Answer:
1st answer B. Bromine
2nd answer B. magnesium
Explanation:
Hello There!
Which of the following is a non metal that remains liquid at room temperature? "OPTION B"
Chlorophyll is a naturally occurring chelate compound in which central metal is "OPTION B"
Ba(OH)2 = Ba2 + 2OH- (dissolved in solution). Which will not happen to the equilibrium of this solution as H+ ions are added?
H+ will combine with OH- to form water
The base will dissociate to form more OH-
The reaction will move to the right
The reaction will move to the left
The quantity of Ba(OH)2 will decrease
Answer:
The reaction will move to the left.
Explanation:
For the reaction:Ba(OH)₂ = Ba²⁺ + 2OH⁻,
Ba(OH)₂ is dissociated to Ba²⁺ and 2OH⁻.
If H⁺ ions are added to the equilibrium:
H⁺ will combine with OH⁻ to form water.
So, the concentration of OH⁻ will decrease and the equilibrium is disturbed.
According to Le Châtelier's principle: when there is an dynamic equilibrium, and this equilibrium is disturbed by an external factor, the equilibrium will be shifted in the direction that can cancel the effect of the external factor to reattain the equilibrium.
So, the reaction will move to the right to suppress the effect of decreasing OH⁻ concentration.The base will dissociate to form more OH⁻ and thus, the quantity of Ba(OH)₂ will decrease.
So, the right choice is: the reaction will move to the left, is the choice that will not happen to the equilibrium.
Final answer:
Adding H+ ions to a solution of Ba(OH)₂ shifts the equilibrium to the left, reducing the dissociation of Ba(OH)₂ and forming water by combining H₊ and OH₋ ions. The increase in H₊ leads to an increase in Ba(OH)₂ concentration as OH₋ ions are consumed.
Explanation:
When an acid is added to a solution of Ba(OH)₂, which is barium hydroxide, equilibrium dynamics according to Le Chatelier's principle tell us that the H₊ ions will react with OH₋ ions to form water. This reaction will cause the equilibrium of the solution to shift. Specifically, the ionization of Ba(OH)₂ which is represented by the reaction Ba(OH)₂ ⇒ Ba₂₊ + 2OH₋, will move towards the left to decrease the concentration of OH₋ ions that combine with incoming H₊ ions.
The reaction that will not happen is the dissociation of more Ba(OH)₂ to form additional OH₋ ions, because of the presence of excess H₊ ions that drive the equilibrium leftwards. The quantity of Ba(OH)₂ will increase at the expense of OH₋ ions, as they are consumed to form water.
what is enthalpy? ?????????????????????????
A thermodynamic quantity equivalent to the total heat content of a system
Answer:
a thermodynamic quantity to the total heat content of a system. it is equal to the internal energy of the system plus the product of pressure and volume. it is associated with a particular chemical process
Explanation:
i just looked up the definition.
6.5 moles of Al (aluminum) reacts with 7.2 moles of H2O (water). Which is the limiting reactant? Calculate the theoretical yield. Balance equation : 2Al + 3 H2O == Al2O3 + 3H2
Answer:
1. The limiting reactant is H₂O.
2. The theoretical yield of Al₂O₃ = 978.8 g.
Explanation:
1. Which is the limiting reactant?
The balanced equation for the mentioned reaction is:2Al + 3H₂O → Al₂O₃ + 3H₂,
It is clear that 2.0 moles of Al react with 3.0 moles of H₂O to produce 1.0 moles of Al₂O₃ and 3.0 mole of H₂.
From stichiometry; Al reacts with H₂O with (2: 3) molar ratio.∴ 4.8 mol of Al (the remaining 1.7 mol is in excess) reacts completely with 7.2 mol of H₂O with (2: 3) molar ratio.
So,the limiting reactant is H₂O and the excess reactant is Al.
2. Calculate the theoretical yield.
To calculate the theoretical yield, we should get the no. of moles of produced Al₂O₃:Using cross multiplication:
2.0 moles of Al produce → 1.0 moles of Al₂O₃.
4.8 moles of Al produce → ??? moles of Al₂O₃.
∴ The no. of moles of Al₂O₃ produced = (1.0 mol)(4.8 mol)/(2.0 mol) = 9.6 mol.
