Considering the definition of pH, the pH of a 6.3×10⁻⁸ M solution of H₃O⁺ is 7.2.
Definition of pHpH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:
pH= - log [H⁺]= -log [H₃O⁺]
The numerical scale that measures the pH of substances includes the numbers from 0 to 14. The pH value 7 corresponds to neutral substances. Acidic substances are those with a pH lower than 7, while basic substances have a pH higher than 7.
pH in this caseIn this case, you know that [H₃O⁺]= 6.3×10⁻⁸ M. Replacing in the definition of pH:
pH= -log (6.3×10⁻⁸ M)
Solving:
pH=7.2
Finally, the pH of a 6.3×10⁻⁸ M solution of H₃O⁺ is 7.2.
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Scientific theories are usually
A.
unable to change as new data or technology emerges.
B.
supported by evidence and widely accepted by the community.
C.
based on opinions and feelings.
D.
claims posed by individuals.
Answer:
B
Explanation:
Cuz they are supported once discovered and then widely spread then accepted
Answer:
B.
Explanation:
A scientific theory is a broad explanation that is widely accepted because it is supported by a great deal of evidence. Because it is so well supported, a scientific theory has a very good chance of being a correct explanation for events in nature. Because it is a broad explanation, it can explain many observations and pieces of evidence. In other words, it can help connect and make sense of many phenomena in the natural world.
HELP
which listed elements would form metallic bonds? Check all that apply
- Bi
- Xe
- I
- Ag
- Li
Answer:
Bi (Bismuth)
Ag (Silver)
Li (Lithium)
Explanation:
Xe (Xenon) and I (Iodine) are non-metals. They cannot from a metallic bond because metallic bonds are bonds between metals only.
24 g of sodium chloride at 25 °C are mixed with 272 g mercury at 50 °C. Find the
system's final temperature.
Answer:
the correct ans
Explanation:
The quantitative amount of energy that is necessary to provide to a substance whose temperature has to be increased is depicted as heat capacity. When the temperature is changed by one degree Celsius and the amount is fixed to one gram, then the heat capacity is depicted as specific heat capacity.
Dalton's Atomic Theory explains many well-established scientific laws including all of these except the
A. Law of Conservation of Mass.
B. Law of Definite Composition.
C. Law of Multiple Proportions.
D. Periodic Law.
Dalton's Atomic Theory explains many well-established scientific laws, including all of these except the law of Conservation of Mass. The correct option is A.
What is Dalton's Atomic Theory?According to the second component of the theory, the mass, and characteristics of every atom in a specific element are the same. Compounds, according to the third section, are combinations of two or more different kinds of atoms.
Dalton's theory thus recognized that all matter is made up of atoms, which is accurate, but it did not recognize the presence of smaller particles within atoms, which is wrong.
Dalton's theory, which claimed that atoms could not interact with one another, is erroneous because compounds are created by the fusion of two or more different kinds of atoms.
Therefore, the correct option is A. Law of Conservation of Mass.
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How is the kinetic energy of the particles that make up a substance different
after it changes state?
A. The kinetic energy is less after a substance changes from a liquid
to a gas.
OB. The kinetic energy is less after a substance changes from a gas to
a plasma
C. The kinetic energy is greater after a substance changes from a
liquid to a solid
D. The kinetic energy is greater after a substance changes from a
solid to a liquid.
Answer:
D. The kinetic energy is greater after a substance changes from a
solid to a liquid
Explanation:
During a phase change from solid to liquid, the particles making up the mobile becomes more mobile and as a result there is an increase in kinetic energy of the system.
Kinetic energy is the energy accrued due to the motion of a body. In a melting process where solids turn to liquid, there is an increase in kinetic energy. When randomness of a system increase, kinetic energy also increases. From liquid to gas and gas to plasma increases kinetic energy. In the other way round, the kinetic energy reduces.Answer:
D. The kinetic energy is greater after a substance changes from a solid to a liquid
Explanation:
The tallest building in the world, the burj khalifa in Dubai, is 0.828 kilometers high. What is the building height in centimeters
What is the molecular formula of a compound with an empirical formula of CFBrO and a molar mass of 254.7 grams per mole?
The molecular formula of a compound with an empirical formula of CFBrO and a molar mass of 254.7 grams per mole is C₂F₂Br₂O₂.
What is molecular formula ?Chemical element symbols, numbers, and occasionally additional symbols like parentheses, dashes, bracket, commas, and plus and minus signs are used in a chemical formula to represent information about the chemical proportions of the atoms that make up a certain chemical compound or molecule.
A molecule's molecular formula reveals which atoms and how many of each kind are included inside it. No subscript is used if there is just one atom of a certain kind. A subscript is added to the symbol for an atom if it contains two or more of a certain type of atom.
Its original definition, "the smallest unit of a material that yet preserves the qualities of that substance," was intended to be included by this designation.
Thus, The molecular formula of a compound with an empirical formula of CFBrO and a molar mass of 254.7 grams per mole is C₂F₂Br₂O₂.
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What is the purpose of the flame that is lit below a hot air balloon?
A. To decrease enthalpy
B. To decrease specific impulse
C. To increase enthalpy
D. To increase reduction
Answer:
A. To increase enthalpy
Explanation:
Because the burner is the engine of the hot air balloon it is what propels the hot air up into the envelope to make the balloon rise
suggest why the copper sulfate solution was left for four minutes before adding the magnesium
please help
Copper is unable to displace magnessium in a reaction so the copper sulfate solution was left for four minutes before adding the magnesium.
The electrochemical seriesThe electrochemical series shows the order of reactivity of the metals. The metals that are higher in the series can displace the metals that are lower in the series in a chemical reaction.
We know that copper is unable to displace magnessium in a reaction hence the reaction can not occur in the reverse direction. Hence, the copper sulfate solution was left for four minutes before adding the magnesium.
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How does benzene react with concentrated sulfuric acid?
Benzene reacts with concentrated sulfuric acid to form benzene sulfonic acid .
The reaction attached
Answer:
See below ~
Explanation:
can someone help with homework anyone? right now its science...
Answer:
Organ
Explanation:
Cells work together to make tissues, tissues work together to make organs, organs works together to make the organ system, and the organ system works to help the organism stay alive and do all of the physical stuff._.
The mobile electrons of a pure metal are
called what
Answer:
This means that the metal is more properly viewed as an array of positive ions surrounded by a “sea of mobile valence electrons.” Electrons which are capable of moving freely throughout the empty orbitals of the metallic crystal are called delocalized electrons (Figure below).
6. The following reaction occurs under standard conditions:
CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)
a. Which bonds are broken and which are formed during the reaction? (1 point)
b. Determine the enthalpy of the reaction. (2 points)
Answer:
a. CH4 → CO2 and H20
O2 → CO2 and H20
b. -890 kJ
Explanation:
As you move across the periodic table, from left to right, atoms tend to get smaller
because,
(0.5 Points)
they have more mass
they have less mass
they have more protons.
they have less electrons.
Explanation:
because they have more protons
answer correct
urgent
Answer:
i don't understand let us know which one you want us to answer
Given 3.50 mol of CH4, how many grams of Oz are required to completely react with all the CH4 CHP CH. + 20% CO2 - 2H2O 1
Answer:
2.7
Explanation:
Which are indicators that a chemical change has occurred? Check all that apply. change in odor change in shape change in energy change in color change in size o formation of a precipitate
Color change, formation of a precipitate, formation of a gas, odor change, temperature change is the correct answer
What is Chemical Indicator ?
Chemical indicators are substances that change color in response to changes in a chemical environment, such as changes in pH, temperature, or the presence of certain ions. They are commonly used in a variety of applications, such as quality control in manufacturing, medical diagnostics, and laboratory research. There are many different types of chemical indicators, including pH indicators, which change color in response to changes in the acidity or alkalinity of a solution, and redox indicators, which change color in response to changes in the oxidation state of a substance.
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Answer:
they're all right
Explanation:
on edge
Which substance gives heat and light after combustion?
Answer:
Magnesium oxide
Explanation:
The substance which undergoes combustion is said to be combustible.It is called fuel. If a magnesium ribbon is heated,it starts burning. When a magnesium ribbon burns,it combines with the oxygen of air to form magnesium oxide,and liberates heat and light.
HelpPPPP PLEASEES I need in 3 minutes
Which kind of wave is created by moving a spring toy up and down?
electromagnetic
longitudinal
transverse
surface
Answer:
Transverse!
Explanation:
Transverse is a more direct moving wave
The wave which is generated by moving a spring toy up and down is transverse wave. An electromagnetic wave is a transverse wave. The correct option is C.
What is transverse wave?A transverse wave is a progressive wave. The direction of propagation of a transverse wave is always perpendicular to its direction of vibration. They are non-mechanical waves which do not need a medium for propagation and they consists of crests and troughs.
When a toy spring is moved up and down, the generating waves that propagate in the horizontal direction while disturbing the toy spring in the vertical direction. In physics transverse wave is considered as a moving wave where oscillations are perpendicular to the direction of the wave.
The transverse waves are found commonly in elastic solids, oscillations, etc. The waves generated by moving a spring toy up and down is transverse wave.
Thus the correct option is C.
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PLEASE HELP
Use the periodic table to determine which of the following could be an isotope of bromine (Br). Check all that apply.
Z = 79, A = 196
Z = 35, A = 79
A = 79, N = 44
Z = 44, N = 44
Explanation:
The answer is:
z=35,A=79
and also
A=79,N=44
According to the statements of the question, atoms Z = 35, A = 79 (option B) and A = 79, N = 44 (option C) are isotopes of bromine.
Isotopes are atoms from the same element which has a different number of neutrons in their nucleus.
Bromine has an atomic number (Z) of 35 and an atomic mass (A) of 80. The number of neutrons of this atom is:
[tex] A = Z + N [/tex]
[tex] N = A - Z = 80 - 35 = 45 [/tex]
For an element to be an isotope of bromine, it must have the same Z (35) and a different value of N.
From the given options, the only one that has the same atomic number is option B (Z = 35, A = 79).
The number of neutrons of this isotope is:
[tex] N = A - Z = 79 - 35 = 44 [/tex]
Hence, option B is an isotope of bromine.
Option C is also an isotope because it is the same as option B, the number of neutrons is 44 and the atomic mass is 79. So, this isotope is the same as option B.
The other options, A (Z = 79, A = 196) and D (Z = 44, N = 44), are not isotopes of bromine because they are different elements, gold (Au) and ruthenium (Ru), respectively.
Therefore, options B and C are isotopes of bromine.
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I need help on this question
Answer:
The way its parts are arranged
Explanation:
1. Box A and box B have the same density.
Box A has more volume. Which box has
more mass?
a) Box A
b) Box B
Answer:
b
Explanation:
In a school’s laboratory, students require 50.0 ml of 2.50 m h2so4 for an experiment, but the only available stock solution of the acid has a concentration of 18.0 m. what volume of the stock solution would they use to make the required solution? use m subscript i v subscript i equals m subscript f v subscript f.. 0.900 ml 1.11 ml 6.94 ml 7.20 ml
The volume of stock solution they use to make the required solution is 6.94mL.
How we calculate the volume?To calculate the value of required volume we will use the below equation:
M₁V₁ = M₂V₂, where
M₁ = molarity of stock solution = 18M
V₁ = volume of stock solution = to find?
M₂ = molarity of H₂SO₄ solution = 2.50M
V₂ = volume of H₂SO₄ solution = 50mL
On putting all these values on the above equation and calculate for the value of V₁ as:
V₁ = (2.50)(50) / (18)
V₁ = 6.94mL
Hence correct option is (3) i.e. 6.94mL.
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Answer:
C. 6.94 mL
Explanation:
Correct on Edge 2022!!!
Good luck everyone, you got this! Have a great day!
1.
How much of the radiation from the sun reaches Earth’s surface?
50%
25%
70%
100%
2.
Which method of heat transfer is responsible for a person burning their hand on a stove?
convection
conduction
radiation
thermal energy
3.
Why is noon not the hottest part of the day if the sun is directly overhead?
The ground absorbs the solar radiation and releases it throughout the later afternoon.
The solar radiation is more direct at later times in the day.
The cloud cover at noon prevents solar radiation from reaching Earth’s surface.
The ground continues to absorb radiation until the sun goes down and releases it all at night.
4.
Which stage of the water cycle occurs when water vapor exits plants through their leaves?
transpiration
evaporation
condensation
precipitation
5.
Identify the method of heat transfer responsible for warm air masses rising, then cooling and condensing.
convection
radiation
thermal energy
conduction
6.
Identify the type of cloud that is associated with thunderstorms, hail, heavy rains, lightning, and tornadoes.
cirrostratus
cumulonimbus
altostratus
stratocumulus
7.
Earth’s albedo determines which of the following properties?
reflectivity of Earth’s atmosphere
reflectivity of Earth’s surface
amount of solar radiation that passes through the atmosphere
amount of heat absorbed by clouds
8.
What is the relationship between temperature and air pressure?
As temperature increases, air pressure increases.
As temperature increases, air pressure decreases.
There is no relationship between temperature and air pressure.
As temperature decreases, air pressure decreases.
9.
Identify the layer of the atmosphere that protects Earth from meteors.
troposphere
stratosphere
thermosphere
mesosphere
10.
What factors affect global winds?
jet streams, Hadley cells, and trade winds
Hadley cells, pressure belts, and the Coriolis effect
convection cells, pressure belts, and the Coriolis effect
convection cells, polar westerlies, and the greenhouse effect
11.
Which method of heat transfer do you experience when you put your hands near a fire and feel the warmth?
thermal energy
convection
radiation
conduction
12.
Which of the following choices is not a particulate that is found in the atmosphere?
water vapor
pollen
dirt
ash
13.
Which phenomenon is responsible for the blue color of the sky?
scattering
albedo
absorption
radiation
14.
Which layer of the atmosphere is the hottest layer?
thermosphere
troposphere
stratosphere
mesosphere
15.
Answer the question below.
Compare and contrast the four main types of clouds and the weather they indicate. Use details to support your answer.
16.
Which phenomena causes Earth’s winds to deflect as they move around the globe?
the Coriolis effect
the tradewinds
the greenhouse effect
uneven solar heating
17.
Which factor does not affect the amount of solar radiation that an area receives?
the location’s latitude
the time of year
the cloud cover in the area
the sun’s temperature
18.
Which type of cloud is associated with fair weather and appears long and wispy?
cumulus
stratus
alto
cirrus
19.
The rise of oxygen in the atmosphere allowed which of the following to form?
iron ores in the crust
cyanobacteria
UV radiation
the ozone layer
20.
Answer the question below.
Explain how global winds are created. Use details to support your answer.
21.
Which gas makes up the largest percentage of the atmosphere?
oxygen
methane
water vapor
nitrogen
22.
Identify the hypothesis that early life arose from organic compounds forming in the atmosphere because of the combination of gases present and lightning.
the Miller-Urey hypothesis
the Oparin-Urey hypothesis
the meteorite hypothesis
the Oparin-Haldane hypothesis
23.
Which example below would not be found on primitive Earth?
volcanoes
lightning storms
ammonia gas
oxygen gas
24.
Which type of cloud indicates that rain, snow, or thunderstorms are on the way?
cirrus
stratus
alto
cumulus
25.
How is absolute humidity measured?
It determines the mass of oxygen in a volume of air.
It determines the mass of water in a volume of air.
It determines the ratio of water in a volume of air to the total amount that the volume of air can hold.
It determines the percent of water vapor in the air.
I will mark brainliest.
Answer:
1) 70
2) conduction
3) The ground absorbs the solar radiation and
releases it throughout the later afternoon.
4) transpiration
5) convection
6) cumulonimbus
7) reflectivity of Earth’s surface
8) As temperature increases, air pressure
increases.
9) thermosphere
10) convection cells, pressure belts, and the
Coriolis effect
11) radiation
12) pollen
13) scattering
14) thermosphere
15) The different types of clouds are:
cumulus: Cumulus clouds are clouds which have flat bases and are often described as "puffy", "cotton-like" or "fluffy" in appearance. Their name derives from the Latin cumulo-, meaning heap or pile.
cirrus: Cirrus is a genus of atmospheric cloud generally characterized by thin, wispy strands, that typically appear white or light grey. The name is derived from the Latin word cirrus, meaning 'ringlet' or 'curling lock of hair'. Such a cloud can form at any altitude between 5,000 and 13,700 m above sea level.
stratus: Stratus clouds are low-level clouds characterized by horizontal layering with a uniform base, as opposed to convective or cumuliform clouds that are formed by rising thermals.
nimbus: Nimbostratus clouds are dark, grey, featureless layers of cloud, thick enough to block out the Sun and produce persistent rain. Height of base: 2,000 - 10,000 ft. Shape: Bands or areas of individual cells. Latin: nimbus - rainy cloud; stratus - flattened or spread out. Precipitation: Continuous rain or snow likely.
16) the tradewinds
17) the location’s latitude
18) Cirrus clouds
19) the ozone layer
20) Global winds are created by both the spin of
the Earth (Coriolis effect) and the differences
in temperature between the equator and
the polar areas. These winds are often
grouped together as trade winds, easterlies,
and westerlies.
21) nitrogen
22) the Miller-Urey hypothesis
the Oparin-Haldane hypothesis
23) ammonia gas
24) cumulus
25) It determines the mass of water in a volume of air
Explanation:
please please please mark me as brainliest
An allele that is not dominant is know as what
Answer:
Recessive
Explanation:
Hope this help I think this is the right answer.
please help me
law of conservation of matter facts or characteristics explain in your own words
I agree with the above answer.
How many g of CO2 is made from 5.75 g
of NaHCO3?
Explanation:
the answer of this question is 1.5 grams CO2
How many atoms does the formula 2HgO have?
Answer:
4
Explanation:
2HgO
2 * 1 Hg atom = 2 Hg atoms
2 * 1 O atom = 2 O atoms
2+2 = 4 atoms total
a gas occupies 3.5 L at standard pressure. find the volume of the gas when the pressure is 1.5 atm
Answer:
5.25 lit
Explanation:
[tex]standard \: pressure = 1atm[/tex]
[tex] \frac{3.5lit}{1atm} = \frac{x}{1.5atm} [/tex]
[tex]x = 5.25lit[/tex]