Answer:
Constituent substances of a colloid cannot be separated by ordinary filtration because the size of the particles in a colloid (or colloidal solution) is bigger than those in a true solution but smaller than those in suspension. It is between 1 nm to 100 nm in diameter.
ex- cheese, milk, aerosol spray, mayonnaise
Type the correct answer in the box. Express your answer to two significant figures.
A reaction between 1.7 moles of zinc Ipdide and excess sodium carbonate ylelds 12.6 grams of zinc carbonate. This is the equation for the
reaction:
Na2CO3 + Zniz - 2Nal +
ZnCoz.
What is the percent yield of zinc carbonate?
The percent yield of zinc carbonate is
5.91
1X.
Answer: The percent yield of zinc carbonate is 5.91 %
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} ZnCO_3=\frac{12.6 g}{125.4g/mol}=0.100moles[/tex]
[tex]ZnI_2[/tex] is the limiting reagent as it limits the formation of product and [tex]Na_2CO_3[/tex] is the excess reagent.
[tex]Na_2CO_3+ZnI_2\rightarrow 2NaI+ZnCO_3[/tex]
According to stoichiometry :
1 mole of produce = 1 mole of
Thus 1.7 moles of [tex]ZnI_2[/tex] will produce=[tex]\frac{1}{1}\times 1.7=1.7moles[/tex] of [tex]ZnCO_3[/tex]
Theoretical yield of [tex]ZnCO_3=moles\times {\text {Molar mass}}=1.7moles\times 125.4g/mol=213.2g[/tex]
percentage yield = [tex]\frac{\text {Experimental yield}}{\text {Theoretical yield}}\times 100=\frac{12.6g}{213.2g}\times 100=5.91\%[/tex]
Answer:
the other person was right EXCEPT it says in 2 significant numbers so the answer is 5.9
Explanation:
i hope this helps. have a wonderful day :))
Which object is smaller than a cell?
Molecule
Organ
Organism
Tissue
Answer:
Molecule
Explanation:
Levels of organization (atom-molecule-cell-tissue-organ-organ-system-organism)
A student titrated 50 cm of sulphuric acid (H2SO4)of an unknown concentration
in a flask with sodium hydroxide (NaOH).
The acid required 30 cm3 of 0.500 mol/dm3 NaOH to reach the end point
H2SO4(aq)
+ 2NaOH(aq)
Na2SO4(aq) + 2H2O()
Calculate the concentration the acid.
Concentration =
mol/dm3
Help asp please thanks
How do you know if a material is an elernent or a compound?
Explanation:
Elements and compounds are both examples of pure substances. A substance that cannot be broken down into chemically simpler components is an element. ... A substance that can be broken down into chemically simpler components (because it has more than oneelement) is a compound.
I need help with my science project someone help me answer it!
Answer:
food
Explanation:
3. An unknown solution has a pH of 10. Based on the pH scale, the solution can be described as
Explanation:
For example, pH 10 is ten times more alkaline than pH 9 and 100 times (10 times 10) more alkaline than pH 8. Pure water is neutral. But when chemicals are mixed with water, the mixture can become either acidic or basic.
An alpha particle is identical to a:
helium nucleus
hydrogen nucleus
high energy electron
radium nucleus
Answer: helium nucleus
What happens when you mix calcium chloride and hydrogen peroxide?
Answer:
Explanation: When chlorine reacts with hydrogen peroxide, hydrogen peroxide falls apart into water and oxygen. Chlorine gas hydrolyses into hypochlorous acid (, which subsequently into hypochlorite ions . The reaction between hydrogen peroxide and hypochlorite takes place very quickly.
A gas has a volume of 15.0 ml at 25 degree Celsius. What is the volume of the gas at 50 degree Celsius.
Answer:
30.0ml
Explanation:
Half of fifty is 25 and 25 represents 15.0ml so 15.0ml×2=30.0ml there for 25+25 is 50
Which phrase best describes an individual organ
Answer:
the answer is B
Explanation:
Which pieces of equipment are
needed to calculate the velocity of a
falling object?
A stopwatch and balance
B speedometer and magnet
C compass and tape measure
D tape measure and stopwatch
Are the following equations balanced or unbalanced?
1. SnO2 + 2H2 → Sn + 2 H2O
2. 4NH3 + 5O2 → 4NO + 6H2O
3. 2B2Br6 + 5HNO3 2 B(NO3)3 + HBr
4. 2KNO3 + 1H2CO3 → 1K2CO3 + 2HNO3
potassium solid and aqueous zinc chloride react to produce what?
