Answer:
pH = 1
Explanation:
pH = - log [1.0*10(^-1) ]= 1
Calculate the number of atoms in 4.8 dm^3 of neon gas at rtp
No of atoms in 4.8 dm³ of neon gas is determined in the following way.
Explanation:
We have given
Neon Gas=4.8dm³
At STP
1 mole of an ideal gas occupies 22.4 L(dm³) of volume.
which means that number of molecules occupy 22.4 L of volume.
So
4.8 dm³x 1 mole/22.4 dm³ = 0.214 moles Neon
0.214 moles x 6.02x10²³ atoms/mole = 1.29x10²³ atoms of Neon
No of Atoms in 4.8dm3 neon gas =1.29x10²³ atoms of Neon
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Final answer:
To find the number of atoms in 4.8 dm³ of neon gas at rtp, we calculate the moles of neon and then multiply by Avogadro's number, resulting in approximately 1.29 x 10²³ atoms.
Explanation:
To calculate the number of atoms in 4.8 dm3 of neon gas at room temperature and pressure (rtp), we can use Avogadro's law which states that one mole of an ideal gas occupies 22.4 liters (or dm³) at rtp. Thus, to find the number of moles of neon gas, we divide the volume of the gas by the molar volume at rtp (22.4 dm3/mol).
Number of moles (n) = volume / molar volume = 4.8 dm3 / 22.4 dm³/mol = 0.214 moles
To find the number of atoms, we multiply the number of moles by Avogadro's number (6.022 x 10²³ atoms/mol).
Number of atoms = number of moles x Avogadro's number = 0.214 moles x 6.022 x 10²³atoms/mol = 1.29 x 10²³atoms
Therefore, there are approximately 1.29 x 10²³ neon atoms in 4.8 dm³ of neon gas at rtp.
what is considered to be an unsafe level of lead in flint michigan water?
Answer:
More than 40 percent measured above 5 ppb of lead, which the researchers considered an indication of a “very serious” problem.
An unsafe level of lead in Flint, Michigan's water is above 15 ppb, with the Flint water crisis revealing levels up to 13,200 ppb, which far surpasses the hazardous waste threshold. This contamination caused significant health risks and highlighted environmental injustice.
An unsafe level of lead in the water of Flint, Michigan is considered to be above 15 parts per billion (ppb), as set by the federal government's lead and copper rule. However, during the Flint water crisis, Virginia Tech researchers found levels of lead ranging from 200 ppb to as high as 13,200 ppb, well above both the federal action level and levels classified by the EPA as hazardous waste (5,000 ppb).
The Flint water crisis led to contaminated drinking water that exposed residents to dangerous lead levels, linked to a range of health issues, particularly in children, such as learning disabilities, growth impairments, and anemia. The crisis also exposed systemic issues, including environmental injustice, especially affecting communities of color and low-income families.
What is transition metals oxidation state?
Which of the following air fronts does not move?
a Occluded front
b Cold front
c Stationary front
d Warm front
Determine the oxidation STATE of S in LiSO4
Answer:
Element: S O
Oxidation number: +6 -2
Explanation:
50 + 25 pts 75 for right answer
Some physical properties of matter include:
density
color
reactivity
luster
abundance
taste
source
Answer:
soe are appearance, texture, color, odor, melting point, boiling point, density, solubility, polarity, and many other
Explanation:
-, How many food Calories (Kcal) are in 3500 joules
Answer:
3500 Calorie
Explanation:
Fill in the blanks on this equation, and how did you do it?
____ Al(NO3)3+____(NH4)3PO4 ——> AlPO4+_____ NH4NO3
you need 3 ammonium nitrate, done by balancing equations
reaction type: metathesis (double displacement)
https://youtu.be/UGf60kq_ZDIBalance the equation Rb + Au2O3
Answer : The balanced chemical reaction will be:
[tex]6Rb+Au_2O_3\rightarrow 2Au+3Rb_2O[/tex]
Explanation :
As per question, when rubidium react with gold oxide then it gives rubidium oxide and gold.
