Answer:
chemical formula of isopropyl alcohol can also be written as: C3H7OH, CH3CHOHCH3 or (CH3)2CHOH.
chemical formula of ethanoic acid is CH₃COOH.
Name one similarity and one difference between visible light and sound.
Answer:
Light and sound both are waves, but sound requires a material medium to travel, and hence cannot travel in empty space while light can travel through vacuum but not through opaque materials. Both undergo refraction, diffraction and interference.
Explanation:
Chemistry B Semester Exam
An unknown substance has a boiling point of 174°C. Which statement is true about this unknown substance? (1 point)
-It has a lower boiling point than water, and it likely has stronger electrostatic forces between its molecules
than water.
-It has a higher boiling point than water, and it likely has stronger electrostatic forces between its molecules
than water.
-It has a lower boiling point than water, and it likely has weaker electrostatic forces between its molecules
than water.
-It has a higher boiling point than water, and it likely has weaker electrostatic forces between its molecules
than water.
Answer:
See below
Explanation:
Boiling point of water is 100 C
this substance is higher boiling point and the molecules are likely with higher e-static forces
The unknown substance has a higher boiling point than water, and it has stronger electrostatic forces between its molecules than water. Therefore, option B is correct.
Boiling point is a measure of the temperature at which a substance changes from a liquid to a gas phase. Substances with higher boiling points generally have stronger intermolecular forces, such as hydrogen bonding or stronger dipole-dipole interactions.
Since the boiling point of the unknown substance is higher than that of water (which boils at 100°C), it suggests that the unknown substance likely has stronger electrostatic forces between its molecules compared to water.
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chemistry can someone solve this?
eimetchuinsumuleavtubronAnswer:
Explanation:
determine the number of gram of gas produced when 4.66 mole of water produced from the complete combustion of butane
.we can read the chemical preparation of the reaction as: "4 g of hydrogen react with 32 g of oxygen to give 36 g of water". :)
Monosaccharides and disaccharides are what kind of molecules?
Answer:
They are small molecules
Explanation: Hope this helps
Answer: C) Carbohydrates
Explanation:
A) Lipids
B) Nucleic acids
C) Carbohydrates
D) Proteins
apex
how many oxygen molecules make up ozone
A scientist stores a very large number of particles in a container. In order to determine the number of particles, the scientist measures the temperature, pressure, and volume of the container and calculates the moles using the ideal gas law. In order for the calculated value to have the greatest accuracy, the scientist should make sure that (select all the apply)
A the temperature is high
B the volume is high
C the pressure is high
D the ideal gas law is always accurate, the conditions will not matter
When the temperature and the volume of the gas stored in the container are high then the number of the moles will be measured accurately. Thus, options A and B are correct.
What is the ideal gas law?The ideal gas law is the establishment of the relation between the elements like the moles, pressure, temperature, and the volume of the gas containing the particle.
The ideal gas states:
PV = nRT
With an increase in the temperature, the number of particles that collides increases as the kinetic energy increases. The particle of the container is more when the volume of the gas is more.
Therefore, in options A and B high temperature and volume increase the accuracy.
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0.58 mol of Mg contains how many atoms? please show work
The number of atoms present in 0.58 mole of magnesium, Mg is 3.49×10²³ atoms
Avogadro's hypothesis1 mole of Mg = 6.02×10²³ atoms
How to determine the atoms in 0.58 mole of Mg1 mole of Mg = 6.02×10²³ atoms
Therefore,
0.58 mole of Mg = 0.58 × 6.02×10²³
0.58 mole of Mg = 3.49×10²³ atoms
Thus, 3.49×10²³ atoms are present in 0.58 mole of Mg
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describe a weather station that will be used to collect weather data it should collect data that are needed to make forecasts. explain what data are needed how the station would be powered and any other relevant information . Then sketch it out
(please draw a sketch arigato)
The weather station is a place which contain instrument that collect data of atmospheric pressure, wind, humidity, etc to forecast weather. The weather station is powered by solar power.
What is a weather station?A weather station is a place that measure atmospheric conditions, on the basis of temp., pressure, wind speed, etc conditions.
They can be based either in land or sea. They are necessary to forecast any disaster, so we can prepare for the disaster.
Thus, the weather station is a place which contain instrument that collect data of atmospheric pressure, wind, humidity, etc to forecast weather. The weather station is powered by solar power.
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Please help!
Given the equation representing a reaction
Which statement explains the energy term in this reaction?
Answer: 3. Mass is lost due to the conversion of mass to energy.
100 POINTS! Final Honor Activity Question
An unbreakable meteorological balloon is released from the ground. Ground level pressure is 98.5 kPa and the temperature is 18oC. The balloon contains 74.0 dm3 of hydrogen gas. As the balloon ascends, the pressure drops to 7.0 kPa.
What is the new volume of the balloon, assuming no temperature change?
If a temperature drop of 80oC occurs, what is the new volume of the balloon?
Of the two factors, pressure and temperature, which had the greatest effect in changing the volume of the balloon? Support your answer with your calculations.
Approximately 160 km above the Earth the pressure of the atmosphere is about 3.00 x 10-4 Pa and the temperature is about -180oC. If 100 cm of a gas at STP is released at this distance from the Earth, what volume would it occupy?
The change in temperature had the greatest effect at changing the volume of the balloon.
What are the gas laws?The gas laws are used to describe the parameters that has to do with gases.
Given that;
P1 = 98.5 kPa
T1 = 18oC or 291 K
V1 = 74.0 dm3
P2 = 7.0 kPa
V2 = ?
T2 = 18oC or 291 K
P1V1/T1 = P2V2/T2
P1V1T2 =P2V2T1
V2= P1V1T2/P2T1
V2 = 98.5 kPa * 74.0 dm3 * 291 K/ 7.0 kPa * 291 K
V2 = 1041.3 dm3
When;
V1 = 1041.3 dm3
T1 = 291 K
V2 = ?
T2 = 80oC or 353 K
V1/T1 = V2/T2
V1T2 = V2T1
V2 = V1T2/T1
V2 = 1041.3 dm3 * 353 K/291 K
V2 = 1263 dm3
The change in temperature had the greatest effect at changing the volume of the balloon.
Given that
V1 = 100 cm^3
T1 = 273 K
P1 = 1.01 * 10^5 Pa
V2 = ?
P2 = 3.00 x 10^-4 Pa
T2 = -180oC or 255 K
V2= P1V1T2/P2T1
V2 = 1.01 * 10^5 Pa * 100 cm^3 * 255 K / 3.00 x 10^-4 Pa * 273 K
V2 = 3.14 * 10^10 cm^3
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The magnet below is cut in half. What will be the result
the cut pieces will have their own north and south pole
What reaction is 2KCLO3 2KCI + 3O2
Answer: Decomposition
Explanation:
Which of the following is the correct set-up for the problem: How many grams of water will be produced from 3.2 moles of oxygen and an excess of C2H4?
Option C is the correct set of the problem for mass of water produced by 3.2 moles of oxygen and an excess ethene.
Reaction between oxygen and etheneEthene (C2H4) burns in the presence of oxygen (O2) to form carbon dioxide (CO2) and water (H2O) along with the evolution of heat and light.
C₂H₄ + 3O₂ ----- > 2CO₂ + 2H₂O
from the equation above;
3 moles of O₂ ---------> 2(18 g) of water
3.5 moles of O₂ ----------> x
[tex]x = 3.2 \times [\frac{2 \ moles \ H_2O}{3 \ moles \ O_2} ] \times[ \frac{18.02 \ g \ H_2O}{1 \ mole \ H_2O} ][/tex]
Thus, option C is the correct set of the problem for mass of water produced by 3.2 moles of oxygen and an excess ethene.
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what is chemistry
please help ASAP
Answer: Chemistry is the study of matter and the changes it undergoes.
An example of chemistry being used in the real world is how an ECG works. Chemistry is also sometimes considered the "central science". I hope this answer helped!! :)
You have now identified whether crabs are able to see plankton they eat near the ocean floor. Based on your answer, explain how this information can be used to help the Australian Institute of Marine Biology further to understand the environment of the ocean floor (what other organisms live at the bottom? How are these able to see their food/ attract food to survive?
They are able to find out more organisms which are present at the bottom of the sea due to their accomplishment.
How this information can be used to help to understand the environment of the ocean floor?This information can be used to help the Australian Institute of Marine Biology further to understand the environment of the ocean floor because they are able to see the seas floor and can find out other creatures as well.
So we can conclude that they are able to find out more organisms which are present at the bottom of the sea due to their accomplishment.
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b. The sedative Demerol hydrochloride has the formula
C15H22CINO2. How many grams are in 0.025 mole of
Demerol hydrochloride?
Dinitrogen oxide (or nitrous oxide), N₂O, also known as
laughing gas, is widely used as an anesthetic in dentistry.
The number of grams present in 0.025 mole of Demerol hydrochloride is 7.094 grams.
What is Demerol hydrochloride?It is a drug used in treating severe or moderate pain.
The moles are given = 0.025
The formula is C₁₅H₂₂CINO₂
The elements that present are C, H, Cl, N, O.
The molecular weight are given:
Carbon: 12.0107
Hydrogen: 1.00784
Chlorine: 35.453
Nitrogen: 14.007
Oxygen: 15.999
Multiply the molecular weight with moles and add them
(15 x 12.0107) + (22 x 1.00784) + (1 x 35.453) + (1 x 14.007) + (2 x 15.999) = 283.79098 grams per mole.
Now, multiply the number of moles given with the total molecular weight
283.79098 x 0.025 = 7.094
Thus, the number of grams are 7.094.
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does hot ice have to be cold or hot?
Answer:
hot
Explanation:
You'll need to boil the solution, though, to reduce the amount of water so that it is concentrated enough to form crystals. Cook your solution over low to medium heat for about an hour. You want to reduce it down to 1 cup or less.
Why we use cotton cloth to mop the floor?
Answer:
because cotton have a good absorbing quality and can absorb water more which is used to mop the floor
Explanation:
How many moles of aluminum do 6.4×1024 aluminum atoms represent?
Answer:
11 moles Al
Explanation:
To find the amount of moles, you need to use Avogadro's number to convert the atoms to moles. Since the value you were given has 2 significant figures, the final answer should also have 2 sig figs.
Avogadro's Number:
6.022 x 10²³ atoms = 1 mole
6.4 x 10²⁴ atoms Al 1 moles
---------------------------- x ------------------------------ = 10.6 moles Al
6.022 x 10²³ atoms
= 11 moles Al
Calculate the how many sodium atoms must react completely to give 33,6 dm³ hydro-
gen gas at STP.
2Na+ 2H₂O → 2NaOH + H₂(g)
To give 33.6 dm³ hydrogen gas at STP, 18.06 x 10²³ atoms of Na must react completely.
What is Mole concept ?A mole is a unit of measurement used to measure the amount of any fundamental entity (atoms, molecules, ions) present in the substance.
As according to the given equation, 2 moles (ie 12.04 x 10²³ atoms) of Na-atoms produces 1 mole (22.4 ltr) of H₂-gas.
Hence, to produce 33.6 ltr (equivalent to 33.6 dm³) of H₂-gas produced by ;
= 12.04 x 10²³ atoms of Na / 22.4 ltr of H₂-gas x 33.6 ltr
= 18.06 x 10²³ atoms of Na
Hence, To give 33.6 dm³ hydrogen gas at STP, 18.06 x 10²³ atoms of Na must react completely.
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Which factors affect heat transfer between a warm and a cool substance?
the time it took to heat the substance, the area of contact, and the specific heats of the substances
O the amount of time of contact, the area of contact, and the specific heats of the substances
O the time it took to heat the substance, the area of the substances, and the specific heats of the substa
O the amount of time of contact, the area of the substances, and the specific heats of the substances
The amount of time of contact, the area of contact, and the specific heats of the substances. Hence, option A is correct.
What are specific heats?The heat in calories is required to raise the temperature of one gram of a substance one degree Celsius.
Factors that affect the rate of heat flow include the conductivity of the material, the temperature difference across the material, the thickness of the material, and the area of the material.
Different materials have greater or lesser resistance to heat transfer, making them better insulators or better conductors.
The amount of time of contact, the area of contact, and the specific heats of the substances.
Hence, option A is correct.
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Answer: The answer is C and D
B: If a substance undergoes a physical change, then it will retain most of its original properties because no new substance is formed.
C: If a substance undergoes a chemical change, then it will not retain its original properties because a new substance is formed.
