Select all the correct answers.
Which two generalizations can be made based on what you know about cycles of matter in a closed system?
o New matter is added, and old matter is destroyed.
O Matter changes its physical form, allowing it to return to its original state.
O The amount of matter within the system remains the same.
O Matter and energy can cross the boundaries of the system.
The cycle has a well-defined starting and stopping point.
PLSS HELP
Answer:
3) The amount of matter within the system remains the same
5) The cycle has a well-defined starting and stopping point.
Explanation:
A closed system is a system that the boundaries of a system cannot be passed by either matter or energy.
Hence, generalisations can be made based on a closed system and the law of conservation of mass which states that matter can neither be created nor destroyed but can only change form.
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which of these materials is best used as a lubricant to reduce friction on gears
a.sand
b.oil
c.water
d.alcohkl
How many atoms of oxygen are present: 3Al2(SO4)3
a. 36
b. 12
c. 10
d. 24
Answer:
the answer is 12
Explanation:
In one formula unit of Al2(SO4)3 A l 2 ( S O 4 ) 3 , there would be twelve atoms of oxygen.
Which of these events leaves small pieces of rocks in new places? (4 points)
a
Deposition
b
Weathering
c
Erosion
d
Oxidation
Answer:
Deposition
Explanation:
Deposition is a process that lays down sediment and changes the shape of the land.
A heterogeneous mixture is:
A. composed of atoms bonded together.
B. composed of different parts that are indistinguishable in their color, texture, or appearance.
C. composed of only one type of element.
D. composed of different parts that are distinguishable in their color, texture, or appearance.
Answer:
B
Explanation:
A mixture in which the composition is not uniform throughout.
Same thing letter B says.
what is hydrogen alkali metal or halogen
Answer:
Hydrogen is neither an alkali metal or halogen.
Explanation:
It has the properties of both groups and so it's position is uncertain.
H2S what species are present at 10-6 mol/L or greater when dissolved in water
Answer:
the answer has been given below have a good day
Explanation:
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The species are present at 10-6 mole/L or greater when dissolved in water is when in solutions, weak acids and bases partially ionize.
What is ionization?Ionization is defined as anything that causes electrically neutral atoms or molecules to gain or lose electrons in order to become electrically charged atoms or molecules (ions). One of the main mechanisms by which radiation, including charged particles and X-rays, transmits their energy to matter is ionization. An anion is created when an atom or molecule picks up an electron; a cation is created when they lose an electron.
Weak Acids and Weak Bases Ionizing. Numerous acids and bases are weak, meaning they do not completely ionize in aqueous solution. The nonionized acid, hydronium ion, and conjugate base of a weak acid are all mixed together to form a solution in water, with the nonionized acid being present in the highest concentration.
Thus, the species are present at 10-6 mole/L or greater when dissolved in water is when in solutions, weak acids and bases partially ionize.
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A 76.89 g sample of a hydrocarbon(CxHy) has a mass of hydrogen that is equal to 10.45 g. Given this information, determine the empirical formula of this hydrocarbon. {MMC=12.01 and MMH=1.008}.
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Answer:
the empirical formula will be CH2
Explanation:
C
[tex] = \frac{66.44}{12} \\ = \frac{5.536}{5.536} \\ = 1 \\ = 1 \\ h \\ \frac{10.45}{1} \\ = \frac{10.450}{5.536} \\ = 1.88 \\ = 2[/tex]
Three quantum numbers are derived from Schrodinger’s equation that describe the probability of finding an electron around a nucleus: the principal quantum number, the angular momentum quantum number, and the magnetic quantum number. Explain each quantum number, including associated shapes, numbers, letters, and values in your own words.
Principle: Orbital size & main energy level
Angular: Orbital shape
Magnetic: Orbital orientation
Orbital size is Principle; main energy level is Principle; shape is Angular; orientation is Magnetic
Principle:
imagine a bullseye. each ring shows how far its from the nucleus
Angular:
0 looks like circle
1 looks like a bowtie
2 looks like a flower or 4 leaf clover
3 looks like multiple lobes
Principle Quantum Number: It describes the size of the orbital and the main energy level. It is represented by n. Where, n = 1,2,3,4....stands for K, L, M, N shell and so on..
