From the stoichiometry of the combustion reaction, we can see that 7.4 L of oxygen is consumed.
What is combustion?Combustion is a reaction in which a substance is burnt in oxygen. The equation of the reaction is; C4H10O(l) + 6O2 (g) → 4CO2 (g) + 5H2O(l)
We can obtain the number of moles of CO2 from;
PV = nRT
n = 1.02 atm * 7.15 L/0.082 atm LK-1mol-1 * (125 + 273) K
n = 7.29 /32.6
n = 0.22 moles
If 6 moles of oxygen produces 4 moles of CO2
x moles of oxygen produces 0.22 moles of CO2
x = 0.33 moles
1 mole of oxygen occupies 22.4 L
0.33 moles of oxygen occupies 0.33 moles * 22.4 L/ 1 mole
= 7.4 L of oxygen
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the volume of gas collected when the temperature is 11.0c and the pressure is710.mmHg measures 0.148L. what is the calculated volume of the gas (in mL) at 20.0c and 740.mmHg?
Answer:
The calculated volume of the gas (in mL) at 20.0c and 740.mmHg when volume of gas collected at temperature of 11.0° C and pressure of 710 mmHg measures 0.148L is 78. 1 mL
Explanation:
The combined gas law combines the three gas laws, Boyle's law, Charles's law and Gay- Lussac's law. It states that the ratio of the product of pressure and volume and the absolute temperature of a gas is equal to a constant.
P V ÷ T = K
P1 × V1 ÷ T1 = P2× V2 ÷ T2
Parameters :
P1 = Initial pressure = 710.0 mmHg
V1 = 0. 148 L , converting it to mL = 0.148L × 1000 = 148 mL
T1 = Initial temperature = 11° C
P2 = Final pressure = 740 mmHg
V2 = Final volume in mL
T2 = Final temperature = 20° C
Calculations:
V2 = P1 × V1 × T2 ÷ P2 × T1
V2 = 710 × 148 × 11 ÷ 740 × 20
V2 = 1155880 ÷ 14800
V2 = 78.1 mL
Therefore, the calculated volume is 78.1 mL
HELP PLEASE ASAP WILL MARK BRAINLIEST
what is the amount of heat required to raise the temperature of 200.0g of aluminum by 10C (specific heat of aluminum: 0.21 cal/g C)
a. 420 cal
b. 4200 cal
c. 42,000 cal
d. 420,000 cal
Please show calculations!
Now
[tex]\\ \rm\Rrightarrow Q=mc\delta T[/tex]
[tex]\\ \rm\Rrightarrow Q=200(10)(0.21)[/tex]
[tex]\\ \rm\Rrightarrow Q=20(21)[/tex]
[tex]\\ \rm\Rrightarrow Q=420cal[/tex]
Answer:
AAAAA its A
Explanation:
At which temperature does water have particles with a greater average kinetic energy than water with a temperature of 30°C?
77°F
95°F
280K
300K
Answer:
95F
Explanation:
First we convert these temperatures into °C:
77°F = 25°C
95°F = 35°C
280K = 6.85°C
300K = 26.85°C
When temperature increases, water molecules have a greater average kinetic energy ans are more likely to collide with each other.
Out of the 4 temperatures, only 95°F (35°C) is of a higher temperature than 30°C. Hence 95°F is the answer.
Which term is testable, a prediction, and can be supported or refuted by data?
3 Apply Many scientific words, such as matter, also have everyday meanings. Use context clues to write your own definition for each meaning of the word matter.
Example sentence
What is this gooey matter on the table?
Matter:
__________
Example sentence
Please vote! Your opinions matter.
Matter:
__________
Answer:
Explanation:
Use context clues to write your own definition for each meaning of the word matter.
Example sentence
What is this gooey matter on the table?
Matter:
__________
Example sentence
Please vote! Your opinions matter.
Matter:
__________
2. What is evolution?
Explanation:
Evolution is a biological process. It is how living things change over time and how new species develop.
Answer: It’s B
Explanation:
Reduction is a reaction that uses________to change a molecule into something else.
Answer:
chemical reaction
Explanation:
Reduction is the transfer of electrons between species in a chemical reaction where there is a process of gaining electrons or a decrease in the oxidation state by an element. A reduction chemical reaction involves increasing electrons associated with a single atom or a group of atom
Part D
Based on your research, which source of energy do you think best meets the needs of society? Defend your answer in 50 to 100 words.
Energy is the fundamental need for lives. Fossil fuel is the energy source that is most needed in society. It is now replaced with solar energy as fossil fuels are nonrenewable resources.
What is the non-renewable and renewable source?Nonrenewable resources are energy sources that are finite in amount and get depleted after some time as it takes millions of years to produce these resources. Fossil fuels though are needed but are nonrenewable and cause pollution.
Solar energy is a renewable source that is present in abundant and infinite quantity and does not get depleted fast after they are used excessively. They are also environmentally friendly and do not produces much pollution.
Therefore, fossil fuel and solar energy are the most demanded sources.
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Which of the following elements is often used as a reactant in a nuclear fission reactor?
