The acids do not completely dissociate in water. So, they tend to form a buffer system. Above pH 3.5, the concentration of the conjugate base is more than the concentration of the acid.
Weak acids: These are the acids that do not completely dissociate in water. So, they tend to form a buffer system.Buffers are used to resist a slight change in pH. The pH is equal to the pKa of the solution at equivalence.At equivalence, the concentration of weak acid and its conjugate base is equal.After the equivalence point, the concentration of the conjugate base is more than the concentration of the acid.
Therefore, after 3.5 the concentration of the conjugate base is more than the concentration of the acid.
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Plasma is the most common state of matter in the?
Earth's atmosphere
Earth's crust
oceans
universe
Answer:
Universe
Hope its helpful
Thank you
who likes chicken nuggets
Answer:
me especially the dino ones
Explanation:
Mass of the Graduated Cylinder
(only air)(g) Mass of the Graduated Cylinder with
Water (g) Calculated Mass of Water (g)
73.7 73.7 0.0
A student collected the above data for this experiment. What error did he make? Explain.
Answer:
If there is water in the graduated cylinder and what is required is the exact amount of water, then the instrument used to measure the mass is not that accurate. Having only one decimal place is not enough to detect the mass of water in the cylinder.
Explanation:
What volume do 78 grams of magnesium occupy?
Electrons, protons and which other sub-atomic particle were discovered in the 19th and early 20th century?
Answer: The electron, discovered in 1897 by J. J. Thomson, was the first subatomic particle to be observed. The nucleus of ordinary hydrogen was understood to be a single proton after the nucleus of the atom was discovered in 1911 by Ernest Rutherford. In 1932, a neutron was detected.
Which of the following is TRUE of all bases?
Answer:
y
Explanation:
k
I didn't really understand the explanation, can it be broken down
Answer:
40.06
Explanation:
(23 * 39) + (48 * 40) + (29 * 41)
100
= 40.06
formula:
(% of isotope A * mass of A) + (% of isotope B * mass of B) ......
100
Answer:
yes it can be broken down
Consumers _____.
break down dead material into nutrients
eat only meat
eat other organisms for energy
make their own food
Answer:
Consumers are unable to make their own energy, and instead rely on the consumption and digestion of producers or other consumers, or both, to survive.
Decomposer is an organism, especially a soil bacterium, fungus, or invertebrate, that decomposes organic material. They are all living things that get energy by eating dead animals and plants and breaking down wastes of other animals.
Explanation:
Answer:
A
Explanation:
Match the general form of each reaction to it’s appropriate chenille reaction.
In photo
Which element is in the same group as carbon?
look at the attached photo
Answer:
B. Germanium
Explanation:
Since the carbon group element consists of carbon, germanium, etc. Germanium is in the same group as carbon.
How are mixtures and solutions different from each other?
A. there are no differences
B. one combiner chemically the other combines electronically
C. They have more than one element in them
D. the mixture can be separated and the solution is not easily separated
Identify the number of valence electrons in each atom:
a. Calcium
b. Carbon
c. Sulfur
Answer:
-Sulfur is a chemical element with the symbol S and atomic number 16. It is abundant, multivalent and nonmetallic. Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formula S₈. Elemental sulfur is a bright yellow, crystalline solid at room temperature.
(Atomic number: 16
Electron configuration: [Ne] 3s²3p⁴
Electrons per shell: 2,8,6
Electronegativity: 2.58)
-Calcium is the 20th element, with 20 protons. Since a stable atom has a net charge of 0, we must have 20 electrons.
-Carbon is a chemical element with the symbol C and atomic number 6. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. It belongs to group 14 of the periodic table. Carbon makes up only about 0.025 percent of Earth's crust.
(Symbol: C
Atomic mass: 12.0107 u
Atomic number: 6
Electrons per shell: 2, 4
Electron configuration: [He] 2s22p2
Electronegativity: 2.55)
According to the electronic configuration, number of valence electrons in each atom of calcium,carbon and sulfur is 2, 4 and 6 respectively.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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For each of the following ionic bonding examples, show the transfer of electrons, the ions resulting with the charges and the final chemical formula of the compund.
Ba and O,
Al and O,
Mg and P,
Na and O,
Ca and Cl
Answer:
BaO
Ba gives up two electrons and becomes Ba⁺²O takes two electron and becomes O⁻²Al₂O₃
Mg₃P₂
Na₂O
CaCl₂
Copper oxide reacts with carbon to form copper and carbon dioxide. State what has been reduced giving a reason for your answer
Answer:
copper oxide has been reuced into copper
Explanation:
The copper has gained electrons to become stable on its own without oxygen
OILRIG- show that reducution is the gain of electrons
how many moles is 135 L of ammonia gas at STP
Answer:
i
Explanation:
What is the formula for Aluminum iodate?
Answer:
the formula is AlI3
(a) Give the H-C-O bond angle in methyl formate H-C-O bond angle methyl formate
(b) One dihedral angle in methyl formate relates the plane containing the O-C- O bonds to the plane y two structures of methyl formate: one in which this dihedral angle containing the Co-onds, identand the other in which it is 180 0° dihedral angle 80" dihedral angle.
Answer:
Explanation:
The bond angle is said to be the angle between two atoms near or around the same atom for a given covalent compound. However, a dihedral angle is known as the angle formed between two planes. Bond angles are usually planar while dihedral angles are interplanar.
The diagram below shows the structure of each compound.
James has opened the valve on the propane tank for his BBQ grill. He later notices how cold the top of the tank feels. What is the reason for this?
A) The liquid inside is condensing; losing energy to overcome the interactions holding them together
B) The liquid inside is vaporizing; losing energy to overcome the interactions holding them together.
C) The liquid inside is vaporizing; gaining energy to overcome the interactions holding them together.
D) The liquid inside is freezing; gaining energy to overcome the interactions holding them together
Answer: D
Explanation:
D
Which is the best prediction about the cell structures of muscle cells?
A.
Muscle cells have a large volume of cytoplasm so that the cell can easily change shape.
B.
Muscle cells contain a large number of mitochondria in order to provide more energy.
C.
Muscle cells do not have nuclei because they do not need to produce proteins.
D.
Muscle cells are surrounded by cell walls so that they are strong enough to move bones.
Answer:
is B
Explanation:
it isnt C or D so let's look at A and B so the answer is more likely going to be B because A your muscles cant change shape and C your muscles are protien and D humans and animals do not have cell walls that only have cell membrane
Answer:
No B. is incorrect, the REAL answer is actually C.
Explanation:
The main function of muscles is to move body parts by contracting, which requires a lot of energy. so C. is the only answer that concludes with this. The cell structure that produces energy is the mitochondrion.
Therefore, the best prediction is that muscle cells contain a large number of mitochondria in order to provide more energy.
So that means B. would be an assumable answer.
I hope this helps!
what is the physical property to all of these (pls answer I’ll give brainliest)
Ability of an object to break apart or shatter easily.
Either transparent (clear), translucent (cloudy), or opaque (not allowing light through).
eg. red, orange, blue, ...
Amount of mass per unit volume of that matter.
Ability to be stretched into a long wire-like shape.
Definite geometric pattern.
Determined by the resistance to being scratched, given on a scale of 1-10 with a diamond being rated a 10.
Ability of an object to reflect light (eg. shiny).
Ability of a substance to be hammered or bent into different shapes.
The temperature when a solid melts.
eg. burnt, flowery
Ability of a substance (solute) to dissolve in a solvent such as water.
Condition of being a solid, liquid, or gas.
eg. sweet, sour, salty, bitter,.
The "feel" of an object (eg. silky, waxy, gritty,...)
The resistance of a liquid to flowing.
Answer:
Explanation:
Brittleness : The ability of an object to break apart or shatter easily
Ductility: The ability of a substance to be stretched out into a long wire-like shape.
Lustre: the ability of an object to reflect light.
Malleability is a substance's ability to deform under pressure
The melting point of ice is 0°C. The melting point of a solid is the same as the freezing point of the liquid
Solubility is the relative ability of a solute to dissolve into a solvent.
solid: Has a definite shape and volume.
liquid: Has a definite volume, but take the shape of the container.
gas: Has no definite shape or volume. change of state
The resistance of a liquid to flowing is its viscosity.
Let me Know if i missed somethin!!! :) Hope this Helped!!!
Answer:
1.Brittleness
2.Clarity
3.Color
4.How dense it is
5.Ductility
6.Crystalline
7.Hardness
8.Reflectivity
9.Malleability
10.Melting Point
11.Smell
12.Solubility
13.State of Matter
14.Taste
15.Texture
16.Viscosity
24. In our experiment, we filled 4 tubes with water and bromothymol blue.
Tube 1 did not contain an organisms, tube 2 contained a snail, tube 3
contained a elodea and tube 4 contained both a snail and elodea. What
tubes could photosynthesis occur in?
O Tubes 3 and 4
O Tubes 2 and 4
O Tubes 2, 3, and 4
Answer:
C. Tubes 2, 3, and 4
Explanation:
Tube one doesn't contain an organism so it can't be that one.
Both a snail and an elodea are considered an organism, cellular respiration occurs in almost any organism's cells.
good luck, i hope this helps :)
Given the following equation: 2C6H6 + 1502 - 12CO2 + 6H20
How many moles of O2 are needed to react with 4.0 moles of
Co HG?
a 30 moles
b 12 moles
C 4.0 moles
d 24 moles
Answer:
a) 30 moles
Explanation:
2C6H6 + 1502 -------> 12CO2 + 6H20
from reaction 2 mol 15 mol
given 4.0 mol x mol
x = 4.0*15/2 = 30. mol
how do we know that a chemical reaction occured
Answer: signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.
Explanation:
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what is the mass of 0.75 mol of hydrogen sulfide
Answer:
25.56066
Explanation:
hope this helps !!!!!!! and sorry if it doesn't help
A solution of sodium hydroxide was added to a solution of sulfuric acid. How many moles of sodium hydroxide would react with 1 mole of sulfuric acid?
Answer:
Please mark Brainliest
2 moles
Explanation:
Hope it helped :)
Answer: It is 2 moles
Select the correct answer.
Which element is more reactive than rubidium (Rb)?
A.
aluminum (Al)
B.
cesium (Cs)
C.
strontium (Sr)
D.
beryllium (Be)
Answer:
B.cesium (Cs)
Explanation:
Reactivity for metals is that it increases as you go down and decreases as you go right.
Answer:strontium (Sr)
Explanation:
Question 3 of 10
How does air pressure affect the boiling point of a liquid?
A. Air pressure lowers the temperature of the liquid molecules.
B. Air pressure keeps liquid molecules from escaping as a gas.
c. Air pressure decreases the kinetic energy of the liquid molecules.
D. Air pressure prevents diffusion from happening in a gas.
SUBMIT
Air pressure keeps liquid molecules from escaping as a gas, affect the boiling point of a liquid. Therefore, option B is correct.
Why does the boiling point decrease as air pressure decreases?A liquid's boiling point changes depending on the pressure being applied; the normal boiling point is the temperature at which the vapour pressure is equal to the average atmospheric pressure at sea level (760 mm [29.92 inches] of mercury). Water boils at sea level at 100° C (212° F).
The boiling point of a liquid is influenced by the pressure of gas above it. This is referred to as atmospheric pressure in an open system. The higher the boiling point and the more energy is needed to bring liquids to a boil, the higher the pressure.
Thus, option B is correct.
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You have the compound CH4. The first element is a
(metal, nonmetal) and the second element is a
(metal, nonmetal). You would predict that this would form a(n).
(ionic, covalent) bond.
ASAP
Answer:
1. Nonmetal
2. Nonmetal
3. Covalent
Explanation:
CH4 is the chemical formula for the methane molecule in which four atoms of hydrogen is chemically bonded to one atom of carbon. Both carbon, which is the first element and hydrogen the second element are non-metals, and hence can only form a covalent bond.
A covalent bond is a type of chemical bond in which two atoms share their valence electrons. It occurs between two non metallic atoms. In this molecule, CH4, carbon and hydrogen share their valence electrons to form a covalent bond.
A property is a characteristic that can be used to identify a substance. Properties can be ______ or _______.
Answer:
a list of characteristics that can be used to identify a substance include color, odor, taste, density, melting point, boiling point, conductivity, and hardness.
Answer:
physical or chemical
Explanation:
A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance while a chemical property describes the ability of a substance to undergo a specific chemical change.
Rusting of nail are chemical change or physical change and say why
Answer:
Explanation:
‘it’s a chemical change because this may seem like a decomposition reaction because it seems like the nail is decomposing and falling apart.
Answer:
the rusting of iron is a chemical change because it is two substance reacting together to make a new substance.
Explanation:
