Answer: Temperature = T, unknown
Saturated Solution, NH4Cl concentration = 60g/100g H2O = 0.6g NH4Cl/g H2O
Assume density of H2O = 1 g/ml
m = 0.6g NH4Cl/g H2O / 1 g/ml
m = 0.6g NH4Cl/ml
See the table of saturated solutions and identify the temperature at which the concentration of NH4Cl is 60g/100g H2O.
Explanation: The line on the graph on reference table G indicates a saturated solution of NH4CL as a concentration of 60. g NH4 Cl/100. g H2O
Why is it necessary to determine if a reactant is limiting reagent in a
reaction?
A. Different products will start being formed once the limiting
reagent is gone.
B. The reaction will not happen if one of the reagents is a limiting
reagent.
C. Stoichiometry cannot be used to calculate amounts if there is a
limiting reagent.
D The amount of product formed will be limited by the amounbof the
limiting reagent.
Answer:
D
Explanation:
Hi!
Let's say you have 2 different reactants, A and B, and 1 product, C.
2A + 4B -> 3C
Let's say that once we do the calculations, we find that A is the limiting reactant/reagent.
All of the A is used up in the reaction, leaving behind some excess B, and forming C.
Now that there is only B left behind, it has nothing to react with, so it cannot create any more product.
I hope this helps!
On a long bus trip, a traveler does
not drink
any water for several hours. How
will the volume of urine she produces that day
compare to the volume on a day when she
drinks several glasses of water? Explain.
Answer:
The volume will be less.
Explanation:
The volume of urine someone produces varies based on their liquid intake. The more liquid you intake, the more you must urinate (not a direct correlation, but basically).
How much energy is gained when a 10.0g sample of liquid water increases in temperature from 13°C to 18°C?
Answer:
Your answer is 209 J.
Explanation:
First find △T by subtraction of two temperatures.
△T = 18°C - 13 °C
= 5°C.
Q=mc△t
where,
m= mass.
c = Specific Heat .
t = temperature.
As, Specific Heat capacity of water is 4.18 J/g°C
= 10 × 4.18× 5
= 209 Joules.
When a 10g sample of liquid water increases in temperature from 13°C to 18°C, then the amount of gained energy is 209 joules.
How do we calculate gained energy?The amount of energy which is gained by any sample will be calculated as:
Q = mcΔT, where
Q = gained energy
m = mass of sample = 10g
c = specific heat of water = 4.18 J/g°C
ΔT = change in temperature = 18 - 13 = 5°C
On putting values we get
Q = (10)(4.18)(5)
Q = 209 Joules
Hence required amount of energy is 209 joules.
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Both mass and weight provide a measure of the amount of matter in an object. Mass is the preferred measure because:
a. mass is independent of location.
b. mass is dependent on location.
c. mass is easier to measure.
d. mass is measured using the metric system.
Answer:
I think it's because mass is independent of location
Answer:
A
Explanation:
mass doesn't change from changes in gravity unlike weight
What is the mole fraction of Ca3(PO4)2 by dissolving 126.32 g of calcium phosphate, Ca3(PO4)2, in 850 grams of H2O?
Based on the total moles of substance in the solution, the mole fraction of Ca3(PO4)2 is 0.0086
What is mole fraction?Mole fraction is the fractions of the moles of a substance present in a given total moles of a mixture.
The mole fraction = moles of substance/total moles of mixtureMoles of Ca3(PO4)2 is calculated first:
Moles of Ca3(PO4)2 = mass/molar mass
molar mass of Ca3(PO4)2 = 310 g
Moles of Ca3(PO4)2 = 126.32/310 = 0.41
Moles of water = 850/18 = 47.22
Total moles = 47.63
Mole fraction of Ca3(PO4)2 = 0.41/47.22 = 0.0086
Therefore, the mole fraction of Ca3(PO4)2 is 0.0086
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For a certain reaction with an average percentage yield of 80 %; if the theoretical yield was 5.0 g then the actual yield will be ?
The actual yield of the reaction is 4.0 g, given that the percent yield of the reaction us 80% and the theoretical yield is 5.0 g.
What is percent yield of a reaction?The percent yield of a reaction is the amount of actual product obtained from a reaction taken as a ratio of the expected amount of product expressed in percentage.
Percent yield = actual yield/theoretical yield × 100%Given that the percent yield of the reaction us 80% and the theoretical yield is 5.0 g.
Actual yield = 80% × 5.0 = 4.0 g
Therefore, the actual yield of the reaction is 4.0 g.
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Nitrogen and hydrogen react to form ammonia. 12dm of hydrogen reacted with excess nitrogen to form 2dm of ammonia. What is the percentage yield of ammonia at room temperature and pressure.
The percent yield shows the extent to which reactants are converted to products. The percent yield of ammonia is 24.7%
Percent yieldThe percent yield is obtained from the theoretical yield and the actual yield. The reaction between hydrogen and Nitrogen is;
3H2 + N2 ---->2NH3
If 1 mole of H2 occupies 22.4 dm^3
x moles occupies 12dm^3
x = 0.54 moles
If 1 mole of NH3 occupies 22.4 dm^3
x moles of ammonia occupies 2 dm^3
x = 0.089 moles
Now;
From the reaction equation;
3 moles of hydrogen yields 2 moles of NH3
0.54 moles of hydrogen will yiled 0.54 moles * 2 moles/3 moles
= 0.36 moles of ammonia
Percent yield = 0.089 moles/0.36 moles * 100 = 24.7%
The percent yield of ammonia is 24.7%
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Consider the entropy change in the following chemical or physical processes:
1.2 Na(s) + Cl₂(g) → 2 NaCl(s)
2. N₂(g) + 3 H₂(g) → 2 NH3(g)
3. H₂O(s)→ H₂O(l)
4. C10H22(1)→ C10H22(S)
5.2 Mg(s) + O₂(g) → 2 MgO(s)
In which of these processes is entropy increased?
Answer:
D
Explanation:
Recall that entropy measures the number of microstates in a substance, which is highest in gases, followed by liquids and solids. Hence, entropy increases if the products have more gaseous molecules than the reactants.
In reaction one, chlorine gas is converted into solid NaCl, so entropy decreaes. In reaction two, four moles of gas are converted into two moles of gas, so entropy decreases. In reaction three, ice is melted to form water, which has higher entropy. Thus, entropy increases. In reaction four, a liquid is freezed into its solid phase, leading to a decrease in entropy. In reaction five, oxygen gas is converted into solid MgO, so entropy decreases.In conclusion, the answer is D.
Jane was drinking a glass of water. She asked her father where the water
came from. Her father said it was groundwater that was pumped up by their
well. Jane wondered what the water looked like underground. This is what
her family said:
Mom: I think it looks like a huge ocean underground.
Dad: I think it looks like a small lake underground.
Jack: I think it seeps into little holes or spaces between the soil and the
rocks.
Annie: I think it looks like a long, underground tube filled with water.
Philip: I think it looks like an underground volcano with water spurting out
of the top.
Which person do you agree with the most
Janes brother Jack is actually correct, underground water seeps into little holes or spaces between the soil and the rocks.
Underground WaterSimply put, underground water is found in between soils and crack, another name for this is called aquifers were water is found.
It should be noted that underground water are found at varying levels depending the terrain.
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measuring masses of the reactants (Reaction 2) Step 7
What is the pH of a solution with a pOH=6.31?
Answer:
pH= 2.199971 is the correct answer of given statement
Migration is _______. a. the movement of organisms from a native location to a foreign location b. the movement of organisms from a foreign location to a native location c. the movement of organisms from their water supply to their food supply d. the seasonal movement of organisms between locations Please select the best answer from the choices provided A B C DMigration is _______. a. the movement of organisms from a native location to a foreign location b. the movement of organisms from a foreign location to a native location c. the movement of organisms from their water supply to their food supply d. the seasonal movement of organisms between locations Please select the best answer from the choices provided A B C D
Answer:
A
Explanation:
Answer:
D is the correct answer. the seasonal movement of organisms between locations
do we need greenhouse gases? explain.
