Answer:
Methane is made up discrete molecules hence it adopts a simple molecular structure with weak vanderwaals forces of attraction while Silicon dioxide adopts a giant covalent structure with strong silicon to oxygen bonds.
Hence Silicon dioxide has a high melting point than methane.
1. What is the new volume of a sample of neon if 5.23 L of the gas, which was originally at 214 mmHg, is compressed until the pressure increases to 796 mmHg?
2. When a balloon containing 635 mL of air is taken from sea level (at standard pressure) to a higher altitude, the balloon expands to 829 mL. What is the air pressure at this new altitude (in atm)?
3. A 465 mL sample of gas at 55°C is cooled to standard temperature (0°C). What is its new volume?
4. To what Celsius temperature does 750. mL of gas originally at −12°C need to be heated to bring the volume to 2.10 L?
5. The pressure in a car tire is 217 kPa at 24°C. After being driven on a hot summer day, the pressure in the tire increases to 258 kPa. What is the Celsius temperature of the air in the tire?
6. A gas sample originally at −39°C is heated to standard temperature (0°C), at which point its pressure is measured to be 808 mmHg. What was the original pressure of the gas?
7. A 400. mL sample of gas at 15°C and 113 kPa is heated to 227°C while expanding into a 900. mL container. What is the new pressure of the gas in kPa?
8. 2.50 g of CO2 gas is confined in a rigid cylinder at a pressure of 4.65 atm. If 0.42 g of gas is released from the cylinder, what is the new pressure?
Please help I'm so bad at chemistry
Here are attached photos, I don’t think they ar links, lmk if they don’t work
in the answering section it didn’t show me the full question so I only saw a little of question 5. Hopefully you get the idea of how to identify which equations to use tho! Good luck!
I'LL GIVE BRAINLIEST PLS HELP
How does a new DNA molecule ensure that it has the same nucleotide sequence as the original DNA?
Answer:
This strand contains nucleotides that are complementary to those in the template sequence. Base pairing ensures that the sequence of nucleotides in the existing template strand is exactly matched to a complementary sequence in the new strand, also known as the anti-sequence of the template strand
An endothermic dissolution process a. absorbs energy as heat and has positive enthalpy of solution. b. releases energy as heat and has positive enthalpy of solution. c. absorbs energy as heat and has negative enthalpy of solution. d. releases energy as heat and has negative enthalpy of solution.An endothermic dissolution process a. absorbs energy as heat and has positive enthalpy of solution. b. releases energy as heat and has positive enthalpy of solution. c. absorbs energy as heat and has negative enthalpy of solution. d. releases energy as heat and has negative enthalpy of solution.
Answer:
a. absorbs energy as heat and has positive enthalpy of solution.
Explanation:
A reaction can either be exothermic or endothermic. An endothermic reaction, as the dissolution described in the question, is that which absorbs heat energy from the surroundings in order to start the reaction.
Because an endothermic reaction makes heat lost from the surroundings, the enthalpy (∆H) of the solution will be positive (+). ∆H is got by finding the difference between the enthalpy of the reactants and products and since the enthalpy of a product in endothermic reaction is more, the enthalpy change (∆T) will be positive.
Please help this is due today! 5-11-2021
Observe the chemical reaction below, and identify if the equation is balanced or not. If it is not balanced, then what coefficient should you place for the reactants and products? Justify with scientific reasoning.
Mg + O2---------> MgO
Make sure to include the following details in your answer in complete sentences:
- Is the chemical reaction balanced?
- Is it following the law of conservation of mass, why is not following?
- What can you do to make sure that the equation becomes balanced and follow the law?
Answer:
- The chemical reaction is not balanced. There is two oxygens on the reactant's side while there's only one oxygen on the products side.
- I would not say it's following the law of conservation of mass as it's not a balanced equation.
- To balance this equation, you would need to add the coefficient of '2' to Magnesium (Mg) on the reactants side, and add the coefficient of '2' to the products side. This would make it so that there's 2 Mg's and 2 O's on both the reactant's side and products side.
edit: I hope this helped you in some way. ^^
En una botella hay 2x10 25 moléculas de vinagre puro ¿Cuántos mol y cuántos gramos de esta sustancia habrá en la botella?
Answer:
33.2 moles y 1994 gramos.
Explanation:
¡Hola!
En este caso, dado que es posible para nosotros relacionar moles con gramos por medio de la masa molar y moléculas con moles por medio del número de Avogadro, resulta factible para nosotros primero calcular las moles en las moléculas dadas y de esta manera luego calcular los gramos, teniendo en cuenta una masa molar de 60.05 g/mol ya que el vinagre se puede estudiar como ácido acético (CH3COOH):
[tex]2x10^{23}molec*\frac{1mol}{6.022x10^{23}molec}=33.2mol[/tex]
Seguidamente, calculamos los gramos:
[tex]33.2mol*\frac{60.05g}{1mol}=1994g[/tex]
¡Saludos!
Describe the process used to dilute a stock solution?
Answer:
Heyaa!! I'm *✧･ﾟ:*Pinky!! *:･✧ And i'm here to inform you that you're answer is...
Explanation:
✧･ﾟ: *✧･ﾟ:**:･ﾟ✧*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:･ﾟ✧*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:✧*:✧✧･ﾟ:*✧･ﾟ:*✧･ﾟ:
*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:･ﾟ✧*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:･ﾟ✧*:･ﾟ*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:✧*:✧*:･ﾟ･ﾟ
*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:･ﾟ✧*:･ﾟ✧ !!!!! Answer: add more solvent to decrease the concentration. A stock solution is a concentrated form of a particular chemical. To make a solution from the stock solution, a required amount of the stock solution has to be taken out and this will be diluted with pre-calculated amount of the correct solvent !!!! *:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:･ﾟ✧*:･ﾟ✧
✧･ﾟ: *✧･ﾟ:**:･ﾟ✧*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:･ﾟ✧*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:✧*:✧✧･ﾟ:*✧･ﾟ:*✧･ﾟ:
*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:･ﾟ✧*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:･ﾟ✧*:･ﾟ*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:✧*:✧*:･ﾟ･ﾟ
Have An Amazingly Good Day!!
~Pinky~
How do ecosystems change overtime
Answer:
Ecosystems, the interactive system of living and nonliving organisms in a specific location, change slowly over time. When new plants and animals arrive in an area, they either thrive or struggle. Thriving species sometimes displace native species. When this happens, the system as a whole begins to change.
Please help im testing and need an answer as soon as possible
Kaya collects the data shown in the table.
A 2-column table with 3 rows. The first column labeled Quantity has entries Voltage, Current, Resistance. The second column labeled Value has entries 6.0 volts, 0.3 Amperes, empty.
What is the resistance in the circuit?
0.05
1.8
5.7
20
Answer:
20
Explanation:
not sure please correct me if im wrong
Answer:
20
Explanation:
Got it right on time 4 learning
How many grams of H2 are needed to completely react within 50g of N2?
Answer: 10.7 grams
Therefore, 10.7 grams of Hydrogen are necessary to fully react with 50.0 grams of Nitrogen.
2C2H6 + 8O2 = 4CO2 + 6H2O
My teacher wants to know how many moles are required, how many moles oaf carbon dioxide are produced and how many moles of water are produced. Can somebody please help me?
Answer:
4 moles of carbon
6 moles of water
Explanation:
I think as there no data given u have to is the numbers infront of the equation e.g 4CO2 so 4.
hope this helps :)
which process is a chemical change
what is the molarity of a solution prepared dissolving 317 g of CaCl2 into enough water to make 2.50 L of solution?
Answer:
1.14 M
Explanation:
Step 1: Calculate the moles corresponding to 317 g of calcium chloride (solute)
The molar mass of calcium chloride is 110.98 g/mol.
317 g CaCl₂ × 1 mol CaCl₂/110.98 g CaCl₂ = 2.86 mol CaCl₂
Step 2: Calculate the molarity of the solution
Molarity is equal to the moles of solute divided by the liters of solution.
M = moles of solute / liters of solution
M = 2.86 mol / 2.50 L = 1.14 mol/L = 1.14 M
An electric kettle uses electrical energy to boil water. Energy from the electricity is transferred to the water, heating it up. An electric ice maker also uses electrical energy, but it freezes water to form ice. Since energy can’t be created or destroyed, and water loses potential energy when it freezes to form ice, what happens to the energy put into the ice maker and the energy released by the water?
Answer:
Since energy can’t be created or destroyed, and water loses potential energy when it freezes to form ice. The energy remains electrical but then changes to kinetic when Enough energy is released.
Explanation:
Answer:
Explanation:
The overabundance of electrical energy acquired by water during the ice framing process is taken out as likely energy to keep up with the law of energy conservation. The electrical energy given to the ice generator pivots the engine inside the blower (compressor). The coolant available inside the blower is compressed and this pressure is accomplished alongside the creation of heat energy. The heat energy is delivered into the external encompassing air of the ice generator. This prompts a drop in the temperature of the coolant.
This coolant courses inside the ice generator and soaks heat energy (heat stream from the heater to the colder area) from the water as it gets once again to the blower, Thus prompting cooling of water and development of ice.
1) What experimental condition is required for the heat change in a reaction to be numerically equal to the enthalpy change (ΔH)?
2) When 1 mol of nitrogen gas reacts with 3 mol of hydrogen gas, 2 mol of ammonia gas is produced and 92.6 kJ of heat is released. Write the thermochemical equation.
Answer:
Answers are in the explanation
Explanation:
1) The constant pressure is necessary during a reaction. Thus, the heat released in the reaction will be = ΔH
2) The reaction described in the problem is:
1 N₂(g) + 3H₂(g) → 2NH₃(g)
The thermochemical equation involves the change in heat, as 92.6kJ are released, the heat must be wrote as another reactant, that is:
N₂(g) + 3H₂(g) → 2NH₃(g) + 92.6kJ2 H2(g) + O2 (g) --> 2 H20 (1)
How many moles of hydrogen gas do you need to make 2 moles of liquid water?
Answer:
4moles of hydrogen atoms
Explanation:
The second conversion factor reflects the number of atoms contained within each molecule. Two water molecules contain 4 hydrogen atoms and 2 oxygen atoms. A mole of water molecules contains 2 moles of hydrogen atoms and 1 mole of oxygen atoms.
PLESE HELP WILL GIVE BRAINLYESTY
Imagine that you are Andreas Vesalius. Write a short autobiographical statement that talks about who you are, where you’re from, and some of your important contributions.
Answer:
My name is Andreas Vesalius and I'm a 16th-century Flemish anatomist, physician, and author of one of the most influential books on human anatomy, De Humani Corporis Fabrica Libri Septem. I am often referred to as the founder of modern human anatomy. I was born in Brussels, December 31, 1514 which was then part of the Habsburg Netherlands. I was a Flemish doctor who was notable for my contribution to the science of anatomy of the human body. I was the first to perform public dissection on a human corpse, a practice that was unusual in the Middle Ages due to spiritual beliefs.
Explanation:
What is the percent by mass of carbon in carbon dioxide (CO2)?
A. 27%
B. 33%
C. 43%
D. 73%
Consider the following reaction:
4FeS2 + 11O2 → 2Fe2O3 + 8SO2
When 28.42 grams of FeS2 reacts with 5.44 grams of O2, how many grams of SO2 are formed?
What is the limiting reactant?
What is the excess reactant?
I'm begging
what does Element mean?
A.)The smallest part of matter still retaining chemical properties
B.)Consists of only protons and neutrons
C.)A pure substance, only one type of atom
D.)Two or more atoms held together by chemical bonds
Answer:
C is the answer I believe.
If an atom has 8 electrons and 8 protons and 9 neutrons then what is it's net charge?"
choices:
0
1+
1-
2-
How is ethanol DIFFERENT from gasoline?
A. Ethanol is alcohol; gasoline is fuel.
B. Ethanol becomes a bacteria; gasoline becomes a chemical.
C. Ethanol helps break down yeast; gasoline is a by-product of
yeast.
D. Ethanol is made from oranges; gasoline is made from
petroleum
what is the use of connective tissue
Answer:
Explanation:
Major functions of connective tissue include: 1) binding and supporting, 2) protecting, 3) insulating, 4) storing reserve fuel, and 5) transporting substances within the body. Connective tissues can have various levels of vascularity.
Answer:
Connective tissues can have various levels of vascularity.
Explanation:
Which of the following factors affects the amount of heat absorbed by a substance?
A. Boiling point of the substance
B. Specific heat capacity of the substance
C. Melting point of the substance
D. Shape of the substance
Answer:
The correct answer is B, "Specific heat capacity of the substance."
Explanation:
I just took the test. I hope this helps!
Heat absorbed changes the bonds of the molecules or the compounds to alter their state. The specific heat capacity affects the amount of heat absorbed. Thus, option B is correct.
What is specific heat capacity?Specific heat capacity is defined as the amount of heat or energy absorbed by the kilogram of the solid reactant when the system experiences a rise in temperature. It is measured in J/(kg K) or J/(kg °C).
The specific heat capacity, the mass of the substance, temperature, and the phase of the substance affects the absorption of the heat from the surrounding. The specific heat affects absorption as it tells about the substance's ability to take the heat energy.
Therefore, specific heat capacity affects heat absorption.
Learn more about specific heat capacity here:
https://brainly.com/question/2530523
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How is entropy related to the spontaneity of a reaction? AP3X
Answer:
S>0 contributes to spontaneity.
Explanation:
i just took the test on a pex :)
According to the law of thermodynamics, the relationship between entropy and the spontaneity of a reaction is S > 0.
What is entropy?Entropy is the total amount of energy in a closed system that is present there, but there are no uses for that energy. It is the unused energy for any work.
By the second law of thermodynamics, any spontaneous process results in an increase in the universe's overall entropy. The total of the entropy produced by the spontaneous process and the change in energy brought on by the heat flow is known as the net change in entropy of the system or S.
The reaction will be spontaneous if the delta G is negative. Delta G is the Gibbs free energy. So the entropy S will be greater that the reaction.
The Gibbs free energy equation is:
△G = △H − T△S
Thus, the relation is S > 0.
To learn more about entropy, refer to the link:
https://brainly.com/question/13386678
#SPJ2
A sub-shell with n = 6, l = 2 can accommodate a maximum of:
Answer:
72
Explanation:
2n^2
n=6
2(6)^2=2×36
=72
Two samples of hot unknown metals of equal temperatures are dropped in separate containers of water at 30 degrees Celsius. The final temperature of sample A is 33.5 degrees, and the final temperature of sample B is 31.8 degrees. Which metal sample had the highest specific heat?
Answer:
Sample B has the highest specific heat
Explanation:
Specific heat of a material is defined as the heat necessary to increase in the temperature of 1g of material in 1°C.
The material with the highest specific heat requires more energy to increase its temperature.
In the problem, sample A and B are under the same amount of energy but sample A increases more its temperature. That means sample A has the lowest specific heat and:
Sample B has the highest specific heat12. A. 2 g of ferrous sulphate crystals 5 points
are heated in a dry boiling tube. a)
Name and define the type of reaction
that has taken place. b) Write
balanced chemical equation for the
above reaction. c) List two main
observations of this reaction. B. A
shining metal 'M'on burning gives a
dazzling white flame and changes to
a white powder ‘N’. a) Identify ‘M'and
'N'. b) Name the type of reaction
taking place and write the balanced
chemical equation.
Answer:
A) Decomposition reaction.
Decomposition reaction is defined as a chemical reaction whereby a compound is broken down into 2 or more simpler substances.
B) 2FeSO4 + Heat > Fe2O3 + SO2 + SO3
C) - Gas evolution because a gas is part of the product
- Upon heating its colour gradually changes from pale green to reddish brown which implies a change in state
Explanation:
A) Name of the reaction is; Decomposition reaction.
Decomposition reaction is defined as a chemical reaction whereby a compound is broken down into 2 or more simpler substances.
B) The balanced chemical equation is;
2FeSO4 + Heat > Fe2O3 + SO2 + SO3
C) From experience, the 2 main observations of this reaction are;
- Gas evolution because a gas is part of the product
- Upon heating its colour gradually changes from pale green to reddish brown which implies a change in state.
_Ch7H16+_O2=_CO2+_H2O balancing the equation
Answer:
0,11,7,8
Explanation: hope this helps!
Which of the following has the most energy?
heat
ultraviolet rays
the color blue
radio waves
Answer:
C
Explanation:
How many protons, neutrons, and electrons are found in a neutral atom of hydrogen-333?
Answer:
Explanation:
A hydrogen atom has an atomic number of 1.
So it's proton number will always be 1.
A neutral hydrogen atom does not have any charge.
So it has the same amount of electrons as protons, which turns out to be also 1.
A neutral hydrogen atom has an atomic mass of ≈
1.00794 amu ≈ 1 amu.
To find the amount of neutrons, we take the proton number and subtract it from the mass number.
1 − 1 = 0
So a neutral hydrogen atom has no neutrons.
In summary,
A hydrogen atom has
1 proton
1 electron
0 neutrons
I hope that helps!