Answer:
This is the answer to the question 0.1734
Explanation:
3.5/20.18
=0.1734
The average annual return from stock investments historically is:
a) 11.3%
b) 12%
C) 12.5%
d) 20%
Answer:
11.3%
Explanation:
The stock market’s average annual return through history is 11.3%, which is more than most savings accounts pay.
Determine how many ml of water you need to remove, by evaporation, if you have a 500 ml of 10.20 M HNO3 dilute solution and you need to make it a 12 M HNO3 stock solution.
The total volume of water that would be removed will be 75 mL
Dilution equationUsing the dilution equation:
M1V1 = M2V2
In this case, M1 = 500 mL, V1 = 10.20 M, M2 = 12 M
Substitute:
V2 = 500 x 10.20/12
= 425 mL
The final volume in order to arrive at 12 M HNO3 would be 425 mL from the initial 500 mL. Thus, the total amount of water that will be removed by evaporation can be calculated as:
500 - 425 = 75 mL
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when methane reacts with oxygen, the products are carbon dioxide and water. How many grams of carbon dilxide are formed if 30 g of methane react completely with 75 g of oxygen to form 50 g of water?
Answer:
CH4+2O2→CO2+2H2O
Moles of oxygen=3232=1
Moles of carbon dioxide=4422=0.5
Moles of water=1818=1
1 mole of methane reacts with 2 moles of oxygen to give 1 mole of CO2 and 2 moles of water so 0.5 mole of methane will be required which is equal to 0.5×16=8g.
Explanation:
8g
Why is Carbon not used as a refactory material
Answer:
Probably because of the dangers
Explanation:
Carbon when emitted causes large damage to the air, so it would be risky because of both the impact on the environment and the consequences the government would give them. It could also be because Carbon isn't durable enough to be burned as a refractory material.
Dissolve 30 g of sodium sulphate into 300 mL of water
determine the number of moles of sodium sulphate in the solution
Answer:
number of moles = 0.21120811
Explanation:
To find the number of moles, given the mass of the solute, we use the formula:
[tex]\mathrm{n = \dfrac{ m }{ M } }[/tex]
[tex]\mathrm{n = number\:of\:moles\:(mol)}[/tex]
[tex]\mathrm{m = mass\:of\:solute\:(g)}[/tex]
[tex]\mathrm{M = molar\:mass\:of\:solute\:( \dfrac{ g }{ mol } )}[/tex]
Label the variables with the numbers in the problem:
[tex]\mathrm{n =\:?}[/tex]
[tex]\mathrm{m =30\:g }[/tex]
[tex]\mathrm{M =\:?\:Calculate\:the\:molar\:mass }[/tex]
The first thing we have to do is find the molar mass of sodium sulfate, in order for us to use the formula for finding the number of moles:
Formula for finding the molar mass of sodium sulfate:
[tex]M({ \left Na \right }_{ 2 } { \left So \right }_{ 4 }) = m \left( Na \right) +m \left( S \right) +m \left( O \right)[/tex]
For the variables and what they mean are below for finding the molar mass of sodium sulfate:
[tex]\mathrm{M =molar\:mass }[/tex]
[tex]\mathrm{m =moles=2\:moles\:for\:Na\:,1\:mole\:for\:S,\:and\:4\:moles\:for\:O}[/tex]
[tex]\mathrm{Na =sodium=22.99\:g }[/tex]
[tex]\mathrm{S =sulfur=32.06\:g }[/tex]
[tex]\mathrm{O =oxygen=16.00\:g }[/tex]
Plug the numbers into the formula, to find the molar mass of sodium sulfate:
[tex]M({ \left Na \right }_{ 2 } { \left So \right }_{ 4 }) = m \left( Na \right) +m \left( S \right) +m \left( O \right)[/tex]
[tex]\mathrm{Substitute\:the\:values\:into\:the\:formula}[/tex]
[tex]M = 2 \left( 22.99 \right) +1 \left( 32.06 \right) +4 \left( 16.00 \right)[/tex]
[tex]\mathrm{Multiply\:2\:by\:22.99\:to\:get\:45.98\:and\:1\:by\:32.06\:to\:get\:32.06}[/tex]
[tex]\mathrm{M = 45.98+32.06+4\:(16)}[/tex]
[tex]\mathrm{Multiply\:4\:by\:16\:to\:get\:64}[/tex]
[tex]\mathrm{M = 45.98+32.06+64}[/tex]
[tex]\mathrm{Add\:45.98\:and\:32.06\:to\:get\:78.04}[/tex]
[tex]\mathrm{M = 78.04+64}[/tex]
[tex]\mathrm{Add\:78.04\:and\:64\:to\:get\:142.04}[/tex]
[tex]\mathrm{M = 142.04}[/tex]
Now that we have found the molar mass, we can calculate the number of moles in the solution of sodium sulfate with the formula:
[tex]\mathrm{n = \dfrac{ m }{ M } }[/tex]
[tex]\mathrm{n =\:?}[/tex]
[tex]\mathrm{m =30\:g }[/tex]
[tex]\mathrm{M = 142.04\:g/mol}[/tex]
[tex]\mathrm{Substitute\:the\:values\:into\:the\:formula}[/tex]
[tex]\mathrm{n = \dfrac{ 30 }{ 142.04 }}[/tex]
[tex]\mathrm{Divide\:142.04\:by\:30\:to\:get\:0.21120811}[/tex]
[tex]\mathrm{n = 0.21120811}[/tex]
0.21120811 rounded gives you 0.2112
or if you did the problem without decimals
30 grams of sodium sulfate divided by its molecular weight – which we found to be 142 – gives us a value of 0.2113 moles.
5.00 kg glycol, Ca(OH)2. [this is antifreezel] is added to your radiator. If your radiator contains 12.0 kg
of water, what would be the freezing point of the water-antifreeze mixture? The molal freezing point
depression constant for water is 1.86 'C.kg/mole.
The freezing point is mathematically given as
ft=-12.5C
What would be the freezing point ?Question Parameters:
5.00 kg glycol, Ca(OH)2. [this is antifreeze] is added to your radiator. If your radiator contains 12.0 kg
The molar freezing point depression constant for water is 1.86 'C.kg/mole.
Generally the equation for the Freezing point is mathematically given as
ft=k f [tex]\frac{wB}{Mb}*1000/Wa[/tex]
Therefore
0-ft=1.89*5000.62*1/12
ft=-12.5C
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12.
Which of the following does not indicate that a chemical reaction occurred when the iron filings
were added to the copper(II) sulfate?
You didn't provide the answer choices so I'll give all that I know.
No color change occurs
No odor is produced
No gas is produced
No temperature change occurs(Stays at room temp)
No precipitation occurs
Please see the attached file and answer. I need this ASAP!
Giving Brainliest!
Answer:
Answer no. 2
Explanation:
Distillation is the process of separating consistent solids from a liquid mixture
Suppose you have a sample of table salt (NaCl) that has a mass of 100.0 grams. If
this amount of salt is added to a large beaker and filled with water until the total
volume is 2 liters, what is the concentration of this solution in units of Molarity?
Please do not include any units in your answer.
Taking into account the definition of molarity, the concentration of the solution is 0.855 [tex]\frac{moles}{liter}[/tex].
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Molarity of NaClIn this case, you have:
number of moles of NaCl= [tex]100 grams\frac{1 mole}{58.45 grams} =[/tex]1.71 moles (being 58.45 g/mole the molar mass of NaCl)volume 2 LReplacing in the definition of molarity:
[tex]Molarity=\frac{1.71 moles}{2 L}[/tex]
Solving:
Molarity= 0.855 [tex]\frac{moles}{liter}[/tex]
Finally, the concentration of the solution is 0.855 [tex]\frac{moles}{liter}[/tex].
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Which of the following is the only genotype not able to taste PTC.
a. IT
b. Tt
c. tt
How many moles of Cu(OH)2 will be produced if given 1 mole
KOH.
