Explain what atom is used as a reference when determining how many atoms are in a mole
Answers
Answer: Ok so the MOLE (mol) is a unit of measurement representing the amount of a substance that contains the same number of atoms as there are molecules in exactly 12 grams of carbon-12 (i.e., 6022X1023).
Explanation: And that's how it goes, I hope you understood it well!
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Related Questions
Plz help! :) :D I will mark you as BRAINLIEST!!!
Physical and Chemical Properties of Magnesium
Here is an EXAMPLE of how it has to be like. Instead of Mercury, you HAVE to do Magnesium
Physical Properties of Mercury: ”I’m a highly stable element, so you can count on me”
Chemical Properties of Mercury: ”I love to travel but I do corrode aluminum so we won’t be flying off on adventures in airplanes planes anytime soon”
Answers
Answer:
Some of the physical and chemical properties of magnesium are:
-The term ‘magnesium’ is derived from the Greek word magnesia, which refers to the name of the place from where it was extracted.
-Magnesium is closely related to manganese and magnetite.
-About 2.1% of the Earth’s crust contains magnesium. This makes magnesium the 6th most found element.
-The biggest deposits of magnesium is found in the seawater. It has been calculated by scientists that a cubic mile of seawater contains about 6 million tons of this element
2nd answer:
Physical Properties of Magnesium: ”I’m a highly stable element, so you can count on me”
Chemical Properties of Magnesium: ”I love to travel but I do corrode aluminum so we won’t be flying off on adventures in airplanes planes anytime soon
Explanation:
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what is the ground state electron configuration of mn 2? group of answer choices [ar] 3d7 [ar] 4s2 3d7 [ar] 4s2 3d3 [ar] 3d5 [ar] 4s2 3d5
Answers
The ground state electron configuration of Mn2+ is [Ar] 3d5 4s2, where two electrons have been removed from the neutral state of Mn.
Mn2+ has lost two electrons from its neutral state, Mn.
The electron configuration of Mn is [Ar] 4s2 3d5, where [Ar] represents the electron configuration of the noble gas, argon.
When Mn loses two electrons, they are first removed from the highest energy level, which is the 4s orbital. Therefore, the electron configuration of Mn2+ becomes [Ar] 3d5 4s0. However, the 3d orbitals have a lower energy than the 4s orbital, so one electron from the 4s orbital moves to the 3d orbital to create a half-filled subshell. This results in the ground state electron configuration of [Ar] 3d5 4s2.
In summary, the ground state electron configuration of Mn2+ is [Ar] 3d5 4s2, where two electrons have been removed from the neutral state of Mn.
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Which of the following is an ionic compound?
(A) CO₂
B) NH3
C) KBr
D) C12
Answers
Answer:
co2
Explanation:
it is an ionic compound
Select, from the following options, all that correctly describe the structural features which allow a species to exhibit resonance. Check all that apply. a. A double bond is adjacent to a positively charged carbon atom. b. Two adjacent atoms both have lone pairs of electrons. A C C bond is present in the structure. c. An atom with a lone pair is adjacent to an atom with a positive charge. d. A double bond is adjacent to an atom with a lone pair of electrons. Determine the monochlorination product(s)
Answers
The options given above correctly describe the structural features that allow a species to exhibit resonance.
A positively charged atom is next to an atom with a lone pair.Next to a positively charged carbon atom is a double bond.An atom with a single pair of electrons is next to another atom via a double bond.Next to an atom with a positive charge is an atom with a lone pair. A positively charged carbon atom is next to a double bond. An atom that has a single pair of electrons is next to a double bond.
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A human is an example of a(n)
A) element
B) compound
C) homogeneous mixture
D) heterogeneous mixture
Answers
Answer:
d
Explanation:
'Heterogeneous Mixture' is characterized as 'a mixture that has more than one phase and its components are distinct visibly.'
The human being serves as an illustration of:
D). heterogeneous mixture
The components of a heterogeneous mixture are not distributed uniformly leading to their visibility. Humans demonstrate a 'heterogeneous mixture' as the human body is comprised of distinct elements and not divided uniformly. Some parts are hard, while the others are soft. Some comprising of calcium, phosphorous while the others are formed of carbon and nitrogen. The tendons, blood vessels, hemoglobin, cartilage etc., all possess a varied composition with uneven distribution.Thus, option D is the correct answer.Learn more about 'heterogeneous' more:
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Name the following alkyne.
Please help me <3
Answers
Answer:
D. 7-methyl-3-octyne
Explanation:
1) Identify the parent chain and name it like an alkane.
• The longest chain of carbons, which consists of the functional group (which is the alkyne group in this case: C≡C).
• There are 8 carbons in the longest chain, so it is called an octane.
2) Now, identify the location of the functional group.
• The location number of the functional group should be as low as possible. Thus although we could count from the right, we start counting from the left since the functional group is closer to the left. From the left, the functional group would be at carbon 8 while from the left, it is on carbon 3.
• Replace 'ane' with 'yne' in octane for the alkyne group.
• This would give us 3-octyne.
3) Lastly, add in the name of the branch.
• Here we have one branch, -CH₃. This is read as methyl.
• Identify the location number of the branch by counting the number of carbons in the same direction as when we counted the location number of the functional group. The methyl branch has a location number of 7.
• Adding the name of the branch before the parent chain, we would arrive at 7-methyl-3-octyne as the IUPAC name of the alkyne.
Further Explanation:
A) This option is incorrect as there are only 8 carbons in the parent chain. Although there are 9 carbons in total, the 9th carbon is taken care of in '7-methyl'.
B) Location number of the functional group should be as low as possible, so start counting the number of carbons from the left!
C) Since the functional group is an alkyne, the word 'octane' should be 'octyne' instead.
La siguiente reacción es altamente exotérmica: N2H4 + O2 → N2 + H2O ∆H= -622,4 Kj Cuánto calor se libera al producir 5 moles de nitrógeno.
Answers
Answer: -3112 kJ of heat will be released when 5 moles of nitrogen is produced.
Explanation:
We are given:
Moles of nitrogen = 5 moles
Given chemical reaction follows:
\(N_2H_4+O_2\rightarrow N_2+2H_2O;\Delta H=-622.4 KJ\)
By stoichiometry of the reaction:
If 1 mole of nitrogen gas is produced, the heat released is -622.4 kJ
So, if 5 moles of nitrogen gas is produced, the heat released will be = \(\frac{-622.4kJ}{1mol}\times 5mol=-3112kJ\)
Hence, -3112 kJ of heat will be released when 5 moles of nitrogen is produced.
Uranium has three isotopes with the following percent abundances: 234- (0.0058%), 235- (0.71%), 238- (99.23%). Without doing any calculations, what do you expect the atomic mass of uranium to be in whole numbers. Why?
Answers
Answer:
Because it is the same element but has different atomic mass
where in the air-conditioning system is the refrigerant a low-pressure gas
Answers
In an air-conditioning system, the refrigerant undergoes a cycle of evaporation and condensation to cool the air. The refrigerant starts as a low-pressure gas in the evaporator coil, where it absorbs heat from the surrounding air and evaporates into a low-pressure gas. This evaporation process cools the air as well. The evaporator coil plays a crucial role in this system by facilitating the evaporation of the refrigerant and cooling the air.
On the other hand, the refrigerant transitions from a high-pressure gas to a high-pressure liquid in the condenser. The condenser is responsible for releasing the heat absorbed by the refrigerant in the evaporator to the surrounding air. As the refrigerant condenses into a high-pressure liquid, it releases heat, allowing it to transfer the heat from the inside of a building to the outside.
This cycle of evaporation in the evaporator and condensation in the condenser enables the refrigerant to remove heat from the indoor space and release it outside. By continuously circulating the refrigerant and repeating this process, an air-conditioning system can cool the air inside a building and maintain a comfortable temperature.
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it is for science class please help answer the questions and fast . I will
mark brainliest but it has to be right.
Answers
Bioluminescence Imaging.
Explanation:
Bioluminescence is appealing as an approach for in vivo optical imaging in mammalian tissues because these tissues have low intrinsic bioluminescence; therefore, images can be generated with remarkably high signal-to-noise ratios. A variety of different bioluminescent systems have been identified in nature, each requiring a specific enzyme and substrate. Although the most commonly used bioluminescent reporter for research purposes has been luciferase from the North American firefly (Photinus pyralis; FLuc), useful luciferases have also been cloned from jellyfish (Aequorea), sea pansy (Renilla; RLuc), corals (Tenilla), click beetle (Pyrophorus plagiophthalamus), and several bacterial species (Vibrio fischeri, V. harveyi).
Hope this is what you need!
Please give Brainliest!
Please help and thank you
Answers
4 InS03 + 3 RSC2 --> 2 In Sc3+3 RS04
Using the balanced equation, if you had 4.3 moles of InSoz, what volume would RS04 occupy at
STP?
Answers
Answer:
Explanation:
Balance the following equation :
Sodium + water sodium hydroxide + hydrogen with steps
Answers
Answer:
2Na + 2H2O → 2NaOH + H2
Explanation:
This is the balanced equation of,
Sodium + water → sodium hydroxide + hydrogen
Which equation is balanced?
Al+3O2→Al2O3
2Al+3F2→2AlF3
Na+F2→2NaF
Mg+2O2→2MgO
Answers
Answer:
3rd one
Explanation:
I just took the test and got 100%
Answer:
2nd one
Explanation:
Took the test
When talking about antagonists, we use IC50s rather than EC50s. (a) Why? (b) How might an antagonist have very different IC50s when applied to the same receptor in two different experiments?
Answers
When talking about antagonists, we use IC50s rather than EC50s because IC50s measure the concentration of an antagonist needed to reduce the effect of an agonist by 50%, while EC50s measure the concentration of an agonist needed to produce 50% of the maximum response. These two measurements are different because they measure the effect of different types of drugs on a receptor.
An antagonist might have very different IC50s when applied to the same receptor in two different experiments because of differences in the experimental conditions. For example, the presence of other drugs or substances in the experimental system, differences in the receptor density, or differences in the signaling pathways activated by the receptor can all affect the IC50 of an antagonist. Additionally, the experimental methods used to measure the IC50, such as the type of assay or the duration of the experiment, can also affect the results. Therefore, it is important to consider these factors when comparing IC50s from different experiments.
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Helppppppp plzzzzzzzzz
Answers
Answer: C
Explanation:
Cells have different receptors on their surfaces that are responsive to particular signals (such as hormones). When a signal interacts with the particular receptor, a particular response is invoked in the cell. This signal may be produced even by a cell that may be far away from the target cells. This is how cells communicate with each other to maintain homeostasis in the body.
A cross results in three phenotypes. A nual typothesis of recessive epistasis is tested. Your calculated chi-square value is 6.4. Assuming a p Value of 0.05, do you reject the null frypothesis? yes. No
Answers
The null hypothesis is rejected when the chi-square value is higher than the critical value or p-value. In this case, the chi-square value of 6.4 is higher than the critical value for a p-value of 0.05, which is 3.84. Therefore, the null hypothesis is rejected.
A cross results in three phenotypes. A null hypothesis of recessive epistasis is tested. Your calculated chi-square value is 6.4. Assuming a p-value of 0.05, do you reject the null hypothesis?The answer is yes.What is a chi-square value?A chi-square value is a measure of how different two sets of data are. It compares the observed data to the expected data and generates a statistic that shows how far apart they are. It compares the observed data to the expected data and generates a statistic that shows how far apart they are. The chi-square test is a statistical hypothesis test that is used to determine if there is a significant difference between two groups of data. The null hypothesis is rejected when the chi-square value is higher than the critical value or p-value. In this case, the chi-square value of 6.4 is higher than the critical value for a p-value of 0.05, which is 3.84. Therefore, the null hypothesis is rejected.
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Is Octylphenol ethoxylate a Slovent or Solute?
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I'm horrible at Chem plse help! Determine whether the reaction given below would be spontaneous or not. JUSTIFY your answer.
Mg2+ (aq) + Ag (s) → Ag+ (aq) + Mg (s)
Thank you
Answers
Answer:
This is a not a spontaneous reaction.
Explanation:
No, it would not be one because if you add the reactants the products would have to be the same (same types of atoms. number of atoms, and the arrangement of the atoms). In this case the reactants and the products are not equal.
You are asked to separate sand and sodium chloride name the methods needed to carry out the procedure. Explain how you would carry out the procedure to obtain pure sand and sodium chloride back.
Answers
Method: Filtration
Sodium chloride is your everyday common table salt! So it's just separating salt fro. Water!
Procedure: The mixture of salt and sand can be separated by filtration followed by an evaporation process. Filtration can separate sand from a combination of sand and salt solution (salt dissolved in water). Sand stays on the filter paper as a residue after filtering. By boiling the filtrate, common salt may now be produced. Boiling causes all of the water to evaporate, leaving just salt remaining. This is known as evaporation. Thus, this is how salt and sand are separated.
A plane flies from NY to LA at a constant speed of 800 km/hr. How long will it take the plane to fly the 4200 km? 5
Answers
As the plane plane flies at a constant speed of 800 km/hr the plane will take 5 hours 25 minutes to fly distance of 4200 km.
What is speed?Speed is defined as the rate of change of distance with time. It has the dimension of distance by time. Thus, the SI unit of speed is given as the combination of the basic unit of distance and the basic unit of Time. Thus, the SI unit of speed is metre per second. In everyday life, kilometre per hour or in countries like US and UK miles per hour are used as the unit of speed.
The SI unit of speed can be derived from the formula of velocity. Basically, velocity is the vector equivalent of speed. Mathematically, velocity is given as the ratio of displacement to the time taken.So, 800 km is traveled in 1 hour so 4200 km will be traveled 4200/800=5.25 which is 5 hours and 25 minutes.
Thus, the plane will take 5 hours 25 minutes to fly distance of 4200 km.
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Please answer all and I will give you 50 points, you need to pick one for each
Answers
Answer:
1. 3
2. 2
3. 4
4. 1
Explanation:
Who's model was titted the atomic theory of matter"? *
Answers
Answer:
John Dalton
Explanation:
Answer:
John Dalton, an English chemist, inferred that atoms had certain characteristics. He began to propose an atomic the- ory and model for atoms. The main ideas of Dalton's theory are summarized in Figure 2. With only a few changes, Dalton's atomic theory is still accepted today.
Explanation:
What is the density in g/cm3 of an unknown material if a cube of
the material measures 3.60 cm on a side and has a mass of 3.92 g?
Answer to the correct number of significant figures.
Answers
The density of an unknown material is 0.084 g/cm³ when a cube of the material measures 3.60 cm on a side and has a mass of 3.92 g
The density of an unknown material in g/cm³ can be found using the formula, Density = Mass/Volume. Where, the mass of the cube is given as 3.92 g, and the length of the side of the cube is given as 3.60 cm.
Thus the volume of the cube can be calculated as:
Volume = (side length)³
= (3.60 cm)³
= 46.656 cm³
Substituting the given values in the formula we get:
Density = Mass/Volume
= 3.92 g/46.656 cm³
= 0.084 g/cm³
Therefore, the density of an unknown material is 0.084 g/cm³ when a cube of the material measures 3.60 cm on a side and has a mass of 3.92 g.The answer should be rounded off to 3 significant figures, thus the answer is: 0.084 g/cm³.
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an isolated atom of a certain element emits light of wavelength 605 nm when the atom falls from its fifth excited state into its second excited state. the atom emits a photon of wavelength 425 nm when it drops from its sixth excited state into its second excited state. find the wavelength of the light radiated when the atom makes a transition from its sixth to its fifth excited state.
Answers
The wavelength of the light radiated when the atom makes a transition from its sixth to its fifth excited state would be 180nm.
Since the atom is isolated, which means that no external factors would be affecting the atom's excited state.
So if the atom falls from sixth excited state to second excited state, it emits a wavelength of 425 and similarly if it falls from Fifth excited state to second excited state a photon of wavelength 605 is emitted, and we have to calculate the wavelength which will be emitted if it drops from sixth to fifth excited state, which would be equal to subtracting the two wavelength which are provided in the question
Required Wavelength : 605 - 425 = 180 nm
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2 Aluminum oxidizes according to the following equation: 4A1 + 302 → 2Al2O,
[a] Powdered Al (0.048 myl) is placed into a container containing 0.030 mol O.. What is the limiting reactant?
[b] How many moles of the excess reoctant remaine?
Answers
Answer:
Identify the limiting reactant (limiting reagent) in a given chemical reaction.
Calculate how much product will be produced from the limiting reactant.
Calculate how much reactant(s) remains when the reaction is complete.
How do plants recycle hydrogen during cellular respiration?(1 point) Responses The hydrogen in water is recycled as glucose. The hydrogen in water is recycled as glucose. The hydrogen in glucose is recycled as hydrogen gas. The hydrogen in glucose is recycled as hydrogen gas. The hydrogen in glucose is recycled as water. The hydrogen in glucose is recycled as water. The hydrogen in hydrogen gas is recycled as glucose. The hydrogen in hydrogen gas is recycled as glucose.
Answers
Plants recycle hydrogen during cellular respiration, as the hydrogen in glucose is recycled as water. The correct option is d.
What is cellular respiration?Food molecules are broken down into energy, water, and carbon dioxide during cellular respiration. In the presence of oxygen, cells respire. Multiple chemical cycles are involved in cell respiration.
In plants, cellular respiration occurs but in a minimum amount, and in this process the hydrogen in combines with oxygen and forms water.
Therefore, the correct option is d. The hydrogen in glucose is recycled as hydrogen gas.
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Answer: Plants recycle hydrogen during cellular respiration, as the hydrogen in glucose is recycled as water. The correct option is d.
Explanation: What is cellular respiration?
Food molecules are broken down into energy, water, and carbon dioxide during cellular respiration. In the presence of oxygen, cells respire. Multiple chemical cycles are involved in cell respiration.
In plants, cellular respiration occurs but in a minimum amount, and in this process the hydrogen in combines with oxygen and forms water.
Therefore, the correct option is d. The hydrogen in glucose is recycled as hydrogen gas.
How to i determine the melting point ,i’ve got no clue
Answers
Temperature stays the same during state of matter change. After plotting the graph of temperature vs time and the curve is outlined, the moment the graph plateaus read the temperature that is constant(repeatedly occurs).
From the points given in the table of value, am sure the melting point is 78°C.
All the best!
Balance the following reaction:
C2H6(g) + O2(g) → CO2(g) + H2O(g)
Answers
To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. Therefore, the balanced equation is
2C\(_2\)H\(_6\)(g) + 7O\(_2\)(g) → 4CO\(_2\)(g) + 6H\(_2\)O(g)
What is Balanced equation?Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, displacement reaction.
C\(_2\)H\(_6\)(g) + O\(_2\)(g) → CO\(_2\)(g) + H\(_2\)O(g)
Multiply by 7 on reactant side and by 6 on product side to balance oxygen
C\(_2\)H\(_6\)(g) + 7O\(_2\)(g) → CO\(_2\)(g) + 6H\(_2\)O(g)
Now balance carbon and hydrogen
2C\(_2\)H\(_6\)(g) + 7O\(_2\)(g) → 4CO\(_2\)(g) + 6H\(_2\)O(g)
Therefore, the balanced equation is
2C\(_2\)H\(_6\)(g) + 7O\(_2\)(g) → 4CO\(_2\)(g) + 6H\(_2\)O(g)
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which element is more metallic? a. ca or rb b. mg or ra c. br or i d. si or p
Answers
a. Ca (calcium) is more metallic than Rb (rubidium).
b. Mg (magnesium) is more metallic than Ra (radium).
c. Br (bromine) is more metallic than I (iodine).
d. Si (silicon) is less metallic than P (phosphorus).
Among the given pairs of elements, Ca is more metallic than Rb, Mg is more metallic than Ra, Br is more metallic than I, and Si is less metallic than P.
The metallic character of an element is determined by its tendency to lose electrons and form positive ions. Generally, metallic elements have low ionization energies and readily lose electrons to form cations. Non-metallic elements, on the other hand, have high ionization energies and tend to gain electrons to form anions.
In the given pairs, Ca is more metallic than Rb because Ca is an alkaline earth metal and has a stronger tendency to lose electrons compared to Rb, which is an alkali metal. Similarly, Mg is more metallic than Ra because Mg is an alkaline earth metal with a higher metallic character than Ra, which is a radioactive alkaline earth metal.
In the case of Br and I, Br is more metallic than I. Both elements are halogens, but Br has a higher metallic character due to its lower ionization energy and greater tendency to lose electrons compared to I.
Lastly, Si is less metallic than P. Si is a metalloid and exhibits properties of both metals and non-metals. It has a higher ionization energy and a stronger non-metallic character compared to P, which is a non-metal.
Therefore, based on their relative tendencies to lose or gain electrons, the given elements can be ranked in terms of their metallic character.
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