Answer:
pOH = -log₁₀ [OH-]
pH = 14 - pOH
Explanation:
First of all, calculate the value of pOH from the hydroxide concentration do this using the equation below;
pOH = -log₁₀ [OH-]
After obtaining the pOH, calculate pH using the equation below:
pH + pOH = 14
pH = 14 - pOH
Add coefficients to balance the equation to make water.
H2(g) +O2 (g)H20 (1)
Answer:
2H2+2O2=2H2O
Explanation:
hope this helps
What can you say about the forces between the particles of these gases)
Answer:
Gas – In a gas, particles are in continual straight-line motion. The kinetic energy of the molecule is greater than the attractive force between them, thus they are much farther apart and move freely of each other. In most cases, there are essentially no attractive forces between particles.
Explanation:hopes this helps:)
Find the number of grams in 16.95 mol hydrogen peroxide (H2O2). Round your
answer to two decimal places and be sure to include the proper units.
Answer: There are 576.46 number of grams present in 16.95 mol hydrogen peroxide [tex](H_{2}O_{2})[/tex].
Explanation:
Number of moles is defined as the mass of substance divided by its molar mass.
The molar mass of [tex]H_{2}O_{2}[/tex] is 34.01 g/mol. Hence, mass of hydrogen peroxide present in 16.95 moles is calculated as follows.
[tex]Moles = \frac{mass}{molarmass}\\16.95 mol = \frac{mass}{34.01 g/mol}\\mass = 576.46 g[/tex]
Thus, we can conclude that there are 576.46 number of grams present in 16.95 mol hydrogen peroxide [tex](H_{2}O_{2})[/tex].
Magnesium (used in the manufacture of light alloys) reacts with iron(III) chloride to form magnesium chloride and iron. A mixture of 41.0 g of magnesium and 175.0 g of iron(III) chloride is allowed to react. Identify the limiting reactant and determine the mass of the excess reactant present in the vessel when the reaction is complete. Select one: a. Limiting reactant is Mg; 7.4 g of FeCl3 remain. b. Limiting reactant is Mg; 46.5 g of FeCl3 remain. c. Limiting reactant is FeCl3; 1.7 g of Mg remain. d. Limiting reactant is FeCl3; 37.8 g of Mg remain. e. Limiting reactant is Mg; 134.0 g of FeCl3 remain.
Answer:
Limiting reactant is FeCl3; 1.7 g of Mg remain.
Explanation:
From the question;
The equation is;
3Mg(s) + 2FeCl₃(s) → 3MgCl₂(s) + 2Fe(s)
Amount of Mg = 41 g/24.31 g/mol = 1.687 moles
The limiting reactant yields the least amount of MgCl2
3 moles of Mg yields 3 moles of MgCl2
Hence 1.687 moles of Mg yields yields 1.687 moles of MgCl2
FeCl₃ = 175 g/162.2 g/mol = 1.0789 moles
2 moles of FeCl3 yields 3 moles of MgCl2
1.0789 moles of FeCl3 yields 1.0789 * 3/2 = 1.61835 moles of MgCl2
Hence FeCl3 is the limiting reactant
3 moles of Mg reacts with 2 moles of FeCl3
x moles of Mg reacts with 1.0789 of FeCl3
x = 3 * 1.0789 /2 = 1.61835 moles of Mg
Mass of Mg reacted = 1.61835 moles * 24.31 = 39.342 g
Mass of excess Mg = 41 g - 39.342 g = 1.7 g
How many moles are there in 8.25 x 10^26 molecules of methane (CH4)?
Answer:
i dont know
Explanation:
because i dont know 45
What is the pressure of the gas if we have 3.50 moles of helium at -50.0°C
in a rigid container whose volume is 25.0 liters?
003 kPa
-58.2 kPa
259.6 kPa
0.0 kPa
Answer:
259.6kPa
Explanation:
because it is big
18.2L of gas at 95°C and 760 torr is placed in a 15L container at 80 degrees * C ; what is the new pressure ?
