Answer:
Here we were given the weight of Ca as 80g
and the atomic mass of carbon is 40u(molar mass)
using the formula
n=W/Mwhere w is weight and m is molar mass
80/40
=2
therefore, there are 2 moles in 80g of calcium
5 Facts about cell division
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A 35 kg child is standing in a 70 kg boat resting on the water. The child jumps forward, away from the boat, pushing with a force of 500 N. After the jump, the boat moves backward.
What does this scenario show?
A. The boat does not exert a force to balance the 500 N force, causing the boat to move.
B. The water creates a frictionless surface, causing the boat to move without an action force.
C. The boat has a greater mass than the child but reacts to an action force.
D. The water beneath the boat absorbs the 500 N force but keeps the boat afloat.
Answer:
A
Explanation:
the boat does not have a force to counter act the boys it must give which means it moves cause it is one something that is not as dense as the boy (I THINK)
3. A cub has the following measurements: I=0.045 m, w=
0.45dm, 4.5 mm. It's mass is 1.45 X 104 mg. What is this
cube's density in Kg/cm?
Answer:
Density of cube = 1.59 × 10-⁴ kg/cm³
Explanation:
From the question, the dimensions of the cube are as follows:
Iength, l =0 .045 m, width, w = 0.45dm, height, h = 4.5 mm.
It's mass is 1.45 X 104 mg. What is this cube's density in Kg/cm?
First, all units of length are converted to cm and mass is converted to Kg.
L = 0.045 m = 0.045 m × 100 cm/m = 4.5 cm;
W = 0.45 dm = 0.45 dm × 10 cm/dm = 4.5 cm
Since it is a cube, the height, h = 4.5 cm not 4.5 mm
Mass of cube = 1.45 × 10⁴ mg = 1.45 × 10⁴ mg × 1 × 10-⁶ kg/mg = 0.0145 kg
Density = mass/volume
Volume of cube = s³ or l × w × h
Volume of cube = 4.5 cm × 4.5 cm × 4.5 cm = 91.125 cm³
Density of cube = 0.0145 kg / 91.125 cm³
Density of cube = 1.59 × 10-⁴ kg/cm³
What is so important about DNA? Select all correct answers.
A. DNA is found in all organisms and carries instructions to build those organisms
B. DNA found in one organism probably shares similar instructions found in another species
C. DNA is composed of only four bases that repeat in a sequence that is different for each
species
D. Some organisms don't actually have DNA
E. The DNA of each organism is made out of different types of chemicals
Answer:
A and C
Explanation:
DNA is what makes up you and me and DNA is composed of four bases adenine, guanine, thymine, and cytosine. The others are not true.
Which of the following statements are true about a strong base and a weak base at a pH of 11?
A. The weak base will require less HCl to bring the pH to 7 than the strong base.
B. The strong base will require less HCl to bring the pH to 7 than the weak base.
C. Both bases require the same amount of HCl to reach pH 7 because they are both at the same initial pH.
D. HCl will not bring the pH of either solution to pH 7.
Answer:
A, C, D
Explanation:
what is velocity measured in?
Answer:
units of length per time
Explanation:
Groups of atoms repeat to make up a substance?
True
False
Answer:
ITS TRUE!!!!!
Use the Ksp values in section 4.2 to calculate the pH at which a precipitate of iron(III) hydroxide will begin to dissolve. Assume that the concentration of iron in the solution is 0.1 M. b. Describe how you could use pH control to separate lead and iron if they were both precipitated as their hydroxides. Hint: How could pH be used to dissolve one of the hydroxide precipitates but not the other?
To selectively dissolve iron(III) hydroxide while leaving lead(II) hydroxide unaffected, pH control is used by adjusting the solution to be more basic, exploiting the difference in solubility behavior of the two hydroxides at different pH levels.
To calculate the pH at which a precipitate of iron(III) hydroxide will begin to dissolve, we need to use the solubility product constant (Ksp) for iron(III) hydroxide[tex](Fe(OH)_{3} )[/tex] and the concentration of iron in the solution.
b. To separate lead and iron if they were both precipitated as their hydroxides, pH control can be employed. By adjusting the pH, one of the hydroxide precipitates can be selectively dissolved while the other remains insoluble.
The solubility of a metal hydroxide is typically dependent on the pH of the solution due to the formation of hydroxide complexes or the presence of competing species.
For example, lead(II) hydroxide [tex](Pb(OH)_{2} )[/tex]has low solubility in neutral or slightly basic conditions, while iron(III) hydroxide[tex](Fe(OH)_{3} )[/tex]is more soluble at higher pH values.
Therefore, if both lead and iron hydroxide precipitates are formed, adjusting the pH to be more basic will selectively dissolve the iron(III) hydroxide precipitate while leaving the lead(II) hydroxide precipitate relatively unaffected.
This separation can be achieved by adding a basic solution, such as sodium hydroxide (NaOH), to increase the pH. The lead(II) hydroxide will remain insoluble while the iron(III) hydroxide will dissolve into solution due to the formation of soluble hydroxide complexes.
By carefully controlling the pH, the two metal hydroxide precipitates can be separated.
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There are 4 mg of lead present in 2000 g of a water sample. What is the
concentration of lead in m?
Answer: 130 ppm Pb
Explanation:
We use parts per million to express the concentrations of solutions that contain very, very small amounts, often called trace amounts, of a given solute.
More specifically, a solution's concentration in parts per millions tells you the number of parts of solute present for every
10
6
=
1
,
000
,
000
parts of solution. You can thus say that a
1 ppm
solution will contain exactly
1 g
of solute for every
10
6
g
of solution.
In your case, you know that you have
38
mg Pb
⋅
1 g
10
3
mg
=
3.8
⋅
10
−
2
.
g Pb
in exactly
300.0 g
=
3.000
⋅
10
2
.
g solution
This means that you can use this known composition as a conversion factor to scale up the mass of the solution to
10
6
g
10
6
g solution
⋅
3.8
⋅
10
−
2
.
g Pb
3.000
⋅
10
2
g solution
=
130 g Pb
Since this represents the mass of lead present in exactly
10
6
g
of solution, you can say that the solution has a concentration of
concentration
ppm
=
130 ppm Pb
−−−−−−−−−−−−−−−−−−−−−−−−−−−−
The answer is rounded to two sig figs, the number of sig figs you have for the mass of lead present in the sample.
How many moles are in 1.3 x1023 atoms of He?
Answer:
he ans she and he and she but she was he so how was he
Explanation:
The chemical equation below is correctly balanced.
4 Al + 3 O2 → 2 Al2O3
How many moles of Al2O3 will be formed when 27 grams of Al reacts completely with O2?
Answer:
0.35moles
Explanation:
when 156g of Al reacts with 2molesof Al2O3 then 27g of Al reacts with what then u cross multiply and solve ur answer
0.35moles of Al[tex]_2[/tex]O[tex]_3[/tex] will be formed when 27 grams of Al reacts completely with O[tex]_2[/tex]. A mole consists of precisely 6.022× 10²³particles.
What is mole?A mole is just a measuring scale. In reality, it's one of the International System of Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. The levels at which chemical reactions frequently occur exclude the use of grams, yet utilizing actual numbers of atoms, molecules, or ions would also be unclear.
A mole consists of precisely 6.022× 10²³particles. The "particles" might be anything, from tiny things like electrons and atoms to enormous things like stars or elephants.
4 Al + 3 O[tex]_2[/tex] → 2 Al[tex]_2[/tex]O[tex]_3[/tex]
moles of aluminium = 27 /26=1.03moles
The mole ratio between Al and Al[tex]_2[/tex]O[tex]_3[/tex] is 2:1
mole of Al[tex]_2[/tex]O[tex]_3[/tex]= 0.35moles
Therefore, 0.35moles of Al[tex]_2[/tex]O[tex]_3[/tex] will be formed when 27 grams of Al reacts completely with O[tex]_2[/tex].
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A large doublet and a small septet pattern in ¹H NMR is usually indicative of a(n)
A. ethyl group.
B. propyl group.
C. isopropyl group.
D. phenyl group.
The answer is B. propyl group.A large doublet and a small septet pattern in ¹H NMR spectroscopy indicate the presence of a propyl group in the molecule being analyzed.
In ¹H NMR (proton nuclear magnetic resonance) spectroscopy, the number and arrangement of signals in the spectrum provide information about the chemical environment and connectivity of hydrogen atoms in a molecule. A large doublet and a small septet pattern in ¹H NMR is characteristic of a propyl group.
A propyl group consists of three carbon atoms connected in a chain, with a hydrogen atom attached to each carbon atom. The large doublet arises from the neighboring hydrogens (vicinal protons) on the middle carbon atom, which split the signal into two peaks of equal intensity. The small septet arises from the hydrogens on the two terminal carbon atoms, which split the signal into seven peaks with intensity ratios of 1:6:6:6:6:6:1.
An ethyl group (A) consists of two carbon atoms and does not exhibit a septet pattern. An isopropyl group (C) consists of three carbon atoms but has a different arrangement of hydrogens, leading to a different splitting pattern in the NMR spectrum. A phenyl group (D) is an aromatic ring and typically exhibits different patterns in the NMR spectrum.
