Answer:
Your answer will be (D).
Hope this helps!
Answer:
D
Explanation:
You can tell when a chemical change occurs if a gas is produced (bubbles), an odor is produced, if there is a color change, or if the surroundings get hotter or colder.
HELP QUICK carbon dioxide makes up less than 1 percent of earths atmosphere, and oxygen makes about about 20 % These percentages are maintained most directly by what
Answer:
respiration and photosynthesis
Explanation:
The percentages of carbon dioxide and oxygen in Earth's atmosphere are maintained most directly by cellular respiration and photosynthesis.
What is photosynthesis?Photosynthesis simply refers to a biological and chemical process through which green plants convert light energy derived from the Sun into chemical energy, so as to make their food while using carbon dioxide (CO₂) and releasing oxygen.
On the other hand, cellular respiration is a series of metabolic reactions that occur in living cells and it involves the use of oxygen that are typically produced by green plants (autotrophs) during photosynthesis.
This ultimately implies that, the percentages of carbon dioxide (1%) and oxygen (20%) that are contained in Earth's atmosphere are maintained most directly by cellular respiration and photosynthesis.
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Be sure to answer all parts. Select the anti periplanar geometry for the E2 reaction of (CH3)2CHCH2Br with base. mc2x mc2xd1 mc2xans mc2xd2 Then draw the product that results after elimination of HBr. draw structure ...
The anti periplanar geometry for the E2 reaction of (CH3)2CHCH2Br with base is shown in the image attached as well as the structure of the product formed in the reaction.
In organic chemistry, an antiperiplanar conformation is one in which the groups point up and down at a dihedral angle of 180° away from one another. In the image attached, the antiperiplanar conformation of (CH3)2CHCH2Br is shown.
Recall that an E2 reaction is a synchronous elimination reaction where to atoms leave at the same time. The product of this reaction is also shown in the image attached.
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What is the balanced form of the chemical equation shown below?
C6H1206(s) + O2(g) → H20(1) + CO2(g)
-
+
A. C6H1206(s) + O2(g) → H2O(1) + CO2(9)
B. C6H1206(s) + 602(9) — 6H20() + 6C02(9)
C. CH2O(s) + O2(g) → H20(1) + CO2(9)
D. CH1206(s) + O2(g) – 12H20(1) + 6C02(9)
Answer:
B. C6H1206(s) + 602(9) → 6H20(l) + 6C02(9)
Explanation:
You can see that it's balanced;
C6H1206(s) + 602(g) → 6H20(l) + 6C02(g)
C ⇒ 6 C ⇒ 6
H ⇒ 12 H ⇒ 6 x 2 = 12
O ⇒ 6 + (6 x 2) = 18 O ⇒ 6 + (6 x 2) = 18
Write a five-sentence paragraph describing the nature and background of basketball.
Answer:
The history of basketball began with its invention in 1891 in Springfield, Massachusetts by Canadian physical education instructor James Naismith as a less injury-prone sport than football. Naismith was a 31-year old graduate student when he created the indoor sport to keep athletes indoors during the winters.
Explanation:
The history of basketball began with its invention in 1891 in Springfield, Massachusetts by Canadian physical education instructor James Naismith as a less injury-prone sport than football. Naismith was a 31-year old graduate student when he created the indoor sport to keep athletes indoors during the winters.
What is the volume of 0.1 M HCl required to neutralize 12.0 mL of 0.25M
Ba(OH)2?
Answer:
15ml
4HCl + 2Ba(OH)2 so moles ratio is 4:2
Is there a need for adhesives?
Answer:
yes
Explanation:
what would happen if the next time you needed tape or glue you remember, oh wait theres none at the house, thats just an example of why you would indeed need adhesives
I am not feeling well
I hope you feel better soon! :)
Ana was setting up a circuit to make a buzzer buzz. She didn’t have any wires, so she needed to find
something that had the same properties as wires. Which of the following would work for Ana’s circuit?
A. A steel knife
B. A wood chopstick
C. A plastic straw
D. A glass tube
Answer:
should be a or d, though im leaning towards d more. sadly can't narrow it down 100%. b nor c are correct since they are made out of wood and plastic which cannot allow electricity to pass by. copper and metal are effective conductors of electricity, which a steel knife and a glass tube is made out of.
The table shows the boiling points of fluorine, chlorine and bromine.
Element
Boiling point in °C
Fluorine
-186
Chlorine
-34
Bromine
+59
(c) Explain why the boiling points in the table are low.
