is.
O2(g) + 2H2O(l) + 4e- -----------------> 4OH−(aq)
oxidation or reduction?
Answer:
Reduction
Explanation:
Oxidation is a process that involves loss of electrons.
Reduction is a process that involves gain of electrons.
In this equation, the electrons (4e-) are in the reactant side. This means that it is gain of electrons.
The reaction is a reduction reaction.
How many moles of water are produced when 6.0 moles of hydrogen gas react with 2.5 moles of oxygen gas?
Answer:
2.5 mole O2 should react (2 * 2.5) = 5.0 mole H2 but there is 6.0 mole H2. H2 remain in excess. O2 is the limiting reactant. mole of H2O formed = 2 * 2.5 = 5.0 mole.
Moles of water are produced when 6.0 moles of hydrogen gas react with 2.5 moles of oxygen gas
Balanced equation: 2H2 + O2 → 2H2O
2.5 mole O2 should react (2 × 2.5) = 5.0 mole
H2 but there is 6.0 mole H2.
H2 remain in excess. O2 is the limiting reactant.
mole of H2O formed = 2 × 2.5 = 5.0 mole.
= 5.0 mole
If less than 6 moles of oxygen are available per mole of glucose, oxygen is the limiting reactant. The ratio is 6 mole oxygen per 1 mole glucose, OR 1 mole oxygen per 1/6 mole glucose.
Limiting reactant-Limiting reactant- the reactant that determines the amount of product that can be produced because of the amount of that reactant present. Whichever reactant yields the LEAST amount of product is the limiting reactant. This will be completely used up in the reaction. After the reaction is complete, there will be product, and unused excess reactant.Learn more about oxygen gas, refer
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Why is it important to conserve or save our energy resources?
I will give Brainliest
Please Help
answer:
reducing energy use limits the number of carbon emissions in the environmentconserving energy produces a higher quality of life. Reduced emissions result in cleaner air qualityit helps create a healthier planet, or at least helps sustain the resources we already haveexplanation:
credits: online researchWhat is the specific heat capacity of a 70 g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C?
1.47 J/g°C is the specific heat capacity of a 70 g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C.
What is specific heat capacity?The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases by 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).
q = mCpΔT
Solve for Cp —> Cp = q/mΔT
q = -6700 J (negative because it released heat)
m = 70 g
ΔT = Final temp - initial temp = 25 - 90 = -65°C
Cp = (-6700 J) ÷ (70 g)(-65°C)
= 1.47 J/g°C
Hence, 1.47 J/g°C is the specific heat capacity of a 70 g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C.
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Mr. Smith and his friends go on a camping trip. They use propane (C3H8) to fuel their camping stove. Unfortunately it is raining outside and Mr. Smith decides it is best to use the camping stove to roast marshmallows inside the tent. What advice would you give Mr. Smith and why? (3 marks)
Answer:
I would tell him to open the tent in order to breathe frsh air.
Explanation:
Even if propane is not ignited, the buildup of the gas can be deadly due to inhalation. Breathing the gas can cause hypoxia, which is a form of oxygen deprivation that can lead to death. Hence you shouldnt use propane indoors.
What is the correct illustration of the bonding that occurs in H2O?
Answer:
covalent is the bonding that occurs in H2O
Explanation:
At which position on the diagram would an apple have the greatest potential energy?
Answer:
Position 1 because it is the highest from the ground.
Hope this helps!
what does energy mean?
Answer:
strength and vitality required for sustained physical or mental activity
Explanation:
Answer:
energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object.
What can the period number of an element tell us about that element?
Answer:
All of the elements in a period have the same number of atomic orbitals.
Explanation:
Help me please!
Main-block transition metals, such as iron, make good building materials for all of the following reasons EXCEPT____.
A. Resistance to corrosion
B. Insulation
C. Strength
D. High density
Explain the difference, with sketches, between the titration curves of monoprotic acid and a triprotic acid.
Answer:
A monoprotic acid has only one equivalence point in a titration curve while a triprotic acid has three equivalence points.
