40 g of calcium reacts with 71 g of chlorine to produce _____ g of calcium chloride
Answer: 111 g
Explanation:
According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles of calcium}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{40g}{40g/mol}=1mole[/tex]
[tex]\text{Number of moles of chlorine}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{71g}{71g/mol}=1mole[/tex]
[tex]Ca+Cl_2\rightarrow CaCl_2[/tex]
1 moles of calcium react with 1 mole of chlorine to give 1 mole of calcium chloride.
Mass of calcium chloride =[tex]moles\times {\text {molar mass}}=1mol\times 111g/mol=111g[/tex]
Thus 111 g of calcium chloride is produced.
A 5L sample of CO2 at 540 torr and 25 degrees celsius expands to 15L at 32 degrees celsius. What is the pressure of the new container?
The amount of dissolved oxygen that seawater can hold in solution will be greater in
An acid is a substance that increases the concentration of H3O+ ions in solution. Look at the reaction below of phenol (C6H5OH) with water: mc023-1.jpg Which reactant acts as an acid by contributing a H+ ion to create H3O+ in the chemical equation? C6H5OH(aq) H2O(l) C6H5O–(aq) H3O+(aq)
Consider the chemical equation in equilibrium. CH4(g) + H2O(g) mc004-1.jpg CO(g) + 3H2(g) What will happen to the equilibrium of this reaction if CO is added to the system? The equilibrium will shift to the left to favor the reverse reaction. The equilibrium will shift to the right to favor the forward reaction. The equilibrium will not be affected by changing the concentration of CO. The equilibrium in the system will be lost under this kind of stress.
Which of the following changes will increase the amount of solid solute able to be dissolved in a liter of liquid water?
A. increasing temperature
B. increasing surface area
C. decreasing temperature
D. decreasing pressure
Stepping on a bag of potato chips would cause what type of change?
What causes Brownian motion in colloids?
A. molecules of the dispersion medium colliding with dispersed phase particles
B. coagulation of particles of the dispersed phase
C. erratic flashes of light
D. There is no Brownian motion in colloids.
Answer:
The correct answer is option A.
Explanation:
Brownian motion is a random motion of particles present in the fluid such as air or liquid.This motion of the particles is due to collision with fast moving molecules in a fluid.
In colloids , molecules of dispersed phase are in motion due to the fast motion of dispersion medium's particle which imparts motion to these particles of dispersed phase by means of collision.
How many hydrogen atoms are there in 3.50 grams of methane?
Why is a dilute solution of oleic acid used instead of pure oleic acid?
which compound has the greatest percent composition by mass of sulfur
how many molecules are there in 9.34 grams of water
Answer: [tex]3.13\times 10^{23}molecules[/tex]
Explanation: To calculate the moles, we use the formula:
[tex]Moles=\frac{\text{Given mass}}{\text{Molar mass}}=\frac{9.34g}{18g/mol}=0.52mol[/tex]
1 mole of water contains=[tex]6.023\times 10^{23}molecules[/tex] of water
0.52 moles of water contain=[tex]\frac{6.023\times 10^{23}}{1}\times 0.52=3.13\times 10^{23}molecules[/tex] of water
One or more than one atoms bonds and makes up the molecules, it can be the same or different atoms that make up the compounds. Molecules present in the 9.34 gm of water are [tex]\rm 3.13 \times 10^{23}[/tex].
What is the formula for calculating molecules?Given,
Mass of the water (m) = 9.34 gm
The molar mass of the water (M)= 18 g/mol
From the mass and the molar mass number of the moles can be estimated:
[tex]\rm Moles (n) = \dfrac{\;\rm Mass}{\rm Molar \;mass}[/tex]
Substituting values in the above formula:
[tex]\begin{aligned}\rm n &= \dfrac{9.34\;\rm g}{18\;\rm g/mol}\\\\&= 0.52\;\rm mol\end{aligned}[/tex]
We know that,
1 mole of water = [tex]\rm 6.023 \times 10^{23}[/tex] molecules of water
0.52 moles of water = X molecules
Solving for X:
[tex]\begin{aligned} \rm X &= 0.52 \times \rm 6.023 \times 10^{23}\\\\&= \rm 3.13 \times 10^{23}\end{aligned}[/tex]
Therefore, [tex]\rm 3.13 \times 10^{23}[/tex] molecules are present.
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A substance is found to consist of 1.900g of silver, 0.250g of nitrogen, and 0.850g of oxygen. what is the percent by mass of oxygen in the compound?
Assign an oxidation number to each element in the reaction.
CaF2(s) + H2SO4(aq) → CaSO4(aq) + 2HF(g)
In CaF2, the oxidation number of Ca is __, and that of F is __ .
In H2SO4, the oxidation number of H is __, that of S is __, and that of O is __.
In CaSO4, the oxidation number of Ca is __, that of S is __, and that of O is __.
In HF, the oxidation number of H is __, and that of F is __.
The oxidation number is defined as the total number of electrons gained or lost in a chemical bond with another atom.
The oxidation number of the given elements are:
Ca is +2 and F is -1. H is +1, S is +6, and O is -2.Ca is +2, S is +6, and O is -2.H is +1, and F is -1.1. CaF₂ or calcium fluoride is an ionic bond. The oxidation number of Calcium is +2 and that of Flourine is -1. The net charge on the compound is zero.
2. Sulfuric acid is a type of covalent bond. The oxidation number of Hydrogen is +1, Sulfur is +6, and that of Oxygen is -2. The net charge on the compound is zero.
3. Calcium sulfate is a type of covalent bond and ionic bond. The oxidation number of Calcium is +2, Sulfur is +6, and that of Oxygen is -8. The net charge on the compound is zero.
4. Hydrogen Flouride is a type of covalent bond. The oxidation number of Hydrogen is +1 and that of Flourine is -1. The net charge on the compound is zero.
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How do you do mole conversions
How many moles are there in 1.09 kg of Al(OH)3?
How many formula units are there in 2.55 g of Pb(CO3)2?
A ________ is any device connected to a network such as a computer, printer, or game console.
Answer:
Node
Explanation:
Other examples of nodes include servers, personal computers, hubs switches, modems, and etcetera. These devices must be connected together in a network such as an Ethernet or WiFi. These nodes are given addresses depending on the communications layer they operate on the network.
A network device is anything that is connected to a network, such as a computer, printer, or gaming console. These devices communicate with each other and the wider world via various networks, with a prime example being a wireless WiFi router.
Explanation:A network device is any device connected to a network such as a computer, printer, or game console. This refers to any device that can send, receive, or forward information across network segments. Examples of network devices include everything from the personal devices we use every day—like smartphones and laptops—to the high-tech servers that power large-scale internet operations.
Each of these devices, whether it's a state-of-the-art gaming console or a simple printer, is a key part of the wider network it's connected to. These networks enable communication between devices, facilitating the transfer of data and information. Part of what makes these smart technologies attractive is their ability to connect us to one another and to the wider world.
A wireless WiFi router is an example of a network device that uses microwaves to exchange data wirelessly with devices such as cell phones and computers. This signifies how interconnected our devices are, not just to each other, but also to the internet at large.
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This chart shows descriptions of the atoms for four different substances. Which substance is a solid? Object 1 Object 2 Object 3 Object 4
Answer:
c: object 3
Explanation:
c: object 3
Explanation:
Can anyone answer this question?
What is a chemical property of soda ash
A. Write an equation for determining the number of moles of NaOH that are added to the flask based on [NaOH] and volume of NaOH titrant (mL NaOH):
B. Write a similar expression for the number of moles of H2SO4 in the flask based on [H2SO4] and the volume of H2SO4 (mL).
Substitute your expressions from A and B into this equation and solve for [H2SO4]
The concentration of [H2SO4] is obtained from; [NaOH] × VNaOH/ 2× VH2SO4
The equation of the reaction is;
2NaOH(aq) + H2SO4(aq) ------> Na2SO4(aq) + 2H2O(l)
Number of moles of H2SO4(nH2SO4) = [H2SO4] × VH2SO4
Number of moles of NaOH(nNaOH) = [NaOH] × VNaOH
Where;
[H2SO4] = concentration of H2SO4
VH2SO4 = volume of H2SO4
[NaOH] = concentration of NaOH
VNaOH = volume of NaOH
From the balanced reaction equation;
2 moles of NaOH reacts with 1 mole of H2SO4
2nH2SO4 = nNaOH
2[H2SO4] × VH2SO4 = [NaOH] × VNaOH
[H2SO4] = [NaOH] × VNaOH/ 2× VH2SO4
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Explain why a fluorescent light bulb is not as hot as an incandescent light bulb.
An incandescent bulb becomes hotter than a fluorescent bulb when turned on because in a regular incandescent bulb, there is tungsten wire where electricity is converts into heat. A regular incandescent light bulb requires 4 times more energy than a fluorescent bulb in order to produce the same amount of light. The conversion is such that for a 75-watt bulb, temperature get raised to approximately 2000 K. For such a high temperature, the radiating energy from the wire have some visible light. In such bulbs, 90% of the electricity get consumed in producing heat and only 10% produces light thus, they are not much efficient source of light.
On the other hand, fluorescent bulbs produce light with less amount of heat. In them, 40% of electricity is consumed in producing light and 60% in heat which is very less as compared to heat produced by a incandescent bulb. This is because when it get turned on, mercury atoms inside the bulb collides with electrons and produce UV light which is then converted into visible light using thin layer of phosphor power present inside the bulb. This produces low amount of heat thus, the bulb stays cooler, the bigger size of bulb also helps in dispersing heat.
Therefore, a fluorescent light bulb is not as hot as an incandescent light bulb.
Particles in plasmas collide more often, but that does not necessarily give them higher temperature.
Plasma particles have high kinetic energy (they move quickly).
Plasma particles are far apart.
The plasma in a fluorescent bulb has a low density.
How many ammonium ions, nh4 , are there in 5.0 mol (nh4)2s?
Answer: The number of ammonium ions in given moles of ammonium sulfide are [tex]6.022\times 10^{24}[/tex]
Explanation:
We are given:
A chemical compound having chemical formula of [tex](NH_4)_2S[/tex]
In 1 mole of ammonium sulfide, 2 moles of ammonium ions and 1 mole of sulfide ions are present.
According to mole concept:
1 mole of compound contains [tex]6.022\times 10^{23}[/tex] number of atoms
So, 5 moles of ammonium sulfide molecule will contain = [tex]5\times 2\times 6.022\times 10^{23}=6.022\times 10^{24}[/tex] number of ammonium ions.
Hence, the number of ammonium ions in given moles of ammonium sulfide are [tex]6.022\times 10^{24}[/tex]
Identify the examples of diffusion in the list below. Check all that apply.
A teacher takes the cap off a permanent marker. A few minutes later, students at the back of the classroom complain about the odor of the marker.
A cooking school student burns a piece of toast. Soon, the entire kitchen smells like burnt toast.
An inflated balloon shrinks when it is placed in a cold freezer.
Toxic fumes produced by a chemical factory are detected in the air in a town several miles away.
Heating a flexible container filled with gas causes it to expand.
Answer;
A teacher takes the cap off a permanent marker. A few minutes later, students at the back of the classroom complain about the odor of the marker.A cooking school student burns a piece of toast. Soon, the entire kitchen smells like burnt toast.Toxic fumes produced by a chemical factory are detected in the air in a town several miles away.Explanation;Diffusion is a type of passive transport that involves the movement of particles from a region of high concentration to a region of low concentration. Diffusion takes place in liquids and gases, since their particles can move randomly from one region to another.Therefore, diffusion results from the random movement of particles in which the net movement is down the concentration gradient that is, from a region of high concentration to a region of low concentration.Which of the following changes will always be true for a spontaneous reaction? (3 points)
+ delta G
+ delta S
- delta G
- delta H
Final answer:
The correct answer is "- delta G". For a spontaneous reaction, delta G must always be negative. This indicates that the reaction releases free energy and can proceed without external intervention.
Explanation:
The correct answer for which change will always be true for a spontaneous reaction is - delta G. This is because a spontaneous reaction is defined as one that proceeds on its own without any external influence, and for such a reaction, the change in Gibbs free energy, represented as delta G, must always be negative. This negative delta G indicates that the process is releasing free energy. The Gibbs free energy equation delta G = delta H - T delta S tells us that the spontaneity of a reaction depends on both the enthalpy change (delta H) and the entropy change (delta S) along with the absolute temperature in Kelvin (T). If the enthalpy change is negative (- delta H) and the entropy change is positive (+ delta S), delta G will always be negative, indicating a spontaneous reaction at all temperatures. However, if delta H is positive and delta S is negative, the reaction will never be spontaneous as delta G will be positive.
Lithium has a relative atomic mass of 7. Bromine has a relative atomic mass of 80. A compound was found to contain 16g of lithium and 183g of bromine. What is the empirical formula of this compound?
The empirical formula of the compound is LiBr.
To determine the empirical formula of the compound, we need to find the ratio of the number of moles of each element in the compound.
First, let's find the number of moles for each element:
Lithium (Li):
Mass of lithium (given) = 16 g
Relative atomic mass of lithium (from the periodic table) = 7
Number of moles of lithium = Mass / Relative atomic mass = 16 g / 7 g/mol ≈ 2.29 moles
Bromine (Br):
Mass of bromine (given) = 183 g
Relative atomic mass of bromine (from the periodic table) = 80
Number of moles of bromine = Mass / Relative atomic mass = 183 g / 80 g/mol ≈ 2.29 moles
Now, we need to find the simplest whole-number ratio of moles of lithium to moles of bromine. Both elements have approximately 2.29 moles. To find the ratio, we can divide both moles by the smallest number of moles:
Number of moles of Li = 2.29 moles / 2.29 moles = 1
Number of moles of Br = 2.29 moles / 2.29 moles = 1
The empirical formula of the compound is LiBr, indicating that there is one lithium atom for every one bromine atom in the compound.
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To find the empirical formula of a compound containing lithium and bromine, calculate the moles of each element based on their given masses and the relative atomic masses, then express the mole ratio in simplest whole number terms to obtain the empirical formula.
Explanation:The empirical formula of a compound can be found by dividing the mass of each element by its atomic mass to find the number of moles of each element and then expressing those values in the simplest whole number ratio. To determine the empirical formula for the compound containing lithium and bromine, we do the following steps:
Calculate the number of moles of lithium: moles of Li = 16 g / 7 g/mol.Calculate the number of moles of bromine: moles of Br = 183 g / 80 g/mol.Determine the simplest ratio by dividing both values by the smallest number of moles calculated in the previous steps.Once we have the simplest whole number ratio of the moles of lithium to moles of bromine, that ratio will be used to write the empirical formula.
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14) A wheelbarrow is experiencing two forces. One is pushing 5 N to the east and the other 5 N in the exact opposite direction. What must be true of the wheelbarrow's motion?
a.It is moving.
b.It is accelerating.
c.It is slowing down.
d.It isn't accelerating.
i think it is D) because,
The forces on the wheelbarrow are balanced. Therefore, it cannot accelerate, but it doesn't have to be still.
HOPE THIS HELPS
(T_T)
Which sentence about the periodic table of elements is true? *
All elements in period 2 are metals
. All elements in group 18 are metals.
Metals are found on the left side of the periodic table.
D. Metals are found on the right side of the periodic table.
The true statement about the periodic table is that metals are found on the left side of the periodic table, and nonmetals are located on the upper right, with a diagonal band of semimetals separating them.
Explanation:The correct answer to the question "Which sentence about the periodic table of elements is true?" is that metals are found on the left side of the periodic table. This is because the elements can be categorized generally into metals, nonmetals, and semimetals, and it is known that metals occupy the left side of the periodic table. Nonmetals are found primarily on the upper right side, and they are divided from metals by a diagonal band of semimetals. Specifically, Group 1 contains the alkali metals, and Group 2 houses the alkaline earth metals, while Group 17 has the halogens and Group 18 has the noble gases, which are nonmetals.
Which of the following statements is true? Temperature is the same as heat. Heat can travel through a vacuum. Heat has shorter wavelengths than visible light. All of the above.
Answer:
All the above
Explanation:
Answer:
Heat has shorter wavelengths than visible light.
PLEASE MARK BRAINLIEST
The process that fuels a star is BEST described as________.