Which of the following is true of alloys?Question options:A) They must contain a metal.B) They must be held together by chemical bonds.C) They're liquid solutions.D) They can only be composed of metals.
Answer
C) They're liquid solutions.
Explanation
An alloy is a mixture of metal with a second metal or other non-metal material. Airplanes, bicycles, and cooking pots are all usually made of different types of alloys. Examples of alloys include stainless steel, brass, bronze, brass, solder metal, pewter, and sterling silver.
Alloys can contain more than one metal so option A is not true.
Elements of an alloy do not combine through a chemical reaction. The mixing is generally done at a very high temperature where the elements and metals are melted, mixed, and left to cool; hence option B is not true.
Also, option D is not true because alloys are a mixture of metal with a second metal or other non-metal.
Hence, the best option is that all alloys are liquid solutions of metals and or other non-metals.
The correct answer is option C) They're liquid solutions.
Who can do it? in no time...............
Answer:
Which one ? can u put a question here?
Powdered zinc and sulfur react in an extremely rapid, exothermic reaction. The zinc sulfide that is formed can be used in the phosphor coating on the inside of a television tube.Zn(s) + S(s) → ZnS(s)A 6.00 g sample of Zn is allowed to react with 3.35 g of S. Determine the excess reagent and how many grams of it will remain after the reaction.Select one:a.Zinc, 0.407 gb.Sulfur, 0.407 gc.Zinc, 8.94 gd.Sulfur, 8.94 g
Since the reaction is 1:1, the limiting reactant is Zn and the excess reactant is S.
Mass in excess of S
[tex]\text{ mass = 32.07 g/mol * \lparen}\frac{3.35\text{ g}}{32.07\text{ g/mol}}-\frac{6\text{ g}}{65.4\text{ g/mol}}\text{\rparen = 0.4078 g S}[/tex]So the answer is option b sulfur 0.407 g
3.Two molecules of mercury oxide decompose into 2 molecules of mercury and 1 molecule of oxygen gas. Which of the following equations correctly describes this reaction?Select one:a. Ab. Bc. Cd. D
Answer
Explanation
If two molecules of mercury oxide decompose into 2 molecules of mercury and 1 molecule of oxygen gas, then the equation for the reaction is shown below
[tex]2HgO(s)\rightarrow2Hg(l)+O_2(g)[/tex]How much energy (Joules) is required to change 49.75 grams of liquid water from 95 Celsius to 105 Celsius?
The energy in Joules required to change 49.75 grams of liquid water from 95 Celsius to 105 Celsius is 2082.54J.
How to calculate energy?Energy is the ability to do work. The energy needed to heat a substance can be calculated using the following formula:
Q = mc∆T
Where;
Q = quantity of heat energy absorbed or releasedm = mass of substancec = specific heat capacity of water = 4.186 J/g°C∆T = change in temperatureAccording to this question, 49.75 grams of liquid water needs to be changed from 95 Celsius to 105 Celsius. The energy needed can be calculated as follows:
Q = 49.75 × 4.186 × (105 - 95)
Q = 2082.54J
Therefore, 2082.54J is the energy required to change the liquid water.
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Which of the following best describes how a filter can be used to sort materials?(1 point)
Responses Filters allow objects of a certain size to pass through, so if you know the size or size range of a certain component in a mixture, you can pass the entire mixture through a filter and sort out the component in that size range. Filters allow objects of a certain size to pass through, so if you know the size or size range of a certain component in a mixture, you can pass the entire mixture through a filter and sort out the component in that size range. Filters allow objects that are less than a specific size to pass through, which lets you sort a mixture. This assumes that the sizes of each component are different and do not overlap. Filters allow objects that are less than a specific size to pass through, which lets you sort a mixture. This assumes that the sizes of each component are different and do not overlap. Filters never help you sort mixtures because different components can all be the same or similar sizes. Filters never help you sort mixtures because different components can all be the same or similar sizes. Filters catch large objects, so filters can be used to sort out large components of mixtures.
Best describes how a filter can be used to sort materials is filters allow objects of a certain size to pass through, so if you know the size or size range of a certain component in a mixture, you can pass the entire mixture through a filter and sort out the component in that size range
Filtration can be defined as the mechanical or physical process used for the separation of one substance from another and such as solids, liquids, and gases, with the aid of an any medium and when the substances in a mixture have different particle sizes, they are separated by filtration and the mixture is poured through a sieve or filter and the smaller particles slip through the holes, but the larger particles do not
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3
Boat A and Boat B have the same mass. Boat A's velocity is three times greater than that of
B. Compared to the kinetic energy of Boat B, the kinetic energy of Boat A is
O one-third as much.
O three times as much.
six times as much.
O nine times as much.
Intro
✓
When Boat A and Boat B have the same mass, the kinetic energy of Boat A is 9 times the kinetic energy of Boat B.
What is kinetic energy?The energy that an object has because of its motion is called kinetic energy. We must apply a force to accelerate an object. Work is done in applying a force. After work has been done and energy is transferred to the object, then the object will be move with a new constant speed.
Let' m' be the mass of both boats A and B.
It is given in the question that velocity of Boat A is three times greater than that of Boat B. Let the velocity of boat B be X, Kinetic energy of boat A be K₁ and kinetic energy of boat B be K₂
Kinetic energy of Boat A is:
K₁ = 1/2 * (mV₁)^2
=1/2 * m *3X^2
=9(1/2*m*X^2)
Kinetic energy of Boat B is:
K₂ = 1/2 *m *V₂^2
=1/2* m* X^2
K₂ = 1/2*m*X^2
This implies that ,K₁ = 9* K₂
Kinetic energy of Boat A is 9 times the kinetic energy of Boat B.
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A gas in a cylinder with a moveable piston was placed in a heater and gained 5001 J of heat. If the volume increased from 345 mL to 1846 mL against an atmospheric pressure of 750 Torr during the process, what is the change in internal energy of the gas in the cylinder?
The change in internal energy of the gas in the cylinder is +5000.84989kJ.
What is energy?
Energy is described as the quantitative property that is transferred to a body or to a physical system or simply the ability to do work.
The given parameters include:
q = +5001J (gained is +)
P = 750Torr ( 1atm /760 (Torr) = 0.987atm
w = −PΔV
w = −0.987atm(1.846L − 0.345L)
w = −1.481L • atm (101.325J/1atm)
w = −150.11J = −0.15011kJ
we know that
ΔU = w + q
ΔU = 5001kJ − 0.15011kJ = +5000.84989kJ (The positive sign denotes that system increased in internal energy)
The first law of thermodynamics dealt on energy and explained that
Energy is conserved and under normal circumstances, the total amount of energy is constant. It is difficult to measure total energy within a system because there are so many different forms of energy, but we can measure energy changes.
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What stress would shift the equilibrium position of the following system to the left? N2O3(g) ⇌ NO(g) + NO2(g); ΔH is negativea.The forward reaction is exothermic.b.The backward reaction has a negative net enthalpy.c.The colorless gas has a higher enthalpy than the brown gas.d.The equilibrium between the two forms of the gas is disturbed at high temperatures.
Answer
Explanation
N2O3(g) ⇌ NO(g) + NO2(g); ΔH is negative
The reaction is exothermic (ΔH is negative), an increase in the temperature will force the equilibrium to the left, causing the system to absorb heat and thus partially offset the rise in temperature.
Therefore, the correct answer is:
d. The equilibrium between the two forms of the gas is disturbed at high temperatures.
How does the volume and mass of reactants affect the volume of products in a chemical reaction?
According to the Le Chatlier's Principle, an equilibrium system will adapt to a change in temperature, volume, or the quantity of molecules in a reactant or product in order to reestablish balance.
Describe molecules?The smallest unit of a substance that keeps its content and properties is a molecule, which is made up of two or more atoms linked together by chemical bonds. The building blocks of chemistry are molecules. A subscript with the atom count is placed after the element symbol to identify molecules.
Simple definition of a chemical reactionWhen two or more molecules interact to create a brand-new product, a chemical reaction takes place. Reacting substances are referred to as reactants, whilst newly created substances are referred to as products.
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need help with science
The correct descriptions of the terms in the periodic table are as follows:
Elements in the same group on the periodic table have the samenumber of valence electrons outside e- configuration in their e- notationElements in the same period on the periodic table have the samehighest main energy level in their e- notation electrons in the same block on the periodic table have the same last orbital in their e- notationionization energy - energy needed to remove an electronelectron affinity - energy change when an e- is addedelectronegativity - the ability of an atom to pull e-What is the periodic table?The periodic table is the table that arranges the elements in order of increasing atomic number into vertical columns called groups and horizontal rows called periods.
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If electrons jump from a lower energy shell to a higher energy shell, they are said to be
Answer:
When electron jumps from lower energy orbit to higher energy orbit, energy is absorbed to make transition from lower energy orbit to higher energy orbit.
Explanation:
Calculate the grams of lead (III) iodide that can be produced from 5.00 moles of potassium iodideI picked A but I’m not sure if it’s correct
Explanation:
The question gives us the following reaction:
Pb(NO3)2 + 2 KI ---> PbI2 + 2KNO3
The equation tells us that 2 moles of potassium iodide (KI) produce 1 mole of lead(II) iodide (PbI2).
So:
2 moles KI ---- 1 mole PbI2
5 moles KI ---- x moles
x = 2.5 moles
Now let's transform 2.5 moles of PbI2 into grams:
m = n*MM
MM of PbI2 = 461 g/mol
m = 2.5*461 = 1,152.5 g
Answer: alternative "D" 1.15 x 10^3 g
How many seconds are in72 milliseconds?Give your answer in standard form.Ent
1) Convert milliseconds to seconds.
1 s = 1000 ms
[tex]s=72\text{ }ms*\frac{1\text{ }s}{1000\text{ }ms}=0.072\text{ }s[/tex]72 ms is equal to 0.072 s.
Ionic and covalent bonds help arrange atoms into unique structures for proteins like hemoglobin. Why is this necessary?
Responses
The structure of the protein allows it to carry out whatever function is needed the most.
The structure of the protein allows it to carry out whatever function is needed the most.
The bonds help hold the protein together but are unrelated to the function.
The bonds help hold the protein together but are unrelated to the function.
The ionic bonds alone in a protein help determine its function.
The ionic bonds alone in a protein help determine its function.
The structure of a protein allows it to carry out its unique function.
The structure of a protein allows it to carry out its unique function.
The reason why the Ionic and covalent bonds help arrange atoms into unique structures for proteins like hemoglobin is that the structure of a protein allows it to carry out its unique function.
What is the covalent bond?The covalent bond is the kind of bond that exists between two atoms in which the electrons between the two atoms are shared. The electrons cloud of the bond lies between the two atoms. For the ionic bond, there is a transfer of the electrons from one atom to another. We ought to note that the transfer is often from the metal to the non metal.
On the other hand, it should be noted that there are various kinds of bonding that are important to be able to keep the structure and the function of the protein. Aside from the covalent bonds that holds the atoms together, the ionic bonds could also be involved in the dipolar interactions that are responsible for the secondary structure of the protein.
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B. The structure of a protein allows it to carry out its unique function.
ur welcum
What is the molarity of Na3PO4 when 1.7 moles of are dissolved in a 2.8 L solution? Be sure to include the proper abbreviation for the Units
Molarity or molar concentration is a measure of the concentration of a chemical species, of a solute in a solution, using as units, number of moles, and volume in liters. The formula for Molarity is:
M = n/V
Where:
n = number of moles, 1.7 moles
V = volume in Liters, 2.8 Liters
Now we add these values into the formula:
M = 1.7/2.8
M = 0.61
The Molarity is 0.61 M
Calculate the pH of an aqueous solution that is 0.200 mol L-1 in NH3 and 0.300 mol L-1 in NH4Cl.
Kb(NH3) = 1.8 x 10-5
The pH of an aqueous solution that is 0.200 mol/L in NH₃ and 0.300 mol/L in NH₄Cl is 7.9.
We will use Henderson-Hasselbalch equation to calculate the pH. It is given by -
pH = pKa + log [base]
[acid]
We know that,
base is NH₃
acid is NH₄⁺
we will calculate molarity as-
NH₃ : 0.200/2 = 0.1 M
NH₄⁺ : 0.300/2 = 0.15 M
Now, we will find pKa by -
Kw = Ka . Kb
Ka = 1 x 10⁻¹⁴
1.8 x 10⁻⁵
Ka = 5.5 x 10⁻¹⁰
pKa = -logKa
pKa = 9.25
Substituting the values in equation,
pH = 9.25 + log [0.1]
[0.15]
pH = 7.9
Therefore, the pH is found to be 7.9.
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Why is glass useful for making eyeglasses?
OPTIONS
Glass is fragile yet strong.
Glass changes characteristics depending on how it is cooled.
Glass shaped into a lens can bend light that passes through it.
Glass coated with aluminum or silver reflects light.
