A student places three ice cubes in a beaker and allows them to partially melt. If she measures the temperature of the water in the beaker, what will she most likely observe? Explain your answer.
Answers
**Check for proof photos at the bottom.**
**Answers are in bold.**
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A student places three ice cubes in a beaker and allows them to partially melt. If she measures the temperature of the water in the beaker, what will she most likely observe? Explain your answer.
She will see that the temperature of the water is 0 degrees Celsius and it stays at that temperature until all the ice cubes completely melt.
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Use the table on the right to calculate each required quantity. Record values to 3 significant digits.
First answer: 35.8 kJ
Second answer: 871 g
Third answer: Fe
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An iron sphere with a mass of 75.00 g is heated to a temperature of 385.0°C. It is then placed in a beaker containing 150.0 g H2O at 100.0°C.
First answer: 339 kJ
Second answer: 9.02 kJ
Third answer: No
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A sample of water has a mass of 100.0 g. Calculate the amount of heat required to change the sample from ice at –45.00°C to water vapor at 175.0°C. Relevant constant values are given to the right.
First answer: 325 kJ
Second answer: boiling the water
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Identify the correct description for each part labeled on the diagram.
A: ✔ heating solid
B: ✔ melting
C: ✔ heating liquid
D: ✔ boiling
E: ✔ heating gas
F: ✔ melting point
G: ✔ boiling point
Where are the particles closest together?
✔ A
Explanation:When ice partially melts, the surrounding water remains at 0° Celsius. This is because ice melting only involves the water molecules overcoming intermolecular forces, or forces holding molecules together. The water molecules themselves aren't increasing in kinetic energy when turning into liquid. Since temperature measures kinetic energy, the temperature in this case, remains at 0°.
To find how much energy it takes to cause a phase change in a substance, you must find the number of moles, and determine whether to use ΔHvap and ΔHfus. ΔHvap is used to show how much energy is involved in evaporation and condensation, and ΔHfus is the same but used for melting and freezing. To find number of moles of a given substance, use the formula: mass of given substance divided by atomic mass. Both numbers have to use the same mass unit. Then, multiply number of moles by ΔHvap or ΔHfus to get kJ.
In a heating curve graph, the flat lines represent no change in energy, or the phase changes. The steep lines are change in energy, which are either heating or cooling. The bottom line is a heating/cooling solid. A heating/cooling solid is the coldest phase, which is why the line is at the bottom.
Here are photos of Edge to make things easier.
Related Questions
As Earth's population continues to grow, so will the competition for our water supply. Describe three actions that our government could take to reduce competition for water use.
Answers
Answer:
Recycling waste water, awareness about efficient use of water and rain water harvesting.
Explanation:
Our government could take to reduce competition for water use by recycling waste water, awareness about efficient use of water and rain water harvesting are the methods which can reduce competition for water supply. Awareness in people about water bring great change and the people used water efficiently. Water should be harvested through making of reservoirs which collects water from rain which can be used for drinking as well as washing purpose. Recycling of waste water also increases the amount of water and reduce competition.
Determine the molar masses for each of the following elements, compounds, or molecules. Remember to round to the proper amount of Sig Figs!
Cu(OH)2 _ g/mol
Na2WO4 _ g/mol
Pd _ g/mol
KMnO4 _ g/mol
NH3 _ g/mol
Answers
Answer:
Explanation:
Cu(OH)2 _97.65 g/mol
Na2WO4 _293.82 g/mol
Pd _106.42 g/mol
KMnO4 _158.03 g/mol
NH3 _17.03 g/mol
Answer:
Explanation:
round 2 4-figs:
Cu(OH)2 97.65 g/mol
Na2WO4 293.8 g/mol
Pd 106.4 g/mol
KMnO4 158.0 g/mol
NH3 17.03 g/mol
How do you think the human population has changed over time? What makes you say that?
Answers
Answer:The world population increased from 1 billion in 1800 to 7.7 billion today. The world population growth rate declined from 2.2% per year 50 years ago to 1.05% per year. Other relevant research: World population growth – This article is focusing on the history of population growth up to the present.
Explanation:
What is the approximate vapor pressure when the gas condenses at 70°C?
150
5
760
380
Answers
Answer:
380
Explanation:
I couldn't find the answer anywhere so this is the correct answer. I got it graded.
Para este mismo ejercicio, si se administran 2.5 litros de está solución (2,500ml) en un intervalo de 24 horas que cantidad en gramos de paciente en un día?
Answers
Answer:
Se administran 2500 gramos de solución por día.
Explanation:
Dado
Volumen de la solución = 2,5 litros
Como sabemos 1 litro = 1000 gramos
Por lo tanto, 2.5 litros = 2500 gramos
Se administran 2,5 litros en un intervalo de 24 horas o 1 día.
De ahí que se pueda decir que se administran 2500 gramos de solución al día.
The one factor that a scientist changes during an experiment.
Answers
Answer:
The independent variable
What type of change occurs during a chemical reaction?
Answers
Answer:
physical change.
Explanation:
because it changes its physical attributes
Calculate the current in amperes required to produce 18.0g of aluminium in 1.50hrs (al=27.og )
Answers
Answer:
35.7 A
Explanation:
Let's consider the reduction half-reaction of Al³⁺.
Al³⁺ + 3 e⁻ ⇒ Al
We will calculate the charge required to produce 18.0 g of Al using the following conversion factors.
1 mole of Al has a mass of 27.0 g1 mole of Al is formed upon the circulation of 3 moles of electrons1 mole of electrons has a charge of 96486 C (Faraday's constant)[tex]18.0gAl \times \frac{1molAl}{27.0gAl} \times \frac{3mole^{-} }{1molAl} \times \frac{96486C}{1mole^{-} } = 1.93 \times 10^{5} C[/tex]
1.93 × 10⁵ C circulate in 1.50 hours. The intensity is:
[tex]I = \frac{1.93 \times 10^{5} C}{1.50h} \times \frac{1h}{3600s} = 35.7 A[/tex]
Alkenes are more stable than alkanes. True or False
Answers
Answer:
Yes
Explanation:
Alkenes are relatively stable compounds, but are more reactive than alkanes because of the reactivity of the carbon–carbon π-bond. Most reactions of alkenes involve additions to this π bond, forming new single bonds.
¿en que estado de agregacion se encuentra un cuerpo con forma y volumen propio?
Answers
Answer: Um what is it?
Explanation:
A flexible camping tank has a sample of butane gas at 17.2 atm and has volume of 6.5L. What will be the volume if the pressure is adjusted to
6.4 atm?
Answers
Answer:
If the pressure is adjusted to 6.4 atm, the volume will be 17.47 atm.
Explanation:
Boyle's law says that the volume occupied by a given gaseous mass at constant temperature is inversely proportional to pressure. That is, if the pressure increases, the volume decreases while if the pressure decreases, the volume increases.
Mathematically, Boyle's law indicates that the product of pressure and volume always has the same value:
P*V= k
Analyzing an initial state 1 and a final state 2, it is satisfied:
P1*V1= P2*V2
In this case:
P1= 17.2 atmV1= 6.5 LP2= 6.4 atmV2= ?Replacing:
17.2 atm* 6.5 L= 6.4 atm* V2
Solving:
[tex]V2=\frac{17.2atm*6.5 L}{6.4 atm}[/tex]
V2=17.47 L
If the pressure is adjusted to 6.4 atm, the volume will be 17.47 atm.
What volume of 2M NaOH is required to completely neutralize 25mL of 1M HCl?
Answers
Answer:
[tex]\boxed {\boxed {\sf 12.5 \ mL \ NaOH}}[/tex]
Explanation:
In a neutralization reaction, an acid and base react to form salt and water. The hydrogen ions (H+) and hydroxide ions (OH-) combine to form water, while the other spectator ions bond to make salt.
For this reaction, the acid is HCl (hydrochloric acid) and NaOH (sodium hydroxide).
The H (from HCl) and OH (from NaOH) combine to make water (HOH or H₂O). The other ions, Cl and Na combine to form NaCl or sodium chloride. Let's write the neutralization reaction.
[tex]HCl _{(aq)}+NaOH _{(aq)} \rightarrow NaCl _{(aq)} + H_2O _{(l)}[/tex]
Now let's perform the calculation. We should use the titration equation or:
[tex]M_AV_A= M_BV_B[/tex]
where M is the molarity of the acid or base and V is the volume.
We know there are 25 milliliters of 1 molar HCl (acid) and an unknown volume of 2 molar NaOH (base).
[tex]\bullet M_A= 1 \ M \\\bullet V_A= 25 \ mL \\\bullet M_B= 2 \ M[/tex]
Substitute the known values into the formula.
[tex]1 \ M * 25 \ mL = 2 \ M * V_B[/tex]
Since we are solving for the volume of the base, we must isolate the variabel. it is being multiplied by 2 M and the inverse of multiplication is division. Divide both sides by 2 M.
[tex]\frac { 1 \ M * 25 \ mL}{2 \ M }=\frac{2 \ M * V_B}{2 \ M}[/tex]
[tex]\frac { 1 \ M * 25 \ mL}{2 \ M }= V_B[/tex]
The units of M cancel.
[tex]\frac { 1 * 25 \ mL}{2 }=V_B[/tex]
[tex]\frac {25}{2} \ mL= V_B[/tex]
[tex]12.5 \ mL= V_B[/tex]
12.5 milliliters of 2 M sodium hydroxide are required to neutralize 25 mL of 1 M hydrochloric acid.
How symbols are made?
Answers
Answer:
Humans convert virtually all direct and indirect impressions into symbols. The symbols that humans create are words. Every word consists of two components, a denotative and a connotative (for a complete discussion of denotation and connotation see Chapter 7, THE POWER OF WORDS).
Explanation:
Answer:
Humans convert virtually all direct and indirect impressions into symbols. The symbols that humans create are words. Every word consists of two components, a denotative and a connotative (for a complete discussion of denotation and connotation see Chapter 7, THE POWER OF WORDS).
Explanation:
8. In some reactions the process of oxidation and reduction takes place simultaneously. What are these
reactions termed as? Explain giving a suitable example.
2
Ans.
00
Answers
Answer:
zjtxxruxuxupm
Explanation:
fugilxltdptuszuourw passport RS a person Rd rseyozyoeToezyirzyorzrluziswzs the hell is going to thehdudb I have been a bit and then a email and your email find you by the way you can see the attached file is scanned image in PDF format and send it to the same
2.An atom with 35 mass number has 17
proton in its nucleus. Find the number of
neutron. What is its atomic number?
Answers
Answer:
mass no = A
Atomic number = Z= no of protons
Neutron = n
n = A-Z
n= 35- 17
= 18
Explanation:
During photosynthesis, plants incorporate atmospheric
Cinto more complex energy-storage
molecules that increase the mass of the plants. Plants need sunlight for this process because plants transform light
energy into
energy stored in the molecules.
Answers
Answer:
carbon dioxide
oxygen
**
During photosynthesis, plants incorporate atmospheric pressure into more complex energy-storage molecules that increase the mass of the plants. Plants need sunlight for this process because plants transform light energy into chemical energy stored in the molecules.
What is Photosynthesis ?
It is the process by which plants , algae and some bacteria uses water from the carbon dioxide, air and soil and in this process food is prepared in the presence of chlorophyll and sunlight. In this process light energy converted to chemical energy.
Thus, we can say that During photosynthesis, plants incorporate atmospheric pressure into more complex energy-storage molecules that increase the mass of the plants. Plants need sunlight for this process because plants transform light energy into chemical energy stored in the molecules.
Learn more about the Photosynthesis here: https://brainly.com/question/19160081
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HELP PLEASEWhat is the molarity of 4.0 moles of sodium chloride (NaCl) in 125 mL of solution?
Hint: 1 L of solution = 1000 mL of solution
Question 19 options:
500 M
32 M
0.50 M.
0.032 M
Answers
Pls answer this question 19 pls
Answers
Answer: The one direction where energy as heat will be initially transferred between the blocks is from block D to block A.
Explanation:
A substance like metal box that has high temperature will have more kinetic energy between its molecules due to which there will be more number of collisions between them.
Hence, it is able to transfer its heat energy more readily ac compared to a substance with low heat energy.
As a result, in the given diagram as temperature is increasing from block A to block B so heat energy will be transferred from block D to block A.
Thus, we can conclude that one direction where energy as heat will be initially transferred between the blocks is from block D to block A.
The saturation point for a solution is 50.0 grams of solute per 500. grams of solvent. If you pour 70.0 grams of
solute into 800. grams of solvent, how many more grams of solute can you dissolve before reaching saturation?
Answers
Answer:
10.0g of solute before reaching saturation
Explanation:
A saturated solution is the solution that contains the maximum amount of solute that can be dissolved. In the problem, you can have
50.0g of solute / 500.0g Solvent
Now, in 800.0g solvent you can dissolve:
800.0g Solvent * (50.0g solute / 500.0g Solvent) = 80.0g of solute can be added
As you dissolve initially 70.0g of solute. You can add:
80.0g - 70.0g =
10.0g of solute before reaching saturationConvert 3.01×10 23 molecules of H2O to moles.
Answers
3 L of a gas at 250 K is changed to a temperature of 300 K. What is the final volume?
Answers
Answer:
you can simply answer vl\t1=v2/t2
Which element has 16 neutrons, 15 protons, and 15 electrons?
Answers
Answer:
phosphorus
Explanation:
Answer:
phosphorus
Explanation:
phosphorus has to lose electrons
A block of aluminum weighing 200 g is cooled from 100C to 50°C with the release of 1080 joules of heat. From this data, calculate the specific heat of aluminum.
Answers
Answer:
0.108
Explanation:
You use the formula Q =mco
M is mass
Q is th heat release
C is specific heat
O is the temperature change
Substitute what you have and what you get in the information in the equation then you will get your answers
In your OWN words, what is the difference between a solute, solvent, and solution?
Answers
Answer:A solution is a homogeneous mixture consisting of a solute dissolved into a solvent . The solute is the substance that is being dissolved, while the solvent is the dissolving medium.
Explanation:A solution is a homogeneous mixture consisting of a solute dissolved into a solvent . The solute is the substance that is being dissolved, while the solvent is the dissolving medium.
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3.) What happened to Patroclus at the end of yesterday's reading?
He won the battle.
He went to Mt. Olympus to talk to Zeus.
He died.
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4.Who was Agamemnon trying to persuade to come fight with him again?
Patroclus
Achilles
Odysseus
Hector
The total mass of reactants and products is _______ during a chemical reaction
Answers
Answer: The total mass of reactants and products is the same during a chemical reaction.
Explanation:
the total mass of reactants is equal to the total mass of products.
How are people responsible for marine debris
Answers
Answer:
Marine debris comes from many different sources and enters the ocean in many ways. Intentional littering and dumping are a big cause of marine debris. ... Those rivers and streams can eventually carry the trash to the ocean. Improper or careless waste disposal is another big cause.
hope this helps
have a good day :)
Explanation:
Which statement about pollination is
TRUE?
Flowers are always pollinated
by insects.
Pollen is always transferred
from the same flower
When pollination occurs.
pollen sticks to the anther.
When pollination occurs
pollen sticks to the stigma.
Answers
Answer:
D; the pollen sticks to the stigma
Explanation:
When a flower is pollinated, the pollen sticks to the stigma. However, it is not always pollinated by insects (birds and other factors can as well), pollen can be transferred from different flowers (as long as they're the same species) and pollination doesn't stick to the anther.
Answer:
d
Explanation:
because when pollution occurs than the insects move to the flower to sick nectar and then pollan giains stuck in the insect body
Which of the following steps correctly converts 3 moles of fluorine to an equivalent number of particles of fluorine?
Group of answer choices
Divide Avogadro's number by 3.
Multiply 3 by Avogadro's number.
Multiply 3 by the atomic mass of fluorine.
Divide the atomic mass of fluorine by 3.
Answers
Answer:
B) Multiply 3 by Avogadro's number
Explanation:
This is according to Study.com
3 moles of fluorine contains 18.066✖10²³ Particles. thus, option B is correct
How many are there no. of particles in 1mole?One mole contains 6.022✖10²³ particles.
3 moles of flourine contains 3✖6.022✖10²³ particles
Hence, option “B” is correct
learn more about moles.
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Please help with this , it’s very important
Answers
Explanation:
a) Cr is acid K is base
b) Ca is base and the other left part is acid
c)Ca is base and F2 is acid
d) NH4 is acid and SO4 is base
Organize the following list of atoms from lowest to highest Electronegativity:
Beryllium, Barium, Strontium, Magnesium, Calcium
Answers
Answer:
Barium<Strontium<Calcium <Magnesium< Beryllium
Explanation:
Electronegativity is defined as the ability of an atom in a bond to attract the shared electrons of the bond towards itself.
Electronegativity is a periodic trend that decreases down the group and increases across the period.
Hence, if i want to arrange Beryllium, Barium, Strontium, Magnesium, Calcium in order of increasing electronegativity, i will have;
Barium<Strontium<Calcium <Magnesium< Beryllium