Please help me with this homework
Answer:
Explanation:
Melting example:
Melting chocolate
Freezing example:
Freezing water to ice
Boiling example:
Water boiled in a kettle
Condensation example:
Steam from your bath/shower condenses onto the mirror
Hope this helps :)
What controls the movement of material between the inside of the cell and the outside world?
Group of answer choices
Nucleus
Cell membrane
Cytoplasm
Vacouoles
Answer:
Cell membrane
Explanation:
If 2 moles of salt is dissolved to form 1 liter of solution, what is the molarity of the solution?
Answer:
2M
Explanation:
Molarity refers to the molar concentration of a solution. It can be calculated by using the formula as follows:
Molarity (M) = number of moles (n) ÷ volume (V)
Based on the information provided in this question, 2 moles of salt is dissolved to form 1 liter of solution. This means that n = 2mol, V = 1L
Molarity = n/V
Molarity = 2/1
Molarity = 2M
C + O2 CO2
1. When solid carbon reacts with 64.0 g of oxygen gas to form carbon dioxide, no carbon or oxygen is left over. How much carbon is reacted if 88.0 grams of carbon dioxide is produced? A 24.0 g B 64.0 g C 88.0 g D 112.0 g
no. of mole = 88 ÷ ( 12 + 2(16) )
= 2 mol
mass of C = 2 × 12
= 24g ( A )
If you have 730 moles of a gas at 304 Kelvin in a 4.50 Liter container what
is the pressure of that eas in atmospheres?
Answer:
4046atm
Explanation:
For this question you can use the ideal gas law,
[tex]PV=nRT[/tex]
Where P is pressure, V is volume, n is moles of substance, R is the constant, and T is the temperature.
Because of the units given, R will equal .08026[tex]P=4046 atm[/tex]
Rearrange the equation to solve for pressure:[tex]P=\frac{nRT}{V}[/tex]
Then, plug in the values (I'll be excluding units for simplicity, but they all cancel out for pressure in atm):
[tex]P=\frac{(730)(.08206)(304)}{4.5}[/tex]
This will give you:
[tex]P=4046atm[/tex]
Indicate which aqueous solution has the highest boiling point elevation. (Kb for water = 0.512 °C/m)
Answer:
carbon tetrachloride
Explanation:
Boiling point elevation of a liquid or a compound is defined as the boiling point of a liquid that is that will be higher when some other other compound is added. It means that the solution has a higher boiling point than the solvent. When a non volatile solute is added to the pure solvent like water, it results in the highest boiling point elevation.
Carbon tetrachloride, Kb = 5.03°C/m shows highest boiling point elevation when it is used to make a 0.10 m non - electrolyte solution.
given the equation, N2H4 + N2O4 -> N2 + H2O, how many moles of N2)=O4 are needed to react with 3.5 moles of N2H4
Answer:
Explanation:
I think you mean
2N2H4 + N2O4 ==> 3 N2 + 4H2O
The equation says that for Every mol of N2O4, you need 2 moles of N2H4.
1/2 = x/3,5 Multiply both sides by 3.5
3.5*1 / 2 = x
1.75 = x
Therefore you need 1.75 moles N2O4 are needed for 3.5 moles of N2H4
Which of the following is a nonrenewable energy source that comes from the remains of dead
organisms?
a. Gasoline
b. Solar power
c. Geothermal heat
d. Hydroelectricity
Answer:
Gasoline
Explanation:
Coal, oil, and gas are all fossil fuels made from the remaisn of dead organisms.
People should be more concerned about the global water budget than the local water budget.
True
Or false
How many grams are there in 2.5 moles of C2H5OH?
2.5 moles of C2H5OH would be 115.175 grams of the same compound.
Recall that:
Mole = mass/molar massHence,
mass = mole x molar massMolar mass of C2H5OH = 46.07
Mass of 2.5 moles of C2H5OH = 2.5 x 46.07
= 115.175 grams
More on moles and mass can be found here: https://brainly.com/question/2076834?referrer=searchResults
I have to re ask this but pls help me I don't have a lot of time
Answer:a
Explanation:
Answer:
Hello there!