Angular momentum Quantum Number : It describes the shape of the orbital. It is represented as 'l'. The value of l ranges from 0 to (n-1). For l = 0,1,2,3... the orbitals are s, p, d, f...
Magnetic Quantum Number : It describes the orientation of the orbitals. It is represented as . The value of this quantum number ranges from . When l = 2, the value of will be -2, -1, 0, +1, +2.
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Bonding with intermolecular forces:
1.) is CH3F a hydrogen bonding? yes or no?
2.) is CH3F dipole-dipole interactions? Yes or no?
3.) is CH3F a london dispersion forces? Yes or no?
Explanation:
1.) is CH3F a hydrogen bonding? yes or no? = No, CH3F is not a hydrogen bonding beacuse the molecule lacks hydrogen atoms bonded to nitrogen, oxygen, or fluorine; ruling out hydrogen bonding.2.) is CH3F dipole-dipole interactions? Yes or no? = Yes, CH3F is a dipole-dipole interactions beacuse in it's molecule, there are no metal atoms to form ionic bonds3.) is CH3F a london dispersion forces? Yes or no?= Yes, CH3F is a london dispersion forces because in it's molecule, there are no metal atoms to form ionic bonds .The intermolecular forces present in the bonding of CH₃F are dipole-dipole interactions and London dispersion forces.
1.) No, CH₃F does not exhibit hydrogen bonding. Hydrogen bonding occurs when a hydrogen atom is bonded to a highly electronegative atom such as fluorine, oxygen, or nitrogen. In CH₃F, the hydrogen atom is bonded to carbon, which is not highly electronegative.
2.) Yes, CH₃F exhibits dipole-dipole interactions. Dipole-dipole interactions occur between molecules that have permanent dipoles due to the electronegativity difference between the atoms. In CH₃F, the fluorine atom is more electronegative than the carbon and hydrogen atoms, resulting in a polar molecule with a permanent dipole moment.
3.) Yes, CH₃F exhibits London dispersion forces. London's dispersion forces, also known as Van der Waals forces, are present in all molecules and arise from temporary fluctuations in electron distribution. Although CH₃F has dipole-dipole interactions, it also experiences London dispersion forces due to the temporary shifts in electron density.
Hence, the bonding in CH₃F was explained above.
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What is the specific heat of a mystery substance that requires 79 joules of energy to heat 4.52
grams of substance from 23 degrees Celsius to 54 degrees Celsius?
The specific heat of a mystery substance that requires 79 joules of energy to heat 4.52 grams of substance from 23 degrees Celsius to 54 degrees Celsius is 0.56 J/g°C.
How to calculate specific heat capacity?The specific heat capacity of a substance can be calculated using the following formula:
Q = mc∆T
Where;
Q = quantity of heat absorbed or released (J)m = mass of substancec = specific heat capacity∆T = change in temperature (°C)c = Q/m∆T
c = 79 ÷ 4.52 × (54 - 23)
c = 79 ÷ 140.12
c = 0.56 J/g°C
Therefore, the specific heat of a mystery substance that requires 79 joules of energy to heat 4.52 grams of substance from 23 degrees Celsius to 54 degrees Celsius is 0.56 J/g°C.
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Best way to deal with calculations in chemistry?
Answer: Look up a video, and they will tell/show you.
If a sample originally had 120 atoms of carbon-14, how many atoms will remain after 17,145 years? Assume the half life of C14 is 5715 years.
Answer:
15 atoms left after 3 half lives
Explanation:
17145 y / 5715 y/halflife = 3 half lives
(1/2)^3 = 1/8 of original is left
1/8 ( 120 atoms) = 15 atoms left
Which equation shows how frequency is related to velocity and wavelength?
The equation that shows how frequency is related to velocity and wavelength is f = v / λ (Option A)
What is frequency?This is defined as the number of oscillations made in one second. It is expressed as
Frequency (f) = 1 / period (T)
f = 1 / T
Relationships between frequency, wavelength and velocityThe velocity, frequency and wavelength of a wave are related according to the following equation
v = λf
Making f the subject, we have
f = v / λ
Thus, we can conclude that the correct answer to the question is:
f = v / λ (Option A)
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what were possible experimental reasons for error in determining the neutralizing power of antacids ?
