Answer:
CH4(g)+2O2(g)→CO2(g)+2H2O(g)
Explanation:
For a complete combustion reaction of a hydrocarbon, oxygen is always one of the reactants, and the products are always carbon dioxide and water.
Which of the following subject areas contains questions that can be answered by science?
O Astronomy
O Alchemy
O Ethics
O Religion
Answer:
A
Explanation:
K took the test
Astronomy subject areas contains questions that can be answered by science. Thus option A is correct.
What is Astronomy?The science deals with extraterrestrial objects and phenomena, that is everything in our universe beyond the atmosphere of our planet.
This science is more observational than experimental. Astronomy can be up two types such as observational astronomy and theoretical astronomy.
Now a day, the field of astronomy has been expanded enormously in different field of subjects like astrometry, planetary astronomy, astrophysics, astrobiology, astrochemistry, etc.
The field of astrophysics is used understand the nature of celestial objects and their physical processes involve in the formation and emission of radiation.
Other research application include the chemical composition of stars, study of nuclear reactions to know the details about the the radiation energy release from stars.
Thus, Option A is correct.
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Balance the equation
Ca(s) + H3PO4(aq) ---->Ca3(PO4)2(s) + H2(g)
(20 points) In the morning, you decide to make toasted bacon, lettuce, and tomato sandwich. Observe what happens in each stage of making the sandwich. Which parts involve only chemical changes happening?
I. The first thing you do is cut two slices of bread.
II. Then you put the slices in the toaster to cook. When the toaster is done, it pops the III. warm brown toast. You cook the bacon in a frying pan you put bacon, lettuce, and tomato on the bread, trimming the sides.
IV. You can smell the old bread in the garbage going moldy.
Steps I and II
Steps II and III
Steps II and IV
Steps III and IV
Answer:
C is the answer I did it and got it right
outlines four uses of fat and oil
Fats and oils are used throughout the world for both food applications and industrial uses. They are consumed in butter, shortening, margarine, salad oils, and cooking oils, as well as in animal feeds, fatty acids, soaps, personal care products, biodiesel, paints (made from alkyd resins), lubricants, and greases.
Hydrocarbons (alkanes, alkenes, alkynes) have all the properties below except one.
Which is not a property of hydrocarbons?
A.nonpolar
B.high melting and boiling points
C.insoluble in water
D.flammable
Answer:
B
Explanation:
The answer is B. All hydrocarbons are nonpolar, they are insoluble in water and they are highly flammable. Now, not all hydrocarbons have high boiling and melting point. For example, methane (CH4) has a boiling point of something clode to -161°C, and that is low. The boiling point increases when the number of carbon atoms in a compound increases, and based on methane and this theory, not all hydrocarbond have a high boiling point. This makes option B be the correct answer.
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Answer:
what is meaning of this.
Answer:
On April 30, 1789, George Washington, standing on the balcony of Federal Hall on Wall Street in New York, took his oath of office as the first President of the United States.
plzz help me cant remember the parts of the flower.
A is the petal and b is the leaf. I think.
A 1.8 mole sample of a compound weighs 195 g and is found to be 11.18% H and 88.82% C. What is the molecular formula for the compound?
Answer:
C8H12
Explanation:
First find the molar mass
195/1.8 × 1 = 108.3 gmol-1
Then the molecular formula
Mass of C in 1 mole of compound = 88.82×108.3/100
= 96.2 g
Mass of H in 1 mol of.the compound = 108.3×11.18/100 = 12.11 g
Divide the mass by their molar masses to get no. of moles in 108.3 g of compound or 1 mole of compound
Moles of C in one Mole of compound = 96.2g/12 gmol-1 = 8 mol
Moles of H in 1 mole of compound = 12.11g/1 gmol-1 =12 mol
Since we need the molecular formula it's C8H12
What type of mixture is this illustration?
Answer:
Suspension
Explanation:
It's a suspension because it is not mixed at all, and has distinctly separate layers.
375cm³ of a gas has a pressure of 770 mm Hg, find it Volume if the pressure is reduced to 750 mm Hg
Answer:
Explanation:
Givens
v1 = 375 cm^3
P1 = 770 mm Hg
V2 = ?