∴ The theoretical yield of Al₂O₃ = (no. of moles)(molar mass) = (9.6 mol)(101.96 g/mol) = 978.8 g.
How much force is required to lift a rock a vertical distance of 8 m if 80 j of work were done
Answer:-
Try this formula:
W= Fd
F = W by d
Explanation:-
(Note: A newton-meter is the same thing as a joule, so the units for work are the same as those for energy – joules).
The force required to lift a rock at a vertical distance of 8 m if 80 j of work were done is 10 N.
What is force?A force is an effect that can alter an object's motion. Due to force, an object with mass can change its velocity, or accelerate.
Given,
Distance is 8 m
work done is 80 j
Now by the formula of work
[tex]\bold{Work = force \times distance}[/tex]
[tex]80= F\times 8\\\\F= \dfrac{80}{8} = 10 N[/tex]
Thus, the force required is 10 N.
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6. 100 ml of gaseous hydrocarbon consumes 300
ml of oxygen for the complete combustion.
The hydrocarbon is
[MOE 2060]
a. C2H4
b. C2H2
с. С3Н8
d. C2H6
Answer:
a. C₂H₄Explanation:
At constant pressure and temperature, the mole ratio of the gases is equal to their volume ratio (a consequence of Avogadro's law).
Hence, the complete combustion reaction that has a ratio of 100 ml of gaseous hydrocarbon to 300 ml of oxygen, is that whose mole ratio is 1 mol hydrocarbon : 3 mol of oxygen.
Then, you must write the balanced chemical equations for the complete combustion of the four hydrocarbons in the list of choices, and conclude which has such mole ratio (1 mol hydrocarbon : 3 mol oxygen).
A complete combustion reaction of a hydrocarbon is the reaction with oxygen that produces CO₂ and H₂O, along with the release of heat and light.
a. C₂H₄:
C₂H₄ (g) + 3O₂ (g) → 2CO₂(g) + 2H₂O (g)Precisely, for this reaction the mole ratio is 1 mol C₂H₄: 2 mol O₂, hence, this is the right choice.
The following analysis just shows that the other options are not right.
b. C₂H₂:
2C₂H₂ (g) + 5O₂ (g) → 4CO₂(g) + 2H₂O (g)The mole ratio for this reaction is 2 mol C₂H₂ :5 mol O₂.
с. С₃Н₈
C₃H₈ (g) + 5O₂ (g) → 3CO₂(g) + 4H₂O (g)The mole ratio is 1 mol C₃H₈ : 5 mol O₂
d. C₂H₆
2C₂H₆ (g) +7 O₂ (g) → 4CO₂(g) + 6H₂O (g)The mole ratio is 2 mol C₂H₆ : 7 mol O₂
Can someone help me a will really appreciated. I need help fast i need someone to answer all the questions. You get 10 points
Answer:
1. Theory
2. evidence
3. theory
4. Today, natural sciences are more commonly divided into life sciences, such as botany and zoology; and physical sciences, which include physics, chemistry, geology, astronomy, and materials science.
5.In everyday language a theory means a hunch or speculation. Not so in science. In science, the word theory refers to a comprehensive explanation of an important feature of nature supported by facts gathered over time. Theories also allow scientists to make predictions about as yet unobserved phenomena".
7.Empirical evidence is information acquired by observation or experimentation. Scientists record and analyze this data. The process is a central part of the scientific method
8. Field research is a research conducted in the real world or a natural setting. It tends to observe, analyze, and describe what exists rather than manipulating a factor under study .On the other hand, controlled laboratory research is a research conducted in a setting specifically designed for research
10.You would say Scientific knowledge is always being changed and performed in different ways. Scientific knowledge is always being changed as scientist are experiencing and collecting new information everyday using the scientific method.
6.In general, a scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. The explanation of a phenomenon is called a scientific theory. It is a misconception that theories turn into laws with enough research.
The Lewis dot notation for two atoms is shown.
Na is written with a dot on its right. Cl is written on the right of Na. There are seven dots around Cl. An arrow points from the dot near Na to Cl.
What is represented by this notation?
Explanation:
Atomic number of sodium is 11 and its electronic distribution is 2, 8, 1. So, it means there is only one valence electron present in a sodium atom. This valence electron is represented by a dot in the Lewis structure.
Atomic number of chlorine is 17 and its electronic distribution is 2, 8, 7. So, it means there are seven valence electrons present in a chlorine atom. These valence electrons are represented by seven dots in the Lewis structure.
Also, in order to attain stability sodium will lose one valence electron and this valence electron will be gained by chlorine atom.
Therefore, an arrow pointed from dot near Na to Cl shows that an electron is being donated from Na to the Cl atom.
what is the sweetened tea mixture called
Answer:
The sweetened tea mixture is called homogeneous.
The sweetened tea mixture is a homogeneous mixture unlike the heterogeneous mixture which has 2 phases.
What are heterogeneous mixture?Heterogeneous mixtures is defined as a type of mixture where the composition is not uniform throughout the mixture.It consists as two or more phases. The phases are chemically distinct and separate from each other.
As there are two or more phases present in heterogeneous mixtures they can be separated by solvent extraction method where in one phase is miscible with the solvent while the other phase is immiscible.
Components of a heterogeneous mixtures are distinctly visible . There are two types of heterogeneous mixtures, the colloids and the suspensions.These two differ with each other with respect to particle size.It consists of 2 or more phases.
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the movement of water from ocean through the atmosphere and back
Answer:
Water cycle
Explanation:
The water from the ocean and sea evaporates into the atmosphere and goes into the sky to form clouds.
This turns the liquid water into water vapor in the atmosphere. Plants, too, help water get into the atmosphere through a process called transpiration! After absorbing water from the ground, plants “sweat” water vapor through their leaves to stay cool. Water can also get into the atmosphere from snow and ice.
The universal force that exists detween any objects with mass is called?
Answer:
Gravity
Everything with mass has gravity
How much heat is absorbed by 15.5g of steam to turn into liquid water when its temperature is decreased from 120.0°C to 100.0°C?
Answer:
- 618.8 J.
Explanation:
To solve this problem, we can use the relation:Q = m.c.ΔT,
where, Q is the amount of heat released by steam (Q = ??? J).
m is the mass of the steam (m = 15.5 g).
c is the specific heat of the steam (c of steam = 1.996 J/g.°C).
ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = 100.0°C - 120.0°C = - 20.0°C).
∴ Q = m.c.ΔT = (15.5 g)(1.996 J/g.°C)(- 20.0°C) = - 618.8 J.
E. The element 231/90Th decays to 231/91 Pa. Use the laws of conservation of charge and nucleon number to determine the decay particle emitted. Explain your reasoning.
Answer:
A negatron emission
Explanation:
We know that radioactivity orginates from instability of the nucleus. When the nucleus is unstable, radioactive emissions are produced in the form of any of these rays:
> Alpha particle emisson
>Beta particles
> Gamma rays
These emissions create a balance for a radioactive decay.
In balancing nuclear reactions we make sure that the charges on both sides must be conserved and that the mass number and atomic numbers conserved too. This means that the sum of mass number and atomic numbers on both side of the reaction must be equal.
The nucleons are the protons and neutrons, they add up to give the mass number. The atomic number is the proton number.
For the given radioactive reaction:
²³¹₉₀Th → ²³¹₉₁Pa + ?
From this equation, we see that the mass number is conserved but the atomic number is not.
The mass number is the superscript whereas the atomic number is the subscript.
Let's say the decay produces an emission of a particle denoted by X
²³¹₉₀Th → ²³¹₉₁Pa + ᵃₙX
What would the nature of X be?
For the charges and masses to be conserved, X must have mass number of 0 and an atomic number of -1.
Checking:
Mass number:
231 = 231 + a ( a is the mass number)
a = 231 - 231 = 0
Atomic number:
90 = 91 + n
n = 90- 91 = - 1
With X having a mass number of 0 and an atomic number of -1, we have a beta particle emission. Specifically, a negatron has been emitted.
A negatron is denoted as ⁰₋₁β which perfectly makes the equation conserved and suits the description of X.
The complete equation is thus written as:
²³¹₉₀Th → ²³¹₉₁Pa + ⁰₋₁β + energy
In the decay of thorium-231 to protactinium-231, a neutron inside the thorium nucleus converts to a proton, resulting in the emission of a beta particle to conserve charge and nucleon number.
The decay of the element thorium-231 (231/90Th) to protactinium-231 (231/91Pa) involves the emission of a decay particle. According to the laws of conservation of charge and nucleon number, we can determine the type of decay and the particle emitted by examining the change in atomic and mass numbers.
231/90Th decays to 231/91Pa which indicates that the mass number has not changed (indicating the total number of protons and neutrons remains constant) but the atomic number has increased by one. This suggests that a neutron has transformed into a proton and the particle emitted must account for the negative charge to conserve the total charge. Since a neutron (n) converting to a proton (p) emits a beta-minus particle ({{e}}) (an electron), which has a negative charge, the decay particle is therefore identified as a beta particle.
how many molecules are in 3.6 grams of NaCl?
To find the number of molecules in 3.6 grams of NaCl, convert the grams to moles of NaCl using its molar mass and then multiply the number of moles by Avogadro's number (6.02 x 10^23). The result is approximately 3.7 x 10^22 molecules.
Explanation:To find out how many molecules are in 3.6 grams of NaCl, first calculate the number of moles of NaCl. Each mole of NaCl has a mass of 58.44 grams (sum of atomic masses of Na and Cl). So, 3.6 grams corresponds to 3.6/58.44 = 0.0616 moles.
Now, use the Avogadro's number which states that one mole of any substance contains 6.02 x 10^23 molecules. So, 0.0616 moles of NaCl would contain approximately 0.0616 x 6.02 x 10^23 = 3.7 x 10^22 molecules.
In conclusion, the number of molecules in 3.6 grams of NaCl is approximately 3.7 x 10^22.
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To find the number of molecules in 3.6 grams of NaCl, first calculate the number of moles (0.0615 moles), then convert this to molecules using Avogadro's number, resulting in approximately 3.70 x 10²² molecules.
To determine the number of molecules in 3.6 grams of NaCl, follow these steps:
Calculate the molar mass of NaCl: The molar mass of NaCl is the sum of the atomic masses of sodium (Na) and chlorine (Cl). Thus, the molar mass of NaCl is 23.0 g/mol (Na) + 35.5 g/mol (Cl) = 58.5 g/mol.Find the number of moles in 3.6 grams of NaCl: Use the formula: number of moles = given mass / molar mass.Number of moles of NaCl = 3.6 g / 58.5 g/mol ≈ 0.0615 moles
Convert moles to molecules: Use Avogadro's number, which is 6.022 x 10²³ molecules per mole.Number of molecules = 0.0615 moles x 6.022 x 10²² molecules/mole ≈ 3.70 x 10²² molecules
Therefore, there are approximately 3.70 x 10²² molecules in 3.6 grams of NaCl.
HELP ASAP! GIVING BRAINLIEST!!
How could you give a pendulum more energy?
Answer: By pushing it.
Explanation: If you push the pendulum, the energy from your hand to the pendulum will be transferred thus giving the pendulum more energy.
Why does warm soda go flat faster than chilled soda?
Hello There!
The moloques are moving faster in warm soda, so the carbonation leaves the soda faster.
Answer:
Same as what BlueFox stated above EXCEPT it is gas molecules move faster in warm soda
Explanation:
making fun of his typo,,,
Geiger counters and scintillation counters differ in
Blank .
The Geiger Counter. Geiger counters are used to detect radioactive emissions, most commonly beta particles and gamma rays. The counter consists of a tube filled with an inert gas that becomes conductive of electricity when it is impacted by a high-energy particle.
Hope That Helps!!!
NOTE:Mark as BRAINLIEST!!!!!
Answer:
Geiger counters can detect all kinds of radiation, while scintillation counters can only detect ionizin radiation
The salt formed from the Acid/ Base reaction between HBr and NaOH is called
The salt formed from the reaction between HBr and NaOH is sodium bromide (NaBr), which is the result of a neutralization reaction involving the combination of hydroxide ions from the base with hydrogen ions from the acid, and the combination of sodium ions from the base with bromide ions from the acid.
The salt formed from the acid/base reaction between HBr (hydrobromic acid) and NaOH (sodium hydroxide) is called sodium bromide (NaBr). When these two reactants combine in a neutralization reaction, the hydroxide ions (OH⁻) from the base react with the hydrogen ions (H⁺) from the acid to produce water (H₂O), and the remaining sodium ions (Na⁺) from the base combine with the bromide ions (Br⁻) from the acid to form the salt sodium bromide (NaBr).