This reaction is a single replacement reaction in which more reactive element displaces the least react element from its solution.
The balanced chemical reaction will be:
[tex]6Rb+Au_2O_3\rightarrow 2Au+3Rb_2O[/tex]
In a chemical reaction, which event ALWAYS occurs as the reaction proceeds?
A. the rearrangement of electrons to break or form chemical bonds
B. the release of energy to the environment
C. the absorption of energy from the environment
D. a change in total mass
Answer:
B
Explanation:
Answer:it would really be A
Explanation:
How many moles are in 56.7 L of CO2
Answer: 1,270.08L
Explanation:
Ten gallons of water is a measurement of its mass. True False
Answer:
True
Explanation:
Its used to measure mass. Ten gallons weigh 8 pounds.
:D
Have a good day flopper :D
*eliza*
Answer:
false
Explanation:
weight and mass are very different your weight can change but your mass cannot so if you add 10 there isnt a difference in the mass
Which of the following is NOT one of the information
chemicals stored in DNA?
a. adenino
b. guanine
c. cytosing
d. sulfide
Answer: Option B) sulfide
Explanation:
DNA is the main genetic material found in living organisms, and helps in the transmission of traits from parents to offspring through the genes.
It consists of several repeating units of polydeoxynucleotides composed of chemical like nitrogenous bases (such as thymine, cytosine, adenine and guanine), deoxyribose sugar and phosphate groups.
Thus, sulfide are not present in DNA
In terms of bond energies of the chemicals involved, why can hydrogen can be used as a fuel?
Answer:
see below
Explanation:
Hydrogen reacting with oxygen to generate water produces a relatively large amount of thermal energy. As requested and in terms of bonding energies, a Hydrogen - Oxygen fuel cell reaction could be illustrated as follows...
H - H + 1/2(O = O) => H - O - H
ΔHb: 1mol(-436Kj/mol) 1/2mol(498 Kj/mol) 1mol(-463 Kj/mol)
= -436Kj = -249Kj = -926Kj
ΔH(Rxn) = ∑ΔH(Products) - ∑ΔH(reactants)
= [(-926kj)] - [(-436Kj) + (-249Kj)]
= (-926 + 436 + 249)Kj = -241Kj (=> which is the Standard Heat of Formation of Water => See Thermo Tables in text appendix).
This means, on reaction of Hydrogen and Oxygen, 241Kj energy is released by exothermic process. The challenge now, is to direct this 241Kj of energy into a material substance so as to generate useful outcomes (work).
Now one should understand that the source of the energy in this problem is from the hydrogen - oxygen reaction, however, there are other mechanisms and reactions that generate thermal energy. Hydrogen fuel cell is but one.
So, now what does one do with the thermal energy generated in the fuel cell reaction. That is, what application would be needing 241Kj of energy per mole water formed? Consider two needed (hypothetical) applications => 1. to boil water and the other 2. to warm a tub of bathwater.
Our physics friends tell us that the amount of thermal heat used is related to the mass of substance receiving the heat and the resulting temperature change accompanying the transfer of thermal energy by the following equation ...
q = mcΔT where q = thermal energy. m = mass, c = specific heat & ΔT = Temperature change.
Given that both applications will receive the same amount of thermal energy ( => 241Kj) the question is reduced to how much mass would be needed to heat the water to boiling for application 1 vs amount of water to moderately heat water for a bath.
Application 1 (Boiling water) => 241Kj energy would only need a small quantity of water to achieve a high enough temperature to reach boiling point where as, Application 2 (Warming bath water) => 241Kj energy would be applied to a much larger quantity of water to limit the heating effect to a moderate temperature level.
In summary, the hydrogen-oxygen fuel cell reaction produces thermal energy => the thermal energy is directed into a mass of substance that is then heated to a needed temperature level to perform a functional service. The services derived from the H/Oxy rxn are, in essence, the utility of the process as a fuel. :-)
Addendum => The Hydrogen Electrochemical fuel cell process is the same except the process is galvanic in nature but still generates the same amount of thermal energy which is translated directly into electrical energy for needed applications.