A large doublet and a small septet pattern in ¹H NMR spectroscopy indicate the presence of a propyl group in the molecule being analyzed. This pattern arises from the chemical shifts and splitting of hydrogens within the propyl group's carbon chain.
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Continental mountain ranges are usually associated with
true/false. tetraphosphorus (p4), commonly known as white phosphorus, forms different compounds with chlorine (cl2) depending on the amount of chlorine present. if chlorine is limited, phosphorus trichloride
True. Tetraphosphorus (P4), commonly known as white phosphorus, can form different compounds with chlorine (Cl2) depending on the amount of chlorine present. When chlorine is limited, it forms phosphorus trichloride (PCl3).
White phosphorus, or tetraphosphorus (P4), is a highly reactive and toxic allotrope of phosphorus. When it reacts with chlorine, it can form various compounds. In the case where chlorine is limited or not in excess, the reaction between P4 and Cl2 leads to the formation of phosphorus trichloride (PCl3). Phosphorus trichloride is a colorless and volatile liquid compound that is used in various chemical processes and as a reagent in organic synthesis. It is important to note that in excess chlorine, different compounds such as phosphorus pentachloride (PCl5) can be formed.
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hello my BEANS i want to know if u r a girl or a boy so if i call u a boy and u r a girl i am not a bad person i am 13 and i am good and not a robot pls dont repot me pls
Answer:
okie
Explanation:
imma girl
Benadryl, C17H21NO, is an over-the-counter drug used to treat allergy symptoms. If each dose of Benadryl contains 5.89 x 10^19molecules of Benadryl, how many moles is this equal to?
Answer:
9.78x10^(-5) mol
Explanation:
To convert molecules to moles, divide the # of molecules by 6.02x10^23.
5.89x10^19 / 6.02x10^23 = 9.78x10^(-5) mol
Au + FeSO4= ?????????
Answer:
what
Explanation:
the half-life of plutonium-239 is 24,300 years. if a nuclear bomb released 8 kg of this isotope, how many grams of plutonium-239 would be left after 72,900 years?
To calculate the amount of plutonium-239 remaining after 72,900 years, we need to determine the number of half-lives that have passed. Given that the half-life of plutonium-239 is 24,300 years and 8 kg of this isotope was initially released, we can use the half-life formula to find the answer.
The number of half-lives can be calculated by dividing the total time elapsed (72,900 years) by the half-life of the isotope (24,300 years). In this case, the number of half-lives would be 72,900 years / 24,300 years = 3 half-lives. The remaining amount of plutonium-239 can be calculated by multiplying the initial amount (8 kg) by (1/2) raised to the power of the number of half-lives. Each half-life reduces the amount of plutonium-239 to half its previous value.
Remaining amount = initial amount × (1/2)^(number of half-lives)
Remaining amount = 8 kg × (1/2)^3
Remaining amount = 8 kg × (1/8)
Remaining amount = 1 kg
Therefore, after 72,900 years, there would be 1 kg (1000 grams) of plutonium-239 remaining from the initially released 8 kg.
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drive the equilibrium in the reaction mixture towards the product.
To drive the equilibrium in the reaction mixture towards the product, manipulate the reaction conditions and adjust the reaction parameter.
How can the reaction conditions be optimized to favor the product formation?Adjusting reaction conditions to drive the equilibrium towards the desired product. By manipulating various factors such as temperature, pressure, concentration, and catalysts, it is possible to shift the equilibrium in a chemical reaction towards the product side. Altering these parameters can impact the forward and backward reaction rates, ultimately favoring the formation of the desired product.
For example, increasing the temperature may promote an endothermic reaction, while reducing the pressure or adjusting the concentration of reactants can help alleviate the impact of Le Chatelier's principle.
Additionally, introducing a catalyst can provide an alternative reaction pathway with lower activation energy, facilitating the production of the desired product. Understanding these principles and their application allows for strategic control over the equilibrium and the optimization of reaction conditions to maximize product yield.
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what is the unit for particles of titanium iii oxide
a. Ions
b. Atoms
C: molecules
d. Formula units
Answer:
d
Explanation:
if 5.00g nacl (molar mass = 58.44 g/mol) was reacted with 10.0ml of 5m h2so4 what is the limiting reactant in this reaction?
