Data given
Volume of the gas = 22.4 L
Pressure of the gas = 0.265 atm
The volume increases to 35.52 L
Step 2: Calculate the new pressure
P1*V1 = P2*V2
⇒with P1 = the initial pressure = 0.265 atm
⇒with V1 = the initial volume = 22.4 L
⇒with P2 = the new pressure = TO BE DETERMINED
⇒with V2 = the increased volume = 35.52 L
0.265 atm * 22.4 L = P2 * 35.52 L
P2 = (0.265 atm * 22.4 L) / 35.52 L
P2 = 0.167 atm
The new pressure is 0.167 atm
The correct answer is option A
What is the difference between a haploid species and a diploid species?
Answers
Answer:
Diploid refers to the number of whole chromosome sets present in every cell of an organism: diploid cells contain entire sets. Haploid organisms, only include one complete chromosome set.
Answer:
Haploid species have only one set of complete chromosomes. Diploid species have two sets of complete chromosomes. Haploid cells are created by meiosis, where the diploid cell will divide in half. Two haploids merge by fertilization. Diploid cells reproduce by mitosis making daughter cells that are exact replicas.
Explanation:
examples of haploid are cells (gamate) sperm and ovate
examples of diploid are skin cells, blood cells
I need help on this question
Answers
The oxidation number of bromine in bromine gas is _____. A. 0 B. +1 C. –1 D. –2
Answers
Answer:
the answer is 0
The answer to the question is
A. 0
A chemist needs 2.00 liters of hydrochloric acid. How many pints is this?
Answers
Answer:
4.22675
Explanation:
There are several ways to model a compound. One type of model is shown.
What is the chemical formula for the molecule modeled?
a.CHO
b.C4H11O2
c.C6H12O2
d.C6H9O
Answers
Answer:
C. C₆H₁₂O₂
Explanation:
Answer: C
Explanation:
C₆H₁₂O₂
IS THE ANSWER I GOT 100% on the Test!!
Help on science question please! (Small drawing) will mark brainliest
Answers
1-Which reaction shown below is carried out by nitrifying bacteria? I will mark you as brainlist
Choose:
A.{ammonium} to {nitrate}
B.{nitrate} to {nitrogen gas}
C.{nitrogen gas} to{ammonium}
Answers
Answer:
ammonium to nitrate.
Explanation:
they tie em together
What is the volume of solution (in mL) produced when 91.80g of Mg(OH)2 are used
to produce a 0.7M solution? Record your answer to 1 decimal places.
Answers
Answer: The volume of solution is 2248 ml
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]
where,
n = moles of solute
[tex]V_s[/tex] = volume of solution in ml
moles of [tex]Mg(OH)_2[/tex] = [tex]\frac{\text {given mass}}{\text {Molar mass}}=\frac{91.80g}{58.32g/mol}=1.574mol[/tex]
Now put all the given values in the formula of molality, we get
[tex]0.7=\frac{1.574\times 1000}{V_s}[/tex]
[tex]V_s=\frac{1.574\times 1000}{0.7}=2248ml[/tex]
Therefore, the volume of solution is 2248 ml
How many total atoms from Carbon are present on the reactant side?
20 points
2CH2+202
O2+HC4
5
2
1
3
Answers
Answer:
2 carbon atoms/molecules are present on the reactant side.
hope it helps!
I AM GIVING BRAINLIEST PLEASEEEEEEE HELPPPPPPP I NEEDDDDD HELPP PLZ
If 0.020 mol of LiOH are dissolved to make 4.5L of solution, what is the molarity?
PLEASE WRITE WITH STEPS
Answers
Answer:
0.0044 M or mol/L
Explanation:
We have to know that molarity is moles of a certain thing/litres of solution.
So the info we are given is we have 0.020 mol of LiOH and the litres of solution is 4.5L, hence we just plug it into the
Molarity forumla= moles of a certain thing/litres of solution.
Molarity (M)= 0.020/4.5 = 0.0044 M or mol/L
in water, what happens to a base?
It forms hydrogen ions (H+)
It condenses
It evaporates
It forms hydroxide ions (OH-)
Answers
Answer:
A base forms hydroxide ions in water.
Hope this helps
Given the formula for a compound:
What is a chemical name for the compound?
1.
1-butanamine
2.
1-butanol
3.
butanamide
4.
butanoic acid
Submit Answer
Answers
Answer:
3.
Explanation:
4 carbon equals butane
O=C-NH2 equals amide
The chemical name for the compound with the chemical formula shown in the image is 1-butanamide.
Chemical nameIn order to name the compound:
Count the number of straight-chain carbon = 4 Identify the functional group = amideFour (4) carbon is named as "But-" and the functional group is an amide on the first carbon.
Thus, the chemical name would be 1-Butanamide.
More on organic naming can be found here: https://brainly.com/question/10291752