Answer: Glass is see through
Explanation:
Answer: Glass shaped into lens can bend light that passes through it
A healthy eye focuses light directly on the retinaWhen a person's eyesight becomes poor the eye focuses light behind or in front of the retina2 Conditions- Hyperopia (far-sightedness) : When the eye focuses light behind of the retina.
- Myopia (near-sightedness): When the eye focuses light in front of the eye.
A lens can be created to help correct such issuesLenses will correct bend in light back directly onto the retina
what have the prescriptions of painkillers cost Americans? How does this compare to the
benefits of pain relief? How should scientists direct their research about chronic pain in the future?
Answer:
The CDC estimates the total economic burden of prescription opioid misuse in the United States is $78.5 billion a year.
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Which analogy best describes theories?
Theories are like rocks because they can change but not easilly.
Theories are like tides because they frequently go back and forth.
Theories are like time because they are eternal and never change.
Theories are like clay because they can be molded to fit changing opinions.
The analogy that best describes theories is that theories are like clay because they can be molded to fit changing opinions.
A theory is a thorough explanation of a scientific phenomenon that incorporates laws, hypotheses, and facts. For example, the gravitational field hypothesis explains why fruits fall from trees and astronauts float in space. A theory can be related to a clay as it can be moulded as per the observations. The more observations a theory anticipates, the more tests it passes, and the more facts it explains, the longer its core premises hold true.
A theory should be consistent with new data. If not, the theory is changed or abandoned. The more observations a theory anticipates, the more tests it passes, and the more facts it explains, the longer its core premises hold true.
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PLEASE HELP ASAP.
What conditions are being experienced
by an observer in Florida when the moon
is at Position 2?
When the moon is at point 2, it will be covering Florida, which will cause some areas of the earth to be dark while others will be light.
What is Earth known for?Earth, the third planet from the sun, is the only place in the known cosmos where the presence of life has been established. With a 3,959-mile radius, Earth is the fifth-largest planet in our solar system and the only one whose surface is known to have liquid water. Moreover, the names given to Earth are distinctive.
What are 8 facts about Earth?Earth is not flat, but it's not perfectly round either. The days are getting longer. There weren't always several continents. Earth's icy times. The driest place on Earth. Earth's gravity isn't uniform. In the past, sea levels were very different. Our sun has a voracious appetite.To know more about Earth visit:
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Use the data below to calculate ΔH°rxn for the reaction MgO(s) + CO2(g) à MgCO3(s).
ΔH°f: MgO(s) = -602 kJ mol-1
, CO2(g) = -394 kJ mol-1 and MgCO3(s) = -1096 kJ mol-
The ΔH°rxn for the reaction MgO(s) + CO2(g) à MgCO3(s) is -100. kJ mol-1.
What is enthalpy ?
Enthalpy is a property or state function that resembles energy; it has the same dimensions as energy and is therefore measured in joules or ergs. The value of enthalpy is solely dependent on the temperature, pressure, and composition of the system, not on its history.
Using ΔH° = ∑ΔfH°(products) – ∑ΔfH°(reactants), the enthalpy change is:
ΔH° = ΔfH°(MgCO3(s)) – [ΔfH°(MgO(s)) + ΔfH°(CO2(g))]
= (-1096 – [-394 -602]) kJ mol-1
= -100. kJ mol-1
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Using the glucose data in Document A and the balanced equation for photosynthesis inDocument B, calculate how much oxygen the plant made in one day.
The plant made in one day 0.54 moles of oxygen.
From the balanced equation for photosynthesis, we know that 6 moles of oxygen are produced when 1 mole of glucose is produced at the same time.
So, to calculate the amount of oxygen that a plant made in one day when it produced 0.090 moles of glucose, we can use a mathematical Rule of Three:
[tex]\begin{gathered} 1\text{mol Glucose}-6\text{mol Oxygen} \\ 0.090\text{mol Glucose-x=}\frac{0.090\text{mol Glucose}\cdot6\text{mol Oxygen}}{1\text{mol Glucose}} \\ x=0.54\text{mol Oxygen} \end{gathered}[/tex]Finally, the plant made in one day 0.54 moles of oxygen.
I have pressure of 65 kPa and starting temperature of 25°C. If I raise the temperature to 167°C, what is the new pressure? (Equation: K= 273 +°CO 90 KPaO 100 kPaO 96 kPaO 97 kPa
96kPa. Option C is correct
Explanations:
According to Gay Lussac's law, the pressure of a given mass of gas is directly proportional to the temperature provided that the volume is constant. Mathematically:
[tex]\begin{gathered} P\alpha T \\ P=kT \\ k=\frac{P_1}{T_1}=\frac{P_2}{T_2} \end{gathered}[/tex]Substituting the given parameters to determine the new pressure P2
[tex]\begin{gathered} P_2=\frac{P_1T_2}{T_1} \\ P_2=\frac{65\times(167+273)}{(25+273)} \\ P_2=\frac{65\times440}{298} \\ P_2=\frac{28600}{298}=95.97kPa \\ P_2\approx96kPa \end{gathered}[/tex]Therefore the new pressure is 96kPa
How many liters of solution will be produced when diluting 1.65 L of a 0.432 M KI solution to 0.212 M KI?
All questions where they ask you about concentration or volume of a solution prepared with another solution can be solved using the following equation:
[tex]C_1V_1=C_2V_2[/tex]Where C1 is the concentration of the first solution, V1 is the volume of the first solution, C2 is the concentration of the second solution and V2 is the volume of the second solution. You only need to be careful to use the rigth units.
This particular question ask for the Volume of the second solution, V2. Then we need to solve for V2 in the previous equation:
[tex]V_2=\frac{C_1V_1}{C_2}=\frac{0.432\text{ M}\times1.65L}{0.212M}=3.36L[/tex]Calculate the number of atoms contained in 0.68 moles of Al (CN)3
4.094*10^23 moles of Al(CN)3
1 mole = 6.022*10^23 atoms
0.68 moles = x atoms
x = 4.094*10^23 atoms of Al(CN)3
How do I go about properly solving this question?
The percent abundance of the cannellini beans in this sample is : 18.8 %
The average weighted = 1.9 g
M1 = mass of black eyed peas = 1.3
M2 = mass of cannellini = 2.9
x = % abundance
weighted average is given = 1.9 g
applying the formula :
M1x + M2 (1-x) = average weighted
1.3 × x + 2.9 (1-x) = 1.9
x = 0.812
% abundance of black eyed peas = 81.2 %
% abundance of cannellini beans = (1-0.812) = 0.188 = 18.8 %
Thus, The percent abundance of the cannellini beans in this sample is : 18.8 %
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What is the number of moles in 825l of he gas at stp?
Answer:
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A vessel, divided into two parts by a partition, contains 4 mol of nitrogen gas at 5°C and 30 bar on one side and 2.5 mol of argon gas at 1°C and 20 bar on the other. If the partition is removed and the gases mix adiabatically and completely, what is the change in entropy? Assume nitrogen to be an ideal gas with CV = (5/2)R and argon to be an ideal gas with CV = (3/2)R.
If the partition is removed and the gases mix adiabatically and completely, the change in entropy is equal to 263 K.
What is entropy?
The measure of a system's chaos is called entropy. It is an extensive property of a thermodynamic system, which means that the amount of matter in the system affects how much it is worth. Entropy is frequently represented in equations by the letter S and is measured in joules per kelvin (JK%-1) or kg/m^2/s^-2K^-1. The entropy of a highly ordered system is low.
Lets assume nitrogen is an ideal gas with CV=5R/2
and assume argon is also an ideal gas with CV=3R/2
n₁=4 moles
n₂=2.5 moles
t₁ = 5°C, in kelvin t₁= 5+273
t₁ = 278 K
t₂=1°C, in kelvin t = 1+273
t₂= 273 K
u=пCVΔT
U(N₂)+U(Ar)=0
putting values:
4x(5R/2)x(T(final)-278) = 2.5x(3R/2)x(T(final)-273)
by simplifying:
T(final) = 263K
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How much water isneeded to make a1.5 M solution using44 grams of CaCO3?
The first step we have to follow to answer this question is to convert the given mass to moles using CaCO3 molar mass:
[tex]44gCaCO_3\cdot\frac{1molCaCO_3}{100.1gCaCO_3}=0.44molCaCO_3[/tex]Now, use the following formula to find the volume of water needed to prepare the solution:
[tex]\begin{gathered} molarity=\frac{molesofsolute}{litersofsolution} \\ 1.5M=\frac{0.44mol}{L} \\ L=\frac{0.44mol}{1.5M} \\ L=0.29L \end{gathered}[/tex]It means that 0.29L are needed.