Answer: The pOH value is 2.
Explanation:
Given: [tex][H^{+}] = 9.9 \times 10^{-13} M[/tex]
pH is defined as the negative logarithm of hydrogen ion concentration.
Hence, pH of the given solution is calculated as follows.
[tex]pH = -log [H^{+}]\\= - log (9.9 \times 10^{-13})\\= 12[/tex]
The relation between pH and pOH is as follows.
pH + pOH = 14
Therefore, pOH is calculated as follows.
pH + pOH = 14
12 + pOH = 14
pOH = 14 - 12
= 2
Thus, we can conclude that the pOH value is 2.
subtracting atomic number from atomic mass will give the number of
Answer:
:)
Explanation:
If we subtract the atomic number from the atomic mass: atomic mass - atomic number = number of protons + number of neutrons - number of protons. Thus we get the number of neutrons present in an atom when we subtract the atomic number from the atomic mass.
~I will give the brainliest ~
Will the solubility of PbCl2 in 0.10 Molar PbBr2 be larger than, smaller than, or the same as in pure water?
A. the same
B. smaller
C. larger
D. cannot be determined
Answer:
Smaller
Explanation:
I took the test
H2O2 is what type of compound?
How much energy does a copper sample absorb as heat if its specific heat is 0.384 J/g.°C, its mass is 8.00 g, and it is
heated from 10.0°C to 40.0°C?
Answer:
.0016
Explanation:
For specific heat problems you use the formula :
Q = mcΔT
They've given you the m, c and delta T, so you can plug in those values. (for the temperature change subtract 10 from 40 to see that it grew 30 degrees)
You're looking for Q so leave that variable in the equation. Then solve.
.Q = (8.00)(.384)(30)
Q = 92.16
92.16 J energy will be absorbed by a copper sample.
Given:
Specific heat capacity, C= 0.384 J/g °C
Temperature, T₁ = 10.0°C and T₂= 40.0°C
Mass, m=8.00 g
We know that,
The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (g) of the material when its temperature increases or 1 °C, and its unit is J/g °C.
Heat energy in terms of specific heat energy can be calculated by using this formula:
Q= m. C. ΔT
∵ΔT= change in temperature,
ΔT=40.0-10.0°C=30°C
Now substituting the values in the above formula.
[tex]Q= 8.0*0.384*30=92.16J[/tex]
Hence, 92.16 J energy will be absorbed by a copper sample.
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Please help is for my final An example of a chemical change is-
evaporation of seawater
о
sublimation of dry ice (CO2)
melting of aluminum
burning wood reducing it to ashes
Explanation:
Souring of milk
Baking of cake
i need to do a science project and i have to write about "reducing ocean pollution" could anybody give my ideas? THANKS CHICAS
Answer:
decomposers
Explanation:
I'm not sure weather your supposed to create an actual experiment or write a paper. If an experiment, test certain acids to see which one can decompose plastics the fastest and determine which one can be spread through the oceans to melt down plastic. If a paper, discuss the idea of genetically modified fish. Some animals in the wild have the ability to eat pollution (wrappers, bottles, ect.), so mutating fish such as bottom feeders to be able to do the same would easily rid the water of pollution and make for one interesting of a paper! hope this sort of helped!
What percent of the water reactant is oxygen?
Answer:
Both hydrogen and oxygen gases exist as diatomic (“two-atom”) molecules. These molecules are the reactants in the reaction
Explanation:
:)
Which expression represents the pH of a solution?
Answer:
pH = 14 - pOH
pH = -log[H+]
pH = pKa + log [A-]/[HA]
Explanation:
The equation used depends on what is given in the equation.
The expression that represent the pH of the solution is
pH = 14 - pOH
pH = -log[H+]
pH = pKa + log [A-]/[HA]
What is the pH of the solution?It is the quantitative measure related to the acidity or the other liquid solutions. It should be range between the 1 and 10^-14. here the numbers be like from 0 to 14.
Hence, we can say that The expression that represent the pH of the solution is
pH = 14 - pOH
pH = -log[H+]
pH = pKa + log [A-]/[HA]
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What is the center of the atom called?
Group of answer choices
Electron
Neutron
Nucleus
Proton
Answer:
nucleus
Explanation:
thats 100% the answer
Helpppppp ASAP I will give correct answer brainliest 
Answer: capillaries are not used to exchange substances between the body cells
Explanation:
Arteries carry blood away from the heart. Veins carry blood to the heart except the hepatic portal vein. Capillaries are used to exchange substances between body cells.
How many liters of hydrogen are obtained from the reaction of 4.00 g sodium with excess water, at STP?
Answer:
V = 1.95 L.
Explanation:
Hell there!
In this case, according to the following reaction between sodium metal and water:
[tex]2Na+2H_2O\rightarrow 2NaOH+H_2[/tex]
We can realize that the moles of hydrogen can be calculated by using the initial mass of sodium, its atomic mass (23.0 g/mol) and the 2:1 mole ratio of sodium to hydrogen to obtain:
[tex]4.00gNa*\frac{1molNa}{23.0gNa} *\frac{1molH_2}{2molNa}=0.0870molH_2[/tex]
Finally, we calculate the volume of hydrogen by using the ideal gas equation whereas the pressure is 1 atm and the temperature 273.15 K according to the STP conditions:
[tex]PV=nRT\\\\V=\frac{nRT}{P}\\\\V=\frac{0.0870mol*0.08206\frac{atm*L}{mol*K}*273.15 K}{1 atm}\\\\V=1.95L[/tex]
Regards!
down there (pls hurry!!)
balance CO2+h2=C6H12O6+O2
Answer:
C 6 H 12 O 6 + 6 O 2 --> 6 CO 2 + 6 H 2 O + ATP is the complete balanced chemical formula for cellular respiration.
C
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C.
Show that the results of these dulys
Calculate the oxidation state of Manganese in the following
i. KMnO4 ii. Mno4-
i) KMnO4
lets calculate using x method
1+x+ 4(-2) = 0
1+x-8 =0
x= 7
ii)MnO4‐
x+4(-2) = -1
x-8 = -1
x = 7
Explain what will happen to the organisms that is affected by human activities.
Answer:
Human activity is by far the biggest cause of habitat loss.
Humans are now responsible for causing changes in the environment that hurt animals and plant species. We take up more space on Earth for our homes and cities. We pollute habitats. ... Human activity often changes or destroys the habitats that plants and animals need to survive.
Explanation:
Human activities are the various actions for recreation, living, or necessity done by people. For instance it includes leisure, entertainment, industry, recreation, war, and exercise.
Over time, destruction of such habitats leads to reduced biodiversity, weakening the Earth's ecosystems, and ultimately posing a major threat to human life. While, significant tracts of habitat have been lost, and along with them many species of plant and animal, steps can be taken to slow and even reverse the process.
One of the most significant ways in which humans have impacted on the lives of other species is by causing climate change. Many animals, including birds and frogs, now breed much earlier in spring in Britain than they did 20 years ago. Whether or not this is having a harmful effect on them has yet to be determined.
Helppppppppp pweaseeeee
Answer:
Explanation:
b
Pls help on test (no old answers OR files)
During a combustion reaction, 9.00 grams of oxygen reacted with 3.00 grams of CH4.
What is the amount of the leftover reactant?
0.74 grams of methane
0.89 grams of methane
1.22 grams of oxygen
1.45 grams of oxygen
How are radar and an approaching siren different? How are they similar?
A. Radar uses sound waves, and the siren uses radio, but both exhibit
the Doppler effect
B. Radar uses radio, and the siren uses sound waves, but both exhibit
the Doppler effect
C. The Doppler effect can be observed only with radar, but both
devices use sound waves.
D. The Doppler effect can be observed only in the approaching siren,
but both devices use radio.
Answer:
b
Explanation:
Radar uses radio, and the siren uses sound waves, but both exhibit the Doppler effect. Therefore, option (C) is correct.
What is Doppler's effect?Radar operates by emitting radio waves and measuring the reflected waves to detect objects and determine their velocity. On the other hand, an approaching siren emits sound waves that propagate through the air.
Both radar and an approaching siren exhibit the Doppler effect. The Doppler effect is the change in frequency or pitch of waves (sound or electromagnetic) when the source of the waves and the observer are in relative motion. In the case of radar, the Doppler effect is used to measure the velocity of objects based on the frequency shift of the reflected radio waves. Similarly, the Doppler effect is observed with an approaching siren as the sound waves compress and the frequency appears higher as the source approaches the listener.