Explanation:
the chemicals are group 7 elements and one of their characteristics is that the melting and boiling point increase progressively
The partial pressure of CO2 gas in a bottle of carbonated water is 4.60 atm at 25 ºC. How much CO2 gas (in g) will be released from 1.1 L of the carbonated water when the partial pressure of CO2 is lowered to 1.28 atm? At 25 ºC, the Henry’s law constant for CO2 dissolved in water is 1.65 x 103 atm, and the density of water is 1.0 g/cm3.
If the partial pressure of CO₂ in a bottle of carbonated water decreases from 4.60 atm to 1.28 atm, the mass of CO₂ released is 0.265 g.
The partial pressure of CO₂ gas in a bottle of carbonated water is 4.60 atm at 25 ºC. We can calculate the concentration of CO₂ using Henry's law.
[tex]C = k \times P = \frac{1.65 \times 10^{-3} M }{atm} \times 4.60 atm = 7.59 \times 10^{-3} M[/tex]
We can calculate the mass of CO₂ in 1.1 L considering its molar mass is 44.01 g/mol.
[tex]\frac{7.59 \times 10^{-3} mol}{L} \times 1.1 L \times \frac{44.01 g}{mol} = 0.367 g[/tex]
Now, we will repeat the same procedure for a partial pressure of 1.28 atm.
[tex]C = k \times P = \frac{1.65 \times 10^{-3} M }{atm} \times 1.28 atm = 2.11 \times 10^{-3} M[/tex]
[tex]\frac{2.11 \times 10^{-3} mol}{L} \times 1.1 L \times \frac{44.01 g}{mol} = 0.102 g[/tex]
The mass of CO₂ released will be equal to the difference in the masses at the different pressures.
[tex]m = 0.367 g - 0.102 g = 0.265 g[/tex]
If the partial pressure of CO₂ in a bottle of carbonated water decreases from 4.60 atm to 1.28 atm, the mass of CO₂ released is 0.265 g.
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The partial pressure of CO₂ gas in a bottle of carbonated water is 4.60 atm at 25 ºC. How much CO₂ gas (in g) will be released from 1.1 L of the carbonated water when the partial pressure of CO2 is lowered to 1.28 atm? At 25 ºC, the Henry’s law constant for CO₂ dissolved in water is 1.65 x 10⁻³ M/atm, and the density of water is 1.0 g/cm³.
Which of the following is an example of climate?
A. The polar regions have long winters and short, cool summers.
B. Humidity levels are high today.
C. Canada experienced an unusually warm summer this year.
D. Tornados formed across Oklahoma yesterday.
Answer:
A. The polar regions have long winters and short, cool summers.
Explanation:
Climate is location based, however is over long periods of time, so Canada would not be considered because it is only 1 summer
Identify three ways you could increase the rate of an aspirin tablet dissolving in a glass of water.
Answer:
If you are trying to dissolve a substance, you have three primary avenues to increase the dissolution rate: decreasing the particle size of the solid, increasing the temperature and/or increasing the mixing or stirring rate.
Explanation:
hello guyz who ever answers will get 100 pts
Answer:
hello,
Good morning have a good day
Jason and Sheldon are neighbors who work for the same accounting firm. They leave the office at the same time. After t seconds, Jason's distance from the office in meters is given as 4 more than 3 times t, while Sheldon's distance from the office is 6 more than 2 times t.
The function that represents the total distance d(t) that Jason and Sheldon cover together in t seconds is given by d(t) =
. In 7 seconds, Jason and Sheldon together cover a distance of
meters.
What kind of fault movement will create a tsunami?
Answer:
I THINK IT'S BECAUSE THE EARTH UNDER THE SEA SHIFTS AND THE VIBRATION OF THE WATER GETS BIGGER UNTIL IT BECOMES A TSUNAMI. BRAINLIST ???
Which best describes the energy change that takes place during deposition?
Heat energy released by the substance
Heat energy is maintained by the substance
Heat energy is slowly gained by the substance
Heat energy is quickly absorbed by the substance
Answer:
heat energy released by the substance
The energy change that takes place during deposition is that heat energy is released by the substance. This statement is true about deposition.
Deposition is a phase transition that occurs when a gas is converted directly to a solid without passing through the liquid state. During deposition, energy is released by the gas particles and absorbed by the surface, resulting in a decrease in the energy of the gas particles and an increase in the energy of the surface particles.As a result, the substance releases heat energy as it changes from a gas state to a solid state.
Therefore, the correct option is:Heat energy released by the substance.
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The diagram shows the box for elements in the periodic table. What is the atomic number of the element shown. A. 27.0 B. 40.0 C.26 D.13
I think it is B.40.0
Because if you do 27+13=40
It will give 0.
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
The atomic number of the shown element Al (Alluminium) is ~
[tex]13[/tex]Explanation:
atomic number = no. of protons = 13
therefore atomic number of aluminium is 13 as given
so option D 13 is correct option .
hope this answer helps you dear! take care
PLEASE ITS DUEE TODAY at 6:00PM!!!!!
Please draw the complete chemical structure of the tripeptide having the amino acidsequence: Asp-Leu-Ser
Answer:
I got you... 2 amino acids are linked to each other by a peptide linkage. A peptide linkage is formed when carboxyl group of one amino acid combine with the amine group of the other and during this process, a water molecule is removed.
The given tripeptide will have 2 peptide bonds. To draw the structure of given tripeptide, we will arrange them in the given order and then we will remove 2 water molecules to form 2 peptide bonds.
Explanation:
Hope this helps:)
Which of the following has kinetic energy?
O A compressed spring
O An arrow shot from a bow
O water in a reservoir at a hill top
O Amonkey hanging from a tree
Kinetic energy is energy that an object possesses due to its motion.
Lets look at each option:
A compressed spring has potential energy.
An arrow shot from a bow does have Kinetic energy.
Water in a reservoir at a hill top is potential energy.
A monkey hanging from a tree is potential energy.
This means that the answer is B) An arrow shot from a bow
I hope this helps! :)
According to law of conservation of energy,energy is converted from one form to another so by this fact an arrow shot from a bow has kinetic energy generated from potential energy.
What is law of conservation of energy?
According to law of conservation of energy, it is evident that energy is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Julius Robert Mayer in the year 1842.
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What is the empirical formula of CoH1803? (4 points)
-O CH30
-C₂H50
-C₂H₂O
-O C₂H5O5
Answer:
-O CH30
Explanation:
My Head Is About To Explode
Draw an example of a buffer in the body.
Explanation:
this is answer.
What is the concentration of chloride ions in solution after the reaction of 5.8 mL 0.12 M ammonium chloride with 3.2 mL 0.21 M silver nitrate
Answer:
ok
Explanation:
Ocean water Choose one: A. is less dense than freshwater. B. salinity decreases as seawater evaporates. C. contains dissolved salts, like halite and gypsum. D. has an average salinity of 35%.
Answer: the answer is C
Explanation:
Ocean water contains dissolved salts, like halite and gypsum. The correct option is C.
What is the ocean?The ocean is the salty water that covers an area of 70.08% of the total surface. It is a large body of water that covers the entire earth. There are seven oceans present with different names, and they are connected with each other. The ocean is one of the traveling routes for traveling and exporting and import of products.
The average salinity of the ocean is 3.5%. It contains salts, halite, and gypsum-like minerals and substances.
Thus, the correct option is C. contains dissolved salts, like halite and gypsum.
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How do the elements beryllium, carbon, and oxygen produce stars such as the Sun?
Answer:
Beryllium, carbon, and oxygen do not create stars like the sun. The sun is a massive cluster of hydrogen atoms being fused into helium atoms and heavier metals like Beryllium, carbon, and oxygen through the process of nuclear fusion. The more mass a star has in its core the more fusions that can occur and the heavier the metals inside can be fused into.
Explanation:
hope this helps. . . <3
good luck! uωu
*1. Which statement about the temperature of a phase changes in electrostatic forces holding the molecules is correct?
A. The temperatures of which a substance changes phases is dependent of the size of the molecules in the substance.
B. The strength of the forces between molecules in a substance depends on the number of filled electron shells.
C. The temperatures at which a substance changes phases indicate the relative strength of the forces between molecules in the substance.
D. The strength of the forces between molecules in a substance is the strongest at higher temperatures.
•
•
•
*2. Which list shows the phases of matter in order from strongest collective electrostatic forces to weakest collective electrostatic forces?
A. Gas, solid, liquid
B. Gas, liquid, solid
C. Liquid, solid gas
D. Solid, liquid, gas
•
•
•
*3. Which change happens when water boils?
A. The forces between water molecules become stronger, and the bonds between atoms in the water remain unchanged.
B. The forces between water molecules are unchanged, and the bonds between the atoms in a water break.
C. The force is between water molecules in the bonds between the atoms in the water molecules break.
D. The forces between water molecules break, and the bonds between the atoms in water are unchanged.
•
•
•
*4. A sample of calcium carbonate is cooled. Which change happens to the molecules of calcium carbonate in the sample?
A. The forces weaken, and the molecules move around.
B. The molecules break apart and then form stronger forces.
C. The forces strengthen, and the molecule structure becomes more rigid.
D. The molecules vibrate more and weaken the forces.
•
•
•
*5. The boiling point of acetone is lower than the boiling point of ethanol. Based on this information, which conclusion can be drawn about the two substances?
