Determine the correct sequence of steps used in carrying out a measurement using a ph probe. Arrange them in order from first to last.
Answers
The correct sequence of steps used in carrying out a measurement using a pH probe is calibration, preparation of the sample, immerse the pH electrode in the sample and recording the pH value.
The steps used in carrying out a measurement using a pH probe are as follows:1. Calibration: The pH electrode must first be calibrated before taking any measurements. The electrodes are calibrated using standard buffer solutions with known pH values.2. Preparation of the sample: Samples must be prepared and placed in a clean container. The sample should be stirred slowly to ensure that the pH is uniform throughout the sample.3. Immerse the pH electrode in the sample: Immerse the pH electrode in the sample and wait for it to stabilize. The electrode must be rinsed with distilled water after each measurement to avoid contamination.4. Recording the pH value: Read the pH value on the display after the pH electrode has stabilized in the sample.
In summary, the pH probe must be calibrated before each measurement, and the sample must be prepared and placed in a clean container. The pH electrode should be immersed in the sample, and the pH value should be recorded after the electrode has stabilized.
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Related Questions
Which toxic substance is often used to extract gold and results in harmful environmental effects?
a. acid mine drainage
b. carbon dioxide
c. sulfur dioxide
d. cyanide
e. fluoride
Answers
Cyanide is the poisonous substance used to extract gold (d).
What is cyanide?The extraction of metals and electroplating are two industrial procedures that commonly involve the highly poisonous chemical compound cyanide. Sodium cyanide, potassium cyanide, hydrogen cyanide gas, potassium ferrocyanide, and ferricyanide salts are some of the different forms it can take.
Cyanide is a poisonous compound that is frequently used to extract gold and has a negative impact on the environment. In order to remove gold particles from ore, the very poisonous chemical cyanide is employed in the gold mining process. Despite its effectiveness, cyanide leaking can have negative impacts on the ecosystem and neighboring plants and animals. Animal and fish deaths as well as contaminated water sources have been connected to cyanide releases from mining operations.
In addition, chronic exposure to low concentrations of cyanide can harm human health and result in headaches, vertigo, and nausea. Despite the fact that many nations have laws governing the use of cyanide in gold mining, its widespread usage and a lack of effective management and containment techniques continue to raise concerns.
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Name a non metal which conducts electricity
Answers
Answer:
Graphite
Graphite is a non-metal and it is the only non-metal that can conduct electricity.
A very disorganized scientist has lost track of some data from a recent experiment and can no longer determine what element she was working with. Now, she refers to it as element X. She knows the element has a smaller atomic radius than strontium, a larger ionization energy than phosphorus, and a smaller electronegativity than chlorine. What is the likely identity of element X?
Answers
Answer :
The element X which ha a smaller atomic radius than strontium , a larger ionization energy than phosphorous , and a smaller elctronegativity than chlorine is Nitrogen
Explanation:
Here are some properties of Nitrogen-
Atomic number of Nitrogen is 7 Atomic mass of nitrogen is 14.0067 g.mol -1Nitrogen is a popular non-metal gas that is usually colourless, odourless, tasteless and often diatomic. In its outer shell, it has five electrons, but in most compounds, it is trivalent. Applications- In the manufacture of ammonia, the greatest single commercial use of nitrogen is as a part, subsequently used as fertilizer and to produce nitric acid. Liquid nitrogen (often referred to as LN2) is used as a refrigerant for the freezing and transport of food items, for the protection of bodies and for the reproduction of food products. Nitrogen is a constituent in all living tissues and comprises 78 percent of the Earth 's atmosphere. Nitrogen, since it is a component of DNA and, as such, is part of the genetic code, is an integral element of life.Hence , the X element is NITROGEN.
How many molecules are equal to 3.25 moles of carbon dioxide?
Answers
Answer:
1.957 × 10²⁴ moleculesExplanation:
The number of carbon dioxide molecules can be found by using the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 3.25 × 6.02 × 10²³
We have the final answer as
1.957 × 10²⁴ moleculesHope this helps you
3. If a gas has a pressure of 32.1 psi at a temperature of 25°C, then what is the new pressure if the temperature is increased to 75°C?
Answers
Answer: 37.485 psi
Explanation: using the gas law and assuming that volume is constant due to nor being stated we use the formula
P1/T1=P2/T2
Note that the tempreture should be changed from °C to K by adding 273
which element exists as a diatomic molecule in its most stable state?
Answers
The element that exists as a diatomic molecule in its most stable state is hydrogen (H).
In its most stable state, hydrogen exists as a diatomic molecule, meaning it naturally pairs up with another hydrogen atom to form H2. This is due to the electronic configuration of hydrogen, which consists of a single electron in its outermost shell. In order to achieve a more stable electron configuration, hydrogen shares its electron with another hydrogen atom, forming a covalent bond.
The formation of the H2 molecule involves the overlap of the two hydrogen 1s atomic orbitals to create a bonding molecular orbital. Each hydrogen atom contributes one electron to the bonding orbital, resulting in a stable H2 molecule with a filled bonding orbital.
The equation for the formation of the H2 molecule is as follows:
H + H → H2
Hydrogen (H) exists as a diatomic molecule, H2, in its most stable state. This diatomic form of hydrogen allows it to achieve a more stable electron configuration by sharing its single electron with another hydrogen atom through the formation of a covalent bond.
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Which of the following would be considered a derived unit? A) length B mass C) density D) temperature
Answers
Answer:
density because it S.I unit is derived from fundamentals
Write a balanced equation using the correct formulas and include conditions (s, l, g or aq) for the following reactions.
Liquid hexene (C6H12) burns in oxygen gas to form carbon dioxide gas and water vapor.
Answers
True or False: The Ring of Fire is a section along the Atlantic Ocean where you have active volcanoes
A. True
B. False
Answers
help please please help help help help help help help help!!!!!!!
how did chlorine atom attain saturation in potassium chloride and oxygen dichloride?
Answers
Answer:
because it was in the mixture
Explanation:
what compound has a molar mass of 37.11 g/mol
Answers
Answer:
Explanation:
The closest I can come to this is
Li C2H5 which would really be weird, but it comes to nearly 37.11. Everything depends on the periodic table you are using.
C2 = 2 * 12.011 = 24.022
H5 = 5 * 1.008 = 5.040
Li = 1 * 6.94 6.94
Total 36.002
You are going to mix a 1:10 bleach solution with water to make 500 mL of a 1:35 bleach solution. How much 1:10 bleach solution should you use?
(using the C1V1=C2V2 formula)
Answers
The volume of the bleach solution for 1:10 that should be used is 1,750 mL.
Volume of bleach solution requiredThe volume of bleach solution required is calculated using concentration formula as follows;
C1V1 = C2V2
where;
C1 is initial concentration of the bleach solutionV1 is the initial volume of the bleach solutionC2 is the final concentration of the bleach solutionV2 is the final volume of the bleach solutionMake the initial volume of the bleach solution the subject of the formula as shown below;
V1 = C2V2/C1
Substitute the given parameters and solve for the initial volume of the bleach solution.
V1 = (35 x 500)/(10)
V1 = 1,750 mL
Thus, the volume of the bleach solution for 1:10 that should be used is 1,750 mL.
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What affects the pressure of an object? *
Answers
NEED HELP ASAP!!!!!!!Instructions
Please complete the macromolecule chart using your notes and the PowerPoints. If you have trouble typing directly on the paper remember you probably need to download it first so it opens in a new window. Remember to save it with your name at the end so that I can tell whose paper it is. Than upload and submit. If you are having trouble, let me know.
Answers
Answer:
mouse
Explanation:
why is 2-chloro 2-methylbutane is more stable
Answers
The more stable secondary alkyl radical is easier to create, hence 2 chlorobutane is created quicker than 1 chlorobutane.
What is stability?Chemical stability in chemistry refers to a chemical system's thermodynamic stability.
When a system is in its lowest energy state or in chemical equilibrium with its surroundings, thermodynamic stability occurs.
In this case, the primary alkyl halide is 1-chlorobutane, while the secondary halide is 2-chlorobutane.
As a result, the SN1 reaction will occur in the 2-chlorobutane more quickly than the 1-chlorobutane.
Since it is simpler to produce the more stable secondary alkyl radical, 2 chlorobutane is produced more quickly than 1 chlorobutane.
Thus, 2-chloro 2-methylbutane is more stable.
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When butane burns completely, only water and carbon dioxide gas are produced. If 11.6 g of butane and 40.0 L of oxygen at 22.0o C and 102 kPa react, what volume of carbon dioxide gas also at 22.0o C and 102 kPa can be collected over water. The vapour pressure of water at 22.0o C is 2.24 kPa.
2C4H10(g) + 13O2(g) --> 10H2O(g) + 8CO2(g)
Answers
19.7 litre volume of carbon dioxide gas at 22.0o C and 102 kPa can be collected over water.
What is vapour pressure?Vapour pressure is a measure of the tendency of a material to change into the gaseous or vapour state, and it increases with temperature.
Moles of Butane = mass in grams / molar mass = 11.6 / 58.12 = 0.2
Volume of \(O_2\) (V) = 40 liter
Temperature (T) = 22°C = 22 + 273 = 295 K
Pressure (P) = 102 kPa = 102 / 101.325 = 1.007 atm
Moles of \(O_2\) (n) can be calculated by ideal gas equation.
PV = nRT
n = 1.007 40 ÷ 0.0821 295 = 1.663
Balanced chemical reaction;
2\(C_4H_10\) + 13\(O_2\) ---> 8\(CO_2\) + 10\(H_2O\)
From reaction;
13 moles \(O_2\) require 2 moles \(C_4H_10\)
So, 1.663 moles \(O_2\) will require = 2 x 1.663 ÷13 = 0.256 moles of \(C_4H_10\)
Thus \(C_4H_10\) is a limiting reagent. So it will drive the yield of \(CO_2\).
Moles of \(CO_2\) produced = (8/2) 0.2 = 0.8 moles
Pressure of \(CO_2\) (P) = 102 - 2.24 = 99.76 kPa = 99.76 ÷ 101.325 = 0.985 atm
Applying the ideal gas equation for \(CO_2\),
PV = nRT
0.985 V = 0.8 0.0821 x 295
V = 19.7 liter
The volume of \(CO_2\) produced = 19.7 liter.
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A gas system has an unknown pressure and an initial temperature of 299k. when the temperature is increased to 620 k the pressure is measured at 7.77 atm. the volume is constant throughout. what was the initial pressure in atm? a. 3.75 atm b. 41.31 atm c. 16.11 atm d. 118.27 atm
Answers
a. 3.75 atm
3.75 atm is the initial pressure.
Describe a gas system.a pressure vessel or transportable gas container attached to the system is not considered to be a part of the term "gas system," which refers to an assembly of tubes, pipes or similar ducts, fittings, and valves for the reticulation, circulation, and conveyance of a gas; Samples 1 and 2
What is the gas meter's typical pressure?Typically, 2 psi or 6 to 7" WC. The pressure after the second stage regulator in LP systems. This is typically 11" WC but might also be 2 psi.
High pressure gas has a PSI of what?2,200 psi to 2,600 psi is the typical range for high pressure cylinders. For certain uses, 3,000 psi and 6,000 psi cylinders are also offered. The majority of the sizes of carbon dioxide cylinders come with siphon choices.
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83.0 g Lithium Cyanide (LiCN)
Can someone please convert this to molar mass and moles for 100point?
it's not a scam like I really need this done before class is done
Answers
Molar mass:-
\(\\ \sf\longmapsto LiCN\)
\(\\ \sf\longmapsto 7u+12u+14u\)
\(\\ \sf\longmapsto 21u+12u\)
\(\\ \sf\longmapsto 33u\)
\(\\ \sf\longmapsto 33g/mol\)
Given mass=83gNo of moles=Given Mass/Molar mass
\(\\ \sf\longmapsto \dfrac{83}{33}\)
\(\\ \sf\longmapsto 2.5mol\)
PLEASE HELP A woman travels to Canada where milk is sold in liters. She wants to buy enough milk at the grocery store to last 5 days and she knows at home she uses 0.75 gallons per week. How many liters must she buy?
Answers
Answer:
About 2 liters
Explanation:
Since 1 gallon equals 3.785 liters, you figure out how many liters per week she uses by 3.785 x 0.75 which is 2.83875. Then divide that by 7 which is 0.405535 liters per day. Then multiply that by 5 days which is 2.027 liters in 5 days.
Electrons are subatomic particles that exist
Answers
what is the mass number of a carbon isotope with 10 neutrons
Answers
Answer:
16 because carbon atom having usual 6 neutron have a mass number of 12 and that with 7 neutron has mass number of 13
On the periodic table, carbon has an atomic number of 6 which indicates the amount of protons in the atom. Since atomic mass is the result of adding the amount of protons and neutrons in an atom together, we get that 6+10=16 and that 16 is the atomic mass.
NaOH (aq) + CuSO4(aq) →
balance the equation.
Answers
Give one example on each of the following [7 marks] 1. Short time scale change on ecosystem. 2. The law of unintended consequences... 3. Disposal sanitary method 4. Causes of Acid Rain. 5. Grcenhouse gases. 6. Effect of Ozone problem on Human. 7. Genetic Mutation causes.
Answers
1. Short time scale change on the ecosystem:
One example of a short time scale change on the ecosystem is the oil spill that occurred in the Gulf of Mexico in 2010. This disaster resulted in the contamination of the water, which ultimately led to the death of marine life and affected the food chain. The spill had a significant impact on the fishing industry in the region and took years to recover from.
2. The law of unintended consequences:
The law of unintended consequences states that actions always have consequences that are not anticipated. One example is the use of pesticides in farming. Although the use of pesticides reduces the risk of crop damage and increases yield, it also has unintended consequences. The pesticides can harm other organisms that come into contact with the crops, including bees and other beneficial insects that play a critical role in pollination.
3. Disposal sanitary method:
The disposal of waste is a significant problem in today's world, and sanitary landfill is a popular method of disposal. It involves the burial of waste in a landfill that is lined with materials that prevent leaching of harmful chemicals into the soil. This method of disposal is effective but has disadvantages. It produces greenhouse gases and requires large amounts of land.
4. Causes of Acid Rain:
The causes of acid rain include emissions from industrial activity, power generation, and transportation. These emissions release sulfur dioxide and nitrogen oxides, which react with the atmosphere to form acid rain. Acid rain has significant consequences for aquatic life and forests, as well as buildings and infrastructure.
5. Greenhouse gases:
Greenhouse gases are gases that trap heat in the atmosphere, causing the earth's temperature to rise. Examples include carbon dioxide, methane, and water vapor. Greenhouse gases are primarily produced by human activity, including transportation, industrial processes, and deforestation. The increase in greenhouse gas concentrations has resulted in climate change.
6. Effect of Ozone problem on Human:
The ozone layer is essential because it absorbs harmful UV rays from the sun. The depletion of the ozone layer due to human activity has resulted in an increase in skin cancer and other health problems. Exposure to UV radiation can also cause damage to the eyes and the immune system.
7. Genetic Mutation causes:
Genetic mutations can occur naturally or due to human activity, including exposure to radiation, chemicals, and toxins. Genetic mutations can cause health problems, including cancer and developmental disorders. Mutations can also have positive effects, such as improving immunity to certain diseases.
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What covalent bond(s) is/are the most important in forming pc from its 4 primary constituents?
Answers
The most important covalent bond in forming PC (phosphatidylcholine) from its primary constituents is the ester bond between the phosphate group and the glycerol backbone.
PC is a type of phospholipid composed of a glycerol backbone, two fatty acid chains, a phosphate group, and a choline molecule. The formation of PC involves several covalent bonds, but the most significant one is the ester bond between the phosphate group and the glycerol backbone.
The process of forming PC starts with the attachment of two fatty acid chains to the glycerol backbone through ester linkages. Then, a phosphate group, derived from phosphoric acid, is attached to the third hydroxyl group of the glycerol molecule. Finally, a choline molecule is linked to the phosphate group through a phosphoester bond.
The ester bond between the phosphate group and the glycerol backbone is crucial because it provides stability and structure to the phospholipid molecule. This bond determines the overall shape and properties of PC and is responsible for its amphiphilic nature, allowing it to form the lipid bilayers found in cell membranes.
While other covalent bonds, such as the ester bonds between the fatty acid chains and the glycerol backbone, are also important for the structure of PC, the ester bond between the phosphate group and the glycerol backbone plays a pivotal role in the formation and function of this phospholipid.
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Determine the relative formula mass of hexasodium difluoride using the periodic table below. A. 138 g/mol B. 176 g/mol C. 20 g/mol D. 42 g/mol
Answers
Answer:
Option B. 176g/mol
Explanation:
We'll begin by writing the chemical formula for hexasodium difluoride. This is given below:
Hexasodium means 6 sodium atom
Difluoride means 2 fluorine atom.
Therefore, the formula for hexasodium difluoride is Na6F2.
The relative formula mass of a compound is obtained by simply adding the atomic masses of the elements present in the compound.
Thus, the relative formula mass of hexasodium difluoride, Na6F2 can be obtained as follow:
Molar mass of Na = 23g/mol
Molar mass of F = 19g/mol
Relative formula mass Na6F2 = (23x6) + (19x2)
= 138 + 38
= 176g/mol
Therefore, the relative formula mass of hexasodium difluoride, Na6F2 is 176g/mol
Answer:
B. 176 g/mol
Explanation:
chemistry ed tell
what statement best describes a mole
a- it is use mainly for writing chemical formulas
b- it is used for chemical equations that have reversible reactions
c- it is used for direct comparing the amounts of substances
d- it is used mainly for dealing with fluid substances
Answers
c- it is used for directly comparing the amount of substance
Moles are the unit of measurement that estimates the amount of the substance in a sample. It directly compares the amounts of substances. Thus, option c is correct.
What are moles?Moles are said to be the SI unit to estimate the number of substances like atoms, molecules, ions, etc., in a sample. It is used to measure the elementary entities that are small in size.
It is abbreviated as mol and is equivalent to 6.02214076 × 10²³ particles (Avogadro number). It can be calculated by mass and the molar mass of the substance and is shown as,
Moles (n) = mass ÷ molar mass
Where mass is given in grams and molar mass in grams/ mol.
The moles are used to estimate the molarity and are also used in the ideal gas equation. The moles will be more in the substance with less molar mass and vice versa.
Therefore, option c. moles directly compares the amounts of substances.
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Which of the following statements best describes what will happen when white light hits a red object? hits a red object?
Question 3 options:
All wavelengths of the light are reflected.
Red wavelengths are reflected while all others are absorbed.
All wavelengths of the light are absorbed.
Red wavelengths are absorbed while all others are reflected.
Answers
Answer : red wavelengths are reflected whole all others are absorbed.
When white light hit a red colored object, all colors are absorbed and only red color is reflected. Hence, the object appears red in white light.
What is light reflection ?When a light ray hit a transparent or translucent object after hitting the surface the light ray will radiate back in a straight line and make the object's surface gleaming. This is called reflection.
The white light is a mix of all colors. White light absorbs all colors and reflect all colors as well and appears as white. Whereas, all other colors absorbs all colors but reflects only a particular wavelength and appear in the reflected color.
Red light is the longest wavelength among VIBGYOR. It absorbs all wavelengths but reflect only red light. Hence, it will appear in red in all light. Thus, option b is correct.
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Help me about it please
Answers
Answer:
4 atoms of Hydrogen
1 atom of Sulphur
4 atoms of Oxygen
hope it helps you
make me brainliest plz
if the acid dissociation constant, ka, for an acid ha is at 25°c, what percent of the acid is dissociated in a 0.50 m solution of ha at 25°c?
Answers
Approximately x% of the acid is dissociated in a 0.50 M solution of HA at 25°C.
What is the mathematical expression for the percent dissociation of an acid?The percent dissociation of an acid can be determined using the acid dissociation constant (Ka) and the initial concentration of the acid (HA). The mathematical expression for percent dissociation is:
Percent Dissociation = (Dissociated HA concentration / Initial HA concentration) * 100
In this case, we are given that the acid dissociation constant (Ka) for acid HA is known at 25°C, and we have a 0.50 M solution of HA. However, the value of Ka and specific acid are not provided, so we cannot calculate the exact percent dissociation.
To calculate the percent dissociation, you would need the value of Ka for the specific acid, which indicates the extent of dissociation at equilibrium. Based on this value and the initial concentration of HA, you can calculate the dissociated HA concentration and then use the mathematical expression mentioned above to determine the percent dissociation.
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Calcium carbonate decomposes in this balanced equation:
CaCO3 CaO + CO2 ΔH = +110 kJ/mol
Answers
The decomposition of calcium carbonate is an endothermic reaction.
The given equation for the decomposition of calcium carbonate is:
CaCO₃ → CaO + CO₂
ΔH = +110 kJ/mol
where ΔH is the enthalpy change for the reaction.
The positive value of ΔH in the equation indicates that the reaction is endothermic, meaning that heat is absorbed by the reactants from the surroundings during the reaction. This means that the reaction requires an input of energy to proceed, and the products (CaO and CO₂) have higher potential energy than the reactant (CaCO₃).
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--The complete question is, Calcium carbonate decomposes in this balanced equation:
CaCO3 + CaO + CO2 ΔH = +110 kJ/mol
Is this reaction endothermic or exothermic?--