Therefore, both radar and an approaching siren differ in the type of waves they use (radio waves vs. sound waves), but they share the characteristic of exhibiting the Doppler effect.
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I need help with this…and can you so the work if you can!!
Answer:
88 grams CO2
Explanation:
Convert from grams to moles to mole ratio to grams again
32 g CH4 * 1 mol CH4/16 g CH4 * 1 mol CO2/1 mol CH4 * 44 grams CO2 = 88 grams CO2
Lemme know if u need more explanation!
Consider the following reaction:
2CuCl2 + 4KI → 2CuI + 4KCl + I2
When 0.64 grams of CuCl2 reacts with 0.78 grams of KI, how many grams of I2 are formed?
What is the limiting reactant?
What is the excess reactant?
PLEASE I NEED HELP
Mention any two uses of oxygen gas.
Answer:
steel, plastics
Explanation:Hope it helps!
what things are needed to form a hail storm?
Answer:
Hail is a type of precipitation, or water in the atmosphere. Hail is formed when drops of water freeze together in the cold upper regions of thunderstorm clouds. These chunks of ice are called hailstones. Most hailstones measure between 5 millimeters and 15 centimeters in diameter, and can be round or jagged.
Explanation:
Calculate the number of moles of 2.00g of K2SO4
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:
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Determine the grams of water produced when 250 grams of barium hydroxide react
with 125 grams of HCI. Refer to the balanced equation below.
Ba(OH)2 (aq) + 2HCl (aq) --> 2H2O (l) + BaCl2 (aq) (balanced)
Answer:
Explanation:
Ba(OH)₂ (aq) + 2HCl (aq) --> 2H₂O (l) + BaCl₂ (aq)
171 g 2 x 36.5 g 2 x 18 g
73 g of HCl reacts with 171 g of Ba(OH)₂
125 g HCl reacts with 171 x 125 / 73 g of Ba(OH)₂
= 292.8 g of of Ba(OH)₂
Ba(OH)₂ available is 250 g , so it is the limiting reagent .
171 g of Ba(OH)₂ forms 36 g of water
250 g of Ba(OH)₂ forms 36 x 250 / 171 g of water
= 52.63 g of water.
what is the major role of wind on earth?
Answer: Wind, in climatology, the movement of air relative to the surface of the Earth. Winds play a significant role in determining and controlling climate and weather.
Two samples of hot unknown metals of equal temperatures are dropped in separate containers of water at 30 degrees Celsius. The final temperature of sample A is 33.5 degrees, and the final temperature of sample B is 31.8 degrees. Which metal sample had the highest specific heat?
Answer:
Sample B has the highest specific heat
Explanation:
Specific heat of a material is defined as the heat necessary to increase in the temperature of 1g of material in 1°C.
The material with the highest specific heat requires more energy to increase its temperature.
In the problem, sample A and B are under the same amount of energy but sample A increases more its temperature. That means sample A has the lowest specific heat and:
Sample B has the highest specific heatHow many Liters of water do you need to make 8g 10 HSiCl3 +15H,0—1 HS11001+30 HCI
A.9.81 L of water
B..015 L of water
C.2.45 L of water
D.6.51 L of water
Answer:
A maybe I said maybe hope help
Explanation:
..
Can someone pls pls help me with these questions?!?!
Answer:
13) What common form of energy (not including kinetic or potential) is not included in the “Energy Symbols” key that would normally be present in these examples?
1) Sound Energy
2) Magnetic Energy
14)Look carefully at each of the four systems shown above. Knowing what we have discussed about energy conversions, identify (list) at least three different places where this form of energy (sound) should be “produced”.
1) When you open the water tap, in the turbine and the sound of the light bulb.
2) In the light bulb
3) The sound of the kettle, the turbine and when water is boiling.
4) The movement of the wheel of the bicycle, the turbine and the light bulb.
50.0 grams of water vapor at STP occupies how much volume?
A 62.2 L
B 69.0 L
C 47.2 L
D 22.4 L
Answer:
22.4 L
hope it will help you