Answer:
884.56 torr
Explanation:
Formula: [tex]\frac{P_{1}V_{1} }{T_{1}} = \frac{P_{2}V_{2} }{T_{2}}[/tex]
P = Pressure
V = Volume
T = Temperature in kelvin (Celsius + 273.15)
[tex]\frac{(760)(18.2) }{368.15} = \frac{P(15) }{353.15}[/tex]
[tex]P = \frac{(760)(18.2)(353.15) }{(368.15)(15)}[/tex]
P = 884.56169
What is the molarity of a solution made of 2.45 moles of LiCl in 4.75 L of solution?
Answer:
.52 M
Explanation:
moles ÷ liters = molarity
2.45 ÷ 4.75 = 0.5157894737
rounding it = .52
When a solute is added to water, the boiling point
Answer:
Boiling-point elevation describes the phenomenon that the boiling point of a liquid (a solvent) will be higher when another compound is added, meaning that a solution has a higher boiling point than a pure solvent. This happens whenever a non-volatile solute, such as a salt, is added to a pure solvent, such as water.
Bacteria live on skin of humans. The bacteria receive food and shelter form human beings. Most bacteria are harmless and pose little or no threat to humans. This is an example of
Answer: symbiotic relationship
Explanation:
What is the pH of a solution that contains 0.009 grams of oxalic acid in 100
mL of water?
Answer:
pH = 3.0 ya that's it......
Which of the following can be used to measure an object's
speed?
Answer:
distance traveled divided by the time it traveled
Explanation
this is just an equation for how to find speed. you can also just use like a meterstick and a stopwatch
HURRY PLEASE
What volume is occupied by 3.12 moles of a gas when the pressure is 88.4 kPa at a temperature of 19℃?
Answer:
The Combined Gas Law shows that the pressure of a gas is inversely proportional to volume and directly proportional to temperature. Avogadro's Law shows that volume or pressure is directly proportional to the number of moles of gas. Putting these together leaves us with the following equation:
P1×V1T1×n1=P2×V2T2×n2(11.9.1)
As with the other gas laws, we can also say that (P×V)(T×n) is equal to a constant. The constant can be evaluated provided that the gas being described is considered to be ideal.
The Ideal Gas Law is a single equation which relates the pressure, volume, temperature, and number of moles of an ideal gas. If we substitute in the variable R for the constant, the equation becomes:
P×VT×n=R(11.9.2)
The Ideal Gas Law is conveniently rearranged to look this way, with the multiplication signs omitted:
PV=nRT(11.9.3)
The variable R in the equation is called the ideal gas constant.
Explanation:
If 10.5 g of iron, at 25°C, absorbs 128 J of heat, what will be the final temperature of metal? (The specific heat of iron is 0.449 J g-1 °C-1)
Answer:
27.5°C = Final Temperature of the metal
Explanation:
The change in temperature using the specific heat of a material could be obtained using the formula:
Q = m*S*ΔT
Where Q is heat absorbed in Joules = 128J in the problem
m is the mass of the substance = 10.5g
S is Specific Heat of the substance = 0.449J/g°C for Iron
ΔT is change in temperature = Final T - Initial T
Replacing:
128J = 10.5g*0.449J/g°C*ΔT
2.5°C = ΔT
2.5°C = Final T - 25°C
27.5°C = Final Temperature of the metal
Concerning the disposal of materials at the end of the experiment, which methods are safe? Check all that apply.
[ANSWERS]
B. Dispose of pH paper in the trash.
C. Dump the cabbage indicator solution down the drain.
D. Ask your teacher to neutralize the acids and bases before disposal.
Answer:
B. Dispose of pH paper in the trash.
C. Dump the cabbage indicator solution down the drain.
D. Ask your teacher to neutralize the acids and bases before disposal.
Explanation:
Safe disposal of waste means disposal of waste in such a way that it does not pose a threat to the environment.
When pH paper is properly disposed in the trash, it does not constitute any risk to the environment.
When a cabbage indicator solution is disposed down the drain it does not contaminate the environment. It moves directly into the sewers and is properly disposed.
