The total heat needed to heat ice from -12°C to 0°C, melt the ice at 0°C, and heat the liquid water from 0°C to 27°C is 2778 J.
To calculate the total heat needed for the three processes, we need to calculate the heat needed for each process separately and then add them together.
Heating the ice from -12°C to 0°C
The heat needed for this process can be calculated using the following equation:
Q = m * C * ΔT
where:
Q is the heat in Joules (J)
m is the mass of the ice in grams (g)
C is the specific heat capacity of ice in Joules per gram degree Celsius (J/g°C)
ΔT is the change in temperature in degrees Celsius (°C)
The mass of the ice is 5.88 g, the specific heat capacity of ice is 2.09 J/g°C, and the change in temperature is 12°C (from -12°C to 0°C). Substituting these values into the equation above, we get:
Q = 5.88 g * 2.09 J/g°C * 12°C = 147.47 J
Melting the ice at 0°C
The heat needed to melt the ice can be calculated using the following equation:
Q = m * Δh_fus
where:
Q is the heat in Joules (J)
m is the mass of the ice in grams (g)
Δh_fus is the latent heat of fusion of ice in Joules per gram (J/g)
The latent heat of fusion of ice is 6.02 kJ/mol. We need to convert the mass of the ice to moles first.
0.327 moles = 5.88 g / 18.0 g/mol
Substituting the mass of the ice in moles and the latent heat of fusion into the equation above, we get:
Q = 0.327 moles * 6.02 kJ/mol = 1.96653 kJ = 1966.53 J
Heating the liquid water from 0°C to 27°C
The heat needed for this process can be calculated using the following equation:
Q = m * C * ΔT
where:
Q is the heat in Joules (J)
m is the mass of the liquid water in grams (g)
C is the specific heat capacity of liquid water in Joules per gram degree Celsius (J/g°C)
ΔT is the change in temperature in degrees Celsius (°C)
The mass of the liquid water is 5.88 g, the specific heat capacity of liquid water is 4.184 J/g°C, and the change in temperature is 27°C (from 0°C to 27°C). Substituting these values into the equation above, we get:
Q = 5.88 g * 4.184 J/g°C * 27°C = 663.82 J
Total heat
The total heat needed for all three processes is:
Q_total = Q_1 + Q_2 + Q_3 = 147.47 J + 1966.53 J + 663.82 J = 2777.82 J
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A solution of sucrose in water has a boiling point that is _____ 100°C.
Answer:
greater than
Explanation:
just took it and yes i know someone already answered but i figred this would be quicker!!!!!!
What is the coefficient of mno2 when you balance the equation for this redox reaction? kcn(aq) + kmno4(aq) + h2o(l) → kcno(aq) + mno2(s) + koh(aq)?
A certain compound is made up of one phosphorus (P) atom, three chlorine (Cl) atoms, and one oxygen (O) atom. What is the chemical formula of this compound?
The chemical formula of that compound is POCl₃ and Its chemical name is phosphoryl chloride.
What is phosphoryl chloride?It is a chemical compound and its formula is POCl₃. It is manufactured industrially on a large scale from phosphorus trichloride and oxygen. It is a colorless liquid and has a pungent smell, Its molar mass is 153.33 grams per mole, its melting and boiling points are 274.4 K and 378.9 K respectively, it is soluble in water, and its molecular shape is tetrahedral. It is a reducing agent.
It is used in the making of semiconductors, plasticizers, hydraulic fluids, organophosphorus, and pesticides, and it is widely used as a chlorinating agent and dehydrating agent in laboratories.
Hence, the chemical formula of phosphoryl chloride is POCl₃.
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1 mol of CCl4 molecules has ____ moles of Cl atoms.
A sample of propane, c3h8, contains 15.7 moles of carbon atoms. how many total moles of atoms does the sample contain?
Final answer:
To find the total moles of atoms in the propane sample, consider its molecular formula, with 3 carbon atoms and 8 hydrogen atoms.
Explanation:
The total moles of atoms in the propane sample can be calculated by considering the molecular formula of propane, C₃H₈.
Propane consists of 3 carbon atoms and 8 hydrogen atoms.