If i'm doing this correctly it is A (125 g).
Hope that helped, if I wasn't correct feel free to tell me.
Have a great day!
Ammonia (NH3) dissolved in water is heated in a beaker. If initially there had been 60 grams dissolved in 100 grams of water, what would happen if the temperature reached 90℃ and why? A. The solution would become supersaturated and the ammonia would all remain dissolved . B. The solution would become saturated but the amount of ammonia dissolved would remain the same . C. about 50 more grams of ammonia would be able to dissolve as the solution has become unsaturated . D. about 50 grams of ammonia would come out of solution as the temperature caused the solubility to decrease .
Answer:
C. About 50 more grams ammonia would be able to dissolve as the solution has become unsaturated
Explanation:
From the question, we have;
The mass of ammonia dissolved in water = 60 grams
The mass of the water solvent which dissolves the ammonia = 100 g
The temperature to which the ammonia water solution is raised = 90°C
Therefore, given that the solubility of a solute in a solvent increases with temperature, when the temperature is raised, we have, that the solution will more unsaturated and will be able to dissolve more ammonia, therefore, option 'C' is the most correct option that corresponds with the relationship of temperature and solubility
Can mixtures and compounds be separated into their elements? If so which?
Answer:
The individual components of a mixture can be physically separated from each other. Chemical compounds are very different from mixtures: The elements in a chemical compound can only be separated by destroying the compound.
How many atoms are in 17 moles of O?
Answer:
67
Explanation:
A rigid container of oxygen has a pressure of 3.5 atm and a temp of 713K, what is the pressure at 273K?
Answer:
Explanation:
This is most easily solved using Gay-Lussac's Law, which relates temperature and pressure as follows:
[tex]P_{1} T_{1} =P_{2} T_{2}[/tex]
According to Gay-Lussac's law, the pressure of oxygen gas at 273 K is 1.34 atmospheres.
Gay- Lussac's law is defined as a gas law which states that the pressure which is exerted by the gas directly varies with its temperature and at a constant volume.The law was proposed by Joseph Gay-Lussac in the year 1808.
The pressure of the gas at constant volume reduces constantly as it is cooled till it undergoes condensation .Given by P₁/T₁=P₂/T₂ which on substitution gives P₂=3.5×273/713=1.34 atm.
Thus, the pressure of oxygen gas at 273 K is 1.34 atmospheres.
Learn more about Gay-Lussac's law,here:
https://brainly.com/question/2683502
#SPJ2
What is the relationship between atmospheric
pressure and vapor pressure at the boiling point of
a liquid?
a. The atmospheric pressure is equal to the
vapor pressure at the boiling point.
b. The atmospheric pressure is less than the
vapor pressure at the boiling point.
C. The atmospheric pressure is greater than
the vapor pressure at the boiling point.
d. Both Band C are correct.
On a phase change diagram, such as a heating or cooling curve, the horizontal line
indicates a time when the temperature of the substance is staying the same.
True or false
Through photosynthesis, plants use the energy in sunlight to convert water and
carbon dioxide into sugar and oxygen. Has a chemical or physical change occurred?
Explain your answer.
Answer:
chemical change occured
The balanced chemical equation below shows the reaction between nitrogen (N2) and hydrogen (H2) to form ammonia (HN3).
N2 + 3H2 → 2NH3
If 10.0 grams of nitrogen reacts with hydrogen to form 12.0 grams of ammonia, then how many grams of hydrogen were used in this
Answer:
hope u umderstood ! if explanation needed then conta t
Nitrogen and hydrogen react to form ammonia and is a combination reaction. The grams of hydrogen used in the reaction with nitrogen to form ammonia is 2.0 grams.
What is mass in grams?Mass is the weight or the product of the volume and density of the substance. It can be calculated as, [tex]\rm volume \times density.[/tex]
Given,
Mass of nitrogen = 10.0 grams
Mass of ammonia = 12.0 grams
Mass of hydrogen = x gram
Solving for x:
[tex]\begin{aligned}\rm 10 + x &= 12\\\\\rm x &= 12.0 - 10.0\\\\&= 2.0 \;\rm grams\end{aligned}[/tex]
Therefore, 2.0 grams of hydrogen is required to react with 10.0 grams of nitrogen to produce 12.0 grams of ammonia.
