In general, solids become more soluble as the temperature increases. This is why sugar dissolves better in hot water than in cold water. The table shows three examples of the solubility (g of solute per 100 g water) of substances at different temperatures.
that's my answer-0)
2H2(g) + O2(9) - 2H20(9)
How many liters of Hy are required to form 5 moles of H20 at STP?
)
A)
)
11.2 liters
B)
22.4 liters
44.8 liters
D
112 liters
Now
At STP any gas weighs 22.4L
Volume of H_2
22.4+(5)112Lwhat is the law of Conservation of mass ?
Which reactions are spontaneous? i. c2h5oh(l) 3o2(g) right arrow. 2co2(g) 3h2o(l), delta.g = –36.7 kj ii. 2c6h6(l) 15o2(g) right arrow. 12co2(g) 6h2o(l), delta.g = –6,405 kj iii. caco3(s) right arrow. cao(s) co2(g), delta.g = 13.0 kj iv. ni(s) cl2(g) right arrow. nicl2(s), delta.g = 1,130.28 kj i and ii iii and iv i and iii ii and iv
Reactions I and II are spontaneous reactions since they have negative delta G values.
What are spontaneous reactions?Spontaneous reactions are reactions which proceed towards formation of products without addition of heat energy from the surroundings.
Spontaneous reactions have negative free energy change values (Delta G is negative) since the formation of products results in increase in entropy of the system.
Therefore, the spontaneous reactions are I and II because their delta G values are negative.
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Answer: A (I and II
Explanation:
V. What volume of nitric oxide will diffuse out of a porous partition in 10 seconds when 25 ml of methane diffuse out in 4 seconds?
The volume of nitric oxide that will diffuse out of the partition in 10 seconds when methane diffuses is 62.5 mL
What is rate of diffusion?This is defined as the amount diffused per unit time. Mathematically, it can be expressed as
Rate = volume / time
How to determine the rate of diffusion of methaneVolume of methane = 25 mLTime = 4 sRate = ?Rate = volume / time
Rate = 25 / 4
Rate = 6.25 mL/s
How to determine volume of nitric oxideTime = 10 sRate = 6.25 mL/sVolume of nitric oxide = ?Rate = volume / time
6.25 = volume of nitric oxide / 10
Cross multiply
Volume of nitric oxide = 6.25 × 10
Volume of nitric oxide = 62.5 mL
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Evaluate which factor is most likely to cause the concentration of greenhouse gases in the earth's atmosphere to increase?
A.
decreased number of decomposing plants
B.
decreased number of volcanic eruptions
C.
increased frequency of earthquakes
D.
increased human industrial activities
Answer:
D. increased human industrial activities
Which is the balanced equation for v2o5 cas → cao v2s5? v2o5 cas → cao v2s5 5v2o5 5cas → 10cao 5v2s5 3v2o5 3cas → 3cao 3v2s5 v2o5 5cas → 5cao v2s5
We have the balanced reaction equation as; V2O5 + 5CaS → 5CaO + V2S5.
What is a balanced reaction equation?A balanced reaction equation is one in which the number atoms atoms on the reactant side is the same as the number of atoms on the products side.
In that case, we have the balanced reaction equation as; V2O5 + 5CaS → 5CaO + V2S5.
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Answer:
d
Explanation:
got 100
What is the molarity of a solution that has 90 mol of solute dissolved in 6 liters of solvent? ___ M
Answer:
15M
Explanation:
To find molarity, you use the equation :
Molarity = [tex]\frac{moles of solute}{liters of a solution}[/tex]
So to find the molarity, you would do 90mols of the solute divided by 6 liters of the solvent which is 15M.
An aluminum aerosol can will burst if the pressure inside reaches 210.0 psi. if the can initially contains an ideal gas at 459.5 kpa at 298.15 k, at what temperature (in k) will the can burst?
The can will burst at 938.45 K.
What is Gay Lussac's Law ?Gay Lussac's Law states that the pressure of a fixed amount of gas is directly proportional to the absolute temperature at constant volume.
i.e. P ∝ T
P= KT
P₁ = KT₁
P₂ = KT₂
Here we have considered that the gas is at two different temperatures and pressures which is denoted by T₁ , T₂ and P₁ , P₂
It can also be written as
(P₁ /P₂ ) = (T₁ / T₂)
It is given that
P₂ = 14.29 atm
P₁ = 4.535 atm
T₁ = 298.15 K
T₂ = ?
T₂ = (298.15 * 14.29 )/ 4.54
T₂ = 938.45 K
Therefore the can will burst at 938.45 K.
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The lewis dot structure rule states that
s=n-a.
recall that s represents the.total
number of valence electrons needed for
all the atoms in a molecule to achieve an
octet.
what is s for silicon tetrachloride, sic14?