The limiting reactant in the reaction, given that 5.00 g of NaCL reacted with 10.0 mL of 5 M H₂SO₄ is NaCl
How do i determine the limiting reactant?First, we shall obtain the mole of 5.00 g of NaCl. Details below:
Mass of NaCl = 5 grams Molar mass of NaCl = 58.44 g/mol Mole of NaCl =?Mole of NaCl = mass / molar mass
= 5 / 58.44
= 0.09 mole
Next, we shall obtain the mole of 10.0 mL of 5 M H₂SO₄. Details below:
Volume = 10 mL = 10 / 1000 = 0.01 LMolarity = 5 MMole of H₂SO₄ =?Mole of H₂SO₄ = molarity × volume
= 5 × 0.01
= 0.05 mole
Finally, we shall determine the limiting reactant. Details below:
2NaCl + H₂SO₄ -> Na₂SO₄ + 2HCl
From the balanced equation above,
2 moles of NaCl reacted with 1 mole of H₂SO₄
Therefore,
0.09 mole of NaCl will react with = (0.09 × 1) / 2 = 0.045 mole of H₂SO₄
We can see from the above that only 0.045 mole of H₂SO₄ out of 0.05 mole is needed to react completely with 0.09 mole of NaCl.
Thus, we can conclude that the limiting reactant for the reaction is NaCl
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Which of these acid dissociates completely in aqueous solution?
A- Acetic acid
B- Citric acid
C- НСІ
D- Carbonic acid
Answer:
HCl
Explanation:
is a strong acI'd,,By contrast a weak acid like acetic acid (CH3COOH) does not dissociate well in water
calculate the molar solubility of pbi2 in aqueous solution. use the ksp you obtained for this experiment.
The molar concentration of iodide ion (I⁻) in a saturated PbI₂ solution is 3 x 10⁻³ M.
To determine the molar concentration of iodide ion (I⁻) in a saturated PbI₂ solution, we need to consider the stoichiometry of the dissolution reaction of PbI₂ and use the solubility product constant (Ksp) for PbI₂.
The balanced equation for the dissolution of PbI₂ is:
PbI₂(s) ⇌ Pb²⁺(aq) + 2I⁻(aq)
According to the stoichiometry of the balanced equation, every 1 mole of PbI₂ dissociates to produce 2 moles of iodide ions (I⁻). Therefore, the molar concentration of iodide ions can be calculated by multiplying the molar solubility of PbI₂ by 2.
Given that the molar solubility of PbI₂ is 1.5 x 10⁻³ M, the molar concentration of iodide ion in a saturated PbI₂ solution is:
2 x (1.5 x 10⁻³ M) = 3 x 10⁻³ M
Therefore, the molar concentration will be 3 x 10⁻³ M.
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--The given question is incomplete, the complete question is
"The Molar Solubility Of PbI₂ Is 1.5 X 10⁻³ M.A/ What Is The Molar Concentration Of Iodide Ion In A Saturated PbI₂ Solution?"--
A student performed a similar experiment with four hypothetical cations, A, B, C, and D and two hypothetical anions, X and Y. Her data is below: Analyte yellow ppt yellow ppt white ppt clear, colorless solution, NR c* clear, colorless solution, NR clear, colorless solution, NR white ppt blue ppt The student was then provided with an unknown containing one of the anions above. She reacted it with the four hypothetical cations, A, B, C, and D, her results are below: Analyte unknown yellow ppt Which of the following statements is most true with regard to this data? a) More tests would need to be performed to identify the anion in the unknown. b) The unknown anion is most likely Y c) The unknown anion is most likely X
Option (a) is the most true statement based on the provided data, and further testing is needed to identify the specific anion in the unknown solution.
Based on the provided data, the student observed a yellow precipitate when reacting the unknown with the four hypothetical cations A, B, C, and D.
This suggests that the unknown anion is capable of forming a yellow precipitate with these cations. However, without further information or additional tests, it is not possible to definitively conclude the identity of the unknown anion.
Option (a) states that more tests would need to be performed to identify the anion in the unknown. This is the most accurate statement based on the given data. The observed yellow precipitate narrows down the possibilities but does not provide enough information to determine whether the unknown anion is X or Y. Additional tests or data would be required to make a conclusive identification.
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what is the atomic weight of Na?
Answer:
22.989769 u
Explanation:
The atomic weight of any atom can be found by multiplying the abundance of an isotope of an element by the atomic mass of the element and then adding the results together. This equation can be used with elements with two or more isotopes: Carbon-12: 0.9889 x 12.0000 = 11.8668. Carbon-13: 0.0111 x 13.0034 = 0.1443.
Pls no links can someone pls tell me what to put to fill in the blanks please someone?????
Answer: you go down by your key bad and use those arrows
Explanation:
a system does 566 kj of work and loses 246 kj of heat to the surroundings. what is the change in internal energy, δ , of the system? note that internal energy is symbolized as δ in some sources.
The change in internal energy (ΔU) of the system is 320 kJ.
The change in internal energy (ΔU) of a system can be calculated using the first law of thermodynamics, which states that the change in internal energy of a system is equal to the heat added to the system minus the work done by the system:
ΔU = Q - W
where ΔU is the change in internal energy, Q is the heat added to the system, and W is the work done by the system.
In this case, the system does 566 kJ of work (W = -566 kJ) and loses 246 kJ of heat to the surroundings (Q = -246 kJ). The negative sign indicates that the work is done by the system and the heat is lost by the system.
Substituting the values into the equation:
ΔU = -246 kJ - (-566 kJ)
= -246 kJ + 566 kJ
= 320 kJ
Therefore, the change in internal energy (ΔU) of the system is 320 kJ.
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According to the following reaction, how many moles of mercury(II) oxide are necessary to form 0.896 moles oxygen gas? mercury(II) oxide (s) mercury (l) + oxygen (g) ___?___moles mercury(II) oxide
We require 0.896 moles of HgO to produce 0.896 moles of O2.
The balanced chemical equation for the given reaction is;HgO(s) → Hg(l) + O2(g)We can calculate the number of moles of HgO(s) required to produce 0.896 moles of O2(g) using stoichiometry.To use stoichiometry we need to know the mole ratio of O2 to HgO in the above reaction.Based on the balanced chemical equation, the ratio of HgO to O2 is 1:1.This means that 1 mole of HgO will produce 1 mole of O2.Therefore, the number of moles of HgO required to produce 0.896 moles of O2 is also 0.896 moles.150 words explanation:To calculate the number of moles of HgO required to produce 0.896 moles of O2 we can use the mole ratio of the two compounds in the balanced chemical equation.HgO(s) → Hg(l) + O2(g)From the equation, the ratio of HgO to O2 is 1:1. This means that 1 mole of HgO will produce 1 mole of O2.If we have 0.896 moles of O2, we will require the same number of moles of HgO to produce the O2. Therefore, we require 0.896 moles of HgO to produce 0.896 moles of O2.
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imagine that cl- ions exist in higher concentration outside a cell than inside, and that the membrane is only permeable to the cl- ions. which one of the following statements is correct?
If the concentration of chloride ions (Cl-) is higher outside the cell compared to inside, and the membrane is only permeable to Cl- ions, the correct statement would be:
"Cl- ions will move from the higher concentration outside the cell to the lower concentration inside the cell through the membrane until equilibrium is reached."
This movement of ions occurs due to the principle of diffusion. Diffusion is the passive movement of particles from an area of higher concentration to an area of lower concentration. In this case, since the membrane is permeable only to Cl- ions, they will be the only particles involved in this process. As Cl- ions are more concentrated outside the cell, they will move across the membrane, down their concentration gradient, into the cell. This movement will continue until the concentrations of Cl- ions inside and outside the cell become equal, reaching equilibrium. It's important to note that this process does not require the input of energy, as it occurs spontaneously due to the concentration difference. However, the movement of Cl- ions may have implications for the overall electrochemical balance of the cell, potentially affecting other ion concentrations and membrane potential.
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how many moles of c6h12o6 are consumed when 6.0 moles o2 are used
One mole of C₆H₁₂O₆ is consumed when 6.0 moles O₂ are used in the reaction.
The balanced chemical equation for the reaction is: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O
For every 6 moles of oxygen gas consumed, one mole of glucose is consumed. The molar ratio of C₆H₁₂O₆ to O₂ is 1:6.The amount of moles of C₆H₁₂O₆ consumed when 6.0 moles O₂ are used is given by:Moles of C₆H₁₂O₆ = Moles of O₂ ÷ 6Moles of C₆H₁₂O₆ = 6.0 ÷ 6Moles of C₆H₁₂O₆ = 1.0
Therefore, one mole of C₆H₁₂O₆ is consumed when 6.0 moles O₂ are used in the reaction.Given that the chemical equation for the reaction is: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O
The stoichiometric coefficient of O₂ is 6, which means that for every 6 moles of O₂ consumed, one mole of glucose is consumed.The molar ratio of C₆H₁₂O₆ to O₂ is 1:6.
The amount of moles of C₆H₁₂O₆ consumed when 6.0 moles O₂ are used can be calculated by using the molar ratio.Moles of C₆H₁₂O₆
= Moles of O₂ ÷ 6Moles of C₆H₁₂O₆
= 6.0 ÷ 6Moles of C₆H₁₂O₆
= 1.0
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