Answer:
Fractional Distillation could be used to:
Obtain the different fractions of a crude which may have more uses and be more useful.Obtain ethanol from a mixture of ethanol and water.Fractional Distillation is used to obtain one substance from a mixture. It depends on the boiling points of the substances.
A 216-L cylinder holds propane gas at 184.8 kPa of pressure and 127°C. How many moles of propane are in the cylinder?
Answer:
12 moles of propane.
Explanation:
From the question given above, the following data were obtained:
Volume (V) = 216 L
Pressure (P) = 184.8 KPa
Temperature (T) = 127 °C
Number of mole (n) =?
Next, we shall convert 127 °C to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
T(°C) = 127 °C
T(K) = 127 + 273
T(K) = 400 K
Finally, we shall determine the number of mole of propane gas in the container. This can be obtained as follow:
Volume (V) = 216 L
Pressure (P) = 184.8 KPa
Temperature (T) = 400 K
Gas constant (R) = 8.314 L.KPa/Kmol
Number of mole (n) =?
PV = nRT
184.8 × 216 = n × 8.314 × 400
39916.8 = n × 3325.6
Divide both side by 3325.6
n = 39916.8 / 3325.6
n = 12 moles
Thus, 12 moles of propane is present in the cylinder
When a precipitation reaction occurs the resulting mixture of liquid solution and solid precipitate would be considered a___________ Mixture.
When a precipitation reaction occurs the resulting mixture of liquid solution and solid precipitate would be considered a heterogeneous Mixture.
What is precipitation reaction?Chemical reactions known as precipitation reactions take place in aqueous solutions to produce precipitates. Moreover, chemical changes that occur inside the substances are a part of chemical processes.
Moreover, chemical reactions take place between two or even more chemical substances, known as reactants. As a result, the reactants might be solid, gaseous, or liquid in nature. When a precipitation reaction occurs the resulting mixture of liquid solution and solid precipitate would be considered a heterogeneous Mixture.
Therefore, when a precipitation reaction occurs the resulting mixture of liquid solution and solid precipitate would be considered a heterogeneous Mixture.
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Question 1
Balance the following chemical equation. __Li+___f2-->___LIF
Answer:
2Li + F2 → 2LiF
Explanation:
Hope this helps!
What is the IUPAC name for H2O?
Answer:
I guess it is.....
Oxidane.
Answer:
Technically, dihydrogen monoxide.
Explanation:
You see, the International Union of Pure and Applied Chemistry, also known as IUPAC, hasn't seen a need to define a structural name for water yet.
Following the naming conventions, it should most likely be called "dihydrogen monoxide", but IUPAC has never officially defined this as the chemical name for water.
what's the advantage and disadvantage of How does the number of "carbon" atoms in different alcohol affect the energy density of alcohol ( like Pentanol, butanol, propanol and methanol?
WILL GIVE BRAINLESS IF ALL ANSWER ARE CORRECT
Which of these is not a limiting factor for a population of squirrels?
a
Available space to build nests
b
Available water sources
c
Available friends to play
d
Available food to eat
Question 2 (4 points)
A decrease in limiting factors leads to an increase of biodiversity.
True
False
Question 3 (4 points)
If a disease destroying soybean plants in a field completely sweeps through an ecosystem, what would happen to the population of
songbirds that rely on the soybeans for food?
a
The songbird population would decrease
b
The songbird population will remain constant
c
The songbird population will increase rapidly
d
The songbirds will all crumple to the ground instantaneously
Question 4 (4 points)
Which of these limiting factors from the lesson is abiotic?
a
Predators
b
Food
c
Weather
d
Diseases
Question 5 (4 points)
Which of the following was given in the lesson as a limiting factor for organisms in the Caribbean Sea?
a
Amount of rainfall
b
Nesting locations
c
Water Temperatures
d
A lack of space within the mangrove swamps
Question 6 (5 points)
Are limiting factors positive, negative, or both for an ecosystem? Explain your reasoning
Question 7 (4 points)
When a population grows past the ecosystem's carrying capacity, what happens to the population?
a)It continues to grow
b)the population starts to die off to return to carrying capacity
c)The population will go extinct due to lack of resources
d)The population grows, then finds a new carrying capacity
Question 9 (4 points)
Will competition increase or decrease the carrying capacity of an ecosystem for the animals in competition?
increase
Decrease
Question 10 (4 points)
The largest number of individuals in a species that an environment can support long term...
a)Immigration
b)population Density
c)Emigration
d)Carrying Capacity
Answer:
See explanation
Explanation:
1) C
2) True
3) A
4) C
5) A
6) Both. Some species that rely on the limiting factors will be harmed and other species that are prey to those species relying on limiting factors will be benefited.
7) B
9) Decrease
10) D
What is the relationship between mole, Avogadro number and mass?
a.1mole=6.022 × 1023 atoms and molecules= g atomic/molecular mass
b. 1mole =6.022 × 1023 atoms and molecules /1 g atomic/molecular mass
c. 2mole=6.022 × 1023 atoms and molecules=1 g atomic/molecular mass
d. 1mole < 6.022 × 1023 atoms and molecules=1 g atomic/molecular mass
Answer:
The mass of one mole of a substance is equal to that substance's molecular weight. ... water is 18.015 atomic mass units (amu), so one mole of water weight 18.015 grams. ... Avogadro's number is a proportion that relates molar mass on an atomic ... one molecule of water (H2O), one mole of oxygen (6.022×1023 of O atoms)
Is the equation for reaction 1 balanced? Explain your reasoning. If the reaction is not balanced, then state how you would balance it. Then, provide the balanced equation.
Answer:
Reaction is already balanced
Explanation:
The equation in reaction 1 is given as;
CH3COOH + NaHCO3 --> CO2 + H2O + Na+ + CH3COO-
The reaction is already balanced. This is because the umber of atoms of elements in the reactant is equal to that of the products
Carbon
Reactant = 2 + 1 = 3
Product = 2 + 2 = 3
Hydrogen
Reactant = 3 + 1 + 1 = 5
Product = 2 + 3 = 5
Oxygen
Reactant = 2 + 3 = 5
Product = 2 +1 + 2 = 5
Sodium
Reactant = 1
Product = 1
Answer:
The reaction is already balanced because the number of atoms in the reactant is equal to the products
Explanation:
why do scientist think the earths core have iron in it .
light behaves as a longitudinal wave
Answer:
No, light behaves as a Transverse Wave. All electromagnetic waves behave as transverse waves.
hii if you answer this i’ll give you brainlist
Answer: 24.0g of NaCl.
The number seems the highest, but I am not in Honors Chem (I am taking honors biology), so I do not know.
Two plants growing close to one another are competing for resources. Which resource are they NOT likely to compete for? Choices A-Water B-Soil and nutrients C- Carbon dixoide
Answer: the resource which they are not likely to compete for is CARBONDIOXIDE. The correct option is C.
Explanation:
Competition may be defined as the a negative effect on plant growth which occurs when there is reduction in the availability of resources.
During the growth of plants, there are several resources that affects it's growth and maintenance. These resources include:
--> soil nutrients,
--> water,
--> carbondioxide and
--> sunlight
Since plants are autotrophs, that is, they manufacture their own food through the use of inorganic raw materials such as water and carbondioxide in the presence of sunlight, there may exist some level of competition for these resources when there is lack of space.
But plants are NOT likely to compete for carbondioxide because the atmospheric pool of carbondioxide is large and well mixed, therefore it won't be affected by lack of space between the two plants. Unlike the other main resources such as soil nutrients and water which are highly competed for and can determine the distribution of plants in an ecosystem.
FREE BRAINLIST NEED HELP ASAP
A student runs 100 meters in 16 seconds. What is the speed of the student?
Answer:
6.25m/s
Explanation:
speed = distance/time
speed = 100/16 = 6.25m/s
how does the compound NaOH contain ionic and covalent bonds?
Answer:
Explanation:
OH forms a covalent bond. However, OH itself is negatively charged. Therefore, it can form ionic attractions to the positively charged sodium (Na+) ions.
Which statement is correct about the law of conservation of energy?
Energy is created when water freezes.
Energy is destroyed when sugar is burned.
Energy stays inside molecules permanently.
Energy is transferred when atoms are rearranged.
Answer:
Energy is transferred when atoms are rearranged
Explanation:
Breaking bonds between atoms need energy. When new bonds are formed, energy is released
The law of conservation of energy is energy isn't created or destroyed
A and B are wrong because there is creation or destruction of energy
C is wrong because energy can be transferred (think touching a hot stove with your finger. heat is transferred from the stove to your finger OUCH!)
D is correct because the energy is still there, but in a different form
(16m)(x)=(0.10)(1.5l)
Answer:
0.192 M NaOH
Explanation:
Ozone, O3, is produced in automobile exhaust by the reaction represented by the equation:
NO2 (g) + O2 (g) → NO (g) + O3 (g)
What mass of ozone is predicted to form from the reaction of 5.0 g NO2 in a car’s exhaust and excess oxygen?
Answer: 5.28 g of [tex]O_3[/tex] is produced.
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} NO_2=\frac{5.0g}{46g/mol}=0.11moles[/tex]
The balanced chemical reaction is:
[tex]NO_2(g)+O_2(g)\rightarrow NO(g)+O_3(g)[/tex]
[tex]NO_2[/tex] is the limiting reagent as it limits the formation of product and [tex]O_2[/tex] is the excess reagent.
According to stoichiometry :
1 mole of [tex]NO_2[/tex] produces = 1 mole of [tex]O_3[/tex]
Thus 0.11 moles of [tex]NO_2[/tex] will produce=[tex]\frac{1}{1}\times 0.11=0.11moles[/tex] of [tex]O_3[/tex]
Mass of [tex]O_3=moles\times {\text {Molar mass}}=0.11moles\times 48g/mol=5.28g[/tex]
Thus 5.28 g of [tex]O_3[/tex] is produced.
According to the Law of Conservation of Mass, how much water is produced if 22.5 g of
CHA react with 35.7g of Oz to form 48.9g of CO2?
CH4 + O2 + CO2 + H2O
o 107.1g
o 71.4g
o 62.1g
o 9.3g
8
9
10 11
12 13 14 15 16 17
Ne
Answer: The amount of water produced is 9.3 grams
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
[tex]CH_4+2O_2\rightarrow CO_2+2H_2O[/tex]
mass of reactants = mass of methane + mass of oxygen = 22.5 g + 35.7 g = 58.2 g
mass of products = mass of carbon dioxide + mass of water = 48.9 g + mass of water
48.9 g + mass of water = 58.2 g
mass of water = 9.3 g
4) How much of the world population lives in countries where there isn't enough water, or
the quality has been compromised?
Answer:
The answer is 1/3 of the population.
Which statement describes the reaction involved in cellular respiration?
A. Sugar is produced and stored until it is needed for energy.
B. CO2 is removed from the atmosphere, and O2 is released into the
atmosphere.
C. It is a redox reaction in which energy is released to ATP molecules.
D. O2 is removed from the atmosphere, and CO2 is released into the
atmosphere.
Answer:
C
Explanation:
Cellular respiration is the metabolic process and is a reduction-oxidation reaction that yields ATP molecules. Thus, option C is accurate.
What is cellular respiration?It is a redox reaction that utilizes glucose and oxygen molecules to release carbon dioxide and energy in the form of ATP. This energy released is used to drive the functions and roles of the cells.
The food molecule, glucose is broken in the presence of the oxygen molecule to release the carbon dioxide and the energy from the cells that are in the form of adenosine triphosphate molecule.
Therefore, option C. cellular respiration is a redox reaction is correct.
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2. Describe two ways in which you could decide when an
acid has been completely neutralised by an insoluble
carbonate.
Answer:
search in chrome u will get your answer
Explanation:
A student investigates a pure metal, X . The student takes a 100.0 g piece of metal X , heats it to 500.0°C , then places it on a 1000.0 g block of ice at 0.0°C . The ice partially melts, and the final temperature of the metal, ice, and melted water is 0.0°C . The student calculates the experimental value of the specific heat capacity of metal X and records it as 0.24 J/(g⋅°C) . Calculate the magnitude of the energy change (qmetal) of metal X during the experiment.
Answer:
q_metal = -12000 J = -12 KJ
Here, the negative sign indicates that the energy is lost by the metal piece.
Explanation:
The magnitude of energy change of the metal X can be given by the following formula:
[tex]q_{metal} = mC\Delta T[/tex]
where,
m = mass of metal = 100 g
C = Specific Heat Capacity of metal X = 0.24 J/g.°C
ΔT = Change in Temperature of Metal Piece = 0° C - 500°C = -500°C
Therefore, using these values in the equation, we get:
[tex]q_{metal} = (100\ g)(0.24\ J/g^oC)(-500^oC)\\[/tex]
q_metal = -12000 J = -12 KJ
Here, the negative sign indicates that the energy is lost by the metal piece.
An 8.5 g. Of ethanol (C2H5OH) placed in a constant volume calorimeter and the temperature rose to 3.2°C. Find the heat of reaction of the ethanol (MM =46.1 g/mol) in kJ/mol. The heat capacity of the calorimeter plus water is read as 6.38 J/°C
Answer:
[tex]\Delta H_{rxn}=-0.111 \frac{kJ}{mol}[/tex]
Explanation:
Hello!
In this case, since the total heat flow due to the reaction equals the negative of the calorimeter's heat, we can first compute the former as shown below:
[tex]Q_{rxn}=-C\Delta T\\\\Q_{rxn}=6.38\frac{J}{\°C}*3.2\°C=-20.416J[/tex]
Now, since this total heat flow due to the reaction is defined in terms of the heat of reaction and the total reacted moles:
[tex]Q_{rxn}=n*\Delta H_{rxn}[/tex]
Thus, we compute the moles in 8.5 g of ethanol:
[tex]n=8.5g*\frac{1mol}{46.08g}=0.185mol[/tex]
Therefore, the heat of reaction results:
[tex]\Delta H_{rxn}=\frac{Q_{rxn}}{n} =\frac{-20.416J}{0.185mol} =-110.7J/mol\\\\\Delta H_{rxn}=-0.111 \frac{kJ}{mol}[/tex]
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i really need help:/ my friend is helping and nobody understands it
Answer:
A= Compound
B= Mixture
C= Element
D= Element
Explanation:
A has two different types of atoms chemically together as a compound
B is made up of two or more different atoms not chemically joined together
C has one type of atom
D has one type of molecule. They're the same and could be a diatomic element like hydrogen
Sorry if this is confusing or wrong
Why are ions created in an ionic bond?
_Na2B407 + _H2SO4(aq) +
H2SO4(aq) + -_H200 → __H3BO3(s) + __Na2SO4(aq)
Balance the Equation
Answer:
Na2B4O7 + H2SO4 + 5H2O → 4H3BO3 + Na2SO4
Explanation:
The unbalanced equation is given as;
Na2B4O7 + H2SO4(aq) + H2O → H3BO3(s) + Na2SO4(aq)
Balancing the equation of the reaction involves making sure the number of moles of elements in the reactants to be equal to the number of moles of the element of the products.
The balanced equation is given as;
Na2B4O7 + H2SO4 + 5H2O → 4H3BO3 + Na2SO4
PLZZZ HELP BRAINILEST (science)
Answer:
i cannot see the question due to the flash you used
Explanation:
Please Help. Thank You!
Please help me guys.