Explanation: I took the test on edg
Light refracts because:
000
it is reflected at a focal point.
it changes speed.
its frequency does not match the object it is striking.
All of the choices are correct.
Unit 1
Refraction is caused due to the change in speed of light when it enters from one medium to another. Hence, option B is correct.
What is refraction?Refraction happens when light changes direction, or bends when it moves from one material to another.
The cause of the refraction of light is that light travels at different speeds in different media.
This change in the speed of light when it moves from one medium to another causes it to bend.
Thus, refraction is caused due to the change in speed of light when it enters from one medium to another. Hence, option B is correct.
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Heat that flows by conduction is the transfer of thermal energy between substances in contact. What must occur for this to happen? A. The two systems must be the same temperature.
B. The two systems must not be touching each another.
C. One system must have higher kinetic energy than the other system.
D. The thermal energy of one system must be the same as the thermal energy of the other system.
Answer:
c. one must have a higher kinetic energy than the other system
What is the formula for the carboxylic acid functional group?
OA. -CH3
OB. -COH
0 с. -соон
OD. -CO-
Answer: C
Explanation:
This is a fact.
Consider 2.00 moles of Argon, an ideal gas, at a density of 5.00 g/L and a pressure of 2.00 atm. What is the closest value to the temperature (in K) of this gas?
Answer:
194.73 K
Explanation:
Use the Ideal Gas Law: PV = n RT
R = .082057366 L Atm / k-mole
2 moles Argon weigh in at 79.896 gm
79.896 gm / 5 gm/L = 15.9792 Liters
Ideal Gas Law:
(2)(15.9792) = 2 (.082057366) ( K)
194.73 K
Considering 2.00 moles of Argon, an ideal gas, at a density of 5.00 g/L and a pressure of 2.00 atm, the closest value to the temperature of the gas is approximately 39.01 K.
To find the temperature of the gas, we can use the ideal gas law equation:
PV = nRT
In this formula:
P = pressure (in atm)
V = volume (in L)
n = number of moles
R = ideal gas constant (0.0821 L·atm/mol·K)
T = temperature (in K)
Here it is given that:
P = 2.00 atm
V = 1 L
n = 2.00 moles
R = 0.0821 L·atm/mol·K
Now we can rearrange the equation to solve for T:
T = PV / (nR)
Substitute the given values:
T = (2.00 atm) x (16.00 L) ÷ (2.00 moles x 0.0821 L·atm/mol·K)
Calculate:
T ≈ 39.01 K
Thus, the closest value to the temperature of the gas is approximately 39.01 K.
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Question 2
2C4H10 + 1302 -> 8CO2 + 10H₂O
If 2.46 g H₂O are produced by a reaction, how many moles of C4H10 were used?
Answer:
2 mole of C4H10 were used in this reaction.
Which scientist performed the cathode ray experiment leading to the discovery of electrons
The scientist that performed the cathode ray experiment leading to the discovery of electrons is J.J. Thomson.
What is a cathode ray?A cathode ray is a tube that contains negatively charged electrode( that is the cathode) which emits electrons when heated at a low pressure.
The cathode ray was used by the scientist, J.J. Thomson to find the ratio of charge to mass (e/m) of the electrons.
Therefore, the scientist that performed the cathode ray experiment leading to the discovery of electrons is J.J. Thomson.
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An atom of an element is shown by the model.
How is the model useful
Answer:
I believe it is useful as it shows how electrons are distributed in the shells (energy levels) of an iron atom. An atom is the smallest particle of an element that can take part in a chemical reaction. It contains the nucleus and the shells (energy levels). the nucleus contains protons and neutrons while the shells contain electrons.
Explanation:
Given the unbalanced equation which represents aluminum metals reacting with an acid:
Al + H+ → Al+3 + H₂
What is the total number of moles of electrons lost by 1 mole of aluminium?
There are three number of electrons lost by 1 mole of aluminium because aluminum has +3 charge on it.
What is cation?When an atom loses electron, positive charge appears on the atom this is called cation. In this reaction we can see that aluminium has +3 charge which means that it loses 3 electrons.
So we can conclude that There are three number of electrons lost by 1 mole of aluminium because aluminum has +3 charge on it.
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