Answer:
Explanation: Brief description of demonstration
Three clear liquids form three distinct layers in a cylinder. Iodine crystals sprinkled on the top layer sink and form pink solutions with the top and bottom layers but do not dissolve in the middle. When the liquids are mixed, two layers form: a pink layer on the bottom, and a colorless layer on top. When white potassium iodide crystals are added and the liquids are mixed again, the colorless layer turns yellow.
Concepts illustrated:
• Phases and phase boundaries (surfaces)
• Density
• Polar/non-polar (hydrophilic/hydrophobic) interactions
• Solubility, miscibility
• Chemical reaction
• Extraction
• [Solution and emulsion]
Materials
• Clear glass reaction cylinder or gas-washing bottle, at least 200 mm tall, with ground glass stopper (A cylindrical container is preferable to a separatory funnel for this experiment. The stopper must be non- reactive, and, to prevent a potentially dangerous pressure build-up, the stopper must be easily released. For a very small class, a large test tube with a suitable stopper is adequate. )
• Equal volumes of chloroform, water, and hexane (The volume of each liquid should be a little more than one-fourth the volume of the cylinder.)
• Iodine crystals and small spatula
• Potassium iodide crystals and medium spatula
Preparation
Work in a hood. Pour the chloroform into the reaction cylinder. Add the water and allow the liquids to separate completely. (If necessary, speed the process by holding the cylinder vertical and gently swirling the solution with a circular motion.) Tip the cylinder and pour the hexane slowly down the side to prevent mixing. Close the cylinder and set it aside, away from sources of heat, until time for the demonstration.
Answer:It forms single phase mixtures (solutions) with other polar and ionic substances. ... Since water is less dense than this non-polar mixture, the bubbles rise to the top. Potassium iodide, an ionic compound, dissolves easily in water but does not dissolve in chloroform and hexane.
Explanation:
Which covalent bond is the most polar?
a) S-O
b) C=0
c) Se-F
d) H-O
e) O=O
How much force is required to accelerate an 8-kg wagon at a rate of 15 m/s
Answer:
120 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 8 × 15
We have the final answer as
120 NHope this helps you
elements have the same number of what when you move from the left of the periodic table to the right?
According to Le Chatelier’s principle, which statement is true?
The equilibrium constant is unchanged by temperature changes.
The equilibrium constant changes with a change in temperature.
The equilibrium constant increases with the concentration of reactants.
The equilibrium constant decreases with the concentration of products.
As per Le Cha-tel-ier’s principle, the true statement should be option b. The equilibrium constant changes with a change in temperature.
What is Le Cha-tel-ier’s principle?It defined that if there is any changes in the temperature, pressure, volume, or concentration of a system so it should be leads into the opposing changes in the system for accomplishing a new equilibrium state.
Hence, we can conclude that As per Le Cha-tel-ier’s principle, the true statement should be option b. The equilibrium constant changes with a change in temperature.
Learn more about equilibrium here: https://brainly.com/question/24207087
Answer:
b
Explanation:
If the producers of the ecosystem below make 14,000 units of energy. How much energy would be available to the very top trophic level?
Answer:
1.4
Explanation took test
(?)Fe+(?)H20 - - -> (?)Fe3O4+(?)H2
Answer:
what is this question??
Please select the word from the list that best fits the definition
Measured in grams of solute per gram of solution
concentration
solubility
Answer:
Solubility
Explanation:
Solubility units that incorporate units of solution include grams of solute per 100 grams of solution or grams of solute per liter of solution. Another way to express solubility is in moles of solute per liter of solution; this ratio is called "molarity."
please help ASAP it is maybe easy for you!!!
Answer:
the answer is C, 30g
what are the things used in soap? are they good or bad to our skin?
Answer: Your skin is your largest organ—22 square feet on average— Cleansers and body washes—might actually be doing us more harm than good, but, unfortunately, it absorbs harmful chemicals we put on it, too.
Explanation: Some are bad like scented body wash and hair stuff. But unscented is WAY better than scented, I learned that the hard way...
What are the classifications of these compounds? Are they triglycerides?
Answer:
Yes they are triglycerides
Explanation:
Triglycerides are esters derived from glycerol and three fatty acids.
If we look at the structures closely, we will notice that the compounds are composed of glycerol and three fatty acids.
Hence the structures are triglycerides. The first structure is an unsaturated triglyceride while the second structure is a saturated triglyceride.
Calculate the percentage composition of a hypothetical compound, X2Y3. The molar mass of X is 4.53 g/mol and the molar mass of Y is 8.71 g/mol. Round both answers to whole numbers.
Answer:
Explanation: Don't let anyone bring you down you got this you matter, and rock!
What kind of bond would form between an iron and an oxygen atom: ionic, covalent, or metallic? What kind of bond would form between two silver atoms: ionic, covalent, or metallic? What happens to the valence electrons in this bond? How do ionization energy and electronegativity help explain why this occurs? 3) What kind of bond would form between two chlorine atoms: ionic, covalent, or metallic? What happens to the valence electrons in this bond? How do ionization energy and electronegativity help explain why this occurs?
Answer:
See explanation
Explanation:
Since iron is a metal and oxygen is a non metal, a bond is formed between the two when electrons are transferred from iron to oxygen. Hence the bond is ionic.
Two silver atoms are held together by metallic bonds. Metallic bond are bond forces that exist between metal atoms in a crystal lattice. The valence electrons in this bond form a cloud. Metals have low ionization energy and low electronegativity hence they loose electrons easily. This accounts for the nature of the metallic bond.
The bond formed between two chlorine atoms is a covalent bond. The valence electrons in this bond are localized between the two chlorine atoms. Chlorine is a nonmetal hence it has a high ionization energy and high electronegativity. Hence it forms covalent bonds in which electrons are shared between bonding atoms.
compound form of lithium and selenium
Answer:
Li2Se
Lithium selenide
Explanation:
The atmospheric gases in the thermoaphere are heated___.
Answer:
Directly by the sun
which of the following is an example of an electromagnetic wave A. an ocean wave B. A sound wave C. A light wave D. A wave traveling along a rope
Answer:
Light waves
Explanation:
It isn't sound because it isn't infrared, involve electromagneticism, or light/radiation. An ocean wave is a literal wave of water, and a wave traveling along a rope is way off course. Choose a light wave. Also, brainliest would be nice. Glad to help
A molecule of __________ consists of two atoms of hydrogen and one atom of oxygen.
The chemical formula for water is __________.
Each hydrogen atom in a water molecule shares __________ valence electron(s) with the oxygen atom.
The chemical formula for carbon dioxide is __________.
The chemical formula CO represents the compound __________.
Atoms or ions in compounds are held together by chemical __________.
Three types of chemical bonds are covalent, ionic, and __________ bonds.
Answer:
WaterH2Oone pairCO2Carbon monoxide bondsmetallicAnswer:
A molecule of Water consists of two atoms of hydrogen and one atom of oxygen.
The chemical formula for water is H2O .
Each hydrogen atom in a water molecule shares one valence electron(s) with the oxygen atom.
The chemical formula for carbon dioxide is CO2 .
The chemical formula CO represents the compound carbon monoxide.
Atoms or ions in compounds are held together by chemical bond.
Three types of chemical bonds are covalent, ionic, and metallic bonds
Which of the following reactants will generate products with a solution of phosphoric acid?
a
Al(s)
b
Cu(s)
c
Au(s)
d
Ag(s)
Answer:
A. Al(s)
Explanation:
the structural formula for CF4 is
Answer:
PubChem CID 6393
Structure
Find Similar Structures
Chemical Safety
Compressed Gas
Laboratory Chemical Safety Summary (LCSS) Datasheet
Molecular Formula CF4
Molecular Weight
88.004 g/mol
Explanation:
The products in this reaction
A have the same properties as the reactants.
В.
have the same atom arrangement as the reactants.
С.
have different properties than the reactants.
D
have fewer atoms than the reactants.
Answer:
It’s either B or C:
В. have the same atom arrangement as the reactants.
С. have different properties than the reactants.
Explanation:
Sorry, I don’t know a lot about this topic :(
SOMEONE PLEASE HELP QUICKLY
determine the number of charged particles in nucleus of calcium atom then deduce the number of electrons
NUCLEAR CHARGE (20+)
ATOMIC MASS (40 amu)
given the relative charge of a proton =1+\ m1nucleon=1amu
Answer:
detail is given below.
Explanation:
The charged particles of nucleus are protons while neutrons are neutral having no charge.
We know that an atom consist of electrons, protons and neutrons. Neutrons and protons are present inside the nucleus while electrons are present out side the nucleus. Electron has a negative charge and is written as e⁻. The mass of electron is 9.10938356×10⁻³¹ Kg . While mass of proton and neutron is 1.672623×10⁻²⁷Kg and 1.674929×10⁻²⁷ Kg respectively.
Symbol of proton= P⁺
Symbol of neutron= n⁰
The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons.
one proton contribute 1 amu to the total weight. There are 20 protons and 20 neutrons in Ca thus its atomic mass is 40 amu.
While the atomic number is 20.
According to Le Chatelier's principle, what happens to the equilibrium constant (K) when the concentration of the reactants is doubled? The value of the equilibrium constant (K) is doubled. The value of the equilibrium constant (K) is halved. The value of the equilibrium constant (K) remains the same. The value of the equilibrium constant (K) changes unpredictably.
Answer:
The value of the equilibrium constant (K) remains the same.
Explanation:
A state of dynamic equilibrium is said to have been achieved in a reaction system when the rate of forward reaction equals the rate of reverse reaction.
At equilibrium, doubling the initial concentration of reactants have no effect on the equilibrium constant K. The equilibrium will rather shift to the left or right as required in order to annul the constraint.
Answer:
C
Explanation:
What is the work done on an object moved a distance of 63 m with a force of 8.5 x 103
Newtons?
Answer:
5.355 × 10³ JoulesExplanation:
I just had this question on my test
Read the clues given below to classify an unknown organism.
Clue 1: A unicellular organism
Clue 2: Lives in the human body
What is the correct classification of the organism?
A. Domain Bacteria; Kingdom Eubacteria
B. Domain Archaea; Kingdom Eubacteria
C. Domain Bacteria; Kingdom Archaebacteria
D. Domain Archaea; Kingdom Archaebacteria
Answer:
c
Explanation:
bacteria can be a single cell and archaebacteria live in the human body
Answer:
c
Explanation:
You are planning on making punch and you would like to cool it with ice. At the store, there are 2 different one-pound bags of ice to choose from: one that contains large ice cubes one that contains small ice chips. You only want to purchase one bag of ice and will add the entire bag to the punch. Would one of the bags cool the punch at a faster rate? If so, which one and why? If not, why? Would one of the bags of ice cool the punch to a lower temperature? If so, which one and why? If not, why? (Not really a chem q, I didn't know what subject to put it in)
Which statement is true about a reaction represented by a chemical equation that shows energy as a reactant?

A.
It absorbs energy.

B.
It releases energy.

C.
It is a replacement reaction.

D.
It is a combustion reaction.
Why reaction between phosphorus and oxygen produces four atoms of phosphorus and five atoms of oxygen
Answer:
Reaction between an oxygen and a phosphorus will produce oxides of phosphorus.
Explanation:
Reaction between oxygen and phosphorus produces four atoms of phosphorus with five atoms of oxygen. Sometimes it produces two atoms of phosphorus and five atoms of oxygen and sometimes four atoms of phosphorus and six atoms of oxygen. It does so depending upon the availability of oxygen. The size of phosphorus atom interferes with the ability to form a double bonds to the other elements, such as nitrogen, oxygen, etc.
Which sentence contains a common allusion?
O A. The meeting became extremely tense.
OB. The meeting turned into Waterloo.
O C. The meeting was held in Chicago.
OD. The meeting proceeded despite obstacles.
Answer:
B
Explanation:
The sentence that is a common allusion is:
B. The meeting turned into Waterloo.
All the other choices are not considered as an allusion
What is an allusion?It is an inferred or roundabout reference to an individual, occasion, or thing or to a piece of another text. Most references rely upon the comprehension that there is a gathering of data that is shared by the essayist and the peruser consequently. the peruser will get the author's referent.
The example of common allusion from the instances given are:
The meeting turned into Waterloo.
Find more information about Allusion here:
brainly.com/question/2427003
0.025 millimeters is the same as how many liters?
Answer:
2.5e-5
Explanation:
Convert 500 mL to L
Answer:
0.5L
Explanation:
1L = 1000 ml
0.5L
Answer: 0.5
Explanation:
Question 5 (2 points)
Which of the following has a higher boiling point, CO2 or Co? Explain.
Answer:
CO2 has higher boiling point as compared to CO
Explanation:
Because CO is linear molecule anf zero dipole moment while CO2 is non linear and it has dipole moment