in digital signals, codes are used while in analogue signals do not use signals.
What are signals?Signals are defined as the instructions which are transferred to another source in other to deliver a message.
There are two types of signals which include the digital and analogue signals.
The digital signals uses codes which is a secret way of sending messages while analogue doesn't use codes.
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In an electroplating apparatus, where does the reduction reaction occur?
On the surface of the anode
On the surface of the battery
In the solution
On the surface of the cathode
Answer:
on the surface of the cathode
What is the speed of light written in standard numerical form?
If someone asked you to mix up a bag of ringers solution with 150 meq/l of na , 10 meq/l of k , 8 meq/l of ca2 , and 197 meq/l of mg2-, how many grams of mg2- would you add to the mixture?
The normality is the ratio of the equivalent to the volume of the solvent. To the mixture, 1.182 gms of magnesium should be added.
What is Normality?Normality (N) is the grams or moles of solute per liter of solution.
Magnesium has 2 valence electrons in the outermost shell so,
1 mEq of Mg⁻² ions = atomic number of Mg ÷ valence electron
= 12 ÷ 2
= 6 mg
In a liter solution having 197 meq/l of Mg⁻²:
197 meq/l of Mg⁻² × 6 = 1182 mg
Therefore, 1.182 gms of magnesium ions should be added to the mixture.
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For which process would the pictured cell be used?
Producing electricity
Splitting a compound into its elements
Purifying a metal
Coating a material with metal
Answer:
Coating a material with metal
(SInce the glasses will be coated with gold.)
Part g
consider the melting points of sugar and salt, as well as the states of sugar, salt, and oil
at room temperature. what can you conclude about the attractive forces between
particles in the three substances?
Salt and sugar have strong attractive forces whereas oil has weak attractive forces between particles.
What type of attractive forces present in salt, sugar and oil?The attractive forces between particles in the salt and sugar substances have strong because of its solid state while on the other hand, the attractive force between particles of oil is weak because of its liquid state.
So we can conclude that salt and sugar have strong attractive forces whereas oil has weak attractive forces between particles.
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The strength of the attractive forces between the molecule of oil, sugar and salt increases from oil to sugar to salt.
What is melting point of a substance?The melting point of a substance is the temperature at which the solid substance melts.
The melting point of a substance is a constant for a pure substance.
The higher the attractive forces between the molecules of a substance, the higher the melting point will be.
Between the three substances, oil has the lowest melting point while salt has the highest melting point.
Therefore, the strength of the attractive forces between the molecule of oil, sugar and salt increases from oil to sugar to salt.
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Why is it important to convert into units of kelvin before using the ideal gas law?.
Avogadro’s number is the number of particles in one mole of a pure substance, true or false?
Answer: The answer is true.
Explanation: Avogadro's number is a mole, which concludes that this statement is true.
How many particles would be found in a 12.7g sample of ammonium carbonate?
answer choices are:
2.9 x 10^22 particles
7.96 x 10^22 particles
i cannot get it, please help
multiplying terrorist to power 23, divided by 96. Multiplied by 12.7. so this is 76.48
7.96 x 10²² particles would be found in a 12.7g sample of ammonium carbonate. A particle is a tiny, localized item.
What is particles in chemistry?A particle is a tiny, localized item that may be defined by a number of physical or chemical characteristics, including volume, density, and mass. They range significantly in size or number from tiny particles like atoms to subatomic particles such as the electron.
Depending upon their density, particles can potentially be utilized to mimic even bigger things, such as moving celestial bodies or a throng of people. Although the meaning of the word particle is quite broad, different scientific disciplines might refine it as necessary. Any substance made up of particles is referred to as a particulate.
number of moles = given mass/ molar mass
= 12.7/ 96.08
= 0.13moles
number of particle= 0.13 × 6.022×10²³
= 7.96 x 10²²
Therefore, 7.96 x 10²² particles would be found in a 12.7g sample of ammonium carbonate.
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An example of polytamic anoin would be a. Ca+2 b. NH4+ c. F d. PO4-3
[tex]PO_4^{-3}[/tex] and [tex]NH^{4+}[/tex] are polyatomic anions composed of two or more atoms.
What is a polyatomic anion?A polyatomic ion is an ion composed of two or more atoms. Examples: The hydroxide cation ([tex]OH^-[/tex]) and the phosphate cation ([tex]PO_4^{3-}[/tex]) are both polyatomic ions.
[tex]PO_4^{-3}[/tex] and [tex]NH^{4+}[/tex] are the polyatomic anions because both contain more than 1 atom.
Hence,[tex]PO_4{-3}[/tex] and [tex]NH^{4+}[/tex] are polyatomic anions composed of two or more atoms.
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A base is a substance that can __________ a hydroxide ion.
Answer:
An Arrhenius base is a substance that dissociates in water to form hydroxide (OH–) ions. In other words, a base increases the concentration of OH– ions in an aqueous solution.
Indicate how the gas molecules move between the system and the surroundings based on changes in pressure, temperature, and volume and the number of moles.
The gas molecules move between the system and the surroundings follow PV=nRT.
What are molecules?The smallest particle of a substance has all of the physical and chemical properties of that substance.
An increase in pressure pushes the molecules closer together, reducing the volume. If the pressure is decreased, the gases are free to move about in a larger volume.
In the kinetic theory of gasses, increasing the temperature of a gas increases in average kinetic energy of the molecules, causing increased motion.
The reduction in the volume of the gas means that the molecules are striking the walls more often increasing the pressure, and conversely if the volume increases the distance the molecules must travel to strike the walls increases and they hit the walls less often thus decreasing the pressure.
At constant temperature and pressure the volume of a gas is directly proportional to the number of moles of gas. At constant temperature and volume the pressure of a gas is directly proportional to the number of moles of gas.
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An atom has eight protons and nine neutrons. draw the atomic structure of the atom
An atom has eight protons and nine neutrons. The atomic structure of the atom is attached below in image.
What is an atomic structure ?The term "atomic structure" describes the structure of an atom, which has a nucleus that contains both protons and neutrons . The centre of the nucleus is circled by the negatively charged electrons.
The smallest piece of ordinary matter within an element is called an atom. Protons, neutrons, and electrons are the three subatomic particle types that make up an atom.
An isotope's number is equal to the sum of its protons plus neutrons since their masses are almost identical. Oxygen 16 therefore has 8 protons and 8 neutrons, followed by oxygen 17 with 8 protons and 9 neutrons, and oxygen 18 with 8 protons and 10 neutrons.
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Pls show working too... thanks!!
The maximum volume of hydrogen evolved at room temperature and prressure after taking excess zinc with 0.01 mol HCl is 2.4 [tex]dm^{3}[/tex]
hence correct option is (C)
What is Ideal gas law ?According to this law, the product of the pressure and the volume of one gram molecule of an ideal gas is equal to the product of the absolute temperature of the gas and the universal gas constant.
Given Equation ;
Zn + 2HCl --> [tex]ZNCl_2[/tex] + [tex]H_2[/tex]
Given Quantities ;
Amount of Zinc = Excess
Amount of 1.0 mol/ltr HCl = 100 ml
It means, Number of moles of H = 0.1 mole
Temperature = 298 K
Pressure = 1 Atm
This is a “single state” problem, so we can solve it using the ideal gas law, PV = nRT.
therefore, using Ideal gas equation ;
PV=nRT
1 x V = 0.1 x 0.0821 x 298
volume of hydrogen gas = 2.4 litre ie, 2.4 [tex]dm^{3}[/tex]
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I-131 undergoes beta-minus decay. The chemical symbol for the new element is.
The chemical element that is formed when I-131 undergoes beta-minus decay is Xe.
What is a beta minus decay?A beta minus decay is one in which an electron is changed into a proton. The atomic number of the daughter nucleus will increase by one unit and is one place after the parent in the periodic table.
The chemical element that is formed when I-131 undergoes beta-minus decay is Xe.
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Why is there an energy crisis if energy is supposedly conserved? Explain your answer and cite one example
Answer:
Energy can neither be created nor destroyed, but it does change its form. And not all forms of energy are usable and it gets dissipated as heat energy and sound energy. The energy that is wasted cannot be recovered.
Help number 5 question
Answer:
In water, bases dissolve and provide hydroxide (OH-) to the surrounding solution. This lowers the acidity of the solution.
What happens when a solid is dissolved into a liquid?
O Solid particles float toward the surface layer of liquid particles.
O Solid particles sink down toward the bottom layer of liquid particles.
O Solid particles become evenly dispersed among liquid particles.
O Solid particles become suspended in the middle of liquid particles.
When a solid dissolves in a liquid to form a solution, solid particles become evenly dispersed among liquid particles.
What are solutions?Solutions are formed when a solute particle dissolves in another substance known as a solvent.
Usually, solutions are formed when solids dissolve in liquids.
The solid is the solute while the liquid is the solvent.
When a solid dissolves in a liquid, solid particles become evenly dispersed among liquid particles.
Therefore, solutions are formed when solute particles dissolve in solvents.
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Answer:
c
Explanation:
chem ed 2022
What happens when a solid is dissolved into a liquid?
Answer:
The solid has broken down into pieces so small that its particles spread all throughout the new mixture.
An element in Group 6A (16), period 3 would have which of the following properties?
An element in group 6A, period 3 with an atomic number of 16 would be brittle in nature.
BrittlenessBrittleness is the characteristic of a substance to break easily when hit with an object or against an object.
The element with the atomic number 16 is sulfur. Sulfur does not conduct heat nor electricity and neither can it be turned into wire.
Sulfur exists naturally as a brittle solid that is yellow in appearance.
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Why is it important for scientists to use common units such as the metric system?
A. so they can effectively communicate their findings
B. so they can double check their data
C. so they can form similar hypotheses
D. so they can conduct controlled experiments
Answer:
The correct answer is A, or "so they can effectively communicate their findings.
Explanation:
The metric system is the international system of weights and measures, which is used universally in the scientific community. Scientists benefit from the metric system so that they can communicate theories, ideas and most importantly data in a way everyone understands. It is virtually impossible to comprehend any modern, data-rich research in the natural or physical sciences without referring to the metric system and being able to contextualize the numbers and units it includes.
Please brainliest answer
I appreciate it :)
What is the molarity of 1. 5 liters of an aqueous solution that contains 52 grams of lithium fluoride.
Answer:
1.3 M
Explanation:
The formula mass of lithium fluoride is 7+19=26 g/mol. This means that in 52 grams of LiF, there is 2 moles.
Molarity = (moles of solute)/(liters of solution), so the answer is 2/1.5 = 1.3 M
The diagram below shows the geometric structure of the molecule of water H2O what do the symbols (the bigger gray circle) and (the smaller black circle) represent in the model?
1) genetic material
2) cells
3) chemical bonds
4) atoms
Answer:
Chemical bonds
Explanation:
Because it has an image of atoms being held together by chemical bonds.
how to Use your trend line to estimate the gas pressure of this system at 0°C.
Answer:
The slope of the trend line is 2.55; as the temperture.
Explanation:
Which lists only abiotic factors in this environment?
grass, tree, rock, soil
bird, turtle, grass, tree
sun, water, grass, soil
water, rock, soil, sun
In this case, among the list of components given, the abiotic factors are water, rock, soil, and sun.
What is an abiotic factor?An abiotic factor is a non-living part of an ecosystem that shapes its environment.
Biotic and abiotic factors make up a community via interaction.
Biotic factors are considered living things (having "life") while abiotic factors are simply non-living things.
Hence, in this case, among the list of components given, the abiotic factors are water, rock, soil, sun
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[tex] \begin{gathered}\\ \underline{\boxed{\large\leadsto\frak\red{ Answer :- }}} \\ \end{gathered}[/tex]
In this case, among the list of components given, the abiotic factors are water, rock, soil, and sun.What is an abiotic factor?
An abiotic factor is a non-living part of an ecosystem that shapes its environment.Biotic and abiotic factors make up a community via interaction. Biotic factors are considered living things (having "life") while abiotic factors are simply non-living things. Hence, in this case,♠ Among the list of components given, the abiotic factors are water, rock, soil, sun
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Can someone please help? This is super hard!!
Answer:
what is super hard?
Explanation:
what?
Which of the following is true for the equilibrium constant of a reaction? (5 pc
OIts value remains constant at different temperatures.
It is a ratio of coefficients of reactants to products.
It is represented by the symbol K.
Its value is always less than 1.
The equilibrium constant of the reaction is represented by the symbol K. Thus, option C is the correct and accurate statement about the equilibrium constant.
What is the equilibrium constant?The equilibrium constant is a representation of the concentration of the products and the reactants of the reaction that is raised to the powers through their stoichiometry coefficient.
Its value varies and changes at different temperatures and is not always less than 1. The equilibrium constant is the ratio of the coefficient of the products to reactants.
Therefore, option C. equilibrium constant is represented by K is true.
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Which type of scientist would most likely study how electricity could be
produced more efficiently?
Electrical engineers are the scientists that study the production of electricity more efficient.
Which type of scientist would study how electricity could be produced more efficiently?
Electrical engineers are the type of scientist that would most likely study how electricity could be produced more efficiently because they produced new technologies which are cost efficient as well as produce high amount of electricity.
So we can conclude that electrical engineers are the scientists that study the production of electricity more efficient.
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2H2O + 3HCl ——> 5H2O + Cl
how many moles of H2O are needed to make 3 moles of HCl?
Answer: 2 moles
Explanation:
We know from the equation that for every 3 moles of HCl consumed, 2 moles of water are consumed (based on the coefficients)
So, the answer is 2 moles.
If 0.094 moles of magnesium react with excess oxygen, how many moles of magnesium oxide would be formed?
The equation for this reaction is
[tex]\text{Mg}+\text{O} \longrightarrow \text{MgO}[/tex]
This means that for every mole of magnesium consumed, 1 mole of magnesium oxide is produced.
So, the answer is 0.094 moles.
Below is the thermochemical equation for the combustion of octane.
SC8H18(l) + 25O2(g) ⇒ 16CO2 (g) + 18H2O(l), ΔH= -10,941kj
How much heat is released during the combustion of 4 moles of octane (C8H18)
Question 5 options:
-21,882 kJ
-175,056 kJ
-2,735 kJ
-10,941 kJ
Impossible to answer this question with the information provided
-5,470.5 kJ
5mol produces -10.941KJ
4 mol let produces x KJ
Solve through proportion
5/-10.941=4/x5x=-43.764x=-43.764/5x=8.756 KJ5moles of octane produces -10941KJ
1mol of octane produces 2188KJ
4mol of octane produces
2188(4)8756KJ