Answer:
2. Energy
Explanation:
The equation for the combustion of CH4 (the main component of natural gas) is
CH4(g)+2O2(g)→CO2(g)+2H2O(g) ΔH∘rxn=−802.3kJ
How much heat is produced by the complete combustion of 271 g of CH4? in kJ
Heat produced = -13588.956 kJ
Further explanationGiven
The reaction of combustion of Methane
CH4(g)+2O2(g)→CO2(g)+2H2O(g) ΔH∘rxn=−802.3kJ
271 g of CH4
Required
Heat produced
Solution
mol of 271 g CH₄ (MW=16 g/mol0
mol = mass : MW
mol = 271 : 16
mol = 16.9375
So Heat produced :
= mol x ΔH°rxn
= 16.9375 mol x −802.3kJ/mol = -13588.956 kJ
Why are atoms electrically neutral if they contain charged particles?
Answer:
Atoms are electrically neutral because they have equal numbers of protons (positively charged) and electrons (negatively charged).
Explanation:
answer this I hope you can see it
Answer:
Explanation:
Dry I can't c it
Between room temperature and its melting point (1132C), pure U metal exists in three crystal phases: alpha, beta, and gamma. Transformation from alpha to beta occurs at 668C and from beta to gamma at 775C. Calculate theoretical density (g/cm3) for all three phases.
1
12.Which equation represents condensation?
a) 12(s) → 12(g)
b) 120 - 12(g)
c) 12(g) → 12)
d) 12(s) - 12(g)
Answer:
Gas to Solid
Explanation:
A condensation reaction goes from gas to solid
Condensation is a physical change which alters the physical properties of matter particularly the form and state. In a condensation reaction, a gas goes from solid to liquid.
It is the inverse of the sublimation reaction.
It involves the loss in energy by a gas. When gases lose energy, they become pulled together by attractive forces. This changes their state to solid with enough loss in energy.Perform the following
mathematical operation, and
report the answer to the
appropriate number of
significant figures.
11.65498 + 156.325 = [?]
Answer:
167.980.
Explanation:
Hello!
In this case, since additions involving the display of the result with the appropriate number of significant figures involve the solution of the system without looking at them:
[tex]156.325 +11.65498 =167.97998[/tex]
Considering that 156.325 is significant to the thousandths and 11.65498 to the hundred thousandths, we infer that the result should be taken to the thousandths as well as 156.325; thus, we obtain:
[tex]167.980[/tex]
Because the second decimal nine is rounded to ten and therefore the 7 is taken to 8.
Best regards!
has DNA that tells the rest of the organelles what to do
Answer:
No
Explanation:
i honestly don't know
Question 1 of 10
Where is a tomado most likely to form?
O A. Where warm, moist air masses traveling north collide with cool,
dry air masses traveling south
O B. On the northwestern side of a low-pressure system
C. Where a high-pressure system is lingering over an area
OD Over warm, tropical ocean water
SUBMIT
Answer:
A Where warm, moist air masses traveling north collide with cool,
dry air masses traveling south
Please help me ASAP I’ll mark Brainly
Answer:
Batteries hold chemical energy
Explanation:
The battery acid in a battery leads to chemical energy.
What part of the leaf is responsible for absorbing the sun’s energy?
Answer:chlorophyll
Explanation:
The part of leaves that is responsible for absorbing sun's energy is chloroplast.
What is chloroplast?A chloroplast is an organelle found within the cells of plants and certain algae that is responsible for photosynthesis, which is the process by which solar energy is converted into chemical energy for growth.
Small organelles called chloroplasts are found inside plant cells and store sunlight energy.
The chloroplast's thylakoid membranes contain a light-absorbing pigment called chlorophyll, which is responsible for the plant's green color.
They are in charge of photosynthesis, which is the process of converting light energy into sugar and other organic molecules that plants and algae use as food.
They also produce amino acids and lipids, which are required for the production of chloroplast membranes.
Thus, the chloroplast is the part that traps the energy of the Sun.
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N
0/2 points
Imagine: There are at least a few atoms that now make up you, that USED to make up one of the
dinosaurs that lived 65 million years ago! Explain how this could be using the idea that elements were
originally created in the heat and explosion of stars.
Answer:
These people painted mostly animals that they most likely hunted as a major source of food, and in doing so left behind evidence of their activities i think
Explanation:
Please show all work for full credit.
1. (6 pts) A photon has a wavelength of 325 nm. Does the photon have sufficient energy to
break a N=N bond that has a bond energy of 418 kJ/mol.