Answer:
32
Explanation:
The total valence electron is available for the Silicon tetrachloride
lewis structure is 32
What kind of radioactive element is useful for dating an object?
a. one with a half-life close to the age of the object
b. one that is present in very small amounts
c. one that decays very quickly into a stable form
d. one that does not undergo transmutation
The kind of radioactive element is useful for dating an object is one with a half-life close to the age of the object.
What are radioactive elements?Radioactive elements are elements that involved in radioactivity and this comprises of atoms or particles in their nuclei whose atomic nuclei are not stable and they emit radiations to maintain stability.
Therefore, The kind of radioactive element is useful for dating an object is one with a half-life close to the age of the object.
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How many moles of oxygen are required to make 4 moles of water?
Answer:
2 moles of oxygen
Explanation:
Basic Equation (given) :
2H₂ (g) + O₂ ⇒ 2H₂O (g)
From this, we understand for every 2 moles of water, 1 mole of oxygen is neededTaking the number of moles of oxygen and water in proportion :
1 : 21 × 2 : 2 × 22 : 4Therefore, 2 moles of oxygen are required to make 4 moles of water.
[tex] \textsf{\qquad\qquad\huge\underline{{\sf Answer}}} [/tex]
As per the given equation, we can infer that :
For getting 2 moles mole of water, 1 mole of oxygen gas was required. so to get 4 moles of water we need :
We just have to multiply the whole reaction by 2 on both sides, in order to get 4 moles of H2O on product side.
[tex] \qquad \qquad \rm4 \: H_2 + 2 \: O_2 \rightarrow4 \: H_2O[/tex]
therefore, we need
[tex]\qquad \sf \dashrightarrow \: 2 \times 1 = 2 \: moles \: \: oxygen \: gas[/tex]
A copper foil is made from copper, absolutely free of impurities. Which term or terms could be used to describe this sample of copper
Answer:
Explanation:
pure chemical substances and element.
All elements are pure. If this sample of copper had been impure, we would call it a mixture, not an element.
A balloon containing 0.15mol of hydrogen gas (H2) has a volume of 0.75L. If the balloon is further inflated with additional hydrogen gas to a 3.75L volume, what is the total mass of hydrogen gas in grams in the balloon
The total mass of hydrogen gas in grams in the balloon given the data is 1.5 g
How to determine the new mole of hydrogenInitial mole (n₁) = 0.15 moleInitial volume (V₁) = 0.75 LNew volume (V₂) = 3.75 LNew mole (n₂) = ?The new mole of the gas can be obtained by using the ideal gas equation as follow:
PV = nRT
V / n = RT / P
RT / P = constant
V₁ / n₁ = V₂ / n₂
0.75 / 0.15 = 3.75 / n₂
5 = 3.75 / n₂
Cross multiply
5 × n₂ = 3.75
Divide both sides by 5
n₂ = 3.75 / 5
n₂ = 0.75 mole
How to determine the mass of hydrogenNumber of mole = 0.75 moleMolar mass of H₂ = 2 g/moleMass of H₂ = ?Mass = mole × molar mass
Mass of H₂ = 0.75 × 2
Mass of H₂ = 1.5 g
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what is the percent yield
the percent yield: 9/21 x 100% = 42.9%
An unknown substance weighing 50.0g was heated from 36.0 to 69.0. In this process, the substance absorbed 5890.0J of energy. What is the specific heat of the substance
How many grams of iron are in 3.2 moles of iron
Answer:
17.03052
Explanation:
thats the answer i got hope this helps at all
A way of describing a chemical change that indicates what substances were present before the change and what substances are present after the change is called a _____.
A. chemical equation
B. chemical formula
C. chemical bond
D. All of the above
E. None of the above
Answer:
[tex]\\ \rm\dashrightarrow Chemical\: Equation [/tex]
Explanation:
When a chemical change happens or chemical reaction happens something yields at reactants and something at products
Representing them is called chemical equation
HELP ASAP PLEASE!!!!!!!Which statements describe what happens in a redox reaction? Check all that apply. A. One substance gains electrons and one substance loses electrons. B. Electrons are moved between two substances. C. There are two reduction reactions. D. The anions on two compounds trade places
Electrons are moved between two substances.
how many moles of O2 will react with 0.6482 moles of H2O?
2C3H6O + 5O2 → 6CO + 6H2O
Answer:
n=0.648 moles
the ratio 5:6
x:0.648
x=0.54 moles
what type of rock is the Wave made of?
What type of rock is the wave made of?
Answer: The Wave is a natural formation of ~sandstone rocks~
In an ionic bond, metals lose electrons to become _____.
