Answer: amt of time students studied
Explanation:
Describe one way that electromagnetism can be observed.
Answer:
It is observed in various ways;
- Through electromagnetic waves:
Gamma rays, x-rays, ultraviolet rays and visible light are all electromagnetic.
- In electromagnetic devices
For example in motors and generator.
I'll describe that in a motor
Description;
When electric current is applied to the hair coils of the motor, it moves in direction according to Flemings hand rule.Through laws of induction, and emf is induced in a coil hence producing magnetic fields which move the coil continuously .[tex].[/tex]
Why is the application of heat or a surface-active agent not required during the application of the counterstain in acid-fast staining?
The application of heat or a surface-active agent not required during the application of the counterstain in acid-fast staining because "The dye is driven into the cytoplasm as well as lipoidal wall by heat.
A surface active agent, also known as a surfactant, is just an element that is positively adsorbed at the liquid-vapor interface as well as other interfaces and lowers the surface tension of something like the medium in which it was dissolved and also the interfacial tension with some other phases.
Carbolfuchsin was employed as the primary stain. Heat, as well as phenol, as well as phenol, is then administered to the cells to help the blemish penetrate the waxy surface of such acid-fast microorganisms.
In order for the stain to permeate the mycobacteria's cell wall, the wetting ingredient territory lowers the surface tension separating them.
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If more solute is added to a solvent, more than is able to dissolve at a given temperature, a(n)?
If more solute is added to a solvent, more than is able to dissolve at a given temperature, a(n) equilibrium will be established between dissolved and undissolved solute.
What is an equilibrium ?A condition of an item known as equilibrium is one in which two or more opposing forces, whether internal, external, or a combination of both, act on it and cancel one another out to maintain the object in the same state as before. The Latin word libra, which meaning weight or balance, is the word's etymological ancestor.
Here are a few instances of equilibrium:
A book that is open and at resta vehicle which is driving at a steady speeda chemical process where the rates of the forward and reverse reactions are equalLearn more about equilibrium
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Explain two events: (1) placing a hot
pack on your skin and making your skin feel warmer, and (2) placing a cold pack
on your skin and making your skin feel colder
9) Which compound is ionic?
a. CO2
b. H2O
c. KCl
d. SCl2
1. How many doliars are in 45 pesos?
Answer:
2.21
Explanation:
Fe + O2 → Fe203
What should the coefficient for the diatomic oxygen
(O₂) be when this equation is correctly balanced?
whats a chemical reaction
Which statement best describes a benefit of conducting a comparative investigation over collecting data from the Internet? A comparative investigation can be repeated in a short time while collecting the continuous data from the Internet takes longer. Conducting a comparative investigation is always less expensive than an investigation in which data is obtained from the Internet. Conducting a comparative investigation is always less time consuming than obtaining data from the Internet. A comparative investigation can provide a wider range of data than can be obtained from the Internet.
Conducting a comparative investigation is always less expensive than an investigation in which data is obtained from the Internet.
Information theory and efforts to construct and connect computer networks that were the result of American research and development and international collaboration, particularly with scholars in the United Kingdom and France, are at the root of the history of the Internet.
In the late 1950s, The Internet field of computer science was just beginning to take time-sharing among computer users into account. Later, Internet explored if this could be done across wide area networks. Independently, Donald Davies developed packet switching at the National Physical Laboratory (NPL) in 1965 and proposed a national commercial data network in the UK. Paul Baran proposed a dispersed network based on data in message blocks in the early 1960s.
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Calculate the density of Freon 12, CF2Cl2, at 30. 0 °C and 0. 954 atm.
[R=0. 08206 L atm/mol K] [CF2Cl2=120. 91g/mol]
By ideal gas approximation, the density of freon is 4.604 g/L.
We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation
P . V = n . R . T
where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.
using the density of gas
P . V = n . R . T
P . V = gr / Mr . R . T
P . Mr = gr / V . R . T
P . Mr = ρ . R . T
where ρ is density and Mr is the molar mass
From the question above, we know that
T = 30⁰ C = 303 K
P = 0.954 atm
R = 0. 08206 L atm/mol K]
Mr = 120
By substituting the given parameters, we get
P . Mr = ρ . R . T
ρ = P . Mr / (R . T)
ρ = 0.954 . 120 / (0.08206 . 303)
ρ = 4.604 g/L
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Attenda
Young green sea turtles often eat jellyfish. After the
sea turtle swallows this jellyfish, the sea turtle's
esophagus will move the jellyfish into the stomach.
Which statements about the stomach are true? Select all that apply.
Most nutrient particles are absorbed by tiny blood vessels in the stomach.
The stomach can store partially digested food.
After food leaves the stomach, it enters the small intestine.
The stomach produces digestive chemicals that break down food.
Explanation:
after the food leaves the stomach it enters the small intestine
Answer:
after the food leaves the stomach it enters the small intestine
Explanation:
state the law of definite proportions and explain.
Answer:
According to the Law of Definite Proportions, a chemical compound will always include the same weight proportions of each element, regardless of the quantity or source.
Explanation:
For instance, 21.5 grams of carbon and 28.5 grams of oxygen make up a 50-gram sample of carbon monoxide.
Answer: The law of definite proportions states that a given chemical compound always contains the same elements in the exact same proportions by mass
Explanation: The discovery that mass was always conserved in chemical reactions was soon followed by the law of definite proportions, which states that a given chemical compound always contains the same elements in the exact same proportions by mass. As an example, any sample of pure water contains 11.19% hydrogen and 88.81% oxygen by mass. It does not matter where the sample of water came from or how it was prepared. Its composition, like that of every other compound, is fixed.
Another example is carbon dioxide. This gas is produced from a variety of reactions, often by the burning of materials. The structure of the gas consists of one atom of carbon and two atoms of oxygen. Carbon dioxide production is of interest in many areas, from the amount we breathe to the amount of the gas produced by burning wood or fossil fuels. By knowing the exact composition of carbon dioxide, we can make predictions as to the effects of different chemical processes.
I hope this helps :)
A student measures the mass of an graduated cylinder to be
14.13 g. They then fill the graduated cylinder with a liquid to a
volume of 19 mL. The mass of the liquid is measured to bbe
59.08 g. An object is then placed in the graduated cylinder.
The volume is then measured to be 41.6 mL. If the final mass
of the cylinder, object, and fluid is measured to be 91.2 g, what
is the density of the object?
Answer:
Density=189.9/226ml.
Explanation:
total mass=91.2g.
41.6ml-19ml=22.6ml of the object.
mass of the object=91.2-71.21=18.99g.
so D=M/V.
D=18.99/22.6.
D=189.9g/226ml
Nitric acid is a component of acid rain that forms when gaseous nitrogen dioxide pollutant reacts with gaseous oxygen and liquid water to form aqueous nitric acid. True or false?.
Answer:
true.nitric acid reacts with those chemicals to form aqueous nitric acid
Will give brainliest and 20 points!
calculate the number of moles of the indicated substance in each of the following samples.
a. 49.2 mg of sulfur trioxide 6.14 x 10-4 mol so3
b. 7.44 x 104 kg of lead(iv) oxide
c. 59.1 g of chloroform, chcl3
d. 3.27 mg of trichloroethane, c2h3cl3
e. 4.01 g of lithium hydroxide
The number of moles of indicated substance in each sample is -
a) 6.14 x 10⁻⁴ mol
b) 3.1 x 10⁵ mol
c) 0.4 mol
d) 2.45 mol
e) 0.16 mol
To calculate number of moles of each substance in sample -
a) Sulfur trioxide
Given mass = 49.2 mg = 0.0492 g
Molar mass = 80.06 g/mol
Number of moles of sulfur trioxide = Given mass
Molar mass
= 0.0492g = 6.14 x 10⁻⁴mol
80.06 g/mol
b) Lead(iv) oxide
Given mass = 7.44 x 10⁴ kg = 7.44 x 10⁷ g
Molar mass = 239.2 g/mol
Number of moles of lead(iv)oxide = Given mass
Molar mass
= 7.44 x 10⁷g = 3.1 x 10⁵mol
239.2 g/mol
c) Chloroform (CHCl₃)
Given mass =59.1 g
Molar mass = 119.38 g/mol
Number of moles of chloroform = Given mass
Molar mass
= 59.1 g = 0.4 mol
119.38 g/mol
d) Trichloroethane (C₂H₃Cl₃)
Given mass = 3.27 mg = 0.00327 g
Molar mass = 133.4 g/mol
Number of moles of trichloroethane = Given mass
Molar mass
= 0.00327 g = 2.45 mol
133.4 g/mol
e) Lithium hydroxide
Given mass = 4.01 g
Molar mass = 23.95 g/mol
Number of moles of Lithium hydroxide = Given mass
Molar mass
= 4.01 g = 0.16 mol
23.95 g/mol
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This gaseous element has 5 valence electrons and few
sodium.
The gaseous element having 5 valence electrons and fewer neutrons than sodium is Nitrogen.
Nitrogen has the atomic number 7, and it is represented by the symbol 'N'. Nitrogen is a nonmetallic compound and is light in weight. It is found in abundance in the atmosphere. Nitrogen usually exists in oxidation states of -3, +3, and +5. It has five valence electrons, 7 protons, and 7 neutrons, while the number of protons and neutrons in Sodium having atomic number 11 are 11 and 12 respectively. The atomic configuration of nitrogen is 1s², 2s², and 2p³. Valence electrons may be defined as the number of electrons that can be lost or gained by an atom to achieve the configuration of noble or inert gases.
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the criterion for whether a reaction proceeds spontaneously is delta g not delta g not, because delta g takes into account the concentrations of the substrates and products
Yes this statement is true because the concentration is two help determine whether the reaction is moving forward or backwards direction
Here it is at standard condition and delta g not is always the same because it denote that the reactant/product are at standard temperature or product as the reaction goes toward equilibrium delta g change because reaction is proceeding forward and delta g not is standard change in free energy between reactant and product. delta g is used to find gibbs free energy in nonstandard conditions while delta g naught is used to determine gibbs free chemical reaction energy under normal conditions. that's why this statement is true.
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What similarities and differences can you identify between neon signs and fireworks?
The fireworks are colorful and neon signs are orange in color.
What is the difference between neon signs and fireworks?When a firework is fired, the atoms of the various chemical compounds inside it absorb energy.
When the electrons return to lower energy levels, they emit colored light.
Various colors can be produced depending on the chemical employed. In glass tubes filled with neon, gas is neon lights or signage.
When the lamp is plugged in, the electrical energy causes the neon electrons to leap to higher energy levels; when they go to lower levels, colorful light is given out.
The neon never runs out, which is neat. Electrical energy is the sole resource that is consumed.
Since they are not destroyed, the electrons can be employed repeatedly to advance through levels.
The orange light that neon emits is visible.
Even while neon signs often glow in orange light, there are many other hues that can be used.
The changes occur when other gases, such as argon or krypton, or painting the tube to generate a specific hue when lit, are used instead of neon.
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the _________ in the equation means a reaction is happening
how pollutant gas become water pollution
Answer:
In the atmosphere, water particles mix with carbon dioxide sulphur dioxide and nitrogen oxides, this forms a weak acid. Air pollution means that water vapor absorbs more of these gases and becomes even more acidic.
Explanation:
A 20.0-liter flask contains a mixture of argon at 0.72 atmosphere and oxygen at 1.65 atmospheres. what is the total pressure in the flask? a. 0.93 atm b. 2.37 atm c. 8.44 atm d. 18.6 atm
A 20.0-liter flask contains a mixture of argon at 0.72 atmosphere and oxygen at 1.65 atmospheres. The total pressure in the flask is 2.37 atm.
The macroscopic characteristics of ideal gases are related by the ideal gas law (PV = nRT). A gas is considered to be perfect if its particles (a) do not interact with one another and (b) occupy no space (have no volume).
The partial pressures of the gases in a mixture of gases are added to determine the total pressure in the flask. This is the partial pressures law of Dalton.
The total pressure of the gases = P1+P2+P3+..Pn=[tex]P_{total}[/tex]
Therefore, in the given scenario, the flask's total pressure will be equal to 0.72+1.65 = 2.37 atm. Therefore, when a 20.0-liter flask includes a mixture of argon at 0.72 atmospheres and oxygen at 1.65 atmospheres, the total pressure in the flask is 2.37 atm.
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a substance that is composed of two or more elements or compounds that are not chemically combined
Substance that is composed of two or more elements or compounds that are not chemically combined is called mixture.
A material system known as a mixture is composed of two or more separate components that are joined physically but not chemically. When two or more substances are physically combined, their identities are maintained, and the mixture takes the shape of solutions, suspensions, or colloids.Homogeneous and heterogeneous mixtures are the two basic categories of mixtures.Heterogeneous mixtures have varying compositions and qualities throughout, meaning that the mixture's characteristics are not constant.A homogenous mixture is one that shares the same characteristics and composition across its mass.For example, the elements in the food we eat, the gases in the air we breathe, and the fuel we use in trains are all mixtures.Learn more about mixture here:
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The properties of matter are ways that you can _____matter.
(I have to fill in the blank.)
Answer:
measure suits the most here
csbr has a crystal structure where each br- ion (blue) is surrounded by 8 cs ions (green). derive the minimum r/r (or rc/ra) ratio required for stability for the general case of cn
CsBr has a crystal structure where each [tex]Br^{-}[/tex] ion (blue) is surrounded by 8 [tex]Cs^{+}[/tex] ions (green). derive the minimum r/r (or rc/ra) ratio required for stability for the general case of CN 8 is 0.414.
Tetrahedral and octahedral holes will have different diameters if an assortment of anions are present in the form of cubic tight packing. As a result, the cations will only fill the holes if there is enough room for them to do so. Radius Ratio can be used to make a forecast about whether the ions will be able to hold the cations.
Many cations and anions can be found in ionic crystals. We are aware that anions are bigger than cations and surround them. They are positioned in space so that anions and cations are in contact with one another, creating the greatest stability.
On the basis of the radius ratio, this stability of the ionic crystals can be justified. As a result, the ratio of cation equals the radius ratio.
