The chemist plans to identify the unknown liquid by measuring its density and comparing it to known densities. The densities of various substances are typically listed on Material Safety Data Sheets (MSDS).
To begin the identification process, the chemist should gather the MSDS for each substance mentioned in the note on the cabinet door: ethanolamine, methyl acetate, chloroform, tetrahydrofuran, and diethylamine. These MSDS will provide the density information needed to compare with the unknown liquid.
Next, the chemist should measure the density of the unknown liquid using a suitable instrument, such as a densitometer or hydrometer. It's important to ensure that the measurement is accurate and precise.
Once the density of the unknown liquid is determined, the chemist can compare it to the densities listed on the MSDS for the known substances. By finding a match between the measured density of the unknown liquid and the density of one of the known substances, the chemist can identify the unknown liquid.
For example, if the measured density of the unknown liquid matches the density of ethanolamine listed on the MSDS, then the chemist can conclude that the unknown liquid is ethanolamine. If there is no exact match, the chemist can use the closest density value as a potential identification.
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Explain why a climax community is not always a forest.
What is the molar mass of CoCl2•6H20?
Answer:
the molar mass of CoCl2•6H2O is 238.05 g/mol.
Explanation:
The molar mass of CoCl2•6H2O can be calculated by adding the atomic masses of each element in the compound.
Here's the calculation:
Cobalt (Co): 58.93 g/mol
Chlorine (Cl): 35.45 g/mol (2 atoms) = 70.9 g/mol
Hydrogen (H): 1.01 g/mol (12 atoms) = 12.12 g/mol
Oxygen (O): 16.00 g/mol (6 atoms) = 96.00 g/mol
Therefore, the molar mass of CoCl2•6H2O is:
58.93 + 70.9 + 12.12 + 96.00 = 238.05 g/mol
So, the molar mass of CoCl2•6H2O is 238.05 g/mol.
In a symbolic equation, chemical names are used for reactants and product. True or false
Answer
false
Explanation:
hope it helps.......
This is a false statement!
In the symbolic equation, chemical formulas are used instead of chemical names for reactants and products, while symbols are used to indicate the phase of each substance. It should be apparent that the chemical shorthand method is the quickest and clearest method for writing chemical equations.
When a leaf of fresh sage or mint is rubbed ,the fragrance is
immediately obvious. Write a theoretical explanation for this observation
Answer: Volatile compounds present in the fresh sage leaf or mint leaf evaporate on rubbing.
Explanation:
When fresh sage or mint is rubbed on the skin or any other surface the volatile chemicals associated with the integral structure of the plant part get evaporated in the surrounding air and the vapors can be detected by the olfactory receptors present in the nose. These receptors take the smell or fragrance stimulus and generate impulses or signals which goes to brain and brain interprets the smell or fragrance.
A house is 57.0ft ieng and 38.0ft wide and has B.0-ft-high celings. What is the volume of the interioe of the house in cubic meters and cubic centimeters? m3
Volume of the interior of the house in cubic meters = 487.1 m³
Volume of the interior of the house in cubic centimeters = 4.871 × 10^8 cm³
Given the dimensions of the house as 57.0ft length, 38.0ft width and 8.0ft high ceilings.
The volume of the house can be found by using the formula for the volume of a rectangular solid as:
V = lwh
where
V is the volume,
l is the length,
w is the width,
h is the height of the house
Given,
l = 57.0ft
w = 38.0ft
h = 8.0ft
Now, substituting these values in the formula for the volume of the house, we get;
V = lwh
= 57.0 ft × 38.0 ft × 8.0 ft
= 17248.0 cubic feet
We know that 1 cubic meter = 35.3147 cubic feet
Volume of house in cubic meters
V = 17248.0/35.3147 m³ = 487.1 m³
Thus, the volume of the interior of the house in cubic meters is 487.1 m³.
The volume of the interior of the house in cubic centimeters can be found by using the fact that 1 m³ = 10^6 cubic centimeters
Volume of the house in cubic centimeters = 487.1 × 10³ × 10^6= 4.871 × 10^8 cm³
Thus, the volume of the interior of the house in cubic centimeters is 4.871 × 10^8 cm³.
Volume of the interior of the house in cubic meters = 487.1 m³
Volume of the interior of the house in cubic centimeters = 4.871 × 10^8 cm³
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Why is air resistance important?
Answer:
air resistance affects the movement of the falling object by slowing it down.
Explanation:
With this information, we now need to calculate the volume in milliliters. We need to know how many mls a drop of oleic acid occupies using the density of 0. 895 g/ml and the number of drops of oleic acid solution used.
