Using VSEPR theory, we would expect the three dimensional geometric shape of a molecule of CCl4 to be
A) trigonal planar
B) tetrahedral
C) bent
D) linear
Given the speed of light is 3×10^8m/s calculate the wavelength of the electromagnetic radiation whose frequency is 7.8x10^12Hz. Answer in units of m.
The wavelength of the electromagnetic radiation is 4.87 × 10⁻⁵ m.
What is the wavelength of an electromagnetic radiation?The wavelength of an electromagnetic radiation is the distance between successive points in the wave that are in phase.
The wavelength, speed and frequency of a wave are related by the formula below:
Speed = wavelength * frequencyHence;
Wavelength = speed / frequency
The speed of the wave = 3 × 10⁸ m/s
frequency = 7.8 x 10¹² Hz
Wavelength = 3 × 10⁸ m/s / 7.8 x 10¹² Hz
Wavelength = 4.87 × 10⁻⁵ m
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Examine the graph below. Which of the following statements describing the diagram is TRUE?
A) this is an endothermic reaction
B) energy is being absorbed
C) this is an exothermic reaction
D) the reactants have less energy than the products
The reaction shown in the given graph is an exothermic reaction. Therefore, option (C) is correct.
What is an exothermic reaction?An exothermic reaction involves the release of energy in the form of heat or light in the chemical reaction. These reactions can be expressed in a chemical equation as follows:
Reactants → Products + Heat/energy
An exothermic reaction in which energy is released in the form of light or heat and are the opposite of endothermic reactions. The energy is transferred into the surroundings in an exothermic reaction rather than absorbing energy from the surroundings as in an endothermic reaction.
The change in enthalpy ( ΔH) will be negative in an exothermic reaction. The net amount of energy needed to start an exothermic reaction is less than the net amount of energy liberated by the reaction.
In an exothermic reaction, the reactants have higher energy than that of the products. Therefore, an exothermic reaction will have a negative value for the change in enthalpy (ΔH < 0).
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the sweetness of honey gradually decreases at a high temperature. also, high-fructose corn syrup (a commercial product in which much of the glucose in corn syrup is converted to fructose) is used for sweetening cold drinks but not hot drinks. what chemical property of fructose could account for both of these observations?
Answer:
Fructose will cyclize to either furanose or pyranose. Increasing the temperature shifts the equilibrium in the direction of furanose, the less sweet form.
Explanation:
The higher the temperature the less sweet since there will be more furanose than pyranose.
electrochemistry studies the movement of electrons, or electricity during a spontaneous chemical reaction, or the use of electricity to bring spontaneous chemical transformations.
"Something done or occurring as a result of a sudden impulse or inclination and without premeditation or external provocation" is "spontaneous." Electro-chemical batteries contain chemical reactions that happen naturally spontaneously, or without the use of an external force.
Electro-chemical batteries contain chemical reactions that happen naturally spontaneously, or without the use of an external force. However, the opposite is not a spontaneous process since electrical energy (external stimuli) is required to induce chemical reactions inside the electrochemical cell, primarily to charge it. As a result, the latter transition is not spontaneous.
Potential is generated by spontaneous redox reactions, which can be used as a source of electrical energy, but it is not the purpose for the electrolytic cell. An electrolytic cell is a device that uses electricity to carry out chemical changes (lytic meaning breaking).
The study of chemical reactions involving the motion of electrons is known as electrochemistry. Redox processes are what drive electron motion. Galvanic and electrolytic cells make up its two different cell types.
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Which atomic particle(s) is (are) found in the nucleus of an atom?
Answer
Protons And Neutrons
Explanation
The nucleus itself is generally made of protons and neutrons but even these are composite objects. Inside the protons and neutrons, we find the quarks, but these appear to be indivisible, just like the electrons.
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What pressure will be required for neon at 30°C to have the same density as nitrogen at 20°C and 1.0 atm?
1.5 atm pressure will be required for neon at 30°C to have the same density as nitrogen at 20°C and 1.0 atm.
What does nitrogen gas density mean?Nitrogen gas has a density of 0.07807 lbs/cubic foot (0.0012506 grams/cubic centimeter) at 32 degrees Fahrenheit and one atmosphere of pressure. At one atmosphere of pressure, nitrogen gas boils at 320.4 degrees Fahrenheit.
Is nitrogen a solid at STP?Dinitrogen, a colorless and odorless diatomic gas with the formula N2, is created when two of the element's atoms combine at standard temperature and pressure. Around 78% of the atmosphere on Earth is made up of dinitrogen. Diatomic molecules of nitrogen are found and have unusually low melting temperatures (210 °C) and boiling points (196 °C).
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what is the air pressure in a tornado?
The relative atomic mass of iridium is 192.22. Explain whether a naturally occurring sample of iridium contains more 191Ir or 193Ir
The relative atomic mass of iridium is 192.22.a naturally occurring sample of Iridium contains more 193Ir .
Given,
The relative atomic mass of iridium is 192.22.
191x + 193(1-x) = 192.22
191x + 193 -193x = 192.22
193x-191x = 193 - 192.22
2x = 0.78
x= 0.78/2 = 0.39
Percentage abundance of 191Ir is 39% and 193Ir is 61% .
192.22 is about 5/8 of the way from 191 to 193 ,5/8 will be Ir193 Or 61% .
Thus, a naturally occurring sample of Iridium contains more 193Ir .
What is relative atomic mass?A physical quantity with no dimensions is relative atomic mass. It is the ratio of the mass of a carbon-12 atom to the average mass of an element's atoms (from a single sample or source) (known as the unified atomic mass unit).
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