1000*
Explanation:
the deter monagex has to neutralize power because of the error and that leads to 1000*
Which of the following is not true concerning aluminum?
Group of answer choices
Aluminum weighs twice as much as the same size piece of steel.
It takes about two metric tons of aluminum oxide to produce one metric ton of aluminum.
Aluminum corrodes more slowly than iron does.
It takes about 17,000 kilowatt hours of electricity to produce one metric ton of aluminum.
The statement that is true about aluminum is that it corrodes more slowly than iron does.
What is Aluminum?Aluminum is a slivery white metal that have atomic number of 13. It is most coon metal and make more than 8% of the Earth's core mass. It's also the third most common chemical element Earth. It is malleable and soft.
It is use for making kitchen utensils, cans and so on.
Aluminum cannot be decomposed by chemical methods.
Therefore, The statement that is true about aluminum is that it corrodes more slowly than iron does.
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Identify the combustion reaction.
C4H12 + 7O2 ⟶ 6H2O + 4CO2
2H2 + O2 ⟶ 2H2O
Al2S3 ⟶ 2Al + 3S
Cl2 + 2KBr ⟶ 2KCl + Br2
Answer:
2kci,3H12,702,c02g k 4 t v6vuvi
How many atoms are in 0.560 moles of iron?
Answer:
3.37 × 10²³ atoms
Explanation:
Number of atoms = number of moles × 6.02 × 10²³
Number of atoms = 0.560 × 6.02 × 10²³
Number of atoms = 3.37 × 10²³ atoms
The partial pressures of gases A, B, and C in a mixture are
0.75 atmosphere, 0.25 atmosphere, and 1.25 atmospheres,
respectively. What is the total pressure of the gas mixture
in millimeters of Hg?
A. 1710 mm of Hg
B.
1140 mm of Hg
C. 760.0 mm of Hg
D. 570.0 mm of Hg
Answer:
A
Explanation:
.75 + .25 + 1.25 = 2.25 atm
1 atm is 760 mm hg
2.25 * 760 = 1710 mm HG
Answer:
[tex]\huge\boxed{\sf 2.25\ atm = 1710\ mm\ of\ Hg}[/tex]
Explanation:
Partial pressure of gas A = 0.75 atm
Partial pressure of gas B = 0.25 atm
Partial pressure of gas C = 1.25 atm
Total partial pressure = 0.75 atm + 0.25 atm + 1.25 atm
= 2.25 atm
We know that:
1 atm = 760 mm of Hg
Multiply 2.25 to both sides
2.25 atm = 760 × 2.25 mm of Hg
2.25 atm = 1710 mm of Hg
[tex]\rule[225]{225}{2}[/tex]
alloy is combined by physically or chemically
Answer:
alloy is the homogeneous mixture of metal and metal or metal and non metal
Answer:
Yes, an alloy is combined physically or chemically into a separate compound. And a mixture of
Explanation:
Alloys have physical properties between those constituent metals and chemical properties remain unaffected. But alloys can be separated physically.
particles in the liquid state have _________ IM attractive forces than in the gas state
Answer:
Particles in the liquid state have greater IM attractive forces than in the gas state.
If the oh- of a solution is 2.7x10-4m the poh of the solution is
Answer:
i dont knoe but yea just on here
Explanation:n:
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Describe how you might prepare disodium phosphate given a solution of phosphoric acid, 0.500 molar and a solution of sodium hydroxide base, 0.500molar.
Explanation:
When 2 moles of sodium hydroxide (NaOH) reacts with 1 mole of phosphoric acid (H3PO4) it gives 1 moles disodium phosphate Na2HPO4 and 2 moles of water.
0.5 molar solution indicates half moles of molecules are present in per ltr solution.
to prepare disodium phosphate you need to dilute phosphoric acid solution to 0.25 molar and add equal quantity of 0.5 molar solution.
