Answer:
26.8°C
Explanation:
For this reaction, the equation can be computed as follows:
[tex]2HCl_{(aq)}+ Ba (OH)_{2(aq)} \to BaCl_{2(aq)} + 2H_2O_{(l)} \ \ \ \ \ \ \Delta H= -118 \ kJ[/tex]
Now, Given that:
100.0 mL of 0.500 molarity (M) of HCl reacted with 300.0 mL of 0.100 molarity of Ba(OH)2.
The next process is to determine the number of moles of the solute:
For HCl:
no of mole = [tex]\dfrac{0.500 \times 100}{1000}[/tex]
= 0.05 mol
For Ba(OH)2:
no of mole =[tex]\dfrac{0.100\times 300}{1000}[/tex]
= 0.03 mol
From the reaction, at the reactant side, we will see that two moles of HCl reacted with one mole of Ba(OH)2.
It implies that HCl is the limiting agent since it is in lesser quantity.
Similarly, the heat given out of the system is 118 kJ for each two moles of HCl with one mole of B(OH)2.
Hence, for 0.05 moles of HCl, the heat emitted out is:
[tex]= 0.05 mole \times ( \dfrac{118 \ kJ}{2 \mol})[/tex]
= 2.95 kJ
Let's recall from the question that:
the heat emitted was moved to the final mixture with mass =400g
the specific heat capacity = 4.18 J/°C g
Initial temperature = 25°C
∴
Using the formula;
ΔH = mass × specific heat capacity × (T_f - T_i)
Then, replacing the values, we have:
2.95 kJ = 400 g × 4.18 J/°C g × ( T_f - 25° C)
2950 J = 400 × 4.18 J/°C × ( T_f - 25° C)
[tex]T_f = \dfrac{2950 \ J}{400 \times 4.18 \ J/^0 C}+25^0\ C[/tex]
[tex]\mathbf{ T_f = 26.8^0 \ C}[/tex]
define SI unit system
Answer:
The SI base units are the standard units of measurement defined by the International System of Units (SI) for the seven base quantities of what is now known as the International System of Quantities: they are notably a basic set from which all other SI units can be derived.
PLEASE HELP 100 POINTS!!!!!! Read the short section below on the difference between everyday experience and science.
Everyday Experience vs. Science
The process of science can sound very similar to how you experience life. However, everyday human experience and science are very different. Science has procedures with special conditions and rules for making observations. People do not have such restrictions in everyday life. Individuals can witness events, make adjustments, and practice trial and error similar to scientists. Unlike scientists, individuals are free to do tests using any method they choose. People can try different ways of doing things like driving, cooking, and working out. Then, they can modify their procedures to get the results they want.
Unlike the public, scientists perform trial and error by doing carefully designed experiments. Their experiments require the proper methods and tools. In addition, their projects undergo review by their peers. Even though some science observations take place in a natural environment, they do so for a brief period of time or in a limited area. Much of science must be completed in an artificial environment to reduce the number of variables that can affect the experimental process. Though scientists change factors within their research, they do not usually change the results of their experiments. Good scientists ensure that their own wants and preferences do not affect the knowledge they discover.
Despite having different purposes and abilities, both everyday experiences and science are important. Many key scientific discoveries were started with someone’s everyday experiences. Everyday experiences influence the decisions and direction people take in life. The steps scientists follow in investigations influence information; they provide a way of knowing about the world and explaining how it works.
In your opinion, are scientists born or made? How can everyday people challenge or extend scientific ideas and make scientific discoveries? Use excerpts from the section to explain and support the reasoning behind your answer.
Answer:
Scientist are born the most likely people to become scientist have naturally accelerated thought process from a young age
Dissolve 27.2 grams of CaO and Fe203 mixture with an excess of 500ml dd HCl 2M. a) Calculate each substance in the original mixture b) Calculate the mass of each anhydrous salt obtained after the reaction
Answer:
nutrion jsbsjsb. wjjshsjs. wjsh
8th Grade Middle School Science
You measure the mass of an apple using a balance. You get these three measurements:
Trial 1: 167.0 g
Trial 2: 166.9 g
Trial 3: 167.2 g
You know that the true mass of the apple is 172 g. Describe your results in terms of precision and accuracy. Explain your answer.
Answer:
Your results are precise, but not very accurate.
Explanation:
The results are precise because each weight is close to the next. The weights are not accurate because they are pretty far from the true mass.
Answer:
The results of the three trials are accurate because there all very close to the correct mass of the apple is, 172 g. The results are precise because each weight is close to the next. The weights are not accurate because they are pretty far from the true mass.
Which of these equations for the
formation of an oxide ion is correct?
0 + 2e" --> 02-
0 --> 02- + 2e
Answer:
A
Explanation:
Because of the cathode
The diameter of neutral atoms generally decreases going left to right across one period on the periodic table. What change causes this decrease in diameter of atoms?
Explanation:
Atomic size gradually decreases from left to right across the periodic table because within a period of elements, all electrons are added to the same shell. However, at the same time, protons are being added to the nucleus, making it more positively charged. The effect of increasing proton number is greater than that of the increasing electron number. Therefore, there is a stronger nuclear attraction. This means that the nucleus attracts the electrons more strongly, pulling the atom's electron shells closer to the nucleus. As a result, the atomic diameter of the atom decreases.
can someone tell me what does the numbers in the circle mean? and how do I find it?
Answer:
Electronic configurations of three magnesium atoms and two nitrogen atoms.
[tex]{ \sf{.}}[/tex]
The chemical elements display periodicity when they're arranged according to
A: Atomic Weight
B: Atomic Mass
C: Atomic Volume
D: Atomic Number
Answer:
HEY YOUR ANSWER IS ATOMIC NUMBERWhich of the following is true of science? (2 points)
It can be disproven by philosophy and religion.
It does not change after new evidence is discovered.
It is based on the personal opinions of scientists.
It is based on testable and replicable evidence.
Answer:
It is based on testable and replicable evidence.
What information does the specific heat capacity give about a substance?
A. How much energy is needed to raise its temperature
B. How much heat is released when it changes phases
C. How much energy is needed to overcome an activation energy
O
0
D. How much heat is stored in its chemical bonds
Specific heat capacity tells about how much energy is needed to raise its temperature.
What is specific heat capacity?
Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.
It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.
It is given by the formula ,
Q=mcΔT
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Questions: Answer on the following slide.
1. What is needed from adults when conducting experiments at home?
2. Why are chemicals so dangerous?
3. What should always be followed when conducting experiments?
4. What is science?
what are the disruption of carbon cycle
Answer:
Human activities have a tremendous impact on the carbon cycle. Burning fossil fuels, changing land use, and using limestone to make concrete all transfer significant quantities of carbon into the atmosphere.
Is water the only liquid? If not, name 5 more
Answer:
Is water the only liquid? If not, name 5 more
Water, ethanol, household bleach, blood, paint, milk, gasoline, mineral oil, acetone and butyl alcohol are examples of liquids. Liquids' properties allow them to flow or be poured easily into containers, lava
water is not the only liquid.
Answer:
apple juice, milk, smoothie, blood, urine
Which statement is true?
1. Heat refers to a process.
2. Thermal energy refers to a process.
3. Thermal energy refers to a single particle.
4. Heat refers to a quantity.
Answer:
4. Heart refers to a quantity
Answer:
Heat Refers To A Process
is a dibasic acid the same as a strong acid
Answer:-
Since all the acid molecules have split into ions, there will be more H+ ions in a strong acid than a weak acid, hence it's pH is lower! E.g. Hydrochloric acid HCl, nitric acid HNO3. If one mole of an acid is neutralised by 2 moles of NaOH, then the acid is dibasic!
How old is a bone if it presently contains 0.3125g of C-14, but it was estimated to have originally contained 80.000g of C-14?
Half-life of C-14 is 5730 years
The age of the bone is the time taken to decay carbon -14 from a mass of 80 g to 0.3125 g. The decay time is 46209 years. That is the age of the bone.
What is carbon dating?Carbon -14 isotope is radioactive and undergoes nuclear decay by the emission of charged particles. The age of a fossil sample which contains carbon -14 can be determined using the time of decay.
Half life of C-14 = 5730 years
decay constant k = 0.693 / 5730 = 0.00012 yr⁻¹
Initial amount of C-14 = 80 g
final amount = 0.3125 g
Then the time taken to decay 80 g to 0.3125 g is t = 1/k ln (80/0.312)
t = ln (80/0.312) / (0.00012 yr⁻¹)
= 46209 years.
Therefore, the age of the bone is 46209 years.
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c. The reaction Br2 (l) --> Br2 (g) has ΔH = 30.91 kJ/mol and ΔS = 93.3 J/mol·K. Use this information to show (within close agreement) that the boiling point of bromine is 332 K.
The boiling temperature of bromine is 331.29 K
Explanation:
From the question given above, the following data were obtained:
Br₂ (l) —> Br₂(g)
Enthalpy change (ΔH) = 30.91 KJ/mol
Entropy change (ΔS) = 93.3 J/mol·K
Boiling temperature (T) =?Next, we shall convert 30.91 KJ/mol to J/mol. This can be obtained as follow:
1 KJ/mol = 1000 J/mol
Therefore,
30.91 KJ/mol = 30.91 × 1000
30.91 KJ/mol = 30910 J/mol
Thus, 30.91 KJ/mol is equivalent to 30910 J/mol.
Finally, we shall determine the boiling temperature of bromine. This can be obtained as follow:
Enthalpy change (ΔH) = 30910 J/mol
Entropy change (ΔS) = 93.3 J/mol·K
Boiling temperature (T) =?ΔS = ΔH / T
93.3 = 30910 / T
Cross multiply
93.3 × T = 30910
Divide both side by 93.3
T = 30910 / 93.3
T = 331.29 K
Thus, the boiling temperature of bromine is 331.29 K
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If oxygen causes fire to burn, why didn't the world explode when fire burns at a particular place...since oxygen is everywhere...? Explain...
Answer:
Oxygen does not burn. It is not flammable, but it is an oxidizer.
Explanation
I think you are misunderstanding what is meant by "fire burns up air". Fire does use oxygen when it burns. But it also produces carbon dioxide. An oxygen molecule has two oxygen atoms in it. Fires use this to produce carbon dioxide by adding a single carbon atom from the fire’s fuel (wood, for instance).
hope it'll help:)
If ya could change somethin bout ya previous science classes what would it be?
If I could change something in my previous science classes, it would have been the fact that I struggled in the question concerning exponents. It was simple one, but I don't know how I didn't understood that. For example, if there is a question with a calculation "xy²", then I would first multiply x and y, and then calculate the exponent. I did 3 of the questions wrong because of this, it was when I was in 7th grade. I wish I had not done this kind of silly mistake. I an in 10th grade and understand it well now, though.
what is filtration? ㅜㅜ ㅜㅜ
Answer:
filtration is the process of using a filter to remove solids from liquids or gasses.
Example:
an example of this is tea.
what are the useful of carbon dioxide?
Perform the following operation
and express the answer in
scientific notation.
3.490x10-3 + 1.100x10-2
[?] 10^[?]
Answer:
1449 × 10 ^-5
Explanation:
3.490x10-3 + 1.100x10-2
= 0.01449
0.01449× 10^ 5
= 1449
Answer:
1.449x10^-2
Explanation:
write any two conditions at which a body of certain mass weightless
Answer:
A body becomes weightless in a zero-gravity scenario and when a force is applied to a body that is equal and opposite to the force of gravity. If the body is falling only under the influence of gravity.
Answer:
A body becomes weightless in a zero-gravity scenario and when a force is applied to a body that is equal and opposite to the force of gravity.If the body is falling only under the influence of gravity.
The number of particles in 8 g 02 molecules are
Answer:
cholesterol
Explanation:
gsdhudbdjbfmcjfjdncbdhdnhdndbchdncbdn f f ff
What is the pressure of 4 moles of helium in a 50 L tank at 308 K?
Use PV = nRT.
A. 24.64 atm
B. 0.13 atm
O C. 0.51 atm
D. 2.02 atm
Answer:
D
Explanation:
P = Pressure
V = Volume
n = Moles
R = .08206 (because we're using liters)
T = Temperature (as K)
P(50) = (4)(.08206)(308)
P(50) = 101.09792
Divide both sides by 50
P(50)/50 = 101.09792/50
P = 2.0219584
Answer:
[tex]\boxed {\boxed {\sf D. \ 2.02 \ atm}}[/tex]
Explanation:
We are asked to find the pressure of helium gas using the ideal gas law.
[tex]PV= nRT[/tex]
In this formula P is the pressure, V is the volume, n is the number of moles of gas, R is the universal gas constant, and T is the temperature.
The pressure is unknown and we are solving for it. The volume is 50 liters, there are 4 moles of helium gas, the universal gas constant is 0.08206 L *atm/ mol * K, and the temperature is 308 Kelvin.
[tex]\bullet \ V= 50 \ L \\\bullet \ n= 4 \ mol \\\bullet \ R = \frac {0.08206 \ L * atm}{mol *K}\\\bullet \ T= 308 \ K[/tex]
Substitute these values into the formula.
[tex]P * 50 \ L= 4 \ mol * \frac {0.08206 \ L * atm}{mol *K} * 308 \ K[/tex]
Multiply on the right side. The units of moles (mol) and Kelvin (K) cancel each other out.
[tex]P* 50 \ L = 4 * 0.08206 \ L *atm * 308[/tex]
[tex]P*50 \ L =0.32824 \ L * atm *308[/tex]
[tex]P* 50 \ L = 101.09792 \ L * atm[/tex]
We are solving for the pressure, so we must isolate the variable P. It is being multiplied by 50 liters. The inverse operation of multiplication is division, so divide both sides by 50 L.
[tex]\frac {P* 50 \ L}{50 \ L} = \frac {101.09792 \ L * atm}{50 \ L}[/tex]
[tex]P= \frac {101.09792 \ L * atm}{50 \ L}[/tex]
The units of liters (L) cancel.
[tex]P= \frac{101.09792}{50 } \ atm[/tex]
[tex]P= 2.0219584 \ atm[/tex]
If we round to the nearest hundredth place the 1 in the thousandth place tells us to leave the 2 in the hundredth place.
[tex]P \approx 2.02 \ atm[/tex]
The pressure is approximately 2.02 atmospheres and choice D is correct.
what is the formula of water
Answer:
The formula of water is H20
6- the chemical formula of carbonate salt contain monovalent cation is ..........
O XCO3
O X2HCO3
O X2CO3
O X(HCO3)2
7- after adding sodium hydroxide into hydrochloric acid, pH will
O Increases
O decreases
O remains constant
8- the reaction between calcium hydroxide and Nitric acid forming ........
o Ca(NO2)2
O Ca(NO3) O Ca(NO3)2
o Ca(NO2)
Answer:
6-
[tex]{ \sf{XCO _{3} }}[/tex]
because X has only one positive charge.
7-
[tex]{ \sf{increases}}[/tex]
because there is increase in hydroxyl ions which decrease the acidity or hydrogen strength of hydrochloric acid.
8-
[tex]{ \sf{Ca(NO _{3} ) _{2} }}[/tex]
Calcium has a valency of 2 and nitrate ion radicle has valency of 1
Which atom's ionization energy is greater than that of phosphorus (P)?
A. Ba
B. K
C. As
D. CI
Answer:
Chlorine
Explanation:
the ionization increases as you get closer to the top right. since chlorine (Cl) is the only one of the answer choices that is closer to the top right corner compared to phosphorous (P), that is the answer.
Answer:
cl
Explanation:
because ionization energy decrease from left to right
PLEASE HELP ME I DONT EVEN KNOW IF I CIRCLES THE RIGHT THING!!
Answer:
why are anime and cartoons awesome? wt..f
Explanation:
I dont got that are you serious or making fun?
When a single salt crystal is added to a cool liquid, large crystals form. Which statement about the original cool liquid is correct?
A) The liquid is a heterogeneous mixture because the crystals can be easily separated from the liquid
B) The liquid is a pure substance because it was made up of a single compound
C) The liquid is a pure substance because it was uniform before the crystal was added
D) The liquid is a homogenous mixture because the substance that formed the large crystals was uniformly dissolved
The liquid is a homogeneous mixture because the substance that formed the large crystals was uniformly dissolved.
A solution is composed of a solute and a solvent. A solution is a typical example of a homogeneous mixture.
We define a solution as any combination of solute and solvent. A solution can be regarded as a homogeneous mixture since the solute is uniformly distributed throughout the solution. The solute and solvent constitutes one phase.
When a salt crystal is added to the solution, crystallization is induced and large crystals of solute form.
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A salt crystal is a cubic form of sodium chloride that is closely bounded together by the reaction of sodium and chlorine ions during electrovalent bonding.
Taking a look at a heterogeneous mixture;
It refers to the mixtures that are not thoroughly mixed and uniform in composition.
On the other hand, homogeneous mixtures are formed when a substance i.e. solute (here, it is the salt crystal) is being added to a cool liquid(solvent) is thoroughly mixed.
From the given information, we are being told that when this single salt crystal is added to the cool liquid, large crystals are formed.
This implies that the formation of large crystals is brought about by the action of crystaliization rendering the liquid to be a homogeneous mixture.
We can therefore conclude that the correct statement about the original cool liquid is in Option D.
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