Answer:
lithium lithium (or 2lithium) + oxygen ->
Explanation:
Your welcome
How many milliliters of a 12% (v/v) propyl alcohol solution would you need to obtain 7.5 mL of propyl alcohol? Answer to the tenth
[tex]\tt \dfrac{7.5}{12}\times 100=62.5~ml[/tex]
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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If the volume of an air pump used to inflate a football decreases from 480 mL to 375 mL, and the original
pressure was 93.5 kPa, what is the new air pressure in the pump if the temperature stays constant?
Answer
Explanation:
P1=93.5 kPa V1=480 mL P2=? V2=375 mL
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
Which of the following indicates an endothermic reaction? I will mark as brainliest if correct.
Answer:
A + B → C + D + heat
Explanation:
A. A+B+heat⇒C+D
In an endothermic reaction, the system requires energy/heat, the enthalpy change is positive.
What is the [OH-] of a solution which has a [H+] of 1×10−5 M1×10−5 M?
Calculate the solubility product for the following:
Ce(IO3)4, 1.5 × 10–2 g/100.0 mL (IO3- is the anion)
Ksp = ______ x10______
Use correct significant figures
Answer: 2.749 x 10^-14
Explanation:
Given:
The concentration of Ce(IO3)4 in the solution = 1.5 x 10-2 g/100 mL= 0.15 g/1000 mL= 0.15 g/L
Molar mass of Ce(IO3)4 = 839.7267 g/mol
Therefore, the molarity of Ce(IO3)4 in the solution is given by:
[tex]$$\begin{gathered}M=\frac{0.15 \mathrm{~g} / L}{839.7267 \mathrm{~g} / \mathrm{mol}} \\M=1.7863 \times 10^{-\mathbf{4}} \mathrm{mol} / {L}=\mathbf{1 . 7 8 6 3 \times 1 0 ^ { - \mathbf { 4 } } \boldsymbol { M }}\end{gathered}$$[/tex]
The solubility equilibrium is given by:
[tex]$$\mathrm{Ce}\left(\mathrm{IO}_{3}\right)_{4(s)} \rightleftharpoons \mathrm{Ce}_{(a q)}^{3+}+3 \mathrm{IO}_{3}^{-}(a q)$$[/tex]
Therefore, the solubility product is given by:
[tex]\begin{gathered}K_{s p}=\left[C e^{3+}\right] \cdot\left[I O_{3}^{-}\right]^{3} \\\therefore K_{s p}=\left(1.7863 \times 10^{-4}\right) \times\left(3 \times 1.7863 \times 10^{-4}\right)^{3}\end{gathered}[/tex]
[tex]\therefore {K_{s p}=2.749 \times 10^{-14}[/tex]
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:
SI unit are used for scientific measurement why
Answer:
Explanation:
SI unit is an international system of measurements that are used universally in technical and scientific research to avoid the confusion with the units. Having a standard unit system is important because it helps the entire world to understand the measurements in one set of unit systems.
Unit of Electric Charge: Unit of Wavelength
Unit of Mass: Unit of Velocity:
Which natural hazard is least likely to affect Florida?
drought
wildfire
rip current
tsunami
Answer:
A rip current is least likely to affect Florida.
Explanation:
Since Florida is surrounded by bodies of water it would make sense for Tsunamis to occur frequently. Florida is also known to have drought problems and sometimes also wildfires. A rip current would probably affect Florida the least as it is also the least dangerous to society.
Answer:
tsunami
Explanation:
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:
calculate the molecular weight of ammonium chloride
Answer:
14.0067 + 1.00794*4 + 35.453
Explanation:
what is the molarity of a solution in which 0.257 moles of HNO2 is dissolved in 490ml of water
Answer:
= 0.524M
Explanation:
data;
volume = 490ml
= 490 / 1000
= 0.49 dm^3
moles = 0.257 moles
molarity = ?
solution:
molarity = [tex]\frac{no. of moles}{volume in dm^3}[/tex]
= 0.257 / 0.49
molarity = 0.524M
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
What happens to the distance between molecules when a substance changes from a liquid to a gas? Why?
Answer: As the substance changes from a liquid to a gas, bonds within its molecules almost dissapear and the average distance between them.
Explanation:
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
How many moles of calcium do you have if you measure out 13.95 g of calcium?
Moles are the divisional of the mass and the molar mass. In 13.95 gms of calcium, there are 0.348 moles.
What are moles?In chemistry, moles are the measurement units that are used to estimate the small entities of the atoms or the molecules. Moles are calculated as:
Moles = mass ÷ molar mass
We know,
The molar mass of calcium = 40 gm/mol
The mass of calcium = 13.95 gms
Moles of calcium are calculated as:
Moles = 13.95 ÷ 40
= 0.348 moles
Therefore, in 13.95 gms 0.348 moles of calcium is present.
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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 Certain gas weighs 60g. IF the relative molecular mass of the gas is 12 what is the volume of the gas?
kilometre is a multiple of metre why
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?
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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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.
What is the formula mass
Answer:
mass is always constant for a body.
Explanation:
one way to calculate mass is Mass=Volume ×Density
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.
Select the correct structure that corresponds to the name
(See image)
2-methyl pentane
The correct structure that corresponds to the name in the image above is structure A. Details about hydrocarbons can be found below.
What is an alkane?Alkanes are organic compound that belongs to any acyclic saturated hydrocarbon e.g. methane, ethane, etc.
Alkanes have a single carbon bond and can be attached to by certain compounds. Methyl is a compound with the formula; CH3.
Therefore, the correct structure that corresponds to the name in the image above is structure A.
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Answer:
C
Explanation:
It was right on acellus
A system is a group of parts that can be considered one unit. Storm systems, ecosystems, and our bodies are natural systems. Cars and houses are human-made systems. Choose an example of a system, and analyze the energy flow through the system. Describe in detail how energy enters the system, how energy changes form while in the system, and how energy leaves the system.
An ecosystem is simply a collection of communities of plants, animals, and microbes interacting together and with their physical environments.
Energy flow in an ecosystemEnergy enters the ecosystem through a group of living organisms known as the producers. the producers are mainly the green plants that are capable of photosynthesizing.
Photosynthesis converts solar radiation from the sun to chemical energy in green plants. Another group of organisms in the ecosystem, the primary consumers, feed directly on the producers and as such, are able to gain some energy from them.
The secondary consumers obtain their own energy by feeding on primary consumers. Tertiary consumers feed on the secondary consumers for their own energy and the food chain goes on and on.
Only about 10% of the available energy in one trophic level goes to the next trophic level. The rest of the energy is lost as heat to the surroundings. Thus, the producers have the highest energy in the ecosystem while organisms at the top of the food chain have the lowest energy.
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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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Reactions
Predict the products for the single replacement reactions given. Check to see that the equations are
balanced.
Ca + MgCl2 →?
-
O CaCl2 + Mg
O Ca + Cl2
0 Mg + Cl2
CaCl + Mg
Answer:
answer in picture
Explanation:
The balanced chemical equation will be Ca + MgCl2 → CaCl2 + Mg.
What is balanced chemical equation?An equation that has the same quantity of atoms on both sides of the arrow would be said to represent a balanced chemical reaction.
The given equation is Ca + MgCl2 →
It is known that when Ca is reacted with magnesium chloride ( MgCl2) then it will form calcium chloride (CaCl2 ) and magnesium.
Ca + MgCl2 → CaCl2 + Mg.
It can be seen that, calcium has one atom in the reactant side and one atom in product side. On the other hand, chlorine has one atom in reactant side as well as product side.
Hence, the reaction will be balanced.
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Janet observes that the shape of a dented table tennis ball is restored by heating the ball gently in warm water. Which of the following gas laws is used to understand the observation made by Janet and why?
The high temperature lowers volume according to Boyle's law because this law describes how a gas will behave when the number of moles remains constant.
The high temperature raises volume according to Boyle's law because this law describes how a gas will behave when the number of moles remains constant.
The high temperature lowers the volume of air inside the ball according to Charles's law because this law describes how a gas will behave at constant pressure.
The high temperature raises the volume of air inside the ball according to Charles's law because this law describes how a gas will behave at constant pressure.
Answer: The high temperature raises the volume of air inside the ball according to Charles's law because this law describes how a gas will behave at constant pressure.
Answer:
D. The high temperature raises the volume of air inside the ball according to Charles's law because this law describes how a gas will behave at constant pressure.
Explanation:
I took the exam