A. Hydrogen
B. Uranium
C. Carbon
D. Boron
Answer:
B
Explanation:
Uranium is windly use to reactant.
A drinking glass and a tightly sealed jar sit on the kitchen counter. both are half-filled with water and are undisturbed for several hours. will the liquid and water vapor establish equilibrium in either container? explain your answer
A tightly sealed jar will form liquid and water equilibrium but the drinking glass will not.
Will the liquid and water vapor establish equilibrium in either container?The liquid and water vapor establish equilibrium in a tightly sealed container but not in the drinking glass because in the tightly sealed jar, the water can't go into the atmosphere but in the drinking glass the water will evaporate.
So we can conclude that a tightly sealed jar will form liquid and water equilibrium but the drinking glass will not.
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What is a network solid?
a
A. A crystalline solid held together by intermolecular forces
B. A crystalline solid held together by charge attractions
C. A crystalline solid held together by metallic bonds
O D. A crystalline solid held together by covalent bonds
SUBMIT
Network solids are chemical compounds that are bound together by a covalent bond. Thus, option D is accurate.
What are covalent bonds?Covalent bonds are the type of chemical bonds that mutually shares electrons between the atoms of the molecules of the compound.
A covalent crystal of network solids is held together by the covalent bond that can be seen in the structures of diamonds, graphite, silicon dioxide, etc.
Therefore, the network solids are option D. held by the covalent bonds.
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Explain why a solution of calcium conducts electricity but solid calcium chloride does not
Answer:
because the ions arent firmly held in place!
Explanation:
part 1: name the type of chemical reaction that occurs when calcium hydroxide (ca(oh)2) reacts with
nitric acid (hno3).
part 2: explain why zinc (zn) would react with lead nitrate (pb(no3)2) but not with calcium chloride
(cacl2).
The type of reaction that occurs between calcium hydroxide and nitric acid is a neutralization reaction.
What is a neutralization reaction?The term neutralization reaction refers to a reaction that occurs between an acid and a base that leas to the formation of salt and water only. The type of reaction that occurs between calcium hydroxide and nitric acid is a neutralization reaction.
The reason why zinc will react with lead nitrate and not calcium chloride is because lead is less than zinc in the electrochemical series hence it can be displaced from solution.
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A sealed container of N2 gas has a pressure of 836 kPa at 54.7 ∘ C. After it is left out in the sun the pressure increases by 79.9 kPa. What is the new temperature of the container?
** BRAINLIEST!! **
How does pH of acids compare to pH of water?
pH of acids are higher than the pH of water.
pH of acids are lower than the pH of water.
Answer:
see below
Explanation:
water pH ~ 7 acids are less than 7 bases are > 7
A few drops of food coloring are put into two containers of water. Observations are shown in the table. Which statement best explains the observations in the table? A) The temperature of sample 1 is higher than the temperature of sample 2 B) The molecules in sample 1 are moving faster than the molecules of sample 2 C) The temperature of sample 2 is higher than the temperature of sample 1 D) The water molecules in sample 2 are moving slower than the molecules in sample 1
Answer:
C
Explanation:
Increasing temp causes increased molecule movment in sample 2
What is the name of the colony shown?
Answer: New Hampshire
Explanation:
If it is the dark green then its New Hampshire :)
Answer:
New Hampshire ;)
Explanation:
New Hampshire is the dark green state on this map, and it is apart of the first 13 colony I hope that helped.
ANSWER ASAP PLEASE I NEED HELP!
Answer:
If I remember correctly it should be B because it went from Cu^2 to Cu^0
Explanation:
let's say these four solutions have the same concentration, which one has the highest freezing point?
Answer:
What are those for solution be specific
A reaction between an alcohol and an organic acid is classified as.
Answer:
esterification reaction ...........
What is the pH of a solution if the pOH is 7.09?
Answer:
pH = 6.91
Explanation:
Recall that at 25 °C, we have the relationship:
[tex]\displaystyle \text{pH} + \text{pOH} = 14.00[/tex]
Therefore, the pH of a solution with a pOH of 7.09 is:
[tex]\displaystyle \begin{aligned} \text{pH} + (7.09) & = 14.00 \\ \\ \text{pH} & = 6.91 \end{aligned}[/tex]
At which position is the northern hemisphere experiencing winter?
The image includes the position and tilt of Earth in its orbit around the sun. Earth is tilted away from the sun in position A. In position B, the sun shines evenly on Earth from pole to pole. Earth is tilted toward the sun in position C. In position D, the sun shines evenly on Earth from pole to pole.
Public Domain
Point A
Point B
Point C
Point D
Answer:
Point A
Explanation:
The Northern Hemisphere is furthest away from the sun in position A. Therefore the sunlight takes longer to reach the Earth which results in the Northern Hemisphere experiencing winter.
Point A represents the position where the northern hemisphere is experiencing winter.
This is because Earth's axis is tilted away from the sun at this point, causing the northern hemisphere to receive less direct sunlight and shorter days. As a result, the rays from the sun are spread over a larger area, making the sunlight less intense and leading to colder temperatures during this time of the year in the northern hemisphere.