Explanation:
Monoprotic acids, HA, are acids that are able to donate one proton per molecule during the process of ionization or dissociation as shown below:
HA ----> H⁺ + A⁻
A triprotic acid is a polyproprotic acid, that is acids that can donate more than one proton per molecule during ionization. a triprotic acid can donate three protons per molecule during the process of ionization. The dissociation of a triprotic acid is shown below;
H₃A -----> H₂A⁻ + H⁺
H₂A⁻ ----> HA²⁻ + H⁺
HA²⁻ -----> A³⁻ + H⁺
The value Ka, is known as the acid dissociation constant. It is found by looking at the equilibrium constant for the dissociation of the acid. The higher the Ka, the more the acid dissociates
A titration curve is the plot of the pH of the analyte solution versus the volume of the titrant added as the titration progresses.
In a titration curve in which base is added to acid, the pH rises slowly until the equivalent point at which point the pH remains constant before it begins to rise again on the addition of more base.
In a titration curve of a monoprotic acid, there is only one region in which the equivalence point is obtained corresponding to the point of acid of dissociation of all its protons.
In the titration curve of a triproprotic acid, three equivalent points are obtained corresponding to the point of dissociation of each of three protons of the triprotic acid.
The titration curves are shown below
2. (1:25) How much does the moon pull on the Earth?
A. More than the Earth's pull on the moon
B. Less than the Earth's pull on the moon
C. Equal to the Earth's pull on the moon
Answer:
a. more than the earth pull on the moon sorry if false
Which component of weather describes the weight of the atmosphere pressing down on Earth? (2 points)
Air pressure
Air temperature
Precipitation
Wind direction
Answer:
Low-pressure systems are associated with clouds and precipitation that minimize temperature changes throughout the day, whereas high-pressure systems normally associate with dry weather and mostly clear skies with larger diurnal temperature changes due to greater radiation at night and greater sunshine during the day.
Explanation:
what are the affects of increasing thermal energy B
Answer:
The molecules tend to speed up and move faster throughout the substance once thermal energy increases. This is evident whenever we heat up water as its molecules tend to move faster throughout the water as thermal energy tends to increase
Hope this helps!
Students were asked to select methods to increase the rate of dissolving a solid. Which methods would increase the rate?
Increasing the surface area, stirring or agitating the mixture, raising the solvent's temperature, and employing a solvent with a stronger polarity or one that is more similar to the solid's chemical makeup are all ways to speed up the dissolving process.
The methods to increase the rate of dissolving a solid.There are several methods that can increase the rate of dissolving a solid, including:
Increasing the surface area of the solid by crushing, grinding or pulverizing it into smaller pieces.
- Stirring or agitating the mixture, which helps to distribute the solvent and increase contact between the solvent and the solid.
- Increasing the temperature of the solvent, which increases the kinetic energy of the solvent molecules, making them more likely to collide with and dissolve the solid.
- Using a solvent that has a higher polarity or is more similar in composition to the solid, which can increase the attraction between the solvent and the solid and promote faster dissolving.
Therefore, the methods that would increase the rate of dissolving a solid are increasing surface area, stirring or agitating the mixture, increasing the temperature of the solvent, and using a solvent that has a higher polarity or is more similar in composition to the solid.
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calculate the mass of 0.5mols of CH3COOH
Answer:
30 g
Explanation:
In order to convert from moles of CH₃COOH to grams, we need to use its molar mass:
Molar mass of CH₃COOH= (Molar Mass of C)*2 + (Molar Mass of H)*4 + (Molar Mass of O)*2 = 60 g/molNow we convert moles into grams:
0.5 mol * 60 g/mol = 30 gSo 0.5 moles of CH₃COOH have a mass of 30 grams.
Calculate the volume occupied by 2.00 moles of H2 at 300.0 K and 1.25
atm
Answer:
V = 39.38 L
Explanation:
Given that,
No. of moles of H₂, n = 2
Temperature, T = 300 K
Pressure, P = 1.25 atm
We need to find the volume occupied by the gas. We can use the ideal gas law to find it such that,
[tex]PV=nRT[/tex]
Where
R is gas constant, R = 0.08205 L-atm/mol-K
V is volume of the gas
Rearranging the above formula for V. So,
[tex]V=\dfrac{nRT}{P}\\\\V=\dfrac{2\times 0.08205\times 300}{1.25}\\\\V=39.38\ L[/tex]
So, the volume occupied by the gas is 39.38 L.