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Hydrochloric acid + Copper carbonate --> ___+___+___
The complete reaction is Hydrochloric acid + Copper carbonate = calcium chloride +carbon dioxide + water
This reaction is an example for decomposition reaction. A chemical breaking down into two or more simpler compounds is known as a decomposition process. A decomposition reaction has the general form AB ———- A+B. The majority of decomposition processes demand an energy input in the form of heat, light, or electricity. three types Reaction to thermal decomposition. Heat-induced chemical reaction when one material splits into two or more compounds.
Reaction of electrolytic decomposition.
Decomposition by sunlight
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Calcium chloride, carbon dioxide, and water are the end products of the whole reaction between hydrochloric acid and copper carbonate.
An illustration of a decomposition reaction is this one. A decomposition process is when a substance breaks down into two or more simpler components. The general form of a decomposition reaction is AB = A+B. Most decomposition processes require the addition of energy in the form of heat, light, or electricity. three kinds in response of decomposition chemical reaction brought on by heat , light and electricity when one substance divides into two or more compounds.When a compound's aqueous solution is exposed to an electric current, electrolytic breakdown occurs. When water is exposed to electrical energy from a battery, the water separates into the diatomic molecules of hydrogen and oxygen.Heat is a reactant in the chemical reaction known as thermal breakdown. These reactions are endothermic, which means that thermal energy is needed to break the chemical bonds between the molecules since heat is a reactant in the reaction.Photolytic decomposition is a term used to describe a type of breakdown reaction when energy is given in the form of light.There are three ways through which we can decomposed the compound into simpler substance.
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Please help with this question ignore the highlighted choice all I know is that it's not C or the 3rd one
3.
What is the oxidation number of oxygen (O) in O2?
0
+2
−2
+4
Which statement is true about the environment
of most of Earth?
(1) It is usually greatly unbalanced.
(2) It is usually in equilibrium and hard
to change.
(3) It is usually in equilibrium but easy to change
on a small scale.
(4) It is normally heavily polluted by natural
occurrences.
The statement true about the environment of most of the earth is that it usually in equilibrium but easy to change on a small scale.
The balance between the energy flowing in from the Sun and the energy leaving the Earth is known as the earth-atmosphere energy balance. Both shortwave and ultraviolet energy are emitted when the Sun releases energy. When it gets to the Earth, some of it is absorbed by the atmosphere, some is reflected back to space by clouds, and some is absorbed at the surface of the planet.The global energy balance is particularly dependent on the absorption of infrared radiation that the Earth is trying to send back into space.The moon, which has no atmosphere, has an average surface temperature of 0°F (-18°C). The average surface temperature of the Earth is 59°F (15°C), in comparison. This effect is called green house effect.This Equilibrium of Earth and atmosphere can change with variation in green house gases.Therefore, Option 3 is correct statement
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When a vinegar and oil salad dressing separates into two layers, the oil floats on top of the vinegar. the density of the oil_____the density of the vinegar.
Answer:
Is less than
Explanation:
Vinegar contains more chemicals and molecules in it thus has a higher density thus pushing the oil upward because there is no room for the oil
When a vinegar and oil salad dressing separates into two layers, the oil floats on top of the vinegar, the density of the oil is less than the density of the vinegar.
What is density?A substance's density is a measurement of how heavy it is in relation to its size. When placed in water, an object will float if its density is lower than that of the water, whereas it will sink if its density is higher.
The density of a material is a distinguishing quality that is independent of the substance's volume.
A nonpolar material won't dissolve in a polar one. When oil and vinegar are combined, the vinegar is more thick and polar than the oil and sinks to the bottom of the container.
Because it is nonpolar and less thick than the vinegar, the oil floats on top rather than dissolving in it.
Thus, the density of oil is less than the vinegar.
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A nitrogen oxide contains 30. 45% n mass. If the molar mass of the compound is 90. ± 5 g/mol, what is its molecular formula?.
[tex]N_{(1*2)} O_{(2*2)} = N_{2} O_{4}[/tex] this is the molecular formula.
How do you locate the molecular formula?Divide the compound's molar mass by the empirical formula molar mass. The outcome should be a whole number or very close to one. Multiply the whole number found in step 2 by all the subscripts in the empirical formula. The molecular formula is the end result.An empirical formula is the simplest whole-number ratio of the various atoms in a compound. The molecular formula specifies the number of different types of atoms present in a compound molecule.With the given molar mass or the molecular formula mass, we can get the whole-number multiple for the compound.Whole-number multiple =[tex]\frac{90 g/mol}{46.01 g/mol}[/tex] ≈ 2
Multiplying the subscripts of [tex]N_{1} O_{2}[/tex] by 2, the molecular formula is
[tex]N_{(1*2)} O_{(2*2)} = N_{2} O_{4}[/tex]
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