Answer: an exothermic reaction in which entropy increases
Explanation:
Spontaneous reactions normally cause an increase in entropy and are also exothermic.
The specific heat of copper is 0.385 J/gºC. A 95.0 g block of
copper is heated to 77.9°C and placed into a calorimeter that
a
contains 42.0 mL of water at 20.4°C. Assuming no heat loss,
what will be the final temperature of the copper and water?
The final temperature of the copper and water in the calorimeter given the data is 30.3 °C
Data obtained from the questionSpecific heat capacity of copper (C꜀) = 0.385 J/gºCMass of copper (M꜀) = 95 gTemperature of copper (T꜀) = 77.9 °C Mass of water (Mᵥᵥ) = 42 mL = 1 × 42 = 42 gTemperature of water (Tᵥᵥ) = 20.4 °CSpecific heat capacity of the water (Cᵥᵥ) = 4.184 J/gºC Equilibrium temperature (Tₑ) =? How to determine the equilibrium temperatureHeat loss = Heat gain
MᵥᵥC(Tᵥᵥ – Tₑ) = M꜀C(Tₑ – M꜀)
95 × 0.385 (77.9 – Tₑ) = 42 × 4.184(Tₑ – 20.4)
36.575(77.9 – Tₑ) = 175.728(Tₑ – 20.4)
Clear bracket
2849.1925 – 36.575Tₑ = 175.728Tₑ – 3584.8512
Collect like terms
2849.1925 + 3584.8512 = 175.728Tₑ + 36.575Tₑ
6434.0437 = 212.303Tₑ
Divide both side by 212.303
Tₑ = 6434.0437 / 212.303
Tₑ = 30.3 °C
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NHCI(s) = NH3(g) + HCl(g) at 427°C, Kp = 4.8. Calculate Kc
[tex]\tt Kp=Kc(RT)^{\Delta n}[/tex]
NH₄Cl (s) ⇔ NH₃ (g) + HCl (g)
Δn = 2 (gas only)
R = 0.082
T = 427 + 273 = 700 K
4.8 = Kc (0.082 x 700)²
Kc = 1.45 x 10⁻³
Match the properties to the types of compounds they characterize.
Drag each label to the correct location on the table,
lonic Compounds
Metallic Compounds
Both
FREEBIE
The correct match of the compounds to their characters are:
Ionic compound: made of positive-negative ion and break into pieces easily.
Metallic compound: can be hammered into different shapes and conduct electricity.
Both: are held together with opposite ions, the high boiling point.
What are compounds?Compounds are made up by mixing two or more metals or non-metals.
Different compounds have different chemical properties.
Thus, the Ionic compound: is made of positive-negative ion and break into pieces easily.
Metallic compound: can be hammered into different shapes and conduct electricity.
Both: are held together with opposite ions, the high boiling point.
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1. What is the total mass if you add 6.00g + 30.0mg + 0.50kg.
Answer:
0.50603kg when you add given masses
Which of the following has more than one kind of monomer in its repeating unit? homodimer copolymer codimer homopolymer
Copolymer have more than one kind of monomer in its repeating unit.
What are Copolymers ?Those polymers that have more than one kind of monomer in its repeating unit are called Copolymers.
These are useful to modify the properties of polymers that needs more strength , durability etc.
It is a way of improving mechanical properties of a polymer .
A copolymer formed from two dissimilar molecules (as two olefins) is a codimer and the homopolymer and homodimer as the name suggest are made of one similar kind of monomers.
Copolymer have more than one kind of monomer in its repeating unit.
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2.00L of gas is collected at 25.0 C and 745.0 mmHg What is the volume of this gas at STP?
Answer:
1.79
Explanation:
crude oil is in soild form true or false
Answer:
false
Explanation:
it is a complex mix of hydrocarbons that caan only occur in liquid, gaseous, or solid form. Crude oil is often liquid form. But also includes gas and solid's known as which is found only in certain sands, so false is you're answer.
Hello!!
Who was Neil Bohr?
Explain the theory he introduced.
Answer:
In 1913, Niels Bohr proposed a theory for the hydrogen atom, based on quantum theory that some physical quantities only take discrete values. Electrons move around a nucleus, but only in prescribed orbits, and if electrons jump to a lower-energy orbit, the difference is sent out as radiation.
Carlos is making phosphorus trichloride using the equation below.
2P +3Cl2 → _PC13
What coefficient of PClz would show that the law of the conservation of mass is represented in the chemical
equation?
4
3
2
Answer:
C.) 2
Explanation:
Chemical equations, in a way, can be seen as algebraic equations. Cl2 is a molecular structure, so, there are two Cl atoms. 3Cl2 means 3, Cl2 molecules. So, if we think of it as adding up all the atoms, we will get, 2 P atoms and 6 Cl atoms. Now to convert. The Law of the Conservation of Mass basically says you can't add or subtract atoms out of nowhere, so the number of atoms has to stay the same when it's being converted. We need to place a coefficient with PCl3. If we look at PCl3, it shows us that there are three Cl atoms and one P atom. And looking back at how many atoms there were on the left side of the equation, we just need to double the atoms of atoms so it will be equal. So, the answer is C.) 2
BRAINLIEST PLEASE!!
Answer:
the answer is C
Explanation:
How much water must be added to 6.0 M silver nitrate in order to make 500 mL of 1.2 M solution?
The amount of water that must be added to 6.0 M silver nitrate to make 500mL of 1.2 M solution is : 2000 mL
Given data :
Concentration of siilver nitrate ( M₁ ) = 6.0 M
volume of solution ( V₁ ) = 500 mL
Conc of solution ( M₂ )= 1.2 M
Determine the amount of water that must be addedwe will apply the equation below
M₁V₁ = M₂V₂ ---- ( 1 )
where : V₂ = V₁ + water added ---- ( 2 )
V₂ ( Final volume ) = ( M₁V₁ ) / M₂
= ( 6 * 500 ) / 1.2
= 2500 mL
Back to eqaution ( 2 )
2500 mL = 500 mL + added water
therefore ; added water = 2500 - 500
= 2000 mL
Hence we can conclude that The amount of water that must be added to 6.0 M silver nitrate to make 500mL of 1.2 M solution is : 2000 mL.
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Critically discuss the refusal/unwillingness of some individuals to answer questions to put them by authorized Stats SA officials
People refuse to answer questions from authorized Stats SA officials because they don't want to reveal confidential information.
What does official stats refer to?An official Stats is an official who has the function of asking citizens for different information in order to establish general statistics for all citizens.
Why don't people answer your questions?Some people refuse to answer questions out of mistrust, because they don't want to share personal information.
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For a plane to make a turn , a .......is required to change the motion in direction of that turn.
Answer: The answer is force.
Explanation:
Newtons 3rd law is from an action, there should be a reaction. so the planes moving it turns with force. ( this ould get a Brainliest answer)
A man takes 600 mg ibuprofee tables for pain and swelling related to an anide spazin The mediamber of tablets he can
take in a 24 h period to reach the maxime daily dose is 4 tablets. What is the maximum daily dose is ligams?
mati daily doses
Answer:
what is your questions I didn't understand
The equation shows the overall chemical reaction for photosynthesis, the process that plants use to make food from sunlight. Which statement explains why this is an endothermic reaction? 6CO2 + H2O + energy ---> C6H12O6 + 6O2
A) Water is one of the reactants.
B) A gas is released as one of the products.
C) The sugar dissolves in water.
D) Energy in the form of sunlight must be added.
During photosynthesis green plants use solar energy to produce fuel hence 'Energy in the form of sunlight must be added' that is option D is the correct option.
Why is photosynthesis an endothermic reaction?Photosynthesis is an endothermic reaction because green plants use solar energy in the form of sunlight, along with water and carbon dioxide in the air, to produce their food in the form of glucose.
Endothermic reactions are chemical reactions where the reactants utilize heat energy from the surroundings to form products.
Since energy as sunlight is used in the photosynthesis reaction, 'Energy in the form of sunlight must be added' that is option D is the correct option.
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Points + brainalist
Answer:
the total mass of product is equal to total mass of the reactance
I showed maturity when I
I showed maturity when I turn 13 year old
Water is the universal solvent and we have seen how salts, like NaCl, dissolve in water. Many other molecules dissolve in water as well: sugar is a good example. A salt solution will conduct electricity but a sugar solution will not. Let's use the sugar, sucrose, as an example that readily dissolves in water, but the solution does not conduct electricity. Compare this dissolving process of sucrose with that of NaCl to explain why one is an electrolyte and the other is not. Choose ALL that apply.
Answer:
Explanation:
Salt (sodium chloride) is made from positive sodium ions bonded to negative chloride ions. Water can dissolve salt because the positive part of water molecules attracts the negative chloride ions and the negative part of water molecules attracts the positive sodium ions.
Specific Heat Practice
1. How much heat energy is needed to raise the temperature of 540 g of water from 32.00C
to 95.00C? (C=4.186 J/gºC)
Answer:
See below
Explanation:
Specific Heat of water = 4.186 J/(g-C)
J/(g-C) multiplied by g and C results in J
4.186 * 540 * (95-32) = 142 407 .72 J
What mass of Ca(OH)2 must be dissolved in 0.504 L of a solution to make a 0.56 M solution?
0.28 g
21 g
1.1 g
0.90 g
20.91200832 g of [tex]Ca(OH)_{2}[/tex] must be dissolved in 0.504 L of a solution to make a 0.56 M solution.
What is the molarity of a solution?
Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.
[tex]Molarity = \frac{Mole \;of \;solute}{Volume \;of \;solution \;in \;litre}[/tex]
Given data:
The volume of solution= 0.504 L
Molarity of [tex]Ca(OH)_{2}[/tex] = 0.56 M
Step 1: Calculating the mass of [tex]Ca(OH)_{2}[/tex]
Putting the given values in the equation.
[tex]Molarity = \frac{Mole \;of \;solute}{Volume \;of \;solution \;in \;litre}[/tex]
[tex]0.56 M = \frac{Mole \;of \;solute}{0.504 L }[/tex]
Moles of solute = 0.28224
[tex]Moles \;of \;solute= \frac{Given \;mass}{Molar \;mass}[/tex]
Molar mass of [tex]Ca(OH)_{2}[/tex] = 74.093 g/mol
Now, put the values in the formula.
[tex]Moles \;of \;solute= \frac{Given \;mass}{Molar \;mass}[/tex]
[tex]0.28224 mol= \frac{Given \;mass}{74.093 g/mol}[/tex]
Mass of [tex]Ca(OH)_{2}[/tex] =20.91200832 g
Hence, 20.91200832 g of [tex]Ca(OH)_{2}[/tex] must be dissolved in 0.504 L of a solution to make a 0.56 M solution.
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6. Which describes particles or electromagnetic radiation emitted from the nucleus during
radioactive decay ?
a) harmless nuclear fallout
b) nuclear radiation
c) transmutation
d) daughter nuclides
Answer:
A harmless nuclear fallout
Explanation:
just did this
If the balanced chemical reaction for the formation of Li2O is 4 Li(s) + O2(g) → 2 Li2O(s), how many molecules of Li2O(s) would you produce if you used up 6 atoms of Li(s)?
The molecules of Li₂O that would produce if you used up 6 atoms of Li(s) is 3.
What is Lithiumdioxide?It is an unstable inorganic and radical compound, used in the manufacture of glass and ceramic.
The balanced equation
[tex]\rm 6 Li(s) + O_2(g) \rightarrow 3 Li_2O(s)[/tex]
If the atoms of lithium moves up to 6 the lithium oxide molecules will be 3, as you can see in the equation.
Thus, the molecules of Li will be 3.
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why we breath in oxygen but not nitrogen which is having big percentage
Answer:
Breathing an atmosphere of pure oxygen would damage the delicate tissues and blood vessels in our lungs, so it's a good thing that most of our atmosphere is nitrogen.Nitrogen is a fairly inert chemical (it does react, but not nearly as much as oxygen - this is why it is fairly stable in the atmosphere, whereas oxygen has to constantly be regenerated by photosynthesis).
Hope it Helps :))
What is small p value and large p value indicates for
Answer:
P value is commonly used. The prevalent use of P values to summarize the results of research articles could result from the increased quantity and complexity of data in recent scientific research.
Explanation:
Which sentence best describes the shapes of the moon over the course of about a month? (2 points)
Group of answer choices
Over the course of about a month, the shape of the moon does not change.
Over the course of about a month, the shape of the moon changes from a crescent, to a half circle, to three quarters of a circle, to a full circle.
Over the course of about a month, the shape of the moon changes from a crescent, to a full circle, to a half circle, and finally to three quarters of a circle.
Over the course of about a month, the shape of the moon changes from a full circle, to a crescent, and back to a full circle.
The sentence best describes the shapes of the moon over the course of about a month is over the course of about a month, the shape of the moon changes from a full circle, to a crescent, and back to a full circle.
What is full moon?The moon when looks like a full circle and having the highest brightness over its life cycle is called the full moon.
The full moon, crescent, half moon or no moon are all the stages of a Moon's lifecycle.
Over a period of 14 days, moon changes from a full moon to no moon. In the another 14 days, no moon changes to full moon. This cycle keeps on going for years and years.
Thus, the sentence best describes the shapes of the moon over the course of about a month is over the course of about a month, the shape of the moon changes from a full circle, to a crescent, and back to a full circle.
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Answer:
Over the course of about a month, the shape of the moon changes from a full circle, to a crescent, and back to a full circle.
Explanation:
Points + Brainalist
Answer:
I think A it looks to be the answer
Explanation:
sorry if wrong
I will mark brainliest
[tex]S_8 +120_2[/tex] → [tex]8SO_3[/tex] has been balanced correctly.
What is a balanced chemical equation?A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.
[tex]S_8 +120_2[/tex] → [tex]8SO_3[/tex] has been balanced correctly and the rest are not balanced.
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In an electric toaster, electricity passes through thin metal wires (called filaments) inside the toaster, causing the wires to glow and heat up. The heat given off by the filaments then toasts the bread.
If 500 kilojoules of electricity are supplied to a toaster, which choice below could represent the total amount of heat energy given off by the filaments of the toaster?
A.
480 kilojoules
B.
520 kilojoules
C.
505 kilojoules
D.
630 kilojoules
Answer:
a. 480 kilojoules
Explanation:
good luck have a nice day
An arrangement of electrons that tells us how many total electrons are in an atom or ion as well as the outermost
electrons is called:
Electron configuration
Periodic table
Isotope configuration
Valance electrons
An arrangement of electrons that tells us how many total electrons are in an atom or ion as well as the outermost is called Electronic configuration.
What is electronic configuration?Electronic configuration is the arrangements of electrons in the orbitals of an atoms and this shows the total number of atoms present in the atoms orbits and it shows the different energy levels around an atomic nucleus.
Therefore, An arrangement of electrons that tells us how many total electrons are in an atom or ion as well as the outermost is called Electronic configuration.
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Calculate the number of hydrogen atoms in 58.1 grams butane.
This question involves the concepts of molar mass and molecular formula.
The number of hydrogen atoms in 58.1 grams butane are "10".
No. of Hydrogen AtomsThe molecular formula of butane is C₄H₁₀. And the molar mass of butane is 58.1 grams. Molar mass id the mass of the single molecule of a compound. Hence, it is very clear from the molecular formula and molar mass of butane that 58.1 grams of butane contains 10 atoms of hydrogen. Mathematically,
58.1 grams butane contains = 10 hydrogen atomsLearn more about molar mass here:
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Sodium hydroxide reacts with sulfuric acid according to the equation:
NaOH + H2SO4 + Na2SO4 + H2O
27. Name this type of reaction:
28. Balance the chemical equation:
Answer:
27) Double replacement
28) 2NaOH + H2SO4 --> Na2SO4 + 2H2O
