Explanation:
As the total concentration is given as 1.2 mM. And, it is also given that salt present in the solution is NaCl.
As sodium chloride is an ionic compound so, when it is added to water then it will dissociate into sodium and chlorine ions as follows.
[tex]NaCl \rightarrow Na^{+} + Cl^{-}[/tex]
So, it means in total there will be formation of 2 ions when one molecules of NaCl dissociates.
Therefore, concentration of chlorine ions will be calculated as follows.
Concentration of [tex]Cl^{-}[/tex] ions = [tex]\frac{1.2mM}{2}[/tex]
= 0.6 mM
Thus, we can conclude that the concentration of chloride ions is 0.6 mM.
In a 1.2 mM solution of NaCl, which fully dissociates into its constituent ions in solution, the concentration of chloride ions is also 1.2 mM.
Explanation:The concentration of chloride ions in a 1.2mM aqueous solution of NaCl can be determined by understanding that NaCl dissociates completely into its constituent ions in solution. For every molecule of NaCl, there is one sodium ion (Na+) and one chloride ion (Cl-).
Given that the total ion concentration in the solution is 1.2mM, and knowing that NaCl dissociates fully into Na+ and Cl-, we can infer that the concentration of each ion is also 1.2mM. Therefore, the concentration of chloride ions in the solution is 1.2 mM.
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Which occurs whenever valence electrons are shared or transferred between atoms
A. A Decrease in change
B. Radioactive decay
C. An increase in change
D. A chemical reaction
Final answer:
Correct answer - D. Whenever valence electrons are transferred between atoms, a chemical reaction occurs, leading to the formation of ionic or covalent bonds and the creation of ions.
Explanation:
The occurrence described in the question, where valence electrons are shared or transferred between atoms, corresponds to option D, A chemical reaction. This is a central concept in chemistry where elements interact to form compounds. When an atom gains or loses electrons, it becomes an ion: a cation if it loses electrons (and therefore has a positive charge), or an anion if it gains electrons (resulting in a negative charge). The transfer of electrons leads to the formation of ionic bonds, as seen in the production of table salt from sodium and chloride. When electrons are shared between atoms, this typically leads to the creation of covalent bonds.
Ethylene glycol is used as an antifreeze in car. if 400 g of ethylene glycol is added to 4.00 kg of water, what is the molaity? calcualte how much the freezing point of water will be lowered. The freezing point depression constant for water is Kf=-1.86
(science Q.1)
please help
What is the mass number of an isotope of this atom that has 2 neutrons?
Listed in the Item Bank are a number of key events from this field. Some events have more details available when you click on them. Drag and drop the events in chronological order by placing each in its corresponding open rectangle. If there is overlapping, simply trace the dashed line down to the timeline for clarification.
ITEMBANK: Move to Bottom
Brown recognizes and names the cell nucleusHooke coins the word cell after viewing cork cells with primitive microscopePasteur disproves spontaneous generation and proposes germ theorySchleiden & Schwann propose cell theoryVirchow describes cell division; proposes that all cells arise from other cellsvan Leeuwenhoek discovers bacteria with his improved microscope
The chronological order of key events in cell biology begins with Hooke's coining of 'cell' in 1665, followed by van Leeuwenhoek's discoveries related to bacteria in the 1670s, Brown's identification of the cell nucleus in 1831, Schleiden & Schwann's cell theory in 1838, Virchow's description of cell division in 1855, and Pasteur's germ theory later in the century.
Explanation:The key events from the field of cell biology should be organized in the following chronological order:
Robert Hooke coined the term 'cell' in 1665 when he observed cork tissue under a microscope.
In the 1670s, Antonie van Leeuwenhoek improved upon the microscope and was able to discover bacteria and protozoa.
Much later in 1831, Robert Brown identified and named the cell nucleus.
In 1838, Schleiden & Schwann proposed the cell theory which states that all living organisms are composed of cells.
Rudolf Virchow in 1855 described cell division and proposed that all cells arise from other cells.
Finally, Louis Pasteur in the late 19th century disproved spontaneous generation and proposed the germ theory.
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How does alternate freezing and thawing of water cause weathering to occur? Freezing chemically alters the rock surfaces Water expands when it freezes and cracks rocks open Thawing causes rock particles to move from place to place
Answer: I think water expands when it freezes and cracks rocks open
Explanation:
Perspective influences how a person looks at a piece of art and its qualities.
a.
always true
c.
always false
b.
sometimes true
d.
Perspective is not relevant in the interpretation of art.
list three properties if the elements that are useful in sorting the elements.
Three properties of elements that can be used in sorting elements are; density, refractive index and melting/boiling point.
The properties that can be used to sort elements are intensive properties. These are properties that do not depend on the amount of substance present.
They are unique to each element and can serve as a kind of finger print to identify an element.
Three of such properties are;density, refractive index and melting/boiling point.
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Both white phosphorus and red phosphorus are made up only of phosphorus atoms.Does this mean they are both pure substances? Could they be compounds?
How many O2 molecules can be made with the oxygen from 492 g of sodium phosphate?
Final answer:
Without a chemical reaction formula, it's not possible to calculate the number of O2 molecules that can be made from 492 grams of sodium phosphate.
Explanation:
The number of O2 molecules made from 492 grams of sodium phosphate requires a stoichiometric calculation based on the chemical reaction involved. However, since no reaction is given, we cannot accurately determine the amount of O2 that could be produced from sodium phosphate. We would need the balanced chemical equation for the decomposition or reaction involving sodium phosphate to calculate the number of O2 molecules formed.
PLEASE ANSWER ASAP!
A golf ball is at rest on the grass. What must happen to cause the ball to move?
A balanced net force must be applied.
An unbalanced net force must be applied.
The net force must be zero.
The net force must be greater than the applied force.
An unbalanced net force must be applied.
30) Some common substances used in the laboratory are listed in the table. The chemical formulas of the substances are also listed beside their names.
How many of the listed items are elements?
A) 3
B) 4
C) 5
D) 6
Please Please Please hurry need help
The answer is c 5
Bahafbssna
which of these is an example of food engineering
Answer: Using fertilizer on crops to increase their yield
Explanation: Apex
what is the number of valence electrons in sodium?
PLEASE ANSWER ASAP!!!!! Object A has a mass of 12 g and a volume of 8 cm3. Object B has a mass of 20 g and a volume of 8 cm3. Which object has a greater density and by how much? A: Object A, by 1 gram per cubic centimeter B: Object A, by 8 grams per cubic centimeter C: Object B, by 1 gram per cubic centimeter D. Object B, by 8 grams per cubic centimeter
Which of the following is true about two neutral atoms of the element zinc?
They will always have different masses. Electrons are missing in both the atoms. Both have an equal number of protons. They have different properties.
Final answer:
Neutral zinc atoms will always have the same number of protons, designated by the atomic number (Z) which is 30. While the number of neutrons can differ, creating various isotopes with different masses, the chemical properties of these isotopes are the same. Thus, the factual statement is that both atoms have an equal number of protons.
Explanation:
The question you've asked pertains to the nature of zinc atoms. Neutral atoms of zinc, like all other elements, will have the same number of protons, which is determined by the element's atomic number (Z). For zinc, the atomic number is 30, meaning that each zinc atom has 30 protons.
One of the key points to understand is that the number of neutrons can differ in atoms of the same element, leading to different isotopes of that element. This means that while the number of protons (and electrons in a neutral atom) remains constant, the number of neutrons can vary, affecting the mass number (A) of the isotopes. However, this does not change the chemical behavior of the isotopes since they still have the same number of protons.
Given these fundamental principles, let's review your statements about two neutral atoms of zinc:
They will not always have different masses since two neutral atoms of zinc can be the same isotope.Electrons are not missing in both the atoms if they are neutral; they will have the same number of protons and electrons.Both have an equal number of protons since this defines the element zinc.They do not have different properties simply because they are isotopes; isotopes of an element share similar chemical properties.Therefore, the correct statement regarding two neutral atoms of zinc is that both have an equal number of protons.
What mostly determines the chemical properties of the atom of an element
Answer: the electrons i.e their valence electron
Explanation: valence electron is the number of electron in the outermost shell of an atom. Infact it is the combining power of an element. The valence electron gives us a better understanding of how an element will react with other elements. This is the reason why elements with the same number of valence electron(s) are grouped together telling us that they exhibit similar chemical properties
a 20 mL pipet sample of alcohol is found to weigh 15.71 g. What would be the mass of 35.25 mL of the same alcohol? What volume would 125.4 g of this alcohol occupy
Final answer:
To calculate the mass and volume of alcohol based on its density, we use basic principles of chemistry. The mass of 35.25 mL of alcohol is found to be approximately 27.69 g, and 125.4 g of the same alcohol would occupy approximately 159.65 mL.
Explanation:
The question involves calculating the mass of a certain volume of alcohol given its density and vice versa. First, we find the density of the alcohol using the initial 20 mL sample which weighs 15.71 g. The density (ρ) is mass (m) divided by volume (V), so ρ = 15.71 g / 20 mL = 0.7855 g/mL. Using this density, we can find the mass of 35.25 mL of the same alcohol which would be ρ * V = 0.7855 g/mL * 35.25 mL = 27.687375 g. To find the volume 125.4 g of this alcohol would occupy, we use V = m / ρ = 125.4 g / 0.7855 g/mL = 159.65 mL.
List the two main types of energy.
Answer: kinetic and potential energy
Explanation:
kinetic is energy of motion
energy that can move
potential is stored energy
energy that cant move
100% correct
Which process represent one chemical change and one physical change
what will happen if you add more solute to a saturated solution
what conditions are represented by the abbreviation stp
STP, or standard temperature and pressure, is defined as 0°C (273.15 K) and 1 atm pressure, allowing for standardized comparison of gas properties.
Explanation:The conditions represented by the abbreviation STP, which stands for standard temperature and pressure, are specifically chosen to provide a reference point for the comparison of the physical properties of gases. Generally, STP is defined as a temperature of 0°C or 273.15 K and a pressure of 1 atm (atmosphere).
However, it is important to note that there are slight variations in this definition, as some organizations like the International Union of Pure and Applied Chemistry (IUPAC) define STP as 0.986 atm, while for simplicity, others may use the rounded value of 1 atm. Despite this, the concept of STP is invaluable for scientists as it allows for standardized comparisons across various gas measurements.
what are two ways non metalic minerals can be used?
A. Wiring and Gems
B. Conductors and for industrial purposes
C. Gems and as conductor
D. Industrial processes and gems
Reactions rates for reactions occurring in solution can be increased by increasing the concentration of the solution. With gases you can do something similar, which is to -
Which of the following methods can be used to separate salt and iron? Distillation Evaporation Filtration Magnetism
From a mixture of salt and iron, iron can be easily separated using a magnet if they are present as solid fillings. Thus option D is correct.
What is magnetism?Magnetism is the ability of a magnet to produce its own magnetic field and attracts magnetically susceptible objects into it. Iron is can acts as a magnet and it easily attracted by a magnet.
There are different methods for separating individual components from a mixture of them. The separation method is selected based on the physical properties of these substances.
From a mixture of salt and iron, iron can be easily separated using a magnet and all the iron fillings can be collected on to a magnet. Remaining salt can then be purified by dissolving in water and then evaporates off. Hence, option D is correct.
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at approximately what latitude do new york massachusetts and connecticut meet
Answer:
About 42° North latitude
Explanation:
Latitudes are defined as the lines that oriented in the east-west direction and they are parallel to the equator.
The 3 cities of the United States namely Massachusetts, New York, and Connecticut are on its eastern side The city of Connecticut, New York, and Massachusetts are situated at about (41.60° N and 73.09° W), (40.71° N and 74.01° W) and (42.41° N and 71.33° W) respectively.
These 3 cities are located adjacent to one another and they share a common point at a longitude of about 42° in the Northern hemisphere.
Thus, the above cities meet at about 42° N latitude.
In which situation will the reaction rate increase
Answer:
A) when a catalyst is added
Explanation:
The missing options are:
A) when a catalyst is added
B) when the temperature drops
C) when the pressure is lowered
D) when the molecules are large and bulky
A catalyst increases the rate of a chemical reaction without undergoing a permanent chemical change. They provide an alternative pathway to the reaction which has a lower activation energy than the non-catalyzed mechanism, this increase the reaction rate.
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Which pair of kingdoms include organisms which are all multicellular?
A. Animalia and Fungi
B. Animalia and Plantae
C. Protista and Fungi
D. Protista and Plantae
All living things are made of organic compounds which contain the element
A) carbon. B) hydrogen. C) oxygen.
Calculate the vapor pressure lowering on an aqueous solution of glycerin that contains 180g of glycerin and 1000g of water at 25c. The vapor pressure of water at this temperature is 23.8torr.