if an ice cube at 0c with a certain mass melted to water at 0 c what formula is needed to find the heat
Answers
To find the heat needed to melt an ice cube at 0°C to water at 0°C, use the formula:
Q = m * Lf
Where Q is the heat, m is the mass of the ice cube, and Lf is the latent heat of fusion for ice (which is 334 kJ/kg).
When an ice cube at 0°C is melted to water at 0°C, energy is required to break the hydrogen bonds holding the ice molecules together. This energy is known as the latent heat of fusion, and is represented by the symbol Lf. The value of Lf for ice is 334 kJ/kg.
To find the heat needed to melt an ice cube at 0°C to water at 0°C, we use the formula Q = m * Lf, where Q represents the heat required, m represents the mass of the ice cube, and Lf represents the latent heat of fusion of ice.
For example, if we have an ice cube with a mass of 50 grams, we can find the heat required to melt it by multiplying its mass by the latent heat of fusion for ice.
Q = m * Lf = 0.05 kg * 334 kJ/kg = 16.7 kJ
Therefore, it would take 16.7 kilojoules of heat to melt a 50 gram ice cube at 0°C to water at 0°C. This formula is useful in many applications, such as in refrigeration and in the study of thermodynamics.
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Related Questions
air is made up of different gasses such as oxygen nitrogen and carbon dioxide. which statement best describes these three components of air?
-they are all classified as pure substances
-they cannot react with another substance
-they are chemically bonded to one another
-they can be classified as elements
Answers
Answer:
They are chemically bonded to one another
Answer:
they can be classified as elements
does anyone know how to do this??????
Answers
Answer:
you have to answer about what Emmy Noether was known for and how she accomplished her goal! For example Dr. Martin Luther King was known for his peaceful protests and his famous "I Have a Dream". He accomplished this goal by never giving up and sticking to his morals! I hope this helped!! ♡♡ (BTW love your profile picture)
Can anyone let me know if my answers to #26 and #27 are correct or not?
Answers
Answer:
I believe it is
Explanation:
I take chemistry right now so I believe it is right
how many moles are in 425g of KNO3?
Answers
Answer:
The answer is 101.1032
Explanation:
Calculate the average atomic mass of chromium, given the following percent abundances and isotope masses: 4.350 % 49.946 amu; 83.790% 51.941 amu; 9.500% 52.941 amu and 2.360% 53.939 amu
Answers
Asnwer: average atomic mass of chromium is 52amu
Calculations:
49.946amu: 4.350%= 0.0435
51.941amu: 83.790%= 0.8379
52.941amu: 9.500%= 0.095
53.939amu: 2.360%= 0.0236
Average atomic mass of chromium = 0.0435(49.946) + 0.8379(51.941) + 0.095(52.941) + 0.0236(53.939)
= 51.9963703amu
= 52 amu
two clauses are shown. select if either, neither, or both are false. (i) glycerol is the backbone of triacylglycerides (ii) it is [redacted] during fatty acid mobilization
Answers
In this question we are given with two statements and are asked to determine the true ones.
Statement 1: Glycerol is the backbone of triacylglycerides, is true as Glycerol, which is a three-carbon molecule.
It forms the backbone of triglycerides and phospholipids.
Generally, Triglycerides includes three fatty acids, each attached to each of the carbons in glycerol.
Whereas, the structure of Phospholipids includes two fatty acids attached to the two carbons of glycerol and the third carbon is to bind a phosphate group.
Statement 2: it is [redacted] during fatty acid mobilization is also true as the glycerol on after mobilization of fatty acids moves into liver cells, where it gets metabolized into glycolytic/gluconeogenetic intermediates.
Whereas, fatty acids are insoluble in water and are dependent on a protein carrier serum called albumin that helps in transport them to their target cell.
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write the correct formulas that indicate only a physical change has taken place
1. 2NaCl + MgO -->
2. 2H2 + O2 -->
Answers
2NaCl + MgO → Na₂O + MgCl₂ and 2H₂ + O2 →2H₂O the correct formulas that indicate only a physical change has taken place
In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition
2NaCl + MgO → Na₂O + MgCl₂ has change the color as well as appearance and in the 2H₂ + O2 →2H₂O has also change in the physical changes
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4-ethyl-2-methyl-3-propyl heptanoic acid
drawing
Answers
The structure of the 4-ethyl-2-methyl-3-propyl heptanoic acid is shown in the image attached
How do you know the structure of a compound?