[tex]2 NaOH + H_3PO_4 \: \rightarrow \: Na_2HPO_4 + 2 H_2O[/tex]
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Which type of reaction is shown?
(1 point)
Fission is shown because mass is being converted into energy as nuclei combine
Fission is shown because nuclei are being split into smaller and smaller places
Fusion is shown because mass is being converted into onergy as nuclei combine
Fusion is shown because nuclei are being split into smaller and smaller places,
According to the image in this question, the type of reaction shown is that of fission because nuclei are being split into smaller and smaller places.
What is nuclear fission?Nuclear fission in radioactivity is the process whereby the nuclei of atoms split into smaller particles.
In the above diagram, an atom of uranium is labeled and its nucleus is shown to split into smaller particles in succession.
Therefore, the reaction exemplifies a nuclear fission because nuclei are being split into smaller and smaller places.
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HCl(?) + H2O(?) → H3O+(?) + Cl-(?)
What is the phase label for H2O?
Group of answer choices
ℓ
Answer:
Transcribed image text: Answer.
the following question for the mixing of gaseous hydrogen chloride with water to make hydrochloric acid. HCl) + H2O(2) → H30*) + Cl (2) What is the phase label on HCI? aq
In chemistry and biology, hydrolysis refers to a twofold decomposition reaction in which water participates.
The conjugate base in HCl H2O H3O+ Cl is what?HCl's conjugate base is Cl in the reaction HCl+H2O+H3O++.
An acidic solution is created when hydrogen chloride gas and water interact. The reaction's equation is displayed. Cl - + H3O + HCl + H2O
Hydroxide ion is base 2, and its conjugate acid (water) is acid1. Acid1 is HCl, and its conjugate base is base1.
The conjugate base of hydrochloric acid is the chloride ion. The hydroxide ion's conjugate acid is water
H3 O+1 is the conjugate acid of H2 O. The electrical charge on water increases by one when one hydrogen ion is added. Hydrogen is also known as H3 O+1.
In a reversible chemical reaction, H 2O and HCl join upon contact to create hydronium cations [H 3O] + and chloride anions Cl : HCl + H 2O [H 3O] + + Cl. The resulting mixture is a potent acid known as hydrochloric acid.
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what is galvanization
need help with this ty
Answer:
The correct answer to first question is C
I only know this one.
Explanation:
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I also kno wtge answer to question 7 is A
21.10g of NaOH and Ba3(OH)2 mixture is dissolved water to prepare 1.0dm³ Solution. To neutralize 25.OO mL of this solution needs 0.5 moldm-³ HCl 15.00mL. calculate the percentage of NaOH by mass in the mixture.
From the equation of te reaction, we know that the mass percent of NaOH in the mixture is 1.4%.
What is neutralization?Neutralization is a reaction that occurs between an acid and a base to yield salt and water only.
In tis case, the reaction of the NaOH and HCl occurs as follows; NaOH + HCl ----> NaCl + H2O
Number of moles of HCl reacted = 15/1000 * 0.5 moldm-³ = 0.0075 moles
Since the reaction is 1:1, 0.0075 moles of NaOH reacted.
Mass of NaOH = 0.0075 moles of NaOH * 40 g/mol = 0.3 g
Percent of NaOH = 0.3 g/21.10g * 100/1 = 1.4%
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Which of these are animal adaptations that help animals live in the deciduous forest biome? Select all that apply.
Round builds
Little feet for snow
Harder outer skin to reduce loss of water
Hibernation
Help fast!
Answer:
Hibernation
Explanation:
deciduous means trees that lose leaves during winter
Science Task (
The transfer of thermal energy by the movement of liquids or gases is called
Convection is the movement of fluid (this can wether be liquid or gas) and as they move, they carry heat along with them.
Answer:
Convection
More info:
Heat transfers include the following: Conduction, Convection, and Radiation.
Conduction is the transfer of heat through molecules by direct contact. This takes place in the three phases of matter, but conduction works best in materials with close contact molecules of simple molecules.Convection, (definition above)Radiation is the transfer of heat through electromagnetic waves. Unlike Conduction and Convection, Radiation doesn't need matter to help with heat transfer.I am open to corrections if I accidentally included false information :).
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