The overall charge of the given compound of potassium and Arsenic is zero (0).
What is the charge of an atom?
An atom consists of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. When the number of protons exceed the number of electrons, the atom will positively charged and it will be negatively charged if the number of electrons exceed the number of protons.
For the given compound;
KAs; As (Arsenic = -3) + K (potassium = +3)KAs overall charge = -3 + 3 = 0Thus, the overall charge of the given compound of potassium and Arsenic is zero (0).
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What is the concentration expressed in parts per million of a solution containing 20.0 grams of C6H12O6 in 80.0 grams of H2O?
A) 2.50 × 10^5 ppm
B) 2.00 × 10^5 ppm
C) 4.00 × 10^6 ppm
D) 5.00 × 10^6 ppm
Answer:
B is the answer. 2.00 x 10^5 ppm
Explanation:
Right on edmentum
cadmium metal reacts with a nickel (III) chlorate solution
Which of the following best describes science?
A. The use of experiments and investigations to form opinions
B. The study of the natural world in order to formulate answers to
untestable questions
C. The use of observations and experiments to answer questions
about the natural world
D. The study of the universe to answer philosophical questions
Answer:
c
Explanation:
Science is best described as a way of building knowledge about the world around us through observation and experimentation.
Two cities are located at the same latitude but have very different weather conditions. What factor would most likely cause this difference?
Their distances from the equator
Their distances from the poles
Their elevations above sea level
Their locations in different climate zones
Answer:
Their distances from the equator
Explanation:
The closer you are to the equator the more likely you are to experience warmer weather.
Which substance is completely consumed in a chemical reaction?
product
reactant
limiting reactant
Answer:
Limiting reactant
Explanation:
In a chemical reaction is the substance that is totally consumed when the chemical reaction is complete.
Which type of solid has the weakest forces holding it together?
lonic
Network
Molecular
Metallic
Answer:
network
Explanation:
ionic is strongest
chegg
A network is the type of solid that has the weakest forces holding it together.
What is it meant by the network?A network, in computing, is a group of two or extra gadgets or nodes that could talk. The gadgets or nodes in question can be connected through physical or wi-fi connections. The key is that there are at least separate components, and they may be connected.
A home wireless LAN (wireless local area network, or Wi-Fi network) is a good example of a small client-server network. Various devices in the home are wirelessly connected to a router that acts as the central node (server) in the home.
A network is a collection of computers, servers, mainframes, community gadgets, peripherals, or other devices related to permitting facts sharing. An example of a network is the net, which connects hundreds of thousands of people everywhere in the global.
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Compact efficient cars usually get 38 miles per gallon of gasoline
Answer:
Compact cars with smaller engines can't achieve more than 30 mpg because of the weight difference
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When the equation
_Pb2+ + Au²+ →__pb4+ + _Au
is correctly balanced using the smallest whole-number coefficients, the coefficient of Pb2+ will be
1.1
2.2
3.3
4.4
Submit Answer
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The answer is option 2 , the smallest whole-number coefficients, the coefficient of Pb²⁺ will be 2.
What is a Balanced Chemical Equation ?
Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.
This also means that total mass on the reactant side must be equal to the total mass on the product side.
There are two types of numbers that appear in chemical equations.
There are subscripts, which are part of the chemical formulas of the reactants and products;
and there are coefficients that are placed in front of the formulas to indicate how many molecules of that substance is used or produced.
Balance The Equation:
Pb²⁺ + Au²⁺ = Pb⁴⁺ + Au
Label Each Compound With a Variable
Label each compound with a variable to represent the unknown coefficients.
aPb²⁺ + bAu²⁺ = c Pb⁴⁺ + d Au
Create a System of Equations
Create an equation for each element where each term represents the number of atoms of the element in each reactant or product.
Pb: 2a + 0b = 4c + 0d
Au: 0a + 2b = 0c + 1d
e: 0a + -1b = -1c + 0d
2a - 4c = 0
2b - 1d = 0
-1b + 1c = 0
Solve For All Variables
Use substitution,
Substitute Coefficients and Verify Result
2Pb²⁺ + Au²⁺ = Pb⁴⁺ + 2 Au
So the answer is 2 , option 2
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A student weighs out 51.57 grams of sodium permanganate, NaMnO4. How many moles of NaMnO4 is this? The molar mass of NaMnO4 is 141.93 g/mol. Use the standard abbreviation for the units.
Your Answe
A student weighs out 51.57 grams of sodium permanganate. The moles of sodium permanganate is 0.363 mol.
What is molar mass?Molar mass of many compounds can be calculated by dividing the mass of the compound by the number of moles of the compound.
The molar mass is given 141.93 g/mol.
To calculate the moles
[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\rm Number\;of \;moles= \dfrac{51.57}{141.93} = 0.363\;mol[/tex]
Thus, the moles are 0.363 mol.
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A bike tire has a volume of 0.850L at a pressure of 40.0 psi and 0.00°C. What will be the
pressure of the tire at 35.0°C?
Answer:
45.13 psi
Explanation:
Assuming the volume does not change
P1/T1 = P2/T2 T must be in Kelvin
40/(273.15) = P2/(273.15 + 35) P2 = 45.13 psi
emitted helium nucleus
Determine the volume of Oxygen gas produced by decomposition of 2.44g KClO3?
Answer:
0.956 grams O₂ or
0.956 milliliters O₂ or
9.56 x 10⁻⁴ L O₂
Explanation:
If the reactant were to decompose completely, the entire balanced reaction would look like this:
2 KClO₃ --> 2 K(s) + Cl₂(g) + 3 O₂(g)
To find the answer, (1) convert the grams of KClO₃ to moles (via molar mass from periodic table), then (2) convert moles KClO₃ to moles O₂ (via mole-to-mole ratio from balanced equation), then (3) convert moles O₂ to grams (via molar mass from periodic table).
Molar Mass (KClO₃) = 39.098 g/mol + 35.453 g/mol + 3(15.999) g/mol
Molar Mass (KClO₃) = 122.548 g/mol
Molar Mass (O₂) = 2(15.999) g/mol
Molar Mass (O₂) = 31.998 g/mol
2.44 g KClO₃ 1 mole KClO₃ 3 moles O₂ 31.998 g
-------------------- x -------------------------- x -------------------- x ------------------------
122.548 g 2 moles KClO₃ 1 mole O₂
= 0.956 grams O₂
= 0.956 milliliters O₂
= 9.56 x 10⁻⁴ L O₂
**The prompt askes to determine the volume. As far as I know, there is no easy way to find liters/milliliters with the given information. As such, I found the mass of O₂ instead. Technically, grams is equal to milliliters, so this may be what you are looking for. Then, you can convert from milliliters to liters by dividing by 1,000 (if necessary). **
The mass of the door handle is 140 g, and 10 % of its mass is copper. How many *
MOLES of copper does the handle contain?
0.22 moles
Explanation:Moles are a measurement used in chemistry that describes the amount of an atom based on the number of atoms. One mole is equal to [tex]6.022*10^{23}[/tex], which is the number of atoms in 12 grams in Carbon-12.
Mass of Copper
Before finding the moles of copper, we need to know the mass. We are told that a door handle is 140g, but only 10% is copper.
To find 10% for 140 we can multiply 140 * 0.1.
140 * 0.1 = 14This means there are 14 grams of copper.
Moles of Copper
Now, we can use dimensional analysis to convert grams to moles. To do this we need to know how many grams of copper are in 1 mole. This number is called the molecular mass and can be found on the periodic table. This number is usually directly below the element's symbol and is the only number with decimal points (not all periodic tables will have the exact same molecular mass because the number can change, but they will be close).
The molecular mass for copper is 63.55. Next, we can set up a dimensional analysis conversion. Dimensional analysis is when you multiply some value by a ratio of 2 different values with 2 different units. This may sound confusing but it makes more sense when you do it.
[tex]14 g*\frac{1 mole}{63.55g}[/tex]When setting up an expression like this, make sure that the units cancel out so you are only left with the one you want. Units will cancel out if one is in the numerator of a ratio and the other is in the denominator.
Next, multiply this out (which is equivalent to dividing 14/63.55)
[tex]14 g*\frac{1 mole}{63.55g} = 0.22 moles[/tex]So, when rounded to significant figures, there are 0.22 moles in 14 grams of copper.
Which of the following is most likely caused by chemical weathering?
Chemical weathering is caused by rain water reacting with the mineral grains in rocks to form new minerals (clays) and soluble salts.
What is chemical weathering?Chemical weathering changes the molecular structure of rocks and soil.
Chemical Weathering is defined as the chemical reaction that takes place between the rain, flowing water, and rocks along with minerals.
It results in the decaying of minerals and the rocks for the formation of new minerals, as we as, the soluble salts due to the reaction being highly acidic.
Since the reaction is acidic, it causes 'unrecognizable facial features on a marble statue.
These reactions occur particularly when the water is slightly acidic.
Thus, chemical weathering is caused by rainwater reacting with the mineral grains in rocks to form new minerals (clays) and soluble salts.
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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
NH3 has a concentration of exactly 2.55 M has a Kb of 9.88 x 10-8 M.
a. What is the value of Kb expression for this acid?
b. What is the pH of this solution?
From the calculations, we can see that the pH of the solution is 2.3
What is Kb?The term Kb is know as the base dissociation constant. It gives the extent to which a base dissociates in solution.
Hence;
Ka = Kw/Kb = 1 * 10^-14/ 9.88 x 10-8 = 1 * 10^ -7
We have to set up the ICE table;
NH4^+(aq) + H2O(l)⇔ H3O^+(aq) + NH3(aq)
I 2.55 0 0
C -X +X +X
E 2.55 - x x x
Ka = [H3O^+] [NH3]/[NH4^+]
1 * 10^ -7 = x^2/2.55 - x
1 * 10^ -7 (2.55 - x) = x^2
x^2 - 2.55 * 10^ -7 + 1 * 10^ -7x = 0
x=0.0005 M
So; [H3O^+] = [NH3] = 0.0005 M
pH = -log(0.0005 M) = 2.3
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what volume of a 0.25M solution can be prepared with 28.5g of k2s? (molar mass=110.26g)
Answer:
volume = 1.04 dm^3
Explanation:
Data:
volume = ?
Molarity, M = 0.25M
mass = 28.5g
Molar mass = 110.25g
Moles = ?
Solution:
First find number of moles,
moles = mass in gram / molar mass
= 28.5 / 110.25
= 0.258
≈ 0.26 moles
Now,
Molarity = [tex]\frac{no. of moles}{volume in dm^3}[/tex]
So,
Volume in dm^3 = [tex]\frac{no. of moles}{molarity}[/tex]
= 0.26 / 0.25
Volume = 1.04 dm^3
what is the molarity of a solution in which 0.381 moles of CuCl is dissolved in 1039ml of water
Answer:
= 0.366 M
Explanation:
data;
moles = 0.381 moles
volume = 1039ml
= 1039 / 1000
= 1.039dm^3
molarity = ?
solution
molarity = [tex]\frac{moles}{volume in dm^3}[/tex]
= 0.381 / 1.039
molarity = 0.366 M
Acids and bases are both what?
Answer:
Both acids and bases are electrolytes which means that they're good conductors of electricity. Acids and bases both produce ions in water solution. Acids release hydrogen ions (H+) whereas Bases release hydroxide ions (OH-). The process of mixing acid or a base in water is an exothermic one.
Answer:
Electrolytes
Explanation:
Both acids and bases are electrolytes which means that they're good conductors of electricity. Acids and bases both produce ions in water solutions. Acids release hydrogen ions (H+) whereas Bases release hydroxide ions (OH-). The process of mixing acid or a base in water is an exothermic one.
B2
N
Which form of energy is a type of
potential and kinetic energy?.
a) Mechanical
b) Chemical
c) Electrical
d) Nuclear
Answer:
electrical
Explanation:
because since electricity moves thus giving us kinetic energy and it also stores energy giving is potential energy
If an atom has 7 protons, 8 neutrons, and 10 electrons, then it has a net charge of . On the other hand, if an atom has 3 protons, 3 neutrons, and 2 electrons, its net charge is .
Answer:
Neutrons play no role in the net charge of an atom, so you can ignore them here.
Proton = 7
Electron = 10
Net Charge = 7 - 10
= -3
Again,
Proton = 3
Electron = 2
Net Charge = 3 - 2
= 1
How many moles of carbon are in a sample of C4H10 that also contains 200 g of hydrogen?
Select one:
O a. 80.0
O b. 800
O c. 41.6
O d. 416
e.
960.8
The number of moles of carbon in a sample of C4H10 that also contains 200 g of hydrogen is 80 moles.
How to calculate number of moles?The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass.
According to this question, a sample of C4H10 was given meaning that the ratio of carbon to hydrogen is 4:10.
If 200 g of hydrogen is contained in the sample, then 200 × 4/10 = 80g of carbon is present.
no of moles of C = 80
Therefore, the number of moles of carbon in a sample of C4H10 that also contains 200 g of hydrogen is 80 moles.
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7. The picture below shows a girl with a widow's peak. Widow's peak She has a widow's peak because of her -
Answer:
genes (c)
Explanation:
since traits are passed down genetically, so her mother or father must have one (or even one of her grandparents)
hope this helps!:)
Answer: D.
Explanation:looks right to me it’s for sure not A hope did helped
How many mole of water would be found in 4.54 X 10 34 molecules of H2O help me please
Taking into account the definition of avogadro's number, in 7.54×10¹⁰ moles of water are 4.54×10³⁴ molecules of water.
Definition of Avogadro's NumberAvogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Amount of moles of H₂OYou can apply the following rule of three: if 6.023×10²³ molecules are contained in 1 mole of water, then 4.54×10³⁴ molecules are contained in how many moles of water?
amount of moles of water= (4.54×10³⁴ molecules × 1 mole)÷ 6.023×10²³ molecules
amount of moles of water= 7.54×10¹⁰ moles
Finally, in 7.54×10¹⁰ moles of water are 4.54×10³⁴ molecules of water.
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104 Equilibrium Constant 2
The toxic gas phosgene decomposes to a limited extent to carbon monoxide and chlorine at a certain temperature T K
according to the following equation:
COCI₂(g) CO(g) + Cl₂(g)
The equilibrium constant, Kc, is 0.00045 at this temperature.
What is the equilibrium constant for the reverse reaction?
Give your answer with 2 significant figures in the exponential form, for example, 1.5e3 for 1500.
From the calculations, the equilibrium constant of the reverse reaction is 2.22 * 10^3.
What is equilibrium constant?The term equilibrium constant refers to a number that shows the extent to which reactants are converted into products.
We can see that the equation is COCI₂(g) CO(g) + Cl₂(g) having Kc = 0.00045. The equilibrium constant of the reverse reaction is; 1/0.00045 = 2.22 * 10^3.
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For each reaction below, use the drop-down menus to select which compound will form a precipitate. Note: It is possible that no precipitates form. Na2S + Cd(NO3)2 → CdS + 2NaNO3 FeCl3 + 3KOH → 3KCl + Fe(OH)3 Na2CO3 + Ba(NO3)2 → BaCO3 + 2NaNO3
Answer:
1. Cadmium sulfide
2. Iron (III) hrydroxide
3. Barium carbonate
Cadmium sulfide, iron hydroxide, and barium carbonate will form a precipitate.
What is Precipitation Reaction?The precipitation reaction can be described as a chemical reaction taking place in an aqueous solution where two ionic bonds combine in order to form an insoluble salt.
These insoluble salts form are called precipitates in precipitation reactions. Precipitation reactions are commonly double displacement reactions in which the production of a solid forms a residue known as the precipitate.
The first reaction: [tex]Na_2S + Cd(NO_3)_2 \longrightarrow CdS + 2NaNO_3[/tex]
The cadmium sulfide forms precipitates in this reaction.
The second reaction: [tex]FeCl_3 + 3KOH \longrightarrow 3KCl + Fe(OH)_3[/tex]
The iron hydroxide forms precipitate in this reaction.
The third reaction:[tex]Na_2CO_3 + Ba(NO_3)_2 \longrightarrow BaCO_3 + 2NaNO_3[/tex]
The barium carbonate forms precipitate in this reaction.
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A Certain gas weighs 60g. IF the relative molecular mass of the gas is 12 what is the volume of the gas?
a. List six renewable resources that humans depend on. (0.5 point)
Answer:
-trees
-solar energy
-hydroelectricity
-wind energy
sorry I can only think or 4 atm
The results of the gold foil experiment led to the conclusion that an atom is
[tex]\sf\large \blue{\underbrace{\red{Answer⋆}}}:[/tex]
The nucleus of an atom of the element is positively charged and atom has a hollow space inside it.
Explanation:
This experiment was conducted by Rutherford in this experiment. He placed a gold foil and surround it with a screen.
And He exposed gold foil in alpha particles rays in which he noticed that most rays passed through atom which conclude that atom has a large space, some rays get deflected and some reverse their path this show that the positive charge of nucleus of an atom.
What branch of chemistry studies the flow of electrons?
A. Inorganic chemistry
B. Electrochemistry
C. Quantum chemistry
D. Organic chemistry
Answer:
Your answer is B, Electrochemistry!
Explanation:
This is the part of chemistry that studies the chemical process in which electrons flow. This flow is called electricity. Electricity is generated by the flow of electrons, from one element to another element. This reaction is called oxidation reduction.
Answer: B
Explanation: