Answer:
i think its c because thats when the direction changes and you dont know where he went.
Explanation:
The specific heat capacity of liquid ethanol is 2.42 J/gºC.
How many joules of heat must be absorbed by 0.463 g ethanol to change its temperature from 51.6 °C to 82.4 °C?
Show work to receive credit.
Why must the spot applied to a TLC plate be above the level of the developing solvent? What problem will ensue if the level of the developing liquid is higher than the applied spot in a TLC analysis?
Answer:
See explanation
Explanation:
If the spot in TLC is below the solvent front, it will be observed that the spot, instead of being separated by the solvent as expected, will just dissolve away in the solvent and zero actual separation of the mixture is achieved.
If the solute is dissolved away instead of being separated by the solvent, then the experiment fails because no actual separation of the mixture is achieved.
Hence, in TLC, the spot must be applied above the solvent front so that the capillary movement of the solvent through the plate can lead to the eventual separation of the components of the mixture since the various components of the mixture will travel at different speeds through the plate.
Also, if the solvent is above the spot, the solvent may evaporate selectively from the points above the spot while separation is ongoing.
please answer this chemistry question
Answer:
Answer will be A
Explanation:
PLS MARK BRAINLIEST
12. NAD and NADPH are distinguished from each other by the
that's bonded to the sugar ring attached to the adenine.
O A. phosphate group
O B. adenine
O C. carbon dioxide
O D. nicotinamide
Answer:
A. phosphate group
Explanation:
I got it right in class!
Hope this Helps!! :))
Atoms are found to move from one lattice position to another at the rate of 300,000 jumps/s at 500 0C when the activation energy for their movement is 10,000 cal/mol. Calculate the jump rate at 400 0C.
Answer:
1
Explanation:
1
Why all mushrooms cannot be eaten?
Explanation:
The toxins present are secondary metabolites produced by the fungus. Mushroom poisoning is usually the result of ingestion of wild mushrooms after misidentification of a toxic mushroom as an edible species. ... The safety of eating wild mushrooms may depend on methods of preparation for cooking.
A student carries out a flame test on an unknown solid. a red flame is seen. the student concludes that the solid is lithium carbonate. explain why this conclusion is not justified
4-chloroaniline, benzoic acid and 1,4-dibromobenzene. Prepare a flow chart to illustrate the process of separation for each component.
Answer:
The flow chart is found in the attachment
Explanation:
The mixture of 4-chloroaniline, benzoic acid and 1,4-dibromobenzene is separated based on their different solubility properties.
4-nitroaniline is basic and is first extracted using an acid, hydrochloric acid.
Benzoic acid is an acid, hence is extracted using a base, using either sodium hydrogen carbonate or sodium hydroxide.
1,4-dibromobenzene is neutral and is extracted from an organic solvent by evaporation using its property of solubility in an organic solvent.
In the flow chart illustrating the separation process, first the mixture of organic compounds is dissolved in ether, an organic solvent and then placed in a s eparatory funnel.
Then, the basic amine compound, 4-chloroaniline is removed from the organic layer into an aqueous layer by adding an inorganic acid, HCl. The aqueous lower layer is drained into a conical flask. The 4-chloroaniline is then precipitated out of solution by adding concentrated NaOH dropwise.
The organic acidic, benzoic acid is then extracted from the organic layer by adding an inorganic base, sodium hydrogen carbonate. The lower aqueous layer is drained into another flask. Benzoic acid is then precipitated out of solution by adding a concentrated solution of HCL.
The neutral 1,4-dibromobenzene is then obtained by evaporation of the organic solvent
I need help please ASAP
what flora eat? pliz tell me someone
Answer:
flora eat food
Explanation:
because that what every living thing eats to grow.
Answer:
sugar??
Explanation:
plants photosynthesise to make their own food (mainly glucose) to be transported around the plant
A substance with two oxygen atoms is combined with a substance with one oxygen atom to form one product. What is true of the product?
There will be no oxygen in the product. Some of the oxygen will evaporate into the air.
*Asap*
a) what is the rate equation?
b) what are the units of the rate constant?
c) what would happen to rate if the temperature was increased?
Answer:
(a).
[tex]order \: of \: A = 2 \\ order \: of \:B = 0 \\ rate = k[A] {}^{2} [B][/tex]
(b)
[tex]0.32 \times {10}^{ - 3} = k {(0.12)}^{2} (0.15) \\ k = 0.148 \: {mol}^{ - 2} {dm}^{6} {s}^{ - 1} [/tex]
(c). The rate increases because kinetic energy of reactant molecules increases.
what is thermodynamics ???
don't explain .-. !!!
Answer:
the scientific study of the relations between heat and other forms of energy
Please answer .
Which answer choice is correct ?
There are four options.
Answer:
I also think NaOH is the answer since they are all strong electrolytes and NaOH has the highest number
20ml of water is mixed with 40gm of fine powder. Calculate the concentration of the solution obtained.
Answer:
[tex]\%m=66.7\%[/tex]
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to calculate the concentration of the solution obtained, by knowing 20 mL of water are the same to 20 g and therefore the mass of the solution is 40g+20g=60g.
Next, we apply the following equation to obtain the required concentration:
[tex]\%m=\frac{40g}{60g} *100\%\\\\\%m=66.7\%[/tex]
Regards!
Atoms are neutral because the number of
Answer:
electrons and protons
Explanation:
Literally search it up
(a) Describe the process by which Nitrogen is obtained from air on a large scale
The element nitrogen exists as a gas and is obtained from air on a large scale by fractional distillation of air.
What is an element?An element is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.
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Please help me ASAP
Which of the following pairs of atoms is most likely to form an ionic bond?
lithium and sodium
sodium and neon
sulfur and oxygen
lithium and sulfur
Answer:
lithium and sulfur
Explanation:
An ionic bond is formed between a metal, which loses electrons to form a cation, and a non-metal, which gains electrons to form an anion.
Which of the following pairs of atoms is most likely to form an ionic bond?
lithium and sodium. NO. Both are metals. sodium and neon. NO. Sodium is metal and neon is a noble gas. sulfur and oxygen. NO. Both are non-metals. lithium and sulfur. YES. Lithium is metal and sulfur non-metal.cuáles son las características de la luz y en qué consisten
Answer:
Cuáles son las características de la luz y en qué consisten?
Explanation:
La luz es una radiación que se propaga en forma de ondas. Las ondas que se pueden propagar en el vacío se llaman ONDAS ELECTROMAGNÉTICAS. La luz es una radiación electromagnética
Which rock type is most likely to compsoed of just one mineral?
rock salt
conglomerate
basalt
rhyolite
maybe is answer is rhyolite
Answer:
the answer is rhyolite.
Explanation:
i'm pretty sure it is my guy
In the presence of excess iodide ions, the iodine formed by reaction of iodide with NBS will react further to form triiodide ions. What does the triiodide combine with to form the blue color of the endpoint
Answer:
Starch.
Explanation:
When the triiodide combine with starch, it forms dark blue colour. Amylose in starch is responsible for the occurrence of a deep blue color when the iodine is combine with the starch. The iodine molecule goes inside of the amylose coil which makes a linear triiodide ion complex that goes into the coil of the starch that leads to an intense blue-black color in the end so we can say that starch turns the colour into blue.
140 g of KCl is dissolved in 600 mL of water. What is the molarity?
Answer:
[tex]\boxed {\boxed {\sf molarity \approx 3 \ M \ KCl}}[/tex]
Explanation:
Molarity is a measure of concentration in moles per liter. The formula is:
[tex]molarity= \frac{moles \ of \ solute}{liters \ of \ solution}[/tex]
We are given grams of solute and liters of solution, so we must convert both before calculating molarity.
1. Convert Grams to MolesWe convert grams to moles using the molar mass. This value is found on the Periodic Table. It is the same as the atomic mass, but the units are grams per mole (g/mol) instead of atomic mass units (amu).
We have the compound KCl, so we look up the molar masses of the individual elements.
Potassium (K): 39.098 g/mol Chlorine (Cl): 35.45 g/molThe compound does not contain subscripts, so we can add the molar masses together to find the molar mass of the compound.
Potassium chloride (KCl): 39.098+ 35.45= 74.548 g/molUse the molar mass as a ratio.
[tex]\frac {74.548 \ g\ KCl}{1 \ mol \ KCl}[/tex]
Multiply by 140 grams of KCl.
[tex]140 \ g\ KCl*\frac {74.548 \ g\ KCl}{1 \ mol \ KCl}[/tex]
Flip the ratio so the units of grams of KCl cancel.
[tex]140 \ g\ KCl*\frac{1 \ mol \ KCl} {74.548 \ g\ KCl}[/tex]
[tex]140 *\frac{1 \ mol \ KCl} {74.548 }[/tex]
[tex]1.877984654 \ mol \ KCl[/tex]
2. Convert Milliliters to Liters1 liter contains 1000 milliliters. Create another ratio.
[tex]\frac{ 1 \ L}{1000 \ mL}[/tex]
Multiply by 600 milliliters (the value we are converting).
[tex]600 \ mL *\frac{ 1 \ L}{1000 \ mL}[/tex]
The units of milliliters cancel.
[tex]600 \ *\frac{ 1 \ L}{1000 }[/tex]
[tex]0.6 \ L[/tex]
3. Calculate MolarityNow we know the moles of solute and the liters of solution.
1.877984654 mol KCl and 0.6 LSubstitute the values into the molarity formula.
[tex]molarity= \frac {1.877984654 \ mol \ KCl}{0.6 \ L}[/tex]
[tex]molarity= 3.129974424 \ mol \ KCl/L[/tex]
The original measurements of grams and milliliters have 2 and 1 significant figures. We must round our answer to the least number of sig figs: 1.
For the number we found, that is the ones place. The 1 in the tenths place tells us to leave the 3 in the ones place.
[tex]molarity \approx 3 \ mol \ KCl/L[/tex]
1 mole per liter is equal to 1 molar or M. Convert the units.
[tex]molarity \approx 3 \ M \ KCl[/tex]
The molarity is approximately 3 M KCl.
What volume would 0.853 moles of Nitrogen gas occupy at STP?
Answer:
19.12 L
Explanation:
At STP(i.e. Standard temperature and pressure).
The volume occupied by one mole of gas = 22.4 L
The pressure = 1 atm
The temperature = 273 K
Thus, since 1 mole of gas = 22.4 L;
Then 0.853 moles of N2 gas will occupy:
= (0.853 moles of N2 gas × 22.4 L)/ 1 mole of N2 gas
= 19.12 L
1. You find a separatory funnel set up in a fume hood. There are clearly two visible layers. Describe a method you could use to determine which layer is the aqueous layer.
Answer:
You find a separatory funnel set up in a fume hood. There are clearly two visible layers. Describe a method you could use to determine which layer is the aqueous layer.
Explanation:
In the separating funnel, the liquid with less density exists at the top layer and the liquid with greater density will exist at the bottom layer.
To identify the aqueous layer, add a bit of water to the separating funnel.
Then, observe where the water will go and mix.
If it mixes with the bottom layer, then the bottom layer is the aqueous layer.
If water mixes with the top layer, then top layer is the aqueous layer.
A method we could use to determine which layer is the aqueous layer is by adding 2-4 drops of water in the separatory funnel.
Explanation:
A separatory funnel is a glass apparatus used in labs to separate two immiscible liquids from each other.The two liquids will be present distinctly in form of two different layers one on the other.The liquid at the bottom is with higher density in comparison to the liquid layer at the top which is with lower density.It is mainly used to separate the layer of organic compounds from the aqueous layer.One way to determine the aqueous layer in the separatory funnel is to add 2-4 drops of water to the separatory funnel and observe in which layer the water drops get invisible that is mixed up.The layer in which water drop mixes will experience a small increase in its volume and that will be the aqueous layer.Water drops will not mix with the organic layer can be easily observed with eyes.So, from this, we can conclude that a method we could use to determine which layer is the aqueous layer is by adding 2-4 drops of water in the separatory funnel.
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What term describes the process of lowering the boiling point of a hydrocarbon by exposing it to different environmental treatments such as hydrogen enriched catalysts or high temperatures
Answer:
Cracking.
Explanation:
A chemical reaction can be defined as a reaction in which two or more atoms of a chemical element react to form a chemical compound. An example of a chemical reaction involving hydrocarbons is cracking.
Hydrocarbon can be defined as an organic compound that comprises of hydrogen and carbon only.
In Organic chemistry, cracking refers to the process of lowering the boiling point of a heavy, complex or long-chain hydrocarbon such as kerogens by exposing it to different environmental treatments such as hydrogen enriched catalysts, pressure or high temperatures, in order to produce smaller, lighter and more useful molecules (alkanes and alkenes) such as gasoline, diesel fuel, etc.
Of course, most of us know the reaction between Coca Cola and Mentos. So please can someone provide a chemical equation which contains the ingredients in Coca Cola and Mentos that will make it to foam?
Answer:
As the Mentos candy sinks in the bottle, the candy causes the production of more and more carbon dioxide bubbles, and the rising bubbles react with carbon dioxide that is still dissolved in the soda to cause more carbon dioxide to be freed and create even more bubbles, resulting in the eruption
12. Which formula shows a substance that is not molecular?
H₂
H2O
н
CO2
Answer:
the answer is H ..............
At a fixed volume, a four-fold increase in the temperature of a gas will lead to _______ in pressure.
Question 2 options:
A)
no change
B)
a two-fold decrease
C)
a four-fold decrease
D)
a four-fold increase
Answer:
D) a four-fold increase
Explanation:
According to Gay-Lussac's law, which states that the pressure of a given amount of gas is directly proportional to the temperature at a constant volume, the pressure increases with an increase in temperature.
According to this question, at a fixed volume, a four-fold increase in the temperature of a gas will lead to a four-fold increase in the pressure as well.
(a) Calculate the pH of a buffer that is 0.12 M in lactic acid and 0.11 M in sodium lactate. (b) Calculate the pH of a buffer formed by mixing 85 mL of 0.13 M lactic acid with 95 mL of 0.15 M sodium lactate.
Answer:
fe9ufeohdwbkdwsdjvdwihdwkbfw
Match the following parts of an atom to their description.
Neutron
?
Negatively charged
particle that moves
around the nucleus
Nucleus
?
Positively charged particle
in the nucleus
Electron
2
Noncharged particle in the
nucleus
Proton
?
Composed of protons and
neutrons
Answer:
Neutron - non charged particle in nucleus
nucleus - composed of proton and Neutron
electron - negatively charged particle that moves around the nucleus
proton - positively charged particle in the nucleus.
Explanation:
these the are definitions of the terms