Answer:
359
i think
Explanation:
One use of CaCl2 is for salting roads in the winter. How much would the freezing point of water decrease if a 3.23 molal (m) solution of CaCl2 were applied? (Kf = 1.86°C/(mol/kg) for water and i = 3 for CaCl2.)
Answer:
Freezing point of water will decrease to -18.02°C
Explanation:
We start from the formula for freezing point depression, one of the colligative properties.
ΔT = Kf . m . i
ΔT = Freezing T° of pure solvent - Freezing T° of solution
m = molality
Kf = Cyoscopic constant (specific for each solvent)
i = numbers of ions dissolved (Van't Hoff factor)
CaCl₂ → Ca²⁺ + 2Cl⁻ i = 3
We replace each data:
0°C - T° F) = 1.86°C/m . 3.23 m . 3
T°F = - 18.02°C
what are two products that contain ammonia?
when pressure is kept constant then the temperature varies with volume
a. directly
b. inversely
c. none of these
d. both a and b.
Answer:
A
Explanation:
Identify three sources of point-source pollution.
What causes the ocean tides to change from high tide to low tide?
When 1 mol of Zn reacts with 0.8 mol of HCI, which of the following will be true?
Answer:
Zn is the excess reagent
Explanation:
H2CO3 -> H2O + CO2 What type of chemical reaction is taking place in this
chemical equation? *
O Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion
Answer: decomposition
Explanation: one molecule forms tro molecules
How many grams of NaCl are in 3.5 mol of NaCl? Also, how many moles of NaCl are in 150 g of NaCl?
Answer:
204.5505 grams
2.5666 moles
Explanation:
For the first question, multiply 3.5 (# of moles) by 58.443 (g/mol for NaCl).
58.443 * 3.5
I'll distribute 3.5 into 58.443.
(3.5 * 50) + (3.5 * 8) + (3.5 * 0.4) + (3.5 * 0.04) + (3.5 * 0.003)
175 + 28 + 1.4 + 0.14 + 0.0105
203 + 1.4 + 0.14 + 0.0105
204.4 + 0.14 + 0.0105
204.54 + 0.0105
204.5505 grams
There are 204.5505 grams in 3.5 moles of NaCl.
For the second question, divide 150 (# of grams) by 58.443 (g/mol for NaCl). I'll convert both into fractions.
150/1 * 1000/58443
150000/58443
2.56660336 moles
2.5666 moles (rounded to 4 places to keep consistency with the first answer) are in 150 grams of NaCl.
The process of energy being captured
by plants from the sun and then
transferred from one organism to the
next in the food chain is called
A food flow
B energy flow
C nutrient flow
D water flow
Answer:
B
Explanation:
I am not sure but I think it is B. Out of all the answers that one makes sense.
Raise the temperature of 2 g of water 2°C.
Answer:
This heat requirement we can calculate by following relationship..
Q = m*C*∆T
We have, m = 2gm, C = 1 cal/g-degC, ∆T = 2 degC
Putting all these values in above equation we get
Q= 2*1*2 = 4 cal
why would a metal house not be a good idea in Florida or Alaska?
Answer: Maybe, It could be a good and bad idea.
Explanation:
This is beacuse Metal does not absorb and can block sunlight.
Which of the following statements correctly describes the relationship between volume and temperature( moles and pressure of gas are constant)
Answer:
pressure of gas are constant describe the relationship between moles and temprature
The statements correctly describes the relationship between volume and temperature is pressure of gas are constant.
What is pressure ?The force delivered perpendicularly to an object's surface per unit area across which that force is dispersed is known as pressure. In comparison to the surrounding pressure, gauge pressure is the pressure. Pressure is expressed using a variety of units.
The volume of a gas is directly proportional to the number of moles of gas when both temperature and pressure are constant. The pressure of a gas is directly proportional to the number of moles of gas when both temperature and volume are constant.
In layman's words, the volume of a fixed mass of gas is exactly proportional to temperature at constant pressure.
Thus, If the pressure and temperature remain constant, the volume of a gas is directly proportional to the number of moles in the gas.
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A scientist is investigating which type of medicine would dissolve faster, a solid pill or a scoop of powder. Which hypothesis
should the scientist develop given prior knowledge about surface area?
A. Solid pills have more surface area and will take longer to dissolve.
B. Powders have less surface area and will dissolve faster.
C. Solid pills have less surface area and will not dissolve.
D. Powders have more surface area and will dissolve faster.
B.
because a solute with a smaller surface area will dissolve faster
11) How many grams are in 2.3 moles of magnesium chloride, MgCl,?
Answer:
218.98 grams
Explanation:
Given that,
No. of moles, n = 2.3
The molar mass of magnesium chloride is 95.211 g/mol.
We need to find the mass of 2.3 moles of magnesium chloride.
We know that,
No. of moles = given mass/molar mass
Let m be the given mass. So,
[tex]m=n\times M\\\\=2.3\times 95.211 \\\\=218.98\ g[/tex]
So, the required mass is equal to 218.98 grams.
How many moles of methane gas are required when there are 7.55 grams of oxygen gas available? Please someone explain how to solve this problem, I would really appreciate it.
Answer:
0.236 moles of methane gas are required when there are 7.55 grams of oxygen gas available.
Explanation:
The balanced reaction is
CH₄ + 2 O₂ → CO₂ + 2 H₂O
By reaction stoichiometry (that is, the ratio of reactants and products in the reaction), the following amounts of moles of each compound participate in the reaction:
CH₄: 1 mole O₂: 2 moles CO₂: 1 mole H₂O: 2 molesBeing the molar mass of each compound:
CH₄: 16 g/mole O₂: 32 g/moleCO₂: 44 g/mole H₂O: 18 g/moleThen, by reaction stoichiometry, the following mass amounts of each compound participate in the reaction:
CH₄: 1 moles* 16 g/mole= 16 gramsO₂: 2 moles* 32 g/mole= 64 gramsCO₂: 1 mole* 44 g/mole= 44 grams H₂O: 2 moles* 18 g/mole= 36 gramsSo, you can apply the following rule of three: if by reaction stoichiometry 64 grams of oxygen react with 2 moles of methane, 7.55 grams of oxygen react with how many moles of methane?
[tex]moles of methane=\frac{7.55 grams of oxygen*2 moles of methane}{64 grams of oxygen}[/tex]
moles of methane= 0.236
0.236 moles of methane gas are required when there are 7.55 grams of oxygen gas available.
what happens to halogens on going top to bottom in their group
they remain as they are and don't change their type
A solution with a pOH level of 9.2 would be considered as a basic, acidic, or neutral.
Answer:
It would be Basic.
Explanation:
The higher the number, the more basic it is.
Answer:
its basic solution
Explanation:
b/c the pH value greater than7 base
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Is the formation of CO2(g) from its elements endothermic or exothermic?
Exothermic because the ΔH is negative.
Endothermic because the ΔH is negative.
Endothermic because the ΔH is positive.
Exothermic because the ΔH is positive.
Answer: Exothermic because the ΔH is negative.
Explanation:
The standard enthalpy of formation or standard heat of formation of a compound is the change of enthalpy during the formation of 1 mole of the substance from its constituent elements, with all substances in their standard states.
[tex]C(s)+O_2(g)\rightarrow CO_2(g)[/tex]
Exothermic reactions are those reactions in which heat is released and [tex]\Delta H[/tex] is negative.Endothermic reactions are those reactions in which heat is absorbed and [tex]\Delta H[/tex] is positive.
The reaction is exothermic as the heat is released during the formation of [tex]CO_2[/tex] as heat of formation of [tex]CO_2[/tex] is negative.
plz help me.....im new here
Answer:
Fe2S3
Explanation:
Answer:
Option 3rdFe2S3
Explanation:
As, the ionic valency of Iron (Fe) that is + 3 interchanges with the ionic valency of Sulphide that is - 2 to form-
Fe2S3
What is one definition of a base?
O A. A substance that increases the hydroxide ions in a solution
B. A substance that forms a salt when it dissolves in water
O C. A substance that stops the flow of electrons when dissolved
O D. A substance that makes the pH of a solution more acidic
Answer:
the answer is A
Explanation:
The base increases Hydroxide ions in a solution e.g NaOH
Answer:
A
Explanation:
How many grams are in 1,000 Lutheran of C2H4
Answer:
28.05316 grams
Explanation:
Assuming that the trends continue, which of the following compound will have the greatest solubility at 120 ℃? The graph below shows the solubility of a variety of compounds.
A. Ce2(SO4)3
B. K2Cr2O7
C. NaCl
D. Pb(NO3)2
Answer:
its c
Explanation:
i took the test and got a 100
Assuming that the trends continue, sodium chloride compound will have the greatest solubility at 120 ℃.
What is solubility?Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.
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Nevada's annual precipitation averages between 21 and 24 cm. In comparison,Washington state averages between 96 and 97 cm of precipitation per year. Which of these factors has the greatest impact on the difference in precipitation between these two states?
Answer:
Mountain ranges and prevailing winds.
Explanation:
Mountain ranges and prevailing winds are the factors that is responsible for the difference in the precipitation between Nevada and Washington states. The Washington state is located along the coastal region of pacific ocean and having more mountain ranges which causes more rainfall in that region while on the other hand, Nevada state comprise of plateau, basins and far away from the ocean which is the main cause of lower rainfall as compared to Washington state.
what is the oceanic and continental crust made out of ?
Answer:
Oceanic crust is generally composed of dark-colored rocks called basalt and gabbro. It is thinner and denser than continental crust, which is made of light-colored rocks called andesite and granite. The low density of continental crust causes it to “float” high atop the viscous mantle, forming dry land.
Explanation:
3. Components in a heterogeneous mixture are not in the same phase or the composition of the mixture is
a) uniform
b) transparent
c) uneven
4. Mixing sand and salt in water then passing it through a filter separates out the sand because salt
in water and sand does not.
a) reacts
b) dissolves
c) disappears
Answer:
c
Explanation:
A given sample of gas has a volume of 5.20 L at 60.°C and 1.00 atm pressure. Calculate its pressure if the volume is changed to 6.00 L and the temperature to 27°C (assume the amount of gas does not change)
Answer:
0.78 atm
Explanation:
Applying general gas equation
PV/T= P'V'/T'................ Equation 1
Where P = initial pressure, T = Initial temperature, V = Initial Volume, P' = Final pressure, V' = Final Volume, T' = Final Temperature.
make P' the subject of the equation
P' = PVT'/TV'.............. Equation 2
From the question,
Given: P = 1.00 atm, V = 5.20 L, T = 60°C = (273+60) = 333K, V' = 6.00 L, T' = 27°C = (27+273)K = 300 K
Substitute these values into equation 2
P' = (1×5.2×300)/(333×6)
P' = 1560/1998
P' = 0.78 atm.
If you have 5 moles of carbon dioxide at 30degrees C and under 600mmHg of pressure, what will the volume be
Answer:
157.64 L
Explanation:
We'll begin by converting 30 °C to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
T(°C) = 30 °C
T(K) = 30 °C + 273
T (K) = 303 K
Next, we shall convert 600 mmHg to atm. This can be obtained as follow:
760 mmHg = 1 atm
Therefore,
600 mmHg = 600 mmHg × 1 atm / 760 mmHg
600 mmHg = 0.789 atm
Finally, we shall determine the volume of the gas. This can be obtained as follow:
Number of mole (n) = 5 moles
Temperature (T) = 303 K
Pressure (P) = 0.789 atm
Gas constant (R) = 0.0821 atm.L/Kmol
Volume (V) =?
PV = nRT
0.789 × V = 5 × 0.0821 × 303
0.789 × V = 124.3815
Divide both side by 0.789
V = 124.3815 / 0.789
V = 157.64 L
Therefore, the volume of the gas is 157.64 L
what is the nature of salt which is formed by the combination of weak acid and strong base And have a great day ❤️
Which has the most gravitational potential energy- a 10 kg ball that is 2 meters high or a 10 kg ball that is 4 meters high?
Answer:
The 10 kg ball that is 4 meters high is greater than a 10 kg ball that is 2 meters high
Explanation:
From the question,
Gravitational Potential Energy of the first ball
P.E1 = mgh.................... Equation 1
Where P.E1 = Gravitational Potential Energy of the first ball, m = mass of the first ball, h = height of the first ball, g = acceleration due to gravity.
Given: m = 10 kg, h = 2 m
Constant: g = 9.8 m/s²
Substitute these values into equation 1
P.E1 = 10×2×9.8
P.E1 = 196 J.
Similarly,
Gravitational potential energy of the second ball is
P.E2 = m'gh'................... Equation 2
Where P.E2 = Gravitational potential Energy of the second ball, m' = mass of the second ball, h' = height of the second ball.
Given; m' = 10 kg, h' = 4 m
Substitute these values into equation 2
P.E2 = 10×4×9.8
P.E2 = 392 J
From the above calculation,
P.E2 is greater than P.E1.
Hence, the 10 kg ball that is 4 meters high is greater than a 10 kg ball that is 2 meters high
Calculate the [H3O+] of an aqueous solution that is 1.94 x 10-7 Min OH.
Enter your answer in scientific notation. Be sure to answer all parts.
_x 10^_M