Answer:
b)
Explanation:
[tex]pH = - log[H {}^{ + } ] \\ 2.36 = - log[H {}^{ + } ] \\ [H {}^{ + } ] = {10}^{ - 2.36} \\ [H {}^{ + } ] = 4.37 \times {10}^{ - 3} \: M[/tex]
my chem test is tomorrow!! please help
Answer:
The pH of the pure water is not always neutral but actually sometimes it can be slightly acidic but not of the same extent or value as HCl obviously. However ,it is enough to result to a color change in the presence of phenolphthalein.
Explanation:
I will try to be brief and spare the boring details .Basically ,this is caused by the reaction of water and CO2 that is naturally present in the atmosphere to produce a weak acid known as carbonic acid.
~Hope this helps:)
Which of the following has the greatest effect on colligative properties?
A. Calcium chloride (CaCl2)
B. Aluminum Nitrate (Al(NO3)3)
C. Epsom salt (MgSO4)
D. Sodium chloride (NaCl)
Can someone help me please? I’d appreciate it! Also please do not send me a link or delete your answer! Thanks
The piston of an internal combustion engine
compresses 218 mL of gas. The final pressure
is 15 times greater than the initial pressure.
What is the final volume of the gas, assuming
constant temperature?
Answer in units of mL.
Answer:
14.53ML
Explanation:
V1=218
V2=?
P2=15p1
USING BOYLE'S LAW
P1V1=P2V2
V2=P1V1/P2=P1(218ML)/15P1
=14.53ML
HELP ASAP PLEASE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
a. alkali
b. chemical
c. reactants
d. neutralised, acid
e. neutralisation
f. products
Explanation:
hope this helps and sorry if it is not right :)
Answer:
a). It is an ----Alkali.
b). ---a chemical reaction takes place.
c).----are the reactants in the reaction.
d).----the alkali has neutralized the acid.
e). --- is called a neutralization
f).---- of the products of the reaction is a salt.
What element is produced when Mercury - 204 undergoes alpha decay?
Answer:
bismuth
Explanation:
i think if not i am so sorry
Which of the following is a correct statement about water? (3 points)
Hydrogen bonding causes water to be strongly cohesive.
Hydrogen bonding causes water to have a low surface tension.
Water is a universal solvent because polar and nonpolar solutes can dissolve in it.
Water is less dense as a liquid than as a solid because of changes in bond structure.
Answer:
A: Hydrogen bonding causes water to be strongly cohesive.
Explanation:
Water has a high surafce tension. Hence droplets of water
Water cannot dissolve non polar substances like oil; only polar
Water is actually less dense in solid form :)
Hydrogen bonding causes water to be strongly cohesive.
This sticking together of like substances is called cohesion. Depending on how attracted molecules of the same substance are to one another, the substance will be more or less cohesive. Hydrogen bonds cause water to be exceptionally attracted to each other. Therefore, water is very cohesive.
Cohesion
Cohesion, also called cohesive attraction or cohesive force, is the action or property of like molecules sticking together, being mutually attractive. It is an intrinsic property of a substance that is caused by the shape and structure of its molecules, which makes the distribution of surrounding electrons irregular when molecules get close to one another, creating an electrical attraction that can maintain a microscopic structure such as a water drop. In other words, cohesion allows for surface tension, creating a "solid-like" state upon which light-weight or low-density materials can be placed.
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Sodium chloride is produced from its elements through a synthesis reaction. What mass of each reactant would be required to produce 22.0 mol of sodium chloride? sodium
Answer:
506.0 g sodium and 778.8 g chlorine gas
Explanation:
The elements from which sodium chloride (NaCl) is composed are sodium (Na) and chlorine (Cl). Thus, the chemical equation for the production of sodium chloride (NaCl) from sodium (Na) and chlorine gas (Cl₂) is the following:
2Na(s) + Cl₂(g) → 2NaCl(s)
According to the balanced equation, 2 moles of NaCl are produced from 2 moles of Na(s) and 1 mol of Cl₂. To produce 22.0 mol of NaCl, we need:
22.0 mol NaCl x 2 mol Na(s)/2 mol NaCl = 22.0 mol Na(s)
22.0 mol NaCl x 1 mol Cl₂/2 mol NaCl = 11.0 mol Cl₂
Now, we convert the moles of each reactant to grams with the molar mass (MM) of the compound:
MM(Na) = 23 g/mol
22.0 mol Na x 23 g/mol = 506.0 g Na(s)
MM(Cl₂) = 35.4 g/mol x 2 = 70.8 g/mol
11.0 mol Cl₂ x 70.8 g/mol = 778.8 g Cl₂
Therefore, it is required a mass of 506.0 grams of Na(s) and a mass of 778.8 grams of Cl₂ to produce 22.0 mol of NaCl.
What is the hottest place on the planet?
Answer:
Death Valley in California U.S. is the hottest place in the world
16. The passage of salts into and out of cells is most
closely associated with the life process of
A. transport
B. respiration
C. reproduction
D. digestion
Answer:
A. transport
Explanation:
yan po sana makatulong
Can u please help me
Answer:
they are all true
Explanation:
HELP ME PLEASE
IM LITERALLY FAILING
Which of the following is not a component of cell theory?
a. Cells can be generated by element condensation in water vapor.
b. All organisms are made of one or more cells.
c. Cells are basic building blocks of all life.
d. Cells must come from pre-existing cells.
Answer:
A
Explanation:
Definitely not in the cell theory
If a piece of pure gold jewelers weighs 11.81 grams, how many atoms is it made of?
Answer:30.573 Billion atoms are in one gram
Explanation:
HI! I REALLY NEED HELP WITH THIS, THANK YOU!
ig The right answer is -Give the reaction more time.
Which component of a river system is made of streams and small rivers that feed into a large river? Which component of a river system is also called a drainage basin? Which component of a river system is a ridge between water flowing in two directions?
Explanation: A river drainage basin is an area drained by a river and all of its tributaries. A river basin is made up of many different watersheds. A watershed is a small version of a river basin. Every stream and tributary has its own watershed, which drains to a larger stream or wetland.
The component of a river system is made of stream and small rivers that feed into a large river is tributaries. The component of a river system also called a drainage system is watersheds. The component of a river system is a ridge between water flowing in two directions is divided.
What are tributaries and watersheds?
Tributaries are the small rivers or streams that are made from the big or main river.
Watershed is the place where the rainwater from all river lines come to a point.
Thus, the correct options are tributaries, watersheds, and divided.
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24) The charge on the ion is -3
A) nitride
B) sulfate
C) permanganate
D) acetate
E) oxide
Answer:
hbhwehwfhfg
Explanation:
Use an example of how we use an informal kind of scientific method in our everyday lives
Answer:
baking cookies
Explanation:
One example of using a scientific method is baking cookies. You make a hypothesis that you cookies will be done in 15 minutes. Then, after 15 minutes, you see that either your hypothesis was correct and you cookies are perfect or you need to bake them longer making you hypothesis incorrect. (please change the wording up a bit if you want. i tried to make it make the most sense)
Answer:
Explanation:
When you loose your phone. You try to remember where you last used your phone, and question yourself where you might have left it. If you say that you probably left it in the kitchen, that would be like your hypothesis. Then you go look for it where you thought you left it which would be your experiment. If maybe it is not there that would be like your conclusion so you would reject your hypothesis because it was wrong. Then you try the scientific method again but with a different hypothesis, like that maybe you left it in the living room. You do your experiment which is when you go look for it. In the conclusion if your hypothesis was right you accept your hypothesis. That can be an example of how we use the scientific method in our everyday lives.
Which two geographic features form as a result of continental-continetal convergent
plates?
Answer:
Deep ocean trenches, volcanoes, island arcs, submarine mountain ranges, and fault lines are examples of features that can form along plate tectonic boundaries. Volcanoes are one kind of feature that forms along convergent plate boundaries, where two tectonic plates collide and one moves beneath the other.
Explanation:
I hope it's help u
Please brainiest
Which planet would make the closest approach to Earth as the planet orbits the sun?
Planet
Distance from the Sun in AU
Mercury
0.387
Venus
0.723
Earth
1
Mars
1.52
Jupiter
5.20
Saturn
9.54
Uranus
19.2
Neptune
30.1
A. Mercury
B. Jupiter
C. Venus
D. Mars
Answer:
D
Explanation:
Mars is nearest to Earth
Among the given planets, Mercury would make the closest approach to Earth as it orbits the Sun. This is because Mercury has the smallest average distance from the Sun, with a value of 0.387 astronomical units (AU).
The distances of the planets from the Sun are measured in astronomical units, where 1 AU is the average distance between the Earth and the Sun. With a distance of 0.387 AU, Mercury's orbit is closer to the Sun compared to the other planets listed.
As Mercury orbits the Sun, its path occasionally brings it closer to Earth when both planets align in their respective orbits. This phenomenon is known as a close approach or inferior conjunction. During this alignment, Mercury appears closer to Earth in the night sky, making it the planet that would make the closest approach to Earth among the given options.
Hence, the correct option is option A.
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A piece of metal weighing 59.047 g was heated to 85.2°C and then put into 100.000 g of
water at 23.7°C. The metal and water were allowed to come to an equilibrium
temperature of 24.8°C. Calculate specific heat of the metal. Show work please.
PLZ HELP... provide the correct coefficients to balance the chemical equation C2H6+O2 -> CO2 + H20
Explain the method to decrease friction?
Answer:
having a smooth or lubricated surface may help decrease friction.
Explanation:
2. How did the Activator affect the mixture?
Answer:
Activator effects a mixture if you put to much of the activator your using into a product or thing you are using.
Explanation:
For ex.
If you poor to much activator into slime it will make the slime hard and very wet it will ruin your slime completely so you will have to do it just right but start off pouring it slowly and mix and then more if it needs more.
0.444 mol C2H5OH= how many molecules
Explanation:
hope it make sense to u :)
Does the excess reactant get used up completely in a reaction??
Answer:
In a chemical reaction, reactants that are not used up when the reaction is finished are called excess reagents. The reagent that is completely used up or reacted is called the limiting reagent, because its quantity limits the amount of products formed.
Explanation:
11. Which do you think is more important in forming personality---environment or heredity? Explain your answer.
Answer:
I believe forming an environmental personality is more important than forming a hereditary personality. Why I said this is because of the people around out can change your personality, and sometimes if you're with the wrong people, it can go wrong, with your personality too. You could have been a nice person at some time, you bur you hung out with the wrong people and now you're just very inconsiderate. Another reason on why I believe forming an environmental personality is more important because of the fact that maybe you could've been born with a parent who has a bad personality. You could try your best to be nicer by the choice of people you choose to be friends with.
Explanation:
i hope this helped, im only in 7th
Since we know that _______________, we can conclude that the gas produced when mixing bath bombs in water could not be baking soda, citric acid, or water.
Answer:
Sodium bicarbonate.
Explanation:
The gas produced during the mixing of bath bombs in water is Sodium bicarbonate. If the reaction is with citric acid then Sodium citrate can be produced. They are weak acid with bicarbonate base. These bath bombs can be a mixture of wet and dry substances and any shape can be mold.
How many electrons did chlorine gain to become an atom with -1 charge ?
Answer:
17 electrons. On the right, the chloride ion has 18 electrons and has a 1− charge.
Explanation:
Tritium (hydrogen-3) has a half-life of 12.3 years. How old is a bottle of wine if the tritium content is determined to be 25% in new bottle of wine
Answer:
24.6 years
Explanation:
Applying,
A = (A')[tex]2^{a/n}[/tex]..................... Equation 1
Where A = Original Tritium content in the wine, A' = Tritium content in the wine after decay, a = age of the old bottle, n = half life of Tritium
From the question,
Let A = X, therefore, A' = 0.25X
Given: n = 12.3 years
Substitute these values into equation 1
X = 0.25X([tex]2^{a/n}[/tex])
1 = 0.25×([tex]2^{a/12.3}[/tex])
1/0.25 =
4 = [tex]2^{a/12.3}[/tex]
[tex]2^{a/12.3}[/tex] = 2²
Equation the base,
a/12.3 = 2
a = 12.3×2
a = 24.6 years
2Al + 6HCl --> 2AlCl3 + 3H2 Aluminium reacts with hydrochloric acid. How many grams of aluminum are necessary to produce 11 L of hydrogen gas at STP? ( 8.8 g )
Answer:
8.8g of Al are necessaries
Explanation:
Based on the reaction, 2 moles of Al are required to produce 3 moles of hydrogen gas.
To solve this question we must find the moles of H2 in 11L at STP using PV = nRT. With these moles we can find the moles of Al required and its mass as follows:
Moles H2:
PV = nRT; PV/RT = n
Where P is pressure = 1atm at STP; V is volume = 11L; R is gas constant = 0.082atmL/molK and T is absolute temperature = 273.15K at STP
Replacing:
1atm*11L/0.082atmL/molK*273.15K = n
n = 0.491 moles of H2 must be produced
Moles Al:
0.491 moles of H2 * (2mol Al / 3mol H2) = 0.327moles of Al are required
Mass Al -Molar mass: 26.98g/mol-:
0.327moles of Al * (26.98g / mol) = 8.8g of Al are necessaries
What are five different types of air pollutant each