The volume occupied by this hydrogen gas is equal to 39.408 Liters.
Given the following data:
Temperature = 300 KPressure = 1.25 atm.Ideal gas constant, R = 0.0821 L⋅atm/mol⋅KNumber of moles = 2.00 moles.To determine the volume occupied by this hydrogen gas, we would use the ideal gas law equation;
[tex]V= \frac{nRT}{P}[/tex]
Where;
P is the pressure.V is the volume.n is the number of moles of a gas.R is the ideal gas constant.T is the temperature.Substituting the given parameters into the formula, we have;
[tex]V=\frac{2 \times 0.0821 \times 300 }{1.25} \\\\V=\frac{49.26}{1.25}[/tex]
Volume, V = 39.408 Liters.
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Pls help fast, I will give brainliest!
Answer:
c
Explanation:
When electrons lost a blank ion is formed
When electrons are gained a blank ion is formed
Answer:
I love it
Explanation:
☁️ Answer ☁️
annyeonghaseyo!
Your answer is:
When electrons are lost, a positively charged ion is formed. When electrons are gained, a negatively charged ion is formed. (I like the car)
Hope it helps.
Have a nice day noona/hyung!~ ￣▽￣❤️
What statements are true about mutations to DNA?
Answer:
Is this a general question or is there supposed to be a picture
Explanation:
What do you understand by a chemical reaction
Answer:
A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products. ... A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
A gas has a volume of 240.0mL at 25.0 oC and 0.79 atm. Calculate its volume at STP (1 atm and 0 oC).
Answer:
189.6 mL
Explanation:
As per Boyles law when a gas is kept at a constant temperature and mass in a closed container, the volume and pressure vary inversely.
P1V1= P2V2
Here, P1 = 0.79 atm, V1 = 240 ml, P2= 1 atm
therefore, substituting values in above equation we get
0.79×240 = 1×V2
⇒V2 = 189.6 ml
therefore, its volume at STP (1 atm and 0 oC) = 189.6 ml
1. Calculate the molarity of a solution containing 49.3g of dissolved naphthalene (C10H8) in 217g benzene (C6H6).
2. A solution is prepared by mixing 94.2g of H2O, and 58.7g of ethanol, C2H5OH. Determine the mole fractions of each substance.
3. If you use 2.17mol of sucrose (C12H22O12) and dissolve this into 0.500kg of H2O, what will be the change in the freezing point of your solution? The freezing point depression of water (Kf) is 1.86 degrees Celsius/m.
Answer:
1. 1.56 M
2. Water → 0.803
Ethanol → 0.197
3. - 8.07°C
Explanation:
1. To solve this problem, we need benzene's density in order to determine the volume.
We assume the volume of solvent, as the volume of solution
Density for benzene is 0.8786 g/mL.
Density = m/V → V = m/density
Volume = 217 g /0.8786 g/mL = 247 mL
We convert the mass to moles and then, to mmoles
49.3 g . 1mol / 128g . 1000mmol / mol = 385.1 mmol
M = 385.1 mmol / 247mL = 1.56 M
2. We determine moles of each, solute and solvent
94.2 g. 1mol /18g = 5.23 moles of water
58.7 g . 1mol /46g = 1.28 moles of ethanol.
Total moles = 5.23 + 1.28 = 6.51
Mole fraction of water = Moles of water / Total moles
Mole fraction of ethanol = Moles of ethanol / Total moles
Water → 5.23 / 6.51 = 0.803
Ethanol → 1.28 / 6.51 = 0.197
3. Freezing point depression → ΔT = Kf . m . i
i = Van't Hoff factor, ions that are present in the solution.
As the solute is organic, i = 1.
Kf = 1.86 °C/m
m = molality (moles of solute in 1kg of solvent)
2.17 mol / 0.5kg = 4.34 m
ΔT = Freezing T° of pure solvent - Freezing T° of solution.
We replace data → 0° - Freezing T° of solution = 4.34m . 1.86°c/m . 1
Freezing T° of solution = - 8.07°C
How many moles of solute should be dissolved into 3.0 L of solvent to make a concentration of 2.0 M?