This can be represented by the chemical equation:
NaOH (aq) + HBr (aq) rightarrow NaBr (aq) + H2O (l)
A salt is generally an ionic compound made up of the cation from a base and the anion from an acid. As HBr is a strong acid and NaOH is a strong base, the resulting sodium bromide solution has a neutral pH, similar to sodium chloride (NaCl).
Which of the following is the correct formula for nitrogen trifluoride
Answer:NF3 is the correct formula for nitrogen trifluoride.
Explanation:
In the given question, the correct formula for nitrogen trifluoride is [tex]\rm NF_3[/tex].
Nitrogen trifluoride is a covalent compound that is composed of one nitrogen atom and three fluorine atoms.
The nitrogen atom shares one of its valence electrons with each of the three fluorine atoms to form three single covalent bonds. The resulting molecule has a trigonal pyramidal shape, with the nitrogen atom at the center and the three fluorine atoms arranged around it.
The prefix "tri-" in the name of the compound indicates that there are three fluorine atoms in the molecule.
Therefore, [tex]\rm NF_3[/tex] is the correct formula for nitrogen trifluoride.
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Which of the following is a heterogeneous mixture?
Answer: It would be paint.
Explanation: it would be paint because it doesn't come completely together. another example of a heterogeneous mixture could be cereal and milk.
A 5.0 g sample of calcium nitrate (Ca(NO3)2, M = 164) contaminated with silica (SiO2, M = 60.1) is found to contain 1.0 g calcium. What is the mass percent purity of calcium nitrate in the sample?
Answer:
= 82%
Explanation:
Percentage purity is calculated by the formula;
% purity = (mass of pure chemical/total mass of sample) × 100
In this case;
1 mole of Ca(NO3)2 = 164 g
but; 164 g of Ca(NO3)2 = 40 g Ca
Therefore; mass of Ca(NO3)2 = 164 /40
= 4.1 g
Thus;
% purity of Ca(NO3)2 = (Mass of Ca(NO3)2/ mass of the sample)× 100
= (4.1 g/ 5 g) × 100
= 82%
To find the mass percent purity of calcium nitrate in the sample, calculate the equivalent mass of calcium nitrate from the given mass of calcium and then use this to determine the purity percentage, which comes out to be 81.82%.
Explanation:The question asks for the mass percent purity of calcium nitrate in a sample that has been contaminated with silica. It is given that the sample has a total mass of 5.0 g and contains 1.0 g of calcium. Calcium nitrate (Ca(NO₃)₂) has a known molar mass of 164 g/mol. As calcium has a molar mass of 40.08 g/mol, and there is one mole of calcium in one mole of calcium nitrate, the mass of pure calcium nitrate can be calculated by converting the mass of calcium found in the sample to its equivalent mass in calcium nitrate.
First, find the number of moles of calcium in the sample:
moles of Ca = 1.0 g / 40.08 g/mol = 0.024945 moles
The moles of calcium nitrate are equal to the moles of calcium, as there is one calcium atom per molecule of calcium nitrate. Therefore, to find the mass of calcium nitrate:
mass of Ca(NO₃)₂ = 0.024945 moles × 164 g/mol = 4.091 g
The mass percent purity of calcium nitrate can then be calculated:
mass percent purity of Ca(NO₃)₂ = (mass of Ca(NO₃)₂ / total mass of sample) × 100 = (4.091 g / 5.0 g) × 100 = 81.82%
a shampoo bottle contains 553mL of air at 65C what is its volume when it cools to 22C
Answer:
V₂ = 0.483L = 483mL
Explanation:
Given parameters:
Inital volume of air in shampoo bottle V₁ = 553mL
Original temperature of the bottle T₁ = 65°C
Final temperature T₂= 22°C
Final volume of the gas in the bottle V₂=?
We first take the given units into standard units:
K = T°C + 273
For T₁ we have the temperature to be = 65 + 273 = 338K
T₂ = 22 + 273 = 295K
For the volume we convert to Litres or dm³
1000mL = 1L
V₁ = 553 x 10⁻³L = 0.553L
Now apply one of the gas laws to solve this problem.
