Aldol condensation involves the reaction of an acid or base with a carbonyl group producing a nucleophile that attacks another carbonyl compound to yield a β-hydroxyaldehyde or β-hydroxyketone compound.
What is aldol condensation?The aldol condensation is a reaction in organic chemistry in which there is a reaction between an acid or base and a carbonyl group which then serves as the nucleophile that attcks a second carbonyl to yield a β-hydroxyaldehyde or β-hydroxyketone compound.
The aldol condensation may be acid catalysed or base catlysed. The question is incomplete hence the complete mechanimsms can not be decuced.
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At 25°C, which 5.0 g Zn sample will react the fastest with dilute HCÚ?
A)
bar
B)
lump
C)
powdered
D)
sheet metal
powdered because it has more surface area which leads means there are more reactant particles exposed to collide, therefore the successful collision rate increases, resulting in an increased rate of reaction.
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How is a double displacement reaction completed and balanced
A double displacement reaction is a type of reaction in which two reactants exchange ions to form two new compounds. Many double displacement reactions occur between ionic compounds that are dissolved in water. A double replacement reaction is represented by the general equation.
Draw the structures, including stereochemistry, of the two intermediates and the final product. Use wedge‑and‑dash bonds and hydrogens on chirality centers
The structures of the two intermediates and the final product of the Grubbs catalysis reaction are shown in the attached image, with emphasis on the stereochemistry of the two intermediates and the end product.
What are intermediates?Intermediates are those species which are formed during the process of any chemical reaction which in turn finally converts into products.
Stereochemistry is a discipline of chemistry that studies the three-dimensional structure of molecules and how it influences their physical and chemical properties.
According to the question it is discussing about the Grubbs catalysis reaction which is a transition metal carbene series complex in which mixture of two optical active compounds are obtained which are the intermediates which finally gives product after reduction.
Hence the required structures are shown in the attached image.
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The main purpose of homeostasis is to
A. fight disease-causing organisms.
B. keep internal conditions stable.
C. produce offspring.
D. replicate DNA.
Round the mmHg readings to the nearest whole number. Round the kPa readings to the nearest tenth. Round the atm readings to the nearest hundredth. Convert a pressure of 1.76 atm to _____ torr.
i love jesus and i love my mommy
In a molecule of water (H2O), two hydrogen atoms are each bonded to one oxygen atom. What forms each of the two bonds?
Jesse is riding the bus home from school. He is moving away at 30 miles per hour. From which reference point would this description be correct? A. Jesse's home B. the driver of the bus C. the school D. another student on the bus
Answer:
the correct answer is going to be the school
How can I identify which substance is more thermal stable?
which can provide the MOST energy in a ecosystem? a mushroom,coyote,a pine tree,a grassy meadow
Answer:
a grassy meadow
Explanation:
goo
duh
A chemist reacted 12.0 liters of F2 gas with NaCl in the laboratory to form Cl2 gas and NaF. Use the ideal gas law equation to determine the mass of NaCl that reacted with F2 at 280. K and 1.50 atm.
Answer:
The mass of NaCl needed for the reaction is 91.61 g
We'll begin by calculating the number of mole of F₂ that reacted.
Volume (V) = 12 L
Temperature (T) = 280 K
Pressure (P) = 1.5 atm
Gas constant (R) = 0.0821 atm.L/Kmol
Number of mole (n) =?
PV = nRT
1.5 × 12 = n × 0.0821 × 280
18 = n × 22.988
Divide both side by 22.988
n = 18 / 22.988
n = 0.783 mole
Next, we shall determine the mole of NaCl needed for the reaction.
F₂ + 2NaCl —> Cl₂ + 2NaF
From the balanced equation above,
1 mole of F₂ reacted with 2 moles of NaCl.
Therefore,
0.783 mole F₂ will react with = 0.783 × 2 = 1.566 moles of NaCl.
Finally, we shall determine the mass of 1.566 moles of NaCl.
Mole = 1.566 moles
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol
Mass of NaCl =?
Mass = mole × molar mass
Mass of NaCl = 1.566 × 58.5
Mass of NaCl = 91.61 g
Therefore, the mass of NaCl needed for the reaction is 91.61 g
Explanation:
Algae are microscopic plants that grow in the ocean. Algae must have sunlight, nutrients, and water to survive. They conditions are called _______
for algae.
The condition is called phytoplankton because algae are microscopic, need sunlight and nutrient, water to survive.
What is phytoplankton?Phytoplankton refers to microscopic marine algae and they are also called microalgae.They are similar to terrestrial plants in that they contain chlorophyll and require sunlight in order to live and grow. Most phytoplankton are very buoyant and float in the upper part of the ocean, where sunlight enter the water and they get the sunlight to produce food.
Algae photosynthesized,that is they use sunlight in the presence of chlorophyii and carbondioxide to produce food and oxygen.
Therefore, The condition is called phytoplankton because algae are microscopic, need sunlight and nutrient, water to survive.
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Describe how you use two living and two nonliving natural resources every day.
Answer:
Well, if you live on a farm, you have to feed the living animals and when you eat, you use a fork, knife, napkin, chair and those are all nonliving.
Explanation:
Also, if your trying to go on a scavanger hunt, and you pick up an animal then you are interacting with a living resource. Also water can be counted as both because water isnt alive but it can be used on living things. like if you were to drink it or water the plants.
Answer:
I use plant and dog as living things and mobile and dish as non living things everyday.
Explanation:
I use plants to get oxygen, vegetables and herbs and dog to help me to protect my home everyday. similarly, I use mobile to call others and I use dish to eat food everyday.
What types of R groups can exist in amino acids? (Choose all that apply)
Acidic
Non-polar
Basic
Polar
Answer:
acidic,non polar,basic
Explanation:
that’s the ones I put and I got a 100% on my test just now
The types of R groups that can exist in amino acids include acidic, non-polar, basic, and polar groups.
1. Acidic R groups: These groups have a negative charge and can donate a proton (H+). An example of an amino acid with an acidic R group is aspartic acid (Asp) or glutamic acid (Glu).
2. Non-polar R groups: These groups are hydrophobic and do not have a charge. They are composed mainly of carbon and hydrogen atoms. Examples of amino acids with non-polar R groups include alanine (Ala), valine (Val), and phenylalanine (Phe).
3. Basic R groups: These groups have a positive charge and can accept a proton. An example of an amino acid with a basic R group is lysine (Lys) or arginine (Arg).
4. Polar R groups: These groups are hydrophilic and have a partial charge. They can form hydrogen bonds with other polar molecules. Examples of amino acids with polar R groups include serine (Ser), threonine (Thr), and asparagine (Asn).
Thus, types of R groups that can exist in amino acids include acidic, non-polar, basic, and polar groups.
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Hurrrryyyyy pls
Based on the experiment below, what was the dependent variable?
Bean
Soil
Bean
Soil
Bean
Soil
Height 20.4 cm
Mass: 159
Height: 45.7 cm
Mass: 6.19
Height: 46.5 cm
Mass: 6.69
LI
Daily water 10 mL
A Daily water 50 mL
B
Daily water 100 mL
С
Answer:
The growth of the plant
Explanation:
The growth of the plant from the bean soil is the dependent variable I believe. This is because it could change depending on many factors for e.g. the amount of light or water
4.
Solve: For each chemical equation below, write the number of product molecules that
will form from the reaction. Then circle the limiting reactant. (Note: The coefficients in
front of the reactants indicate the number of reactant molecules or atoms present.)
For all the reactions listed, the moles of products and limiting reactants are;
1. Molar cofficient - 6, oxygen is the limiting reactant
2. Molar coefficient - 8 chlorine is the limiting reactant
3. Molar coefficient - 4 and CO2 is the limiting reactant
What is a chemical reaction?
A chemical reaction is a combination of reactants that yields products. Recall that the limiting reactant is the reactant that nis present in the least amount.
Let us now complete each reaction;
1. The molar coefficient of the product in reaction 1 is 6 and oxygen is the limiting reactant
2. The molar For all the reactions listed coefficent of the product in reaction 2 is 8 and chlorine is the limiting reactant
3. The molar coefficient of the product in reaction 3 is 4 and the limiting reactant is CO2.
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5.00 L of a gas is known to contain 0.965 mol. If the amount of gas is increased to 1.80 mol, what new volume will result ( at an unchanged temperature and pressure) ?
SHOW YOUR SOLUTION.
At an unchanged temperature and pressure, if the amount of gas increased by the given value, the final or new volume of the gas is 9.33L
Avogadro's lawAvogadro's law states that equal volumes of different gases contain an equal number of molecules provided temperature and pressure remains in the same conditions. It is expressed;
V₁/n₁ = V₂/n₂
Given the data in the question;
Initial volume; V₁ = 5.0L Initial amount of gas; n₁ = 0.965mol Final amount of gas; n₂ = 1.80mol Final volume; V₂ = ?To determine the new volume, we substitute our given values into the expression above.
V₁/n₁ = V₂/n₂
V₁n₂ = V₂n₁
V₂ = V₁n₂/n₁
[tex]V_2 = \frac{5.00L * 1.80mol}{0.965mol}\\\\V_2 = \frac{5.00L * 1.80}{0.965}\\\\V_2 = \frac{9L}{0.965} \\\\V_2 = 9.22L[/tex]
Therefore, at an unchanged temperature and pressure, if the amount of gas increased by the given value, the final or new volume of the gas is 9.33L
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A 100g block of pine wood has a volume of 300 cm3. Would this block float on water (density of water is 1.0 g/cm3)?
A 120g block of pinewood has a volume of 300cm3. Would this block float on water? (HINT: Water has a density of 1g/cm3). a. No, because the block is denser than water.
Also here's a free meme
The density of a material represents the denseness of that material in a specific given area. If an object has a density less than water then it will float on water otherwise it will sink. Here the wood will float on water.
What is density?The density of a material denotes the measurement which compares the amount of matter an object has to its volume. An object with more matter in a certain volume has a high density. It is defined as the mass per unit volume.
The density is usually represented by symbol ρ or by the letter D. The formula used to calculate the density is:
Density = Mass / Volume
D = 100 / 300 = 0.33 g/cm³
Here the density of water is 1.0 g/cm³ which is greater than the density of pine wood. So the pine wood will float on water.
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why is the non-luminous flame preferred for heating?
Answer:
Because it is the hottest zone
Answer:
the non luminous flames are very hot. little light is produced by non luminous flames.
Which statement best describes the use of a chemical indicator in a titration? It must be measured to the nearest 0. 01 mL. It must be colored in the acid solution. It must measure pH directly at all pH values. It must change color near the equivalence point.
The statement that best describes the use of a chemical indicator in a titration is it must change color near the equivalence point.
What are indicators?Indicators are those compounds which are used in the titration process to estimate the presence of chemical entities in it.
In the titration process, indicator is added in the titration solution which changes its color when the reaction mixture goes towards the equivalence point and becomes disappear at that point.
Hence option (4) is correct.
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___ Uses moving air and doesn't pollute the atmosphere.____ uses dead plant matter and burning it releases carbon emissions into the atmosphere.
1. 2.
a. Biomass Energy a. Biomass Energy
b. Solar energy b. Solar energy
c. Hydropower Energy c. Hydropower energy
d. Wind Energy d. Wind Energy
Answer: 1 d. Wind Energy 2. a. Biomass Energy
Explanation:
The use of the moving air has been found to use wind energy, and the dead plants burning is formed with the biomass energy.
What is energy?The energy has been given as the required form to perform a task. The energy can be generated with the pressure and the force of various matters.
Wind energy is produced with the use of the moving air and has been a clean form of energy, i.e. not pollute the region.
The biomass energy has been produced with the use of the dead plants and the matter and releases carbon dioxide.
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What is the role of meteorites in the formation of life?
Answer:
Meteorites are consensually considered to be involved in the origin of life on this Planet for several functions and at different levels: (i) as providers of impact energy during their passage through the atmosphere; (ii) as agents of geodynamics, intended both as starters of the Earth’s tectonics and as activators of local hydrothermal systems upon their fall; (iii) as sources of organic materials, at varying levels of limited complexity; and (iv) as catalysts.
Explanation:
A student creates a model that displays a cross-section of a metal wire wrapped in plastic insulation. Which statement best describes the metal wire?
A. The metal wire is an element.
B.The metal wire is a compound.
C. The metal wire is a homogenous mixture.
D. The metal wire is a heterogeneous mixture.
Cross-section of a metal wire wrapped in plastic insulation the metal wire is an element.
What is an element?An element is a substance or material that cannot be affected by an external substance or cannot be broken down by any reaction.
Metal wire is serving as an element, it should not be easily broken or penetrated as an insulator.
Therefore, Cross-section of a metal wire wrapped in plastic insulation the metal wire is an element.
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A 1.775g sample mixture of potassium hydrogen carbonate is decomposed by heating. if the mass loss is 0.275g what is the percentage of khco3
A 1.775g sample mixture of KHCO₃ is decomposed by heating. if the mass loss is 0.275g, the mass percentage of KHCO₃ is 70.4%.
What is a decomposition reaction?A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.
Step 1: Write the balanced equation for the decomposition of KHCO₃.2 KHCO₃(s) → K₂CO₃(s) + CO₂(g) + H₂O(l)
The mass loss of 0.275 g is due to the gaseous CO₂ that escapes the sample.
Step 2: Calculate the mass of KHCO₃ that formed 0.275 g of CO₂.In the balanced equation, the mass ratio of KHCO₃ to CO₂ is 200.24:44.01.
0.275 g CO₂ × 200.24 g KHCO₃/44.01 g CO₂ = 1.25 g KHCO₃
Step 3: Calculate the mass percentage of KHCO₃ in the sample.There are 1.25 g of KHCO₃ in the 1.775 g sample.
%KHCO₃ = 1.25 g/1.775 g × 100% = 70.4%
A 1.775g sample mixture of KHCO₃ is decomposed by heating. if the mass loss is 0.275g, the mass percentage of KHCO₃ is 70.4%.
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3. Explain why an aluminum ion (A13+) is smaller than a sodium ion (Na+).
Answer:
This question is hard :( I dont know im so sorry
Explanation:
i need help from the problem below
Answer:
I won't say I'm confident with this because I'm not sure if the second one is even correct, but I hope I helped you and didn't make things worse lol.
What is the attraction between water molecules called?.
A rigid, non-flexible container of O2 gas is being transported to a hospital. What will most likely happen if the vehicle is left unattended and the temperature of the O2 rises?
A. The pressure will increase and the container will leak or explode. B. The pressure will decrease and the container will leak or explode. C. The pressure will increase, but the particles will condense within the container. D. The pressure will decrease and the container will maintain its current temperature.
If the temperature of the O2 in the container rises as a result of being abandoned for quite some time, the pressure in the container will increase and this may either lead to an explosion or leakage of the gas.
What is the relationship between temperature and pressure of a gas?At constant volume, the pressure of a gas increases with increased temperature as a result of an increase in the average kinetic energy of the gas molecules which increases the collision rate among the molecules.
Thus, if the temperature of a gas in a container increases, the pressure inside the container will also increase. This may lead to the gas leaking from the container or the container may even outrightly explode due to pressure.
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Describe the patterns that can be observed for elements on a Periodic table.
Answer:
mark brainliestbrainliestbrainliest.
Explanation:
The periodic table is an arrangement of the elements in order of increasing atomic number. Elements that exhibit similar chemistry appear in vertical columns called groups (numbered 1–18 from left to right); the seven horizontal rows are called periods.
What portion of your salt solution in ice water system is: a. A mixture? b. A solution?
The salt and water are a homogeneous mixture but when salt dissolves in the water system is called a solution of salt and water.
What is a mixture?A mixture is defined as the combination of two or more substances that are not chemically bonded together.
There are two types of mixture which include:
Homogeneous (uniform composition) andHeterogeneous mixturesWhen salt is added to the ice water system, it lowers the freezing point of the ice water thereby forming a homogenous mixture of water and salt.
The dissolution of salt in ice water leads to the formation of salt and water solution.
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A gas sample has a temperature of 19 °C with an unknown volume. The
same gas has a volume of 464 mL when the temperature is 90. °C, with no
change in the pressure or amount of gas.
Answer: 373 mL
Explanation:
Since there is no change in pressure, the formula: V / T = V / T can be used.
However, you must first convert the temperatures to Kelvin by adding 273 to them:
(19 + 273) = 292K and (90 + 273) = 363K.
Now, plug in: V / 292 = 464 / 363 → V = 373 mL :)