In contrast, at Point C, the northern hemisphere experiences summer. This is when the Earth's axis is tilted towards the sun, causing the northern hemisphere to receive more direct sunlight and longer days, resulting in warmer temperatures.
Points B and D are the equinox positions when the sun shines evenly on Earth from pole to pole, and both hemispheres experience approximately equal day and night lengths. These are the times of the year when transitions between seasons occur.
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True or False? Mask mandates have been lifted on all college campuses. True False
Answer:
False
Explanation:
(pls help!) What mass of oxygen atoms is required to react completely with 30 u of hydrogen atoms?
One mole Hydrogen need 1/2mol O_2 .
Moles of Hydrogen
30u/1u30molMoles of O_2
30/215mol[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Let's get to the reaction first ~
[tex] \qquad \qquad \rm 2H_2 + O_2 \rightarrow 2H_2O[/tex]
Here, we can infer that if we need 1 mole oxygen gas to react with 2 moles Hydrogen gas.
So, the number of Oxygen gas molecules we need to react should be half the number of Hydrogen gas molecules.
Number of Hydrogen gas molecules is :
[tex]\qquad \sf \dashrightarrow \: \dfrac{30}{2} [/tex]
[tex]\qquad \sf \dashrightarrow \: 15[/tex]
Number of Oxygen gas molecules needed is :
[tex]\qquad \sf \dashrightarrow \: \dfrac{15}{2} [/tex]
Number of Oxygen atoms needed :
[tex]\qquad \sf \dashrightarrow \: \dfrac{15}{2} \times 2[/tex]
[tex]\qquad \sf \dashrightarrow \: {15} \: atoms[/tex]
One atom of Oxygen weight 16 u, so 15 atoms weight ~
[tex]\qquad \sf \dashrightarrow \: {15} \times 16[/tex]
[tex]\qquad \sf \dashrightarrow \: 240 \: u[/tex]
So, we need 240 u of Oxygen atoms to react completely with 30 u of Hydrogen atoms.
Calculate molecular mass of Ca(OH)2
Answer:
The molar mass of calcium hydroxide,
Ca(OH)2, is 74.092 g/mol.
Explanation:
The molar mass of a compound is determined by multiplying the subscript of each element in the formula by its molar mass (atomic weight on the periodic table) in g/mol, and adding the results.
The formula for calcium hydroxide is: Ca(OH)2
Molar Mass Ca(OH)2:
(1×40.078g/mol Ca)+(2×15.999g/mol O)+(2×1.008g/mol H)
=74.092 g/mol Ca(OH)2
Answer:
74.093 g/mol
Explanation:
Add the mass of Ca (found on the periodic table), the mass of 2 oxygens and 2 hydrogens together.
40.078+2(15.999)+2(1.00784)=74.093
What is the OH- in a solution with a pOH of 7.68?
Answer:
Explanation:
Answer: 1.380 × 10^-8 M
The pH is the measure of alkalinity or acidity of a substance.
It is the negative logarithm of H+ ions concentration [H+].
pH = -log[H+]
pOH on the other hand is negative logarith of OH- concentration [OH-].
pOH = -log[OH-]
In this case;
pOH = 7.86
We can calculate the [OH-]
pOH = -log[OH-]
But, pOH = 7.86
pOH = -log[OH-]
-log[OH-] = 7.86
[OH-] = Antilog -7.86
= 1.380 × 10^-8 M
Therefore, [OH-] is 1.380 × 10^-8 M
n the currently accepted model of the atom, a fuzzy cloud around a hydrogen nucleus is used to represent the
In the model of the atom, a fuzzy cloud around a hydrogen nucleus is used to represent the general region where the atom's electron is most likely located.
What is an atomic model?An atomic model is a graphic representation and/or diagram used to identify the components of atoms.
An atomic model may have into account all its components (i.e., electrons, protons, and neutrons).
In conclusion, in the model of the atom, a fuzzy cloud around a hydrogen nucleus is used to represent the general region where the atom's electron is most likely located.
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Which is a cause of chemical weathering?
A) ice
B) wind
C) oxygen
D) gravity
Answer:
The answer is C.
Explanation:
Oxygen- This is also an important cause of chemical weathering.
A reef which hugs the shore?
fringing reef..........
Please help! At a pressure of 200 atm, water’s melting point is approximately _____ (-2 C, 0 C, 10 C, or 370 C) and its boiling point is approximately ____ (370 C, 10 C, 0 C, -2 C)
At a pressure of 200 atm, water’s melting point is approximately 0⁰C and its boiling point is approximately 370⁰C.
What is melting point temperature?Melting point is the temperature at which a substance changes into liquid form.
From the chart, at a pressure of 200 atm, water’s melting point is approximately 0⁰C.
What is boiling point temperature?This is the temperature at which a liquid turns into a vapor. It is the temperature at which liquid and vapor co-exist.
From the chart, at a pressure of 200 atm, water’s boiling point is approximately 370⁰C.
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