Therefore, in the given sample, there are a total of 3 x 15.7 moles of carbon atoms and 8 x 15.7 moles of hydrogen atoms.
Explain how scientific observations led to the development of, and changes to, the periodic table.
He approximate molar concentration of several chemicals are given. find the ph of each. use the calculator and round to the nearest tenth, if necessary. oven cleaner: [h+] = 10−13 ph = water: [h+] = 0.0000007 ph = blood: [h+] = 0.00000004 ph = vinegar: [h+] = 0.0063 ph =
Answer:
oven cleaner: ph=13
water: ph=6.2
blood: ph=7.4
vinegar ph=2.2
Explanation:
got it right on ed
The pH values for the given solutions are calculated using the formula pH = -log[H+], where [H+] is the concentration of hydrogen ions. The pH values for an oven cleaner, water, blood, and vinegar are found to be 13.0, 7.2, 7.4, and 2.2 respectively.
Explanation:To calculate the pH of a solution, we use the formula pH = -log[H+]. Here [H+] represents the molar concentration of hydrogen ions in moles per liter (M).
Oven cleaner: With [H+] = 10-13 M, we find pH as follows:
pH = -log(10-13) = 13.0
Water: For [H+] = 0.0000007 M or 7×10-7M:
pH = -log(7×10-7) = 7.2
Blood: Given [H+] = 0.00000004 M or 4×10-8M:
pH = -log(4×10-8) = 7.4
Vinegar: With [H+] = 0.0063 M:
pH = -log(0.0063) = 2.2
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Why does a compound have characteristic properties?
Answer: Because of the arrangement of atoms in a compound.
Explanation:
A compound is defined as the chemical specie which is formed by the combination of two or more different type of atoms. For Example: [tex]H_2O,O_2[/tex] etc...
A compound has different physical and chemical properties than corresponding elements because of change in identity. For Example: Hydrogen and oxygen are gases, but the compound formed by the combination of these two that is water is liquid.
In a chemical compound, elements are combined in a fixed ratio of their masses.
Hence, a compound has characteristic property because of the arrangement of atoms in a compound
why N2 has a lower boiling point than CO?
N2 has a lower boiling point than CO because N2, being a nonpolar molecule, can't exhibit dipole-dipole attractions that CO, being a polar molecule, can. This results in weaker intermolecular forces in N2 than CO, hence a lower boiling point.
Explanation:The reason why N2 has a lower boiling point than CO is due to the different intermolecular forces they experience. Both CO and N2 are diatomic molecules with similar atomic masses, therefore, they experience similar London dispersion forces. However, the key difference is that CO is a polar molecule and thus, it experiences dipole-dipole attractions. On the other hand, N2 is a nonpolar molecule and therefore, can't exhibit dipole-dipole attractions. Hence, the dipole-dipole attractions in CO are stronger than the dispersion forces in N2, leading to a higher boiling point for CO.
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According to the collision theory what two factors must be true to successfully result in a reaction
Explanation:
According to collision theory, more is the number of collisions between the particles of reactants more will be the rate of a reaction.
Two important factors of collision theory are as follows.
Sufficient energyOrientationSufficient energy: Molecules participating in a chemical reaction should have sufficient amount of energy so that they can overcome activation energy barrier and participate effectively in the reaction.
Orientation: Collision between the molecules should take place with proper orientation so that they successfully result in the formation of products.
According to the collision theory, the two factors that must be true for a reaction to occur are sufficient energy and proper orientation of reactant particles.
What is the collision theory of reactions?The collision theory states that a reactant molecules must collide effectively with energy greater than or equals to activation energy for products to be formed.
According to the collision theory, the two factors that must be true are:
reactant molecules must be oriented properly the reactant molecules must have sufficient energyTherefore, sufficient energy and proper orientation of particles is necessary for product formation.
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How many hydrogen atoms are in each molecule of trisilylamine?
Answer:
9Explanation:
The amine functional group is obtained by subsititution of one or more hydrogen atoms in the ammonia compound.
Ammonia is NH₃.
Then,
by substituting one hydrogen you obtain R - NH₂. by substituting two hydrogens you obtain R' - NH - R''by subsituting the three hydrogens you obtain:R'''
|
R' - N - R''
In this case, the three subsitutuents are silyl groups. The silyl group is derived form silane and is SiH₃. So, the tcompound trisilylamine is:
SiH₃
|
SiH₃ - N - SiH₃
Thus, you can count 3 hydrogen atoms for every silylgroup for a total of 9 hydrogen atoms in each molecule of trisilylamine.
Methanol is an important solvent. it is also an important starting material for the synthesis of other molecules. most methanol today is obtained from the
If 832J of energy is required to raise the temperature of a sample of aluminum from 20.0°C to 97.0°C, what mass is the sample of aluminum? (The specific heat of aluminum is 0.90 J/(g × °C).) 0.10 g 10.0 g 12.0 g 57.7 g
Hello!
If 832J of energy is required to raise the temperature of a sample of aluminum from 20.0°C to 97.0°C, what mass is the sample of aluminum? (The specific heat of aluminum is 0.90 J/(g × °C).
a) 0.10 g
b) 10.0 g
c) 12.0 g
d) 57.7 g
Data:
Q (Amount of heat) = 832 J
m (mass) = ?
c (Specific heat) = 0.90 J/(g × ° C)
T (final) = 97 ºC
To (initial) = 20 ºC
ΔT = T - To → ΔT = 97 - 20 → ΔT = 77 ºC
Formula:
Q = m*c*ΔT
Solving:
[tex]Q = m*c*\Delta{T}[/tex]
[tex]832 = m*0.90*77[/tex]
[tex]832 = 69.3\:m[/tex]
[tex]69.3\:m = 832[/tex]
[tex]m = \dfrac{832}{69.3}[/tex]
[tex]\boxed{\boxed{m \approx 12.00\:g}}\end{array}}\qquad\quad\checkmark[/tex]
Answer:
12.0 g
____________________________________
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substance which allows energy to pass through it
In which situation can a mixture always be called a solution?
What is the complete ionic equation for the reaction of hydrochloric acid with potassium hydroxide? h+ + cl- + k+ + oh- → 2h+ + o2- + k+ + cl- h+ + cl- + k+ + oh- → h2o + k+ + cl- h+ + oh- → h2o none of the above 2h+ +2cl- + k2+ + 2oh- → h2o + k2+ +2 cl-?
What substance is added to an organic molecule to test for the degree of saturation? bromine hydrogen gas water hydrogen bromide?
Final answer:
Bromine is added to an organic molecule to test for saturation; it reacts with unsaturated compounds causing a color change, while the color remains the same in the presence of saturated compounds.
Explanation:
The substance added to an organic molecule to test for the degree of saturation is bromine. This test is based on bromine's distinctive brownish-orange color, which fades upon reaction with unsaturated compounds. In the reaction, bromine is added to the double or triple bonds present in unsaturated hydrocarbons, causing a decolorization as it forms a dibromo compound. On the other hand, if the organic molecule is saturated, the bromine retains its color as there are no double or triple bonds for the bromine to react with.
On a molecular level, the reaction demonstrates the difference between saturated and unsaturated hydrocarbons. Saturated hydrocarbons, such as alkanes, have a C-H bond that can potentially react with bromine, whereas unsaturated hydrocarbons like alkenes and alkynes have double or triple bonds that readily react with bromine, respectively. This chemical behavior is part of the microscopic domain that helps distinguish structural differences in organic compounds.
If you have a solid like ice (solid water), which of the following substances below would most closely resemble the structure of ice? indium cadmium quartz topaz
Aqueous acetic acid is neutralized by aqueous barium hydroxide. express your answer as a balanced molecular equation. identify all of the phases in your answer.
The balanced molecular equation for the given reaction is:
[tex]2CH_3COOH(aq) \ + \ Ba(OH)_2(aq) \rightarrow \ Ba(CH_3COO)_2(aq) + 2H_2O(l).[/tex]
FURTHER EXPLANATIONTo check that the equation is balanced count how many atoms are present for each element in the reactant and product side. If they are the same before and after reaction for all elements, then the reaction is deemed balanced.
The atom counting for the equation is shown below:
[tex]2CH_3COOH(aq) \ + \ Ba(OH)_2(aq) \rightarrow \ Ba(CH_3COO)_2(aq) + 2H_2O(l).[/tex]
Reactants → Products
C: (2 x 2) =4 C: (2 x 2) = 4
H: (2 x 4) + (1 x 2) =10 H: (3 x 2) + (2 X 2) = 10
O: (2 x 2) + (1 x 2) = 6 O: (2 x 2) + (2 x 1) = 6
Ba: 1 Ba: 1
Since the number of atoms of each element are similar in the reactants and products, the equation is balanced.
To determine the state of the substances, consider their solubility.
The reactants are both aqueous (aq) as indicated in the problem.
The first product, [tex]Ba(CH_3COO)_2[/tex] is aqueous (aq) because based on the solubility rule, it will dissolve in water. Acetates are generally soluble.
The other product is water which will be liquid (l) since it is the solvent used to dissolve the substances.
LEARN MORESolubility Rules https://brainly.com/question/12984314Net Ionic Equation https://brainly.com/question/12980075Keywords: acid-base, neutralization, balancing equations, molecular equation
The balanced molecular equation for reaction of acetic acid and barium hydroxide is as follows:
[tex]\boxed{2\text{CH}_3\text{COOH}(aq)+\text{Ba(OH)}_2(aq)\rightarrow\left(\text{CH}_3\text{COO}\right)_2\text{Ba} (aq)+2\text{H}_2\text{O}(l)}[/tex]
Further Explanation:
Neutralization reaction:
This reaction occurs when acid and base react with each other and salt and water are formed. Since these reactions neutralize excess amount of hydrogen or hydroxide ions in the solution, it is named so.
Acetic acid is weak acid and barium hydroxide is strong base. Both react with each other to form salt and water and neutralization reaction takes place.
Chemical equations are written in following different types of equations:
Molecular equations Total ionic equations Net ionic equationsIn molecular equations, reactants and products are present in undissociated form. Total ionic equations involve all different types of ions involved in the reactions. But in net ionic equations, only useful ions are written.
In this reaction, [tex]\text{CH}_3\text{COOH}[/tex], reacts with [tex]\text{Ba(OH)}_2[/tex] to form [tex]\left(\text{CH}_3\text{COO}\right)_2\text{Ba}[/tex] and [tex]\text{H}_2\text{O}[/tex]. Here, [tex]\text{CH}_3\text{COOH}[/tex], [tex]\text{Ba(OH)}_2[/tex] and [tex]\left(\text{CH}_3\text{COO}\right)_2\text{Ba}[/tex] are present in aqueous phase while [tex]\text{H}_2\text{O}[/tex] is present in liquid phase. Unbalanced molecular equation becomes,
[tex]\text{CH}_3\text{COOH}(aq)+\text{Ba(OH)}_2(aq)\rightarrow\left(\text{CH}_3\text{COO}\right)_2\text{Ba} (aq)+\text{H}_2\text{O}(l)[/tex]
Number of atoms of all elements on both sides of reaction is written.
On reactant side,
Number of C atom is 1.
Number of H atoms is 6.
Number of Ba atoms is 1.
Number of O atoms is 4.
On the product side,
Number of C atom is 2.
Number of H atoms is 8.
Number of Ba atoms is 1.
Number of O atoms is 5.
Initially, atoms other than carbon, oxygen, and hydrogen are balanced by multiplying with some number on any side. Ba atoms are balanced on both sides. So carbon, hydrogen and oxygen atoms are balanced now. For this, [tex]\text{CH}_3\text{COOH}[/tex] is multiplied by 2 and [tex]\text{H}_2\text{O}[/tex] by 2. Now the balanced equation is as follows:
[tex]2\text{CH}_3\text{COOH}(aq)+\text{Ba(OH)}_2(aq)\rightarrow\left(\text{CH}_3\text{COO}\right)_2\text{Ba} (aq)+2\text{H}_2\text{O}(l)[/tex]
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Answer details:
Grade: High School
Subject: Chemistry
Chapter: Chemical reactions and equations
Keywords: chemical reactions, reactants, products, molecular equations, net ionic equation, CH3COOH, H2O, Ba(OH)2, (CH3COO)2Ba, Ba, O, H, C.
How many electrons are transferred in the ionic bond between sodium and chlorine in nacl?
Answer:
1
Explanation:
Just got it right on the quiz.
That is the exchange to fill.
Hope this helps.
What happens to the atomic mass of the elements moving from left to right within a period?
As you move across a period, the atomic mass increases because the atomic number also increases. ... The atomic mass for any given atom mainly comes from the mass of the protons and neutrons.
Moving from left to right across a period on the periodic table, the atomic mass of the elements generally increases. This is due to an increase in the number of protons and neutrons in the nucleus. For instance, in the second period, the atomic mass of Lithium is less than that of Neon.
Explanation:As you move from left to right across a period on the periodic table, there is an increase in the atomic mass of the elements. This happens because the number of protons, which contribute to the atomic mass, in the nucleus of an atom increases. The atomic mass is approximated by the mass number, which is the sum of the number of protons and neutrons in an atom's nucleus. Therefore, as the number of protons (and usually neutrons) increases, the atomic mass of the elements also generally increases.
For example, in the second period, the atomic mass of Lithium (Li) is about 7 amu, while the atomic mass of Neon (Ne), at the end of the same period, is about 20 amu.
Thus, when moving from left to right within a period of the periodic table, the atomic mass generally increases due to an increase in the number of protons and neutrons in the nucleus.
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Can just one measurement be considered precise? Can just one measurement be considered accurate?
Final answer:
A single measurement cannot be considered precise as precision requires consistency across multiple measurements. However, a single measurement can be considered accurate if it closely matches the true or accepted value. Accuracy and precision are critical in scientific measurements for validity.
Explanation:
The concepts of accuracy and precision are fundamental in scientific measurements. When it comes to a single measurement being considered precise or accurate, context is essential. Precision refers to the consistency of repeated measurements. Therefore, one isolated measurement cannot be labeled as 'precise' without additional data to compare it to. However, a single measurement can be considered accurate if it is very close to the true or accepted value. For instance, if you measure a piece of standard computer paper and it states that it is 11.0 inches long, if you measure it once and obtain 11.1 inches, that single measurement can be considered quite accurate, assuming the stated length is correct.
Nevertheless, precision is really about the reproducibility of multiple measurements, and accuracy concerns how close a measurement is to the true or accepted reference value. For instance, if you have a series of measurements showing 11.1 in., 11.2 in., and 10.9 in., these could be considered both accurate and precise, as they are close to the true value of 11.0 inches and to each other. Conversely, a single measurement of 12 inches would be neither accurate (not close to 11.0 inches) nor precise if the rest of the measurements are significantly different from 12 inches.
Calculate the molar enthalpy change of H2O (l) when liquid water is heated from 41.7 C to 76.2 C
Final answer:
The molar enthalpy change of H2O (l) when liquid water is heated from 41.7 C to 76.2 C can be calculated using the formula: Q = mcΔT
Explanation:
The molar enthalpy change of H2O (l) when liquid water is heated from 41.7 C to 76.2 C can be calculated using the formula:
Q = mcΔT
Where,
Q is the heat energy changem is the mass of waterc is the specific heat capacity of water (4.184 J/g°C)ΔT is the change in temperature (76.2 C - 41.7 C)From the given equation, we can calculate the molar enthalpy change when 1 mole of water is heated using the molar mass of water (18.015 g/mol).
Using the formula:
ΔH = Q / n
Where,
ΔH is the molar enthalpy changeQ is the heat energy change (calculated earlier)n is the number of moles of waterWe can substitute the values into the formula and calculate the molar enthalpy change.
Calculate the molar solubility of Ni(OH)2 in water. Use 2.0 * 10^-15 as the solubility product constant of Ni(OH)2.
Answer:
The molar solubility of [tex]Ni(OH)_2[/tex] in water [tex]7.93\times10^{-6} mol/L[/tex].
Explanation:
[tex]Ni(OH)_2\rightleftharpoons Ni^{2+}+2OH^-[/tex]
S 2S
Solubility of Nickel hydroxide =[tex]K_{sp}=2.0\times 10^{-15}[/tex]
[tex]K_{sp}=S\times 2S^{2}=4S^3[/tex]
[tex]2.0\times 10^{-15}=4S^3[/tex]
[tex] S=7.93\times10^{-6} mol/L[/tex]
The molar solubility of [tex]Ni(OH)_2[/tex] in water [tex]7.93\times10^{-6} mol/L[/tex].
the atomic number of boron is 5. what does this tell you about an atom of boron?
Boron is 5 in the periodic table of elements and the mass is rounded up 10 11. If the atomic number of boron is 5, that means that there would be 5 protons and 5 electrons.
the basic organizational feature of the periodic table of elements
What is the molar ratio for the following equation after it has been properly balanced?
____C3H8 + ____O2 Imported Asset ____CO2 + ____ H2O
Reactants: C3H8 = 2, O2 = 5; Products: CO2 = 6 and H2O = 4
Reactants: C3H8 = 1, O2 = 5; Products: CO2 = 3 and H2O = 4
Reactants: C3H8 = 1, O2 = 8; Products: CO2 = 3 and H2O = 4
Reactants: C3H8 = 1, O2 = 5; Products: CO2 = 3 and H2O = 5
The correct option is b. The balanced chemical equation for the combustion of propane is C₃H₈ + 5O₂ → 3CO₂ + 4H₂O. The molar ratio of the reactants and products is 1:5:3:4. Therefore, the correct option given is Reactants: C₃H₈ = 1, O₂ = 5; Products: CO₂ = 3, H₂O = 4.
The molar ratio for the combustion of propane (C₃H₈ ), we must first balance the chemical equation. The unbalanced equation is: C₃H₈ + O₂ → CO₂ + H₂O
Balancing carbon (C) atoms: C₃H₈ + O₂ → 3CO₂ + H₂O
Balancing hydrogen (H) atoms: C₃H₈ + O₂ → 3CO₂ + 4H₂O
Balancing oxygen (O) atoms: C₃H₈ + 5O₂ → 3CO2 + 4H₂O
Therefore, the balanced equation is: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
From this balanced equation, we see the molar ratio is: C₃H₈ : O₂ : CO₂ : H2O = 1 : 5 : 3 : 4
Thus, the correct choice is B : Reactants: C₃H₈ = 1, O₂= 5; Products: CO₂ = 3, H2O = 4
What statement correctly describes the key features of the graph of f(x) = 4(1/2)^(x + 1 )− 3
Y-intercept of (0, −1), starts up on the left, gets closer to y = −3 on the right
Y-intercept of (0, −1), starts down on the left, gets closer to y = −3 on the right
Y-intercept of (0, 1), starts up on the left, gets closer to y = −3 on the right
Y-intercept of (0, 1), starts down on the left, gets closer to y = −3 on the right
Answer:
The correct option is:
"Y-intercept of (0, −1), starts down on the left, gets closer to y = −3 on the right"
Explanation:
You have the following function:
[tex]f(x)=y=4*(\frac{1}{2}) ^{x+1} -3[/tex]
The intersection on the "y" axis implies that the value at "x" must be zero. So, to calculate the value in "y" you must replace "x" with the value 0 and perform the corresponding calculations:
[tex]y=4*(\frac{1}{2}) ^{0+1} -3[/tex]
[tex]y=4*(\frac{1}{2}) -3[/tex]
[tex]y=2 -3[/tex]
[tex]y=-1[/tex]
Being (x, y) a point on the graph, the y- intercept is (0,-1).
This function is an exponential function function, whose form corresponds to the general expression:
[tex]g(x)=k*a^{x-h} +b[/tex]
Where:
If a is greater than 1 (a> 1), the function is increasing. On the other hand, if a is less than 1 (a <1), the function is decreasing. b is the independent term of the equation and determines the Horizontal Asymptote, which is a horizontal line to which the function is approaching indefinitely. In this case it is the value -3.The graph of the function is shown in the attached image.
The correct option is:
"Y-intercept of (0, −1), starts down on the left, gets closer to y = −3 on the right"
what are 2 key characteristics of a good scientific investigation
Calcium fluoride (CaF2) has a solubility constant of 3.45 x 10-11
. What is the molar solubility of CaF2 in water?
4.15 x 10-6 M
5.87 x 10-6 M
2.05 x 10-4 M
3.26 x 10-4 M