Answer:
B. Spectator ions
Explanation:
Spectator ions are described as spectators literally because they "spectate", or, in other words, do not participate in the overall reaction. They may show up in the reaction equation, but they don't react themselves.
Thus, spectator ions stay unchanged throughout a reaction. We see many spectator ions in precipitation reactions. Remember that ionic compounds disassociate in solution.
For example, the reaction between silver nitrate [tex]AgNO_{3}[/tex] and sodium chloride [tex]NaCl[/tex] produces a solid precipitate of silver chloride [tex]AgCl[/tex] as represented by the equation below:
[tex]Ag^+_{(aq)} + NO^-_{3(aq)}+Na^+_{(aq)}+Cl^-_{(aq)}[/tex] -------> [tex]AgCl_{(s)}+Na^+_{(aq)}+NO_{3(aq)}^-[/tex]
However, the sodium and nitrate ions remained aqueous, like before, so they did not react. Thus, they are spectator ions.
emitted helium nucleus
Write the formula unit equation for this reaction occuring in water:
Calcium sulfide and iron(II) bromide are mixed to form iron(II) sulfide and calcium bromide.
1. CaS(aq) + FeBr(aq) →FeS(s) + CaBr(aq)
2. CaS(aq) + Fe2Br(aq) →Fe2S(s) + CaBr2(aq)
3. CaS(aq) + FeBr2(s) →FeS(s) + CaBr2(aq)
4. CaS(aq) + FeBr2(aq) →FeS(s) + CaBr2(s)
5. CaS(aq) + FeBr2(aq) →FeS(s) + CaBr2(aq)
6. CaS(s) + FeBr2(aq) →FeS(s) + CaBr2(s)
7. CaS(aq) + FeBr2(aq) →FeS(aq) + CaBr2(aq
The formula unit equation for the given reaction occurring in water is
CaS(aq) + FeBr₂(s) → FeS(s) + CaBr₂(aq).
What is chemical reaction?
Chemical reactions are those reaction in which reactant molecules react with each other for the formation of product.
When calcium sulfide reacts with iron (II) bromide for the formation of iron(II) sulfide and calcium bromide will be represented through the following equation:
CaS(aq) + FeBr₂(s) → FeS(s) + CaBr₂(aq)
Above reaction best explains the formula unit of given reaction as all valency of atoms are satisfied there.
Hence, the required formula unit is CaS(aq) + FeBr₂(s) → FeS(s) + CaBr₂(aq).
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Based on the kinetic theory, which statement is true? (5 points)
O Matter consists of only large molecules.
Matter is made up of only charged particles.
The particles of matter have zero kinetic energy and potential energy.
O The particles of matter are arranged in different ways for the different states.
Answer:
the particles of matter are arranged in different ways for the different states
Explanation:
because solid liquid and gas all three matters have different states for example the particles in a solid are closely packEd and form of movement is vibration
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.
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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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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A certain compound is made up of one carbon (C) atom, two chloride (Cl) atoms and one oxygen (o) atom what is the chemical formula of this compound
CO(Cl)2 will be the formula which has a common name of phosgene a highly poisonous gas .
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.
SCIENCE!
Kaila was organizing data about the rise in popularity of computers and internet usage
in the US. She made a table with the percentages of home with computers and internet access. Which of the following is NOT a reason that home computer and internet usage have increased?
A.more options for computer technologies
B.better offsite storage facility and server farms
C.home computers contain better technology and can be cheaper
D.better reliability of data transmissions
Which sport is required to have both male and female competitors?
A. Water polo
B. Swimming
C. Hockey
D. Mixed doubles tennis
Answer:
D. Mixed doubles tennis
Explanation:
Mixed doubles tennis is just normal tennis but the 'mixed' means that on both teams there is both one man and one woman.
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.
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
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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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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When the atoms that are transition elements form ions, the __ electrons are lost before the _electrons are lost.
Answer:According to the Aufbau principle, the electrons fill the 4s sublevel before beginning to fill the 3d sublevel. However, the outermost s electrons are always the first to be removed in the process of forming transition metal cations.
Explanation:hope its help
advantage of fossil fuels
Answer:
I don't know
Explanation:
I don't know the answer but it is use for car
1.consider the following overall reaction 6 CL + 2 AU³ → 3C L₂(g) + 2 AU (s)
(I) write down the cell notation for the cell
(i) Construct a fully labelled Galvanic cell for the reaction given above
Answer:
AU(s)| AU³||CL,Cl2|Pt(s)
Explanation:
I started with the anode on my left hand side because AU id undergoing oxidation and on the right hand side CL is undergoing reduction hence it's a cathode, and since for the cathode we don't have a metal in a solid state we are going to add Pt
What will most likely cause a sudden wind to start blowing? Help ;-;
A. Clouds
B. Humidity
C. Precipitation
D. Air pressure
it is D. Air pressure!!! :)
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.
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
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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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:
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). **
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
cadmium metal reacts with a nickel (III) chlorate solution
what is the most important thing to know about the general term "discrepant event"?
Answer:
Discrepant events — demonstrations that produce unexpected outcomes — are used in science to capture students' attention and to confront their beliefs about a “phenomenon by producing an outcome which is contrary to what their previous experiences would lead them to believe is true” (Misiti, 2000, p.
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
Hope This Helped
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
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: