ppm = mg/l = mg/kg
32 mg / 20 kg = 1.6 ppm
The concentration in ppm of sodium fluoride in tap water is 1.6 ppm.
What is ppm concentration?
ppm is an abbreviation for parts per million. It can also be expressed as milligrams per liter of a solution.It is a measurement which is equal to mass of a substance per unit volume .
One ppm is equivalent to the absolute fractional amount which is multiplied by a million . It is a best way to describe smaller concentrations in a mixture such as that of gases,liquids or solids . It is a ratio of two quantities which have the same unit. In its full form ppm is expressed as one in a million part.
Depending on the substance being measured 1 ppm is expressed in many different ways, out of which preferred ways are microliters per liter , milligrams per liter and micrograms per liter.
For the given problem, concentration in ppm is found out as, since ppm is miiligrams per liter the concentration is found out as follows:32 mg/20 kg (since kilograms and liters are equivalent) =1.6 ppm
Thus, the final concentration of sodium fluoride in tap water which is fluorinated is 1.6 ppm.
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24. When density decreases, the number of
molecules in a volume
A increases.
B decreases
C stays the same
D varies
Solve
A gas occupies 9 L at a temperature of 325K. What is the volume at 450?
O 125L
ОЗК
O 302
O 87 L
The volume of a gas that occupies 9 L at a temperature of 325K is 12.46L.
How to calculate volume?The volume of a given gas can be calculated using the following Charle's law equation:
V1/T1 = V2/T2
Where;
T1 = initial temperatureT2 = final temperatureV1 = initial volumeV2 = final volumeV1 = 9LV2 = ?T1 = 325KT2 = 450K9/325 = V2/450
325V2 = 4050
V2 = 4050/325
V2 = 12.46L
Therefore, the volume of a gas that occupies 9 L at a temperature of 325K is 12.46L.
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How many moles are contained in 39 L of F2 gas at STP?
The number of moles contained in 39 L of F2 gas at STP is 1.74mol. Details on how to calculate number of moles can be found below.
How to calculate number of moles?The number of moles of a gas at STP can be calculated using the following formula:
PV = nRT
Where;
P = pressureV = volume n = number of moles R = gas law constantT = temperatureAt STP, the following applies:
T = 273KP = 1 atmR = 0.0821 Latm/molK1 × 39 = n × 0.0821 × 273
39 = 22.41n
n = 1.74mol
Therefore, the number of moles contained in 39 L of F2 gas at STP is 1.74mol.
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What is the molarity of a 250. mL H, SO4 solution that was made from a 20.0 mL of a 10.0 M stock solution?
F) 0.800M
G)1.25M
H)125M
J)500. M
The molarity of a 250. mL H2SO4 solution that was made from a 20.0 mL of a 10.0 M stock solution is 0.8M.
How to calculate molarity?The molarity of a solution can be calculated using the following expression:
CaVa = CbVb
Where;
Ca = concentration of acidCb = concentration of baseVa = volume of acidVb = volume of baseIn this question;
Ca = ?Va = 250mLCb = 10MVb = 20mLCa × 250 = 10 × 20
250Ca = 200
Ca = 200/250
Ca = 0.8M
Therefore, the molarity of a 250. mL H2SO4 solution that was made from a 20.0 mL of a 10.0 M stock solution is 0.8M.
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The chemical formula for water is what does the formula show about each element in the compound?.
This states that
1 molecule of water contains
2 hydrogens(H)1 Oxygen(O)And if we write the chemical reaction
2H_2+O_2—›2H_2O1a. Review What holds the hydrogen and oxygen
atoms together in a water molecule?
What are the three types of stresses that can be applied to
a system at equilibrium?
Answer:
The 3 stressers are 1. Adding or removing reactants or products. 2. Changing the total pressure or volume. 3. changing the tempature of the system.
Explanation:
All three of these are stressers that can be applied.
-Hope This Helps!
-Justin:)
Oxygen gas occupies a volume of 95 ml at 305 k. what volume will it occupy at 550 k?
The new volume of the oxgen gas as the temperature is increased is 171.3ml.
Given the data in the question;
Initial olume of oxygen gas; [tex]V_1 = 95ml = 0.095L[/tex]Intial temperature; [tex]T_1 = 305K[/tex]Final temperature; [tex]T_2 = 550K[/tex]Final volume of oxygen gas; [tex]V_2 = \ ?[/tex]Charles's lawCharles's law states that "the volume occupied by a definite quantity of gas is directly proportional to its absolute temperature.
It is expressed as;
[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]
To determine the new volume of the oxgen gas as the temperature is increased, we substitute our given values into the expression above.
[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}\\ \\ \frac{0.095L}{305K} = \frac{V_2}{550K}\\\\V_2 * 305K = 0.095L * 550K\\\\V_2 * 305K = 52.25LK\\\\V_2 = \frac{52.25LK}{305K} \\\\V_2 = 0.1713L\\\\V_2 = 171.3ml[/tex]
Therefore, the new volume of the oxgen gas as the temperature is increased is 171.3ml.