When acids and bases are properly neutralized before disposal, they don't lead to acid or base contamination of the environment.
Helppppppppp pweaseeeee
Answer:
Explanation:
b
HELP ASAP 10 POINTSSS
In this diagram, the medium on top is air and the medium on bottom is glass. Which vocab word best describes what is happening when the light wave passes from the air into the glass?
Question 2 options:
resolution
diffraction
refraction
reflection
Answer: refraction
Explanation: this is because during refraction light moves from one medium to another.
A compound contains 1.2 g of carbon, 3.2 g of oxygen and 0.2g of hydrogen. Find the formula of the compound
Answer:
The empirical formula of the compound is [tex]C_{0.504}HO_{1.008}[/tex].
Explanation:
We need to determine the empirical formula in its simplest form, where hydrogen ([tex]H[/tex]) is scaled up to a mole, since it has the molar mass, and both carbon ([tex]C[/tex]) and oxygen ([tex]O[/tex]) are also scaled up in the same magnitude. The empirical formula is of the form:
[tex]C_{x}HO_{y}[/tex]
Where [tex]x[/tex], [tex]y[/tex] are the number of moles of the carbon and oxygen, respectively.
The scale factor ([tex]r[/tex]), no unit, is calculated by the following formula:
[tex]r = \frac{M_{H}}{m_{H}}[/tex] (1)
Where:
[tex]m_{H}[/tex] - Mass of hydrogen, in grams.
[tex]M_{H}[/tex] - Molar mass of hydrogen, in grams per mole.
If we know that [tex]M_{H} = 1.008\,\frac{g}{mol}[/tex] and [tex]m_{H} = 0.2\,g[/tex], then the scale factor is:
[tex]r = \frac{1.008}{0.2}[/tex]
[tex]r = 5.04[/tex]
The molar masses of carbon ([tex]M_{C}[/tex]) and oxygen ([tex]M_{O}[/tex]) are [tex]12.011\,\frac{g}{mol}[/tex] and [tex]15.999\,\frac{g}{mol}[/tex], then, the respective numbers of moles are: ([tex]r = 5.04[/tex], [tex]m_{C} = 1.2\,g[/tex], [tex]m_{O} = 3.2\,g[/tex])
Carbon
[tex]n_{C} = \frac{r\cdot m_{C}}{M_{C}}[/tex] (2)
[tex]n_{C} = \frac{(5.04)\cdot (1.2\,g)}{12.011\,\frac{g}{mol} }[/tex]
[tex]n_{C} = 0.504\,moles[/tex]
Oxygen
[tex]n_{O} = \frac{r\cdot m_{O}}{M_{O}}[/tex] (3)
[tex]n_{O} = \frac{(5.04)\cdot (3.2\,g)}{15.999\,\frac{g}{mol} }[/tex]
[tex]n_{O} = 1.008\,moles[/tex]
Hence, the empirical formula of the compound is [tex]C_{0.504}HO_{1.008}[/tex].
What are the only types of metals that be magnetized?
Can someone help me with these answers please I’ll give Brainly !!!!
1.What's the first thought that comes to mind when you hear "nuclear"? nuclear, that's the word. well the first thing that comes into everyone's mind in nuclear and they have to think it then think of words that associate with it.
2.the most important point of something.
3.test site
4.
Which forward reaction shows an increase in entropy (disorder)?explain
A.H2(g) + CuO (s) --> H2O(l) + Cu(s)
B.HCl(g) + NH3(g) --> NH4Cl(s)
C.CaCO3(s) -> CaO(s) + CO2g)
D.H2O(g) + O2(g) --> 2H2O)
Explanation:
Entropy also increases when solid reactants form liquid products. Entropy increases when a substance is broken up into multiple parts. The process of dissolving increases entropy because the solute particles become separated from one another when a solution is formed. Entropy increases as temperature increases. S = entropy
k_{b} = Boltzmann constant
\ln = natural logarithm
\Omega = number of microscopic configurations
A sample of helium has a volume of 3.49 L at 741 mmHg. What would be the volume if the pressure
were changed to 760 mmHg at the same temperature?
show work
P1: 741 mmHg
V1: 3.49 L P1 x V1 / P2= (741 mmHg) (3.49 L) / 760 mmHg = 3.40 L
P2: 760 mmHg
V2: ? L
On a hot day, a 15.0 kg window increased from 20.0 degrees C to 26.7 degrees C. How much heat energy did the glass window absorb? (specific heat of glass = 0.840 J/gC)
Answer: The heat energy absorbed by glass window is 84420 J.