Answer: Yes, we need greenhouse gases. Greenhouse gases are important because they sustain a healthy temperature on our planet. Greenhouse gases absorb heat from the sun and keep it in the atmosphere. The heat emitted by the Earth would pass outwards from its surface into space if greenhouse gases were not active. However, greenhouse gases aren’t just important. They can cause harmful consequences to our environment, too. Letting greenhouse gases into our air causes climate change and respiratory diseases from smog and air pollution.
Explanation:
How many moles are in 7.8 g of acetamide, CH3CONH2?
Answer:
.13 moles
Explanation:
To begin this problem:
First you need to find the molar mass of acetamide, to do so:
C=12g, H=1.008g, O=16g, and N=14g2(12)+5(1.008)+1(16)+1(14)=59.04To find moles when given grams, we divide grams by the molar mass.
7.8g/59.04g/mol=.13 molesUsing 2 sig figs from what we are given, this is our final answer.
pls help me with thiss
Answer:
D. Large body of lava
Explanation:
hope this helps please mark me brainless
2. Which is not true of an electric current?
A. An electric circuit provides a path for electric current to follow.
B. Electric current exists in all materials.
C. Electric current requires a specific path to follow.
D. If an electric circuit is broken, electric current will not flow.
A 53.8 g sample is burned in a bomb calorimeter. If the temperature rose from 32.0 oC to 56.0 oC and the heat capacity of the calorimeter is 13.3 kJ/oC, what is the value of ΔHrxn (in kJ/mole of sample)? The molar mass of the sample is 56.23 g/mol.
Based on the heat absorbed by the calorimeter, the heat of reaction, ΔHrxn is 333.5 kJ/mol
What is the heat evolved by the sample?The heat evolved or given out by the sample is the equal to the amount of heat absorbed by the calorimeter.
The heat absorbed by calorimeter is given as:
Heat = specific heat capacity × temperature differenceHeat = 13.3 × (56.0 - 32.0)
Heat evolved = 319.2 kJ
Moles of sample reacted = 53.8/56.23 = 0.957
ΔHrxn = 319.2 kJ/0.957 moles = 333.5 kJ/mol
Therefore, the heat of reaction, ΔHrxn is 333.5 kJ/mol.
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How many times more soluble is scandium fluoride in pure water than it is in a solution that is 0.00837 M in potassium fluoride? ScF3 (s) <---> Sc3+ (aq) + 3 F- (aq), Ksp = 5.81 x 10-24.
Scandium fluoride is 1.56 * 10¹¹ times more soluble in pure water than it is in a solution that is 0.00837 M in potassium fluoride.
What is the molar solubilty of scandium fluoride in pure water and in 0.00837 M potassium fluoride?The molar solubilty of scandium fluoride in pure water and in 0.00837 M potassium fluoride is calculated from the Ksp value of Scandium fluoride.
Equation for the dissolution of scandium fluoride in water is given below:
[tex]ScF_3 \rightleftharpoons Sc^{3+} + 3F^{-}[/tex]Molar solubilty in pure water is calculated thus:
[tex][Sc^{3+}] = x; [F^{-}] = x[/tex]
[tex]K_{sp} = [Sc^{3+}] * [F^{-}]^{3}[/tex]
[tex]5.81 *10^{-24} = x * x^{3} = x^{4}[/tex]
x = 1.55 * 10⁻⁶ M
Molar solubilty in 0.00837 M potassium fluoride is calculated thus:
[tex][Sc^{3+}] = x; [F^{-}] = (0.00837 + x)[/tex]
[tex]K_{sp} = [Sc^{3+}] * [F^{-}]^{3}[/tex]
[tex]5.81 *10^{-24} = x * (0.00837 + x)^{3}[/tex]
Since the Ksp value is very small, we assume that x <<< 0.008367, therefore;
[tex]5.81 *10^{-24} = x * (0.00837)^{3}[/tex]
x = 9.91 * 10⁻¹⁸ M
Comapring the molar solubilties in water and in 0.00837 M in potassium fluoride:
1.55 * 10⁻⁶ M/9.91 * 10⁻¹⁸ M = 1.56 * 10¹¹
Therefore, scandium fluoride is 1.56 * 10¹¹ times more soluble in pure water than it is in a solution that is 0.00837 M in potassium fluoride.
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write any five prevention of cancer
Answer:
Don't use tobacco or tobacco-containing products
Maintain a healthy diet
Protect yourself from the sun, make sure to use sunscreen
Go to the doctor regularly, for general checkups
Stay physically active
Explanation:
hope this helps :)
what is the heat of fusion of water in calories per mole? Answer with explanation
Answer:
1436.2 calories per mole H2O
Explanation:
one mole of water has mole weight of 2 * H + O =
2 * 1.008 + 15.999 = 18.015 gm
the heat of fusion for water (the heat required to turn ice to water )
is 79.72 cal/gm
18.015 gm * 79.72 cal/gm = 1436.2 cal
(2 Question 6 Without modifying the apparatus, how could the reliability of the results be increased?
Explanation:
Reliability can be improved by completing each temperature more than once and calculating an average.
Do you think precipitation has a greater impact on the rate of chemical weathering or mechanical weathering? Explain
Greater rainfall has an greater increase on the rate of chemical weathering. Rain is a form of precipitation.
Isocyanic acid, also known as Hydrogen cyanate, is a weak acid and a potentially toxic atmospheric pollutant. Write down the equation for the dissociation of isocyanic acid in water. Explain the term conjugate base and state the correct conjugate base of isocyanic acid. Give a reason for your answer.
The dissociation of isocyanic acid in water produces its conjugate base, C N- since it will accept a proton to form isocyanic acid.
What is a conjugate base?A conjugate base is a substance which is formed from the loss of the hydrogen ion of an acid and which will act as a base by accepting a proton.
The dissociation of Isocyanic acid in water is given below:
[tex]HC N + H_2O \rightleftharpoons C N^{-} + H_3O^{+}[/tex]
The conjugate base is C N- since it will accept a proton to form isocyanic acid.
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What is the distinguishing characteristic of invertebrates?
Group of answer choices
Specialized tissues and organ systems
The lack of a centralized brain
The lack of a spinal column
Being an insect
The lack of a spinal column is the distinguishing characteristic of invertebrates.
What is an Invertebrate?These are organisms which lack a backbone(vertebral column) while vertebrates on the other hand have it.
This is why option C was chosen as the most appropriate choice in this scenario.
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What is the product of photosynthesis that plants make as a source of energy for their life functions? What role does this substance have in your life?
Answer:
Glucose. Also provides heat and energy in man
Explanation:
I hope this right if ain't I'm sorry
Why does the moon and the sun have the same mass.
Why does the moon and the sun have the same mass?
Answer: The difference is that, on the moon, you are much lighter than on the Earth, but you still have the same mass
Which combination of reactants will cause a reaction? Choose all that apply.
NaCl and Fe
Br2 and KI
Mg and AlCl3
Zn and CuCl2
Answer:
mass of sodium hydroxide is needed to react completely with 10.0 g of iron(III) chloride
Explanation:
Please help!!
How many O2 molecules occupy a 1.0 L flask at 65°C and
103.7 kPa?
Select one:
O a. 28 molecules
O b. 2.2 x 1022 molecules
O c.
1.1 x 1023 molecules
O d.
1.6 x 1025 molecules
e. 1.7 x 1025 molecules
Answer:
B, 2.22×10^22 molecules
Explanation:
Given PV=nRT, n=PV/RT
n=103.7×1.0/8.314×(65+273.15)
= 0.0368858... moles
Given n= number of particles/avogadros number
number of particles=n×avogadros number
number of particles = 0.03688...×6.02x10^23
= 2.22×10^22 molecules
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True
False
What is the final temperature of a system if 18.00 g of gold at 90.0°C is placed in 18.00 g of water at 26.00°C? The molar heat capacity of gold is 25.41
J/(mol • °C) and the heat capacity of water is 4.18 J/g. °C).
Given,
Molar heat capacity of gold is 25.41 J/(mol • °C)
Heat capacity of water is: 4.18 J/g. °C)
use the capacities to calculate the resultant temperature of the system using the mass of 18 grams of gold alongside 18 grams of water.
Hope This Helped!