Answer:
Permanent = false
Explanation:
All of the other choices are true
3) Convert 0.987 moles of Lithium to grams.
Answer:
6.850767 grams is the answer
[tex]0.987 ~ \text{moles of Li} = 0.987 \times \text{Molar mass of Li}\\\\~~~~~~~~~~~~~~~~~~~~~~~=0.987 \times 6.941~ g\\\\~~~~~~~~~~~~~~~~~~~~~~~=6.850767~ g[/tex]
what type of solution forms when 25g of NaCI are dissolved in 100g of water at 30 degrees c
An unsaturated solution is formed when 25g of NaCI are dissolved in 100g of water at 30 degrees Celsius.
What is an unsaturated solution?A solution is formed as a result of the dissolution of a solute in a solvent.
However, based on the capacity of the solvent to take in more solute, a solution can be of three types namely;
Unsaturated solutionSaturated solutionSupersaturated solutionAn unsaturated solution is a solution whose solvent can dissolve more solute at a particular temperature.
According to this question, 25g of NaCI are dissolved in 100g of water at 30°C, hence, the solvent can take in more solute at 30°C.
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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:
The magnet below is cut in half. What will be the result
the cut pieces will have their own north and south pole
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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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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What reaction is 2KCLO3 2KCI + 3O2
Answer: Decomposition
Explanation:
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
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:
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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The number of moles of Cr deposited by passing 1,5 F electricity in following reaction Cr+3e–– ›cr is
The number of moles of Cr deposited by 1.5 F of electricity is 0.5 moles
What is electrolysis?The term electrolysis has to do with thee deposition of a solid when a direct current is passed through its solution.
Given the reaction; Cr3+(aq) + 3e ––›Cr(s)
If 3F of electricity is required to deposit 1 mole of Cr
1.5F of electricity is required to deposit 1.5F * 1 mole/3F
= 0.5 moles
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what effect does a catalyst have on a reaccion rate an the products formed in a reaccion
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:
Which of the following items represents a chemical change?
melting
evaporation
freezing
burning
Give the postional isomers of 2 halopropane
(CH3)2CH
Give the positional isomers of 2 halopropane
(CH3)2CH
answer:
is in file download it
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.
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.
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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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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chemistry can someone solve this?
eimetchuinsumuleavtubronAnswer:
Explanation:
PLEASE HELP!!!
Choose from the given list of aqueous solutions (A-D).
Solution A has [H3O+] = 3.5×10-5 M.
Solution B has [H3O+] = 3.5×10-4 M
Solution C has [OH-] = 1.3×10-10 M
Solution D has [OH-] = 6.2×10-11 M
Which solution is the least acidic?
Which solution has the highest pH?
Which solution is the most basic?
Which solution is the least basic?
Find pH of all
#A
pH=-log[H+]
pH=-log[3.5×10^{-5}]pH=-log3.5+5pH=4.4#B
pH=-log3.5+4pH=3.4#C
pOH=-log[OH]
pOH=-log[1.3×10^{-10}]pOH=-log1.3+109.8pH=
14-9.84.2#4
pOH=-log6.2+11pOH=10.2pH
14-10.23.8So our answers
solution A is least acidicsolution A has the highest pHsolution A is most basicsolution B is least basic100 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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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.
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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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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how many oxygen molecules make up ozone
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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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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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!! :)
Determine the mass of hydrogen gas collected in a container if the gas occupies
44.8 L at STP.
Answer:
Hope this helps kinda got confused mid way
Explanation:
So the hydrogen sulphide is H2S for the molecular formula. Then the mass of hydrogen sulphide would be 1×2+32= 34g/mol At STP.