A scientist has two solutions, which she has labeled solution a and solution
b. each contains salt. she knows that solution a is 65% salt and solution b is 80% salt. she wants to obtain 120 ounces of a mixture that is 70% salt. how many ounces of each solution should she use?
To create a 120-ounce mixture that is 70% salt using Solution A (65% salt) and Solution B (80% salt), the scientist needs to mix 40 ounces of Solution A with 80 ounces of Solution B.
To solve this problem involving solution mixture, we can use the concept of the weighted average to find how many ounces of Solution A and Solution B are needed to create a new solution of desired concentration.
Let the amount of Solution A to be used be x ounces and the amount of Solution B be 120-x ounces.
Set up the equation considering that Solution A is 65% salt and Solution B is 80% salt, and we want a final mixture that is 70% salt of 120 ounces total.
The equation to be solved is 0.65x + 0.80(120-x) = 0.70(120).
Simplify and solve the equation for x.
Substitute x back into 120-x to find the amount of Solution B needed.
In this case, solving the equation gives us x = 40 ounces of Solution A and 120-x = 80 ounces of Solution B needed to achieve the 70% salt mixture.
Consider the chemical equilibrium of the following reaction CH3COOH CH3COO– (aq) + H+(aq) What will happen to the chemical equilibrium of the solution if CH3COONa is added? The equilibrium will shifts to the right. The equilibrium will shifts to the left. The equilibrium will be unaffected. The equilibrium will be lost.
Answer: The equilibrium will shifts to the left.
Explanation:
Any change in the equilibrium is studied on the basis of Le-Chatelier's principle.
This principle states that if there is any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.
[tex]CH_3COOH\rightleftharpoons CH_3COO^-+H^+[/tex]
Thus if [tex]CH_3COONa[/tex] is added it will dissociate to give [tex]CH_3COO^-[/tex] and [tex]Na^+[/tex]
[tex]CH_3COONa\rightarrow CH_3COO^-+Na^+[/tex]
Thus as the concentration of [tex]CH_3COO^-[/tex] increases, the equilibrium will shift in a direction where concentration of [tex]CH_3COO_-[/tex] decrease i.e. the dissociation of [tex]CH_3COOH[/tex] will be further depressed i.e the equilibrium will shift to the left.
Answer:
C
Explanation:
Sublimation and boiling both happen at the surface of the substance.
a. True
b. False
Write the element symbol for the element with the abbreviated electron configuration [ne]3s23p2.
Where are the alkali metals, the alkaline earth metals, the halogens, and the noble gases located on the periodic table?
The alkali metal, the alkaline earth metals, the halogens, and the noble gases are located in the periodic table in group 1, group 2, group 17, and group 18 respectively.
What is the periodic table?The periodic table is a tabular display of chemical elements. The periodic table is a graphic formulation of the periodic law, which states that the physical and chemical properties of the chemical elements are the periodic functions of their atomic numbers.
The table is arranged in horizontal rows called periods, and the vertical columns are called groups. Elements in the same column group of the periodic table show identical chemical characteristics.
The nonmetallic character increases from left to right in a period, and from down to up across a group, and the metallic character increases in the opposite direction.
The alkali metal and the alkaline earth metals are the elements of the s-block while the halogens and the noble gases are placed in the p-block.
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When metals form ions, they tend to do so by 1. losing electrons and forming positive ions 2. losing electrons and forming negative ions 3. gaining electrons and forming positive ions 4. gaining electrons and forming negative ions?
Answer:
1. losing electrons and forming positive ions
Explanation:
Metals form ions by losing electrons. They do it because they have few electrons in their outermost shells. So rather than accept more electrons, it is much more feasible to lose the few electrons and achieve the octet configuration.
With this alone, we know that options 3 and 4 are incorrect.
When metals lose electrons, the type of ion formed is a positive ion because the total number of protons (positive) would be more than the total number of electrons (negative) present.
For example in Ca²⁺;
Calcium loses 2 electrons. The charge however shows +2. This is because there are 20 protons and 18 electrons in the ion now, so 20 -18 = +2
The correct option is option 1. losing electrons and forming positive ions.
What is the Lewis dot structure Ch2Cl2
What element has its 7 valence electrons in energy level 4 in s and p orbitals?
Will all cars have roughly the same amount of force available
Classify these bonds as ionic, polar covalent, or nonpolar covalent na-f
The wall of the flask is periodically rinsed with the previously boiled deionized water from the wash bottle. does this titrimetric technique result in an increase, a decrease, or have no effect on the reported acetic acid in the vinegar
00 ml of 0.425 m h2so4 solution is required to completely neutralize 23.9 ml of koh solution. what is the molarity of the koh solution
00 mL? I believe that you have erroneously pasted the question here.