2 Points
Which of these is a benefit of using cotton grocery bags?
Answer:
What are the options given?
Answer:They can be used over or 100 times without tear.
Explanation: A P E X
How many grams of magnesium nitrate (Mg(NO3)2) are required to make a 4M solution in 1.5 L of solution
Answer:
Mass = 889.8 g
Explanation:
Given data:
Mass of Mg(NO₃)₂ required = ?
Volume of solution = 1.5 L
Molarity of solution = 4 M
Solution:
we will calculate the number of moles from molarity formula then we will calculate the mass from number of moles.
Formula:
Molarity = number of moles / Volume in L
4 M = number of moles / 1.5 L
Number of moles = 4 M× 1.5 L
Number of moles = 6 mol/L × L
Number of moles = 6 mol
Mass of Mg(NO₃)₂:
Mass= number of moles ×molar mass
Mass = 6 mol × 148.3 g/mol
Mass = 889.8 g
Which of these is a problem with using nuclear energy?
A.
It is very expensive to use.
B.
It is a non-renewable energy source.
C.
There aren't enough qualified technicians.
D.
We don't have a way to contain the radioactive waste produced.
Answer:
D
We don't have a way to contain the radioactive waste produced.
Explanation
Nuclear waste is non disposable and takes millions of years to biodegrade and lose it radio activeness
Which best describes the formation of metamorphic rock?
They are formed through the cooling and hardening of magma or
lava, both below Earth's surface or on Earth's surface as volcanic
rocks.
They are formed by deposited sediment, usually at the bottom of
lakes and oceans, that is compressed over time into solid layers of
rock
They are formed as extreme weather elements, like tornadoes and
floods, break down mountains and other rock landforms into smaller
pieces.
They can be formed from any of the three rock types, withstanding
high temperatures and pressures, and forming new minerals without
melting.
D)
Answer:
D)They can be formed from any of the three rock types, withstanding
high temperatures and pressures, and forming new minerals without
melting.
Explanation:
The metamorphic rocks are formed through cooling and hardening of magma or lava, both below Earth's surface or on Earth's surface as volcanic rocks. Thus the correct option is A.
What is metamorphic rock?The type of rock which are generated when rocks are subjected to many physical changes such as heat, pressure and different chemical reactivity over a long period of time are called metamorphic rocks.
The process of metamorphism makes the rocks as chemically modified and recrystallized. This process does not melt the rocks, but it transforms the rocks into dense and compact rocks.
The common metamorphic rocks are marble, schist, phyllite, etc. The action of pressure and temperature can even change the metamorphosed rocks into new types. They can be even folded and squished.
The term meta means change and morph means form. This rocks are formed as a result of geological process such as magma intrusions.
Thus the correct option is A.
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Which substance contains bonds that involve a transfer of electrons from one atom to another
A beach towel is laying on the sand in the sun. Why does the sand feel hotter
to touch than the towel?
O
A. The sand is at a higher temperature.
O
O
B. The sand has a temperature far above absolute zero.
O
C. The sand has a higher latent heat of fusion.
O
D. The sand has a higher conductivity.
O
D. The sand has a higher conductivity.
Option D is the correct choice. The sand feels hotter than the beach towel due to its higher thermal conductivity, which keeps heat near the surface.
The reason the sand feels hotter to touch than the beach towel is due to its higher thermal conductivity. This concept in Physics explains that materials with higher conductivity transfer heat more efficiently. In this case, the sand absorbs heat from the sun and retains it at the surface, making it feel hot when touched.
Let's break down the options given in the question:
The sand is at a higher temperature: While this is true, it doesn't completely explain why the sand feels hotter.The sand has a temperature far above absolute zero: This is not relevant to the question since both the sand and the towel are above absolute zero.The sand has a higher latent heat of fusion: This property relates to how a material changes state from solid to liquid, which is not applicable in this context.The sand has a higher conductivity: This is the correct answer. Sand's low thermal conductivity means the heat absorbed stays near the surface, whereas materials like the towel distribute the heat more evenly.Hence, the sand feels hotter to the touch than the towel because of its higher thermal conductivity, which keeps the surface warmer.
what are the three states of matter?
Answer:
the three main states of matter are solid, liquid and gas
Explanation:
Balance the nuclear reaction equation for the beta minus decay of nickel-63 by completing the missing numbers.
The superscript of nickel is
.
The subscript of copper is
.
Answer: 63 & 29
Explanation:
Answer:
The superscript of nickel is
63
The subscript of copper is
29
Explanation:
C2H2 + 2H2 → C2H6
How many moles of hydrogen are needed to produce 13.78 mol of ethane?
Answer:
27.56 moles
Explanation:
Answer:
27.56 mol ans C)
Explanation:
The atomic number of silver-108 is 47. Its mass number is 108. How many protons and neutrons does silver-108 contain? A. 47 protons, 61 neutrons B. 47 protons, 108 neutrons C. 61 protons, 47 neutrons D. 108 protons, 47 neutrons
option A :47 protons and 60*neutrons
Silver-108 has an atomic number of 47, which indicates it has 47 protons. Since the mass number 108 represents the sum of protons and neutrons, subtracting the atomic number (or proton count) from the mass number will give the count of neutrons, hence, 61 neutrons. Therefore, Silver-108 contains 47 protons and 61 neutrons.
Explanation:The atomic number of an element represents the number of protons in its nucleus. So, silver-108 contains 47 protons because its atomic number is 47. The mass number of an element, on the other hand, is the sum of its protons and neutrons. So in the case of silver-108, if we subtract the atomic number (number of protons) from the mass number, we can determine the number of neutrons. Thus, 108 (mass number) - 47 (atomic number) equals 61. Therefore, silver-108 contains 47 protons and 61 neutrons.
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Natural gas is a relatively clean burning fuel, meaning it produces less _________ than oil or coal.
Answer:
Burning natural gas
Explanation:
hope this helps mark me as brainliest pls :)
Natural gas is a relatively clean burning fuel, meaning it produces less burning than oil or coal.
What is natural gas ?Methane makes up the majority of natural gas, which is a combination of gaseous hydrocarbons that also contains minor quantities of other higher alkanes. Typically, trace gases including helium, nitrogen, hydrogen sulfide, and carbon dioxide are also present in low concentrations.
When burning natural gas for energy, less carbon dioxide ( CO₂ ) and almost all other air pollutants are released into the atmosphere than when burning coal or petroleum products to provide the same amount of energy.
One of the cleanest and safest fuels is natural gas. In comparison to other fossil fuels, it produces less pollution. When natural gas is consumed, it mostly emits water vapor and carbon dioxide, which are also gases that people exhale.
Thus, Natural gas is a relatively clean burning fuel, meaning it produces less burning than oil or coal.
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What mass of nitrogen is required to react with 16 grams of oxygen?
Approximately 8.53 grams of nitrogen is required to react with 16 grams of oxygen.
Explanation:To determine the mass of nitrogen required to react with 16 grams of oxygen, we need to set up a balanced chemical equation that represents the reaction between nitrogen and oxygen. The balanced equation is:
2 N₂ + O₂ → 2 NO
From the equation, we can see that 2 moles of nitrogen react with 1 mole of oxygen to produce 2 moles of nitrogen monoxide. Using the molar masses of nitrogen and oxygen (14 g/mol and 16 g/mol, respectively), we can calculate the molar mass of nitrogen monoxide as 30 g/mol.
Since the ratio of nitrogen to oxygen in the balanced equation is 2:1, we can set up a proportion to find the mass of nitrogen needed:
(16 g O₂) / (30 g N₂O) = (x g N₂) / (1 g O₂)
Solving for x, we find that approximately 8.53 grams of nitrogen is required to react with 16 grams of oxygen.
Final answer:
To react with 16 grams of oxygen to form nitrous oxide, you need 14 grams of nitrogen based on the stoichiometric ratio from the balanced chemical equation involving nitrogen and oxygen.
Explanation:
The question is about a chemical reaction involving nitrogen and oxygen to form an oxide of nitrogen. To find out the mass of nitrogen required to react with 16 grams of oxygen, we need to refer to the balanced chemical equation. Since 16 parts by weight of oxygen can combine with 28 parts by weight of nitrogen to form nitrous oxide (N₂O), this gives us a clear stoichiometric ratio to work with.
As oxygen has a molar mass of 16 g/mol, and nitrogen has a molar mass of 14 g/mol, the reaction for producing nitrous oxide can be represented as:
2N₂ (g) + O₂ (g) → 2N₂O (g)
From this equation, 1 mole of oxygen gas (O₂), which is 32 grams (since O₂ means two oxygen atoms), reacts with 1 mole of nitrogen gas (N₂), which is 28 grams (since N₂ means two nitrogen atoms).
Thus, we can set up a simple proportion:
32 grams of O₂ react with 28 grams of N₂16 grams of O₂ will react with X grams of N₂By cross-multiplication:
32 g O₂ / 28 g N₂ = 16 g O₂ / X g N₂
32X = 16 × 28
X = (16 × 28) / 32
X = 14 grams of N₂
Therefore, 14 grams of nitrogen are required to react with 16 grams of oxygen to form nitrous oxide.
Substances that are more dense have ___________ (lower or higher) specific gravity.
Answer:
Higher
Explanation:
The answer is higher because Specific gravity is the density of a substance divided by the density of water. Specific gravity is almost always very close to the same value as the density is, meaning the higher, or more dense, a substance is, the higher the specific gravity is.
How much energy would need to be input to completely boil 17.3 moles of ice starting at 0 degrees * C and going to 100°C?
(H=40.5 kJ/mol ; H = 6.0kJ / (mol) ; specific
Answer:
[tex]Q = 934.911\,kJ[/tex]
Explanation:
The energy needed to boil 17.3 moles of ice is:
[tex]Q = (17.3\,mol)\cdot \left[\left(40.5\,\frac{kJ}{mol} \right)+ \left(\frac{4.186}{1000}\,\frac{kJ}{g\cdot ^{\circ}C} \right)\cdot \left(\frac{18.015\,g }{1\,mol} \right)\cdot (100^{\circ}C-0^{\circ}C)+\left(6\,\frac{kJ}{mol}\right)\right][/tex][tex]Q = 934.911\,kJ[/tex]
Which of these is most likely true about the front located in the area north of Austin? A. It will arrive over Phoenix in the next few days. B. It will bring a short period of snow to the area north of Austin. C. It will bring a long period of rain to the area north of Austin. D. It is moving quickly to the northeast.
Answer:
It will bring a long period of rain to the area north of Austin.
Explanation:
Study island said it was right.
3. Categorize the following cases into melting, boiling, freezing, condensation, or sublimation.
a. Decreasing size of moth balls.
b. Preparing ice-cream.
C. Candle wax dripping on candlestick.
d. Formation of clouds.
e. Hot water springs.
Worksheet: Physical Behavior of Matter
Discovery Communications Inc.
a. Decreasing size of moth balls. - Sublimation
b. Preparing ice-cream.- Freezing
c. Candle wax dripping on candlestick.- Melting
d. Formation of clouds.- Condensation
e. Hot water springs.- Boiling
Sublimation can be defined as the process in which the solid substance is converted into gaseous substance without being compared into liquid. Moth balls are made up of naphthalene. These are used as insecticide and kept along with clothes. These moth balls are converted into dry air. Preparing an ice cream requires freezing that is keeping a liquid into lower temperature to solidify. Candle wax may melt in the presence of heating source. Melting is a process in which a solid is broken down into liquid in the presence of heat. Condensation is the process in which the hot vapor is converted into liquid form. The condensation occurs when the hot vapors are converted into clouds. Boiling is a process in which the liquid is exposed to raised temperature. The hot water springs occurs due to groundwater being heated up by the hot steam liberated from the magma below the earth crust.Learn more about condensation:
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