Answer:
The final temperature is 22.2°C
Explanation:
Step 1:
Data obtained from the question. This includes the following:
Mass (M) = 25g
Heat (Q) = 2913 J
Initial temperature (T1) = 50.0°C
Final temperature (T2) =?
Specific heat capacity (C) = 4.184J/g°C
Step 2:
Determination of the final temperature.
The final temperature can be obtained as follow:
Q = MC(T1 – T2).. Since we are cooling
2913 = 25 x 4.184 (50 – T2)
2913 = 104.6 (50 – T2)
Divide both side by 104.6
50 – T2 = 2913/104.6
50 – T2 = 27.8
Collect like terms
T2 = 50 – 27.8
T2 = 22.2°C
The final temperature is 22.2°C
If only one molecule of sulfurous acid was involved in a chemical reaction, how many sulfur atoms would be in the products?
Answer:
1 atom sulfur
Explanation:
1 molecule sulforous acid = SO2 Thus, 1 atom sulfur and 2 atoms O
Convert 2.70
atm
to
torr
Answer:
2052
Explanation:
multiply the pressure value by 760
To convert atm to torr, we should know 1 atm equals 760 torrs then the conversion exists 2052 torr.
What is meant by pressure conversion?
Torr and atm are the two main pressure units. To convert atm to torr, we should know 1 atm equals 760 torrs.
It exists the manometric pressure unit. It exists described as, the pressure exerted by column of mercury one millimeter high it exists represented by mmHg.
Torr to mmHg conversion:
Both exists equivalent to each other.
1 torr = 1 mmHg
Torr to atm:
Torr exists converted into atm by dividing the torr value 760.
mmHg to atm.
mmHg exists converted into atm by dividing the torr value 760.
Kilopascal:
The kilopascal exists the unit of pressure. It exists denoted by KPa.
Given:
2.70 atm
The conversion exists given by,
1 atm = 760 torr
2.70 atm = 760 × 2.70 torr
= 2052 torr
Therefore, the correct answer is 2052 torr.
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Periodic law states that when the elements are arranged according to their atomic numbers, this allows elements with similar properties to appear at regular intervals. Predict the group of elements and their number of valance electrons that will combine in a 3:2 ratio to with calcium
Answer:
is a mutiply choice answer just to be specific
Explanation:
Final answer:
Elements from the chalcogen group (group 16), which have six valence electrons, will combine with calcium in a 3:2 ratio to form a compound, such as calcium oxide ([tex]Ca_3O_2[/tex]).
Explanation:
The question asks which group of elements and how many valence electrons they have that would combine in a 3:2 ratio with calcium to form a compound. Calcium is an alkaline earth metal and has two valence electrons. It is located in group 2 of the periodic table. For elements to combine with calcium in a 3:2 ratio, we need to look for elements that will combine in such a way that three atoms of that element will bond with two atoms of calcium. This typically occurs with nonmetals from the chalcogen group (group 16), which have six valence electrons each.
For example, if we consider oxygen (O), which is a member of the chalcogen group, it can be seen that two calcium atoms (each providing two valence electrons for a total of four electrons) will combine with three oxygen atoms (each needing two electrons to complete its valence shell) to form calcium oxide ([tex]Ca_3O_2[/tex]) in a 3:2 ratio, utilizing all valence electrons involved in the bond formation.
A container has 21.5L of helium gas at a pressure of 245 kPa and a temperature
of 315K. How many moles of helium are in the container?
Answer:
There are 2, 01 moles of helium in the container
Explanation:
We use the formula PV=nRT. We convert of pressure the unit kPa into atm:
101,325 kPa---1 atm
245 kPa ----x= (245 kPa x 1 atm)/101,325 kPa=2,42 atm
PV= nRT ---> n=PV/RT
n= 2, 42 atm x 21, 5 L/ 0,082 l atm /K mol x315K
n=2, 012620871 mol
A candle is placed on one pan of a balance, and an equal weight is placed on the other
pan. What would happen if you lit up the candle and waited for a while?
Lighting the candle on a double-pan mechanical balance will cause the balance to tilt as the candle loses mass due to combustion, favoring the side with the unburned weights.
When a candle placed on one pan of a double-pan mechanical balance is lit, and an equal weight is on the other pan, the balance will be disrupted over time. As the candle burns, it loses mass primarily through the combustion process, which converts wax into gases like carbon dioxide and water vapor that are released into the air. As a result, the mass in the candle's pan decreases, causing the balance to tilt favoring the side with the unburned weights, typically metal cylinders of standard mass.
Which force help keep Earth in orbit
Answer:
the answer the gravity
Explanation:
balancing this equation
2 C2H2 + O2 CO2 + H2O
Final answer:
Balancing the provided chemical equation for the combustion of ethane results in a balanced equation with integer-only coefficients: 2 C2H6 + 7 O2 → 4 CO2 + 6 H2O, showcasing the adherence to the law of conservation of mass.
Explanation:
The question involves balancing a chemical equation which is a fundamental skill in chemistry. The correct and balanced equation for the combustion of ethane (C2H6) in oxygen is as follows:
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
This equation demonstrates that when ethane (C2H6) combusts with oxygen (O2), it produces carbon dioxide (CO2) and water (H2O). Balancing a chemical equation ensures that there are an equal number of atoms for each element on both sides of the equation, adhering to the law of conservation of mass. This equation is balanced by ensuring there are equal numbers of carbon, hydrogen, and oxygen atoms on both reactant and product sides. After initial attempts that might lead to fractional coefficients, multiplying all coefficients by an appropriate factor to achieve integer-only coefficients is a commonly used strategy as illustrated by the multiplication of each coefficient by 2 in this case.
Megan prepares a pitcher of lemonade by adding a quarter cup of granular sugar to the mixture. Which action should she take so the sugar dissolves in the lemonade faster?
A) Increase the amount of sugar.
B) Add a small amount of powdered sugar.
C) Stir the water continuously.
D) Cool the pitcher.
E) Reduce the original quantity of water.
ANSWER: C - Stir the water continuously ;)
Answer:
C. Stir the water continuously
Explanation:
stirring allows the solvent to continuously stick to the solvant
Using the information in the table to the right
calculate the enthalpy of combustion of each of
the following substances:
acetylene:
KJ/mol
Compound
methane (CHA)
acetylene (C2H2)
ethanol (C2H5O)
carbon dioxide (CO2)
water (H20)
AH, (kJ/mol)
-748
228.77
-235.1
-3935
-241.82
ethanol:
KJ/mol
DONE
Answer: Acetylene : -1,256 kJ/mol
Ethanol : -1,277 kJ/mol
Explanation:
The enthalpy of combustion of acetylene is -1299 kJ/mol and the enthalpy of combustion of ethanol is -1367 kJ/mol.
How to calculate the enthalpy of combustion?To calculate the enthalpy of combustion of each substance, we need to use the equation:
ΔHcombustion = ΣΔHf(products) - ΣΔHf(reactants)
Where ΔHcombustion is the enthalpy of combustion, ΣΔHf(products) is the sum of the enthalpies of formation of the products, and ΣΔHf(reactants) is the sum of the enthalpies of formation of the reactants.
Using the enthalpies of formation (AH) given in the table, we can calculate the enthalpy of combustion of each substance:
Acetylene:
C₂H₂ + (5/2)O₂ → 2CO₂ + H₂O
ΔHcombustion = [2(-393.5) + (-241.8)] - [228.8] = -1299 kJ/mol
Ethanol:
C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O
ΔHcombustion = [2(-393.5) + 3(-241.8)] - [-235.1] = -1367 kJ/mol
Therefore, the enthalpy of combustion of acetylene is -1299 kJ/mol and the enthalpy of combustion of ethanol is -1367 kJ/mol.
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What determines the size of an ocean wave?
a. the wave's color
b. the wave's temperature
c. the wave's speed
d. the wave's energy
Question 1 (1 point)
HOW MANY moles of Neon would be contained in 4.0 L of neon gas at 560 kPa and 127 C?
Answer:
0.674 mol
Explanation:
Step 1:
Data obtained from the question.
Volume (V) = 4 L
Pressure (P) = 560 kPa
Temperature (T) = 127°C
Number of mole (n) =?
Step 2:
Conversion to appropriate unit.
For pressure:
101.325 KPa = 1 atm
Therefore, 560 kPa = 560/101.325 = 5.53 atm
For temperature:
Temperature (Kelvin) = temperature (celsius) + 273
temperature (celsius) = 127°C
Temperature (Kelvin) = 127°C + 273 = 400K
Step 3:
Determination of the number of mole of Neon.
The number of mole of Neon can be obtained by using the ideal gas equation as follow:
Volume (V) = 4 L
Pressure (P) = 5.53 atm
Temperature (T) = 400K
Gas constant (R) = 0.082atm.L/Kmol
Number of mole (n) =?
PV = nRT
5.53 x 4 = n x 0.082 x 400
Divide both side by 0.082 x 400
n = (5.53 x 4) /(0.082 x 400)
n = 0.674 mol
The number of mole of Neon is 0.674 mol
To find the number of moles of Neon in 4.0 L of neon gas at 560 kPa and 127 °C, the ideal gas law is used, and approximately 0.674 moles of Neon are found.
The student has asked how many moles of Neon would be contained in 4.0 L of neon gas at 560 kPa and 127 °C. To answer this question, we will use the ideal gas law, which can be stated as PV = nRT where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature in Kelvin.
First, convert the temperature from Celsius to Kelvin:
T(K) = 127 °C + 273.15 = 400.15 KConvert pressure from kPa to atm:
P(atm) = 560 kPa / 101.325 kPa/atm = 5.528 atmThe ideal gas constant, R, is 0.0821 L·atm/mol·K.
Now, rearrange the ideal gas equation to solve for n (moles):
n = PV / (RT)Plugging the values in, we get:
n = (5.528 atm × 4.0 L) / (0.0821 L·atm/mol·K × 400.15 K)n ≈ 0.672 moles of NeonTherefore, there are approximately 0.674 moles of Neon in 4.0 L of neon gas under the given conditions.
How much heat energy is added to 29.0 g of copper when the temperature changes by 25 degrees
Answer:
The correct answer is 3.0 * 10^3 J.
Explanation:
To solve this problem, we must use the formula q = mcΔT, where q represents the heat energy measured in joules, m represents the mass measured in grams, c represents the specific heat measured in J/°C*g, and ΔT represents the change in temperature, measured in °C.
To solve this problem, we must first plug the given values into the equation.
q = mcΔT
q = (29.0 g)(4.184 J/°C*g)(25 °C)
Now, we must multiply the values together to get our final answer.
q = 3033.4 J
But, we must remember the rules of significant figures, which tell us that since the temperature only had 2 significant figures, the answer must have 2 significant figures as well.
Therefore, the answer is:
q = 3.0 * 10^3 J
Hope this helps!
20 pts :p will mark brainliest too.
I = Increase.
D = Decrease.
With the grass it'll decrease because more rabbits means more grass being eaten. With the animals the more rabbits there are the more food there is for them which means they more they can feed children and keep repopulating. And halving the rabbit population would be opposite I'd assume.
How many liters are in 555 g of O2
Answer:
388.5
Explanation:
[tex] \frac{555}{32} = 17.34375 \\ 17.34375 \times 22.4 = 388.5 [/tex]
How many atoms of hydrogen in the product side of the balanced equation?
Fe + H20 ---> FeO + H2
A. 2
B. 3
C. 6
Answer:
A
Explanation
The product side is on the right, FeO + H2. H represents hydrogen, the number after it is the sbscript, which indicates that there are two hydrogen atoms.
There are two atoms of hydrogen in the product side of the balanced chemical equation.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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- Which theory was the natural beginning of a Big Bang theory?
Well, the big bang theory was that the universe started to expand at and extrmly fast rate. We're talking several billion kilometers in less than a second. People think that our univers was pretty much shot out into space in a ciertain direction. During this, the univers has expanded and widen't to unimaginable size. but we really don't know what happend, and we may never find out. Who knows?
According to the traditional Big Bang theory, the universe's creation involved a singularity, a region of infinite density and temperature whose nature is difficult for humans to comprehend.
What is big bang theory ?A physics theory called the Big Bang event explains how the cosmos grew from a highly dense and hot starting condition. The evolution of the observable universe from the earliest known times through its succeeding large-scale form is explained by several cosmological models of the Big Bang.
Everything in the cosmos was compressed into a singularity, a point of infinite heat and density, around 13.7 billion years ago. Our cosmos suddenly began to expand explosively, expanding faster than the speed of light.
Belgian Catholic priest, theoretical physicist, mathematician, astronomer, and professor of physics Georges Lemaître is credited with developing the theory itself. The notion was initially supported by Hubble's Law of the universe's expansion.
Thus, in the traditional Big Bang theory, the universe's creation involved a singularity.
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An enthusiastic car owner checks his tire pressure religiously and makes note that his tire pressure is 220 kPa in 80 degrees Fahrenheit (26.7 degrees Celsius). A strong cold front comes in and later in the week the temperature has dropped to 36 degrees Fahrenheit (2.2 degrees celsius). How can the car owner use gas laws to calculate the new tire pressure (in kPA units)?
Answer:
202 KPa
Explanation:
Step 1:
Data obtained from the question.
Initial Pressure (P1) = 220 kPa
Initial temperature (T1) = 26.7°C
Final temperature (T2) = 2.2°C
Final pressure (P2) =?
Step 2:
Conversion of the Celsius temperature to Kelvin temperature.
Temperature (Kelvin) = temperature (celsius) + 273
T1 = 26.7°C + 273 = 299.7 K
T2 = 2.2°C = 2.2°C + 273 = 275.2 K
Step 3:
Determination of the new pressure.
The new pressure of the tire can be obtained as follow:
P1/T1 = P2/T2
220/299.7 = P2/275.2
Cross multiply to express in linear form
299.7 x P2 = 220 x 275.2
Divide both side by 299.7
P2 = (220 x 275.2)/299.7
P2 = 202 KPa
Therefore, the new pressure of the tire is 202 KPa
When the temperature drops to 2.2 degrees Celsius, the tire pressure will decrease to approximately 202.1 kPa.
We can use the combined gas law which is derived from the ideal gas law. The combined gas law relates pressure, volume, and temperature without needing to know the quantity of gas, and is expressed as (P₁/T₁) = (P₂/T₂), where P₁ and T₁ are the initial pressure and temperature, and P₂ and T₂ are the final pressure and temperature.
To do so, we first convert temperatures to Kelvin by adding 273.15. Then we rearrange the formula to solve for P₂:
P₂ = P₁ x (T₂/T₁)P₂ = 220 kPa x (275.35 K / 299.85 K)P₂ = 202.1 kPaTherefore, the tire pressure will decrease to approximately 202.1 kPa.
Find the number of moles of argon in 452 g of argon.
Answer: 13.31 moles.
Explanation: So take 452 grams of Argon and multiply by the molar mass of Argon. Your units will cancel out, leaving you with moles of Argon.
where do the words go? please help me ASAP!!!
Answer:
ye
Explanation:
help
A doctor prescribes 1,000 mg of glucosamine (C6H13NO5) per day for a person with osteoarthritis.
How many moles of glucosamine does the patient take each day?
5.60
0.10
5.59×10−3
1.00×10−3
To determine the number of moles of glucosamine in a 1,000 mg dose, first calculate the molar mass of glucosamine (C6H13NO5), which is approximately 179.17 g/mol. Then convert the dose to grams (1,000 mg equals 1 g) and divide by the molar mass to find that the patient takes 0.00559 moles of glucosamine per day.
Explanation:To calculate how many moles of glucosamine a patient takes each day when prescribed 1,000 mg of glucosamine, we need to first determine the molar mass of glucosamine. Glucosamine has a chemical formula of C6H13NO5, so we will sum the atomic masses of its constituent elements: Carbon (C), Hydrogen (H), Nitrogen (N), and Oxygen (O). The molar mass of one mole of glucosamine can be found by adding the molar masses of 6 carbons (≈13.01 g/mol), 13 hydrogens (≈1.01 g/mol), one nitrogen (≈14.01 g/mol), and five oxygens (≈16.00 g/mol), which equals approximately 179.17 g/mol. Next, we convert the prescribed dose from milligrams to grams: 1,000 mg = 1 g. Lastly, we divide the mass of glucosamine in grams by its molar mass in grams per mole to calculate the number of moles.
1 g / 179.17 g/mol = 0.00559 moles (or 5.59×10⁻³ moles), which is the amount of glucosamine the patient takes each day.
Can someone please answer at least a few or something.I struggling out here since I’m dumb
Answer:
3. Group
5. Valence electron
6. The atomic number tells you the presence of proton and electron.
Explanation:
The electrons which are present in the last shell or orbit is called valence electron and the shell is valance shell. When you go from left to the right side of the periodic table, number of shells remains the same but number of electron increases while when we go from top to bottom of periodic table, number of shell increases but the number of valance electrons remains the same.
2. An 18.0 liter container holds 1.20 moles of oxygen gas at 45.0 degrees Celsius. What is the
pressure in the container? *
Answer:
The pressure in the container is 1,7 atm.
Explanation:
We convert the unit of temperature in Celsius into Kelvin:
0°C= 273K --> 45°C= 45 + 273= 318 K
We use the formula:
PV=nRT ---> P =nRT/V
P= 1,20 mol x 0,082 l atm/K mol x 318 K/18,0 L
P= 1, 7384 atm
Calculate the molarity of Na+ ions in a 100 ml solution containing 0.46 g Na3PO4
Answer:
0.084 M
Explanation:
molar mass of Na3PO4 = 3*23 + 31 + 4*16 = 164 g/mol
moles of Na3PO4 = mass / molar mass = 0.46/164 = 0.0028 mol
There are 3 moles of Na+ in 1 mol of Na3PO4, so there are 3*0.0028 = 0.0084 moles of Na+ in the solution
Molarity is defined as:
M = moles of solute/litre of solution
100 ml are equivalent to 0.1 L
Therefore:
M of Na+ = 0.0084/0.1 = 0.084 M
Why does a noise sound fainter as you move away from its source?
Answer:
Uhh..Because as you get farther away then you cant hear the sound waves i think
Explanation:
Answer:
because the sound waves can only travel so far and if there is things near the source the waves bounce off of it. Ex: the speaker in the class room wouldn't be quiet, its like the noise went away as i walked down the halls, maybe the walls were blocking the noise
Explanation:
Help ASAP! WILL MARK BRAINLIEST!
What must happen for light to change a material?
Answer:
There should be the refraction for light to change a material.
Answer: change in speed
Explanation: the change in speed causes light Ray's to change direction. This directional change is called refraction.
What is the chemical name for the compound If5
Answer:
Iodine pentafluoride
Explanation:
Answer:
Iodine pentafluoride
what is the part of an atom that is mostly empty space is the
Answer:atom
Explanation: electron cloud
Which equation represents a fission reaction?
Superscript 14 subscript 7 upper N plus superscript 1 subscript 1 upper H right arrow superscript 15 subscript 8 upper O.
Superscript 235 subscript 92 upper U plus superscript 1 subscript 0 n right arrow superscript 140 subscript 55 upper C s plus superscript 94 subscript 37 upper R b plus 2 superscript 1 subscript 0 n.
Superscript 9 subscript 4 upper B e plus superscript 4 subscript 2 upper H e right arrow superscript 12 subscript 6 upper C plus superscript 1 subscript 0 n.
Superscript 239 subscript 93 upper N p right arrow superscript 239 subscript 94 upper P u plus superscript 0 subscript negative 1 e.
Answer:
B
Explanation:
on edge
The second equation represents a fission reaction because a large atom splits into many smaller atoms along with energy.
What is nuclear fission reaction?Fission reaction occurs when a larger atom split into two smaller atoms with the release of a tremendous amount of energy.
So we can conclude that the second equation represents a fission reaction because a large atom splits into many smaller atoms along with energy.
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If the Dry bulb reads 25 degrees Celsius and the wet bulb reads 22
degrees Celsius. Is the relative humidity high or low? How do you know?
Answer:
Relative humidity is low .
Explanation:
The wet bulb reads low temperature because due to low humidity of atmosphere , evaporation of water takes place from the wet bulb which makes the bulb cool and therefore it reads lower temperature . In the process of evaporation , heat equal to latent heat of vaporization is taken from the bulb and it loses temperature.
Calculate the molarity of a solution prepared by dissolving 6.80 grams of AgNO3 in 2.50 liters of solution.
SHOW WORK:)
Answer:
0.016M
Explanation:
First we find the mole of AgNO3 by using the formula mass/molar mass..
Then we find molarity by the formula mole/volume...
I hope you get this..