The electron configuration that represents the electrons in an atom of chlorine in an excited state is 2-8-7. Option 3.
The usual electron configuration for chlorine is 2-8-7. In an excited state, an electron can be temporarily promoted to a higher energy level. For chlorine in an excited state, one electron from the 3rd energy level (7) is elevated to a higher level, leading to the configuration 2-8-7.
This excited electron configuration indicates a temporary alteration in the arrangement of electrons, reflecting the absorption of energy. Once the excitation ceases, the electron returns to its original energy level, and the atom reverts to its ground state configuration (2-8-7).
Which electron configuration represents the electrons in an atom of chlorine in an excited state?
(1) 2-7-7 (3) 2-8-7
(2) 2-7-8 (4) 2-8-8
An action potential arriving at the presynaptic terminal causes what to occur? multiple choice voltage-gated calcium ion channels open, and calcium ions diffuse into the cell. voltage-gated sodium ion channels open, and sodium ions diffuse into the cell. acetylcholine diffuses into the cell. ligand-gated sodium channels open, and sodium ions diffuse out of the cell. voltage-gated sodium ion channels open, and sodium ions diffuse out of the cell.
An action potential arriving at the presynaptic terminal causes voltage-gated Ca²+ channels to open, allowing calcium ions to enter the cell and triggering the release of neurotransmitters into the synaptic cleft.
Explanation:When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated Ca²+ channels. Calcium ions enter the cell and initiate a signaling cascade that causes synaptic vesicles containing neurotransmitter molecules to fuse with the presynaptic membrane. This leads to the release of neurotransmitters into the synaptic cleft.
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Gases emitted during volcanic activity often contain high concentrations of hydrogen sulfide and sulfur dioxide. these gases may react to produce deposits of sulfur according to the equation: 2 h2s(g) so2(g) → 3 s(s) 2 h2o(g) for the complete reaction of 6.41 mol of hydrogen sulfide:
In a volcanic reaction, two moles of hydrogen sulfide and sulfur dioxide react to form three moles of sulfur and two moles of water. Given 6.41 moles of hydrogen sulfide, 9.615 moles of sulfur would be formed. This reaction explains the presence of sulfur deposits in volcanic areas and contributes to the removal of hydrogen sulfide from volcanic emissions.
Explanation:In the given reaction: 2H₂S(g) + SO₂(g) → 3S(s) + 2H₂O(g), hydrogen sulfide (H2S) and sulfur dioxide (SO2) are converted into sulfur (S) and water (H2O). This is a common reaction that occurs during volcanic activities when gases are emitted. It explains the presence of sulfur deposits found in volcanic areas.
As indicated by the stoichiometry of the reaction, for each two moles of hydrogen sulfide reacted, three moles of sulfur are produced. Therefore, for the complete reaction of 6.41 moles of H2S, you would expect to form 3/2*6.41 = 9.615 moles of sulfur.
The reaction is an example of redox (reduction-oxidation) process. Here, hydrogen sulfide is oxidized to water, while sulfur dioxide is reduced to sulfur. The reaction, besides leading to the creation of sulfur deposits in volcanic regions, also contributes to the removal of hydrogen sulfide one of the gases found within volcanic emissions.
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In a redox reaction, why does an element’s oxidation number increase?
A.) An element’s oxidation number increases because it gained electrons.
B.) An element’s oxidation number increases because it lost electrons.
C.) An element’s oxidation number increases because it was heated.
D.) An element’s oxidation number increases because it was reduced.
Answer: B) An element’s oxidation number increases because it lost electrons.
Explanation:
A redox reaction is a chemical reaction in which one or more electrons are transferred between the reactants, causing a change in their oxidation states.
The oxidation state or oxidation number is defined as the sum of positive and negative charges of an atom, which indirectly indicates the number of electrons that the atom has accepted or yielded.
By accepting electrons, the oxidation state of an atom decreases, becoming more negative, and therefore, it is reduced. On the other hand, an element that yields electrons increases its oxidation number and oxidizes.
In this way, an element’s oxidation number increase because it lost electrons, becoming a more positive ion.
What type of composition does an igneous rock have that contains mostly plagioclase feldspar and about 30 percent dark silicate minerals?
A. basaltic
B. granitic
C. andesitic
D. ultramafic
Answer:
The correct answer is option C, that is, andesitic.
Explanation:
Andesite is the term used for a fine-grained extrusive rocks family, which are generally light to dark gray in appearance. They generally weather to different shades of brown. Andesite mostly comprises plagioclase feldspar minerals and may also comprise pyroxene, biotite, or amphibole as the dark silicate minerals. It generally does not comprise olivine or quartz.
Calculate the number of chlorine atoms that are present in 66.05 g of dichloromethane, ch2cl2. when you have the number, take its log (base 10) and enter it with three decimal places and without units.
The base-10 logarithm of the number of chlorine atoms is 23.971.
Calculate the number of chlorine atoms that are present in 66.05 g of dichloromethane, CH₂Cl₂. When you have the number, take its log (base 10) and enter it with three decimal places and without units.
Step-by-Step Explanation:
First, determine the molar mass of CH₂Cl₂:
Carbon (C): 12.01 g/mol
Hydrogen (H): 1.01 g/mol (each, so 2.02 g/mol for H₂)
Chlorine (Cl): 35.45 g/mol (each, so 70.90 g/mol for Cl₂)
Total molar mass of CH₂Cl₂ = 12.01 g/mol + 2.02 g/mol + 70.90 g/mol = 84.93 g/mol
Calculate the moles of CH₂Cl₂ in 66.05 g:
66.05 g / 84.93 g/mol = 0.7774 mol CH₂Cl₂
Since each molecule of CH₂Cl₂ contains 2 chlorine atoms, calculate the moles of chlorine atoms:
0.7774 mol CH₂Cl₂ x 2 = 1.5548 mol Cl atoms
Convert moles of chlorine atoms to the number of atoms using Avogadro's number (6.022 x 10²³ atoms/mol):
1.5548 mol x 6.022 x 10²³ atoms/mol = 9.36 x 10²³ chlorine atoms
Take the logarithm base 10 of the result:
log10(9.36 x 10²³ )= 23.971
Therefore, the logarithm (base 10) of the number of chlorine atoms in 66.05 g of dichloromethane, CH₂Cl₂, is 23.971.
. An object with a mass of 6.0 kg accelerates 4.0 m/s2 when an unknown force is applied to it. What is the amount of the force? ______________________
Answer:
24 N
Explanation:
we have that an object of mass 6 kg has an acceleration of[tex]4 m/s^2[/tex] to find out the value of the unknown force that is applied we use the following formula
[tex]F= m.a[/tex]
The unit in which the force is expressed is in Newtons
[tex]N= kg.\frac{m}{s^2}[/tex]
[tex]F= 6.0 Kg. 4.0 \frac{m}{s^2}\\ F= 24 N[/tex]
The amount of the applied force is 24 N.
Net force on objectThe net force on an object is determined by applying Newton's second law of motion.
F = ma
where;
F is the applied forcem is the massa is accelerationF = 6 x 4
F = 24 N
Thus, the amount of the applied force is 24 N.
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What is the electron configuration of an element with atomic number 20?
Answer:
What is the electron configuration of an element with atomic number 20? 1s2 2s2 2p6 3s2 3p6 4s2
Explanation:
A bond formed by electrical attraction between two oppositely charged ions is called
What is the average speed of an object that travels 50 miles in 2 hours?
Question 3 options:
50 mph
25 mph
100 mph
2 mph
Chemical reactions with metals may create some interesting results such as a precipitate. What is a precipitate?
Question 3 options:
A. a gas that forms when two liquids are mixed
B. a solid that forms when two liquids are mixed
C. a liquid that forms when two solids are mixed
D. a solid that forms when two gasses are mixed
Hotspot volcanoes occur along subduction zones.
a. True
b. False
When atoms lose or gain electrons in chemical reactions they form?
When atoms loose or gain electrons in chemical reactions they form ions on loosing electrons they form cations and on gaining electrons they form anions.
What are ions?
An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each resulting in the formation of ionic bond.
Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions . They are very reactive in their gaseous state and rapidly react with oppositely charged ions resulting in neutral molecules.
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Why is water important for a cell? A) Water is the main ingredient in DNA. B) Most chemical reactions in cells require water. C) All proteins are made of water. D) Water is an essential organic compound.
The process where water changes from a liquid to a gas
How does a solid differ from a liquid?
b. how does a liquid differ from a gas?
c. how is a liquid similar to a gas?
d. what is a plasma?
Final answer:
Solids have a definite shape and volume, while liquids have a definite volume but their shape changes. Liquids and gases are both fluids, but gases do not have a definite shape.
Explanation:
A solid differs from a liquid in that it has a definite shape and a specific volume, while a liquid has a definite volume but its shape changes depending on the container it is in.
A liquid differs from a gas in that it does not have a definite shape and its molecules are closely packed together, while gas molecules are more spread out and can freely move around.
A liquid is similar to a gas in that both are considered fluids, meaning they can flow and take the shape of their container.
Plasma is a state of matter in which the particles are highly ionized and can conduct electricity. It does not have a definite shape or volume, and is similar to a gas in that its particles are not tightly packed together.
Which of these is a pair of isotopes? na+ and na cl-35 and cl-37 f and cl o2 and o3?
Answer:
Cl35 and Cl37.
Explanation:
That would be Cl35 and Cl37 . Two isotopes of the gas chlorine.
Identify the more stable isotope in each pair.
Which value gives the number of particles in 1 mol of a substance? 6.02 mc012-1.jpg 1021 6.02 mc012-2.jpg 1022 6.02 mc012-3.jpg 1023 6.02 mc012-4.jpg 1024
What are the two main products of the light-capturing reaction of photosynthesis?
Answer: NADPH and ATP
Explanation:
Imagine that you have a rectangular swimming pool, but you have no idea how deep it is. You
know that the pool has a volume of 216 m3
. You measured the dimensions of the pool and
found that it is 15 m long and 6 m wide.
A. Calculate the depth of the pool. Show your work.
The neutralization reactions always produced which compound?
A sample of a gas originally at 29 °c and 1.25 atm pressure in a 3.0 l container is allowed to contract until the volume is 2.2 l and the temperature is 11 °c. the final pressure of the gas is ________ atm.
The question is about the combined gas law, which factors in pressure, volume and temperature changes in a gas sample. By inserting given values into the combined gas law equation, the final pressure comes out as approximately 1.558 atm.
Explanation:The question pertains to the principles of gas laws, particularly the combined gas law, which states that pressure, volume and temperature of a gas have an interlinked relationship, and thus change proportional to each other, provided the amount of gas is kept constant.
If we denominate the initial conditions as P1, V1 and T1 (in Kelvin), and the final conditions as P2, V2 and T2 (also in Kelvin), then the combined gas law can be written as:
P1*V1/T1 = P2*V2/T2
We know that P1=1.25 atm, V1=3.0 L, and T1=29°C = 302.15 K. The final Volume V2=2.2 L and final temperature T2=11°C = 284.15 K.
Substituting these values into the equation:
1.25 * 3.0/302.15 = P2 * 2.2/284.15
By calculating, we find that P2 = 1.558 atm, which is the final pressure of the gas.
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What is the maximum number of atoms that a carbon atom can bond with in an organic compound?
Answer: 4 atoms
Explanation: Since carbon atom valency is 4 hence it forms 4 bonds with other 4 atoms.
As we know that carbon has atomic number-6 and electronic configuration 1s2 2s2 2p2
And it has 4 electrons in outer shell. These 4 electrons forms bind with other atoms.
Carbon fixation involves the addition of carbon dioxide to _____. carbon fixation involves the addition of carbon dioxide to _____. 3-pga g3p nadph rubp rubisco
Carbon fixation is a part of photosynthesis where CO2 is added to RuBP to form 3-PGA and eventually glucose. The process is catalyzed by the enzyme RuBisCO and also involves the stages of reduction and regeneration.
Explanation:Carbon fixation is a process in photosynthesis where carbon dioxide (CO2) combines with a five-carbon sugar, ribulose bisphosphate (RuBP), to form a six-carbon compound. This reaction is catalyzed by an enzyme called RuBisCO. The six-carbon compound is then broken down into two molecules of 3-phosphoglycerate (3-PGA). This cycle, known as the Calvin cycle, involves not only fixation, but also the stages of reduction and regeneration. Reduction uses ATP and NADPH to convert the 3-PGA into glyceraldehyde 3-phosphate (G3P), some of which is used to build glucose. The remaining G3P is used to regenerate RuBP, using additional ATP, which allows the cycle to continue with more carbon fixation.
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How many valence electrons does an atom of any halogen have?
PLEASE HELP ASAP WILL MARK BRAINLESS AND GIVE 20 POINTS
The process of filtration was used to separate a sample into its components. What conclusion about the sample can be formed based on the technique used?
It was a pure substance.
It was a compound.
It was a heterogeneous mixture.
It was a homogeneous mixture
Describe 2 characteristics all metals should display?
When water is heated in an ocean the liquid water changes from and turns into?
Why was Aristotle considered correct over Democritus based on their time period
Final answer:
Aristotle's ideas were favored over Democritus' because of his immense influence and the prevailing rationalist approach of the time which prioritized logic over empirical observation, leading to Aristotle's four-element theory of matter being accepted while Democritus' atomic theory was overlooked until much later.
Explanation:
Aristotle was considered more correct than Democritus during their time period because Aristotle was an incredibly influential philosopher, and his ideas were readily accepted by many. While Democritus had postulated that all matter was made up of tiny, indivisible particles called atoms, it was Aristotle's theory that everything was composed of four elements: earth, air, fire, and water that prevailed. The cultural and intellectual climate of the time favored logic and rational thought over empirical scientific methods, which meant that experimental verification of theories, like those of Democritus, wasn't pursued. Therefore, Aristotle's ideas held sway for nearly two thousand years before science recognized the validity of Democritus' concept of atoms.
Is sodium chloride a solid liquid or gas at room temperature?