According to the density, there are m/0.895 milliliters in a drop of oleic acid and the total drop is 0.895/m of total volumes.
We need to know about the density to solve this problem. Density is a unit that measures how dense an object is. Density can be measured by dividing mass by volume. It can be written as
ρ = m / V
where ρ is density, m is mass and V is volume
From the question above, we know that
ρ = 0.895 g/mL
Assume that 1 drop of oleic acid is m gram. Hence,
ρ = m / Vdrop
0.895 = m / Vdrop
Vdrop = m/0.895 mL
Find the total drops
V = Vdrop x n
n = V / Vdrop
n = V / (m/0.895)
n = 0.895/m of total volumes
in a drop, there is m/0.895 mililiters of oleic acid and the total drop is 0.895/m of total volumes.
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Select the correct answer from the drop-down menu.
Photograph shows a mushroom shaped cloud of volcanic ash.
(blank) is the most likely resource to be found near the base of a volcano on Earth’s surface.
metal ore
i got this question before and answered this one correctly trust me its right
Answer:
metal ore
Explanation:
What the Purpose of seeds
Answer:
The purpose of all seed is reproduction and is to grow a new plant, thus propagating the species.
A leaking underground storage tank or wastewater pouring into a river from a pipe would be examples of
Answer:
Water pollution.
Explanation:
This is because water pollution refers to the release or disposal of harmful substances called contaminants which contaminate water bodies which include rivers, oceans, lakes e.t.c.. These harmful substances affect aquatic organisms and make water unfit for good use. This can lead to the death if aquatic lives in the water bodies, release of bad smells and make the water bad . A leaking underground storage tank or wastewater pouring into a river from a pipe can be a source of water pollution.
Under what conditions is the heat evolved or absorbed in a chemical reaction equal to the change in enthalpy of the reacting species?
The heat evolved or absorbed in an open system, where reactants and products are constantly in contact with their environment and there is constant pressure, is equivalent to the change in enthalpy.
Under conditions of constant pressure, the change in enthalpy of the reacting species equals the amount of heat evolved or absorbed in a chemical reaction. This is referred to as the reaction's enthalpy change (H). A thermodynamic property called enthalpy (H) denotes a system's overall heat capacity. The difference between the enthalpy of the products and the reactants determines the change in enthalpy of a reaction. The heat evolved or absorbed in an open system, where reactants and products are constantly in contact with the environment and there is constant pressure, is equivalent to the change in enthalpy (H), because the heat is being exchanged with the environment. The name of this law is Hess's Law.
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Polyethylene pipe is used to operate under low pressure, typically 10 to 20 psi.
a. True
b. False
It is true that polyethylene pipe performs optimally at low pressures of 10 to 20 psi.
What is the pressure rating of the polyethylene pipe?PE pipes can be utilized in a range of temperature of -40 oC to 60 oC taking into account the change of operating pressure. The nominal pressure class, and PN, up to PN 20 or 20 bar, is frequently used in the standard specification of HDPE pipes to identify their class.
Is PVC pipe the same as polyethylene pipe?PVC is a long-lasting vinyl polymer, whereas HDPE is a petroleum-based polyethylene thermoplastic. Both pipes withstand high temperatures with strength. HDPE has been shown to be more durable when comparing failure ratings when subjected to conditions like rain, stress, wind, heat, or cold.
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The best performance for polyethylene pipe occurs at low pressures of 10 to 20 psi, it is true.
The polyethylene pipe's pressure rating is what?When operating pressure changes, PE pipes are suitable for temperatures between -40 oC and 60 oC. To describe the class of HDPE pipes, the nominal pressure class, and PN, up to PN 20 or 20 bar, is usually used.
PVC and polyethylene pipes are the same, right?HDPE is a polyethylene thermoplastic made from petroleum, while PVC is a vinyl polymer with a long shelf life. The robustness of these pipes allows them to resist high temperatures. Comparing failure ratings in adverse situations like rain, stress, wind, heat, and chemicals has revealed HDPE to be more robust.
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CO₂ + H₂O → H₂CO3 → H* + HCO3 Review this formula and discuss the mechanisms involved in the forward and reverse components of the reaction by answering the following: 1. When CO₂ + H₂O
Forward component of the reaction When CO₂ is added to water, it dissolves and reacts to form carbonic acid (H₂CO3) in the forward reaction.
The formula CO₂ + H₂O → H₂CO3 → H* + HCO3 represents the carbon dioxide equilibrium. The forward and reverse components of the reaction can be explained as follows: H₂CO3 has two possible reactions: It either releases a hydrogen ion (H+) and forms bicarbonate (HCO3-) or it releases two hydrogen ions (2H+) to form carbonate (CO32-) and water (H₂O).
CO₂ + H₂O → H₂CO3 → H+ + HCO3Reverse component of the reactionWhen hydrogen ions (H+) are added to bicarbonate ions (HCO3-) or carbonate ions (CO32-), the reverse reaction takes place and carbonic acid (H₂CO3) is formed. Carbonic acid (H₂CO3) can also be decomposed into carbon dioxide (CO₂) and water (H₂O).
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Which of the following is the correct name for the compound H2O? Dihydrogen monoxide Dihydrogen monoxogen Hydrogen (I) oxide Hydroxide acid
Answer:
The correct answer is dihydrogen monoxide.
Explanation:
In chemistry, there are ionic bonds and molecular/covalent bonds. Because hydrogen and oxygen are both nonmetals, we can confirm that we are dealing with a molecular bond (ionic bonds are normally formed between a metal and a nonmetal).
Now, the naming of molecular compounds is sort of tricky. Instead of changing the endings of the element names like we do with ionic bonds, we add prefixes to the front of the element names in order to signify how many of that element are present in the compound.
Therefore, you will need to firstly find out how many atoms of each element are in the bond.
Water is typically written as \(H_{2}O\) in chemistry (the 2 is a subscript and denotes how many atoms are present of each element in a compound or bond). Therefore, we can confirm that there are two atoms of hydrogen (atomic symbol of H) and one atom of oxygen (atomic symbol of O).
This allows us to expand into prefixes and decide what prefixes you use for each amount of atoms. I have attached a table of these prefixes below for you to use if you need it for reference.
Using the table, we can see that the prefix for two atoms is di-. So, we will place this in front of hydrogen to give us dihydrogen (hydrogen is present twice in the compound or has two atoms present). Then, we always drop the ending of the second element in the compound and change it to -ide. Oxygen works differently than most elements (like Sulfur drops the -ur and becomes sulfide when present in molecular compounds) and drops the -ygen and then becomes named oxide. Finally, we have to add a prefix in front of oxygen (because it is otherwise confusing if we do not and can signify an ionic bond if we are not careful) and this prefix happens to be mono- (one atom of oxygen means that we use the prefix for one atom).
Putting all of this together, we get that \(H_{2}O\) is named dihydrogen monoxide, or more commonly, water.
A 35.40 gram hydrate of sodium carbonate, Na2CO3•nH2O, is heated to a constant mass. Its final weight is 30.2 g. What is formula for the hydrate?A. Na2CO3∙1H2OB. Na2CO3∙2H2OC. Na2CO3D. Na2CO3∙3H2O
First, we have to calculate the molecular weights of each molecule:
\(\begin{gathered} Na_2CO_3\text{ : 23*2+12+16*3= 106 g/mol} \\ H_2O\text{ : 1*2+16= 18 g/mol} \end{gathered}\)Then, we have to calculate the number of grams of water. We can calculate them because the process of evaporation lets us know the water amount that was retired:
\(g\text{ H}_2O\text{ = 35.40 g - 30.2 g=5.2 g H}_2O\)Then, we're gonna convert the grams of sodium carbonate alone (30.2 g) and the grams of water to moles:
\(\begin{gathered} 30.2\text{ g Na}_2CO_3\text{ * }\frac{1\text{ mol}}{106\text{ g}}=\text{ 0.2849 mol Na}_2CO_3\text{ }\approx0.3\text{ mol Na}_2CO_3 \\ \\ 5.2\text{ g H}_2O\text{ * }\frac{1\text{ mol}}{18\text{ g}}=\text{ 0.288 mol H}_2O\text{ }\approx\text{ 0.3 mol H}_2O \end{gathered}\)It means that the mole relation is 1:1 approx, as it is the same amount for both. Then, the formula is going to be:
\(Na_2CO_3\text{ . 1H}_2O\)It means that the answer is A.
PLEASE HELP ME!
Aspartame is an artificial sweetener that is 160 times sweeter than table sugar. It is marketed as Pal-Sweet. The molecular formula of aspartame is C¹⁴H18N²O5.
i) Name the elements that made up aspartame. [2 marks]
(ii) Calculate the relative molecular mass of aspartame. [2 marks]
(iii) Calculate the number of moles in 7.35g aspartame. [3 marks]
(iv) Calculate the number of molecules in 5.88 g aspartame. [2 marks]
(v) Calculate the mass in grams of one molecule of aspartame. (H=1, C=12, N=14, 0=16, N = 6 x 10²³mole) [3 marks]
Answer:
A. Carbon, Hydrogen, Nitrogen, and Oxygen
B. 12(14) + 1(18) +12(2)+16(5)= 294.20g
C. 7.35/294.3=0.0250mol
D. 5.88g/294.3=0.01997961264 × 6.02 × 10^2= 12.028
Explanation:
how does the involvement of energy in a decomposition reaction compare to how energy is involved in a combustion reaction?
In order for a decomposition reaction to proceed, it must not need an energy source. Exothermic reactions take place in combustion processes between reactants, which are often a fuel and an oxidant. Hydrocarbons are often used in combustion reactions.
What is combustion ?A fuel and an oxidant, typically atmospheric oxygen, engage in a high-temperature exothermic redox chemical reaction known as combustion, or burning, which results in the production of oxidized, frequently gaseous products in a mixture known as smoke.
The addition of energy starts the decomposition reactions. In a breakdown reaction, some chemical bonds in a complex are broken, resulting in the formation of simpler compounds. Chemical bonds must be broken with the input of energy, typically in the form of heat.
Multiple products are created from a single reactant in a decomposition process. When a chemical and oxygen are combined, the result is a combustion reaction that produces oxides of other elements as a byproduct.
Thus, Exothermic reactions take place in combustion processes between reactants, which are often a fuel and an oxidant.
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The visible spectrum for a colored solution has a maximum absorbance around 500 nm and a maximum % transmittance around 640 nm. What is the color of the solution?.
Green is represented with an absorption wavelength of 500 nm. As a result, it will absorb green and display red, which is complementary to green.
What is the electromagnetic spectrum?
The electromagnetic spectrum is made up of the many wavelengths and associated frequencies of light. The speed of light constantly establishes a relationship between shorter frequencies and longer wavelengths. Because they have the shortest wavelengths, gamma rays can ionize material. The longest lengths are found in radio waves, whose wavelengths can exceed 100,000 km.
Between the ultraviolet and infrared spectra, the visible spectrum has wavelengths.
This is a reference to spectroscopic techniques that calculate how much radiation interacts with a substance, depending on its frequency or wavelength, and how much of that radiation is absorbed. Absorption spectroscopy utilizes the full electromagnetic spectrum.
So, the correct option is green.
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Magnesium reacts with oxygen and nitrogen in the air at high temperatures. predict the binary formulas for the products. write the names of these compounds.
When magnesium reacts with oxygen in the air at high temperatures, the main product formed is magnesium oxide (MgO). The binary formula for magnesium oxide is MgO.
When magnesium reacts with nitrogen in the air at high temperatures, the main product formed is magnesium nitride (Mg3N2). The binary formula for magnesium nitride is Mg3N2.
The binary formula for the compound formed when magnesium reacts with oxygen is MgO, and its name is magnesium oxide. The binary formula for the compound formed when magnesium reacts with nitrogen is Mg3N2, and its name is magnesium nitride.
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2. A current is a part of a fluid that is moving continuously in a certain direction. Water is the
fluid
you used in Part 1 to show how uneven heating can produce a current. Name another
common fluid you could use toshow the same phenomenon.
When water moves in a certain direction because of uneven heating the phenomenon is called Convection. Fluids are substances that can flow. One example which can be subject to Convection is Air.
Convection in Fluids - AirWhen air is heated, it rises above dry and or cool air which is heavier. So the cool air is displaced most likely moves towards the source of the heat.
If the process of heating continues or is constant, this will create a movement between both kinds of air hence - convection occurs.
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The carbon atom has six total electrons in two energy levels. How many will be in each
level?
Answer:
5
Explanation:
Answer:
2 in the first and 4 in the second
Explanation:
in an atom the first energy level has only 2 spaces for electrons, as the number electrons goes up so does the amount of energy levels
.how many moles are in 100.0g of CuF2
Answer:
0.985
Explanation:
moles= mass/Mr
Mr is the molecular mass
Cu=63.5
F2=38
Mr=63.5+38=101.5
moles=100/101.5=0.985
round answer if needed
Q2. Calculate the number of moles of gas present in the following gases, at room
temperature and pressure, RTP, (20°C and atmospheric pressure). Assume molar
volume is 24dm³ or 24 000cm³.
a.
100cm³ of CO2
b. 200cm³ of H₂
150cm³ of ammonia, NH3
500cm³ of 0₂
200cm³ of methane, CH4
C.
d.
e.
f. 600cm³ of He
g. 2dm³ of N₂
ESO
Answer:
Calculate the number of moles of gas present in the following gases, at room
temperature and pressure, RTP, (20°C and atmospheric pressure).
Indicate the charge the following elements as they achieve the noble gas configuration.
Ga O Br P Rb As
S Mg Al Se Li I
Answer:
See explanation
Explanation:
Ga is in group 13 hence it must loose three electrons to form Ga^3+ in order to achieve the noble gas configuration because it has three electrons on its outermost shell.
O is in group 16 hence it must accept two electrons in order to attain the noble gas configuration to form O^2- since oxygen has six electrons on its outermost shell.
Br in group 17 has seven electrons in its outermost shell hence it must form Br^- (gain one electron) in order to attain the noble gas configuration.
P in group 15 must accept three electrons and form P^3- in order to attain the noble gas configuration since it has five electrons on its outermost shell.
S is in group 16 hence it must accept two electrons in order to attain the noble gas configuration to form S^2- since sulphur has six electrons on its outermost shell.
Mg in group 2 has two electrons on its outermost shell and must loose both to attain the noble gas configuration forming Mg^2+.
Al is in group 13 hence it must loose three electrons to form Al^3+ in order to achieve the noble gas configuration because it has three electrons on its outermost shell.
Se is in group 16 hence it must accept two electrons in order to attain the noble gas configuration to form Se^2- since selenium has six electrons on its outermost shell.
Lithium is in group 1 and must loose its only outermost electron in order to attain the noble gas configuration to form Li^+.
Rb is in group 1 and must loose its only outermost electron in order to attain the noble gas configuration to form Rb^+.
As in group 15 must accept three electrons and form As^3- in order to attain the noble gas configuration since it has five electrons on its outermost shell.
I in group 17 has seven electrons in its outermost shell hence it must form I^- (gain one electron) in order to attain the noble gas configuration.
If the mass of an object is 6 kg and its momentum is 72 kgm/s, what is its velocity?
A. 9 m/s
B. 12 m/s
C. 18 m/s
D. 72 m/s
The density of aluminum is 2.70 g/mL. The volume of a solid piece of aluminum is 1.50 ml. What is its mass?
Answer:
4.05g
Explanation:
density = mass / volume
mass = density x volume
mass = 2.7 x 1.5
mass = 4.05
What phrase describes a good scientific question?
has a wide focus
addresses a gap in knowledge
does not lead to a testable hypothesis
O has a simple yes or no answer
vious Activity
What is an addition reaction of alkenes ?
\(\huge\pink{\boxed{\tt{\colorbox{pink}{ANSWER}}}}\)
Chemical transformation of a carbon-carbon double bond is the addition reaction.
Explanation:
Consequently, if the bond energies of the product molecules are greater than the bond energies of the reactants, the reaction will be exothermic.
hope it helps
How does sunlight affect seasons?
Answer:
Seasons are caused by the Earth’s revolution around the Sun, as well as the tilt of the Earth on its axis. The hemisphere receiving the most direct sunlight experiences spring and summer, while the other experiences autumn and winter. During the warmer months, the Sun is higher in the sky, stays above the horizon for longer, and its rays are more direct.
a 0.0718 mol sample of an unknown gas contained in a 2.00 l flask is found to have a density of 1.51 g/l. the molecular weight of the unknown gas is g/mol.
The molecular weight of the unknown gas is 42.06 g.
Find out the molecular weight of unknown gas.The idea is that the density of the gas tells you the mass of this gas that occupies exactly 1 L under some unspecified pressure and temperature conditions.
In this case, you know that the density of the gas was 1.51g/L.
This means that 1.51 g/L of this gas occupies exactly 1 L under the pressure and temperature conditions used in the experiment.
You are also aware that the total volume of the flask is 2.00 L. At this point, you can use the density of the gas to calculate the mass of gas required to fill the given volume with the sample.
\(2.00 L . \frac{1.51g}{1L} =3.02g\)
You must now determine the mass of exactly one mole in order to determine the molar mass of the gas. Since you are aware that this sample contains 0.0718 moles of gas and weighs 12.5 g, you can infer that one mole will weigh that much.
\(1 mol. gas .\frac{3.02g}{0.0718} =42.06g\)
As a result, the gas's molar mass can be expressed as molar mass = 42.06 g/ mol.
This indicates that 42.06 g makes up 1 mole of this gas.
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