Answer:
0.032 mole
Explanation:
Please mark me as brainliest
The following questions refer to the equilibrium shown here:
4NH3(g) + 5O2(g) <-> 4NO(g) + 6H2O(g)
For a certain reaction at 25.0°C, the value of K is 1.2 × 10–3. At 50.0°C the value of K is 3.4 × 10–1. This means that the reaction is:
a. Never favorable
b. More information needed
c. Endothermic
d. Exothermic
e. None of the above
The value of K changes, affected by temperature
Endothermic (ΔH = +): temperature rises ⇒ K increases
Exothermic (ΔH = -): temperature increases ⇒ K decreases
From the data in the problem, the value of K increases in proportion to the temperature, then the reaction is said to be endothermic (C)
pls do in 1 hour!!!!!!!
Answer:
c) burrow underground
a) false
a) save rain water
c) prevent animals eating it
Instead of leaves, most cacti have spines or scales (which are modified leaves). These spines and scales do not lose water through evaporation (unlike regular leaves, which lose a lot of water). The spines protect the cactus from predators (animals that would like to eat the cactus to obtain food and/or water).
b) false
What abiotic factors do humans need?
The most important abiotic factors include water, sunlight, oxygen, soil and temperature. Water (H2O) is a very important abiotic factor – it is often said that “water is life.” All living organisms need water. In fact, water makes up at least 50% of almost all living things
How many unpaired electrons are found in a ground state atom of Os?
Answer:
two unpaired electrons
Explanation:
each of which are located in a different pi* antibounding orbital.
what is one advantage of doing a feild experiment instead of a laboratory experiment
Answer:
Field experiments can often have the potential to give scientists opportunities that are not possible in a lab setting.
Explanation:
Having people "act natural" in a lab setting is impossible to truly achieve, as we all know what happens to our mental state and behavior when we are being actively observed. This is also especially helpful when conducting wildlife research, as there are a myriad of different things influencing animal and plant behavior that would be nigh impossible to recreate perfectly in a controlled lab setting.
Field research can have its disadvantages as well, as it is very hard to only have one thing change (make an independent variable) in a wild environment with ever-changing weather, social effects, etc. Also, you, as the researcher, as causing an impact on the very location that you are observing, which can alter your results in unpredictable ways.
The thing to remember is that each type of study has its advantages and disadvantages; if they didn't, then we'd all do the same type of research! You have to weigh your research options and figure out which one works best for your situation :)
pls answer properly I will rate 5 and brainlist just answer properly and I need it now just answer what you know in the question
Answer:
Fire is a chemical hazard, because of explosives and nukes. Falling debris is physical, difficulty breathing is a biological hazard, and fungi, pesticides, and cockroaches are biological as well. Muriatic acid is chemical, so is bleach. And any vibrations and noises or corrosion are physical.
For the reaction 2 NO₂(g) ⇌ 2 NO(g) + O₂(g) Kp = 1.11 × 10⁻⁵ at 200 °C. A 2.50 L vessel at 200 °C is filled with NO₂(g) at an initial pressure of 4.00 atm and allowed to come to equilibrium. What will be the pressure (in atm) of NO(g) at equilibrium?
The equilibrium pressure of NO is 2.14 atm.
What is equilibrium constant?The equilibrium constant is a numerical value that shows the extent to which reactants are converted into products. We have the reaction 2NO₂(g) ⇌ 2 NO(g) + O₂(g).
We have to set up the ICE table
From PV = nRT
P = nRT/V = 4 * 0.082 * 473/2.5 = 62 atm
2NO₂(g) ⇌ 2 NO(g) + O₂(g)
I 62 0 0
C -x +2x +x
E 62 - x 2x x
Kp = pNO^2 * pO2/pNO2^2
1.11 × 10⁻⁵ = (2x)^2 (x)/(62 - x)^2
1.11 × 10⁻⁵(62 - x)^2 = 4x^3
1.11 × 10⁻⁵(3844 - 124 + x^2) = 4x^3
0.04 - 0.0014x + 1.11 × 10⁻⁵x^2 = 4x^3
4x^3 - 1.11 × 10⁻⁵x^2 + 0.0014x - 0.04 = 0
x = 0.107 atm
Since;
pNO = 2x = 2(0.107) = 2.14 atm
The equilibrium pressure of NO is 2.14 atm.
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Denaye drives 25 km to work every day along the route tgere is a traffic light every 5,000 meters. How many traffic lights does denaye pass on her way to work
Answer:
5
Explanation:
1km = 1,000m
5km = 5,000m = 1 light
25/5 = 5
2 NO(g) + O2(g) → 2 NO2(g)
How many grams of NO2 can be produced when 25.0 g of nitrogen oxide reacts?
25g/30.01g = 0.83 moles
0.83(2/2) = 0.83 moles
0.83*46.005 = 38.2 grams
Answer:
2No+O2 gives 2No2
2 moles of No gives 2 moles NO2
Moles of No= 1.20/30=0.04
Moles = 0.04 ✖ 46=1.8 moles
How fire differ from flame?
[tex]brainlyeveryday[/tex]
Answer:
=> Fire is a rapid oxidation of any substance or material. It is a exothermic chemical process of combustion.
=> Flame is a visible, gaseous region of a fire.
If you repeated this experiment with a different concentration of hydroxide ion, would
you expect to find the same order with respect to crystal violet or a different one?
Briefly explain.
We see the order with respect to crystal violet (m),but no longer the order with respect to hydroxide (n).
Concentration of hydroxide ion equationGenerally the equation for the chemical reaction is mathematically given as
(CV)+(aq) + (OH)-(aq) ------------>. CVOH(aq)
The rate law for the chemical reaction is given as
Rate = k[CV+]m[OH-]n,
Because the hydroxide ion conc is an extra of thousand times as massive as the conc of crystal violet, [OH–] will now not exchange drastically all through this experiment.
Therefore, you will find the order with respect to crystal violet (m),but no longer the order with admire to hydroxide (n).
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which 19th- century art movement most directly influenced the development of abstract art in the 20th century?
A: Realism
B: Romanticism
C: Impressionism
D: Post-Impressionism
Answer:
B.
Thank goodness for all the help you can
Explanation:
Basta
The Linnaean system of classification sorts organisms into groups using a hierarchical system of levels.
List the following terms correctly in the Linnaean classification system from the most general to the most specific.
Order
Phylum
Species
Kingdom
Genus
Name the four states of matter, and a characteristic to describe each.
Answer:
solid particles are tightly held.
liquid particles have perfectly inelastic collisions
gas move in constant random motion
vapour
Which subatomic particle cannot change in an atom?
Proton, Neutron, Electron
Answer: Protons cannot change in an atom because that would change the identity of a particle. Electrons on the other hand can be added or removed creating an ion. Neutrons can also be added or removed to create an isotope.
Balance this equation:
C₂H₂ + O₂
---->
CO2 + H2O
Answer:
Balance The Equation: C2H2 + O2 = CO2 + H2O
1. Label Each Compound With a Variable
aC2H2 + bO2 = cCO2 + dH2O
2. Create a System of Equations, One Per Element
C: 2a + 0b = 1c + 0d
H: 2a + 0b = 0c + 2d
O: 0a + 2b = 2c + 1d
3. Solve For All Variables (using substitution, gauss elimination, or a calculator)
a = 2
b = 5
c = 4
d = 2
4. Substitute Coefficients and Verify Result
2C2H2 + 5O2 = 4CO2 + 2H2O
L R
C: 4 4 ️
H: 4 4 ️
O: 10 10
which of the following spheres is likely to represent a metal atom? WHich
Answer:
Metals lose electrons when reacting with nonmetals, so the red sphere represents a metal.
which of the following substances is formed deep under earth
Answer:
Oil
Explanation:
everything else is above the earth
when acid reacts with Base what result
Strong Acid + Strong Base = Neutral Salt + H2O
Strong Acid + Weak Base = Acidic Salt + H2O
Weak Acid +Strong Base = Basic Salt + H2O
Find the percent nitrogen in ammonium oxide.(Answer = 53.8%)
Answer:
6. 36.7%
Explanation: 7. 21.2% 8. 48%