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A mixture of heptane (bp 98oC) and 1-propanol (bp 97oC) is not fully resolved using SE-30 as the stationary phase, but is easily separated using a column of DEGS. Explain with your own words.
A mixture of heptane and 1-propanol easily dissolved using DEGS because diethylene glycol sussinate (C8H14O6) 1 propanol easily dilutes and retain surface.
What is mixture?Generally, a mixture speaks to the joining of two different substance in other to achieve a different substance or something combining or becoming matched.
In conclusion, SE-30 is neutral in nature, DEGs is a stationary phase containing a non-volatile liquid phase. It also includes polar group OH types,
Hence, using Hydrogen bonding it can easily bind 1-propanol.
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Can someone pls tell me the answer to these 2 fill in the blanks I will surely mark him as the brain list answer
Can anyone help me please
Explanation:
The Animal meat contains Vitamins, proteins and carbohydrates and many more,
The other food group includes various minerals, (like copper, Calcium, Sodium, Phosphorus, selenium, cobalt, iron, zinc etc) various Amino acids, Fatty acids, water and albumin
The sources of vitamin like B12 are animals, and vegetarian should consume plant based supplements to fulfill the need of essential macromolecules!
[Side note: Meat consumption is secondary cause of increasing global warming Go vegan!]
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what is the numerical value of gold silver and platinum?
What cell structure is best represented by the image?
A.
a permeable exoskeleton
B.
a waterproof nuclear envelope
C.
a non-permeable cell wall
D.
a selectively permeable membrane
A
Explanation:
What cell structure is best represented by the image?
A.
a permeable exoskeleton
B.
a waterproof nuclear envelope
C.
a non-permeable cell wall
D.
a selectively permeable membrane
Riley took a train ride to Florida for vacation. It
took 67 hours to travel a distance of 1,546
kilometers. What was the speed of the train?
Answer: 23
I hope this helps! Have a good day! :)
Cyclohexane can be manufactured from hexane as shown in the equation.
C6H14 C6H12 + H2
Calculate the mass of cyclohexane that can be made from 258 g of hexane.
[Mr
of cyclohexane = 84
Mr Hexane = 86 g/mol
mol hexane = 258 : 86 = 3
mol cyclohexane = mol hexane = 3
mass cyclohexane = 3 x 84 = 252 g
Write a chemical equation for the acid/base reaction that produces the salt potassium sulfate?
Answer:
KOH + H2SO4 --> K2SO4 + H2O
In this performance task, students will analyze nutrition labels of some of
the foods and drinks that they recently consumed. They will identify which type of
macromolecule (carbohydrates, lipids, proteins) is mainly supplied by the item and they will
compare their consumption with the daily recommended intake for that type of
macromolecule. Students will also investigate salt and added sugar as well as vitamins and
minerals in the item. Finally, students will attach the nutritional labels in a short bond paper.
Explanation:
Globalization is the word used to describe the growing interdependence of the world's economies, cultures, and populations, brought about by cross-border trade in goods and services, technology, and flows of investment, people, and information
Helium is an example
of a gas because
A. helium does not take the shape of its
container.
B. helium particles are very randomly spaced
and moving freely.
C. helium particles are electrically charged.
D. helium cannot change its size or shape to fit
its container
Answer:
B
Explanation:
The particles move freely
Please help me and thank you and need this before Monday
How many grams of sodium metal is required to react with 0.950 grams of chlorine gas?
In a reaction involving sodium metal and chlorine gas, the amount of sodium metal required to react with 0.950 grams of chlorine gas would be 0.62 grams
Stoichiometric calculationFrom the balanced equation of the reaction:
2Na (s) + Cl2 (g) ---------> 2NaCl (s)
The mole ratio of Na to Cl2 is 2:1.
Mole of 0.950 grams of chlorine gas = 0.950/70.906
= 0.0134 moles
Equivalent mole of Na = 0.0134 x 2 = 0.0268 moles
Mass of 0.0268 moles Na = 0.0268 x 22.99
= 0.62 grams
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what does this diagram show and what order is it in?
Answer:
Individual.
Explanation:
The diagram is showing how the biosphere is composed of, ending at ecosystem. Within an ecosystem, there is a community. Within a community, there are different populations. In one population, there are individuals that make it up.
So, since individuals make up a population, populations making up a community, and communities making up ecosystems, you find your Q to be individual.
-------------------------------------------------------------------------------------------------------------
I hope this helps!
-No one
Based on the electron configuration of the two atoms, predict the ratio of metal cationic (+) atom to nonmetal anionic (-) atom in the compound.
magnesium 1s22s22p63s2
bromine 1s22s22p63s23p64s23d104p5
a. 1:1
b. 1:2
c. 2:1
d. 3:1
The ratio of metal cationic (+) atom to nonmetal anionic (-) atom in the compound is 1:2.
What is electron configuration?The term electron configuration shows the arrangement of electrons in an atom. We have the configurations of the atoms as follows;
magnesium - 1s22s22p63s2
bromine - 1s22s22p63s23p64s23d104p5
We can see that the catio is Mg^2+ and the anioin is Br^- hence the ratio of metal cationic (+) atom to nonmetal anionic (-) atom in the compound is 1:2.
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How are elements organized on the modern periodic table?.
Answer:
They are organized from least to greatest by their atomic number.
Explanation:
Hope that helps!
Answer:
Explanation:
Elements are listed in numerical order by atomic number. The atomic number is the number of protons in an atom of that element. So element number 1 (hydrogen) is the first element. Every atom of hydrogen has 1 proton. Until a new element is discovered, the last element on the table is element number 118. Every atom of element 118 has 118 protons. This is the biggest difference between today's periodic table and Mendeleev's periodic table. The original table organized the elements by increasing atomic weight.
Each horizontal row on the periodic table is called a period. There are seven periods on the periodic table. Elements in the same period all have the same electron ground state energy level. As you move from left to right across a period, elements transition from displaying metal characteristics toward nonmetallic properties.
Each vertical column on the periodic table is called a group. Elements belonging to one of the 18 groups will share similar properties. Atoms of each element within a group have the same number of electrons in their outermost electron shell. For example, elements of the halogen group all have a valence of -1 and are highly reactive.
There are two rows of elements found below the main body of the periodic table. They are placed there because there wasn't room to put them where they should go. These rows of elements, the lanthanides and actinides, are special transition metals. The top row goes with period 6, while the bottom row goes with period 7.
Each element has its tile or cell in the periodic table. The exact information given for the element varies, but there is always the atomic number, the symbol for the element, and the atomic weight. The element symbol is a shorthand notation that is either one capital letter or a capital letter and a lowercase letter. The exception is the elements at the very end of the periodic table, which have placeholder names (until they are officially discovered and named) and three-letter symbols.
The two main types of elements are metals and nonmetals. There are also elements with properties intermediate between metals and nonmetals. These elements are called metalloids or semimetals. Examples of groups of elements that are metals include alkali metals, alkaline earths, basic metals, and transition metals. Examples of groups of elements that are nonmetals are the nonmetals (of course), the halogens, and the noble gases.
What is the brown liquid for that the grasshopper may “spit” out?
Answer:
It is called "tobacco juice"
Explanation:
When a grasshopper is picked up they spit the brownish liquid known as "tobacco juice." They use it as some sort of defense mechanism to protect them from attacks by predators.
Hope this helps:)...if not then sorry for wasting your time and may God bless you:)
Increasing the amplitude means you are increasing what of a wave?
Need help with predicting products
Na3PO4
+
ZnSO4
Answer the question!
Answer:
i think 50C
Explanation:
It only makes since cause if its 4.43 and u want the volume to be 3.13 it has to me 50C
Use Charles law
[tex]\\ \rm\rightarrowtail V_1T_2=V_2T_1[/tex]
[tex]\\ \rm\rightarrowtail 4.43T_2=(70)(3.13)[/tex]
[tex]\\ \rm\rightarrowtail 4.43T_2=219.1[/tex]
[tex]\\ \rm\rightarrowtail T_2=49.4°C[/tex]
A teacher drops a bottle containing sodium chloride. The bottle breaks when it
hits the floor. The teacher sweeps up the mixture of sodium chloride and glass.
Describe how the teacher can obtain a pure, dry sample of sodium chloride from
the mixture.
The mixture of sodium chloride and broken glasses can be separated by dissolution, filtration, and evaporation respectively.
Separation of mixtureThe mixture containing sodium chloride and broken glasses can be separated as follos:
First, by dissolving the mixture in water. The soluble sodium chloride will dissolve while the broken glasses will remain insoluble.Filteration is carried out to filter off the broken glassesThe filtrate which is now a mixture of water and sodium chloride can then be heated to evaporate off the water and to obtain dry sodium chloride.More on separating mixtures can be found here: https://brainly.com/question/863988
What makes an acid a strong acid in water makes a base or weak base
Acids or bases with strong bonds remain as molecules in solutions known as weak acids or bases. The acids or bases with weak bonds easily dissociate into ions and are called strong acids or bases.
What is acid or base?Acid is proton donor hydrogen containing substance. Base is proton acceptor molecule.
It can be predicted by pH indicator. pH with value less than 7 indicate acidity and value with more than 7 denotes base, and the one with value 7 is considered as neutral.
Thus, based on bond strength and its dissociation in the water makes it strong acid or weak base.
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how many miles of oxygen gas were used to produce 8.0 moles of water
Answer:
4 moles
Explanation:
Oxygen gas is O2 (two atoms of oxygen)
2 H2 + O2 = 2 H2 O
one mole of oxygen gas produces TWO moles of water
so you need 4 moles of O2 to produce 8 moles of water
How many nickel atoms are contained in a 92.02 mole sample
Answer:
By definition, and this is what Avogadro's constant tells you, 1 mole of nickel must contain 6.022⋅1023 atoms of nickel.
Explanation:
