Answer:
the best tool for separating marbles from water is evaporation disc
1.2 x 10-3 M in ph and is a acid or a base
Answer:
base
Explanation:
bases have a phone scale more than 7
Perform the following
mathematical operation, and
report the answer to the
correct number of significant
figures.
16.52 x 5.8 =
Answer:
95.8
Explanation:
The number comes out to be 95.816, but you round multiplcation to the lowest significant figure present in the problem. 16.52 has 4 sig figs, and 5.8 has 2 sig figs. Thus, your answer ends up being two significant figures.
Answer: 96
Explanation:
# 19 of precipitation
The value of Ksp for calcium sulfate is 2.4 x 10-5.
A solution of calcium sulfate with a concentration of 2.0 x 10-2 mol L-¹ is
Select one:
O a. undersaturated and precipitation of solid calcium sulfate will occur.
O b. of unknown saturation so prediction is not possible.
O c. undersaturated and precipitation of solid calcium sulfate will not occur.
O d. supersaturated and precipitation of solid calcium sulfate will occur.
supersaturated and precipitation of solid calcium sulfate will not occur.
e.
The solution is undersaturated and precipitation of solid calcium sulfate will not occur.
What is Ksp?Ksp stands for solubility product constant. The solubility product constant, Ksp, is the equilibrium constant for a solid substance dissolving in an aqueous solution.
From the given information, the solubility product constant of calcium sulfate is smaller than the concentration of its solution, thus, the solution is undersaturated and precipitation of solid calcium sulfate will not occur.
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1. Suppose you had 58.44 grams of NaCl and you dissolved it in exactly 2.00 L of solution.
What would be the molarity of the solution?
11. How many molecules of oxygen will be consumed when 33.6 liters of water is produced?
Answer:
67.2 litres of oxygen will be consumed
Explanation:
Step 1 : Write the balanced chemical equation:
2H₂ + O₂ → 2H₂O
Step 2: find the ratio of O₂ : H₂O
O₂ : H₂O
1 : 2
67.2 : 33.6
Thus, 67.2 litres of oxygen will be consumed
0. Calculate the amount of heat absorbed when 5.50 g of aluminum is heated from
25.0°C to 95.0°C. The specific heat of aluminum is 0.897 J/g °C).
Answer:
34.5J
Explanation:
Amount of Heat(Q) = mc∆T
where m (mass of aluminum) = 5.50g
c (specific heat capacity of aluminum) = 0.897J/g°C and ∆T = 95.0°C - 25.0°C = 70.0°C
Q = 5.50x 0.897x 70.0
= 34.5354J = 34.5J
The amount of heat absorbed when 5.50 g of aluminum is heated from 25.0°C to 95.0°C is 34.5 J.
What is heat?Heat is defined as a form of the energy transmitted from one body to another as a result of a temperature difference.
It can also be defined as the potential energy stored in the bonds that hold the object's particles together.
Heat absorption is defined as absorption of heat without increasing the temperature at the certain point.
Amount of heat = mcΔT
Where m = 5.50g
c = 0.897 J/g °C
ΔT = 95.0°C - 25.0°C
= 70.0°C
So, amount of heat = 5.50 x 0.897 x 70.0
= 34.5354 J = 34.5 J
Thus, the amount of heat absorbed when 5.50 g of aluminum is heated from 25.0°C to 95.0°C is 34.5 J.
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At 298 K, AH = 46 kJ/mol and sº = 0.097 kJ/(K-mol). What is the Gibbs
A. 17 kJ
B. 1300 kJ
C. 0.63 kJ
D. 75kJ
The Gibbs Free Energy at 298 K, AH = 46 kJ/mol and sº = 0.097 kJ/(K-mol) is 28.906 kJ/mol
What is Gibb's Free Energy ?It serves as the single master variable that determines whether a given chemical change is thermodynamically possible.
Thus if the free energy of the reactants is greater than that of the products, the entropy of the world will increase when the reaction takes place as written, and so the reaction will tend to take place spontaneously.
Conversely, if the free energy of the products exceeds that of the reactants, then the reaction will not take place in the direction written, but it will tend to proceed in the reverse direction.
At 298 K,
AH = 46 kJ/mol
and sº = 0.097 kJ/(K-mol).
ΔG=ΔH−T⋅ΔS
ΔG = 46 - 298 * 0.097
ΔG = 46 - 28.906
ΔG = 28.906 kJ/mol
The Gibbs Free Energy at 298 K, AH = 46 kJ/mol and sº = 0.097 kJ/(K-mol) is 28.906 kJ/mol
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Answer: A
Explanation: just did it
4. The half-life of F-20 is 11.0 s. If a sample initially
contains 5.00 g of F-20, how much F-20 remains after
44.0 s
The amount of the F–20 that will remain after 44 s given the data from the question is 0.3125 g
Data obtained from the question Half-life (t½) = 11 sOriginal amount (N₀) = 5 gTime (t) = 44 sAmount remaining (N) = ?How to determine the number of half-lives Half-life (t½) = 11 sTime (t) = 44 sNumber of half-lives (n) =?
n = t / t½
n = 44 / 11
n = 4
How to determine the amount remaining Original amount (N₀) = 5 gNumber of half-lives (n) = 4Amount remaining (N) = ?N = N₀ / 2ⁿ
N = 5 / 2⁴
N = 5 / 16
N = 0.3125 g
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The proposed mechanism for a reaction is:
Step 1: A+B= X(fast)
Step 2: X+C - Y(slow)
Step 3: Y - D (fast)
Which rate law is consistent with this mechanism?
-
O A.
rate = k[A][B]
ОВ.
rate = K[X][C]
O C.
rate = k[A][B][C]
OD.
rate = k[X][Y]
=
Answer:
rate = k[X][C]
Explanation:
When you are solving for rate law, you are only looking at the reactants of the slow reaction. In this case, step 2 is the slow one. Since there is only one X and one C on the reactants side, the coefficient in the rate law would each be one, which you don't need to include, as it is assumed.
A waste treatment settling tank treats an industrial waste inflow (QIN) of 0.2 m3/s with a suspended particulate concentration (CIN) of 2000 mg/L. The settling reactor has a sludge flow (SS) to a centrifuge of 360 grams/s, and a flow (QS) of 0.050 m3/s. The centrifuge has a return flow (QR) to the settling tank of 0.048 m3/s and a concentration (CR) of 408 mg/L.
1. What is the effluent flow (QE, in m3/s), concentration (CE, in mg/L) and particulate mass flow (SE, in grams/s)
2. What is the concentration (CDW) and particulate mass flow rate (SDW) for the dewatered sludge?
The effluent flow in concentration and particulate mass flow will be 0.198m³/sec.
How to calculate the effluent flow?It should be noted that the total inflow will be equal to the total outflow. Therefore,
0.2 + 0.048 = 0.05 + We
Collect like terms
Qe = 0.2 + 0.048 - 0.05
Qe = 0.198m³/sec
The concentration will be:
= (360 × 1000)/0.05
= 7200mg/L.
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Which of the following is a synthesis reaction?
a) 2KCIO3 → 2KCl + 302
O b) 2 C4H20 + 13 02 + 8 CO2 + 10 H20
O c) Fe + CuCl2 → FeCl2 + Cu
O d) 4 A1+3 02 → 2 Al2O3
Answer: 4 A1+3 02 → 2 Al2O3
Explanation: Two different atoms combines together to produce a compound.
Answer:
c) Fe + CuCl2 → FeCl2 + Cu
Explanation: Synthesis Reaction is when you get same thing on the other side even if its not in the same order after you add the components.
Plate Boundaries and Movement report
When a fuel is burned, energy is released. Where do you think that energy comes from?
The energy comes from the sun, captured through photosynthesis.
How many pounds of manganese are in 1.261 tons of Mn2O3?
Answer:
2000pound
Explanation:
Manganese metal is produced from the manganese(III) oxide, Mn2O3, which is found in manganite, a manganese ore. The manganese is reduced from its +3 oxidation state in Mn2O3 to the zero oxidation state of the uncharged metal by reacting the Mn2O3 with a reducing agent such as aluminum or carbon. How many pounds of manganese are in 1.261 tons of Mn2O3? (1 ton = 2000 pounds)
About 40 different substances called organophosphorus compounds are registered in the United States as insecticides. They are considered less damaging to the environment than some other insecticides because they breakdown relatively rapidly in the environment. The first of these organophosphorus insecticides to be produced was tetraethyl pyrophosphate, TEPP, which is 33.11% carbon, 6.95% hydrogen, 38.59% oxygen, and 21.35% phosphorus. It has a molecular mass of 290.190.
A quantity can be converted from one unit of measurement to another while maintaining its value. There are 2522 pounds of manganese in 1.261 tons of [tex]\rm Mn_2O_3[/tex].
It is a fundamental idea that is applied in many different disciplines such as science, engineering, math and daily life. To complete a conversion, it is necessary to know the conversion factor – the numerical relationship between the two units of measurement. With the help of this factor, you are able to convert units while keeping the value constant.
To convert tons to pounds we need to know that 1 ton is equal to 2000 pounds.
Given that you have 1.261 tons of [tex]\rm Mn_2O_3[/tex], we can calculate the number of pounds as follows:
Number of pounds = 1.261 tons * 2000 pounds/ton
Number of pounds = 2522 pounds
Therefore, there are 2522 pounds of manganese in 1.261 tons of [tex]\rm Mn_2O_3[/tex].
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formular for calculating weight
The weight of an object is defined as the force of gravity on the object and may be calculated as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton.
W = mg
Weight of object = mass of object × acceleration of gravity
A sample of P2Cl5 contains 179 g of phosphorous, how many grams of chlorine are present? Please show step by step thx!
Answer:
About 512 g.
Explanation:
We are given a sample of P₂Cl₅ that contains 179 grams of phosphorus, and we want to determine the grams of chlroine that is present.
Thus, we can convert from grams of phosphorus to moles of phosphorus, moles of phosphorus to moles of chlorine, and moles of chlorine to grams of chlorine.
From the formula, there are two moles of P for every five moles of Cl. The molecular weights of P and Cl are 30.97 g/mol and 35.45 g/mol, respectively. Hence:
[tex]\displaystyle 179\text{ g P} \cdot \frac{1\text{ mol P}}{30.97\text{ g P}} \cdot \frac{5\text{ mol Cl}}{2\text{ mol P}} \cdot \frac{35.45\text{ g Cl}}{1\text{ mol Cl}} = 512\text{ g Cl}[/tex]
In conclusion, there is about 512 grams of chlorine present in the sample.
Alternatively, we can mass percentages. The mass percent of phosphorus in P₂Cl₅ is:
[tex]\displaystyle \% \text{P} = \frac{2(30.97)}{5(35.45) + 2(30.97)} = 25.90\%[/tex]
Because there are 179 grams of phosphorus, the total amount of sample present is:
[tex]\displaystyle \begin{aligned} 25.90\% \cdot m_T & = 179\text{ g P} \\ \\ m_T & = 691.1 \text{ g}\end{aligned}[/tex]
Therefore, the amount of chlorine present is 691.1 g - 179 g, or about 512 g, in agreement with our above answer.
Running the reaction at 60 C would cause the reaction to...
a. Run SLOWER than normal.
b. Run FASTER than normal.
Answer:
b. Run FASTER than normal.
Explanation:
Standard temperature is 273 K or 0°C.
Hence, running the reaction at 60°C, which is higher than normal, would cause the reaction to run faster than normal.
what is the formula to find the volume of a marble
Individual marble:
4/3_?_ R^3Answer:
Individual Marble
Use the formula 4/3_?_ R^3, to solve for the volume. Here, R is the radius, or half of D. ^3 means the radius is cubed.
Explanation:
kilometre is a multiple of metre why
Which statements describe a mixture? Choose all correct answers. In a mixture, the properties of every substance change. A mixture can be separated by a filter. A mixture produces a completely new substance. In a mixture, molecules can mix, but do not change completely. A mixture can be separated only by chemical means. In a mixture, no chemical changes take place.
a mixture can be separated by a filter
How many molecules of hydrogen fluoride (HF) are in (8.5x10^-2) moles of hydrogen fluoride (HF)?
Molecules and the moles can be interconverted into each other with the help of the Avogadro's number. In 8.5 x 10⁻² moles of hydrogen fluoride, there are 51.17 × 10²¹ molecules.
What is Avogadro's number?Avogadro's number is the special number that converts the moles into molecules and vice versa. The value of the Avogadro's number is 6.02 x 10²³.
If 1 mole of HF has 6.02 x 10²³ molecules then,
8.5 x 10⁻² moles of HF will have:
(8.5 x 10⁻²) × 6.02 x 10²³) = 51.17 × 10²¹
Therefore, 51.17 × 10²¹ molecules are present in HF.
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6. How many liters of 4.0 M solution can
be made using 8.0 mol of lithium
bromide?
8.0 mol of lithium bromide
4 M solution of lithium bromide requires 4 moles of the compound per liter
8 ÷ 4 = 2
answer is 2 Liters
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what is the number of moles in 71g H20
The number of moles in 72 gram H₂O is 3.942 MOL.
What are moles?The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
First, know the molar mass of water.
The given mass is 71 gram
[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\\\rm Number\;of \;moles= \dfrac{71}{18.01}= 3.942 mol[/tex]
Thus, the number of moles in 72 gram H₂O is 3.942 MOL.
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elenium dichloride, SeCl2, has a molar mass of 149.86 g/mol. What is the mass in grams of 0.195 moles of SeCl2? Use the common abbreviation for the units.
Selenium chloride has a molar mass of 149.86 g/mol. The mass of selenium dichloride in grams is 29.22 grams.
What is mass?
Mass is the quantity of matter of a physical body.
The molar mass is given 149.86 g/mol
The number of moles is 0.195
By the formula of molar mass
[tex]\rm Molar\;mass = \dfrac{mass}{number\;of\;moles} \\\\\rm mass = molar mass \times number\;of\;moles\\\rm mass =149.86 \times 0.195 = 29.22 g[/tex]
Thus, the mass of selenium dichloride in grams is 29.22 grams.
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What is the name of the functional group that is attached to this hydrocarbon?
H
H
• alkyl halide
alcohol
carbonyl
ketone
Two molecules having different sizes but the same functional groups will take part in chemical reactions. Functional groups are used in the field of organic chemistry. Here the given molecule has ketone functional group. The correct option is D.
What are functional groups?The substituent atoms or groups of atoms which are attached to specific molecules are defined as the functional groups. These moieties are responsible for the chemical reactions. The same functional group will experience comparable reactions regardless of the chemical in which it is present.
A ketone is a functional group which consists of a carbonyl carbon bound to an oxygen atom by a double bond and two alkyl or aryl groups. Ketones are usually represented as RCOR, where two R's can be any alkyl or aryl group. Their general formula is CₙH₂ₙO.
Lower ketones are soluble in water because they consist of the polar carbonyl group.
Thus the correct option is D.
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Lab: Plate Boundaries and Movement Lab Report.
A Plate Boundaries and Movement Lab Report is a report that shows the records of all the data relating to the movement of Plate Boundaries and their movements.
What are Plates in this context?A tectonic plate is also described or referred to as a Lithosperic Plate. In Geography, it is described as a slab of rock that is not shaped regularly.
In most cases, it comprises continental and oceanic lithosphere.
Why is it crucial to record the movement of plates and their boundaries?Plate Boundaries and their movement are largely linked to volcanic activities and earthquakes. This means that they can be used to predict when any of the above-mentioned events may happen.
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Solve:
Can water stay liquid below zero degrees Celsius?
Yes. If you lower the temperature of a test tube of water slowly, the water can remain liquid if it is not disturbed. As soon as the super cold water is disturbed the water will start crystalizing at a nucleation point and will convert to ice very quickly.
Ionic bonds form between which two types of elements?
Answer:
Cation and anion.
Cation is a positive ion.
Anion is negative ion.
E.g.: NaCl, CaF2, KBr
Which of the following results when hydrogen and chlorine chemically bond to form hydrogen chloride?
A.
a solution
B.
a mixture
C.
a precipitate
D.
a compound
Answer:
Hydrogen chloride is a mixture of hydrogen and chlorine elements. The chemical abbreviation of hydrochloric acid is HCl.
Explanation:
The electron configuration of an element is shown below.
1s^22s^22p^5
Name the group this element belongs to in the periodic table and explain your answer. Based on the electron configuration, explain how many electrons it is likely to receive from the atom of another element during the formation of a bond.
Answer:
Fluorine 1s2 2s2 2p5
Explanation:
it is likely to receive 1 electron
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In the periodic table, this element belongs to the 17th group. As a result, the element has a tendency to gain one electron during bond formation in order to achieve octet.
What is octet state?According to the octet rule, atoms are most stable when their valence shells contain eight electrons. The eight electrons that fill an atom's outermost shell are known as octets.The octet rule is significant because it predicts how atoms will bond based on their valence electrons' outer shells. Atoms form a certain number of bonds in order to share electrons with other atoms, resulting in an octet of eight electrons. For example, the outer shell of oxygen contains only six electrons.electronic configuration is:
[tex]1s^22s^22p^5[/tex]
The given element contains two electrons in the 2s orbital and five electrons in the 2p orbital. As a result, the energy level with n = 2 is the outermost energy level in this case. As a result, the element has 2 + 5, or 7 valence electrons. Elements with 7 valence electrons are classified as belonging to periodic table group 17.The element has 7 valence electrons, so it requires one more electron to achieve the stable octet state. As a result, the element has a tendency to gain one electron during bond formation in order to achieve octet.To learn more about octet rule, refer:
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