Answer:
In an ionic bond, metals lose electrons to become Cations.
Explanation:
Metal atoms lose electrons to form positive ions (cations).
Many factors would bring advantages when using fuel cells in cars, but which factor presents a drawback? fuel consumption hydrogen storage greenhouse gas emissions reliance on petroleum products
One potential drawback of using fuels cells in cars is that it require large tanks for hydrogen storage.
What are fuels cells?Fuel cells are cells which use hydrogen and oxygen as fuel to produce electrical energy for use in various purposes such as in powering cars.
The energy produced is as a result of redox reactions.
Fuels cells are clean renewable energy sources.
A potential drawback of using fuels cells in cars is that it require large tanks for hydrogen storage.
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what is the atomic number of sodium
The atomic number of sodium atom (Na) is 11.
What is atomic number?Atomic number of any atom is denoted by the symbol Z, and it is equal to the number of protons or electrons present in that atom.
In the sodium atom, number of proton is equal to 11 and number of electrons is also equal to 11. So the atomic number of sodium atom is 11.
Hence atomic number of sodium is 11.
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The atomic number of sodium is 11.
1. The atomic number of an element represents the number of protons in the nucleus of its atom.
2. Sodium is an element with the symbol Na, and its atomic number can be found on the periodic table.
3. Locate sodium (Na) on the periodic table. It is in the third period and belongs to Group 1, also known as the alkali metals.
4. The atomic number is usually displayed above or below the element's symbol. In the case of sodium, the atomic number is 11.
5. Therefore, the atomic number of sodium is 11. It means that a neutral sodium atom has 11 protons in its nucleus.
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Calculate the pressure (in kpa) of 1.5 mole of helium gas at 354 k when it occupies a volume of 16.5l.
Answer:
267.57 kPa
Explanation:
Ideal gas law:
PV = n RT R = 8.314462 L-kPa/K-mol
P (16.5) = 1.5 (8.314462)(354) P = 267.57 kPa
Which pair of molecules has hydrogen bonding interactions?.
Answer:
Hydrogen bonding is a special type of dipole-dipole interaction that occurs between the lone pair of a highly electronegative atom (typically N, O, or F) and the hydrogen atom in a N–H, O–H, or F–H bond.
The concentration of reactants and products and the rate of reaction were measured during a chemical reaction. After the first 3 seconds, the rate of reaction was 1.8 x10−6 M/s. Which of the following would explain a lower rate after another 3 seconds?
The concentration of reactants increased while the concentration of product decreased.
The concentration of reactants decreased while the concentration of product increased.
All concentrations of reactants and products decreased.
All concentrations of reactants and products increased.
Lower rate after another 3 seconds of the given rate is concentration of reactants increased while the concentration of product decreased.
What is the rate of reaction?Rate of the reaction gives idea about the speed of the completion of the reaction or the formation of product.
Given rate of reaction = 1.8×10⁻⁶ m/sec
After 3 seconds rate of the reaction decreases, which means speed of the formation of product decreases as a result of which:
Concentration of product decreases.Concentration of reactant increases.Hence, concentration of reactants increased while the concentration of product decreased.
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Answer:
B. The concentration of reactants decreased while the concentration of product increased.
Explanation:
i took the test
Which type of fossil can be described as dead wood that has turned into stone?
a. cast fossil
b. sedimentary fossil
c. petrified
d. mold fossil
Answer:
The answer is c hope it is right if it is rong please tell me tho :)
a 125.0 mg sample of an unknown, monoprotic acid was dissolved in 100.0 ml of distilled water and titrated with a 0.050 m solution of naoh. the ph of the solution was monitored throughout the titration, and the data were collected. determine the ka of the acid and identify the unknown acid.
data-
volume of oh- added (ml), ph:
0, 3.09
5, 3.65
10, 4.10
15, 4.50
17, 4.55
18, 4.71
19, 4.94
20, 5.11
21, 5.37
22, 5.93
22.2, 6.24
22.6, 9.91
22.8, 10.2
23, 10.4
Answer:
33,666
Explanation:
is the dictionary definition of a word.
is the feeling or idea associated with a word.
How many grams of NH4NO3 are required to produce 4.29 g of N2O?
Answer:
To produce 1 mole of N2O required 1 mole of NH4NO3 . Hence, 60 grams of NH4NO3 are required to produce 33.0 g N2O
Explanation:
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The energy that must be added to a system to break the bonds of the
reactants is known as _____?
potential energy
kinetic energy
thermal energy
activation energy
Answer:
activation energy
Explanation:
it is activation energy becauseThe activation energy for the forward reaction is the amount of
free energy that must be added to go from the energy level of the
reactants to the energy level of the transition state