6.0 mol
1.5 mol
0.67 mol
1.0 mol
Answer:
There are 0.1 moles of solute in 250 mL of 0.4 M solution.
what is nucular decay
Answer:
Nuclear decay is also called radioactive decay, and it occurs in a series of sequential reactions until a stable nucleus is reached. Nuclear reactions release much more energy—orders of magnitude more—than exothermic chemical reactions.
Explanation:
A cell is placed in a salt solution that has the same concentration as the inside of the cell. What will happen to the cell?
A) The cell will contract.
B) The cell will expand slightly.
C) The cell will burst.
D) The cell will remain the same size.
Answer:
d
Explanation:
I need help with dis hard stuff, you just need to make a thing on Constructing a Device to Regulate the Release of Energy
Answer:
Explanation:.the device controlled the activation as shown by the water holding room temperature for 15 seconds until activation by crushing the pills. The temperature rose 30° over two minutes, showing a measurable exothermic reaction from the Calcium Chloride dissolving in the water. Pour 5mL water in a quart bag Place Thermometer in the bag to make contact Fill two gelatin 000 capsules with 1 gram of Calcium Chloride Place capsules into the bag Wait 15 seconds to crush the capsules while they are submerged in the water Temperatures - 0 Seconds 75° 15 Seconds - Activation 75° 30 Seconds 85° 60 Seconds 95° 90 Seconds 104° 120 Seconds 105° Test #2 For this trial, the variables of the water Calcium Chloride will be increased by the factor of one.
Identify the reactant(s) in the chemical reaction, CO2 + H20 --> H2CO3. *
A. CO2, H20, and H2CO3
B. CO2 and H20
C. H2CO3
Answer:
The correct answer is B. From the chemical reaction, the reactants are carbon dioxide and water. Reactants are the substances that take part in the chemical reaction which, as a result, produces new substances called the products
Explanation:
Hope it helps
moles are in 4.3 * 10^22 molecules of H3PO4
Answer:
The answer is 0.073
Explanation:
Final step: 0.73 x 10^-1
UGRENT! Please help showing all work
Answer:
a. The limiting reactant is Ca(OH)₂
b. The theoretical yield of CaCl₂ is approximately 621.488 grams
c. The percentage yield of CaCl₂ is approximately 47.06%
Explanation:
a. The given chemical reaction is presented as follows;
Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O
Therefore;
One mole of Ca(OH)₂ reacts with two moles of HCl to produce one mole of CaCl₂ and two moles of water H₂O
The mass of HCl in an experiment, m₁ = 229.70 g
The mass of Ca(OH)₂ in an experiment, m₂ = 207.48 g
The molar mass of HCl, MM₁ = 36.458 g/mol
The molar mass of Ca(OH)₂, MM₂ =74.093 g/mol
The number of moles of HCl, present, n₁ = m₁/MM₁
∴ n₁ = m₁/MM₁ = 229.70 g/(36.458 g/mol) ≈ 6.3 moles
The number of moles of Ca(OH)₂, present, n₂ = m₂/MM₂
∴ n₂ = m₂/MM₂ = 207.48 g/(74.093 g/mol) ≈ 2.8 moles
The number of moles of Ca(OH)₂, present, n₂ = 2.8 moles
According the chemical reaction equation the number of moles of HCl the 2.8 moles of Ca(OH)₂ will react with, = 2.8 × 2 moles = 5.6 moles of HCl
Therefore, there is an excess HCl in the reaction and Ca(OH)₂ is the limiting reactant
b. According the chemical reaction equation the number of moles of CaCl₂ produced in he reaction by the 2.8 moles of Ca(OH)₂ = 2.8 × 2 moles = 5.6 moles of CaCl₂
The molar mass of CaCl₂ = 110.98 g/mol
The mass of the 5.6 moles of CaCl₂ = 5.6 moles × 110.98 g/mol ≈ 621.488 grams
The theoretical yield of CaCl₂ ≈ 621.488 grams
c. Given that the actual mass of CaCl₂ produced = 292.5 grams, we have;
The percentage yield of CaCl₂ = The actual yield/(The theoretical yield) × 100
∴ The percentage yield of CaCl₂ = (292.5 g)/(621.488 g) × 100 ≈ 47.0644646397%
The percentage yield of CaCl₂ ≈ 47.06%.
