The correct answer is ionic radii increase.
The ionic radii decrease as one move across the periodic table, that is, from left to right, while the ionic radius increases as one move from top to bottom on the periodic table. As one moves down a group in the periodic table, the supplementary layers of electrons are being added that usually results in the increase of the ionic radius as one moves down the periodic table.
How does the equilibrium change with the removal of hydrogen (H2) gas from this equation? 2H2S ⇌ 2H2(g) + S2(g)
A. Equilibrium shifts right to produce more product.
B. Equilibrium shifts left to produce more reactant.
C. Equilibrium shifts right to produce less product.
D. Equilibrium shifts left to produce less reactant.
Answer : The correct option is, (A) Equilibrium shifts right to produce more product.
Explanation :
According to the Le Chatelier's principle, when we are adding or removing the products or reactants from the reaction, the equilibrium will shift towards that side where the less number of molecule.
The given equilibrium reaction is,
[tex]2H_2S\rightleftharpoons 2H_2(g)+S_2(g)[/tex]
In the given reaction, when we are removing the hydrogen gas from the reaction then the equilibrium will shift towards the right side to produce more product.
Hence, the correct option is, (A)
( 20 points ) Jerri is planning to rebuild the engine of an antique car. She has chosen all the materials she needs including a high quality synthetic oil to reduce friction in the engine. What effect will reducing friction have on the engines performance?
A Reduces friction means reduced efficiency
B Reduces friction means reduced heat transfer
C Reduces friction means increased efficiency
D Reduces friction means increased heat transfer
The option, B. Reduced friction means reduced heat transfer " is correct.
Answer:
Reduces friction means increased efficiency
Explanation:
Friction is known to decrease efficiency in machines. In redesigning the engine if the antique car, and the inclusion of oil to reduce friction in the engine, she aims to improve the efficiency of the engine.
Friction leads to lost work in mechanical systems. Friction accounts for the fact that the efficiency of an engine is never 100% since some of the input work is lost as friction.
Hence decreasing the friction improves the efficiency of the machine.
In an experiment, 0.6mol of chlorine gas, Cl2, is reacted with an excess of hot aqueous sodium hydroxide. One of the products is a compound of sodium, oxygen and chlorine. Which mass of this product is formed?
A 21.3 B 44.7 C 63.9 D 128
Answer: B) 44.7 g
Explanation:
The equation represent the reaction is
Cl2 + 2NaOH → NaCl + NaClO + H2O
The balanced equation shows that every mole of Cl2 reacts to produce mole of NaClO
0.6 mole of Cl2 will produce 0.6 mole of NaClO
n = mass/molar mass
molar mass of NaClO = 74.5 g/mol
the mass of NaClO = n x molar mass = (0.6 mole) (74.5 g/mol) = 44.7 g
Place the items in order from the largest wavelength to the shortest wavelength.
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Blue visible
Gamma radiation
Green visible
Infrared
Microwave
Orange visible
Radio wave
Red visible
Ultraviolet (UV)
Violet visible
X-ray
Yellow visible
The order from longest to shortest wavelength is;
Radio wave (longest wavelength)
Microwave
Infrared
Red visible
Orange visible
Yellow visible
Green visible
Blue visible
Violet visible
Ultraviolet (UV)
X-ray
Gamma radiation (shortest wavelengths)
This is referred to as the electromagnetic spectrum.
The EM radiation types ordered from largest to shortest wavelength are: Radio wave, Microwave, Infrared, Red visible, Orange visible, Yellow visible, Green visible, Blue visible, Violet visible, Ultraviolet (UV), X-ray, and Gamma radiation.
To place the various types of electromagnetic (EM) radiation in order from largest wavelength to shortest wavelength, we'll refer to the relationship between wavelength, frequency, and energy of EM waves. As the wavelength decreases, both the frequency and energy increase. Here's the correct order from largest to shortest wavelength:
Radio waveMicrowaveInfraredRed visibleOrange visibleYellow visibleGreen visibleBlue visibleViolet visibleUltraviolet (UV)X-rayGamma radiationWithin the visible light spectrum, remember ROY G BIV as a mnemonic to order the colors from longest (red) to shortest (violet) wavelengths. Beyond the visible spectrum, infrared radiation has longer wavelengths than visible red light, whereas ultraviolet light, X-rays, and gamma rays have shorter wavelengths than visible violet light.
Which two particles can form an ionic bond with each other?
A. a negative oxygen ion and a negative chlorine ion
B. a positive sodium ion and a positive magnesium ion
C. a positive calcium ion and a negative oxygen ion
D. a neutral fluorine atom and a negative sulfur io
Answer : The correct option is, (C) a positive calcium ion and a negative oxygen ion.
Explanation :
Ionic compound : ionic compounds are the compounds which are made up of positively charged cation and the negatively charged anion. The bond form between the cation and anion is known as ionic bond.
For example : NaCl, LiF, NaBr, etc.
In option C, a positive calcium ion combine with a negative oxygen ion to give calcium oxide. So, these two particles can form an ionic bond with each other.
While the other options A, B and D can not form an ionic bond with each other.
Therefore, the correct option is C.
Describe how light is emitted from an atom. A) As protons absorb energy they travel from the nucleus through the atom emitting light along the way. B) The light is emitted when energy from sunlight is absorbed by the atom to excite a neutron into a higher level. C) When the nucleus absorbs sunlight, photons are energized and move to a higher energy level and are then released. D) Light is emitted from an atom as an electron falls from an excited state to the ground state releasing a photon.
Answer is: D) Light is emitted from an atom as an electron falls from an excited state to the ground state releasing a photon.
Electrons can jump from one energy level to another, absorbing or emitting electromagnetic radiation with a frequency ν (energy difference of the levels).
When electron jump from higher to lower energy level (shell), it emitting (releasing) energy.
For example, when the electron changes from n=4 (fouth shell) to n=2 (second shell), the photons are emitted.
Albert Einstein (1879-1955) proposed that a beam of light is a collection of discrete wave packets (photons) with energy hν, where h is Planck constant and ν is frequency.
The photons have a characteristic energy proportional to the frequency of the light.
Minimum frequency or the threshold frequency is energy below which no photoelectrons are emitted.
Above the minimum frequency, energy depends on the frequency of the light, not on the intensity of the light.
Hydrogen gas can be made by reacting methane (CH4) with high temperature steam: CH4(g) + H2O(g) ---> CO(g) + 3H2(g)
How many hydrogen molecules are produced when 256 grams of methane reacts with steam? Please SHOW WORK so I can understand the concept
CH4(g) + H2O(g) ---> CO(g) + 3H2(g)
mass of methane CH4 = 256g
molar mass of methane,CH4 = C + 4 H = 16.04g/mol
moles of CH4
= mass/Molar mass
= 256/16.04
= 15.96 moles CH4
moles of H2 produced
= 15.96 moles CH4 x 3 moles H2
1 mol CH4
= 47.88 moles H2
number of H2 molecules produced here
= 47.88 moles H2 x 6.022 x 10²³ molecules
1 mole
= 288.335 x 10²³ H2 molecules
= 2.88 x 10²⁵ H2 molecules
2.88 x 10²⁵ H2 molecules are produced when 256g of methane reacts with steam.
