Answer:
VC = 18
Explanation:
Since L is the midpoint and you have LV, you know that LC is also 9.
PLZ HELP THIS IS DUE IN 6 MINS
The majority of elements on the periodic table are ______________ (metals, nonmetals, or metalloids).
Answer:
nobel gases ,non metals and metaliods
a 2.00 l flask is filled with ethane gas (c2h6) from a small cylinder and shows a pressure of 1.08 atm of pressure and a temperature of 15.0 oc. what is the mass of the ethane in the flask? r
Using Ideal Gas Law, we can calculate the mass of ethane in a 2.00 L flask with a pressure of 1.08 atm and a temperature of 15.0°C. The answer is 2.85 g.
This issue includes utilizing the Best Gas Regulation to compute the mass of ethane in a 2.00 L flagon given its tension and temperature. The Ideal Gas Regulation relates the tension, volume, temperature, and measure of gas utilizing the condition PV = nRT. In the first place, we switched the temperature from Celsius over completely to Kelvin, then we connected the given qualities and settled for the quantity of moles of ethane in the cup. At long last, we utilized the molar mass of ethane to work out its mass. The response we acquired was 2.85 g of ethane in the cup.
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A cycle of moon phases can be seen from earth because the
the Sun light from different parts of the Moon as the Moon revolves around the Earth
Which of the following statements describes erosion?
A.
Breakdown of rocks by wind water and ice
B.
A build-up of rocks into a pile
C. Breakdown of water by ice and wind
D.
Movement of rocks by water, air, gravity, and ice
please help with my science quiz!
Answer:
D
Explanation:
Erosion is when rocks or sediments are moved around by those means mentioned.
Liquid to Gas =
Solid to Liquid =
The process of a liquid becoming a gas is called boiling (or vapourization) and the process of a solid becoming a liquid is called melting.
Vaporization is the process of converting a liquid into a gas. It is also called evaporation. Since we know that the particles of a gas are moving faster than those of a liquid, an input of energy must be required for a liquid to become a gas.
Melting is a physical process that results in the phase transition of a substance from a solid to a liquid. During melting, the energy goes exclusively to changing the phase of a substance; it does not go into changing the temperature of a substance. Hence melting is an isothermal process because a substance stays at the same temperature.
Example 1: Industrially, salt is recovered from seawater by the process of vaporization. Wet clothes are dried up due to the process of vaporization. The process is used in many industrial processes for separating the components of a mixture.
Example 2: Ice to water - Ice melts back into the water when it is left out at temperatures above the freezing point of 32 degrees. Rocks to lava - Rocks in volcanoes can be heated until they are molten lava. Metal to molten liquid - Metals such as steel and bronze can be molten down.
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List as many as possible. Thank you.
1. List an example of a solution or reagent for which precision is very important. Why is this so?
2. List an example of a solution or reagent for which precision is less critical. Why is this so?
1. An example of a solution for which precision is very important is a standard solution used in a titration experiment, such as sodium hydroxide (NaOH) solution.
Precision is crucial in this case because an accurate concentration of the standard solution is required to determine the concentration of an unknown solution. Any variation in the concentration can lead to incorrect results.
2. An example of a solution for which precision is less critical is a buffer solution used in a qualitative test, such as a pH indicator like bromothymol blue.
Precision is less critical in this case because the solution is used to observe a color change, which is not dependent on an exact concentration. The buffer solution maintains the pH of the system, allowing for a qualitative assessment.
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The mass of a sample of nickel (average atomic mass 58.69 u) is 11.74 g. How many atoms
does it contain?
The number of atoms present in 11.74 g of nickel sample is 1.2 × 10²³.
What is Avogadro's number?Avogadro's number is the number of entities present in one mole of any substance and its value is equal to 6.022 × 10²³.
Given that mass of nickel sample = 11.74g
Atomic mass of nickel sample = 58.69amu
Moles of this sample will be calculated as:
n = 11.74g / 58.69g/mol = 0.200 moles
No. of atoms in 0.200 moles = 0.200 × 6.022 × 10²³ = 1.2 × 10²³
Hence, required no.of atoms are 1.2 × 10²³.
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The mole idea is a useful way to indicate how much of a substance there is. Any measurement may be divided into two components: the magnitude in numerical terms and the units in which that magnitude is expressed. The number of atoms is 1.2 × 10²³.
Even one gram of a pure element is known to have an enormous number of atoms when working with particles at the atomic (or molecular) level. The mole idea is frequently applied in this situation. The unit of measurement that receives the most attention is the "mole," which is a count of a sizable number of particles.
Number of moles = Mass / molar mass
n = 11.74g / 58.69g/mol
n = 0.200 moles
No. of atoms in 0.200 moles = 0.200 × 6.022 × 10²³
N = 1.2 × 10²³
Hence, the required no.of atoms is 1.2 × 10²³.
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what happens when chloro Methane is heated with sodium in the presence of dry ether ?(wurtz reaction)
The Wurtz reaction occurs when chloromethane is heated with sodium in the presence of dry ether. The reaction produces two molecules of methane and sodium chloride.
Why is dry ether needed to make the Grignard reagent?Since it forms a stable complex when reacting with Grignard reagents, ether is also utilised as a solvent. The ionic magnesium-halogen link dissolves the ether's carbon-oxygen bond, creating a stable complex and enhancing the Grignard reagent's reactivity.
When dry ether is present, what is treated with magnesium?Find out how Grignard's reagent affects carbonyl compounds. Based on this, you may use the reaction mechanisms for the specified named reactions to identify the first responding molecule.
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In question 19, we said intermolecular forces would cause pressure to be than predicted. is this observed in model 3? - 30326012.
Yes, the observation that intermolecular forces cause pressure to be lower than predicted is observed in Model 3.
The graph in Model 3 shows that the actual pressure is lower than the predicted pressure, indicating that intermolecular forces are at play. This phenomenon can be explained by the fact that the gas molecules are attracted to each other, which reduces their average kinetic energy and therefore reduces the pressure.
The more tightly the molecules are held together, the greater the reduction in pressure will be, as can be seen in the graph of Model 3. In summary, intermolecular forces do cause pressure to be lower than predicted, and this is observed in Model 3.
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what happens to the boiling point of hydrocarbon compounds when the number of carbon atom increases
A. Decreases
B. Increases
C. Remains the same
D. None of these
I NEED YOUR ANSWER RN GUYSS PLEASEE
Any change in average weather conditions on Earth that lasts for at least several decades is called
Answer:climate change
Explanation:
how can you determine the number of valence electrons in a atom of a representative element?
Answer:To determine the number of valence electrons in an atom of a representative element, you can look at its position on the periodic table. Representative elements are also known as the main group elements and are located in groups 1-2 and 13-18 of the periodic table.
The number of valence electrons in an atom of a representative element is equal to the group number. For example, the elements in group 1 (also known as the alkali metals) have 1 valence electron, while the elements in group 2 (the alkaline earth metals) have 2 valence electrons. The elements in group 13 (the boron group) have 3 valence electrons, and so on, up to group 18 (the noble gases), which have a full set of 8 valence electrons (except for helium, which has only 2).
For example, let's consider the element sodium (Na), which is in group 1. Sodium has 1 valence electron because it is in group 1. Similarly, the element carbon (C), which is in group 14, has 4 valence electrons because it is in group 14.
Knowing the number of valence electrons in an atom is important because it helps to determine the chemical properties and reactivity of the element. Atoms with the same number of valence electrons tend to have similar chemical properties and can form similar types of chemical bonds.
Explanation:
How many grams are in 869 moles of FeCL2?
The first step we have to follow is to find the molar mass of FeCl2 using the atomic masses of each element:
\(\begin{gathered} Fe=55.845g/mol \\ Cl=35.45g/mol\times2=70.9g/mol \\ FeCl_2=126.745g/mol \end{gathered}\)It means that each mole of FeCl2 has a mass of 126.745g/mol.
Use the molar mass to find the mass of the given amount of moles:
\(869molFeCl_2\cdot\frac{126.745gFeCl_2}{1molFeCl_2}=110,141.405gFeCl_2\)It means that there are 110,141.405 grams of FeCl2.
In scientific notation it would be 1.10x10^5g.
there are 110,141.405 grams of FeCl2
1. Which of the following is an example of chemical energy being converted into another form?
A. Paper being torn
OB. Heating cold water
C. Burning a log in a fireplace
D. A roller coaster going downhill
Answer:
C. Burning a log in a fireplace
Explanation:
Chemical energy is stored in the bonds between atoms and molecules and can be converted into another form of energy. This can occur through chemical reactions, such as combustion or decay.
An example of chemical energy being converted into another form is option C: Burning a log in a fireplace. In this example, the chemical energy stored in the wood is released through combustion, producing heat and light. The heat energy is then transferred to the surrounding air and environment, warming it up.
This is different from options A and B, which involve physical changes but not the conversion of chemical energy. Option D, a roller coaster going downhill, is an example of potential energy being converted into kinetic energy, but not of chemical energy being converted.
ALLEN
1. You may be using medium for shoot regeneration from leaf explants of a plant in Expt-5. The plant media may contain the plant growth regulators (hoones) BA and NAA. The molecular weight of BK is 72 A : and NAA is 186. The media is pH to 5.8. (a) Before making the plant media, you found the pH to be 3.6. What would you add quiekly to get it to a pH of 5.8 (give a specific name of the solution)? Why? (1 pt) (b) How much BA will be weighed fot a 1M solution? (Y po) (c) Convert your answer from (b) to mg/ml. (Y/ pt) (d) Convert your answer from (c) to mg 1 . (1 pt) (e) How much BA will be weighed for a 5mM solution? (1/4pt) (f) Convert your answer from (c) to mg/ml. ( /4pt ) (g) Convert your answer from (f) to mg/L. (H/ pt) (h) Your stock solution of BA is 5mM and your working solution is 0.2mg/.. What volume of the stoc be added to 250ml of medium? [Hint: fook at the previous answers Keep to 4 decimal pts.) (3 pts Convert your answer from (h) to μI, and which pipettor will you use to aliquot the B. A? (1 pt)
(a) To get the pH of the media to 5.8, you would add NaOH solution. NaOH is used as a basic solution, and when it is added to a solution, it will increase the pH of the solution.
(b) The molecular weight of BA is 225.3. To prepare a 1M solution, you would have to weigh out 225.3 grams of BA.(c) To convert a 1M solution of BA to mg/mL, you can use the following equation: 1 mole = molecular weight in grams; 1000 millimoles = 1 mole. So, 1 M = 1000 mg/mL. Therefore, a 1M solution of BA is equivalent to 1000 mg/mL .(d) To convert a concentration of 1000 mg/mL .
Therefore, to calculate the weight required for a 5 mM solution, use the following formula :Mass of BA = molarity × volume × molecular weight= 5 × 0.001 × 225.3= 1.1265 grams(f) To convert a concentration of 5 mM to mg/mL, we use the following formula: Concentration (mg/mL) = (Concentration (mM) × Molecular weight) / 1000= (5 × 225.3) / 1000= 1.1265 mg/mL(g)
To convert a concentration of 1.1265 mg/mL to mg/L, we multiply by 1000, so 1.1265 mg/mL = 1126.5 mg/L.(h) Given that the stock solution of BA is 5 mM and the working solution is 0.2 mg/mL.
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Is Octylphenol ethoxylate a Slovent or Solute?
The element Eu occurs naturally as a mixture of 47.82% 152Eu, whose mass is 150.9 amu and
52.18% 153Eu, whose mass is 152.9 amu. Calculate the average atomic mass of Eu.
A.15.194 amu
B.151.94 amu
C.1519.4 amu
D.15194 amu
Answer:
M = 151.94 amu
Explanation:
It is given that,
The element Eu occurs naturally as a mixture of 47.82% 152 Eu, whose mass is 150.9 amu and 52.18% 153 Eu, whose mass is 152.9 amu. We need to find the average atomic mass of Eu. It can be calculated as follows :
\(M=47.82\%\ \text{of}\ 150.9+52.18\%\ \text{of}\ 152.9\\\\M=\dfrac{47.82}{100}\cdot150.9+\dfrac{52.18}{100}\cdot152.9\\\\M=151.94\ \text{amu}\)
So, the average atomic mass of Eu is 151.94 amu.
Perform the following
mathematical operation, and
report the answer to the correct number of significant figures.
7.68 x 4.564 = [?]
In ____________, particles change directly from a solid to a gas
Answer:
Sublimation.
Explanation:
Sublimation is the conversion between the solid and the gaseous phases of matter, with no intermediate liquid stage
Which element below would most likely gain 3 electrons?
Answer:
Lithium
Explanation:
C.
Calculate the number of moles in 62g of CO2
Answer:
32÷5
I'm just tryna get points I'm sorry
goodluck tho❤
PLZ HELP
In this activity, you’ll conduct research about the savanna biome, a type of grassland. Use credible websites to gather information on these points:
the location of the savanna on Earth
the conditions in the savanna (temperature, precipitation, etc.)
the living things that make up this ecosystem (Identify all forms: plants, prey animals, and predators, for example.)
the nonliving components that make up the environment
After you’ve completed your research, answer the following questions.
Part A
Summarize your research, and describe the attributes of the savanna.
Answer:
Savannas are grasslands found in Africa, Australia, South America, and India. The climate is warm or hot. Savannas experience both dry and rainy seasons. Each year, savannas receive about 20 to 50 inches of rain in a span of six to eight months. The other months are dryer. There’s also a threat of wildfires because of the severe dryness during these months. Grasslands are true to their name because their vegetation is mostly grass. Savannas are home to a wide range of animals, including different species of beetles and insects, which many creatures consume. Squirrels, mice, elephants, gazelles, and antelopes are the plant-eating animals that live in the savanna. Hyenas, lions, and leopards are some of the meat-eating animals in these areas. Some of the nonliving components of the system include very porous soil that allows water to drain easily.
Explanation:
this is the edmentum answer :)
Which of the following terms best describes a substance that binds to the active site and causes enzyme inhibition and that inhibition decreases with increasing substrate concentration?
choose an option:
a) competitive inhibitor
b) irreversible inhibitor
c) mixed inhibitor
d) uncompetitive inhibitor.
The correct option that best describes a substance that binds to the active site of an enzyme and causes inhibition, with inhibition decreasing with increasing substrate concentration, is option (a) competitive inhibitor.
A competitive inhibitor is a substance that competes with the substrate for binding to the active site of an enzyme. It binds reversibly to the active site, forming an enzyme-inhibitor complex. Importantly, the competitive inhibitor's binding to the active site can be overcome by increasing the substrate concentration.
This is because a higher substrate concentration increases the likelihood of substrate molecules binding to the active site, outcompeting the inhibitor and reducing the inhibitory effect. As a result, the inhibition decreases with increasing substrate concentration.
In contrast, irreversible inhibitors (option b) bind covalently to the enzyme and cannot be easily displaced. Mixed inhibitors (option c) can bind to both the free enzyme and the enzyme-substrate complex, exhibiting a mixed pattern of inhibition. Uncompetitive inhibitors (option d) bind to the enzyme-substrate complex and only inhibit the catalytic activity when the complex is formed.
Thus, based on the given information, the substance that best fits the description is a competitive inhibitor.
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"Cracks" are placed between sidewalk concrete to prevent damage because, when heated, the concrete will undergo _____________. Please need help really bad !!
A. Pressure expansion
B. Volume expansion
C. Thermal expansion
D. Solid expansion
What is the∆S° of 0₂
Answer:0
Explanation: zero because it is the most stable form of oxygen in its standard state
The pressure of a 4. 3054 mol sample of hydrogen gas in a 15. 732 L container is measured to be 5. 2672 atm. What is the temperature of this gas in degrees Celsius?
The temperature of gas with all the given conditions comes out to be 1002.94 °C.
Given to us is
P = 5.2672 atm
V = 15.732 L
n = 4.3054 mol
R = 0.0821 L·atm/(mol·K)
To calculate the temperature of the gas, we can use the ideal gas law equation:
PV = nRT
Where:
P = pressure of the gas
V = volume of the container
n = number of moles of gas
R = ideal gas constant
T = temperature of the gas
First, let's rearrange the equation to solve for T:
T = (PV) / (nR)
Now, we can substitute the values into the equation and calculate T:
T = (5.2672 atm × 15.732 L) / (4.3054 mol × 0.0821 L·atm/(mol·K))
T = 1276.0909 K
To convert the temperature to degrees Celsius, we subtract 273.15:
T = 1276.0909 K - 273.15
T = 1002.94 °C
Therefore, the temperature of the gas is approximately 1002.94 °C.
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1. Calculate the percent yield of a reaction that had a theoretical yield of 3.76 g and an actual
yield of 1.45 g.
Taking into account the definition of percent yield, the percent yield of a reaction that had a theoretical yield of 3.76 g and an actual yield of 1.45 g. is 38.56%.
Definition of percent yieldThe percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.
The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:
percent yield= (actual yield÷ theoretical yield)×100%
where:
The actual yield is the actual amount of product obtained when a chemical reaction is carried out.The theoretical yield of a reaction is the amount of product that must be obtained from the reagents used, if the conditions in which it is carried out are perfect and there is no leakage of products..Percent yield for the reaction in this caseIn this case, you know:
actual yield= 1.45 gramstheorical yield= 3.76 gramsReplacing in the definition of percent yield:
percent yield= (1.45 grams÷ 3.76 grams)×100%
Solving:
percent yield= 38.56%
Finally, the percent yield is 38.56%.
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Please helpp!!!!
1. Covering with greases on the iron makes _____________ .
1. stopping air and water from being in contact with the iron.
2. reacting with oxygen and/or water instead of iron
3. slipping the foreign materials
2. Which substance can react with copper to make copper carbonate?
3. What is the product of the combustion reaction of lithium.
4. In presenting the evidence in the table, the variable you change is written in the ___________.
1. left column
2. middle column
3. left row
4. right column
5.The iron corrosion, rusting, can be prevented by coating with __________, __________ and __________ .
6.In the chemical reaction, the substances you end up with are different from the ones you started with is called __________.
1. are not reversible
2. create new substances
3. compound
4. mixture
7. A ______________ is a chemical reaction that happens on the surface of a metal.
1. combustion reaction
2. corrosion reaction
3. metal reaction
4. acid reaction
8.In a chemical equation, the reactants and products are ____________ from each other.
1.different
2. the same
3. separated
4. obtained
9. As silver reacts with polluted air, a black compound, _____________ is formed.
1.silver carbonate
2. silver sulfide
3. silver oxide
4. silver alloy
1) Covering with greases on the iron stops air and water from being in contact with the iron.
2) The substance that can react with copper to make copper carbonate is silver carbonate
3) The combustion of lithium produces lithium oxide
4) The table is not shown hence the question can not be answered
5) another metal, oil and grease
6) The chemical reaction creates new substances.
7) A corrosion reaction is a chemical reaction that happens on the surface of a metal.
8) .In a chemical equation, the reactants and products are different from each other.
9) As silver reacts with polluted air, a black compound, silver oxide is formed.
What is oxidation?In the process of oxidation, we are just burning up a substance in oxygen. When we burn the substance in oxygen, there is an increase in the oxidation number of the object and oxygen is also added to the object. This is what we call oxidation of a substances.
Now we know that oxygen is abundant in the universe and thus it can be used in the burning of a substances. In effect we can look at the process of combustion as a situation in which we burn an object in air.
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Question 11
Which formula represents a hydrocarbon?
C₂H6
C₂H5OH
C₂H5Cl
C₂H6O
Answer:
C₂H6
Explanation:
Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A
A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:
A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.
B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.
C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.
D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.
Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.
In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A
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copper plays a role in connective tissue formation as a component of lysyl oxidase.
True or false
True. Copper does indeed play a role in connective tissue formation as a component of lysyl oxidase.
Copper is an essential trace element that is involved in various biological processes in the human body. One of its crucial roles is as a component of lysyl oxidase, an enzyme responsible for the cross-linking of collagen and elastin in connective tissues. Collagen and elastin are key components of connective tissue, providing strength, elasticity, and structural support to various body parts such as skin, blood vessels, tendons, and ligaments.
Lysyl oxidase requires copper as a cofactor to catalyze the chemical reactions that facilitate the cross-linking process. Without sufficient copper, the activity of lysyl oxidase can be impaired, leading to abnormalities in connective tissue formation and function. Therefore, it is true that copper plays a vital role in connective tissue formation as a component of lysyl oxidase.
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