Explanation:
Given: Mass = 15 kg (1 kg = 1000 g) = 15000 g
Initial temperature = [tex]20^{o}C[/tex]
Final temperature = [tex]26.7^{o}C[/tex]
Specific heat capacity = [tex]0.840 J/g^{o}C[/tex]
Formula used is as follows.
[tex]q = m \times C \times (T_{2} - T_{1})[/tex]
where,
q = heat energy
m = mass of substance
C = specific heat capacity
[tex]T_{1}[/tex] = initial temperature
[tex]T_{2}[/tex] = final temperature
Substitute the values into above formula as follows.
[tex]q = m \times C \times (T_{2} - T_{1})\\ q = 15000 g \times 0.840 J/g^{o}C \times (26.7 - 20)^{o}C\\q = 84420 J[/tex]
Thus, we can conclude that the heat energy absorbed by glass window is 84420 J.
The name for the process that causes fertile land to become dirt-like is??
Deforestation
Urbanization
Construction
Desertification
Answer:
Desertification?
Explanation:
Desertification is when fertile lands become desert like
Which of the following represents alpha decay?
Answer: b
Explanation: alpha decay or particle consist of two protons and two neutrons hence it is a helium nucleus.
An alpha particle [tex]\binom {4} {2}[/tex]He is produced in alpha decay reactions, while the parent nucleus' atomic number and mass number drop by 2 and 4 correspondingly.
Alpha decay:Alpha decay is a nuclear process whereby an unstable nuclear transforms into a different element by ejecting particles composed of two protons and two neutrons. The alpha particle also referred to as a helium nucleus, is the expelled unit of matter. Alpha particles have large masses and electrostatic attraction.An atomic number decreases by 2 and the atomic weight drops by 4 when a radioactive nucleus disintegrates by emitting [tex]\bold{\alpha}[/tex] particle.Therefore, the final answer is "Option B".
Find out more about the alpha decay here:
brainly.com/question/14081292
21. An object appears blue when seen in sunlight. The same object is illuminated by a mixture of equally bright red and green light. It is also viewed through a blue filter. What color does the object appear to be? A. Blue B. Cyan C. Black D. Green
Answer: Green.
Explanation: Because object appears to be blue in sunlight, it absorbs counter colour of blue, also orange-red colour. So, when illuminated with
red-green colour, red light is more absorbed and object appears to be green.
At a high concentration do you have more or less particles per unit volume
Answer:
More particles per unit volume
Explanation:
Concentration means the amount of solute in a solution. Now, the amount of solute also means the number of particles of solute present in a solution.
Hence, when we use the term "high concentration", we imply that the amount of solute present or the number of particles present in a solution is high.
Thus, at high concentration, there are more solute particles than solvent particles in a solution.
A gas has a temperature of 14 °C, and a volume of 4.5 liters. If the temperature is raised to 29
°C and the pressure is not changed, what is the new volume of the gas
The new volume of the gas wii be 4.7 liters.
Which type of changes are melting, freezing, and boiling?
Answer:
the changes are physical changes
Hydrogen gas can be produced in the laboratory by the reaction of magnesium metal with hydrochloric acid, according to the following equation:
Mg(s) + 2HCl(aq) --> MgCl2(aq) + H2(g)
a. How many grams of hydrogen can be produced when 4.00 g of HCl is added to 3.00 g of Mg?
b. Assuming STP, what is the volume of this hydrogen?
Answer: 0.11 g H2
Explanation: just took test and got it right