Answer:
No, it is not sufficient
Please find the workings below
Explanation:
Using E = hf
Where;
E = energy of a photon (J)
h = Planck's constant (6.626 × 10^-34 J/s)
f = frequency
However, λ = v/f
f = v/λ
Where; λ = wavelength of light = 325nm = 325 × 10^-9m
v = speed of light (3 × 10^8 m/s)
Hence, E = hv/λ
E = 6.626 × 10^-34 × 3 × 10^8 ÷ 325 × 10^-9
E = 19.878 × 10^-26 ÷ 325 × 10^-9
E = 19.878/325 × 10^ (-26+9)
E = 0.061 × 10^-17
E = 6.1 × 10^-19J
Next, we work out the energy required to dissociate 1 mole of N=N. Since the bond energy is 418 kJ/mol.
E = 418 × 10³ ÷ 6.022 × 10^23
E = 69.412 × 10^(3-23)
E = 69.412 × 10^-20
E = 6.9412 × 10^-19J
6.9412 × 10^-19J is required to break one mole of N=N bond.
Based on the workings above, the photon, which has an energy of 6.1 × 10^-19J is not sufficient to break a N=N bond that has an energy of 6.9412 × 10^-19J
plz help plzzzzzzzzzzzzzzz
Answer: C.
Explanation: Please mark Brainlest Pleasee
could someone please help me out??
Which of the following is not true about proteins?
A.) Proteins are found in hemoglobin and in the keration of skin.
B.) Proteins are made up of long chain amino acids
C.) Polypeptides are formed by 10 or mode amino acids
D.) Common amino acids are adenine and guanine
Answer:
(I'm not sure tbh) It's C Polypeptides are formed by 10 or more amino acids
Which list is in order from smallest to biggest?
O A. Earth
Galaxy – Solar system
Solar system - Nebula
O B. Solar system
Nebula
Galaxy → Universe
O C. Nebula
Galaxy – Solar system - Universe
O D. Universe
Nebula - Galaxy
Earth
Answer:
B
Explanation:
Got it right on a quiz
The list that is in order from smallest to biggest is Nebula-Galaxy -Solar system - Universe. The correct answer is option C.
A nebula is a cloud of gas and dust in space, which is the smallest object in the list.
A galaxy is a collection of stars, gas, and dust held together by gravity, which is larger than a nebula.
A solar system is a collection of planets and other objects that orbit a star, which is larger than a galaxy.
The universe is the largest entity in the list, comprising all matter and energy in existence.
Therefore, option C. Nebula-Galaxy -Solar system - Universe is the correct order of the list from smallest to biggest.
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How many grams of sodium carbonate, Na2CO3, are needed to add to 0.125 kg of water to make a 0.200 m (molal) solution
Answer:
Mass = 2.65 g
Explanation:
Given data:
Mass of sodium carbonate = ?
Mass of water = 0.125 g
Molality = 0.200 m
Solution:
Formula:
Molality = number of moles of solute / mass of solvent in Kg
by putting values,
0.200 m = Number of moles of solute / 0.125 kg
Number of moles = 0.200 m × 0.125 kg
Number of moles = 0.025 mol
Mass of sodium carbonate:
Mass = number of moles × molar mass
Mass = 0.025 mol × 106 g/mol
Mass = 2.65 g
how many atoms are there in 0.075 mol of titanium
Answer:
There are 6.022x10^23
Explanation:
plzz put me as brainest
A change from one state (solid or liquid or gas) to another without a change in chemical composition is called what.
Answer:
Physical Change. A change of matter from one form to another without a change in chemical properties. Chemical Change. A change that occurs when one or more substances change into entirely new substances with different properties.
Explanation:
What three factors contribute to total thermal energy of a substance?
Answer:
Mass, temperature, and phase.
Select the correct answer.
Which characteristic is a property of water?
Answer: A. It is made of polar molecules.
Explanation:
A polar molecule refers to a molecule that has a covalent bond but has an uneven distribution of electrons due to an atom in the molecule having strong electronegativity which will attract more of the electrons from the other atom.
Water is such a molecule because Oxygen has strong electronegativity which leads to electrons being pulled to it.
Answer:
e
Explanation:
A chemist adds 170.0mL of a ×3.75 x 10^−6/μmolL mercury(I) chloride Hg2Cl2 solution to a reaction flask. Calculate the mass in micrograms of mercury(I) chloride the chemist has added to the flask.
Answer:
3 * 10^-4 μg
Explanation:
Molar mass of Hg2Cl2 = 472.09 g/mol
Now;
number of moles = mass/molar mass = concentration * volume
So;
n =m/M = CV
m = MCV
C = 3.75 x 10^−6/μmolL or 3.75 x 10^−12 molL-1
M =472.09 g/mol
V= 170.0mL
m = 3.75 x 10^−12 * 472.09 * 170.0/1000
m = 3 * 10^-10 g or 3 * 10^-4 μg
Match the properties to the family of elements they describe.
Family’s are Alkali Metals and Halogens.
List of properties
• are placed in group 12
•are placed in group 1
•are placed in group 17
• can be cut with a knife
• react vigorously with metals
• don’t react with any other elements
Plz help
Answer:
Alkali Metals: •are placed in group 1, • can be cut with a knife
Halogens: •are placed in group 17, • react vigorously with metals
Explanation:
Alkali metals are the metals found in group 1 of the periodic table. They have one outermost shell electron. They react with cold water vigorously to form alkalis and liberate hydrogen gas as well. They are very reactive metals and their reactivity increases on going down the group. They are soft and can be cut with a knife. Examples of alkali metals are lithium, sodium,potassium, rubidium,caesium, francium.
The Halogens are reactive non-metals placed in group 17 of the periodic table. They have seven outermost shell electrons. They are the most reactive non-metals react vigorously with metals by to form ionic compounds. They exist as diatomic molecules. They are found in nature mainly as salts because of their reactivity. Their reactivity decreases on going down the group. Examples of the halogens include fluorine, chlorine, bromine, iodine and astatine.
Help Will give brainlyest
Answer: deposition
extra words lol
Which of the following represents a ternary ionic compound that is also multivalent?
A.Mn(CIO3)2
B. Mno
C. NH3
D. HCIO3
In the 1800s, a popular belief known as vitalism stated that life processes could not be explained by the laws of physics and chemistry, and were instead dictated by an independent life force. Which discovery most likely caused scientists to revise this hypothesis regarding the origin of life on Earth
The question is incomplete, the complete question is;
In the 1800s, a popular belief known as vitalism stated that life processes could not be explained by the laws of physics and chemistry,and were instead dictated by an independent life force. Which discovery most likely caused scientists to revise this hypothesis regarding the origin of life on Earth?
a. that inorganic compounds existed within live organisms
b. that organic compounds could be synthesized in a laboratory
c. that RNA could serve as a template to synthesize DNA
d. that self-replicating molecules existed inside cells
Answer:
b. that organic compounds could be synthesized in a laboratory
Explanation:
Vitalism is the belief that "living organisms are fundamentally different from non-living entities because they contain some non-physical element or are governed by different principles than are inanimate things"(wikipedia).
This theory held that the molecules involved in life processes could not be synthesized in the laboratory.
All these were upturned after Fredrich Whöler's synthesis of urea in 1828. He was able to show that molecules involved in life process can also be synthesized in the laboratory. This gave rise to modern synthetic organic chemistry.
NO(g) and O2 (9) react to form NO2(9). The rate law of the reaction is rate = k[NO]° [02]. If the reaction occurs in a single elementary step that is a three-body molecular collision, then which of the following is the equation for the elementary step?
Answer:
B, 2NO + O2 --> 2NO2
Explanation:
The exponents in the rate law for an elementary step are equal to the stoichiometric coefficients of the particles in the equation for the elementary step. Therefore, the elementary reaction must be between two NO molecules and one O2 molecule.
The elementary reaction of the three-body molecular collision is 2NO + O2 -----> 2NO2
The rate of reaction refers to how fast or slow a reaction occurs. The rate equation for an elementary reaction involves the concentration of the species raised to the power of their respective molar coefficients.
We are told that the rate law of the reaction is given as; Rate = k[NO]^2 [O2]. This implies that the single elementary step that is a three-body molecular collision, is represented by the equation; 2NO + O2 -----> 2NO2.
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What is the mole ratio of hydrogen to nitrogen in the following reaction: N2(g) + 3H2(g) →
2NH3(8)
Answer:
3 mol H2/2 mol N2
Explanation:
Mole ratios are basically from the numbers/coefficients in front of the element
i don’t really know anything about this so i need help
Answer:
D. a new substance is formed.
Explanation: "Chemical reactions involve combining different substances. The chemical reaction produces a new substance with new and different physical and chemical properties. Matter is never destroyed or created in chemical reactions. The particles of one substance are rearranged to form a new substance." B. and C. are two different effects of chemical reaction, but not for all. Hope this helps ^-^.
The density of pure water is 1 kg/L. After you calculated the density of material, how would you know if the object would sink or float without placing it in water?
Explanation:
After calculating the density of the material we can tell if the object will sink or float without placing it in water by comparing their density.
The density of water is given as 1kg/L If the density of the material is greater than the density of water, the material will sink. If the density of the material is less than the density of the water, it will float.This way, comparing the density values of both substances can tell us whether they will float or sink.
What volume (L) will 3.56 mol NH3 occupy at STP. (1 point)
A 0.159 L NH3
B 79.7 L NH3
C 157 L NH3
D 0.0809 L NH3
Answer:
B
Explanation:
I hope it helps you good luck
