Answer:
27 days, 7 hours and 43 minutes.
Explanation:
To complete a full orbit around Earth, it takes 27 days, 7 hours and 43 minutes for the Moon. This is called sidereal month and is measured by the Moon's position relative to distant *fixed" stars.
In the acetylene torch, acetylene gas (C2H2)(C2H2) burns in oxygen to produce carbon dioxide, water, and energy: 2C2H2(g)+5O2(g)⟶Δ4CO2(g)+2H2O(g)2C2H2(g)+5O2(g)⟶Δ4CO2(g)+2H2O(g) You may want to reference (Pages 241 - 243) Section 7.7 while completing this problem. Part A How many moles of O2O2 are needed to react with 1.85 molmol of C2H2C2H2? Express your answer to three significant figures and include the appropriate units. nn(O2O2) = nothingnothing SubmitRequest Answer
Answer:
4.63 mol
Explanation:
Step 1: Write the balanced complete combustion reaction of acetylene
2 C₂H₂(g) + 5 O₂(g) ⟶ 4 CO₂(g) + 2 H₂O(g)
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of C₂H₂ to O₂ is 2:5.
Step 3: Calculate the number of moles of O₂ needed to react with 1.85 moles of C₂H₂
We will use the stoichiometric molar ratio.
1.85 mol C₂H₂ × (5 mol O₂/2 mol C₂H₂) = 4.63 mol O₂
I use a psychrometer to measure the relative humidity on a starry
summer night. My dry-bulb temperature is 18 degrees Celsius, and my
wet-bulb temperature is 19 degrees Celsius. What is the relative
humidity, in %?
The relative humidity on a starry summer night is determined as 91%.
Dry bulb depression temperature
The dry bulb depression temperature is calculated as follows;
ΔT = 19⁰C - 18⁰C = 1⁰C
at dry bulb temperature of 18⁰C and depression temperature of 1⁰C, the relative humidity is determined as 91%.
Thus, the relative humidity on a starry summer night is determined as 91%.
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just write a C.E.R (claim, evidence, reasoning)
Answer:
I have attached pictures below. Maybe those will help?
Explanation:
Answer:
this is a CER model i did for science
Explanation:
claim : Tissue engineering is good for the future and has a positive impact on the future because tissue engineering restores aged, damaged or lost tissues/organs with artificial tissues in a way past medicines or technology has not.
evidence: The infographic states, “This science field provides opportunities for helping many people replace dead or injured organs with new ones. In doing so, it will give them a healthier, more productive life. This field is just beginning, and it is sure to change the length and quality of life of many people in the future.“
reasoning: Many people can benefit from tissue engineering because they can have dead or injured organs replaced with new ones. Tissue engineering is just the beginning and is still being conducted and tested , but as technology gets more advanced and advanced, tissue engineering will improve peoples lives the way medicines and past technology has never done.
Now, let's solve our problem using Boyle's Law:
A gas that exerts a pressure of 151 mm Hg in a
container with a volume of
L will exert a
pressure of 166 mm Hg when transferred to a
container with a volume of 0.532 L.
[?]L
Assume that the number of moles and the
temperature remain constant.
Answer:
V₁ = 0.585 L
Explanation:
Given data:
Initial pressure = 151 mmHg
Initial volume = ?
Final pressure = 166 mmHg
Final volume = 0.532 L
Solution:
The given problem will be solved through the Boyle's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
151 mmHg × V₁ = 166 mmHg × 0.532 L
V₁ = 166 mmHg × 0.532 L / 151 mmHg
V₁ = 88.312mmHg .L /151 mmHg
V₁ = 0.585 L
Name one way that the scientific community has honored Mendeleev’s contribution to science.
Answer:
Mendeleev's greatest contribution to science is certainly the Periodic Table of Elements, which says the properties of basic elements repeat periodically when they are arranged by their atomic number. He made the discovery in 1869 during his work on the award-winning textbook on chemistry basics.
Inventions: Periodic table, Pyrocollodion
Explanation:
*Hope this helps*
Answer:
Mendeleev's greatest contribution to science is certainly the Periodic Table of Elements, which says the properties of basic elements repeat periodically when they are arranged by their atomic number. He made the discovery in 1869 during his work on the award-winning textbook on chemistry basics.
Inventions: Periodic table, Pyrocollodion
Explanation:
Mass of an empty 50 litres cylinder is 4.8kg. the cylinder is filled with 60atm nitrogen gas. molecular mass of nitrogen is 28. what is the new mass of cylinder
Answer:
8.235 kg
Explanation:
Mass of the cylinder = 4.8 kg
The capacity (volume) of the cylinder = 50 liters
As 1 m^3 = 1000 liters
So, the volume of the cylinder, v= 0.05 m^3
The volume of filled nitrogen, v= 0.05 m^3
Pressure of filled nitrogen, p = 60 atm = 60\times 101325 Pa
Assuming that the nitrogen gas is at room temperature which is 25-degree centigrade,
So, the temperature of nitrogen gas, T=273+25= 298 K
By using the ideal gas equation, pv=nRT
Where n is the number of moles, R is the universal gas constant, R = 8.314 J/mol·K
Putting all the values in the ideal gas equation, we have
(60 x 101325)0.05 = n (8.314) x (298)
n= (60 x 101325 x 0.05)/(8.314 x 298)
n=122.69 moles
As the molar mass of nitrogen is 28, so the total mass of the nitrogen in the cylinder, m= 122.69 x 28 = 3435.32 grams = 3.435 kg.
Hence, the new mass of the cylinder = 4.8+3.435=8.235 kg
The table shows four reactions.
Reactions
Reaction Equation
C₃ H8+ 50₂ 3C02 + 4H20
2Ca + O2- 2CaO
AgNO3 + NaCl
AGCI + NaNO3
CH3COOH + 202 - 2CO2 + 2H20
4
Which of the above reactions is an example of combustion of an Inorganic substance? (5 points)
Answer: 2
Explanation:
A combustion reaction must include O2 as a reactant.
An inorganic substance almost never includes carbon.
So, by process of elimination:
1. Carbon is a reactant = probably not
2. Has O2, no carbon = yes
3. O2 is not a reactant = no
4. Carbon is a reactant = probably not
An example of the combustion of an inorganic substance is:
2 Ca + O₂ ⇒ 2 CaO
We have 4 reactions and we want to determine which is an example of combustion of an inorganic substance.
What is combustion?A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat.
What is the difference between organic and inorganic substances?Organic substances always contain carbon while most inorganic substances do not contain carbon.
Let's consider the following reactions.
C₃H₈ + 5 O₂ ⇒ 3 CO₂ + 4 H₂OThis is a combustion reaction but C₃H₈ is an organic substance.
2 Ca + O₂ ⇒ 2 CaO
This is an example of the combustion of an inorganic substance.
AgNO₃ + NaCl ⇒ AgCI + NaNO₃
This is not a combustion reaction.
CH₃COOH + 2 O₂ ⇒ 2 CO₂ + 2 H₂O
This is a combustion reaction but CH₃COOH is an organic substance.
An example of the combustion of an inorganic substance is:
2 Ca + O₂ ⇒ 2 CaO
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HELPPP PLEASEEE
is this
1: radiation
2: conduction
3: convection
This is an example of #2, conduction.
Conduction is the process where heat energy is transmitted through collisions between atoms or molecules.
Which event would most likely lead to a thunderstorm g i v i n g b r a i n l e s i t HELP
Answer:
A
Explanation:
A is the correct answer once the warm, moist air moves into the cold, dry air, the thunderstorm will start to develop and gradually get larger.
punnet squares, help how do I do this
Explanation:
Im not sure what the other trait is so I couldn't do phenotype. I hope this still helps though
A piece of iron has a density of 7.87 grams per milliliters. It has a mass of 78.7 grams. What is the volume of the piece of iron?
How many hydrogen ions (H+) are in a mole?
butane
methane
ethane
propane
Given
the structure of the alkanes
Required
match the image to the name
Solution
Alkanes are saturated hydrocarbons with all of the carbon bonds being single bonds
General formula:
[tex]\large {\boxed {\bold {C_nH_2n + 2}}}[/tex]
If we look at the picture, we define the black atom as Carbon and the branch is Hydrogen
To determine the name of the alkane, all we have to do is count the number of Carbon atoms
Butane : C₄H₁₀ : 4 C atoms
Methane : CH₄ : 1 C atom
Ethane : C₂H₆ : 2 C atoms
Propane : C₃H₈ : 3 C atoms
Bruh I hate science Pls help me
List 5 physical properties of matter.
What is a chemical property?
List 2 chemical properties.
What is the difference between chemical property and chemical change?
List 3 products that are the results of chemical reactions.
Answer:
1. The properties of matter include any traits that can be measured, such as an object's density, color, mass, volume, length, malleability, melting point, hardness, odor, temperature, and more.
2. A chemical property is a characteristic of a particular substance that can be observed in a chemical reaction.
3. Toxicity and acidity.
4. A chemical property describes the ability of a substance to undergo a specific chemical change. A chemical reaction is a process that occurs when one or more substances are changed into one or more new substances.
5. The five basic types of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion. Analyzing the reactants and products of a given reaction will allow you to place it into one of these categories. Some reactions will fit into more than one category.
Hope this helps you~
Because of gravity, your weight
on the Moon
A. would be the same as it is on Earth
B. would be less than your weight on Earth
C. would be more than your weight on Earth
D. and your mass would be less than it is on Earth
Answer:
the answer is b
Explanation:
brcause the gravutational pull on the moon is lower than on earth...
Look at the following chemical equation.
10Ag + S = 8Ag S
What is true about this chemical equation? (Hint: The reactant is the substance at the start of a chemical reaction.
The product is the substance at the end of the chemical reaction.
A.It is unbalanced because the number of reactants is less than the number of products.
IB.t is balanced because the products contain the same number of sulfur (S) atoms as the reactants.
C.It is balanced because the mass of the reactants is equal to the mass of the products.
D.It is unbalanced because the products contain fewer silver (Ag) atoms than the reactants.
Answer: I think it is D
Explanation:
Help! Can someone please explain and break down the answers to both? I’m so confused!
1) The moles of H2O that f am be obtained from 15.0mL of 0.250 M HCl
2) the volume of 0.150 M KMnO4 needed to replaced 1.85 mol MnCl2
Please Help!
Your car has 1.95 gallons of gasoline (octane, d = 0.6916 g/mL), which reacts with oxygen
according to the balanced reaction below. Your car uses the energy produced by this reaction
at a rate of 115 kJ per second while traveling at a speed of 65 miles per hour. Calculate the
distance (in miles) the car can travel using this amount of octane.
2 C8H18(g) + 25 O2(g) -----> 16 CO2(g) + 18 H2O(g) ΔHrxn = -10,900 kJ
Answer:
38.3 miles
Explanation:
First, we convert 1.95 gallons to mililiters:
1.95 gallons * [tex]\frac{3.785 L}{1gallon}*\frac{1000mL}{1 L}[/tex]= 7380.75 mLThen we calculate how many grams of octane are available for the reaction, using its density:
0.6916 g/mL * 7380.75 mL = 5104.53 g C₈H₁₈Now we convert octane grams into octane moles, using its molar mass:
5104.53 g C₈H₁₈ ÷ 114 g/mol = 44.78 mol C₈H₁₈Then we calculate how many kJ are produced from the combustion of 44.78 mol C₈H₁₈, if 2 moles produce 10900 kJ:
44.78 mol * 10900 kJ / 2 mol = 244032 kJWe calculate how many seconds is the car available to keep going, if it spends 115 kJ per second:
244032 kJ * 1 s / 115 kJ = 2122.02 sWe convert seconds to hours:
2122.02 / 3600 = 0.59 hoursFinally we calculate the distance:
65 mi/hour * 0.59 hour = 38.3 miexhibits the highest intermolecular
forces of the states of matter.
Answer:
Solid
Explanation:
In solid there are strong intermolecular forces present as compared to liquid and gas. This is why solid are in more packed form as compared to liquid and gas. In liquid and gas intermolecular forces are week that's why molecules are away from each other and occupy more space.
Properties of gases:
Molecule of gases randomly move everywhere and occupy all available space.
Gases don't have definite volume and shape and take the shape and volume of container in which it present.
Their densities are very low as compared to the liquid and solids.
Gas molecules are at long distance from each other therefore by applying pressure gases can be compressed.
The very weak inter molecular forces are present between gas molecules.
Properties of Liquid:
Liquid have definite volume but don't have definite shape.
Their densities are high as compared to the gases but low as compared to the solids.
In liquid, molecules are close to each other and have greater inter molecular forces as compared to the gas molecules.
Properties of solids:
Solids have definite volume and shape.
In solids molecules are tightly pack and very close to each other.
Their melting and boiling point are every high.
The densities of solids are also very high as compared to the liquid and gas.
There are very strong inter molecular forces are present between solid molecules.
Answer:
A: Solid
Explanation:
Correct with Acellus
What else is produced when sodium carbonate decomposes?
Na2Co3 - Na2O+
Answer:When a single compound breaks down into two or more compounds or elements in a chemical reaction then it is known as decomposition reaction.
The chemical symbol for sodium carbonate is .
The decomposition of sodium carbonate is:
The decomposition of sodium bicarbonate, will result in the formation of sodium oxide, and carbon dioxide, .
Hence, carbon dioxide, will produce with sodium oxide, on decomposition of .
Explanation:Na2CO3 Na2O +CO2 CO2 is the answer
Which of these sentences probably comes from a work of classic literature?) PLEASE HELP ILL GIVE YOU BRAINLEIST!
A. The greedy man was harsh as winter, and had never done a generous deed in his long life; he was a hermit.
B. The man who refused to share with those in need had never felt the warmth that comes from giving.
C. The most selfish man in town was one who lived alone and never had visitors of any sort, except maybe lawyers.
D. The miser was hard and sharp as flint, from which no steel had ever struck out generous fire; he was as solitary as an oyster.
The sentences that probably comes from a work of classic literature are:
The most selfish man in town was one who lived alone and never had visitors of any sort, except maybe lawyers. The miser was hard and sharp as flint, from which no steel had ever struck out generous fire; he was as solitary as an oyster.What types of books are regarded as classics?The great literary works of Greek, Roman, and other prehistoric civilizations are referred to as classical literature. Classical literature includes the writings of Homer, Ovid, and Sophocles. The phrase isn't just applicable to books. It can also incorporate other types of writing, such as epic, lyric, tragedy, comedy, and pastoral.
Classical literature enables us to take a profound plunge into the lives, worldviews, and mindsets of individuals we have never met, to travel to unfamiliar settings, and to comprehend eras we will never be able to experience ourselves.
Therefore, option C and D are correct.
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Consider the amino acid below, which is called alanine
Which atoms give the amino acid its unique chemical and physical properties?
A.the CH3 group
B. the amino groups
C. the oxygen atom
D. the hydrogen atom
Answer:
A) the CH3 group
Explanation:
someone on this planet please help me with this vocab
Answer:
1 - concentrated solution
2- dilute solution
3- solubility
4- saturated solution
5- supersaturated solution
6- unsaturated solution
7- acid
8- base
9- corrosive
10- indicator
Explanation:
a cup of liquid is measured to have a temperature of 290 Celsius, what would that be in the Kelvin scale
Answer:
795k
Explanation:
C÷5=k-273÷9
290÷5 = k - 273 ÷ 9
k = 795
Which force acts on falling objects to oppose gravity?
pull
terminal velocity
air resistance
acceleration
Answer:pull
Explanation:
Amino acids are the building blocks of proteins. The simplest amino acid is glycine (H2NCH2COOH). Draw a Lewis structure for glycine. (Hint: The central atoms in the skeletal structure are nitrogen bonded to carbon, which is bonded to another carbon. The two oxygen atoms are bonded directly to the right-most carbon atom.) Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all hydrogen atoms and nonbonding electrons.
Answer:
Explanation:
The lewis structure (indicating all the atoms and patterns provided as hint in the question) of glycine can be seen in the attachment below. While the chemical structure of glycine can be seen below
H
|
H₂N - C - C =O
| \
H OH
The structure (of glycine) above provides a "fair idea" of how the lewis structure will be.
How is the kinetic energy of the particles of a substance affected during a phase change?
A.) Kinetic energy increases during exothermic changes and decreases during endothermic changes.
B.) Kinetic energy decreases during exothermic changes and increases during endothermic changes.
C.) Kinetic energy does not change, but the potential energy does.
D.) Kinetic energy changes in the opposite way that the potential energy changes.
Answer: A. Kinetic energy increases during exothermic changes and decreases during endothermic changes
Explanation: During an exothermic change potential energy is converted to kinetic energy. I hope this is correct. :)
Answer:
C
Explanation:
URGENT!!!
5. As the water temperature is increased
from 20°C to 90°C, how many more grams
of copper sulfate will dissolve in 100 grams
of water?
____g
Answer:
40
Explanation:
can someone help me with my chemistry on my page/account?
Answer:
Yes
Explanation:
Text me on here
Please help will give brainliest
Answer:
Number of moles = 1.57 mol
Explanation:
Given data:
Mass of propanol = 94.1 g
Molar mass of propanol = 60.1 g/mol
Number of moles of propanol = ?
Solution:
Formula:
Number of moles = mass/molar mass
by putting values,
Number of moles = 94.1 g/ 60.1 g/mol
Number of moles = 1.57 mol