Answer:
[tex]\% diss = 50\%[/tex]
Explanation:
Hello there!
In this case, when considering weak acids which have an associated percent dissociation, we first need to set up the ionization reaction and the equilibrium expression:
[tex]HA\rightleftharpoons H^++A^-\\\\Ka=\frac{[H^+][A^-]}{[HA]}[/tex]
Now, by introducing x as the reaction extent which also represents the concentration of both H+ and A-, we have:
[tex]Ka=\frac{x^2}{[HA]_0-x} =10^{-4.74}=1.82x10^{-5}[/tex]
Thus, it is possible to find x given the pH as shown below:
[tex]x=10^{-pH}=10^{-4.74}=1.82x10^{-5}M[/tex]
So that we can calculate the initial concentration of the acid:
[tex]\frac{(1.82x10^{-5})^2}{[HA]_0-1.82x10^{-5}} =1.82x10^{-5}\\\\\frac{1.82x10^{-5}}{[HA]_0-1.82x10^{-5}} =1\\\\[/tex]
[tex][HA]_0=3.64x10^{-5}M[/tex]
Therefore, the percent dissociation turns out to be:
[tex]\% diss=\frac{x}{[HA]_0}*100\% \\\\\% diss=\frac{1.82x10^{-5}M}{3.64x10^{-5}M}*100\% \\\\\% diss = 50\%[/tex]
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Jennifer has a jar full of stones. For one year, Jennifer shakes the jar several times each day. The illustration below shows the changes that occurred after one year. What process does this illustration show?
Jennifer has a jar full of stones. For one year, Jennifer shakes the jar several times each day. The illustration below shows the changes that occurred after one year, and this shows that because of the fragmentation, this happens.
Initially, before a year, there were many rocks, but as she continuously shrank the box, that led to the fragmentation. Due to vibration for a long time, the larger rocks break into the smaller particles as a result of the amount of rocks converted into the small particles and sands. These smaller stone fragments may then accumulate at the bottom of the jar as a result of this there is a decrease in the overall number of stones in the jar.
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How many atoms are contained in 12.8 g of Beryllium?
A9.0 atoms
B9.0 x 10 23 atoms
C8.55 atoms
D8.55 x 1023 atoms
Answer:
a atoms
Explanation:
Answer:
C. 8.55 atoms
Explanation:
(Earth and Space Science)
The sun rotates ___.
A. Around earth once per year.
B. Every 31 days.
C. At different speeds along it's sphere.
D. Once per year
Answer:
B.every 31 days
Explanation:
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4. Ionic compounds conduct electricity when they are in the __ state
Answer:
Salts do not conduct electricity at the solid state since the ions are in a fixed position in the lattice. However, at the molten state or in solution, the ions are free and they can move within the liquid phase to serve as electrons shuttles and therefore, they become conductive.
Explanation:
Anatom of an element has no electron,will that atom have any mass or not? Can antom exist
without electron? if so give an example.
Answer:
Generally, all atoms of elements contain three sub-atomic particles- Protons(Positively-charged), Neutrons(Neutral) and Electrons(Negatively-charged).
The Magnitude of the Positive Charge possessed by the Protons and the Magnitude of the Negative Charge possessed by the Electrons cancel each other, which make the atom electrically neutral.
Hence,
Without any electrons, the magnitude of the positive and negative charges wouldn't balance, and the atom would be unstable and disintegrate almost immediately. Hence, all stable atoms should have electrons revolving around them, where the number of protons and electrons are the same, under normal conditions.
To Conclude,
Every atom of an element will have electrons arranged in different shells, or matter couldn't exist without electrons.
An element is BEST described as a substance that:
is made of atoms
Cannot be broken down into other substances
Contains water
Is a metal used in kettles
Answer:
Cannot be broken down into other substances
Explanation:
Which of the following describes how a recycling program directly benefits a community economically? The guarantee of no new landfills or incinerators O Fewer city taxes than in non-recycling communities O More potential employment opportunities and revenue O Higher property values than non-recycling communities Mark this and return
Answer:
I guess second option i.e. More potential employment opportunities and revenue because collecting recyclable material needs manpower to collect them, and secondary employment in transport i.e. to collect all the material at one place we need transport and so on!
Magnesium bromide is an ionic compound with the chemical formula MgBr2, Magnesium is
Answer:
These are Magnesium bromide is MgBr2. “ionic compounds.” When atoms join together, they form either molecules or ionic compounds, depending on whether they are joined by covalent bonds or ionic bonds. ... When atoms join together by ionic bonds, they form “ionic compounds”.
Explanation:
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M C Q s
1) The most reactive metal is :
a) Na b) Cu c) Fe d) Ca
Answer:
A
Explanation:
A, Na b/c The elements toward the bottom left corner of the periodic table are the metals that are the most active in the sense of being the most reactive. Lithium, sodium, and potassium all react with water,
4.What type of energy is used to fuel the process of photosynthesis and what type is produced in
respiration?
A Light energy is used in photosynthesis and created by respiration.
B ATP is used in photosynthesis, which allows the plant to undergo respiration.
C Light energy is used in photosynthesis, whereas respiration creates the energetic product, ATP.
D Food energy is used in photosynthesis and ATP is produced in respiration.
Answer:
A. light energy is used in photosynthesis and created by respiration
5 *
1 point
Two elements are in the same group of the Periodic Table.
Which property will be the same for both elements?
A the charge on their ions
B their electronic structure
C their melting point
D their reactivity with water or acids
Answer:
A. the charge on their ions
Explanation:
Elements are grouped into the same group in the periodic table if they have the same valence electrons. However, the number of valence electrons an element has, determines the number of charges it can possess.
According to this question, two elements in the same group of the periodic table will have the same charge on their ions because they both have the same number of valence electrons.
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Answer: pls mark brainliest
Explanation: i think so its D
How many molecules are there in 2.00 moles of ammonia (NH,)?
Answer:
Explanation:
molecules NH3 = 1.47 moles x 6.02x1023 molecules/mole = 8.9x1023 molecules of NH3
Calculate the mass in grams of 550 mol of aluminum
Help please!
Answer:
Explanation:
1 mol of Aluminum = 26.98 grams
550 mol of Aluminum = x
1 * x = 550 * 26.98
x = 14839 grams
what is the scientific method
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The scientific method is an empirical method of acquiring knowledge.
These are the 5 scientific methods:
Make observations Ask questionsForm hypothesis make a predictionExamineIn chemical reactions, the number of atoms in the product is ________________.
A. the same as the number of atoms in the reactants
B. less than the number of atoms in the reactants
C. greater than the number of atoms in the reactants
D. the same as the number of molecules in the reactants
Answer:
A
Explanation:
The roots of plants are important to photosynthesis because they...
O A
remove glucose from the plant.
ОВ.
remove oxygen from the plant.
OC. provide the water needed.
D. provide the carbon dioxide needed.
Answer:
[tex]\boxed {\boxed {\sf C. \ Provide \ the \ water \ needed}}[/tex]
Explanation:
Photosynthesis is an extremely important process for plants, algae, and some bacteria. It helps create their "food", which is glucose. It is turned into energy so the organism can grow, repair damages, and carry out other processes.
The equation for photosynthesis is as follows:
[tex]H_2O+CO_2+energy \rightarrow C_6H_{12}O_6 + O_2[/tex]
Water, carbon dioxide, and light energy from the sun are converted to glucose and oxygen.
Roots are important for obtaining water. Since they reach into the soil, they can absorb the water. Then, capillary action draws the water up the stem into the xylem and then into the leaves, where photosynthesis occurs.
why should we put a glass on candles for experiments and why should we put candles on sand trays ?
Answer:
1, you should use candles for experiments because, You created an area of low pressure! When the experiment is run you can see tiny bubbles escaping under the glass which shows that the increased air pressure from the heated air as the candle burns. Once the candle runs out of oxygen, the candle burns out and the remaining air inside cools down.
2. you should put candles on sand trays, Pour layers of sand into a glass vase, alternating colors with each layer. For a more interesting look, try uneven layers in various heights. Keep layering sand until you're a few inches from the top of the vase. Place your votive candle in the center of the sand.
Explanation:
its scientific proven
How many milliliters of a 3.28 M copper (II) nitrate Cu(NO3)2
solution are needed to provide a total of 146.59 g of Cu(NO3)2?
Use 187.56 g/mol as the molar mass of solute. Solve your answer
to two decimal places.
Answer:
237.80mL
Explanation:
Molarity of a solution can be calculated using the formula;
Molarity = number of moles (n) ÷ volume (V)
However, we first need to calculate the number of moles of Cu(NO3)2 by using the formula:
moles = mass/molar mass
Molar mass of Cu(NO3)2 = 187.56 g/mol
moles = 146.59 ÷ 187.56
moles = 0.782moles
Molarity = n/V
3.28 = 0.78/V
V = 0.78/3.28
V = 0.2378L
In milliliters (mL), 0.24 litres = 0.24 × 1000
= 237.80mL
A compound is composed of 53.33%carbon, 11.11%hydrogen and 35.56%oxygen. If the molecular mass of the compound is 90, what is the molecular formula of this compound?
Only awnser #5#6#7#8 please 20 points! And i will mark brainliest.
Answer:
5. radiative zone 6. 27 million degrees Farenheit 7. photosphere 8. approximately 25 million degrees Farenheit if using the calculation for the core temperature of the sun at 27 million degrees as the corona is 2 million degrees
Explanation:
What makes a gas a gas?
Answer:
Gas is one of the four fundamental states of matter (the others being solid, liquid, and plasma). A pure gas may be made up of individual atoms (e.g. a noble gas like neon), elemental molecules made from one type of atom (e.g. oxygen), or compound molecules made from a variety of atoms (e.g. carbon dioxide).
Explanation:
The graph shows a heating curve for water.
Which point on the graph indicates that all of the liquid water has been converted to water vapor?
1
2
3
4
Answer:
4
Explanation:
water starts to boil into water vapor at 100'C. at this point, temperature becomes costant at 100'C as heat energy is used up by the particles to overcome the intermolecular forces between the molecules.
once the forces holding the particles together have been overcome, the temperature will start to rise again showing that all the liquid water has been converted into water vapor
How many atoms are in 14 moles of I? Watch your significant figures.
A. 8.4 x 10^24 atoms of l
B. 8.43 x 10^24 moles of l
C. 8.4 x 10^23 atoms of I
D. 8.43 atoms of l
Answer:
may be A, 8.43 × 10........ atoms of l
6 NaOH + 2 Al --> 2 Na3AlO3 + 3 H2 If you start with 258 g of Al, how many moles of Na3AlO3 can you make?
Solution :
Assuming all Al will be consumed in the reaction.
From the given equation, 2 mole of Al produce 2 mole of [tex]Na_3AlO_3[/tex].
So, 1 mole of Al produce 1 mole of [tex]Na_3AlO_3[/tex]. .....statement 1)
Number of moles of Al in 258 gram of Al.
[tex]n = \dfrac{mass}{molar\ mass}\\\\n = \dfrac{258}{27}\ moles\\\\n = 9.556 \ moles[/tex]
Therefore, from statement 1) number of moles of [tex]Na_3AlO_3[/tex] produced is also 9.556 moles.
How many ammonia molecules can be made with 1 N2 and 3 H2? Please explain.
Answer:
You have described a scenario where nitrogen is the limiting reagent since:
2 N2 + 6 H2 → 4 NH3
You could make four molecules of ammonia and have four molecules of hydrogen left over.
Someone said that light bent around a corner to reach an object. Is this possible?
Answer: Yes, light can bend around corners. ... The ability of light to bend around corners is also known as "diffraction". There are two mechanisms that cause light to bend around corners. Light waves indeed bend around corners because of diffraction, as shown in this illustration.
Explanation:
How many moles are there in 321g of silver hydroxide?
Need to show my work so please show how you got it
Need Help!!
Explain the relationship between volume and temperature (Charles’ Law)
Answer:
the volume of a give gas simple is directly propotional assolute temperature at constant pressure .the volume of a gavi. amount of gass is inversely propotional ot Its pressure when temperature is help constant
Harold’s car has a fuel efficiency of 35 miles per gallon. Frank’s car has a fuel efficiency of 12 kilometers per liter. Who gets better gas milage, Harold or Frank?
Answer: Harold car has better mileage
Explanation: US gallon is 3.785 litres and one mile is 1.6 km.
35 · 1.6 km/ 3.785 l = 14.8 km/l
The Harold's car has a fuel efficiency of 35 miles per gallon and has better gas mileage.
What is efficiency?The efficiency is defined as the peak level of performance that uses the least amount inputs to achieve the highest amount of output.
Effectiveness is the ability to produce a better result, one that delivers more value or achieves a better outcome.
Efficiency is expressed as
Efficiency = output / input
The mileage of Harold's can be calculated as:
US gallon has 3.785 liters and 1 mile is 1.6 km
Thus mileage = 35 x 1.6 km / 3.785 l
= 14.8 km/l
Mileage of Frank's car = 12 x 1.6 km / 3.785 l
= 5.07 km/l
Thus, the Harold's car has a fuel efficiency of 35 miles per gallon and has better gas mileage.
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