Chemical properties of water for class 8
Answer:
pH value is 7neither acidic nor basecan be found in all 3 state (ie. liquid, solid and gas {vapour})it's excellent solventExplain what is wrong with this electron dot diagram for the element nitrogen
2.8 dm3 of gas X at STP has equal mass with 11.2 dm3 of C2H6 at STP. What is
the number of mole if gas X has 30 grams?
Answer: o.125 moles of gas X with a molar mass of 240
Explanation:
2.8 dm3 of gas X at STP has equal mass with 11.2 dm3 of C2H6 at STP. What is the number of mole if gas X has 30 grams?
the molar volume of any gas at STP is the volume of 1 mole at STP
and is 22.4 L
the C2H6 has a volume of 11.2L at STP so it has 0.5 moles
C2H6 has a molar mass of (2 X 12) +(6 X 1) = 24 + 6 = 30
0,5 moles weighs 15 gm at STP with
so 15 gm at STP with 2.8 L for gas X
PV=nRT
P=1 atm
T =273.2k
V =2.8
R =0.082
n = PV/RT = (1 X 2.8)/(0.082 X 273.2) =0.125 moles of gasX
the weight of gas X is 30 gms
so 30/.125 =240 g/mole = molar mass of gas X
Question 4 of 5
Which characteristic describes the living things in the domain Eukarya?
A. They can be made up of prokaryotic cells.
B. They are made up of eukaryotic cells.
C. They are all multicellular organisms.
D. They are made up of cells that lack a nucleus.
SUBMIT
Answer:
he presence of nucleus which contains genetic material and is enclosed by a nuclear membrane sets them apart from prokaryotic cells. All complex organisms are eukaryotic and they reproduce by mitosis or meiosis. Eukaryotic cells are typically much larger than those of prokaryotes.
Explanation:
What is a quick way to determine how many energy levels an element possesses?
A.
Divide the element's atomic number by eight.
B.
Find the element's group number on the periodic table.
C.
Find the element's period number on the periodic table.
D.
Divide the element's atomic mass by eight.
Answer:
c
Explanation:
just got this question
how long does vacuum sealed raw meat last in the freezer?
Answer:
Frozen Meats – Frozen raw meats that are properly vacuum sealed can be stored in the freezer from 1-3 years depending on the type of meat. However, raw meat that is not vacuum sealed will only last 1-12 months depending on the meat.
Explanation:
hop this helps
Answer: Six months or three years
Explanation: Frozen meats, poultry, and fish can last in the freezer for up to six months and when they are vacuum sealed, frozen meats can stay fresh and free from freezer burn for up to 3 years.
why the mixture of bromine and ethane is discoloured when left in the sun
Answer:
In the presence of UV light, ethane will react with bromine in a substitution reaction. UV light is the condition under which the reaction will occur so it is written above the arrow in the chemical equation. As the reaction proceeds, the intensity of the re-brown colour of the bromine water decreases.
Answer:
here ya go
Explanation:
combining bromine and ethane leads to a brown gas or liquid which is made of the elements. it is a gas at room temperature and does not affect human beings. there are many uses for bromine compounds but they are mainly used for the manufacturing of chlorine, fire retadants, water purification, graphy chemicals and pharmaceutcals. it is a naturally occurring element that can be found in animals such as sharks since they produce their own.
Choose all the answers that apply. According to Newton's second law of motion: objects at rest will remain at rest unless acted upon by an outside force the greater the magnitude of force, the faster the acceleration mass has an inverse relationship with acceleration every action has an equal and opposite reaction acceleration is caused by unbalanced forces
Answer: The answers aplicable would be
1) The greater magnitude of force, the faster the acceleration.
2) Acceleration is caused by unbalanced forces.
Unlike solids and liquids, gases can be compressed. How is this physical characteristic of gases beneficial to society?
Which statement accurately compares these flashlights?
A. The smaller flashlight has more inertia than the larger flashlight,
so it takes less force to change the motion of the smaller
flashlight
B. The smaller flashlight has less inertia than the larger flashlight, so
it takes more force to change the motion of the smaller flashlight.
C. The smaller flashlight has less inertia than the larger flashlight, so
it takes less force to change the motion of the smaller flashlight.
D. The smaller flashlight has more inertia than the larger flashlight,
so it takes more force to change the motion of the smaller
flashlight
The small flashlight has less inertia and smaller force is required to move it.
According to Newton's first law of motion, an object will continue at rest or in its state of uniform motion unless it is acted upon by an external unbalanced force. This is also called the law of inertia.
The quantity of mass contained in a body is a measure of its inertia. The greater the mass of the body, the greater the inertia and the greater the force required to move the body.
The smaller flashlight has less inertia than the larger flashlight, so it takes less force to change the motion of the smaller flashlight.
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explain why boiling is a reversible change
Answer:
This is a reversible change. Similarly, if you boil water, it evaporates and becomes water vapor. When you cool this vapor down, it turns back to water. A change which cannot happen backward, that is, it cannot be reversed is called an irreversible change.
Explanation:
When we boil water by heating, then it changes into steam. Now, if we cool the steam, then water is formed again. So, the changing of water into steam has been reversed by cooling. Thus, the boiling of water (or evaporation of water) is a reversible change.
methane is called an organic compound why
Answer:
Explanation:
1) Organic compounds always contain only p-block elements (Groups III-VII), at least one of which must be carbon. 2) Organic compounds almost always contain one or more C-H bonds. ... Thus, all bonds are typically covalent in organic compounds. Methane (CH4) is the prototypical organic molecule.
Methane contains carbon, forming covalent bonds, and is found in living organisms, making it an organic compound.
Methane (CH₄) is considered an organic compound due to its molecular structure and occurrence in living organisms. Organic compounds are primarily composed of carbon atoms covalently bonded to hydrogen and often other elements like oxygen, nitrogen, sulfur, and more.
Methane consists of one carbon atom bonded to four hydrogen atoms through covalent bonds. Carbon's unique ability to form stable covalent bonds with other elements, including itself, leads to the vast diversity of organic molecules found in living organisms.
Methane is a crucial component of natural gas and is produced by various biological and geological processes. It is present in the digestive systems of animals, formed during decomposition, and plays a role in carbon and energy cycles.
Its prevalence in living systems and its molecular structure classify methane as an organic compound, reflecting the foundational principles of organic chemistry.
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The complete question is :
Methane is called an organic compound why?
Which image represents a homogeneous mixture?
Which image represents a heterogeneous mixture?
Imagine A represents a heterogeneous mixture as it is a mixture composition that does not remain the same throughout the mixture whereas Imagine B represents a homogeneous mixture as it does not have any change or irregularity.
What are Homogenous and Heterogenous mixtures?A homogeneous mixture is defined as having a fairly uniform form and composition, so many homogeneous mixtures are referred to as solutions whereas heterogeneous mixtures are defined as separate substances or phases. The three states or states of matter are gas, liquid and solid.
Some examples of mixtures that include mixtures of sand and water, mixtures of sugar and salt, and mixtures of lime juice and water.
In homogenous solution, particles are distributed uniformly and have uniform composition while in heterogenous solution, particles are distributed non-uniformly and have non-uniform composition
Thus, Imagine A represents a heterogeneous mixture as it is a mixture composition that does not remain the same throughout the mixture whereas Imagine B represents a homogeneous mixture as it does not have any change or irregularity.
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What is an empirical formula
Answer:
a formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.
Explanation:
Answer:
Meaning of Empirical formula :- A formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.Defination of Empirical formula :- The empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound. A simple example of this concept is that the empirical formula of sulfur monoxide, or SO, would simply be SO, as is the empirical formula of disulfur dioxide, S₂O₂.Explanation:
Hope this helps you XD ✌️Carry on learning !!what is an environmental result from burning fossil fuels?
Answer:
Burning fossil fuels emits a number of air pollutants that are harmful to both the environment and public health. Sulfur dioxide (SO2) emissions ...
Help will give brainlyness
Use your periodic table, notes on transition metals, and polyatomic ion table to correctly answer the following:
What is the ionic compound formed from calcium and sulfide ions?
Select one:
O a.
Cas
O b. Ca s
O c. CaSO4
O d. CazS2
Answer:
The high melting point is also consistent with its description as an ionic solid. In the crystal, each S2− ion is surrounded by an octahedron of six Ca2+ ions, and complementarity, each Ca2+ ion surrounded by six S2− ions.
Explanation:
You can use the periodic table to predict whether an atom will form an anion or a cation, and you can often predict the charge of the resulting ion. Atoms of many main-group metals lose enough electrons to leave them with the same number of electrons as an atom of the preceding noble gas. To illustrate, an atom of an alkali metal (group 1) loses one electron and forms a cation with a 1+ charge; an alkaline earth metal (group 2) loses two electrons and forms a cation with a 2+ charge, and so on. For example, a neutral calcium atom, with 20 protons and 20 electrons, readily loses two electrons. This results in a cation with 20 protons, 18 electrons, and a 2+ charge. It has the same number of electrons as atoms of the preceding noble gas, argon, and is symbolized Ca2+. The name of a metal ion is the same as the name of the metal atom from which it forms, so Ca2+ is called a calcium ion.
When atoms of nonmetal elements form ions, they generally gain enough electrons to give them the same number of electrons as an atom of the next noble gas in the periodic table. Atoms of group 17 gain one electron and form anions with a 1− charge; atoms of group 16 gain two electrons and form ions with a 2− charge, and so on. For example, the neutral bromine atom, with 35 protons and 35 electrons, can gain one electron to provide it with 36 electrons. This results in an anion with 35 protons, 36 electrons, and a 1− charge. It has the same number of electrons as atoms of the next noble gas, krypton, and is symbolized Br−. (A discussion of the theory supporting the favored status of noble gas electron numbers reflected in these predictive rules for ion formation is provided in a later chapter of this text.)
Draw the structure of the product that is formed when the compound shown below undergoes a reaction with 1 equivalent of ch3mgi and then is treated with water.
When the compound shown is treated CH3MgI followed by water, 1,3 - cyclohexadienol is formed.
Grignard reagent is an alkylmagnesium halide. Grignard reagents are important synthetic tools in chemistry. They are used to synthesize and number of compounds in the laboratory.
When the Grignard reagent, CH3MgI is reacted with compound shown followed by treatment with water, the product of the reaction is 1,3 - cyclohexadienol whose structure is shown in the second image attached to this answer.
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The table below gives the atomic mass and relative abundance values for the three isotopes of element M.
Relative abundance (%) Atomic mass (amu)
78.99 23.9850
10.00 24.9858
11.01 25.9826
What is the average atomic mass (in amu) of element M?
2.86
5.36
24.30
24.98
Answer:
24.30
Explanation:
Multiply the relative abundance by the atomic mass of each isotope, add the results together, and divide by 100. Then round to the correct amount of significant figures.
(78.99 x 23.9850) + (10.00 x 24.9858) + (11.01 x 25.9826)/100
24.30 is the average atomic mass (in amu) of element M.
What is an atomic mass?Atomic mass is the quantity of matter contained in an atom of an element.
Multiply the relative abundance by the atomic mass of each isotope, add the results together, and divide by 100. Then round to the correct amount of significant figures.
(78.99 x 23.9850) + (10.00 x 24.9858) + (11.01 x 25.9826)
2430.501576 ÷ 100
24.30
Hence, 24.30 is the average atomic mass (in amu) of element M.
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Are all the wax rings melting at the same time?
Answer:yes
Explanation:
this is because the distance doesnt matter
why do alkaline Solutions feel slippery when damp Between Two Fingers
Answer:
because they are saturated
Which statement describes the hydrogen and oxygen atoms in water?
The lone pair of electrons in each hydrogen atom causes the molecule to be bent; the oxygen atom has a partial positive charge, while the hydrogen atoms have partial negative charges.
The lone pairs of electrons in the oxygen atom causes the molecule to be bent; the oxygen atom has a partial positive charge, while the hydrogen atoms have partial negative charges.
The lone pairs of electrons in the oxygen atom causes the molecule to be bent; the oxygen atom has a partial negative charge, while the hydrogen atoms have partial positive charges.
The lone pairs of electrons in the oxygen atom causes the molecule to be bent; the oxygen atom has a partial negative charge, while the hydrogen atoms have partial positive charges.
Answer:
1. Q: How does a phase change from solid to liquid occur in a substance?
A. Heat energy is added to the substance, weakening the electrical attraction between molecules.
2. Q: How do weak intermolecular bond strengths affect the melting and boiling point of a substance?
A: Both the melting point and boiling point are lower.
3. Q: Which term or phrase represents a separation of charges in a molecule, resulting in partial positive and partial negative charges?
A: Dipole
4. Q: Which statement explains why water and ethanol have different boiling points?
A: Water and ethanol have different molecular structures
5. Q: Which statement describes the hydrogen and oxygen atoms in water?
A: The lone pairs of electrons in the oxygen atom causes the molecule to be bent; the oxygen atom has a partial negative charge, while the hydrogen atoms have partial positive charges.
Explanation:
Did it
The statement which best describes the hydrogen and oxygen atoms in
water is that the lone pairs of electrons in the oxygen atom causes the
molecule to be bent; the oxygen atom has a partial negative charge, while
the hydrogen atoms have partial positive charges.
Water is a compound which comprises of the elements hydrogen and
oxygen. They share electrons in the covalent bond present between the
atoms. The sharing of electrons isn't equal which is why it has a bent
structure.
The oxygen atom has a partial negative charge, while the hydrogen atoms
have partial positive charges present in the compound.
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Help please, take a screenshot who will answer will be brainiest.
Answer:
1. Metals are typically shiny, and good at conducting electricity and heat and have a high melting point. Non-metals are typically dull, and poor at conducting electricity and heat and have a low melting point.
2. Element C and element E.
3. a. It is a poor conductor of electricity
b. It is a good conductor of heat
Explanation:
As it says in the chart at the top of the picture, metals are typically good at conducting electricity and heat and have a high melting point. Non-metals are typically poor at conducting electricity and heat and have a low melting point.
The graph below shows the solute concentration inside a paramecium over time. What is happening at the time indicated by the pointer?
Water is moving rapidly into the paramecium by osmosis.
Water is moving rapidly out of the paramecium as the contractile vacuole contracts.
The paramecium is having a meal.
Solutes from the surrounding water are diffusing through the cell membrane, causing the solute concentration inside the paramecium to rise.
The pointer indicated the point at which water is moving rapidly out of the paramecium as the contractile vacuole contracts.
The pointer specifically indicates where the water solute concentration dropped. In order for the solute concentration of the water to drop, more water would have to be added.This means that water from the paramecium moves into the surrounding water as the contractile vacuole contracts. Consequently, the solute concentration of the surrounding solution decreases. When water moves from the solution into the paramecium, the solute concentration increases and this forms a continuous cycle in the graph.More on water movement by osmosis can be found here: https://brainly.com/question/21395644?referrer=searchResults
- A beam of electrons has.....
(A) Wave properties.
(B) Particle properties.
(C) Both of these
(D) Neither of these
Answer:
(C) Both of these
Explanation:
A beam of electrons has both of these Wave properties and Particle properties.
How many molecules are in 25.3g of C2H4O
Answer:
0.57 molecules
Explanation:
What type of molecule is pentanal?
A. Aldehyde
O B. Ketone
O C. Alcohol
O D. Ester
Answer:
[tex] \huge \color{indigo} \boxed{a. \: aldehyde}[/tex]
Explanation:
Pentanal is considered to be a fatty aldehyde lipid molecule. These are compounds containing more than one aldehyde group. Pentanal is a very hydrophobic molecule, practically insoluble in water, and relatively neutral.
Which was the first ""cell"" viewed by the light microscope?microbeatomdnaoak bark.
Answer:
The cork cell
Explanation:
Arrange the events for the hydrolysis of amide bonds by chymotrypsin in their correct order.
1. attack by Ser 195 to give a tetrahedral intermediate
2. protonation by His 57 and release of the free C-terminus of the hydrolyzed bond
3. protonation by His 57 and release of the free N-terminus of the hydrolyzed bond
4. attack by water, leading to formation of a tetrahedral intermediate
5. binding of substrate to properly position the scissile bond for cleavage
a. 5, 1, 3, 4, 2
b. 5,1,2,4,3 5,
c. 1, 3, 2,4 5,
d. 2, 4, 3, 1
Answer:
The answer is A
Explanation:
the order 5,1,3,4,2
Help with Complex Ions!
Determine the [Ag+] present in solution at equilibrium when the complexing agent ammonia is added to a 0.025 M solution of AgNO3 to result in a [NH3]eq = 0.15 M.
Solubility constant (Ksp) for Ag(NH3)2 2+ is 1.7 * 10^7.
The concentration of [Ag+] present in the solution is 6.53 × 10⁻⁸ M
From the given information, the equation for the reaction between silver ion and ammonia can be represented as:
Ag⁺ + 2NH₃ ↔ [Ag(NH₃)₂]⁺
Given that the solubility constant (Ksp) for the product formed = 1.7 × 10⁷.
The solubility constant for this reaction can be expressed as:
[tex]\mathbf{Ksp = \dfrac{[Ag(NH_3)_2]^+}{[Ag^+][NH_3]^2} }[/tex]
where;
concentration of ammonia = 0.025 Mconcentration of silver nitrate = 0.15 M[tex]\mathbf{1.7 \times 10^7 = \dfrac{0.025}{(x)(0.15)^2}}[/tex]
[tex]\mathbf{1.7 \times 10^7 = \dfrac{1.1111}{x}}[/tex]
[tex]\mathbf{x = 6.54 \times 10^{-8} \ M}[/tex]
Therefore, we can conclude that the concentration of [Ag+] = x = 6.54 × 10⁻⁸ M.
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Which of the following is NOT a chemical reaction?
Select one:
a.
Hydrogen and oxygen combine to make water
b.
Ammonia breaks up into nitrogen and hydrogen
c.
Ice melts to form water