Learn more about mass here:
https://brainly.com/question/6699336
3. Some of the reagents used in this lab are easily confused: such as persulfate (S208?)
and thiosulfate (S20:2). A student inadvertently switched these reagents, adding the
persulfate to beaker A and thiosulfate to beaker B. How would this affect the results?
What would the student observe with respect to the mixture in beaker A?
Answer:
Different compounds are formed.
Explanation:
Due to this switching of chemicals, the result of both beakers will be different because the chemicals react with the different solution in the beaker. The composition of both chemicals are different from one another which produces different compounds or products when they are mixed with the solution so we can say that this switching of chemicals will definitely affect the results of the experiment. The student will observe the formation of different compounds and different colour of the solution.
Please help me with this
Answer:
no se
ablar inglés losiento princesa
por que todo me sale en inglés?
Explicación?:
how many years can carbon dioxide stay in the atmosphere formed
Once it's added to the atmosphere, it hangs around, for a long time: between 300 to 1,000 years. Thus, as humans change the atmosphere by emitting carbon dioxide, those changes will endure on the timescale of many human lives.
I need help with this question please asap I would really appreciate it
Answer:
I think c
Explanation:
heelp me pls :P ( rando words )
The double bonds in an aromatic ring are not fixed in position as in an alkene. The electrons are considered to be ____ and are delocalized around the ring.
Answer: The double bonds in an aromatic ring are not fixed in position as in an alkene. The electrons are considered to be in conjugation and are delocalized around the ring.
Explanation:
Chemical compounds that have conjugated planar ring systems where there are delocalized pi-electron clouds are present in place of individual alternate and single bonds.
This means that electrons present in a double bond of alkene are in conjugation.
Therefore, we can conclude that the double bonds in an aromatic ring are not fixed in position as in an alkene. The electrons are considered to be in conjugation and are delocalized around the ring.
Answer:
In resonance
Explanation:
Got it right on Acellus.
PLEASE HELP ME, I AM DESPERATE
Explanation:
for the first one go to the website mathaway and just put the equation in and you would press graph.
What change releases energy.
Answer:
When a substance changes states, it requires energy when it goes to a higher energy state and releases energy when it goes to a lower energy state. Gas has a higher energy than liquid and liquid has a higher energy than solid. The three state changes from a lower energy to a higher energy are: solid to liquid: fusion. liquid to gas: vaporization
Which statement is true about this fuel cell?
It is self contained like a battery.
It continually needs to be charged.
It has an electrolyte that acts as a salt bridge.
It does not require the input of fuels from an outside source.
The statement which is true about the fuel cell is that It has an electrolyte that acts as a salt bridge.
What is Fuel cell ?A fuel cell is an electrochemical cell that converts the chemical energy of a fuel (often hydrogen) and an oxidizing agent (often oxygen) into electricity.
The fuel cell has an electrolyte that acts as a salt bridge.
As electrolytes are nothing but the salts which are present at the inner side of the U-Tube considered as Salt bridge present in fuel cell.
In this way, Fuel cell has electrolyte that acts as a salt bridge.
learn more about salt bridge here ;
https://brainly.com/question/14969258
#SPJ1
Write a balanced equation for the complete combustion of propane gas, C3H8, with
oxygen, O2, to form carbon dioxide, CO2, and water, H2O?
Answer:
Explanation:
Balancing Carbon atoms on the right side,
Balancing Hydrogen atoms on the right side,
Balancing Oxygen atoms on the left side,
The reactants are on the left side of the reaction:
Propane and oxygen are the reactants.
The products are on the right side of the reaction:
Carbon dioxide and water are the products.
forgive me if im incorrect or leaving things out
What is the formula for the compound formed by Ca2+ and N3-?
NCa
Ca3N2
O Can
O N2Caz
O N3Ca2
O CazN3