A sample of 450.0 g of water is found to contain 180 mg Cd. What is this concentration in parts per million?
Answers
Answer:
The correct answer is 399.8 ppm
Explanation:
A concentration in parts per million (ppm) is equal to:
\(1 ppm = \frac{1 g solute}{10^{6}g solution}= \frac{1 mg solute}{1 kg solution}\)
Solute: Cd; Mass = 180 mg x (1 g/1000 mg) = 0.18 g
Solvent: Water ; Mass= 450.0 g x (1 kg/1000 g) = 0.45 kg
We have the following total mass of solution:
Mass of solution = Mass of solute + Mass of solvent = 0.18 g + 450 g = 450.18 g = 0.45018 kg
Finally, we divide the mass of solute (in mg) into the mass of solution (in kg) to obtain the ppm (in mg/Kg):
ppm = 180 mg/0.45018 kg = 399.8 mg/Kg = 399.8 ppm
Related Questions
Which statement is not true?
A. When atoms are combined together they always form molecules
B. When atoms are combined together they always form compounds
C. A molecule has more than one type of the same atom
Answers
Answer:
A
Explanation:
Because when atom combine in a bond they form molecules
Hydrogen atom +Hydrogen atom =Hydrogen molecule
H+H====== H₂
Make me brainliest
Can somebody help me with this, please? Please Asap
Answers
Answer:
im not sure what exactly you want? if its answering the questions then search up each one and rephrase the answers you get, for instance for mitochondria is the powerhouse of the cell. just write something simple thats what i did when i had to do something like this it took only a couple of minutes
Explanation:
The Organelles help the cell to function efficiently.
What are the organelles in the cell?I can see that your question has to do with the organelles in the cell but I don't quite get the analogies that you intend to use. However, I would explain the organelles one after the other.
Endoplasmic reticulum: The endoplasmic reticulum (ER) is a network of membranous tubes and sacs within the cytoplasm of eukaryotic cells. It serves as a transport system for proteins and lipids, as well as a site for folding and modification of newly synthesized proteins.
Ribosomes: Ribosomes are complex molecular machines that are found in the cytoplasm of all living cells. They are responsible for synthesizing proteins from amino acids, which are the building blocks of proteins.
Mitochondria: These are organelles found in the cytoplasm of eukaryotic cells. They are often referred to as the "powerhouses" of the cell because they are responsible for producing most of the cell's energy in the form of ATP (adenosine triphosphate).
Vacuole: Vacuoles are membrane-bound organelles found in eukaryotic cells. They are large, fluid-filled compartments that serve several important functions within the cell, including storage of nutrients and waste, regulation of the cell's water balance, and maintenance of cell shape.
Cytoplasm: Cytoplasm is the gel-like substance that fills the interior of eukaryotic cells, excluding the nucleus. It is a complex mixture of water, ions, organic molecules, and a variety of cellular structures, including organelles such as mitochondria, ribosomes, endoplasmic reticulum, and lysosomes.
Lysosomes :Lysosomes are membrane-bound organelles found in eukaryotic cells. They are referred to as the "garbage trucks" of the cell because they are responsible for breaking down and recycling cellular waste and unwanted material.
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Which type of soil can retain the greatest amount of water?
Answers
Answer:
Clay soil
Explanation:
\({ \sf{}}\)
Clay soil
EXPLANATION:
Clay soil has small, fine particles, which is why it retains the most amount of water.
Hope it helps u!
Which of the following statements correctly describes a difference between mechanical waves and electromagnetic waves?
A.
Mechanical waves require a medium to travel through, whereas electromagnetic waves can travel through empty space.
B.
Electromagnetic waves transfer energy, whereas mechanical waves only transfer matter.
C.
Mechanical waves transfer energy, whereas electromagnetic waves only transfer matter.
D.
Electromagnetic waves require a medium to travel through, whereas mechanical waves can travel through empty space.
Answers
Answer:
Which of the following statements correctly describes a difference between mechanical waves and electromagnetic waves?:- Mechanical waves require a medium to travel through, whereas electromagnetic waves can travel through empty space.is the correct
pls mark me as brainliest pls
Answer:
Mechanical waves require a medium to travel through, whereas electromagnetic waves can travel through empty space.
Explanation:
Edge
Water is one of the most important things to you, and to all living things. The fact that you can measure the volume of room temperature water with a beaker is a clue that room temperature water is in liquid form. If you keep raising the temperature of that water, it will eventually begin to boil, bubbling up and releasing steam. The steam is an example of what? *
Answers
Answer:
steam is and example of vapor and gas.
Answer:
evaporation
Explanation:
because the water boils and steam leave so it's evaporation
How does brittleness of graphite compare to diamonds?
Graphite is more brittle than diamonds.
Graphite is less brittle than diamonds.
Graphite has the same brittleness to diamonds.
Graphite and diamonds are both very brittle.
Answers
Answer:
A
Explanation:
Because Graphite is more brittle than diamonds.
hope this work.
Given the balanced equation: Pb(NO₃)₂(aq) + 2NaCl(aq) ➔ PbCl₂(s) + 2NaNO₃(aq). What type of reaction is represented by this equation
Answers
Answer: The given reaction is a double displacement reaction.
Explanation:
A chemical reaction in which two different compounds chemically react with each other by switching places of both positive and negative ions is known as a double displacement reaction.
For example, \(Pb(NO_3)_2(aq) + 2NaCl(aq) \rightarrow PbCl_2(s) + 2NaNO_3(aq)\)
Here, both \(Pb^{2+}\) and \(Na^{+}\) ions switched places. Also, both \((NO_3)^{-}_{2}\) and \(Cl^{-}\) ions switched places.
Therefore, we can conclude that the given reaction is a double displacement reaction.
How does an atom change if all of its electrons are removed?
p.s. I'll mark the first answer the brainliest if it is correct! ;)
a. The atom’s volume increases.
b. The atom’s mass increases.
c. The atom becomes positively charged.
d. The atom becomes negatively charged.
Answers
c. The atom becomes positively charged
if the electrons are removed it means theres no longer a negative charge to balance the positive charge of the protons in the atom
What is the charge on the Cr in Cr2O72-
Answers
Answer:
+6.
Explanation:
So, a chromium atom here has an oxidation number of +6.
what is the function of the two microscope lenses?
Answers
pls help por favor i dont understand
Answers
Answer:
It's C!
Explanation:
when the amplitude was doubled the energy went up 4x
Did it already
If heat or energy is absorbed during a chemical reaction, then the reaction is considered:
endothermic
synthesis
combustion
exothermic
Answers
If heat or energy is absorbed during a chemical reaction, then the reaction is considered as an endothermic reaction. The enthalpy change of an endothermic reaction is positive.
What is an endothermic reaction ?The reaction in which heat energy is absorbed by the reactants is called an endothermic reaction. The enthalpy change in an endothermic reaction is positive.
The reaction in which heat is evolved from the system to the surroundings is called an exothermic reaction in which the enthalpy change is negative.
By absorbing heat energy, reactants becomes energetic enough to overcome the barrier potential of the reaction. Therefore, the potential energy diagram of an endothermic reaction will show less energy for reactants than that of products.
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Which statement explains the difference in chloroplasts between the two types of plant cells?
A.
The leaf cells have larger chloroplasts because leaf cells need more support and a stronger structure.
B.
The root cells have smaller chloroplasts because root cells do not need to store food and water.
C.
Unlike the leaf cells, the root cells have no chloroplasts because root cells do not need to produce or use energy.
D.
Unlike the root cells, the leaf cells have many chloroplasts because leaf cells produce sugars for the plant.
Answers
Answer:
A
Explanation:
I think it a because it seems more like the right answer
help pls i will give brainlest
Answers
Answer: its 5ft tall and 12 inches
Explanation:
The six kingdom system was designed
to account for great variation in the
kingdom that contained the
Answers
Answer:
prokaryotes
I got it right
NEED HELP PLEASE
WILL GIVE BRAIN
Answers
Answer:
the answer is 0.15
Explanation:
(Science) Please help with question 3.
Answers
____________ limits or stops the growth of bacteria.
Antibiotics
Antibiotics
Chemicals
Chemicals
Photosynthesis
Photosynthesis
Vaccines
Answers
Answer:
Vaccines
Explanation:
Explanation: I had this question and got it right
Do balanced or unbalanced forces make an object move?
Answers
The speedometer in a car does not measure the car’s velocity because velocity is
Answers
Answer:
Speed in a specific direction
Explanation:
Answer:
It does not indicate the car's direction.
Explanation:
Since velocity is both magnitude and direction, the speedometer measures speed but does NOT measure velocity
How to work out the relative mass of potassium? What is the calculation? ( explained very easily )
Answers
Answer:
39
Explanation:
Relative mass does not need to be calculated as it is listed on the periodic table. Potassium's relative atomic mass is around 39.
———————————
(1/12)th Mass of one C12 atom
Ruby has observed that plants in her garden vary in height. She wants to investigate whether a plant species (species A) grows faster than the other garden species (species B, C, and D). Select the statement that describes Ruby gathering enough evidence to support a scientific explanation concerning plant growth rates.
Note: Consider reviewing how Ruby developed her conclusion on page 8 of this lesson to select the best answer.
(1 point)
Responses
Ruby measures the heights of several species A, B, C, and D plants for a week under different conditions and finds a journal article that describes the growth rate of species A.
Ruby measures the heights of several species A, B, C, and D plants for a week under different conditions and finds a journal article that describes the growth rate of species A.
Ruby measures the height of a species A plant for a week and finds an anonymous gardening blog that describes the growth rate of species A.
Ruby measures the height of a species A plant for a week and finds an anonymous gardening blog that describes the growth rate of species A.
Ruby measures the heights of several species A, B, C, and D plants, each species for one week at a time for four consecutive weeks.
Ruby measures the heights of several species A, B, C, and D plants, each species for one week at a time for four consecutive weeks.
Ruby measures the heights of several species A, B, C, and D plants for a week under the same conditions and finds journal articles that describe the growth rates of each species. Brainliest
Answers
Answer: Tens place.
Step-by-step explanation: hmm wait one moment
Hope this helped!
Some animals only have _______ cells
Answers
Answer:
Animals can have up to 40 trillion cells.
An amoeba (type of animal) has just one cell.
Keesha performed a chemical reaction and the products looked quite different from the reactants. She knew the amount of matter had not changed due to the law of conservation of mass. According to the law of conservation of mass, what happens in a chemical reaction?
Answers
Answer:
matter can't change, but mass can differ
Explanation:
so i don't know what the answer would be so have fun with this
Answer:
matter is not created or destoryed and the amount of mass may change after the reation
hope this helps
Explanation:
Which changes occur when Pt2+ is reduced? A) The Pt2+ gains electrons and its oxidation number increases. B) The Pt2+ gains electrons and its oxidation number decreases. C) The Pt2+ loses electrons and its oxidation number increases. D) The Pt2+ loses electrons and its oxidation number decreases.
Answers
Answer:
C
Explanation:
What does it mean when a material can reflect light?
Answers
Answer:
Reflection is when light bounces off an object. If the surface is smooth and shiny, like glass, water or polished metal, the light will reflect at the same angle as it hit the surface. This is called specular reflection. Light reflects from a smooth surface at the same angle as it hits the
Explanation:
pls follow me if this truely helped u
1.In this environment, which trait is adaptive for the birds
2. Did the birds choose to have the adaptive trait? (yes or no)
3.Sherman suggests that reproduction always creates individuals with adaptive traits. Does this seem correct? Why or why not?
Answers
Answer:
1.Natural selection is the mode of evolution that makes living things well-suited (adapted) to their environments. This mechanism has sculpted the beaks, feet, and plumage of birds over millions of years, making these animals more successful in their environments.
2.yes
3.
Explanation:
Im sorry only 1, 2 I can answer!
But hope it helps you!
You can report me if you want!
What happened when the two substances were combined together in the cup? (highlight one)
The substances changed into different substances.
The substances did not change into different substances.
I am not sure if the substances changed into different substances.
Explain your answer using evidence from the Sim.
Answers
Based on evidence from Sim, when two substances were combined they did not change into different substances.
Here the word Sim is used to describe the process simulation. Simulation is defined as when two substances combined they do not change into different substances.
They just combine together and form a new substance.
Let us understand it as the first substance is liquid and the second substance is solid then when we combine both of them they form a new mixture but do not change their property.
The mixture is still liquid but it also has some properties of solid substance.
For more details about Sim,
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The substances did not change into different substances.
Based on the information provided in the question, there is no evidence or indication of any chemical reaction or change in the substances when they were combined in the cup. The question does not mention any observations or effects that would suggest a chemical transformation.
If there were a chemical reaction or change, it would typically be accompanied by observable signs such as color change, gas production, temperature change, or formation of a precipitate. However, since the question does not provide any evidence or observations of such changes, we can conclude that the substances did not undergo any chemical transformation when combined.
It is important to note that without additional information or details about the substances and their behavior, it is not possible to make definitive conclusions. However, based on the given information, the most reasonable conclusion is that the substances remained unchanged when combined in the cup.
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A student wanted to test how the mass of a paper airplane affected the distance it would fly. Paper clips were added before each test flight. As each paper clip was added, the plane was tested to determine how far it would fly.
What was the dependent (outcome) variable from this experiment?
The paper airplane design.
The number of paperclips.
The type of paper.
The distance the plane flies.
Answers
Answer:
The distance the plane flies.
Explanation:
This is the dependent (outcome) variable because it is changing depending on the number of paper clips that are added to the plane.
Answer:
The distance the plane flies.
Explanation:
The corn crop in an area is prone to infestation by larvae from moths that feed on the cornstalks and ears of corn. The techniques used by two farmers to protect the corn crop are described below.
Technique A: Sprayed his corn crop with an insecticide. The insecticide is known to kill all honeybee, butterfly, and moth larvae.
Technique B: Used a genetically modified variety of corn. The plant produces an insecticide which selectively kills only the moth larvae as it feeds on the corn.
Which technique is likely to have less of an impact on the environment?
Technique B because it may help humans who consume corn to fight bacteria
Technique A because it kills a broader variety of insects to protect the corn
Technique B because it preserves the harmless insects and targets only the moth larvae
Technique A because insecticide use is better for preserving the environment.
Answers
Answer:
Its C
Explanation:
Method A puts a type of spray that kills bees plus butterfly's which would make their population decrease. Which isnt helpful and harms the enviroment a lot. Answer A dosent make sense it may be harmful
Answer: c
Explanation:
I took the quiz