K (s) + ZnCl (aq) ====》 KCl ( aq) + Zn (s)
How many grams is 2.393 x 10^24 atoms of CI
70.45 g CI
140.9 ga
140.9 mole CI
70.45 mole CI
How many grams is 2.393 x 10^24 atoms of O
70.45 g O
140.9 g O
63.58 mole O
63.58 g O
Answer: 1. 140.9 g Cl
2. 63.58 g O
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given atoms}}{\text {avogadro's number}}[/tex]
1. [tex]\text{Number of moles of Cl}==\frac{2.393\times 10^{24}}{6.023\times 10^{23}}=3.973moles[/tex]
1 mol of Cl weighs = 35.5 g
Thus 3.973 mol of Cl weighs = [tex]\frac{35.5}{1}\times 3.973=140.9g[/tex]
2. [tex]\text{Number of moles of O}==\frac{2.393\times 10^{24}}{6.023\times 10^{23}}=3.973moles[/tex]
1 mol of O weighs = 16 g
Thus 3.973 mol of O weighs = [tex]\frac{16}{1}\times 3.973=63.58g[/tex]
Jose was driving to New York City. He traveled 100 miles in the first hour of the trip and 20 miles in the last hour of his trip. Which can we
say about Jose's drive? (speed = distance = time)
A. Jose drove less than 120 miles.
B. Jose drove faster the first hour of his drive.
C. Jose drove slower the first hour of his drive.
D. Jose drove the same speed for the entire drive.
Answer:
b
Explanation:
he drove 5x faster than the time was when he was on the last hour (maybe caught in traffic or wasn't in a rush)
10g of marble was added to 15 grams of dilute hydrochloric acid, product formed is calcium chloride, water and carbon dioxide. which of the following is true?
Answer:
Hydrochloric acid is the excess reactant
Explanation:
I got it right lol
The correct answer is Option B.
Hydrochloric acid is the excess reactant.
Explain about exothermic reaction?An exothermic reaction is one in which energy is given off as heat or light. In contrast to an endothermic reaction, which draws energy from its surroundings, an exothermic reaction transfers energy into the environment.Calcite in marble and limestone dissolves when sulfurous, sulfuric, and nitric acids in polluted air and rain react with it. We observe roughened surfaces, the removal of material, and the loss of carved details in exposed areas of buildings and statues.Because of its basic nature, the calcium carbonate in marble neutralizes the hydrochloric acid in the reaction described above. A base is defined as "a compound that reacts with an aqueous solution of an acid to produce a water and salt solution in which the salt gets separated into its component ions." Any extra salt that remains after a given salt solute has saturated the aqueous solution precipitates out of the solution.To learn more about exothermic reaction refer to :
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please help im so bad at science
a.bond energy
c. endothermic reaction
d. exothermic reaction
f.exothermic
g.endothermic
A study was conducted to see if increasing the substrate concentration has an appreciable effect on the velocity of a chemical reaction. With a substrate concentration of 1.5 moles per liter, the reaction was run 15 times, with an average velocity of 7.5 micromoles per 30 minutes and a standard deviation of 1.5. With a substrate concentration of 2.0 moles per liter, 12 runs were made, yielding an average velocity of 8.8 micromoles per 30 minutes and a sample standard deviation of 1.2. Is there any reason to believe that this increase in substrate concentration causes an increase in the mean velocity of the reaction of more than 0.5 micromole per 30 minutes
Answer:
There is not enough evidence
Explanation:
For 1.5 moles substrate concentration per liter
Reaction ( n2 ) = 15 runs
average velocity ( x2 ) = 7.5 micromoles per 30 minutes
standard deviation ( s2 ) = 1.5
For 2.0 moles substrate concentration per liter
Reaction( n1 ) = 12 runs
average velocity ( x1 ) = 8.8 micromoles per 30 minutes
standard deviation ( s1 ) = 1.2
Show Reason to believe that this increase in substrate conc causes an increase in mean velocity
Hypothesis test
H0 : μ1 - μ2 = 0.5
H1 : μ1 - μ2 > 0.5
level of significance ( ∝ ) = 0.01
attached below is a detailed solution to the problem
P-value ( 0.073 ) > level of significance ( 0.01 ) hence we fail to reject the null hypothesis
hence there in not enough evidence to believe that this increase causes an increase in the mean velocity of the reaction of more than 0.5 micromole per 30 minutes
a solution is prepared by dissolving 55g of CaCl2 into 300g of water. if the Kf of water is -1.86 c/m, shat is the freezing point depression of the solution
Answer:
Relation between , molality and temperature is as follows.
T =
It is also known as depression between freezing point where, i is the Van't Hoff factor.
Let us assume that there is 100% dissociation. Hence, the value of i for these given species will be as follows.
i for = 3
i for glucose = 1
i for NaCl = 2
Depression in freezing point will have a negative sign. Therefore, d
depression in freezing point for the given species is as follows.
=
=
=
Therefore, we can conclude that given species are arranged according to their freezing point depression with the least depression first as follows.
Glucose < NaCl <
Explanation:
The boiling process is considered to be____
your answer is D. physical change, because a new substance is not formed.
The boiling process is considered to be a physical change as no new substance is formed.
What is a physical change?Physical changes are defined as changes which affect only the form of a substance but not it's chemical composition. They are used to separate mixtures in to chemical components but cannot be used to separate compounds to simpler compounds.
Physical changes are always reversible using physical means and involve a change in the physical properties.Examples of physical changes include melting,boiling , change in texture, size,color,volume and density.Magnetism, crystallization, formation of alloys are all reversible and hence physical changes.
They involve only rearrangement of atoms and are often characterized to be changes which are reversible.
Learn more about physical change,here:
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Can someone answer this, NO ROBOTS!!!!
Genetic engineering improved the lives if individuals with insulin because it helps the body use and store sugar, since people with diabetes can't produce insulin.
Where are the places these minerals are found: Gold, Limestone and kaiolin.
Explanation:
Gold: The Kolar Gold Fields in Kolar used to be one of the major producers of gold in India, before it shut down. Presently the gold mines of Hutti and Raichur produce almost 84 per cent of the country’s gold. The other major centers of gold mining are Dharwad and Chitradurga. The gold mines produce about 3,000 kg’s of gold per annum. The district of Raichur is also famous for its silver deposits.
Limestone: It is another important mineral with an estimated 51,000 million tons. Karnataka has the largest limestone reserve in India. The districts of Gulbarga, Bagalkot, Belgaum, Shimoga and other Uttara Kannada districts are endowed with extensive high grade limestone. The present and consistent production of approximately 14 million tonnes provides for the cement plants in these districts.
China clay (kaolin) consisting dominantly of kaolinite is one of the most sophisticated industrial minerals with a host of applications, viz., in ceramics, refractories, paper coating, filler for rubber, insecticides, cement, paint, textiles, fertilizers and others including abrasives, asbestos products, fibreglass, chemicals, cosmetics, pharmaceuticals, electrical ware, foundry and glass.
The Department of Mining and Geology through their past investigation campaigns in parts of Kerala,identified two major china clay zones viz., the southern china clay zone between Thiruvananthapuram and Kundara (Thiruvananthapuram and Kollam districts) and the northern china clay zone between Kannapuram Madayi -Cheruthazham in Kannur district to Nileswarm - Manjeshwaram in Kasargod district. An estimated reserve of 172 million tonnes (probable reserve of 80 million tonnes and possible reserve of 92 million tonnes) of china clay of sedimentary and residual origin has been arrived at.
Kerala china clay is one of the finest quality clay and is world class. In fact, Kaolin marketed by English Indian Clays Ltd. (EICL), Thiruvananthapuram claims to have similar or even better properties compared to imported clays.
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PLEASE HELP
How does increasing the amount of greenhouse gases affect the earth?
It causes more hurricanes and tornadoes.
It lowers the earth's global temperature.
It causes fewer thunderstorms.
It raises the earth's global temperature.
Mark other guy brainliest
I needed the answer for the test and he is correct
How many moles are in 46.7g of H2O gas?
Please help me and it have a next one I’m going to post it now
A book is pushed and released and it slides across a table for a short distance. The book quickly comes to a stop. The book originally
has kinetic energy. To what form of energy is the kinetic energy transformed?
A)
The kinetic energy is transformed into heat.
B)
The kinetic energy is transformed into chemical energy.
C)
The kinetic energy is not transformed into any other type of energy.
Eliminate
D)
The kinetic energy is transformed into electrical energy.
Law of Conservation of Energy
(58P2.c) Energy Transformation
D 149628
Regular Cals
Scientific Cals
My
Answer:
A
Explanation:
The book encountered friction which turned some of the energy into heat.
The plant chemical which absorbs sunlight and helps make cell food is
A.osmosis
B.cellulose
C.vaculoe
D.chlorophyll
Answer:
chlorophyll
Explanation:
HELP PLEASE ASAP!!!!!
the cell is undergoing a step of meiosis I. what step is the cell in?
a. the beginning of prophase I
b. the middle of metaphase I
c. the end of anaphase I
d. the middle of telophase I
Answer:
I think it's c
Explanation:
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A sample of oxygen gas occupies a volume of 250 mL at .8 atm of pressure. What volume will it occupy at 1.2 atm of pressure?