The arrangement and connectivity of the atoms within a molecule are referred to as the structure of an organic substance. Along with other elements including oxygen, nitrogen, sulfur, and halogens, organic molecules are largely made of carbon atoms bound to hydrogen atoms.
It is crucial to remember that organic compounds can exist in several isomeric forms, where the same chemical formula leads to various structural configurations. The connection of atoms or the spatial arrangement of atoms in three-dimensional space might vary between isomers.
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2 moles of NO, was placed in an empty I dm' bottle and allowed to reach equilibrium according to the equation:
At equilibrium, 1.2 moles of N,O, dissociated. Calculate the value of the equilibrium constant for the reaction at that
temperature.
Answers
2NO(g) ⇌ N2(g) + O2(g)
According to the problem statement, 2 moles of NO were placed in a 1 dm^3 bottle and allowed to reach equilibrium, and at equilibrium, 1.2 moles of NO had dissociated. This means that the initial concentration of NO was:
[NO]initial = 2 mol / 1 dm^3 = 2 M
And the concentration of NO at equilibrium is:
[NO]equilibrium = (2 - 1.2) mol / 1 dm^3 = 0.8 M
Since the stoichiometry of the balanced equation is 2:1:1 for NO, N2, and O2, respectively, the equilibrium concentrations of N2 and O2 will also be 0.6 M.
The equilibrium constant (Kc) can be calculated using the equilibrium concentrations of the reactants and products, raised to the power of their stoichiometric coefficients. Therefore:
Kc = ([N2][O2]) / ([NO]^2)
Substituting the equilibrium concentrations into the equation, we get:
Kc = (0.6 M x 0.6 M) / (0.8 M x 0.8 M)
Kc = 0.5625
Therefore, the value of the equilibrium constant for the reaction at that temperature is 0.5625. Note that the units of Kc depend on the stoichiometry of the balanced equation. Since the stoichiometric coefficients are all 1, the units of Kc in this case are M^-1
What is a periodic trend?
O A. An older version of the periodic table
O B. A pattern that appears on the periodic table
C. Any characteristic of the noble gases
O D. A numbering system for the periodic table
Answers
Answer:
b
Explanation:
Copper is a transition metal that can have more than one charge. Write the equation of Cu+ reacting with hydrochloric acid. Then write the reaction of Cu+2 reacting with hydrochloric acid. How does the amount of hydrogen gas evolved change with each?
Answers
The amount of hydrogen gas that evolved in the reaction of Cu⁺ with HCl is less than the amount of hydrogen gas that evolved in the reaction of Cu₂⁺ with HCl.
When the Copper (I) ion (Cu⁺) reacts with hydrochloric acid (HCl), it undergoes a single replacement reaction, as follows:
Cu⁺ (aq) + HCl (aq) → CuCl (aq) + H⁺ (aq)
In this reaction, copper (I) ion is oxidized to copper (II) ion (Cu₂⁺) while hydrogen ion (H⁺) is reduced to hydrogen gas (H₂).
The reaction of Copper (II) ion (Cu₂⁺) with hydrochloric acid (HCl) also undergoes a single replacement reaction, as follows:
Cu₂⁺ (aq) + 2HCl (aq) → CuCl₂ (aq) + 2H⁺ (aq)
In this reaction, copper (II) ion is reduced to copper (I) ion (Cu⁺) while hydrogen ion (H⁺) is again reduced to hydrogen gas (H₂).
The second reaction produces twice the amount of hydrogen gas compared to the first reaction.
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a cation of 2 indicates that an element has question 25 options: a) gained two protons. b) lost two neutrons. c) gained two electrons. d) lost two protons. e) lost two electrons.
Answers
When an element has a cation of +2, it has lost two electrons. A solution is a choice (E).
