Answer:
The pH of a solution with a Hydronium (H₃O⁺) ion concentration of 0.001 M is 3.
Explanation:
pH, short for Hydrogen Potential, is a measure used to establish the level of acidity or alkalinity of a solution.
pH indicates the amount of hydrogen ions present in a solution or substance. Mathematically the pH is the negative logarithm of the molar concentration of hydrogen ions or protons (H⁺) or hydronium ions (H₃O⁺).
pH= - log [H⁺]= - log [H₃O⁺]
The pH scale goes from 0 to 14. Values less than 7 indicate the range of acidity and those greater than 7 indicate alkalinity or basicity. The value 7 is considered neutral.
In this case, [H₃O⁺]= 0.001 M.
Replacing in the definition of pH:
pH= - log (0.001 M)
Solving:
pH= 3
The pH of a solution with a Hydronium (H₃O⁺) ion concentration of 0.001 M is 3.
What is the measure of the indicated angle? 37∘ 53∘ 180∘ 127∘
Answer:
53∘
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Bones connect to each other at .......
*At 25 °C, gas in a rigid cylinder with a movable piston has a volume of 145 mL and a pressure of 125 atm. Then, the gas is compressed to a volume of 80mL What is the new pressure of the gas if the temperature is at 30°C?
Answer:
Pressure will increase by the direct ratio of the volume change. Therefore, since volume changes from 145 to 80, pressure will go up by the ratio change 145÷80 times the original pressure 125 kPa. Sure, you can use the more complicated gas law equation PV = nRT but we are only varying volume so the question boils down to the change in one simple variable.
Putting them together we have: 145÷80 x 125 = 226.5625 or just 226 kPa since the accuracy of the figures and the equation are not great.
Describe what is wrong with this sentence:
"When you kick a soccer ball, you create new
kinetic energy!"
Answer:
You transfer kinetic energy from you foot to the ball.
Explanation:
Energy cannot be created or destroyed.
Answer:
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Is oil a reasonable energy source? Why or why not?
Answer:
No, it is not.
Explanation:
Oil is a non-renewable source of energy. ... Burning oil can pollute the air. Much of our oil has to be imported and it is becoming more and more expensive as reserves reduce and imports increase. Producing electricity from crude oil is expensive compared to other fossil fuels such as coal or gas.
*You Can put this in your own words
(b) Potassium and sodium are kept in dark reagent bottles filled with paraffin oil.
Explain why.
Answer:
these metals are stored in kerosene because kerosene contains no water and protects these metals from being exposed to any moisture in the air that would cause these metals to react, potentially violently.
When calcium carbonate is heated strongly, carbon dioxide gas is evolved. CaCO3(s) → CaO(s) + CO2 (g) If 4.74 g of calcium carbonate is heated, what volume of CO2 (g) would be produced when collected at STP?
Answer:
1.06 liters of gas are produced
Explanation:
Our reaction is:
CaCO₃(s) → CaO(s) + CO₂ (g)
This is the decomposition of calcium carbonate.
Ratio is 1:1:1
1 mol of carbonate can decompose to 1 mol of oxide and 1 mol of oxygen.
We convert mass to moles:
4.74 g . 1 mol /100.08g = 0.0474 moles
These are the moles of oxygen produced.
We know that 1 mol of any gas at STP is contained in 22.4L
0.0474 mol . 22.4L /mol = 1.06 L
how has the study of fossil rocks evolved over time? (personal answer)
Answer:
When an organism dies, it is usually destroyed by other forms of life and by weathering processes. On rare occasions some body parts—particularly hard ones such as shells, teeth, or bones—are preserved by being buried in mud or protected in some other way from predators and weather. Eventually, they may become petrified and preserved indefinitely with the rocks in which they are embedded. Methods such as radiometric dating—measuring the amounts of natural radioactive atoms that remain in certain minerals to determine the elapsed time since they were constituted—make it possible to estimate the time period when the rocks, and the fossils associated with them.
What is the total volume of water that you have if you calculated that it
weighs 180g?
The temperature of 170 g of a material decreases by 20.0⁰C when it loses 3050 J of heat. What is its specific heat
Answer:
0.897 J/g.⁰C
Explanation:
Given the following data:
m = 170 g (mass)
ΔT = 20.0⁰C (change in temperature)
q = 3050 J (amount of heat)
The amount of heat (q) is calculated as follows:
q = m x Cp x ΔT
Thus, we introduce the data in the mathematical expression to calculate the specific heat (Cp):
Cp = q/(m x ΔT) = 3050 J/(170 g x 20.0⁰C) = 0.897 J/g.⁰C
There are 1 1/2 times the amount of
we need on the planet today
Speed is the rate of change of position expressed as _____ traveled per unit of time. A. direction B. meter C. displacement D. distance... Help!!!
Answer:
Speed is the rate of change of position expressed as distance travelled per unit of time .
Explanation:
CSC Unit 3
Question 28 of 33
Which of the following molecules has a trigonal-pyramidal shape?
A. SeF6
B. SO2
C. BH3
D. PH3
What is the mole ratio of magnesium carbonate to magnesium oxide? MgCO3 →MgO+CO2
a)3:2 b) 1:3 c) 1:1 d) 1:2 e) 2:3
Answer:
d)1:2
Explanation:
find the ratio of the initial volume to final volume if the temperature of the gas is changed from 27°C to 127°C at constant pressure.
Answer: The ratio of the initial volume to final volume for the given gas is 27 to 127 L at constant pressure.
Explanation:
Given: [tex]T_{1} = 27^{o}C[/tex]
[tex]T_{2} = 127^{o}C[/tex]
According to Charle's law, for an ideal gas pressure is directly proportional to the temperature at constant pressure.
So, formula used to calculate the ratio of the initial volume to final volume is as follows.
[tex]\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}[/tex]
Substitute the values into above formula as follows.
[tex]\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}\\\frac{V_{1}}{V_{2}} = \frac{T_{1}}{T_{2}}\\\frac{V_{1}}{V_{2}} = \frac{27}{127}[/tex]
Hence, we can conclude that the ratio of the initial volume to final volume for the given gas is 27 to 127 L at constant pressure.
The FM station broadcasts traditional music at 102 MHz on your radio units for FM frequencies are given in MHz. Find the wave length of radio station in metres (m), nanometre(nm) and angstrom(Å).
Answer:
λ = 2.94 m (in meters)
λ = 2.94 x 10⁹ nm (in nanometers)
λ = 2.94 x 10¹⁰ A (in angstrom)
Explanation:
The wavelength of the radio station can be given as follows:
[tex]\lambda = \frac{c}{f}\\[/tex]
where,
λ = wavelength = ?
f = frequency = 102 MHz = 1.02 x 10⁸ Hz
c = speed of light = 3 x 10⁸ m/s
Therefore,
[tex]\lambda = \frac{3\ x\ 10^8\ m/s}{1.02\ x\ 10^8\ Hz}[/tex]
λ = 2.94 m (in meters)
λ = (2.94 m)(10⁹nm / 1 m)
λ = 2.94 x 10⁹ nm (in nanometers)
λ = (2.94 m)(10¹⁰ A / 1 m)
λ = 2.94 x 10¹⁰ A (in angstrom)
How does a nuclear power plant create electricity?*
A: A nuclear reaction burns fuel
B: A nuclear reaction caused water to flow, which is then what creates electricity
C: A nuclear reaction creates heat which is applied to water to create steam
D: A nuclear reaction creates an electrical current
Answer:
CExplanation:
Answer:
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what are protons, what is their charge, and where they located?
When more gas particles are added to the same space, how will the behavior change?
Answer:
The particles move very fast and collide into one another, causing them to diffuse, or spread out, until they are evenly distributed throughout the volume of the container. When more gas particles enter a container, there is less space for the particles to spread out, and they become compressed.
Explanation:
PLEASE HELP DUE IN 20 MINUTES Find the empirical formula for the following problem. Remember to show your work if you want
to earn credit.
1. One mole of an unknown compound has 36.0 g of carbon and 6.0 g of hydrogen. What
is the empirical formula of the unknown compound? (Hint: You will want to reduce to find
the empirical formula)
Given: Carbon: 36.0 grams
1 mol C = 12.0 g
Hydrogen: 6.0 g
1 mol H = 1.0 g
Unknown: empirical formula
Solve:
Answer:
CH2
Explanation:
The empirical formula is the simplest formula of a chemical compound. It shows the ratio in which constituent atoms are combined in the compound.
To obtain the empirical formula, we divide the given mass of each element by the relative atomic mass of that element.
C- 36.0 g/12.0 g H- 6.0g/1.0g
C- 3 H-6
Divide through by the lowest ratio;
C-3/3 H- 6/3
C-1 H-2
Hence the empirical formula of the compound is
CH2
Why can more water vapor (water molecules that are in the gas state of matter) be present in warm air than in cold air?
Answer:
Because warm air is less dense
Explanation:
What of reaction is Zn + H2S =ZnS + H2
The division of Earth’s history into smaller units makes up the ____.
Answer:
geologic time scale
hope this helps
have a good day :)
Explanation:
The atomic model that describes an atom as a spherical object containing a certain number of electrons trapped in a mass of positive charge is often called the ___________ model.
help
zinc crystals is made from zinc Oxide and which acid
Answer:
hydrochloric acid
Explanation:
Zinc oxide will react with hydrochloric acid to form zinc chloride and water.
sulphuric acid
So to make zinc sulphate crystals you add granulated zinc to heated sulphuric acid
What is the specific heat of a metal (in J/g℃) that weighs 150 g and absorbs 1.2 kJ (or 1,200 J) of heat when the temperature rises by 50.0℃?
Answer:
0.16 J/g℃
Explanation:
We have the following data:
heat = 1,200 J
mass of metal = m = 150 g
change in temperature = ΔT = 50.0℃
The heat absorbed is calculated by using the following equation:
heat = m x Cp x ΔT
So, we introduce the data in the equation to calculate the specific heat of the metal (Cp), as follows:
Cp = heat/(m x ΔT) = (1,200 J)/(150 g x 50.0℃) = 0.16 J/g℃
why is hydrogen a nonmetal,usually placed with group 1 elements in the periodic table even though it does not show a metallic property like the alkalietals?
Periodic table has been divided into three, one is metal, second is non metal and third metalloid. Therefore, hydrogen is considered as non metal.
What is metal?Metals are those elements which is hard, conduct electricity, ductile, lustrous and malleable.
Lets take property
1.Since metals have free electrons that's why they can conduct electricity
2. Since atoms in metals are very closely packed in a definite crystal so Aluminium is solid. It is not brittle that is it can not be broken down easily
3. It does not react with water.
4.It is denser than water hence it sink in water.
Since hydrogen has only 1 electron in its outermost shell, to complete its duet and gain stability, hydrogen has to gain 1 electron just like halogen. So, on this basis hydrogen is considered as non metal.
Therefore, hydrogen is considered as non metal.
Learn more about the metals, here:
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URGENT ! PLEASE ANSWER QUICKLY
Calculate the volume of a NaCl solution that would contain 5.0 g of NaCl and have a molarity of 4.8 M.
Calculate the pH for a solution with a 4.6 x 10-9 M hydronium concentration.
Answer:If we dissolve NaF in water, we get the following equilibrium:
text{F}^-(aq)+text{H}_2text{O}(l) rightleftarrows text{HF}(aq)+text{OH}^-(aq)
The pH of the resulting solution can be determined if the K_b of the fluoride ion is known.
20.0 g of sodium fluoride is dissolve in enough water to make 500.0 mL of solution. Calculate the pH of the solution. The K_b of the fluoride ion is 1.4 × 10 −11 .
Step 1: List the known values and plan the problem.
Known
mass NaF = 20.0 g
molar mass NaF = 41.99 g/mol
volume solution = 0.500 L
K_b of F – = 1.4 × 10 −11
Unknown
pH of solution = ?
The molarity of the F − solution can be calculated from the mass, molar mass, and solution volume. Since NaF completely dissociates, the molarity of the NaF is equal to the molarity of the F − ion. An ICE Table (below) can be used to calculate the concentration of OH − produced and then the pH of the solution.
Explanation:
Answer:
not sure if this is 100% correct but this is what i got first question: molarity=mol/L 5g*1mol/58.44g=5/58.44 =0.085558mol 4.8m=0.085558/L L=0.0178
jiujuan avatar
second question: pH = - log [H3O+] pH= -log [4.6*10^-9] = 8.33724216
Explanation:
Which two moon phases can occur while the
relative positions of the sun, Earth, and moon
form a straight line?
Answer:
its the lunar and solar eclipse
Explanation:
the solar eclipse happens when the moon is in between the sun and earth
a gas measured a volume 100 mL under pressure of 740 mmHg. What would the volume be under a pressure of 780 mmHg with constant temperature
Answer:
94.87 mLExplanation:
The new volume can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we're finding the new volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
We have
[tex]V_2 = \frac{100 \times 740}{780} = \frac{74000}{780} \\ = 94.8717...[/tex]
We have the final answer as
94.87 mLHope this helps you