The arrows in the chart below represent phase transitions.
Which arrows represent the phase transitions in which heat energy is gained?
1, 2, and 3
2, 3, and 5
3.4. and 5
4.5 and 6
Answers
Answer:
a. 1,2,and 3.
Explanation:
When something turns liquid, e.g. metal, you need to heat it. When something turns gas, e.g. water, you need to heat it. And when something goes directly from solid to gas, e.g. dry ice, carbon dioxide, you need to add heat to it. hope this helps! Please mark brainiest.
Related Questions
Iron oxide reacts with carbon monoxide to produce iron and carbon dioxide, with the balanced chemical equation Fe2O3 +3C0 —> 2Fe +3CO2. What does this tell you
about the relative amounts of iron oxide and iron consumed and produced in this equation?
A. For every two moles of iron oxide consumed, one mole of iron is produced.
B. For every two grams of iron oxide consumed, one gram of iron is produced,
C. For every gram of iron oxide consumed, two grams of iron are produced.
D. For every mole of iron oxide consumed, two moles of iron are produced.
Answers
Answer:
D. For every mole of iron oxide consumed, 2 moles od iron are produced.
Explanation:
(1)Fe2O3 + 3CO → 2Fe + 3CO21 mol of iron oxide, is made up of 2 iron molecules and 3 oxygen molecules. In a balanced equation, both sides of the equation all of the molecules in the 1st half have to be included in the 2nd half of the equation as well.
Answer:
D. For every mole of iron oxide consumed, 2 moles od iron are produced.
Explanation:
What trend does electronegativity follow,going down the periodic table?
Answers
Answer:
The answer is option C.
Hope this helps you
Indicate the bonding type in each of the following compound CsBr
Answers
Answer:
Ionic bonding
Explanation:
A bond between a metal and a non-metal is an ionic bond and Since, Cesium is a metal and Bromine is a non-metal, It form the bond called Ionic Bond.
What does the latent heat of fusion measure?
Answers
Answer:
The energy required to change the phase of a substance is known as a latent heat.
Explanation:
The energy require is Q= m L, where m is the mass of the substance and L is the specific latent heat of fusion or vaporisation which measures the heat energy to change 1 kg of a solid into a liquid. hope this helps you :)
Answer & Explanation:
The energy required to change the phase of a substance is known as a latent heat. ... The energy require is Q= m L, where m is the mass of the substance and L is the specific latent heat of fusion or vaporization which measures the heat energy to change 1 kg of a solid into a liquid.
Water has a density of 1.0 g/ml and a test liquid has density of 1.1 g/ml. If you pour equal portions of the two liquids into a cup,what will happen ( assuming the two do not mix or create a chemical reaction)?
Answers
Answer:
Since the test liquid is denser than water, theoretically the test liquid would sink, but since the difference is so minor, the liquid poured after may float on top of the other liquid.
Explanation:
Answer:the test liquid will be on top.
Explanation:the test liquid has a higher density(1.1g/mol) than that of the water with density (1.0g/mol)
how many bonds are present in NCl3
Answers
The products of a reaction are NaCl and H2O. What does the law of conservation of matter reveal about the reactants in the reaction? A. At least some of the reactants will include NaCl and H2O. B. The reactants will contain only Na, Cl, O, and H in some amounts. C. Na, Cl, O, H, and three other elements were the reactant elements. D. The reactants will have one Na, one Cl, one O, and two H atoms.
Answers
Answer:
D
Explanation:
total mass should be equal on both sides
it's a double do displacement reaction
HCl + NaOH --> NaCl + H2O
what’s that mass of 7.14 X 102 mol of PC13
Answers
Answer:
16.25 x 10^-20g
Explanation:
molar mass of PCl3
31(1)+3(35.5) = 137.5
n= mass/molar mass
7.14 x 10² = mass / 137.5
mass = 7.14 x 10² x 137.5
mass = 98175g
hi:) how to do question 3?:)
Answers
Answer:
5
Explanation:
Distilled water has a pH of 7 while CO2 is slightly acidic and therefore if we combine both substances we should get a pH just below 7 which if 5
Answer:
A) 5
Explanation:
5
The pH of distilled water immediately after distillation is 7, but within hours after distillation, it has absorbed carbon dioxide from the atmosphere and become acidic with a pH of 5
Calculate the mass (in grams) of hydrogen gas produced when 33.61 g of
diborane (B2H) reacts with excess water.
B Holg) + 6H2O(1)→ 2 H3B03(s) + 6H2(g)
Only enter numerical value without units.
Answers
Answer:
14.40g of H2
Explanation:
The balanced equation for the reaction is given below:
B2H6(g) + 6H2O(l) → 2H3BO3(s) + 6H2(g)
Next, we shall determine the mass of B2H6 that reacted and the mass of H2 produced from the balanced equation. This is illustrated below:
Molar mass of B2H6 = (2x11) + (6x1) = 28g/mol
Mass of B2H6 from the balanced equation = 1 x 28 = 28g
Molar mass of H2 = 2x1 = 2g/mol
Mass of H2 from the balanced equation = 6 x 2 = 12g
From the balanced equation above,
28g of B2H6 reacted to produce 12g of H2.
Finally, we shall determine the mass of H2 produced when 33.61g of B2H6 reacted with excess water. This can be obtained as follow:
From the balanced equation above,
28g of B2H6 reacted to produce 12g of H2.
Therefore, 33.61g of B2H6 will react to produce = (33.61 x 12)/28 = 14.40g of H2.
Therefore, 14.40g of H2 were produced from the reaction.
Which of the following chemical reactions is reversible?
A. The burning of wood.
OB. The dehydration of copper sulfate (CuSO4).
O C. The neutralization of an acid.
OD. The freezing of water into ice
Reset Selection
Answers
How can we tell the difference between gases like hydrogen, oxygen, and carbon dioxide cause they all look to same?
Answers
Answer:
The critical chemical difference is that CO2 contains one atom of carbon and two atoms of oxygen, whilst CO has one carbon and one oxygen atom.
For each item, choose whether the change is a physical change or a chemical change.
exploding firecracker:
mowing grass:
breaking a window:
spreading butter on toast:
burning wood in a fireplace:
acid rain corroding gravestones:
Answers
Answer:
Explanation:
Exploding Firecracker - Chemical Change
Mowing Grass - Physical Change
Breaking a Window - Physical Change
Spreading butter on toast - Physical Change
burning wood in a fireplace - Chemical Change
acid rain corroding gravestones: Chemical Change
In a physical change, the chemical composition is not altered, easily reversible and no new substance is formed.
In a chemical change, the chemical composition of the substance is altered. Not reversible and a new substance is always formed at the end of the reaction.
The average score for games played in the NFL is 21.1 and the standard deviation is 8.9 points. 46 games are randomly selected. Round all answers to 4 decimal places where possible and assume a normal distribution.
A. P(21.4317 < ¯x < 22.7561) =
B. Q1 for the ¯x distribution =
The line next to the x should be over the x.
Answers
Answer:
A) P(21.4317 < ¯x < 22.7561) = 0.2975
B) Q1 for the ¯x distribution = 21.9844
Explanation:
The Central Limit theorem allows us to say that
Sample mean = Population mean = 21.1 points
Mean of sampling distribution = σₓ = (σ/√n)
σ = population standard deviation = 8.9 points
n = sample size = 46
σₓ = (8.9/√46) = 1.3122334098 = 1.3122
A) P(21.4317 < ¯x < 22.7561) =
This is a normal distribution problem
To find this probability, we will use the normal probability tables
We first normalize/standardize 21.4317 and 22.7561.
The standardized score of any value is that value minus the mean divided by the standard deviation.
For 21.4317
z = (x - μ)/σ = (21.4317 - 21.1)/1.3122 = 0.25
For 22.7561
z = (x - μ)/σ = (22.7561 - 21.1)/1.3122 = 1.26
The required probability
P(21.4317 < ¯x < 22.7561) = P(0.25 < z < 1.26)
Checking the tables
P(21.4317 < ¯x < 22.7561) = P(0.25 < z < 1.26)
= P(z < 1.26) - P(z < 0.25)
= 0.89617 - 0.59871
= 0.29746 = 0.2975 to 4 d.p.
B) Q1 for the distribution is the first quartile. The first quartile is greater than 25% of the distribution.
P(x > Q1) = 0.25
Let the z-score that corresponds to Q1 be z'
P(x > Q1) = P(z > z') = 0.25
But P(z > z') = 1 - P(z ≤ z') = 0.25
P(z ≤ z') = 1 - 0.25 = 0.75
From the normal distribution tables,
z' = 0.674
z' = (Q1 - μ)/σ
0.674 = (Q1 - 21.1)/1.3122
Q1 = 0.674×1.3122 + 21.1 = 21.9844228 = 21.9844 to 4 d.p.
Hope this Helps!!!
Which best explains why a firework being ignited is an example of an exothermic reaction and not an endothermic reaction?
A)The fireworks produce colors.
B)The fireworks give off heat.
C)Igniting the fireworks requires energy
D)Igniting the fireworks makes an odor.
Answers
Answer:B
Explanation:
TOOK DA TEST
As the firework releases heat, it is considered as exothermic reaction. The correct option is B.
What is exothermic reaction?An exothermic reaction is one in which the energy required to break bonds in the reactants is less than the energy released when new bonds form in the products.
Energy is constantly released during an exothermic reaction, often in the form of heat. Exothermic reactions characterize all combustion reactions.
Endothermic reactions are chemical reactions that produce products by absorbing heat energy from their surroundings.
Exothermic reactions are important in forensic science, particularly in the investigation of fires and explosions.
Endothermic refers to a chemical reaction that requires heat and results in cooling of the surroundings.
As fireworks are releasing energy in the form of heat, it can be called as an exothermic reaction.
Thus, the correct option is B.
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The enthalpy of formation of water is –285.8 kJ/mol. What can be inferred from this statement? The enthalpy of the products is equal to the enthalpy of the reactants. Heat is absorbed during the process. Heat is released during the process. The enthalpy of the products is more than the enthalpy of the reactants.
Answers
Answer:
Heat is released during the process.
Explanation:
From the information provided in question, the enthalpy of formation of water is –285.8 kJ/mol. This is simply an exothermic reaction.
The negative sign indicates that the enthalphy of the reactants is more than the enthalphy of the products and as such, heat is released from the system into the surroundings.
The enthalpy of formation of water is –285.8 kJ/mol means that heat is released during the process.
What is enthalpy of formation of a substance?The enthalpy of formation of a substance is the amount of heat given off or absorbed when one mole of a substance is formed from the reactants.
A positive value for enthalpy means the reaction is endothermic while a negative value for enthalpy means the reaction is endothermic.
Therefore, the enthalpy of formation of water is –285.8 kJ/mol means that the reaction is exothermic and heat is released during the process.
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what’s the mass of 0.0485 moles of Na2CO3
Answers
Answer:5.1g
Explanation:number of moles of Na2co3 is 0.0485 and it molar mass = 23×2+12+16×3=106
n=m/M
Therefore m= n×M
m= 0.0485×106
=5.141g
The mass of 0.0485 moles of Na2CO3 of 5.141 grams.
What is mass?Mass is defined as a dimensionless number used to describe the mass of a particle or item. Inertia, or the body's resistance to acceleration when a net force is applied, is also measured by this term. The strength of an object's gravitational pull to other bodies is also influenced by its mass. The kilogram serves as the SI's fundamental mass unit. Mass is a physical body's total amount of matter. Gravity and inertia, which are the two main forces influencing how objects move in space, make mass crucial.
Mass can be calculated as
Mass = molar mass x number of moles
Molar mass = 23 x 2 + 12 + 16 x 3
= 106 grams
Mass = 106 x 0.0485
= 5.141 grams
Thus, the mass of 0.0485 moles of Na2CO3 of 5.141 grams.
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How many hours does it take to form 15.0 L of Oz measured at 750
torr and 30°C from water by passing 1.15 A of current through an
electrolytic cell?
Answers
Answer:
55.7 hrs
Explanation:
We'll begin by calculating the number of mole of O2 produced during the process. This can be obtained as follow:
Volume (V) = 15L
Pressure (P) = 750torr = 750/760 = 0.99atm
Temperature (T) = 30°C = 30°C + 273 = 303K
Gas constant (R) = 0.0821 atm.L/Kmol
Number of mole (n) =?
PV = nRT
0.99 x 15 = n x 0.0821 x 303
Divide both side by 0.0821 x 303
n = (0.99 x 15 ) /(0.0821 x 303)
n = 0.597 mole
Next, we shall determine the quantity of electricity required to liberate 1 mole of O2. This is illustrated below:
2O^2- + 4e —> O2
Thus, 4 moles of electron (e) is needed to produce 1 mole of O2.
Recall:
1 electron (e) = 1 Faraday = 96500C
1e = 96500C
Therefore, 4e = 4 x 96500C = 386000C.
Therefore, 386000C of electricity is required to liberate 1 mole of O2.
Next, we shall determine the quantity of electricity required to liberate 0.597 mole of O2.
This is illustrated below:
From the balanced equation above,
386000C of electricity is required to liberate 1 mole of O2.
Therefore, XC of electricity will be required to liberate 0.597 mole of O2 i.e
XC of electricity = 386000 x 0.597
XC of electricity = 230442C
Therefore, 230442C of electricity is needed to liberate 0.597 mole of O2.
Now, we can obtain the time taken to produce 0.597 mole of O2 as follow:
Current (I) = 1.15A
Quantity of electricity (Q) = 230442C
Time (t) =.?
Q = It
230442 = 1.15 x t
Divide both side by 1.15
t = 230442/1.15
t = 200384.35 secs
Finally, we shall convert 200384.35 secs to hours. This is illustrated below:
3600 secs = 1 hr
Therefore, 200384.35 secs = 200384.35/3600 = 55.7 hrs
Therefore, it will take 55.7 hrs to produce 15L of O2.
1.1 The elements with the lowest ionization energy of all element are
O The noble gases
O The alkali metals
O The alkaline earth metals
O The halogens
Answers
Answer:
O The alkali metalsThe elements with the lowest ionization energy of all element are alakli metals
Explanation:
According to research,
The element with the lowest ionization energy is cesium (Cs). Cesium has atomic number 55 and is in the fifth row of the periodic table.
Caesium is a soft, silvery-golden alkali metal .
Compound is the fundamental type of matter that has unique set of properties and cannot be broken down into simpler form.
Answers
Answer: Compound
Explanation: pure substance that cannot be broken down into simpler substances by chemical or physical means. Each element has unique physical and chemical properties.
To draw a Lewis structure for a polyatomic ion, begin by calculating A, the available electrons, and N, the needed electrons. What is N for CIO3-, the chlorate ion?
Answers
Answer:
N for chlorate ion is one
Explanation:
Because N is the number of electrons needed to form octet structure causing a negative charge of one, since it already has 25valence electrons
Answer: 26
Correct Answer
give three example of mixture that can be separated by filtration process
Answers
Answer:
Mixture of sand and water.Mixture of chalk particles in water.Mixture of pebbles and water.Explanation:
Hope it helps.
hi :) how to test if a solution is neutral?
Answers
Explanation:
solution is neutral because it added water and water is neutral solution
Which answer below correctly identifies the type of change and the explanation for the boiling of water?
o physical change because even though the change caused the temperature of the water to
increase, the water's physical properties remained exactly the same
o physical change because even though gas formation was observed, the water was undergoing a
state change, which means that its original properties are preserved
chemical change because gas formation was observed, which indicated that the water was
transformed into a different substance
O chemical change because a temperature change was observed, which indicated that the water
was transformed into a different substance
Answers
Answer:
O chemical change because a temperature change was observed, which indicated that the water
Explanation:
I have taken this class
A bomb calorimeter has a heat capacity of 3.82 kJ/°C. A sample of cinnamaldehyde is ignited in the calorimeter, resulting in a temperature increase from 24.53°C to 31.23°C. How much heat was created by the combustion of cinnamaldehyde?
Answers
Answer:
THE HEAT CREATED BY THE COMBUSTION OF THE CINNAMALDEHYDE IS 25.594 JOULES.
Explanation:
When heat capacity of a substance is given, the heat evolved or used up in the process is the multiplication of the heat capacity and the temperature difference.
Heat = Heat capacity * change in temperature
Heat capacity = 3.82 kJ/°C
Change in temperature = 31.23 C - 24.53 C = 6.7 °C
So therefore, the heat created by the combustion of the cinnamaldehyde is:
Heat = 3.82 * 6.7
Heat = 25.594 Joules
In conclusion, 25.594 J of heat is created from the combustion of cinnamaldehyde
Bird wings and dragonfly wings are both used for flight.
Answers
Answer:
Yes
Explanation:
What's the question?
Answer:
yes, they both use it to fllight.
Explanation:
As they are adapted to flight to various places to catch their prey and be safe from various type of harms.
hope it helps..
Drag each label to the correct location. Match the climate zones to their relative temperature levels. (coldest zonehottest zonemoderate temperature zone)
Answers
Answer:
Polar Zones - Coldest Temperature
Temperate Zones - Moderate Temperature
Tropical Zones - Hottest Temperature
Explanation:
The closer you are to the Equator, the hotter it gets, as the sun hits the middle of the Earth the most. At the poles, the sun hits it there the least, so it is the coldest. In between, we would have a mild between hot and cold.
*Remember that the Earth is at a tilt, and that is why we have seasons and why the Equator is so hot and the Poles are so cold.
Answer:
I answered the question on edmentum and that person was correct.
Explanation:
The polar zone is the coldest because the Sun’s rays hit this part of Earth at a wide angle, causing their energy to be spread thinly over a large surface area.
The topical zone is the hottest because the Sun’s rays hit this part of Earth nearly straight on, focusing the heat on a small surface area.
The temperate zone experiences moderate temperatures because the Sun’s rays hit this zone at an angle that concentrates the heat on a surface area that is smaller than on the polar zone and larger than on the tropical zone.
Determine the new pressure of a sample of hydrogen gas if the volume and moles are constant, the initial pressure is 6.0 atm, and it is heated from 15°C to 30.°C. PLEASE HELP ASAP! THANK U SO MUCH!
6.3 atm
5.7 atm
12 atm
3.0 atm
Answers
Answer:
6.3 atm.
Explanation:
Data obtained from the question include:
Initial pressure (P1) = 6 atm
Initial temperature (T1) = 15°C = 15°C + 273 = 288K
Final temperature (T2) = 30°C = 30°C + 273 = 303K
Final pressure (P2) =..?
Since the volume and number of mole of the hydrogen gas sample is constant, the following equation will used to obtain the new pressure:
P1/T1 = P2/T2
6/288 = P2 /303
Cross multiply
288 x P2 = 6 x 303
Divide both side by 288
P2 = (6 x 303) /288
P2 = 6.3 atm
Therefore, the new pressure of the hydrogen gas sample is 6.3 atm.
You are performing an
experiment in your lab. To
compare with other experiments
your results must be in moles.
During your final step you burn a
strip of magnesium (Mg), which
results in 187 grams of
magnesium oxide (MgO). How
should you enter your results?
PSP
O
A. 7.7 moles Mgo
B. 4.6 moles Mgo
C. 187 grams Mgo
D. 7536.1 moles Mgo
Resot Selection
Answers
Answer:
4.6 moles MgO
Explanation:
number of moles is equals to the mass in grams divided by RFM
RFM=16+24.3=40.3
187/40.3
=4.6 moles of MgO
During your final step you burn a strip of magnesium (Mg), which results in 187 grams of magnesium oxide (MgO) the results would be 4.6 moles Mgo. option B is correct.
What are moles?The value of one mole is given by Avogadro's number which is 2.303 × 10²³ moles but here the used weight is given so number of moles will be calculated with other formula.
A strip of magnesium (Mg), which results in 187 grams of magnesium oxide (MgO) number of moles will be,
n = W / M
where , n = number of moles
W = given weight
M = molar mass
substituting the values in equation,
n = 187 / 40.30
n = 4.6 moles
Therefore, final step you burn a strip of magnesium (Mg), which results in 187 grams of magnesium oxide (MgO) the results would be 4.6 moles Mgo. option B is correct.
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How many molecules are in each sample?
A. 4.9 g H2O
B. 54.4 g N^2
C. 89 g CCI4
D. 11 g C6H12O6
Answers
Answer:
To find the number of molecules first find the number of moles.
number of moles (n) = mass / molar mass (M)
then use the formula
N = n × L
where n = number of moles
N = number of entities
L = Avogadro's constant = 6.02 × 10^23entities to find the number of molecules
A. 4.9 g H2O
m = 4.9g
M = (2*1)+(16×1) = 2 + 16 = 18g/mol
n = 4.9/18 = 0.272mol
N = 0.272 × 6.02 × 10^23
= 1.6374*10^23 molecules of H2O
B. 54.4g of N2
m = 54.4g
M(N2) = 14×2 = 28g/mol
n = 54.4/28 = 1.942mol
N = 1.942 * 6.02*10^23
= 1.1690*10^24 molecules of N2
C. 89 g CCI4
m = 89g
M(CCl4) = 12 + (35.5 × 4) = 154g/mol
n = 89/154 = 0.577mol
N = 0.577 × 6.02 × 10^23
= 3.473*10^23 molecules of CCl4
D. 11 g C6H12O6
m = 11g
M(C6H12O6) = (12×6)+(12×1)+(16×6) =
180g/mol
n = 11/180 = 0.0611mol
N = 0.0611 × 6.02×10^23
= 3.678*10^22 molecules of C6H12O6
Hope this helps