Anyway, let us continue computing for the molarity of KOH but i will just use a variable “A” for the volume of H2SO4 solution.
The complete balanced reaction is:
H2SO4 + 2KOH --> K2SO4 + 2H2O
We see that 2 moles of KOH is needed for every mole of H2SO4. So calculate the moles of H2SO4.
moles H2SO4 = 0.245 M * (A / 1000) = 2.45x10^-4 A
So the number of moles of KOH is:
moles KOH = 2.45x10^-4 A * 2
moles KOH = 4.90x10^-4 A
So the molarity of KOH is:
Molarity KOH = 4.90x10^-4 A / (0.0239 L)
Molarity KOH = 0.0205 * A
Simply multiply 0.0205 by the correct volume of H2SO4 in ml
The p block of the periodic table includes the elements in _______.
a. groups 3a through 8a
c. inner transition metals
b. transition metals
d. groups 1a and 2a
The major portion of an atom’s volume is(based on the gold foil experiment)?
Consider the chemical reaction in equilibrium.
H2 + I2 + heat ⬄ 2HI
What will happen to the chemical equilibrium if the temperature of the system is increased?
A)The direction of the chemical equilibrium will shift to the right, favoring the forward reaction.
B)The chemical equilibrium will not be affected by an increase in temperature.
C)The direction of the chemical equilibrium will shift to the left, favoring the reverse reaction.
D) The chemical equilibrium will be lost permanently with a change of temperature.
Answer: A) The direction of the chemical equilibrium will shift to the right, favoring the forward reaction.
Explanation: Any change in the equilibrium is studied on the basis of Le-Chatelier's principle.
This principle states that if there is any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.
For the given equation:
[tex]H_2+I_2+heat\rightleftharpoons 2HI[/tex]
This is a type of Endothermic reaction because heat is absorbed in the reaction.
On increasing the temperature, according to the Le-Chatelier's principle, the equilibrium will shift in the direction where decrease in temperature occurs. As this is an endothermic reaction, the temperature is decreasing in forward direction as heat is being absorbed.
Thus on increasing the temperature the reaction will shift in the right and rate of forward direction will increase.
Answer:
A) The direction of the chemical equilibrium will shift to the right, favoring the forward reaction.
Explanation:
how many moles are in 68.4 grams of neon?
In the science lab, students are testing solutions as acids or bases. the ph level of solution "x" was determined to be an 8. what is solution "x"?
A 0.784 g sample of magnesium is added to a 250 ml flask and dissolved in 150 ml of water. magnesium hydroxide obtained from the reaction required 215.0 ml of 0.300 m hydrochloric acid to completely react. how many moles of hcl were used?
A lot of values are given but we must focus only on HCl.
There are 215 mL (0.215 L) of 0.300 M HCl that was completely used. We must remember the moles is simply the product of volume and molarity, that is:
number of moles = 0.215 L * 0.300 M
number of moles= 0.0645 moles HCl
Which of the following examples demonstrates acceleration? Question 17 options: A boy running at a constant speed across the street. A car traveling at 60 mph turns left around a curve. A horse standing in a pasture. A track star is maintaining the same speed as he crosses the finish line.
A family of elements that has two electrons in its outer energy level is the
What is the maximum number of electrons that can occupy the 3rd electron shell
According to electronic configuration there are 18 electrons that can occupy the 3rd electron shell.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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The carbon atoms in large complex molecules are bonded to other atoms with
Who was the first to state the concept of an atom?
Answer:
The answer would be D. Democritus.
Explanation:
He was the first to state the concept of an atom.
Suppose the innermost orbit an electron can occupy has an energy level of -19 eV. Based on the absorption spectrum shown below, what is the energy of energy level 4?
The energy of the 4th energy level, taking into account the shift in energy levels in the given problem, is -6.25 eV.
Explanation:The energy levels of an electron in an atom are quantized, meaning they can only have certain specific values. The question states that the innermost orbit of an electron has an energy level of -19 eV.
In a regular hydrogen atom, the ground state or the lowest energy state is -13.6 eV. If we consider the absorption spectrum, it provides information about the energy required for the electron to move from one energy state to another.
Given that the innermost energy state (n = 1) is -19 eV and not the regular -13.6 eV, it implies that energy levels of the hydrogen atom have been shifted by a constant value. The difference, i.e., -19 eV - (-13.6 eV) = -5.4 eV needs to be considered.
So, for the 4th energy level, E4, it should be E4 = (-13.6 eV / 4²) - 5.4 eV = -0.85 - 5.4 = -6.25 eV. Note, the energy decreases as we move from the 1st to 4th energy level, hence the negative sign.
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How many lithium ions are present in 30.0 ml of 0.600 m li2co3 solution?
To calculate the number of lithium ions, we need to determine the number of moles of Li2CO3 and then multiply it by 2 (since there are 2 lithium ions for every 1 formula unit of Li2CO3). The number of lithium ions is 0.0360 mol.
Explanation:To determine the number of lithium ions present in the solution, we need to first calculate the number of moles of Li2CO3 using the given concentration and volume. From the formula Li2CO3, we can see that there are 2 lithium ions for every 1 formula unit of Li2CO3. Therefore, we can multiply the number of moles of Li2CO3 by 2 to calculate the number of lithium ions.
First, we need to calculate the number of moles of Li2CO3:
Moles of Li2CO3 = concentration (mol/L) × volume (L)
Moles of Li2CO3 = 0.600 mol/L × 0.0300 L = 0.0180 mol
Since there are 2 lithium ions for every 1 formula unit of Li2CO3:
Number of lithium ions = 2 × moles of Li2CO3 = 2 × 0.0180 mol = 0.0360 mol
Therefore, there are 0.0360 moles of lithium ions present in 30.0 mL of 0.600 M Li2CO3 solution.
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What physical properties would a pencil lead have
Why is identifying unknown compounds important to chemistry?
Final answer:
Identifying unknown compounds is crucial in chemistry as it helps determine their composition, structure, and properties. This knowledge is essential for predicting behavior, reactivity, and potential applications of compounds.
Explanation:
Identifying unknown compounds is important to chemistry because it allows scientists to determine the composition, structure, and properties of those compounds. By knowing the elements present in a compound, their relative amounts, and the molecular or empirical formula of the compound, chemists can make predictions about its behavior, reactivity, and potential applications. For example, knowing the composition of a compound can help scientists understand its toxicity, stability, solubility, and potential uses in various industries.
Most acids ionize in solution, and most bases _____ in solution.
ionize
disperse
dissociate
vaporize
If I have 6.02 x 10^23 atoms of silicon, how many grams of silicon do I have?
Final answer:
To determine the mass of silicon from the given number of atoms, we use Avogadro's number and the molar mass of silicon. One mole (6.02 × 1023 atoms) of silicon has a mass of about 28.0855 grams.
Explanation:
The question involves determining the mass of silicon given a number of atoms of silicon. We know that one mole of atoms is equivalent to Avogadro's number (6.022 × 1023 atoms). The mass of one mole of a substance is its molar mass, which for silicon is approximately 28.0855 grams. Therefore, if you have 6.02 × 1023 atoms of silicon, you have one mole of silicon, which weighs about 28.0855 grams.
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A student heats a 15.0 gram metallic sphere of unknown composition to a temperature of 98°C. The sphere is transferred to a calorimeter containing 100. mL of water at a temperature of 25.0°C. The student observes that the resulting temperture of both the water and the object is 27.1°C after the object is submerged.
1. Describe, in terms of the object and the water, the flow of heat energy that took place during the experiment.
2. Calculate the amount of heat energy gained by the water in the calorimeter.
Q = mc∆T???
3. Using the quantity of heat calculated in the previous question, determine the specific heat of the object.
1. Heat always flow from a region of higher temperature to a lower temperature, just like concentration gradient. So in this case, since the metallic sphere is hotter than water, so naturally heat energy flows from the metallic sphere to the water.
2. We use the formula:
Q = m C ∆T
where Q is the heat energy gained, m is mass of water, C is heat capacity of water = 4.184 J/g°C and ΔT is change in temperature
Since density of water is 1 g/mL, so mass is also 100g, therefore:
Q = 100 g * 4.184 J/g°C * (27.1°C - 25°C)
Q = 878.64 J
3. Heat gained by the water is equal to the heat lost by the metal, therefore:
Q(water) = - Q(metal)
878.64 J = - 15 g * C * (27.1°C - 98°C)
C = 0.83 J/g°C
Answer:
1. Heat always flow from a region of higher temperature to a lower temperature, just like concentration gradient. So in this case, since the metallic sphere is hotter than water, so naturally heat energy flows from the metallic sphere to the water.
2. We use the formula:
Q = m C ∆T
where Q is the heat energy gained, m is mass of water, C is heat capacity of water = 4.184 J/g°C and ΔT is change in temperature
Since density of water is 1 g/mL, so mass is also 100g, therefore:
Q = 100 g * 4.184 J/g°C * (27.1°C - 25°C)
Q = 878.64 J
3. Heat gained by the water is equal to the heat lost by the metal, therefore:
Q(water) = - Q(metal)
878.64 J = - 15 g * C * (27.1°C - 98°C)
C = 0.83 J/g°C
Explanation: