The indicator phenolphthalein is added to the Analyte
The use of indicators in chemical reactionIndicators are chemical substances that are added to a chemical reaction which gives a visible sign usually by a colour change.
Examples of indicators are:
phenolphthalein Methyl orange andLitmusThe indicator phenolphthalein is usually added to an analyte which is the chemical constituents that are been measured.
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Why does a gas smell diffuse faster than a colour in a liquid?
Answer:
because there are other particles to help it move around in the air
1. You have 4.0 g of NaCl. Calculate the number of moles of
NaCl
Answer:
0.07mol
Explanation:
n=mass/molar mass
molar mass of NaCl=23+35.558.5g/moln=4/58.50.07mol3. Indicators are usually organic molecules with functional groups that will accept or donate
protons to the solution which will change the structure and make the solution change color. How
does the accuracy and precision of a pH measurement done with an indicator compare to that of
pH paper or a pH probe?
Combustion of an unknown compound containing only carbon and hydrogen produces 12.3 g of CO₂ and 3.8 g of H₂O. What is the empirical formula of the compound?
Answer:
C2H3
Explanation:
.
The empirical formula of the compound is C3H3.
What is an empirical formula?
In science, the exact equation of a synthetic compound is the most straightforward entire number proportion of particles present in a compound. A basic illustration of this idea is that the experimental recipe of sulfur monoxide, or somewhere in the vicinity, would just be Thus, similar to the observational recipe of di sulfur dioxide, S2O2.
In this manner, sulfur monoxide and di sulfur dioxide, the two mixtures of sulfur and oxygen, have a similar exact equation. Nonetheless, their sub-atomic equations, which express the quantity of iotas in every particle of a synthetic compound, are not something similar.
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The model here shows a process by which a hydra, an aquatic organism, produces a new offspring that is a clone of the original organism. If a student is explaining how the organism creates its own clone, which process would be included in the explanation? A) mitosis B) meiosis C) fertilization D) binary fission
The reproduction of hydra is through budding process from its body. This process of regeneration is called mitosis.Mitosis is a type of cell division process. Thus option A is correct.
What is mitosis?Mitosis is a cell division process in which one cell produces two identical daughter cells. The term mitosis means the duplication of the genetic material chromosomes with the exact gene information.
Different stages in mitosis together is called mitotic phases. Hydra is an invertebrate freshwater organism. Hydra has a translucent tubular body which can be elongated and contracted.
Hydra is classified to the phylum hydrozoa. It have a regeneratable head. The reproduction of hydra is through budding. A small bud first projects from its tubular body which then develops and emerges out by cell division.
The divided daughter hydra will grow as a matured hydra. This overall budding process takes places through mitosis. Hence, option A is correct.
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An enzyme-catalyzed reaction is run, and its Vmax and KM value are recorded. An inhibitor is added at a concentration of 0.675 mM. The value for KM did not change between the two reactions. However, Vmax decreased by 70%.
a. Where does this inhibitor bind to the enzyme? Briefly explain.
b. What is the value of Ki for the inhibited reaction?
We have that the value of Ki for the inhibited reaction
The place the enzyme inhibitor binds solely to the complicated fashioned between the enzyme and the substrate.KI = 3.551mMChemical Reactiona)
Generally, if the fee of Vmax binds, the place the enzyme inhibitor binds solely to the complicated fashioned between the enzyme and the substrate.
b) V diminished through 70%
Thereofore
Alternate = 1 - 0.7 = 0.3V
Hence
0.3 =1/ ( 1 + [I]/KI)
1= 0.3(1 + 0.657/KI )
0.3 + 0.1971KI = 1
KI = 3.551mM
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A WATER WAY CONTAINS 10.3 MILIGRAMS OF IMPURITY PER GALLON OF WATER.HOW MANY MICROGRAMS OF IMPURITY ARE PRESENT PER LITER OF WATER.
1 MG= 1000 MICROGRAMS
1 GAL=3.79 LITERS
I Gallon = 3.785 L 1 Mg = 1 mg gallon 3.785L. 3. The recommended adult dose of Elixophyllin®, a drug used to treat asthma, is 6.00 mg/kg of body mass. Calculate the dose in milligrams for a 112 lb person. (o oo Kg | K9 6.oong 112 15 = 3 04.7 - 3 2.20515 2.20516 my k.
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Which location in the image below represents the OLDEST rocks?
A and C are the only two places that would represent the oldest rocks
Describe how the flow of water changes the temperature at the beach ?
Answer: Ocean currents act as conveyer belts of warm and cold water, sending heat toward the polar regions and helping tropical areas cool off
Explanation: Hope this helps? Brainliest if it helped
Emi wants to see if she can melt a marshmallow in the sun. She plans to put the marshmallow in a container that will cause it to heat up quickly. In one or two sentences, describe what type of container and materials Emi should use.
I GIVE BRAINLY IF ANSWEREDD CORRECT
Answer:
emi should put it in a metal container and place directly to the sun emi should place two mirrors opposite it and that will increase the heat which will melt the Marsh mallow
In one or two sentences, explain why the combined weight of several liquids mixed in an open flask can be less than but never more than the sum of all the weights of the ingredients.
Answer:
The combined weights of several liquids mixed in an open flask be less than the sum of all the weights of the liquids because when the reaction occurs new products are formed and also some gases which releases in the atmosphere.
What does it mean that something is a conservative ion?
Answer:
The major ionic constituents whose concentrations can be determined from the salinity are known as conservative substances. Their constant relative concentrations are due to the large amounts of these species in the oceans in comparison t
Determine the molar mass of (show your work) :
FeCl3•6H2O (note, this is all 1 molecule. Its an FeCl3 with a cage of 6H2O’s attached. These molecules are known as hydrates.)
Ca3(PO4)2
How would an asthma attack most likely affect oxygen delivery in the body?
Answer: During an asthma attack, you aren't getting enough oxygen into your lungs. This means less oxygen is getting into your blood and into your muscles. Without oxygen, fatigue sets in.
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How much H is need to react with 6.58 g of O, in this reaction?
H2 + O2 -> H2O
Answer:
Balance the equation first
[tex]2H_{2} \ + \ O_{2} \ --> \ 2H_{2}O[/tex]
6.58g of Oxygen gas
Divide 6.58g by molar mass of oxygen (32g/mol)
6.58/32 = 0.205625 mol
Use mol to mol ratio from looking at the coefficients of the reactants, the mol ratio of Hydrogen gas to Oxygen gas is 2:1, so for every 1 mol of Oxygen, you need 2 times the mol of hydrogen for it to make water.
0.205625 * 2 = 0.41125 mol
To get the mass of hydrogen gas needed in the reaction, turn 0.41125 mol into mass by multiplying it with Hydrogen gas's molar mass, which is 2.02 g/mol.
0.41125 * 2.02 ≈ 0.83g of H2
The Lewis structure below represents the compound ___________________.
Group of answer choices
dioxygen carbide
carbon tetraoxide
carbon dioxide
carbon monoxide
Answer:
Carbon Dioxide
Explanation:
This is a covalent compound so to name it you have one carbon, no prefix needed, & 2 oxygen the prefix for 2 is Di-.
Why NH2 is a bad leaving Group?
Explanation:
Consider that strong bases are strong nucleophiles, and thus unstable with the negative charge associated with dissociation from the molecule. Hence, strong bases are generally very poor leaving groups, but can be converted into good leaving groups that are more stable with the associated negative charge.
What pressure is requred to contain 0.023 moles of nitrogen gas in a 4.2 L container at a
temperature of 20.°C?
Answer:
0.13 atm
Explanation:
Using the Ideal Gas Law; PV=nRT, we can rearrange to solve for pressure.
P=nRT/V
P is pressure, n is number of moles (0.023), R is a constant (0.08206 L*atm/mol*K), T is temperature in Kelvin (293.15K) and V is volume, 4.2 L.
So, plugging in;
P=(0.023mol)(0.08206L*atm/mol*K)(293.15K)/(4.2 L)
P=0.1317 atm
P=0.13 atm; multiply by 760 to get to Torr or mmHg.
What determines how much something will change temperature?
Answer:
The heat Q transferred to cause a temperature change depends on the magnitude of the temperature change, the mass of the system, and the substance and phase involved. (a) The amount of heat transferred is directly proportional to the temperature change.
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g A student performs an experiment where gas is collected over water in an upside down graduated cylinder. If the atmospheric pressure is 739 mmHg and the level of water in the graduated cylinder is 11 cm higher than the level of the water exposed to the atmosphere, what is the total pressure of gases inside the graduated cylinder
The total pressure of gases is equivalent to 739mmH divided by the area.
How to calculate the total pressure of gases?To calculate the total pressure of gases, the next formula can be used:
Total pressure: Force/areaTotal pressure 739 mmH/areaHow to calculate the area?The area of a cylinder is equal to 2πrh+2πr².
You can know the radio by checking the measurement of the base of the graduated cylinder. Also, you can determine the height by observing how many mm the gas is occupying. Then follow these steps:
Find out the area based on the formula provided.Replace the area in the pressure formula.Solve the formula.Note: This question is incomplete because the height occupied by the gas and the radio of the cylinder are not provided. Due to this, I answered this question based on general knowledge.
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How many hydrogen atoms are there in 2.25 moles of H2CO3?
Answer:
4.5moles
Explanation:
2.25moles times 2 hydrogen atoms per one molecule
The number of hydrogen atoms present in 2.25 moles of hydrogen carbonate is 4.5.
What is a mole?
A mole of a compound is equivalent to the one formula unit of the compound. The number of atoms of each element in a mole of the compound can be given from the formula unit.
1 unit of hydrogen carbonate consists of 2 atoms of hydrogen. Thus, 1 mole of hydrogen carbonate has 2 hydrogen atoms.
The number of hydrogen atoms in 2.25 mole of hydrogen carbonate can be given as:
[tex]\rm 1\;mol\;H_2CO_3=2\;atoms\;Hydrogen\\2.25\;mol\;H_2CO_3=2.25\;\times\;2\;atoms\;of\;hydrogen\\2.25\;mol\;H_2CO_3=4.5\;atoms \;of\;Hydrogen[/tex]
The number of hydrogen atoms present in 2.25 moles of hydrogen carbonate is 4.5.
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Find the percent composition of water in barium chloride dihydrate. Round your answer to the
nearest whole number.
A)17%
B)8%
C)85.3%
The percent composition of water will be 15%
Percent compositionThe percent composition of a component of a compound is found by dividing the mass of the component by the mass of the compound.
In other words:
Percent composition = mass of component/mass of substance x 100
In this case, the formula for barium chloride dihydrate is [tex]BaCl_2.H_4O_2[/tex]
The molar mass of the compound is 244.26 g/mol
The molar mass of the water component is 18 x 2 = 36 g/mol
Thus, the percent composition of water in the compound can be found, such that:
Percent composition of water = 36/244.26 x 100
= 15% to the nearest whole number.
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How many atoms of magnesium metal are needed to produce 3.87 moles of magnesium oxide
(Mgo)?
2Mg(s) + O2(g) —> 2MgO (s)
What was the mass of the Mg that the students began with?
Answer:
48.42g of Mg
Explanation:
Answer:
they other guys is ri gh gt
How do you separate and collect salt and water after a neutralisation reaction?
Answer:
First filter the the un-soluble solute out of the solution
Then get the solute and put it on an evaporating dish to form salt crystals
Explanation:
i am giving Branly to the fastest and best answer
Davy made a model of the water cycle by adding some water inside a plastic bag, sealing the bag, and placing it in a sunny area. He noticed that the level of the water went down, and then some droplets appeared on the sides of the bag. Which part of the water cycle caused water droplets to form on the side of the plastic bag?
Condensation
Evaporation
Precipitation
Runoff
Answer:
precipitation
Explanation:
Someone can help me please??
Answer:
c-d
Explanation:
this is a section of the graph sloping down, meaning the state of matter isn't changing but is getting ready too (the actually changing of states happens in the flat sections). A-B is the gas cooling, b-c is the gas changing into liquid, which leads to the liquid cooling in the next section
Write 1/5 as an equivalent fraction with 500 in the denominator?
I need help please
Answer:
100 / 500
Explanation:
100 / 500 is equivalent to 1 / 5.
what happens inside a can of solid food as gas is produced
Answer:
Bacteria or mold grows in the can giving of the gasses and producing byproducts that may be harmful or dangerous to ingest (eat).
Explanation:
In this system, ___________________ energy from the cyclist is converted to a lot of ___________________ energy and a little bit of ___________________ energy. The ___________________ energy from the turning bicycle wheel spins the turbine which generates ___________________ energy. The fluorescent light bulb converts this energy into two new forms: a lot of ___________________ energy and very little ___________________ energy.
Switch out the fluorescent bulb (curly one) with the incandescent bulb (rounded) and observe the energy output.
Energy can be converted from one form to another.
What is energy transformation?The question is incomplete as the system is not shown but I will try to help you the much I can. First of all, this question deals with the idea of energy transformation. We must note that energy is neither created nor destroyed but can be transformed from one form to another.
The system ought to have been composed of many systems in which energy transformations occur ad each of these must obey the law stated above. These energy transformation are not 100% efficient as some energy is lost as heat along the way
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