In electrolysis, the cathode would be drawn to a positively charged ion called a cation. In order for a cation to develop, one or more electrons must be lost, usually by the action of atoms with a larger affinity for them.
Following the chemical symbol is a number indicating the number of electrons lost and consequently the charge of the ion. For example, silver (Ag) loses one electron to become Ag+ while zinc (Zn) loses two electrons to become Zn2+.
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If 62.6 grams of lead (II) chloride is produced, how many grams of lead (II) nitrate were reacted ?
Answers
74.5 grams of lead (II) nitrate were reacted to produce 62.6 grams of lead (II) chloride.
To determine the mass of lead (II) nitrate that was reacted when 62.6 grams of lead (II) chloride is produced, we need to use the stoichiometry of the balanced chemical equation and calculate the molar masses of the compounds involved.
The balanced chemical equation for the reaction is:
2Pb(NO3)2 + 2NaCl → 2PbCl2 + 2NaNO3
From the equation, we can see that 2 moles of Pb(NO3)2 react to produce 2 moles of PbCl2. Therefore, the molar ratio of Pb(NO3)2 to PbCl2 is 1:1.
First, let's calculate the molar mass of PbCl2 and Pb(NO3)2:
Molar mass of PbCl2 = Atomic mass of Pb + 2 × Atomic mass of Cl
= 207.2 g/mol + 2 × 35.45 g/mol
= 278.1 g/mol
Molar mass of Pb(NO3)2 = Atomic mass of Pb + 2 × (Atomic mass of N + 3 × Atomic mass of O)
= 207.2 g/mol + 2 × (14.01 g/mol + 3 × 16.00 g/mol)
= 331.2 g/mol
Next, we can calculate the moles of PbCl2 produced:
Moles of PbCl2 = Mass of PbCl2 / Molar mass of PbCl2
= 62.6 g / 278.1 g/mol
≈ 0.225 mol
Since the molar ratio of Pb(NO3)2 to PbCl2 is 1:1, the moles of Pb(NO3)2 reacted will also be 0.225 mol.
Finally, to find the mass of Pb(NO3)2 that was reacted, we can use the moles and molar mass:
Mass of Pb(NO3)2 = Moles of Pb(NO3)2 × Molar mass of Pb(NO3)2
= 0.225 mol × 331.2 g/mol
≈ 74.5 g
Therefore, approximately 74.5 grams of lead (II) nitrate were reacted to produce 62.6 grams of lead (II) chloride.
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Explain how natural resources are identified and why natural recourses are in evenly distributed.
Answers
Answer:
Natural resources are not evenly distributed all over the world. Some places are more endowed that others — for instance, some regions have lots of water (and access to ocean and seas). Others have lots of minerals and forestlands. Others have metallic rocks, wildlife, fossil fuels and so on.
Explanation:
Which statement about scientific consensus is true?
Answers
what are the options?
reply in comments so i can help:)
The true statement about scientific consensus is that; : It represents the beliefs of most scientists.
What is scientific consensus?The term scientific consensus refers to what is generally accepted as fact by scientists.
Hence, the true statement about scientific consensus is that; : It represents the beliefs of most scientists.
Missing parts;
Which statement about scientific consensus is true? A. It represents the beliefs of most scientists. B. It is the only way to prove a theory true. C. It is necessary to form a hypothesis. D. It is an assurance that the interpretations of a study are correct. E. It is necessary before research can be published in a science journal.
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Follow these steps, and record your findings in the table:
1. Put 10 milliliters of distilled water into a test tube. Label it
test tube 1, and place it in the test tube rack.
2. Record the temperature of the water.
3. Measure 1.00 gram of anhydrous copper(ll) sulfate (white
powder) into a weighing boat.
4. Pour the anhydrous copper(ll) sulfate into test tube 1.
5. Measure the final temperature of the solution in test tube 1.
Watch the thermometer for a couple of minutes, and record
the highest temperature it reaches.
6. Calculate and record the difference of the initial and final
temperatures of water in the test tube.
В І
Ų x? X2
12pt
A
E E ES
Initial temperature
(°C)
Final temperature
(°C)
Answers
The formula below is used to determine the temperature change of the exothermic reaction:
Temperature change = final temperature - beginning temperature.
What is meant by exothermic reaction?When anhydrous copper(II) sulfate is dissolved in water, heat is released into the environment and a solution with a temperature greater than the water used to dissolve it is created.We described the heat flow q as negative when heat is emitted from the system to its surroundings in Section II-B of Chapter 3. Therefore, the H of reaction for exothermic processes is negative. Endothermic chemical reactions are those in which the reactants take in heat energy from the environment to create products. A cooling effect results from these events because they cause their immediate surroundings to become cooler.Chemical processes known as exothermic and endothermic reactions, respectively, absorb and release heat. Photosynthesis is an excellent illustration of an endothermic reaction. An exothermic reaction is one that burns.Exothermic reactions are this kind of reaction.
The formula below is used to determine the temperature increase:
Temperature change equals final temperature minus beginning temperature.
The temperature of their surroundings rises as a result of exothermic reactions.
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In an atom, if you change the number of neutrons you get a(n)
-ion
-isotope
-different element
Answers
Answer: Isotope
Explanation: It's an isotope because isotopes are atoms with the same number of protons but different neutrons. Ions are atoms have different number of electrons and it wouldn't be a different element because the atom still has the same number of protons.
The basic structural material of the body consists of ________. proteins lipids carbohydrates nucleic acids.
Answers
Proteins make up the bulk of the body's structural components.
How do proteins work?The body uses the large, complex molecules known as proteins for a number of essential processes.. They are crucial for the structure, operation, and control of the body's tissues and the majority of their work is done inside cells by organs.
Which protein food is the best?Meat, fish, poultry, eggs, legumes, and soy products like tofu or tempeh are a few examples of foods high in protein. You can also select meals from this list of delicious high-protein dishes to make sure you meet your needs at every meal.
What indications or symptoms suggest an excess of protein?Having too much protein might cause indigestion and intestinal pain.
Unbearable fatigue, dehydration, nausea, irritability, headaches, and diarrhoea.
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You have sweetened iced tea with sugar, and ice cubes are present, How many phases are present?
Answers
The number of phases present is two.
Phases present in a systemThere are two phases present in sweetened iced tea with sugar and ice cubes. The first phase is the liquid phase of the tea, which contains water, sugar, and other dissolved substances.
The second phase is the solid phase of ice cubes, which contains solid water molecules. These two phases are in contact with each other, and the sugar molecules in the liquid phase are dissolved in the water molecules.
The ice cubes, being a solid, do not dissolve in the liquid phase but coexist with it in the same container.
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The most important ELEMENT found in all living things is
A. Oxygen
B. hydrogen
C. Nitrogen
D. Carbon
Answers
Answer:
A. Carbon hope this helps
Answer:
D. Carbon. I guess that's the answer
what happened that alowed cells to be studied
Answers
40 points plz help quick!! Order the interactions from strongest to weakest.
1. Covalent Bond
2. Ionic Bond
3. Dipole-Dipole Interactions
4. Hydrogen Bond
5. Dispersion forces
Answers
Answer:
2,5,4,1,3
Explanation:
Answer:
Ionic Bond
Explanation:
What is described by the frequency of a wave?
A. The speed the wave is traveling through space
B. The number of waves that pass a point in 1 second
C. The height of the wave from trough to peak
D. The distance from one peak to the next peak
Answers
Taking into account the definition of frecuency, the statement "The number of waves that pass a point in 1 second" describes the frequency of a wave.
Definition of frequencyFrequency is the number of vibrations that occur in a unit of time. Its unit is s⁻¹ or hertz (Hz).
In other words, the frequency in wave phenomena, such as sound, electromagnetic waves (such as radio or light), electrical signals or other waves, expresses the number of times the phenomenon is repeated per unit of time. For example, if a wave repeats ten times per second, it means that it has a frequency of ten cycles per second.
SummaryFinally, the statement "The number of waves that pass a point in 1 second" describes the frequency of a wave.
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Half the distance between the nuclei of two covalently bonded atoms is the ______, whereas half the shortest distance between the nuclei of identical nonbonded atoms is the ______.
Answers
Covalent radius refers to covalently bonded atoms while atomic radius refers to non-bonded atoms.
There are two terms that are easily confused for each other in chemistry, these are the covalent radius and atomic radius. Covalent radius refers to covalently bonded atoms while atomic radius refers to non-bonded atoms.
Hence, half the distance between the nuclei of two covalently bonded atoms is the covalent radius, whereas half the shortest distance between the nuclei of identical nonbonded atoms is the atomic radius.
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When silver carbonate dissolves in water, what ions are produced?
Answers
When silver carbonate (Ag₂C₃) dissolves in water, it dissociates into silver ions (Ag+) and carbonate ions (CO₃ 2-).
When silver carbonate (Ag₂C₃) dissolves in water, it dissociates into its constituent ions. The formula unit of silver carbonate consists of two silver ions (Ag+) and one carbonate ion (CO₃ 2-). When silver carbonate is added to water, the ionic bonds between the silver and carbonate ions are broken, resulting in the release of Ag+ and CO₃ 2- ions into the solution. The Ag+ ions carry a positive charge, while the CO₃ 2- ions carry a negative charge, and these ions become solvated in the water.
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There are two isotopes of chlorine. The lighter one with a mass number of 35 (Cl- 35) and the heavier Cl - 37. The atomic mass of chlorine is 35.45 u. Given the mass of chlorine isotopes and the atomic mass of chlorine, determine which isotope is more. Justify your answer.
i need help asap, pls respond quick
Answers
Answer:
Cl-35 isotope is more abundant.
Explanation:
How to calculate the abundance of isotopes in a mixture from the mass of isotopes and the average atomic mass of the element?
The atomic mass of an element having two or more naturally occurring isotopes is calculated using the following relation : Average atomic mass = % abundance of isotope A x atomic mass of isotope A + % abundance of isotope B x atomic mass of isotope B.Solution :
Say the % abundance of Cl - 35 is x, i.e, 100 units of Cl contains x units of Cl-35.
Therefore, the % abundance of Cl - 37 is (100 - x).
∴ [35 x + 37 (100-x)] = 35.45 x 100
Simplifying the above equation, we get
-2x + 3700 = 3545
Subtracting 3700 from both sides of the equation, we get
-2x = -155
or, 2x = 155
Dividing both sides of the equation by 2, we get
x = 155 ÷ 2 = 77.5
∴ 100 -x = 22.5
Thus, Cl-35 is more abundant (77.5%) than Cl-37 (22.5%).
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In a science demonstration, a teacher mixed zinc (Zn) with hydrogen chloride (HCl) in a flask and quickly attached a balloon over the mouth of the flask. Bubbles formed in the solution and the balloon inflated.
What most likely occurred during this demonstration?
The Zn and HCl both retained their identity.
Either Zn or HCl, but not both, retained its identity.
Evaporation of one of the substances occurred.
One or more new substances formed.
Answers
Answer:
The answer is D
Explanation:
One or more new substances formed.
Answer:
D.One or more new substances formed.
Explanation:
What was the biggest obstacle for the theory of continental drift to overcome?
1. no answer for how the continents moved
2. Wegener wrote all his work in a language no one could read
3. land bridges had better evidence
4. there was no concrete evidence for continental drift
PICK ONE
Answers
Answer: The answer Is A: No answer for how the continents moved.
What is a safety guide line?
Answers
Answer:
A safety guide lines are rules and regulations that are made to make sure place is safe and conducive for everyone.
plsss help I really appreciate it! If I have 17 moles of gas at a temperature of 67°C, and a pressure of 5.34 atmospheres, what is the volume of the gas? Substitute your numbers into the generic equation. This is where you show your math work, step by step. Solve the problem.
Answers
Use the state equation for ideal gases: pV = nRT
Data:
V = 88.89 liter
n = 17 mol
T = 67 + 273.15 = 340.15 K
R = 0.0821 atm * liter / (K*mol)
=> p = nRT / V = 17 mol * 0.0821 (atm*liter / K*mol) * 340.15 K / 88.89 liter
p = 5.34 atm
Answer: p = 5.34 atm