Question 1(Multiple Choice Worth 4 points) (04.05 LC) What is the oxidation number of manganese in MnO41−? +3 +4 +7 +8 Question 2(Multiple Choice Worth 4 points) (04.05 LC) Which of the following reactions could be used to power a battery because of the transfer of electrons? Pb22+ + 2Br− → PbBr CaCl2 + 2NaOH → Ca(OH)2 + 2NaCl KOH + HCl → KCl + H2O Zn + Cu2+ → Zn2+ + Cu Question 3(Multiple Choice Worth 4 points) (04.05 MC) Read the following chemical equation: 2Al + 3Br2 → 2AlBr3 Which statement best identifies and describes the oxidizing agent in the reaction? Al is the oxidizing agent because its oxidation number increases. Al is the oxidizing agent because its oxidation number decreases. Br2 is the oxidizing agent because its oxidation number increases. Br2 is the oxidizing agent because its oxidation number decreases. Question 4(Multiple Choice Worth 4 points) (04.05 MC) In which of the following reactions is chlorine (Cl) oxidized? Br2 + 2Cl− → Cl2 + 2Br− Cl2 + 2e− → 2Cl− 2ClO3− + 12H+ → Cl2 + 6H2O 2Na + Cl2 → 2NaCl Question 5(Multiple Choice Worth 4 points) (04.05 MC) The diagram shows the setup of an experiment. A few observations of the experiment are listed in the table below the diagram. A beaker filled three-fourths with a liquid labeled colorless silver nitrate solution is shown. A small strip is shown inside the beaker. The strip is labeled copper strip. The title of the image is Experimental Setup. Experimental Observations Observation Description 1 Solution turned blue 2 Gray particles were deposited on the edge of the strip Which of the following is the correct explanation for one of the given observations? Observation 2 is a result of nitrate ions moving into the solution. Observation 1 is a result of copper ions moving into the solution. Observation 1 is a result of silver atoms losing one electron. Observation 2 is a result of silver ions losing one electron.
1) Answer is: the oxidation number of manganese in MnO₄⁻ is +7.
Permanganate anion has negative charge 1-.
Oxygen (O) in permanganate anion has oxidation number -2.
x + 4 · (-2) = -1.
x - 8 = -1.
x = +7; oxidation nzmber of manganese.
Oxidation number shows the degree of oxidation of an atom in a chemical compound.
2) Answer is: Zn + Cu2+ → Zn2+ + Cu.
In this chemical reaction, there is transfer of electrons from zinc (Zn) to copper (Cu). Zinc change oxidation number from 0 to +2 (lost electrons) and copper change oxidation number from +2 to 0 (gain electrons).
Oxidation half reaction: Zn⁰ → Zn²⁺ + 2e⁻.
Reduction half reaction: Cu²⁺ + 2e⁻ → Cu⁰.
In other chemical reactions, there is no change of oxidation number of elements.
3) Answer is: Br2 is the oxidizing agent because its oxidation number decreases.
Balanced chemical reaction: 2Al + 3Br₂ → 2AlBr₃.
In this chemical reaction, aluminium change oxidation number from 0 to +3 (lose electrons) and bromine change oxidation number from 0 to -1 (gain electrons, reduced).
Oxidizing agent is a substance that has the ability to oxidize other substances, to cause them to lose electrons.
In oxido-reduction reaction, at least one element lose and one element gain electrons.
4) Answer is: Br2 + 2Cl− → Cl2 + 2Br⁻.
Oxidation is increase of oxidation number.
In this balanced chemical reaction, chlorine change oxidation number from -1 (Cl⁻) to oxidation number 0 (Cl₂).
Oxidation half reaction: 2Cl⁻ → Cl₂⁰ + 2e⁻.
Reduction half reaction: Br₂ + 2e⁻ → 2Br⁻.
In other chemical reactions, chlorine is reduced.
5) Answer is: Observation 1 is a result of copper ions moving into the solution.
The reactivity series is a series of metals from highest to lowest reactivity. Metal higher in the reactivity series will displace another.
Copper (Cu) is higher in activity series than silver (Ag), so copper lose electron and silver gain electrons.
Copper is oxidized (increase of oxidation number) and silver is reduced.
Answer:
There's no one-upping that one so I'll just tell you that they were right on my test :)
Explanation:
you're welcome
When Mrs. Green describes the physical properties of matter she said that physical properties often concern changes in state. One physical property that does not describe a change in state is
Some physical properties of matter do not involve a change in state. An example is density, which is an intensive property that does not depend on the amount of matter. It remains consistent regardless of the state of the substance.
Explanation:Physical properties of matter are characteristics that can be observed without changing the chemical composition of the substance. These properties can often describe changes in state, such as from a solid to a liquid (melting) or a liquid to a gas (boiling). However, there are also other types of physical properties that do not involve a change in state.
One of these physical properties is density. Density does not involve a change in the state of a substance. It is an intensive property, meaning it does not depend on the amount of matter present. It is determined by the mass of an object divided by its volume, and it remains the same regardless of the quantity of the substance you have.
Therefore, Mrs. Green could have been referring to a property like density when she mentioned a physical property that does not describe a change in state.
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Physical properties are characteristics of matter that don't involve a change in the composition of matter. One example is density, which isn't tied to a change of state. Other physical properties include hardness, color, smell, boiling point, and solubility.
Explanation:When Mrs. Green discusses the physical properties of matter, she is referring to characteristics of matter that are not associated with any change in its chemical composition. Physical properties, such as hardness and boiling point, do not involve a change in the composition of matter, hence they do not correspond to a change of state. An example is the density of a material which remains the same regardless of its state (solid, liquid, or gas). Density is therefore a physical property that does not describe a change in state. Other examples can include color, smell, freezing point, boiling point, and solubility.
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The elements X and Y combine in different ratios to form four different types of compounds: XY, XY₂, XY₃, and XY₄. Consider that there is enough of each sample to contain 2 g of X, and the mass of X is estimated to be 2 g and the mass of Y is estimated to be 4 g.
Arrange the following ratios in order of their increasing value. (The exercise gives me three tabs to put in order from highest to least. These are in the pic)
Rank from highest to lowest ratio. To rank items as equivalent, overlap them.
I put XY₄ as highest, then XY₃ in the middle, and XY₂ as lowest. Is this order correct? I'm not quite understanding this lesson :// so if i could also get some sort of an explanation, that'd be great!!
Yeah, it would be that order since if XY was a number, you would multiply it by that number 4 total times. So it would be a large number. And then it gets smaller and smaller when it gets to XY2. So yeah you got the order correct.
Elements are species of atoms that are defined and characterized by the number of protons. The multiple proportions of the element from higher to lowest are XY₄, XY₃, and XY₂.
What are elements?Elements have been defined as the atomic species that make the molecule and the compounds by combining chemically through bond formation. They are indivisible particles that cannot be broken further.
When two or more elements chemically links then a compound or molecule is formed like element X and Y combined in various ratios and proportions to form XY, XY₂, XY₃, and XY₄.
The highest ratio of the proportions will be XY₄ as it has one X and four Y elements, followed by XY₃ with one X and three Y. Lastly XY₂ will be the lowest ratio as it has one X and two Y elements.
Therefore, the order is XY₄> XY₃ > XY₂.
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What is the systematic name of the following compound?
(1 point)
Li2SO3
Lithium Sulfate
Lithium Sulfite
Lithium (II) Sulfide
Sulfurous Lithium
A 1.00 g sample of a hydrogen peroxide (H2O2) solution is placed in an Erlenmeyer flask and diluted with 20 mL of 1 M aqueous sulfuric acid. To this solution is added 0.0200 M KMnO4 solution via a buret, until a pale purple color persists. This requires 22.50 mL of KMnO4 solution. What is the percent by mass of hydrogen peroxide in the original solution? (A) 0.613% (B) 1.53% (C) 3.83% (D) 7.65%
What method can be used to to completely separate a solution containing alcohol and water?
Answer:
Fractional Distillation
Explanation:
Fractional distillation is a type of separating technique used to separate constituents of a mixture (miscible) with varying boiling points. In fractional distillation, heat is applied to the mixture and the constituent with the least boiling point vaporizes out first, then the one with the next boiling point follows (the jars used to obtain the constituents will be changed at different boiling points) and the one with the highest boiling point is obtained last. Alcohol/ethanol has a boiling point of 78°C while water has a boiling point of 100°C hence after exposure to heat, ethanol evaporates out first (and then cooled outside the distilling flask; in a condenser, so it can be converted back to liquid). Since we have just two constituents in this mixture, only water will be left in the distilling flask at about 85°C.