Answer:
7.82 g of Cu
Explanation:
2 moles of Al react to 3 moles of copper sulfate in order to produce 3 moles of copper and 1 mol of aluminum sulfate.
Firstly we determine the moles of reactant.
As copper sulfate is in excess, Al is the limiting.
2.75 g . 1mol /26.98g = 0.102 moles
Ratio is 2:3. 2 moles of Al, can produce 3 moles of Cu
So the 0.102 moles of Al will produce(0.102 . 3) /2 = 0.153 moles.
We convert moles to mass: 0.153 mol . 63.5g /mol = 9.71 g
That's the theoretical yield (100 % yield reaction)
We know that: (yield produced / theoretical yield) . 100 = percent yield
We replace:
(Yield produced / 9.71g) . 100 = 80.5 %
(Yield produced / 9.71g) = 0.805
Yield produced = 0.805 . 9.71g = 7.82 g
What is the iupac name of CH3-CH2-CH2-OH?
Answer:
the iupac name of CH3-CH2-CH2-OH Propanol.
CH4 + 2O2 --> CO2 + 2H2O
If you have 1 mole of CH4 and 6 moles of CO2 how many moles of CO2 and H2O will be produced?
Answer:
1 mole of CO2 and 2 mole H2O will be produced in the reaction.
Explanation:
N:B: I guess it will be 6 moles of O2 not CO2.
Balanced Equation: CH4 + 2O2 --> CO2 + 2H2O
Given,
1 mole CH4
6 moles of O2
According to Stoichiometry,
In the reaction,
2 mole O2 reacts with 1 mole CH4
1 mole O2 reacts with 1/2 mole CH4
∴6 mole O2 reacts with (1/2)*6 mole CH4
= 3 moles of CH4
But, there is only 1 mole CH4 provided. So CH4 is the limiting reagent.
Now,
According to Stoichiometry,
In the reaction,
1 mole CH4 produces 2 moles of H2O
Again,
According to Stoichiometry,
In the reaction,
1 mole CH4 produces 1 mole CO2
So, 1 mole of CO2 and 2 mole H2O will be produced in the reaction.
N:B:[Doing calculation with limiting reagent in problems like these gives you the most accurate answer].
please just help me.
Answer:
∆H= 3.92 kJ
∆S= 2.54 J
Explanation:
Hope It helps
If the [H+] in a solution is 1.0 x 10-7M, what is the [OH-] of this solution?
A. Higher than [H+]
B.lower than [H+]
C.same as [H+]
Answer:
C.same as [H+]
Explanation:
Autoionization of water is expressed as H+ * OH- = Kc
The value of Kc is 1*10^-14. Now simply plug thus in and the value of given H+ to solve
(1*10^-7) * OH- = 1*10^-14
OH- = 1*10^-7
Thus, in this scenario, the H+ and OH- ions have same concentration and solution is said to be neutral.
To test paint quality, scientists designed an experiment where the paint was exposed to temperatures ranging from 260 degrees Celsius to 650 degrees Celsius. After each trial, the paint quality was determined by checking for peeling and cracking. The same paint and materials were used in each trial.
Independent Variable-
dependent variable-
constant rate(s)
Answer:
The independent variable is the temperature to which the paint and materials are exposed
The dependent variable is the presence of peeling and cracking of the paint
The constant rates are the paint and material used for each trial
Explanation:
The treatment the to which the paint is subjected = Temperatures from 260 °C to 650 °C
The method of determining the paint quality = By peeling and cracking
The types of paint and materials used = The same paint and material
The independent variable is the variable suspected as the cause of the effect being studied. It is the variable introduced as a treatment
In the question, given that the paint is subjected to different temperatures from between 260°C to 650 °C, the temperature changes introduced is the independent variable
Therefore;
The independent variable = The temperature to which the paint and materials are exposed to
The dependent variable is the effect variable. It is the variable of the property being investigated and it is also the variable that is measured in the investigation
In the question, given that the after heating the paint and material, the scientist check for peeling and cracking, the dependent variable is the occurrence of cracking and peeling at a given temperature
Therefore;
The dependent variable = The presence of peeling and cracking of the paint
The constant rate(s) are variables which are kept constant during the investigation, under the different treatments
The constant rate(s) in the tests are the paint and material, which were kept the same for each trial to reduce the effect of underlying factors that may impact on the result and obscure the relationship between the dependent and independent variables
Therefore;
The constant rate are the paint and material used for each trial
What is the equation for determining gas pressure?
What is a single-displacement reaction?
a type of reaction that occurs when two simple substances interact to form a single new, more complex compound
a type of reaction that occurs when a single substance breaks down into two or more less complex substances
a chemical reaction that occurs when a substance combines with molecular oxygen, releasing light and heat
a chemical reaction that occurs when one element within a compound is exchanged with another element
Answer:
it's the last one.
Explanation:
a compound reaction that occurs when one element within a compound is exchanged with another element.
what is a major disadvantage of crude oil as an energy resource ?
Answer:
Burning oil can pollute the air. Much of our oil has to be imported and it is becoming more and more expensive as reserves reduce and imports increase. Producing electricity from crude oil is expensive compared to other fossil fuels such as coal or gas.
Explanation:
A pan containing 20 grams of water was allowed to cool from temperature of 95 degrees C. If the amount of heat released is 1200 joules, what is the approximate final temperature of the water
Answer:
81 °C
Explanation:
I don’t know, I just know :)
what is the answer of this Al2(SO3)3 + NaOH g Na2SO3 + Al(OH)3
Answer:
Al2(SO3)3 + 6NaOH → 3Na2SO3 + 2Al(OH)3
Which of the following describes an impact of the specific heat of water on the planet and the life forms that exist on it?
a) places near the sea show high high temp variation
b) inland cities have moderate temperatures throughout the year
c) marine life experiences sudden spikes and drops in temperature
d) sweat requires a lot of thermal energy to be absorbed to evaporate
Answer:
The answer is D, "sweat requires a lot of thermal energy to be absorbed to evaporate."
Explanation:
Like the other person, I just took the test.
An impact of the specific heat of water on the planet and the life forms in it is: D. sweat requires a lot of thermal energy to be absorbed to evaporate.
What is thermal energy?Thermal energy is also referred to as heat and it can be defined as a form of energy that is transferred from one physical object to another, especially due to a difference in temperature.
Generally, a lot of thermal energy is required to be absorbed for sweat to evaporate and this is mainly due to the impact of specific heat of water on the planet and all the life forms that are existing on it.
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The saturation point for a solution is 50.0 grams of solute per 500 grams of solvent. How many grams of solute can be dissolved in 800. grams of solvent?
Plz help me
Answer:
I think it can dissolve 80.0 grams
On the calendar provided below, the full moon is shown happening on the eleventh of the month? What moon would you see around the 25th of the month, shown with the question mark? Question 8 options: A. First Quarter B. New Moon C. Waxing Crescent D. Waning Gibbous
Answer:
The correct answer is - B. New Moon.
Explanation:
The change of moon disc from all black to all light to all dark again is called the lunar cycle. It takes almost 30 days (29.53059 to be precise). The time from all black to all light or all light to all black is almost 15 days. All black moon is termed as the new moon and all light is termed as the full moon.
As given that the full moon is shown happening on the eleventh of the month then what moon would be around 25 which is 14 days later that should be in waxing gibbous phase and almost new moon.
Thus, the correct answer is - B. new moon.
Oxidation, or the loss of electrons, will result in an element becoming _____ positive. This element will show a(n) _____ in oxidation number. Reduction, the gain of electrons, will cause an element to become _____ positive and the element will show a(n) _____ in oxidation number.
Answer:
1)more
2) increase
3)less
4)decrease
Explanation:
Oxidation can be regarded as process involving loss of electrons when a reaction is taking place by an atom or molecule, atom as well as ion. Oxidation do take place as when there is increase in oxidation state of a molecule as well as atom or ion. Reduction which is opposite process takes place as a result of gain in electrons, or when there is decrease in oxidation state of an atom as well as molecule, or ion. Oxidation number gives the the number which is been allocated to elements during a reaction of chemical combination. It gives the count of sharable electrons for an atoms or electron it can gain or loose as chemical bonding is taken place.
It should be noted Oxidation, or the loss of electrons, will result in an element becoming more positive. This element will show an increase in oxidation number. Reduction, the gain of electrons, will cause an element to become less positive and the element will show a decrease in oxidation number.
Which of these describes a similarity between nuclear energy and fossil fuel?
A. Both release products with short half-lives.
B. Both fuels have the same energy density.
C. As both fuels undergo reactions, heat is released, which is used to
do work.
D. The cost of storing both fuels is expensive.
SUBMIT
The similarity between nuclear energy and fossil fuel is "as both fuels undergo reactions, heat is released, which is used to do work."
What is nuclear energy?Nuclear energy is the type of power produced when a nuclear reaction releases energy. Nuclear energy was exemplified mostly by the electricity generated by just a nuclear reactor, which is Japan's principal source of energy.
What is fossil fuel?Fossil fuel is just a hydrocarbon-containing component that occurs naturally in the earth's crust and is collected and being used as a fuel. The most popular fossil fuels are coal, crude oil, and natural gas.
Therefore, similarity between nuclear energy and fossil fuel is both fuels undergo reactions, heat is released, which is used to do work.
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How many calories are absorbed in a process that absorbs 0.128 joules?
A. 0.031 cal
B. 0.536 cal
C. 536 cal
D. 0.310 cal
How many calories are absorbed in a process that absorbs 0.128 joules?
Answer:
There are 0.0305 calories in 0.128 joules
Explanation:
Given that,
Heat absorbed, Q = 0.128 J
We need to find the heat energy absorbed in calories.
We know that the relation between joules and calories is as follows :
1 calorie = 4.184 J
1 J = (1/4.184) J
So,
[tex]0.128\ J=\dfrac{0.128 }{4.184}\\\\=0.0305\ cal[/tex]
So, there are 0.0305 calories in 0.128 joules
Pls help need by tomorrow.
What were the manipulated, responding, and one controlled variable from Spallanzani's
experiment?
Answer:
Answer here!
Explanation:
One controlled variable can be that they used the same setup, that is the constant between the two experiments. The manipulation was that Spallanzani used a flask without any air and a flask with air. The responding was or the dependent variable was to notice what had changed so in the experiment Spallanzani noticed that the flask with no air led to no microorganisms meaning that the theory of spontaneous generation is false.
The manipulated variable was the presence or absence of air in the flask. The responding variable was the growth of microorganisms in the broth. The controlled variable was the composition of the broth.
In Spallanzani's experiment, the manipulated variable refers to the factor that the scientist deliberately changes or manipulates. In this case, it was the presence or absence of air in the flasks. One flask had air sealed inside with the broth, while the other flask had no air present.
The responding variable is the factor that is observed or measured in response to the manipulated variable. In this experiment, the growth of microorganisms in the broth was the responding variable. Spallanzani checked for the presence or absence of microorganism growth in each flask.
The controlled variable is the factor that is kept constant or controlled throughout the experiment to ensure that it does not influence the results. In this case, the controlled variable was the composition of the broth used in both flasks. The broth composition was consistent, ensuring that any differences observed in microorganism growth could be attributed to the presence or absence of air.
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How do scientists verify the results of an experiment?
by analyzing results
by communicating with other scientists
by collecting data
by repeating the experiment
Answer:
by repeating the experiment
Explanation:
sometimes repeating the experiment with multiple trials can help make the experiment worth it
when you hold a metal coat hanger in a camp fire to roast a marshmallow, the coat hanger might get too hot to hold. what type of heat transfer is occurring between the metal coat hanger and your hand? explain what is happening at the molecular level that causes your hand to feel hot.
Answer:
Heat transfer by conduction
Please help!!! If u reply with a link i will report
M = mRT/PV
Use the equation above to find the molar mass of a 98.2 g sample of gas that fills a 50.0 liter container at STP
a. 4.00 g/mol
b. 44.0 g/mol
c. 1.48 g/mol
d. 32.0 g/mol
At STP 101.3 kPa 0 C one mole of Ar gas was collected and was found to occupy a volume of 22.4L What is the value of the gas constant in rounded to the nearest hundredth?
Answer:
8.31 KPa.L/Kmol
Explanation:
From the question given above, the following data were obtained:
Pressure = 101.3 KPa
Temperature (T) = 0 °C = 273 K
Number of mole (n) = 1 mole
Volume = 22.4 L
Gas constant (R) =?
The gas constant can be obtained as follow:
PV = nRT
101.3 × 22.4 = 1 × R × 273
2269.12 = R × 273
Divide both side by 273
R = 2269.12 / 273
R = 8.31 KPa.L/Kmol
Therefore, the value of the gas constant is 8.31 KPa.L/Kmol
Can someone help me please
Answer:
I believe the answer is C.
Answer:
C
Explanation:
green house gases effects increases global warming
Given the formula of a compound:
(1) aldehyde
(2) alkene
(3) alkyne
(4) alcohol
Answer:
Number 3 alkyne is the answer
Explanation:
Answer: The answer is Alkyne.
Which phrase describes a volcano that is not expected to erupt again?
1 quiet volcano
2 extinct volcano
3 dormant volcano
4 explosive volcano
Answer:
Extinct
Explanation:
Extinct volcanos are not expected to erupt, and have not erupted in a very long time.
The H-O bonds in H20?
Answer:
Each water molecule can form two hydrogen bonds involving their hydrogen atoms plus two further hydrogen bonds utilizing the hydrogen atoms attached to neighboring water molecules.
Explanation:
Please answer questions as soon as possible. Will be picking the brainiest answer.
Answer:
1. One is more compact than the next hence more density
2. A: 0.67g/cm3 hence will sink
B:0.56g/cm3 hence will sink
C:0.91g/cm3 hence will sink
Explanation:
Use the formula mass/volume to find its density with S.I unit is g/cm3
And to determine weather or not it sink use the relative density formula
Density of substance / Density of water
How many moles of HCI would you have if you have 7 L of a 9M solution
of HCI? *
Explanation:
1kg x 0,37=370gHCL
370g/36,5g/mol=10,137mol/kg
1l=1,185kg
10,137 x 1,185kg/l =12,0mol/l
(x/ml(12mol HCL)*12mol/L)/100ml=0,025mol/L
x=
PLEASE HELP
If I put more air in a car tire, which relationship does it show?
a. pressure and volume
b. temperature and volume
c. amount of gas and pressure
Selected: d. temperature and pressure
Answer:
amount of gas and pressure
2. To make the correct volume of stock solution, which should you add first to a volumetric flask, the solid or water? Why?
Answer:
A stock or standard solution is a solution in which you accurately know its concentration. You can make stock solutions in the chemistry laboratory or buy from chemical manufacturers. Once you have a stock solution, you can prepare solutions of lower concentration by diluting the concentrated stock solution.
Explanation:
To make the correct volume of stock solution, we should add first solid to a volumetric flask.
What is stock solution?Stock solution is a standard solution in which exact concentration of solute is present in particular volume. It is mainly used in analytical chemistry during the titration process.
During the preparation of stock solution, we should first add solid in the volumetric flask and then little amount of water to dissolve the solid and then finally add water to the required volume. If we first add total volume and then add solid then dissolution of solid may increase volume.
Hence, first we add solid in the volumetric flask.
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