A. The intramolecular bonds in acetone are stronger than the intramolecular bonds in ethanol.
B. The intermolecular forces in ethanol are stronger than the intermolecular forces in acetone.
C. The intramolecular bonds in ethanol are stronger than the intramolecular bonds in acetone.
D. The intermolecular forces in acetone are stronger than the intermolecular forces in ethanol.
Answer:
see below
Explanation:
1. The temperatures at which a substance changes phases indicate the relative strength of the forces between molecules in the substance.
2. solid, liquid, gas
3. The forces between water molecules break, and the bonds between the atoms in water are unchanged.
4. The forces strengthen, and the molecule structure becomes more rigid.
5. The intermolecular forces in ethanol are stronger than the intermolecular forces in acetone.
The the degree of intermolecular interaction between molecules determines the magnitude of boiling point of the substance.
During phase change, a substance moves from one state of matter to another. The temperature at which a phase change occurs is determined by the strength of the forces between molecules in the substance. The relative magnitude of intermolecular forces between molecules in different states of matter is solids > liquids > gases.
During boiling, energy is imparted to the molecules of a liquid. When this occurs, the forces between water molecules break, and the bonds between the atoms in water are unchanged.
We must recall that the molecules of a substance are in constant random motion. The average kinetic energy of molecules is proportional to temperature. As a sample of calcium carbonate is cooled, the forces between molecules strengthen, and the molecule structure becomes more rigid.
The magnitude of intermolecular interaction affects the boiling point of a liquid. The stronger the magnitude of intermolecular interaction,the higher the boiling point. As such, ethanol having hydrogen bonds between its molecules has a higher boiling point than acetone which only posses weaker dipole - dipole interactions.
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a
A molecule that experiences London dispersion forces is
likely to have a • boiling point than a molecule
experiencing a dipole-dipole interaction.
pls
Answer:
it should be the second one since London dispersion causes interaction between molecules.
hope I helped.
Generally non ionic species with no polarity forms the London -dispersion bonds. London dispersion is weaker than the dipole-dipole interaction and hence it have less boiling point.
What is boiling point?Boiling point of a substance is the temperature at which the substance changes from liquid state to gaseous state or vapor where, the two states are in equilibrium.
Boiling of a substance depends on the molecular weight, bond type,temperature, pressure as well as purity of the substance.
London dispersion force is formed between two non-polar atoms. These atoms when come closer they attains a temporary polar nature and gets bonded.
Dipole-dipole bond is formed between two atoms of permanent dipole moment and they are polar compounds. Thus dipole-dipole interaction is stronger than London dispersion interaction. A strong bond needs more energy to boil.
Hence, molecules with Dipole-Dipole bond is having higher boiling point.
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What is the reaction between CCl4 and H2O?
Answer:
At temperatures > 400 °C, CCl4 reacts with H2O over a MgO catalyst to yield HCl and CO2.
acetone
56
turpentine
160
propane
-43
glycerin
290
In which substance are the electrostatic forces between molecules the strongest?
(1 point)
- propane
- turpentine
- glycerin
- acetone
The electrostatic forces between molecules of glycerin are the strongest.
We have 4 compounds with their respective boiling points.
acetone 56 °C turpentine 160 °C propane -43 °C glycerin 290 °CThe boiling point is the temperature at which a substance passes from the liquid state to the gaseous state.
A high boiling point indicates that the intermolecular forces are strong, so more energy is needed to separate the molecules in the vaporization.
Thus, glycerin, with the highest boiling point, is expected to have the strongest electrostatic forces between their molecules.
The electrostatic forces between molecules of glycerin are the strongest.
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Answer:
Glycerin
Explanation:
One type of sunburn occurs when skin is exposed
to UV light of wavelength in the vicinity of 315 nm.
What is the energy of a photon of this wavelength?
Answer:
E = 6.27 × 10⁻²³ Joules
Explanation:
E = h (Plancks constant) × f (frequency)
(Plancks constant = 6.63 × 10⁻³⁴ J×s)
f = λ × c (used to find frequency so you can satisfy energy equation)
*Have to find wavelength in meters to multiply by speed of light*
1. f = (3.15 × 10⁻⁷ m) × (3 × 10⁸ m/s)
2. f = 9.45 × 10¹⁰ s
3. E = (6.63 × 10⁻³⁴ J×s [Plancks constant]) × (9.45 × 10¹⁰ s)
E = 6.27 × 10⁻²³ Joules
1) When a beam of white rays is dispersed by a prism which colour will be refracted to a larger extent?
Explanation:
since diferentes colours of light través at diferentes speeds, the refractiva index is diferentes for each color. The result? that whenthe White light países thought the prism it cover into a red light