P2 = 750 mm Hg
Formula
V1 P1 = V2 P2
Solution
375 * 770 = V2 * 750 Combine the left
288750 = V2 * 750 Divide both sides by 750
288750/750 = V2
V2 = 385
The table compares vapor pressure values for water ethanol and diethyl ether Add six temperatures determine the approximate normal boiling point for each substance what do the data suggest about the relative strength of attraction between particles in each substance
Water has the strongest intermolecular forces followed by ethanol and diethyl ether has the least intermolecular forces.
From the table, we can see the vapor pressures of water, ethanol and diethyl ether. The boiling point of water is 100°C, the boiling point of ethanol is 80°C while the boiling point of diethyl ether is 40°C.
We can see that the vapor pressures and approximate normal boiling points of the substances varies with the nature of intermolecular bond forces in the molecule.
Water has highest boiling point and the lowest vapor pressure followed by ethanol. Diethyl ether has the highest vapor pressure and lowest boiling point from the data in the table.
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What is scalar quantity ?
Answer:
they physical quantities that are uneffected by changes to a vector space basis
Certain __________ metals like gold are found as pure metals rather than ores in the earth. Complete the sentence.
Answer:
nonreactive
Explanation:
explain why water wasn't used in crackers?
WILL MARK BRAINLIEST IF YOU ANSWER EVERY QUESTION!!!!
Answer:
The answer for number one is .A
The answer for number two is heat rises
Explanation:
What is the difference between melting and burning a substance? Is mass conserved in either process?
Answer:
Explanation:
First Question:
Melting is a physical process that involves the phase transition of a substance from its solid to its liquid state. Burning, on the other hand, is a chemical process that involves a substance being broken down and changed into different substances. It's still the same substance, though: water.
Second Question:
Mass is therefore never conserved because a little of it turns into energy (or a little energy turns into mass) in every reaction. But mass+energy is always conserved. Energy cannot be created out of anything.
Compare the average motion of the particles in the 3 containers of water
Answer:
c>b=a
Explanation:
It is important to note that mass does not affect the average motion/energy per molecule, but temperature does. the higher the temperature the faster the particles are. A has the same temperature as B, so they have the same amount of motion. C is warmer than A and B, so the average motion of the particles in beaker C is the largest
Calculate the freezing point of a solution of 3.46 g of a compound, X, in 160 g of benzene. When a separate sample of X was vaporised, its density was found to be 3.27 g/Lat 116°C and 773 torr. The freezing point of pure benzene is 5.45°C, and Kis 5.12°C kg/mol.
Answer:
Calculate the freezing point of a solution of 3.46 g of a compound,X,in 160 g of benzene. When separate sample of X was vaporised, its density was found 3.27 g/L at 116 c and 773 torr. The freezing point of pure benzen is 5.45 c, and kf is 5 .12 c/m.
Explanation:
First determine molar mass from
P*molar mass = density*R*T
Solve for molar mass. Then
moles = grams/molar mass
Solve for moles
molality = moles/kg solvent
Solve for molality
delta T = Kf*m
Solve for delta T, then convert to freezing point
Write a five-sentence paragraph describing the nature and background of basketball.
Answer:
The history of basketball began with its invention in 1891 in Springfield, Massachusetts by Canadian physical education instructor James Naismith as a less injury-prone sport than football. Naismith was a 31-year old graduate student when he created the indoor sport to keep athletes indoors during the winters.
Explanation:
The history of basketball began with its invention in 1891 in Springfield, Massachusetts by Canadian physical education instructor James Naismith as a less injury-prone sport than football. Naismith was a 31-year old graduate student when he created the indoor sport to keep athletes indoors during the winters.
some uses of sodium bicarbonate
Answer:
Sodium bicarbonate is an antacid used to relieve heartburn and acid indigestion. Your doctor also may prescribe sodium bicarbonate to make your blood or urine less acidic in certain conditions. This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.
The most abundant element in the earth's crust is ____________ .
Answer:
Hey mate.....
Explanation:
This is ur answer....
OxygenHope it helps!
Brainliest pls!
Follow me! :D
What would be the atomic number of this atom?
Answer:
1 would be the answer
protons = atomic # I think
Answer:
hydrogen
Explanation:
hydrogen has the atomic number of 1 which means that hydrogen has one proton and is neutral so it has one electron as well.
Diamond has a macromolecular structure and iodine is a simple covalent molecule. Use your knowledge of structure and bonding to explain why diamond has a higher melting point than iodine.
Answer:
Diamond is covalently bonded and has a giant covalent structure. Covalent bonds require lots of energy to break as they are strong so diamond has the highest melting point. Iodine has only weak intermolecular forces (instantaneous dipole-dipole interactions or London forces) whereas hydrogen fluoride has a permanent dipole and can hydrogen bond (as well as having London forces).
Explanation:
hope to help
how many moles of s atoms are in 1 mol of CaSO4
I think u asked for the atoms of sulfur? its 4..
Explanation:
calcium = 4
sulfur = 4
oxygen = 4
I hope this is correct
Hydrogen fusion creates _____ and lots of energy.
Explanation:
Fusion processes require fuel and a confined environment with sufficient temperature, pressure, and confinement time to create a plasma in which fusion can occur. The combination of these figures that results in a power-producing system is known as the Lawson criterion. In stars, the most common fuel is hydrogen, and gravity provides extremely long confinement times that reach the conditions needed for fusion energy production. Proposed fusion reactors generally use hydrogen isotopes such as deuterium and tritium (and especially a mixture of the two), which react more easily than hydrogen to allow them to reach the Lawson criterion requirements with less extreme conditions. Most designs aim to heat their fuel to around 100 million degrees, which presents a major challenge in producing a successful design.
As a source of power, nuclear fusion is expected to have many advantages over fission. These include reduced radioactivity in operation and little high-level nuclear waste, ample fuel supplies, and increased safety. However, the necessary combination of temperature, pressure, and duration has proven to be difficult to produce in a practical and economical manner. Research into fusion reactors began in the 1940s, but to date, no design has produced more fusion power output than the electrical power input.[1] A second issue that affects common reactions is managing neutrons that are released during the reaction, which over time degrade many common materials used within the reaction chamber.
Fusion researchers have investigated various confinement concepts. The early emphasis was on three main systems: z-pinch, stellarator, and magnetic mirror. The current leading designs are the tokamak and inertial confinement (ICF) by laser. Both designs are under research at very large scales, most notably the ITER tokamak in
Which of the following two combinations are correct?
Answer:
D
Explanation:
Copper has a more positive reduction potential than Hydrogen and is below Hydrogen in the reactivity series. So it can't displace H+ from diluted acids. Therefore Cu doesn't form Cu salt and a gas
Fe, Zn and Mg are above Hydrogen in the electrochemical series and can displace Hydrogen as follows
Fe(s) + 2HCl(aq) ----> FeCl2 +H2 (g)
Mg(s) + 2HCl(aq) ----> MgCl2 (aq) +H2 (g)
So iii is wrong
Zn(s) +2HCl(aq) ----> ZnCl2(aq) +H2 (g)
Can anyone help me with this question?
sure i can help
so u have to ask someone else
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How are elements in the same family in the periodic table alike?
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The Correct choice is ~ C
They have the same number of electron shells~
Explanation:
option C is correct.....
acetone
56
turpentine
160
propane
-43
glycerin
290
In which substance are the electrostatic forces between molecules the strongest?
(1 point)
- propane
- turpentine
- glycerin
- acetone
The electrostatic forces between molecules of glycerin are the strongest.
We have 4 compounds with their respective boiling points.
acetone 56 °C turpentine 160 °C propane -43 °C glycerin 290 °CThe boiling point is the temperature at which a substance passes from the liquid state to the gaseous state.
A high boiling point indicates that the intermolecular forces are strong, so more energy is needed to separate the molecules in the vaporization.
Thus, glycerin, with the highest boiling point, is expected to have the strongest electrostatic forces between their molecules.
The electrostatic forces between molecules of glycerin are the strongest.
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Answer:
Glycerin
Explanation: