Answer:
Noble gases already have a completed Octet structure hence they are stable.
Explanation:
One basic reason for chemical reaction is that individual atoms seek to attain the stable Octet, that means, to have eight electrons on their outermost shell.
The noble gases are stable since they have already achieved this stable octet structure.
Having already filled electron shells, noble gases hardly participate in chemical bonding but often exist in the gas phase as isolated atoms.
The noble gases have been present as an individual atom due to the complete outer valence shell.
In an atom, the presence of valence electrons has been the representation of the reactivity of the atom.
The atoms tend to complete the outermost octet and become stable. In order to be stabilized, the elements form chemical bonds with the same element and have been present in the diatomic form.
However, with noble gases such as Neon, Helium the outer valence shell has been complete, they have been present as individual atoms with less reactivity.
For more information about the chemical bonds, refer to the link:
https://brainly.com/question/6071754
The unknown ionic compound gave a green flame test, precipitate with ammonium carbonate, and a colorless/light yellow halide test. What is the unknown compound?
Answer:
BaI2
Explanation:
Barium gives a green flame test. When the halide test is conducted, a yellow precipitate indicates the presence of the iodide ion.
Also, BaI2 reacts with ammonium carbonate as shown below:
BaI2(aq) + (NH4)2CO3(aq) → BaCO3(s) + 2(NH4)I(aq)
The BaCO3(s) separates from the reaction system as a precipitate.
This is timed i need this fast
Answer:
1. or A
Explanation:
How do you find distance please help very fast.
Magnesium can interfere with the measurement of the calcium concentration in water samples using colorimetric tests. Write a balanced chemical equation for the reaction of dissolved magnesium chloride with sodium hydroxide to form magnesium hydroxide as a precipitate and sodium chloride.
(Reactants -> Products)
Answer:
[tex]MgCl_2+2NaOH\rightarrow 2NaCl+Mg(OH)_2[/tex]
Explanation:
Hello.
In this case, since aqueous magnesium chloride reacts with aqueous sodium hydroxide, a precipitate product, magnesium hydroxide is formed as well as aqueous sodium chloride as shown below:
[tex]MgCl_2+NaOH\rightarrow NaCl+Mg(OH)_2[/tex]
However, since there are two chlorine atoms at the reactants we need a 2 before NaCl on the products in order to balance it. Moreover, there one OH at the reactants and two OH at the products, that is why we also add a 2 before NaCl as shown below:
[tex]MgCl_2+2NaOH\rightarrow 2NaCl+Mg(OH)_2[/tex]
Best regards!
How is Earth's surface most likely to change in a cold place that experiences rainfall?
A- Soil will loosen due to extensive network of tunnels.
B- Rock will break due to repeated abrasion and stress.
C- Mounds of sand will form due to deposition of sediments.
D- Cracks will appear in rocks due to freezing and thawing.
HURRRYYY!!!
Answer:
I think the answer would have to be D
Answer:
I believe it is C
Explanation:
If I am wrong give me 1 star
Why is ice less dense than water?
Answer:
Ice has a very different structure than liquid water
Explanation:
the lattice arrangement allows water molecules to be more spread out than in a liquid, and, thus, ice is less dense than water.
Answer:
Ice has a different structure than water, they align themselves in a regular lattice rather than completely random in a liquid. The orientation of hydrogen bonds cause molecules to push farther apart, which lowers the density.
Increasing the concentration of substances in a chemical reaction will _____.
Answer:
it will increase the rate of reaction
Answer:
Option (a) is the correct answer.
Explanation:
When we increase the concentration of substances in a chemical reaction then it means there are more number of molecules present in a reaction.
Hence, when these molecules will interact with each other then there will occur more number of collisions. As a result, kinetic energy of molecules will increase and this leads to increase in rate of chemical reaction.
Thus, we can conclude that increasing the concentration of substances in a chemical reaction will increase reaction rate.
Hope this helps!
Have a great day! :))))
Calculate the hydronium ion, H3O+ , and hydroxide ion, OH− , concentrations for a 0.0440 M HCl solution. [H3O+]= M [OH−]=
Answer:
[H3O+] = 0.0440M
[OH-] = 2.27x10⁻¹³M
Explanation:
Based on the equilibrium of water:
2H2O ⇄ H3O+ + OH-
K = 1x10⁻¹⁴ = [H3O+] [OH-] (1)
We can determine [OH-] with [H3O+] or vice versa
As HCl is a strong acid, [HCl] = [H3O+]
That means:
[H3O+] = 0.0440M
And [OH-] is:
1x10⁻¹⁴ / [H3O+] = [OH-]
2.27x10⁻¹³M = [OH-]
Taking into account the definition of pH and pOH, the hydronium ion, H₃O⁺, and hydroxide ion, OH−, are 0.044 M and 2.29×10⁻¹³ M respectively.
First of all, pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:
pH= - log [H⁺]= - log [H₃O⁺]
Similarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:
pOH= - log [OH⁻]
The following relationship can be established between pH and pOH:
pOH + pH= 14
In this case, you have a 0.044 M HCl. HCl is a strong acid.
It is called strong acid, that acid that dissociates completely in solution at constant temperature and pressure. Under these conditions, the concentration of a strong acid is equal to the concentration of hydrogen ions (Hydronium or H₃O⁺). Then, in this case:
[H⁺]= [H₃O⁺]= [HCl]= 0.044 M
Replacing in the definition of pH:
pH= -log (0.044 M)
Solving:
pH= 1.36
Considering the relationship established between pH and pOH:
pOH + 1.36= 14
pOH= 14 -1.36
pOH= 12.64
Finally, replacing in the definition of pOH:
12.64= -log [OH-]
[OH-]= 10⁻¹² ⁶⁴
[OH-]= 2.29×10⁻¹³ M
In summary, the hydronium ion, H₃O⁺, and hydroxide ion, OH−, are 0.044 M and 2.29×10⁻¹³ M respectively.
Learn more:
brainly.com/question/12200689 brainly.com/question/16032912?referrer=searchResults brainly.com/question/13557815?referrer=searchResultsYou are assigned the task of separating a desired granular material, with a density of 3.26 g/cm3, from an undesired granular material that has a density of 2.04 g/cm3. You want to do this by shaking the mixture in a liquid. A solid will float on any liquid that is more dense. Using an Internet-based source, find the densities of the following substances: carbon tetrachl oride, hexane, benzene, and diiodomethane. Which of these liquids will serve your purpose, assuming no chemical interaction between the liquid and the solids?
Answer:
diiodomethane
Explanation:
The densities of each of the liquids mentioned in the question are stated below;
CCl4- 1.59 g/cm^3
Hexane- 0.672 g/cm^3
Benzene- 0.8765 g/cm^3
Diiodomethane- 3.3 g/cm^3
Clearly, the density of diiodomethane methane is almost the same as that of the desired granular material, hence the undesired granular material having a density of 2.04 g/cm3 will float in diiodomethane thus separating the two granular materials.
When a base metal is converted into gold - this phenomenon is best described as what?
Answer:
Alchemy
Explanation:
Alchemy is the believe that base metals such as a copper, lead etc can be transmuted into gold.
The alchemists were in search of a magical piece that would enable them to make gold from base metals. They called this magical stuff 'the Philosopher's Stone'.
Modern science has discovered that lead can be turned into gold,without applying the methods of alchemy. Nuclear transmutation in particle accelerators can indeed change one element into another.
Which of the following phrases describe the function of the digestive system? Select the two best answers.
I. Smooth, muscular tube connects the mouth to the stomach
II. Muscular action in the esophagus pushes food to the stomach
III. Structures called microvilli increase the surface area of the intestines
IV. Nutrients are made available to the body’s cells
Answer:
Options I & II
I. Smooth, muscular tube connects the mouth to the stomach
II. Muscular action in the esophagus pushes food to the stomach
Explanation:
In digestive systems, we have what we call esophagus. The process is that;
The esophagus we have is a tubular like organ which connects the mouth to the stomach. Now, when we chew food and it's soft, the food will pass through the esophagus after we have swallowed it.
The smooth muscles of the esophagus will now undergo peristalsis which is a series of wave like movements that will push the food toward the stomach.
Thus, we have seen that the esophagus is a smooth tube and that muscle action on it enables the food to be pushed down the stomach.
Thus, options I & II are correct.
From the statements below identify all the chemical changes
Answer:
um... there are no statements below
Explanation:
I can't really help without any statements.
1. Warm air puts more pressure on Earth than cooler air does.
True
False
Answer:
false I think, but not so sure
What is the name of the unit in the measurement 0.8 L
Answer:
hiiiiiiiiiiiiiiiiiiiiiiiiiiii
Answer:
The name of this unit in the measurement is called: Liter
fabric it is useful or harmful
Answer:
useful of course because u wont be able to pick up any thing
Fabric can be both useful and harmful.
Fabric can be useful for...
Making clothing.Made into rags.And many more ways.Fabric can be harmful in these ways...
Small pieces can be choked on by toddlers.It can get wrapped around your neck.And many wore ways.Hope i helped!
May I have brainliest?
[tex]\huge\boxed{Thanks,\;Plip.}[/tex]
Why does hard water taste better than distilled water?
Answer:
because hard water is salty
What is the answer A,B,C,D?
Answer:
Explanation:
I think that it is frequency
Answer:
B
Explanation:
The Length is 4 feet, the width it’s 6 feet and the height is 9 feet. what is the volume
Answer:
216 square feet is the volume
The liquid-phase reaction follows an elementary rate law and is carried out isothermally in a flow system. The concentrations of the A and B feed streams are 2 M before mixing. The volumetric flow rate of each stream is 5 dm3/min, and the entering temperature is 300 K. The streams are mixed immediately before entering. Two reactors are available. One is a gray, 200.0-dm^3 CSTR that can be heated to 77C or cooled to 0C, and the other is a white, 800.0-dm^3 PFR operated at 300 K that cannot be heated or cooled but can be painted red or black. Note that k = 0.07 dm^3 /mol/min at 300K and E =20 kcal/mol.
Required:
a. Which reactor and what conditions do you recommend? Explain the reason for your choice.
b. How long would it take to achieve 90% conversion in a 200-dm^3 batch reactor with after mixing at a temperature of 77C?
c. What would your answer to part (b) be if the reactor were cooled to 0C?
e kajajdjae no squo viboes we eso doadks Answer:ipao han meExplanation:no
What are the alkali metals?
A. Elements with eight valence electrons
B. Group 18 on the periodic table
C. The second group on the periodic table
D. The first group on the periodic table
Answer:
The answer would be D they are the first group on the periodic table.
Explanation:
why are phase changes horizontal on a heating curve
Answer:
A heating curve graphically represents the phase transitions that a substance undergoes as heat is added to it. The plateaus on the curve mark the phase changes.The second change of phase is boiling, as the temperature stays the same during the transition to gas.
Explanation:
The grassland have experience a long season of drought which group of organisms would be affected first A decomposer B herbivores C omnivorous D carnivores
Answer:
Herbivores?
Explanation:
The answer is Herbivores because plants are their main source of food and diet. They would be affected first throughout the drought.
(I hope this is a good answer, it is my first time answering a question. I will change this if it is wrong!)
What would you expect to happen if Earth did not tilt on its axis?
Answer:
If the earth did not tilt on its axis we would not have 4 seasons, and it would be hooall the time since when we rotate around the sun the earth with become Hot all the way around.
Explanation:
William Astbury discovered that the X‑ray diffraction pattern of wool shows a repeating structural unit of approximately 5.2 Å along the length of the wool fiber. Choose the statement that explains the observed 5.2 Å length of the repeating structural unit in the wool polypeptide, α‑keratin.
a. The wool polypeptide α‑keratin exists primarily as a B‑form double helix, where the length of each complete turn of the helix is 5.2 Å.
b. The wool polypeptide α‑keratin consists primarily of α‑helices arranged as coiled coils, where the length of each complete turn of the helix is 5.2 Å.
c. The wool polypeptide α‑keratin has a fully extended backbone and does not contain any regular secondary structure elements.
d. The wool polypeptide α‑keratin consists of left‑handed helices arranged in a triple‑helix coiled coil. In left‑handed helices, the length each complete turn of the helix is 5.2 Å.
Answer:
A
Explanation:
That answer is the only one that makes sense, because according to the law of pulindu, najah is polypeptide akeratin primarly b orm as
Explain in a paragraph how do you know or can find the number of each subatomic particle using the information on the periodic table. include why the atomic mass of your element on the periodic table is not a whole number or why it is. (PLEASE ANSWER FOR BRAINLEST ANSWER)
Answer:
A typical atom consists of three subatomic particles: protons, neutrons, and electrons (as seen in the helium atom below). Other particles exist as well, such as alpha and beta particles (which are discussed below). The Bohr model shows the three basic subatomic particles in a simple manner. Most of an atom's mass is in the nucleus—a small, dense area at the center of every atom, composed of nucleons. Nucleons include protons and neutrons. All the positive charge of an atom is contained in the nucleus, and originates from the protons. Neutrons are neutrally-charged. Electrons, which are negatively-charged, are located outside of the nucleus.
Explanation:
Predict how the milk digestion is affected in individuals that lack functional copies of the gene encoding lactase. Justify your response.
Answer:
Such individuals will be unable to digest milk.
Explanation:
Milk is a substance that contains a disaccharide sugar called LACTOSE. Lactose is a disaccharide sugar composed of glucose and galactose monomers. In order to digest the lactose sugar present in milk, an enzyme called LACTASE is needed.
Since lactase, like every other enzyme, is a protein, it is coded for by a functional gene. However, in an individual that lack functional copies of the gene encoding this lactase enzyme (protein), such individual will be unable to synthesize lactase, hence, be unable to breakdown (digest) lactose sugar in milk.
No lactase gene -> No lactase protein -> No enzyme -> No milk digestion
Which is an example of a chemical change?
Water evaporating from a puddle
Cloth tearing when pulled
Wood formed sawdust when cut
Bread baking in an oven
Answer:
Its bread My guy. Maholo my dudes.
Explanation:
A liquid is found to have a volume of 50ml in a graduated cylinder. When placed on a balance, the liquid and graduated cylinder has a mass of 125 g. The empty graduated cylinder has a mass of 75g. What is the density of the liquid?
Answer:
1 g/mL
Explanation:
Density is mass divided by volume ( g/mL)
Find the mass of the water by subtracting 125g - 75g = 50g.
Then divide the mass of the water by the volume of the water: 50g/50mL = 1g/mL
What does the prefix centi mean?
Answer: one hundredth
Explanation:
What would be the concentration of a solution that has 10. g of NaCl and
90. g of water?
Answer:
10%
Explanation:
I think you are looking for mass percent concentration so...
concentration = (mass of solute / total mass of solution) x 100
concentration = (10g of NaCl / (10g of NaCl + 90g of H2O) solution) x 100
concentration = 0.1 x 100
concentration = 10%
Answer:
Concentration of solution is 0.1.
Explanation:
Given data:
Mass of NaCl = 10 g
Mass of water = 90 g
Concentration of solution = ?
Solution:
Formula:
Concentration = mass of solute / total mass of solution
Now we will calculate the total mass of solution:
Total mass of solution = mass of solute + mass of solvent
Total mass of solute = 10 g + 90 g
Total mass of solute = 100 g
Now we will determine the concentration,
C = 10 g/100 g
C = 0.1