Answers
Answer:
2
Explanation:
At the constant temp, the substance is going from a solid to a liquid and both are present (like melting ice)
Related Questions
Which of the following statements correctly describe the molality and molarity of a solution? Select all that apply.For a dilute aqueous solution molality and molarity are nearly equal.Both molarity and molality express concentration in terms of moles of solute.M must be calculated using the volume of the solution, not the volume of the solvent.
Answers
In terms of solute moles, molarity and molality both represent concentration. The volume of the solution, not the volume of the solvent, must be used to determine.
In an aqueous solution, are molarity and molality equivalent?While a solution's molarity is determined by the moles of solute divided by the volume of the solution in litres, a solution's molality is determined by the moles of solute divided by the mass of the solvent in kilogrammes.
When are a solution's molarity and molality almost the same, and how is their value affected by temperature change?Molarity is the number of moles of solute dissolved in one litre of solution, whereas moles of solute per thousand grammes of solvent is known as molality. Molality is not temperature-dependent, however, molarity changes when the temperature changes because the volume does.
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rank the following compounds in order of increasing acidity (least to most acidic) using the periodic table. start with the least acidic compound at the top of the list. h2s sih4 ph3
Answers
The following compounds should be ranked in order of increasing acidity, starting with the least acidic compound at the top: SiH4, H2S, PH3.
Analysis of each compound:SiH4 is the least acidic compound, as it is a covalent hydride that is unlikely to produce a hydrogen ion in water. H2S is more acidic than SiH4, as it is a molecular hydride that can form hydrogen ions when dissolved in water. PH3 is the most acidic compound, as it is a molecular hydride with a high degree of polarity, which allows it to easily donate a hydrogen ion when dissolved in water.Learn more about acidity compounds:
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A buffer was prepared by mixing 1.00 mole of ammonia and 1.00 mole of ammonium chloride to form an aqueous solution with a total volume of 1.00 liter. To 500 mL of this solution was added 30.0 mL of 1.00 M NaOH. What is the pH of this solution?
Answers
Answer:
Idek sorry
Explanation:
So sorry i think its 1.00
A scientist was asked to test the effect of a new vitamin for rats. His
hypothesis was that young rats that had vitamins added to their food would
gain weight faster than young rats fed a normal diet. He predicted that if
young rats were fed vitamins, then they would gain more weight by the end of
the experiment. He tested the effect of adding vitamins to some of the rats'
diet by measuring the amount of weight each rat gained after three months.
He then determined the average weight gained in each group. To analyze his
results, he put the data he collected into the table shown below.
What did the data show about the hypothesis?
• A. The data did not test the hypothesis.
• B. There was not enough data to support or reject the hypothesis.
• C. The data rejected the hypothesis.
• D. The data supported the hypothesis.
Answers
Answer:
D. The data supported the hypothesis
Explanation:
The data shows that rats fed a normal diet with the addition of vitamins gained a higher average weight gain in the period of 3 months, compared to rats fed a normal diet. This supports the scientists' hypothesis of "Young rats that had vitamins added to their food would gain weight faster than young rats fed a normal diet."
Which family correctly represents the element in group 1 on the periodic table
Answers
Answer:
Alkali Metals
Explanation:
I used Google
Answer:
Alkali metals
Explanation:
What variable must be held constant to use the combined gas law?
a. mass of gas sample
b. number of moles of gas
c. number of gas molecules
d. all of the above
e. none of the above
Answers
Answer:
The answer is (e) none of the above. The combined gas law relates the pressure, volume, and temperature of a gas, so all three variables (pressure, volume, and temperature) must be considered and at least one of them should be held constant to use the combined gas law. The mass of the gas sample, number of moles of gas, and number of gas molecules are not directly related to the combined gas law.
Which element is shown below? How do you know?
Answers
6. How many moles are in 8.30 x 1023 molecules of CO₂?
a.
b.
C.
d.
1.37
2.8
55.5
100
Answers
Calculate the emf of the following concentration cell: Au(s) | Au3+ (0.10 M) || Au3+ (0.50 M) | Au(s)
Answers
The emf of the cell as written is calculated to be 0.014 V.
Using the Nernst equation;
Ecell = E°cell - 0.0592/n log Q
We must note that E°cell = 0 because the anode and cathode are composed of the same type of metal.
Now;
Substituting values, we have;
Ecell = 0 - 0.0592/3 log (0.50 M)/(0.10 M)
Ecell = 0.014 V
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4.Using their general formula, CnH2n-2 derive the molecular formula of the alkynes when n = 5, 6, 7, 8)
5.Write the condensed structural formula of the molecules in #4.
Answers
C₅H₆ is the first pentyne, C₆H₁₂ is the first hexyne, C₇H₁₀ is the first heptyne,
C₈H₁₂ is the last pentyne (this is 1-octyne). pentyne: 1-Butyne, hexyne: 3-methylpentane, heptyne: 3,3-dimethylbut-1- ene, and octyne: 5-(2-methylpropyl)-decane
Alkynes have the generic formula :Alkynes are hydrocarbons with at least one triple bond between two carbon atoms. Alkynes have the general formula. Alkyne must contain at least two carbon atoms, much like alkene.
What does the general formula represent?The -ane ending in the name indicates that the substance is an alkane. Methane, ethane, propane, butane, pentane, hexane, heptane, and octane are the names of the alkanes. The general formula for alkanes.
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alculate the specific heat of the metal, if the heat the water absorbed was 424.7 J.
Answers
Answer:
424.7J-312J=the specific amount of heat passing through the metal
How many grams of LiOH are needed to make 25 mL of a 0.125 M solution?
Please explain because I have no idea how to solve this
Answers
Answer:
0.0734 grams LiOH
Explanation:
The molarity formula looks like this:
Molarity (M) = moles / volume (L)
You are given the molarity and volume (in mL). Therefore, you can plug these values into the equation and solve for moles (after you convert from mL to L).
25 mL / 1,000 = 0.025 L
0.125 M = moles / 0.025 L
(0.125 M) x (0.025 L) = moles
0.003125 = moles
After using the molarity formula, we know that 0.003125 moles LiOH are needed to satisfy these conditions. Now, we can convert this to grams using the molar mass of LiOH. This can be determined using the values from the periodic table. Remember to write your conversion in a way that allows for the units to cancel out.
Molar Mass (LiOH) = 6.941 g/mol + 16.00 g/mol + 1.008 g/mol
Molar Mass (LiOH) = 23.499 g/mol
0.003125 moles 23.499 g
------------------------ x ------------------- = 0.0734 grams LiOH
1 mole
0.074 grams of lithium hydroxide are needed to make 25 ml of 0.125 M solution, according to the concept of molar concentration.
What is molar concentration?
Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.
Here , in the problem mass is to be determined, hence the formula used is the first one mentioned.
Substituting values in the formula,mass=molar concentration×molar mass×volume in liters
∴0.125×23.95×0.025=0.074 g.
Hence, 0.074 g of lithium hydroxide are required to prepare 25 ml of 0.125 M solution.
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f the efficiency of a machine increases, what happen
Answers
If the efficiency of a machine increases, it means that the machine is able to convert a higher percentage of its input energy into useful work output.
This could happen due to various factors, such as reducing friction, improving the design of the machine, or using more efficient components. The machine requires less energy input to perform the same amount of work. This could result in cost savings, reduced energy consumption, and lower environmental impact.
The output of the machine increases while the input remains constant. This could result in increased productivity, faster production rates, and improved performance. The wear and tear on the machine may decrease, as it is working more efficiently and experiencing less stress. This could result in longer machine life and reduced maintenance costs. Increasing the efficiency of a machine can have many positive effects, including cost savings, improved performance, and reduced environmental impact.
The complete question is
If the efficiency of a machine increases, what happen?
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How many mL of CH3OH are present in a 17.1 v/v% solution which also contains 320 mL of water?
Do not include units in your answer.
Answers
To calculate this, we need to understand that a 17.1 v/v% solution means that there are 17.1 mL of CH3OH in every 100 mL of solution.
Therefore, we can set up the following equation:
17.1 mL CH3OH / 100 mL solution = x mL CH3OH / (x mL CH3OH + 320 mL H2O)
Solving for x, we get:
x = (17.1/100) * (x + 320)
0.171x + 54.72 = x
0.829x = 54.72
x = 66.05 mL
However, we need to subtract the volume of water, so:
x - 320 = 66.05 - 320 = -253.95 mL
Since we can't have a negative volume, we know that there must have been an error in our calculations. This is because we can't have a solution with less than 0 mL of CH3OH.
Going back to the equation, we can see that the problem comes from assuming that the volume of the solution is 100 mL. Instead, we need to assume that there are 100 mL of the solution + 320 mL of water, for a total of 420 mL. The equation then becomes:
17.1 mL CH3OH / 100 mL solution = x mL CH3OH / 420 mL
Solving for x, we get:
x = (17.1/100) * 420
x = 71.82 mL
Subtracting the volume of water, we get:
71.82 mL - 320 mL = -248.18 mL
Again, this is negative. The error this time is due to assuming that the volume of the solution is 420 mL, when it's actually the sum of CH3OH and water volumes.
To correct this, we need to recognize that the volume of the solution is the sum of the CH3OH and water volumes. Using the equation above, we can solve for the volume of the solution:
17.1 mL CH3OH / 100 mL solution = x mL CH3OH / V mL solution
Solving for V, we get:
V = (x / 0.171) * (100 / 1)
V = 39.77 mL CH3OH
The volume of water is given as 320 mL. Therefore, the volume of the solution is:
V + 320 = 39.77 mL + 320 mL = 359.77 mL
Finally, we can use the volume percentage to calculate the amount of CH3OH in mL:
17.1 mL CH3OH / 100 mL solution = x mL CH3OH / 359.77 mL solution
Solving for x, we get:
x = (17.1/100) * 359.77
x = 61.54 mL
Therefore, there are 61.54 mL of CH3OH in the solution.
Why is the mass of Lithium listed on the periodic table 6.941 and not 6 or 7?
Answers
What is atomic radius and how is this value obtained
Answers
Answer:
Atomic radius is the radius of an atom. It can be attained through measuring the radius of an atom in a variety of bonds and averaging them to get it.
Explanation:
Calculate the pH for the following concentration: [H3O+] = 5.77 x 10-7 M
Answers
The pH of a solution with a concentration of 5.77 x 10-⁷ M is 6.24.
How to calculate pH?pH refers to the quantitative measure of the acidity or basicity of aqueous or other liquid solutions.
The pH of a substance can be calculated using the following expression:
pH = -log H
Where;
H = concentration of acidAccording to this question, the concentration of a solution is 5.77 × 10-⁷M. The pH can be calculated as follows:
pH = - log 5.77 × 10-⁷M
pH = 6.24
Therefore, 6.24 is the pH of the solution
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What is the correct mole to mole ratio for Aluminum to Aluminum chloride in the following reaction: 2Al + 3Cl2 --> 2AlCl3
2 ;2
3 ; 2
2 ; 3
6 ; 2
Answers
Answer:
3;2
Explanation:
The enthalpy of vaporization of Substance X is 13.0kJmol and its normal boiling point is −75.°C. Calculate the vapor pressure of X at −115.°C.
Round your answer to 2 significant digits.
Answers
The vapor pressure of Substance X at -115.°C is 0.21 atm if the enthalpy of vaporization of Substance X is 13.0kJmol and its normal boiling point is −75.°C.
To tackle this issue, we want to utilize the Clausius-Clapeyron condition:
ln(P2/P1) = (- ΔHvap/R) * (1/T2 - 1/T1)
where P1 and T1 are the fume tension and temperature at the realized limit, P2 and T2 are the fume strain and temperature at the obscure point, ΔHvap is the enthalpy of vaporization, and R is the gas consistent.
To start with, we want to change the temperatures over completely to Kelvin:
T1 = 198.15 K (limit at - 75°C)
T2 = 158.15 K (given)
Then, we can connect the qualities and address for P2:
ln(P2/1 atm) = (- 13.0 kJ/mol/8.314 J/(mol*K)) * (1/158.15 K - 1/198.15 K)
ln(P2/1 atm) = - 1.568
P2/1 atm =\(e^(- 1.568)\)
P2 = 0.21 atm
The Clausius-Clapeyron condition can be utilized to work out the fume strain of a substance at an obscure temperature utilizing its known enthalpy of vaporization and fume tension at a known temperature. By connecting the qualities and settling, we get a fume strain of 0.21 atm for Substance X at - 115°C. Accordingly, the fume strain of Substance X at - 115.°C is 0.21 atm.
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1.8 (a) How many significant figures should be reported for the
volume of the metal bar shown here? (b) If the mass of the bar
is 104.72 g, how many significant figures should be reported
when its density is determined using the calculated volume?
[Section 1.5]
2.5 cm
1.25 cm
5.30 cm
Answers
B-102.6 kg
1.5 2.8
2.9
3.7~
The volume of the metal bar should be reported in two significant figures and the density of the metal bar should be reported in two significant figures.
What are significant figures?Significant figures are used to create numbers that can be written in the form of digits. We can find the number of significant digits by counting the values from the first non-zero digit placed on the left.
In the case of division or multiplication, the number of the significant digit should be the same as the value with the fewest significant digits figures.
Given the sides of the metal bar, a = 2.5 cm , b = 1.25 cm and c = 5.30 cm
The volume of the metal bar = 2.5 ×1.25 × 5.30 = 16.5625 cm³
The fewest significant figures in the dimension are two. Therefore, the volume of the metal bar will be written in 2 significant figures.
The volume in the metal bar = 17 cm³
Given the mass of the bar is equal to 104.72 g.
The density of the metal bar = 17 cm³
The density of bar = mass/volume = 104.72/17 = 6.16 g/cm³
The density of metal bar = 6.2 g/cm³ (2 significant figures)
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How do you think the electrons, and the way the electrons are bonded or transfered,
affect how the two compounds dissolve?
Answers
Answer:
the electron will be drawn more toward the atom with the higher e lectronegativity resulting in a polar covalent bond.
Explanation:
When atoms of different elements share electrons through covalent bonding, the electron will be drawn more toward the atom with the higher e lectronegativity resulting in a polar covalent bond. When compared to ionic compounds, covalent compounds usually have a lower melting and boiling point, and have less of a tendency to dissolve in water.
Help me pls ima faill plss
Answers
Answer:
C3H8 + 5O2 = 3Co2 + 4 H2o
Explanation:
we can balance this equation by algebric method ( ABC method)
A 40.80 gram sample of copper is heated in the presence of excess sulfur. A metal sulfide is formed with a mass of 51.09 g. Determine the empirical formula of the metal sulfide.
Answers
Answer:
Cu₂S
Explanation:
From the question,
Cu S
Mass: 40.80 g 51.09-40.80 = 10.29 g
Mole ratio: 40.80/63.5 10.29/32.1
0.64 : 0.32
Divide by the smallest,
0.64/0.32 : 0.32/0.32
2 : 1
Therefore,
Empirical formula = Cu₂S.
You are given an unknown substance to identify. After making careful observations, you determine that the substance is brittle, dull in appearance, and does not conduct heat. Based on your observations, which of the following most likely describes the unknown substance?
Group of answer choices
Answers
Answer: a nonmetal
Explanation: your welcome
Write and balance the following equation:
zinc (II) nitrate + copper
→ copper (1) nitrate + zinc
Answers
Answer:
This reaction will not occur since copper is less reactive than zinc.
Explanation:
Since copper is located at a lower position in the reactivity series than zinc, there will be no displacement reaction if copper is put into zinc (II) nitrate solution.
what is the metric unit of work
Answers
Answer:
newton-meters or (N-m)
Explanation:
How many grams of silver will be produced from 5.00 grams of copper and 1.00 gram of silver nitrate?
Cu + 2AgNO3 --> 2Ag + Cu(NO3)2
O .2299
O.635 g
O 2.38 g
O 3.86
Answers
mole Cu = 5 : 63.5 g/mole = 0.079
mole AgNO₃ = 1 : 170 g/mole = 0.0058
AgNO₃ as a limiting reactant
So mole Ag = mole AgNO₃ = 0.0058
mass Ag = 0.0059 x Ar Ag = 0.00588 x 108 g/mole = 0.635
What is N for silicon tetrachloride, SiCl4?
Answers
When equal masses of ice and liquid water receive the same amount of energy without a change in state the ice changes temperature faster than the liquid water does because the
Answers
The ice changes temperature faster than the liquid water does because the specific heat of ice is less than the specific heat of liquid water. Thus, option 1 is correct.
What is specific heat?The amount of heat needed to raise a substance's temperature by one degree Celsius in one gramme is known as its specific heat. Calories or joules per gramme per degree Celsius are frequently used as the units of specific heat. For instance, water has a specific heat of 1 calorie (4.186 joules) per gramme per degree Celsius.
The concept of specific heat was developed by the Scottish scientist Joseph Black in the 18th century as a result of his observation that equal masses of various substances required different amounts of heat to raise them through the same temperature range. French physicists Pierre-Louis Dulong and Alexis-Thérèse Petit showed in the early 19th century that measurements of a substance's specific heat allow one to calculate their atomic weights.
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Complete question:
When equal masses of ice and liquid water receive the same amount of energy, without a change in state, the ice changes temperature faster than the liquid water does because the
(1) specific heat of ice is less than the specific heat of liquid water
(2) specific heat of ice is greater than the specific heat of liquid water
(3) density of ice is less than the density of liquid water
(4) density of ice is greater than the density of liquid water
When an atom loses an electron, we say that the atoms was ____________________.
Answers
Answer:
However, if something happens to make an atom lose or gain an electron then the atom will no longer be neutral.
Explanation:
A charged atom is called an ion. When an atom loses electron(s) it will lose some of its negative charge and so becomes positively charged. A positive ion is formed where an atom has more protons than electrons.