From Charles law, we know that the volume of fixed mass of gas is directly proportional to its absolute temperature if the pressure is constant.
Charles's law is expressed as:
[tex]\frac{V_{1} }{T_{1} } = \frac{V_{2} }{T_{2} }[/tex]
The unkown in the equation is V₂ we the express it as the subject of the formula :
V₂ = [tex]\frac{V_{1} T_{2} }{T_{1} }[/tex]
Putting the parameters in the equation gives:
V₂ = [tex]\frac{0.553 x 295}{338}[/tex]
V₂ = 0.483L = 483mL
An aerosol is a colloidal suspended in a .
An aerosol is a colloidal suspension in a gas, consisting of small particles or droplets that do not settle due to their small size. Examples include fog and smoke, where the dispersing medium is air. Understanding aerosols is important for their role in atmospheric processes and distinguishing them from other mixtures like solutions and suspensions.
Explanation:
An aerosol is a colloidal suspension in a gas. This means that an aerosol comprises tiny particles or droplets that are suspended within a gas. Unlike a suspension, where the particles can separate out over time due to their size (generally larger than 1 µm), the particles in a colloidal system, like an aerosol, do not settle because they are much smaller and range in size from about 2 to 500 nm. Aerosols can be composed of both solid and liquid particles dispersed in a gas, and these particles are stable enough not to settle quickly under the influence of gravity.
Examples of aerosols include fog, which consists of liquid water droplets dispersed in air, and smoke, which contains solid carbon particles also suspended in air. In both cases, the medium dispersing these particles is a gas (air), highlighting the defining characteristic of aerosols as a type of colloid. The significance of aerosols extends beyond simple examples, as they play integral roles in atmospheric processes, affecting weather, climate, and air quality, by influencing the scattering and absorption of radiation and serving as nuclei for cloud formation.
The ability of colloids, including aerosols, to scatter light, known as the Tyndall effect, further distinguishes them from solutions which are homogeneous mixtures and therefore do not exhibit this phenomenon. It's important to understand the distinction between aerosols and other types of mixtures, such as solutions and suspensions, to appreciate the unique physical and chemical behaviors of colloidal systems.
What are some characteristics of a conductor of metal. Give at least 4 examples
Explanation:
Metals are the substances or elements that contain more number of electrons.
Some of the properties of metals are as follows.
Metals are good conductors of heat and electricity.They have shiny surface, that is, they are lustrous.Metals are malleable that is, they can be drawn into thin sheets.Metals are also ductile in nature that is, they can be drawn into thin wires.The brightness of a star is determined by _____.
distance from the Earth
temperature
color
season
size
The actual answer is size and temperature
All stars are very hot. They resemble a gigantic furnace of atomic energy. Some stars are much hotter than others and appear to be brighter. The brightness of a star also depends upon its size and its distance from the Earth. Larger stars tend to be brighter, but a star closer to the Earth will appear brighter than one the same size that is farther away.
PLEASE GIVE ME BRAINLIEST
Answer:
the correct answer is Size, Temperature, distance from the earth
hope this helps!! <33
The density of glycerin is 1.26 Grams/cm^3. How many lbs/ ft is this? Use the conversion rates of 454g/1 lbs and 28317 cm^3/ 1 ft^3 . Express your answer to the correct number of significant figures. The density is .
The answer is:
The density is equal to:
[tex]78.6\frac{lb}{ft^{3} }[/tex]
Why?This a unit conversion problem, so, converting the density of glycerin from [tex]gram/cm^{3}[/tex] to [tex]\frac{lb}{ft^{3}}[/tex] using the given conversion rates, we have:
[tex]1.26\frac{gram}{cm^{3}}*\frac{1lb}{454gram}*\frac{28317cm^{3} }{1ft^{3} }=78.59\frac{lb}{ft^{3} }[/tex]
Rounding to three significant figures, we have that the density is equal to:
[tex]78.6\frac{lb}{ft^{3} }[/tex]
Have a nice day!
The density is 78.6
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How many grams of AL are needed to completely react with 135g FE2O3
About 45.6 gAL are need to completely react with 135g FE2O3
To determine the mass of Al needed to react with 135 grams of Fe₂O₃, convert the mass of Fe₂O₃ to moles, use the stoichiometric ratio to find moles of Al needed, and then convert those moles to grams of Al to three significant figures.
The question is asking how many grams of aluminum (Al) are needed to completely react with 135 grams of iron(III) oxide (Fe2O3). This is a stoichiometry problem that requires using the balanced chemical equation:
Fe₂O₃(s) + 2Al(s) →2Fe(s) + Al₂O₃(s)
We start by converting the mass of Fe₂O₃ to moles using its molar mass:
1.0g Fe₂O₃ / 159.7 g/mol = moles of Fe₂O₃
Then we use the mole ratio from the balanced equation to convert from moles of Fe₂O₃ to moles of Al. The molar mass of Al is 27.0 g/mol. Finally, we convert moles of Al to grams using its molar mass to find the mass of Al needed for the reaction.
With the provided mass of 135g of Fe₂O₃, and the reaction stoichiometry, we can determine the mass of Al required which will be expressed to three significant figures.
What is the pH of a solution that has a hydroxide ion concentration of 1.0×10−9 M?
Answer:
[tex]\boxed{\text{pH = 5.00}}[/tex]
Explanation:
Step 1. Calculate the pOH
pOH =-log[OH⁻]
pOH =-log(1.0 × 10⁻⁹)
pOH = 9.00
Step 2. Calculate the pH
pH + pOH = 14.00
pH + 9.00 = 14.00
[tex]\boxed{\textbf{pH = 5.00}}[/tex]
Final answer:
The pH of a solution with a hydroxide ion concentration of 1.0 × 10⁻⁹ M is 5, indicating the solution is acidic.
Explanation:
To calculate the pH of a solution with a known hydroxide ion concentration, we can use the relationship between the concentration of hydroxide ions ([OH-]) and hydrogen ions ([H+]), which is given by the ionic product of water (Kw = 1.0 × 10⁻¹⁴ at 25°C). The pH is defined as the negative logarithm of the hydrogen ion concentration, pH = -log([H+]).
Since we have the hydroxide ion concentration ([OH-] = 1.0 × 10⁻⁹ M) we can find the hydrogen ion concentration from Kw:
Kw = [H+] × [OH-]
[H+] = Kw / [OH-]
[H+] = (1.0 × 10⁻¹⁴ M2) / (1.0 × 10⁻⁹ M)
[H+] = 1.0 × 10-5 M
Now we can calculate the pH:
pH = -log([H+])
pH = -log(1.0 × 10⁻⁵)
pH = 5
A pH of 5 indicates that the solution is acidic, as a pH less than 7 is characteristic of an acidic solution.
Explain the difference between ecosystem, community, and population.
Out of the three you gave ecosystem is what I would call the most broad. An ecosystem includes living AND non-living things in an area
Community is all the LIVING things in an area (plants are included and I think bacteria is too, but I'm not sure)
Population is pretty narrow it just looks at specific species in one area. Population of mosquitoes doesn't include butterflies, if only looks at mosquitoes
Hope this helped!
explain what happens in a nuclear chain reaction
Answer:
Nuclear Chain Reactions. A chain reaction refers to a process in which neutrons released in fission produce an additional fission in at least one further nucleus. This nucleus in turn produces neutrons, and the process repeats. The process may be controlled (nuclear power) or uncontrolled (nuclear weapons).
Explanation:
A nuclear chain reaction occurs when an initial reaction causes more reactions, generating recurring secondary reactions, forming a self-sustaining chain, much like a domino effect. This process is common in nuclear fission and fusion.
Explanation:In a nuclear chain reaction, an initial reaction causes excess neutrons to be emitted. These neutrons then cause other similar nuclear reactions, generating more neutrons and thus, more nuclear reactions. This sequence forms a self-sustaining chain. This is common in both nuclear fission, as seen in nuclear power plants and atomic bombs, or in a controlled manner in nuclear fusion, as is being researched for future clean energy solutions. It's like a domino effect but with atomic nuclei and neutrons.
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Which statement correctly describes measuring with a graduated cylinder?
Answer:
what are the options because a graduated cylinder is a science mixing cylinder is a common piece of laboratory equipment used to measure the volume of a liquid
Explanation: