Answer:
When a solid is heated the particles gain energy and start to vibrate faster and faster. ... At this point the solid is melting to form a liquid. The particles in the liquid are the same as in the solid but they have more energy.
Explanation:
sana maka help
2.0 mole of water at STP would occupy what volume?
a) 22.4
b) 22.7
c) 44.8
d) 45.4
plzzz help me
Are real or ideal gases used in labs?
I NEED HELP PLS ;-; !!!!
Identify the number of electrons each of the following atoms needs to gain or lose to have a stable outer electron configuration.
a. sodium (Na)
b. strontium (Sr)
c. sulfur (S)
d. astatine (As)
Match the procedural step to its purpose by dragging each step in the written procedure for the Fischer esterification of benzoic acid with methanol in the presence of mineral acid into the appropriate box. Purpose: Flat-bottomed flasks transfer heat in an uneven fashion, and may fracture if heated strongly. Procedure: Purpose: Methanol, which is used as a reagent and solvent, is flammable. Prodedue: Purpose: The unreacted carboxylic acid was neutralized under mild conditions. Procede: Purpose: Water needs to be removed before the liquid ester product is collected. Procedure:
Answer:
Explanation:
The task in this question is to match the right procedure to its purpose. It explains the procedure for the preparation of Fischer Esterification. Fischer Esterification Mechanism should incorporate the ceaseless expulsion of water from the framework or the use of a huge amount of excess alcohol since the general reaction is reversible. Fischer Esterification act as an organic reaction that is utilized to change over carboxylic acids within the sight of excess alcohol and a solid corrosive catalyst (acid) to give an ester as the eventual outcome.
Procedure Purpose
[tex]\text{Flat bottomed flask transfer}\\ \\ \text{ heat in an uneven fashion and } \\ \\ \text{ may fracture if heated strongly}[/tex] [tex]\text{The reagents were added to a} \\ \\ \text{round bottom flask prior to the }\\ \\ \text{reaction being heated under reflux}[/tex]
[tex]\text{Methanol which used as a reagent} \\ \\ \text{and solvent is flammable}[/tex] [tex]\text{The solution of benzoic acid and }\\ \\ \text{methanol was heated on steam bath}[/tex]
[tex]\text{The unreacted carboxylic acid was} \\ \\ \text{neutralized under mild conditions}[/tex] [tex]\text{The reaction mixture was washed} \\ \\ \text{ with sodium bicarbonate solution}[/tex]
[tex]\text{Water needs to be removed before the} \\ \\ \text{ liquid ester product was collected}[/tex] [tex]\text{Magnesium sulphate is added to the} \\ \\ \text{ dichloromethane layer before} \\ \\ \text{ the solvent is distilled off}[/tex]
Newton's second law states that force is equal to
mass times weight
mass times acceleration
weight divided by mass
weight times acceleration
Describe the stages of water cycle
Help pleaseeeeeee
Using your knowledge of alpha beta and Gamma decay and your periodic table practice using your ideas by completing the following equations
Answer:
20. ²⁴¹₉₅Am —> ²³⁷₉₃Np + ⁴₂He
21. ⁴²₁₉K —> ⁰₋₁β + ⁴²₂₀Ca
Explanation:
20. ²⁴¹₉₅Am —> __ + ⁴₂He
Let ⁿₘX be the unknown.
Thus, the equation becomes:
²⁴¹₉₅Am —> ⁿₘX + ⁴₂He
Next, we shall determine n, m and X. This can be obtained as follow:
241 = n + 4
Collect like terms
n = 241 – 4
n = 237
95 = m + 2
Collect like terms
m = 95 – 2
m = 93
Thus,
ⁿₘX => ²³⁷₉₃X => ²³⁷₉₃Np
Therefore, the complete equation is:
²⁴¹₉₅Am —> ²³⁷₉₃Np + ⁴₂He
21. __ —> ⁰₋₁β + ⁴²₂₀Ca
Let ʸₓZ be the unknown.
Thus, the equation becomes:
ʸₓZ —> ⁰₋₁β + ⁴²₂₀Ca
Next, we shall determine y, x and Z. This can be obtained as follow:
y = 0 + 42
y = 42
x = –1 + 20
x = 19
Thus,
ʸₓZ => ⁴²₁₉Z => ⁴²₁₉K
Therefore, the complete equation is:
⁴²₁₉K —> ⁰₋₁β + ⁴²₂₀Ca
words that mean the same thing
decrease,
diminish,
dwindle
Answer:
Subside
Explanation:
Answer:
lower, reduce, decline
Explanation:
In an experiment, the molar mass of the compound was determined to
be 228.276 g/mol. What is the molecular formula of the compound? Please help!
i really kinda need some hell right now :)
K2S(s) + MgI2 (aq) -----> ?
Answer:
MgS + KI = K2S + MgI2
50 points
In the image below, light is displayed as particles called photons. Research to find out what photons are and then explain in your own words why they can be useful for modeling light.
Answer:
A photons is a particle representing a quantum of light or other electromagnetic radiation. A photon carries energy proportional to the radiation frequency but has zero rest mass.
Explanation:
Light consists of packets of energy (photons) that can only interact with the atoms and molecules of matter by being absorbed or emitted in discrete units. ... Photons carry momentum and energy like particles, but they also have a frequency and a wavelength like a sinusoidal wave. Thanks to photons we know that all quantum particles have both the properties of waves and particles. I hope it helps✌️
FIRST CORRECT ANSWER GETS 10 POINTS!!!!
Which explains how the nervous system is typically involved in keeping the body in homeostasis?
It processes the environment and sends out signals.
It controls movement and provides structure.
It physically breaks down and absorbs food.
It puts oxygen in the blood, which is essential for life.
Answer:
Explanation:
It processes the environment and sends out signals.
in the ideal gas law which variable represents the gas constant?
a: T
b: R
c: n
d: V
e: P
Explanation:
It is represented using the ideal gas equation , or PV = nRT, where P is the pressure in atmospheres, V is the volume in liters, n represents the quantity of particles in the container, T represents the temperature in Kelvin, and R is the ideal gas constant equal to 0.0821 liters atmospheres per moles Kelvin.
A self-aldol or crossed aldol reaction REQUIRES a(n) ___________________. Group of answer choices strong acid only a very, very strong base, such as LDA (lithium diisopropyl amide), NaOH or LiOH won't work acid catalyst a strong base such as LiOH or NaOH
Answer:
[tex]\mathbf{a \ strong \ base \ such \ as\ LiOH \ or \ NaOH.}[/tex]
Explanation:
In the condensation reactions of carbonyl compounds, it is essential to establish the order of events in advance to minimize or suppress the possibilities of self-condensation and the occurrence of cross-condensation, which unfortunately are an obvious threat in these reactions.
Self-condensation:
Any carbonyl compound that has one or more alpha hydrogens, on the carbons adjacent to the carbonyl group, runs the risk of undergoing a self-condensation reaction if the corresponding rigor is not carried out.
Cross-condensation:
Ideally, in the condensation reactions of carbonyl compounds, one of the reacting molecules should quickly enolise, while the other preferably should not have Hα, to ensure that no other by-products are formed.
[tex]\text{To achieve this process;}[/tex] [tex]\text{A self-aldol or crossed aldol requires a strong base such as LiOH or NaOH.}[/tex]
why does ocean water found near the poles often have a higher leaves of salinity than ocean water found near the equator
The ocean water found near the poles has a higher level of salinity because the area of rain reduces as one moves toward the poles, and as a result of less rain and more sunshine, evaporation increases.
What is salinity?Salinity is the presence of salt in the water. Freshwater bodies have very less amount of salt, but ocean water has a large amount of salt dissolved in it.
Because cold polar air cools the water and decreases its temperature, raising its salinity, water close to the poles frequently has more salinity. When fresh water freezes out of seawater to form sea ice, the salinity of the remaining water likewise rises.
Therefore, as one travels toward the poles, the area of rain decreases, and as a result of less rain and more sunshine, evaporation increases, and the ocean water there has a higher level of salinity.
To learn more about salinity, refer to the link:
https://brainly.com/question/11798887
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The molecule with only single covalent bonds is _. (C) *
CO2
СО
CI2
ON2
Answer:
CO (carbon monoxide)
Explanation:
If you were sitting near a gram of protactinium-234 and a gram of uranium-234, both solid materials, which would you consider more dangerous to you?
aswer: protactinium-234 is more dang erous than uranium
There can be emissions of radiations like gamma radiation. There can be emission of particles too like alpha particle. Therefore protactinium-234 is more dangerous than uranium-234.
What is nuclear decay?Nuclear decay is process in which the radioactive element releases particles or radiations. Alpha particles is ⁴₂He. Alpha particle is nothing but helium particle. Protactinium-234 and uranium-234 are radioactive element.
If we were sitting near a gram of protactinium-234 and a gram of uranium-234, both solid materials then protactinium-234 is more dangerous than uranium-234. The half-life of protactinium-234 is smaller than that of uranium-234. So, protactinium-234 is more active than uranium-234 and hence more harmful than uranium-234.
Therefore, protactinium-234 is more dangerous than uranium-234.
To know more about nuclear decay, here:
https://brainly.com/question/21114779
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Calculate the formula weight or molecular for the following:
a. LiCI
b. SO2 (The 2 is in subscript)
Answer:
42.39, 64.06
Explanation:
Formula Weight can be calculated by adding the atomic mass of the elements in the formula.
LiCl
AM for Li is 6.94 amu, AM for Cl is 35.45 amu
[tex](6.94)+(35.45)=42.39[/tex]
SO₂
AM for S is 32.06 amu, AM for O is 16 amu
[tex](32.06)+2(16.00)=64.06[/tex]
Softening of water is the application of
Answer:
Water softening is the process of removing the dissolved calcium and magnesium salts that cause hardness in water
Explanation:
Help please...........
Prometheus is a character that stole fire from the gods in Greek mythology. Which element is named from Prometheus?
Answer:
Promethium
Pm 61
Discovered by Jacob .A. Marinsky
answer with explanation and you’ll get brain list
Answer:
Option D.
Explanation:
6H₂ + P₄ → 4PH₃First we convert the given reactant masses into moles, using their respective molar masses:
4.00 g H₂ ÷ 2 g/mol = 2 mol H₂6.20 g P₄ ÷ 124 g/mol = 0.05 mol P₄0.05 moles of P₄ would react completely with (6*0.05) 0.3 moles of H₂. There are more H₂ moles than required, meaning H₂ is in excess and P₄ is the limiting reactant.
Now we calculate how many PH₃ moles could be formed, using the number of moles of the limiting reactant:
0.05 mol P₄ * [tex]\frac{4molPH_3}{1molP_4}[/tex] = 0.2 mol PH₃Finally we convert 0.2 mol PH₃ into grams, using its molar mass:
0.2 mol PH₃ * 34 g/mol = 6.8 gSo the correct answer is option D.
According to an energy pyramid model, which trophic level is expected have the largest biomass in land ecosystems ?
Answer:
According to an energy pyramid model, Producer is expected have the largest biomass in land ecosystems
Explanation:
In a trophic level, the producers possess the largest biomass. With the increasing trophic level, the biomass reduces. Hence, the producers at the base have high biomass.
On terrestrial ecosystem, the producers are the plants and trees and hence the greatest biomass exists in the plants and trees.
Hence, in an energy pyramid model, Producer is expected have the largest biomass in land ecosystems
A 1.250-g sample of benzoic acid, C7H6O2, was placed in a combustion bomb. The bomb was filled with an excess of oxygen at high pressure, sealed, and immersed in a pail of water which served as a calorimeter. The heat capacity of the entire apparatus (bomb, pail, thermometer, and water) was found to be 10.134 kJ/K. The oxidation of the benzoic acid was triggered by passing an electric spark through the sample. After complete combustion, the thermometer immersed in the water registered a temperature 3.256 K greater than before the combustion. What is DEcombustion per mole of benzoic acid burned
Answer:
3224 kJ/mol
Explanation:
The combustion of benzoic acid occurs as follows:
C₇H₆O₂ + 13/2O₂ → 7CO₂ + 3H₂O + dE
The change in temperature in the reaction is the change due the energy released, that is:
3.256K * (10.134kJ / K) = 33.00kJ are released when 1.250g reacts
To find the heat released per mole we have to find the moles of benzoic acid:
Moles benzoic acid -Molar mass: 122.12g/mol-:
1.250g * (1mol / 122.12g) = 0.0102 moles
The dE combustion per mole of benzoic acid is:
33.00kJ / 0.0102moles =
3224 kJ/mol
Which shape is being shown by the model?
In an extraction experiment similar to your expt. 4, you attempt to separate 2-naphthol from cyclohexane, both of which are dissolved in ether. You attempt the separation by extracting the organic layer with a Ì´5% NaOH (aq) solution (made by adding 5.00 g of NaOH to every 100 mL of water). Assuming that all of the base present in the aqueous solution reacts with the phenol during your extractions, what is the minimum volume of the aqueous NaOH solution needed to deprotonate 20.0 g of 2-naphthol in order to extract it into the water layer? Clearly show all calculations. After removal of the phenol from the ether layer, only cyclohexane would remain. Concisely explain how you could efficiently isolate relatively pure cyclohexane from the ether layer.
Answer:
[a]. 108 mL.
[b].
1. use HCL in washing for the neutralization of NaOH.
2. Wash with water.
3. make use of MgSO4 to remove water traces.
4. Evaporate to get the pure cyclohexane
Explanation:
The chemical equation for the reaction between 2-naphthol and Sodium hydroxide is given below as:
C₁₀H₈O + NaOH --------------------------------------------------> C10H7O⁻ Na⁺ + H₂O.
The C10H7O⁻ Na⁺ is the aqueous phase.
The molarity of Sodium Hydroxide is = [ (mass of sodium hydroxide ) ÷ molar mass sodium hydroxide × volume] × 1000.
The molarity of sodium hydroxide = [ (5/40) × 100] × 1000 = 1.25 M.
The number of moles of 2-naphthol = mass / molar mass = 20 / 144.17 = 0.138 moles.
Recall that, the formula for the number of moles = concentration × volume. Therefore, the volume of sodium hydroxide is given below as:
Volume of sodium hydroxide = the number of moles of sodium hydroxide ÷ concentration of sodium hydroxide = 0.138 ÷ 1.25 = 0.108L = 108 mL.
In order to efficiently isolate relatively pure cyclohexane from the ether layer, the following process must be followed:
1. use HCL in washing for the neutralization of NaOH.
2. Wash with water.
3. make use of MgSO4 to remove water traces.
4. Evaporate to get the pure cyclohexane
what metric unit would be most appropriate to use when measuring the length of a paperclip?
A. millimeter
B. kilometer
C. decimeter
D. centimeter
centimetres
Explanation:
centimetres
Answer:
D. Centimeter is used when measuring the length of a paperclip
Sort the numbers based on the number of significant figures they have.
Drag each tile to the correct location.
One Significant
Figure
Two Significant
Figures
Three Significant
Figures
Four Significant
Figures
Answer:
I think one significant figure??
`1. the products in a reactions will always have...
(a) the same total mass as the reactants
(b)the same number of molecules as the reactants
(c) less mass than the reactants
(d) a greater number of molecules than the reactants
Answer:
a
Explanation:
as the law of conservation of matter (mass) states: matter can not be created nor destroyed but can transform from a form to another.
since the conversion of mass to energy can not be done except in nuclear reactions via (E= mc2). normal chemical equations must be balanced to achieve the law.