Final answer:
The coefficient that should be placed in front of H2O to balance the hydrogen atoms for the combustion of ethanol is 3. After balancing the hydrogen atoms, the fully balanced chemical equation for the combustion of ethanol is C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l).
Explanation:
To balance the hydrogen atoms in the combustion of ethanol, we start with the unbalanced equation C2H5OH(l) + O2(g) → CO2(g) + H2O(l). Ethanol (C2H5OH) contains 6 hydrogen atoms, and since each molecule of water (H2O) contains 2 hydrogen atoms, we need 3 molecules of water to account for all the hydrogen atoms from ethanol. Therefore, the coefficient for H2O in the balanced equation is 3.
After placing 3 in front of H2O, the equation looks like this: C2H5OH(l) + O2(g) → 2CO2(g) + 3H2O(l), which balances the hydrogen atoms. To complete the balancing, the oxygen atoms also need to be accounted for. In the product side, there are a total of 7 oxygen atoms (4 from the 2CO2 and 3 from the 3H2O). There is 1 oxygen atom in the ethanol molecule, so we need 6 more oxygen atoms from O2, which means we need 3 O2 molecules. Thus, the coefficient for O2 is 3. The fully balanced equation is C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l).
what is the eccentricity of earth
The eccentricity of Earth's orbit is a measure of its elliptical shape and is calculated using the distance to the foci and the semi-major axis of the orbit. Earth's orbital eccentricity is approximately 0.0167, indicating it is nearly circular with a slight elongation.
Explanation:The eccentricity of Earth's orbit is a measure of its deviation from a perfect circle. The orbit of Earth is slightly elliptical, with an eccentricity that is generally known to be less than 0.1, which means it is very close to circular. To calculate the eccentricity (e), one can use the formula e = f/a, where f is the distance from the center of an ellipse to one of the foci, and a is half the long axis of the ellipse.
For Earth's orbit, we have an average semi-major axis of approximately 1.496 × 10¹ meters (the average distance from the Earth to the Sun) and specific calculations yield an eccentricity value of approximately 0.0167. This is indeed less than 0.1, confirming that Earth's orbit is nearly circular, but with a slight elongation.
What change must occur in the chemical configuration of sulfur to achieve a noble gas configuration?
a__________________ is a landform with high elevation and a more or less level surface
the _________ contains the majority of the mass of the atom but is much ________ than the atom. A) nucleus, smaller B) neutrons, larger C) electron cloud, smaller D) pions and quarks, larger
Answer:
A) nucleus, smaller
Explanation:
The structure of an atom can be explained based on Rutherford's model according to which, most of the mass of an atom is concentrated in its positively charged core called the 'nucleus' whereas the negatively charged electrons move around it in fixed paths called orbits. The radius of the nucleus however is much smaller than that on the atom.
An element is usually represented in terms of its atomic mass (A) and atomic number(Z).
Atomic mass = protons + neutrons
Atomic number = number of protons
Therefore, the __nucleus_______ contains the majority of the mass of the atom but is much _smaller_______ than the atom.
Styrene has the empirical formula CH. it has a molar mass of 104g What is the multiplier to get the molecular formula? A.) 6 B.) 8 C.) 2 D.)4 E.) 10
Answer:
plato answer is b
Explanation:
where are metals, nonmetals and metalloids on the periodic table
Metals are placed on left side of periodic table and middle portion of it.Non-metals are placed on right side while the metalloids are along zig-zag line on right side of periodic table.
What is periodic table?It is the tabular display of elements which are discovered till date may it be natural or man -made.It provides a graphic representation of modern periodic law according to which elements are arranged in increasing order of their atomic numbers.
The table consists of seven horizontal rows called periods and 18 vertical columns called groups. The table has enabled classification of elements based on electronic configuration and atomic numbers.
The table is called periodic because the properties of elements repeat after regular intervals of atomic numbers.Hence ,elements with similar properties fall in same group of the periodic table.
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_______ is melted rock that does not reach earth's surface; intrusive igneous rocks form as magma slowly cools under the surface.
The blank should be filled with "Magma". Magma is melted rock beneath the Earth's surface. When magma slowly cools underground, it forms intrusive igneous rocks.
Magma is a mixture of molten rock, minerals, and gases that forms beneath the Earth's surface. It originates from the partial melting of rocks in the Earth's mantle or crust due to high temperature and pressure conditions.
When magma rises towards the Earth's surface, it can solidify underground before reaching the surface. This process occurs when the magma cools slowly over a long period of time. As it cools, the minerals within the magma crystallize and solidify to form intrusive igneous rocks. Since this process happens below the surface, intrusive igneous rocks are also known as plutonic rocks.
Intrusive igneous rocks have a coarse-grained texture because the slow cooling allows sufficient time for large mineral crystals to form. Examples of intrusive igneous rocks include granite, diorite, and gabbro. These rocks can be exposed at the Earth's surface through uplift and erosion, revealing the once-buried formations.
Which method would be best to separate a mixture of oil and water? separation by density separation by particle size filtration distillation
The most effective method to separate oil and water is by using density differences with a separatory funnel. Distillation is also suitable but more complex. Filtration and separation by particle size are not appropriate for this mixture.
The student asked: Which method would be best to separate a mixture of oil and water?
The best method to separate a mixture of oil and water is separation by density. Since oil and water have different densities, the oil will float on top of the water. Using a separatory funnel, you can pour out the water from the bottom, leaving the oil behind.
Another method that could be used is distillation. Since water and oil have different boiling points, heating the mixture will allow the water to boil and be collected separately from the oil. However, this method is more complex and generally less practical for simple separation tasks.
Filtration and separation by particle size are not effective methods for this type of mixture because both oil and water are liquids and do not have different particle sizes or solid components that can be filtered.
Correct Question - Which method would be best to separate a mixture of oil and water?
separation by density separation by particle size filtration distillationWhat is the average atomic mass of a sample of naturally occurring x, if it is comprised of the following isotopes 47% ^51X, 17% ^52X and 36% ^56X
The average atomic mass of a sample of naturally occurring element X, comprised of isotopes ^51X, ^52X, and ^56X with natural abundances of 47%, 17%, and 36%, is calculated to be 52.97 atomic mass units (amu).
Explanation:The average atomic mass of a sample of naturally occurring X can be calculated by taking into account the natural abundance of its isotopes. To find the average atomic mass of element X, we multiply the mass number of each isotope by its respective natural abundance (converted to a fraction), and then add these values together.
For isotopes ^51X, ^52X, and ^56X with natural abundances of 47%, 17%, and 36%, respectively, we calculate the average atomic mass as follows:
(47%/100) x 51 = 23.97 amu(17%/100) x 52 = 8.84 amu(36%/100) x 56 = 20.16 amuSumming these products gives us:
23.97 amu + 8.84 amu + 20.16 amu = 52.97 amu
Therefore, the average atomic mass of naturally occurring X is 52.97 amu.
PLEASE HELP!
What are physical combinations of different pure substances that can be separated into their original components by physical means?
A. mixtures
B. elements
C. molecules
D. compounds
The answer is A. Mixtures because they can still be seperated
Two identical atoms from Area B bond together. What type of bond will they most likely form
A. Electrostatic
B. Metallic
C. Ionic
D. Covalent
Answer:
Covalent Bonding
Explanation:
If atoms have similar electronegativities (the same affinity for electrons), covalent bonds are most likely to occur. Because both atoms have the same affinity for electrons and neither has a tendency to donate them, they share electrons in order to achieve octet configuration and become more stable.
how many valence electron do silver have
The number of valence electron in silver is one.
Valence electrons are the electrons that are found in the outermost shell of an atom. They are the electrons that are involved in chemical bonding.
The atomic number of silver is 47, which means that there are 47 protons in the nucleus of a silver atom. The number of electrons in a neutral atom is equal to the number of protons in the nucleus. This means that there are also 47 electrons in a neutral silver atom.
The electron configuration of silver is [Kr] 4d¹⁰ 5s¹. This means that the outermost shell of silver has 1 electron. The 4d¹⁰ electrons are filled, and the 5s¹ electron is the valence electron.
The valence electron of silver is important for its chemical properties. Silver is a good conductor of electricity because the valence electron is easily removed from the atom. This allows silver to form bonds with other atoms and conduct electricity.
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Which chemical formula shows an ionic compound?
A.
CO2
B.
N2O
C.
NaCl
D.
C6H12O6
]
Answer:
C. NaCl
Explanation:
I hope this helps! :D
find the density of a substance whose volume is 5 cm^3 and whose mass is 25 g.
You may calculate a substance's density by dividing its mass by its volume. Given a mass of 25 g and a volume of 5 cm^3, the density of the substance would be 5 g/cm^3.
Explanation:The density of a substance is calculated using the formula density = mass/volume. In this case, the mass of the substance is 25 grams and the volume is 5 cm3.
To calculate the density, we would dividing the mass by the volume, thus: density = 25 g / 5 cm3 = 5 g/cm3.
Therefore, the density of the substance is 5 g/cm3.
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What is magnesium oxide (A) a molecular compound with properties different from magnesium or oxygen (B) a molecular compound with the same properties as magnesium or oxygen (C) a shiny metal similar to magnesium but with a higher melting point (D) a iconic compound with properties different from magnesium or oxygen
Answer:
D a ionic compound with properties different from magnesium or oxygen.
Explanation:
A compound has a molar mass of 44.01 g/mol. What is its identity?
This problem is very vague since no other details are given. However for the sake of calculation let us assume that the compound is an ideal gas at STP.
So that the molar volume is: 1 mole = 22.4 L
density = (44.01 g/mol) * (1 mol / 22.4 L) = 1.96 g/L = 1.96 kg/m^3
Answer:
CO2
Explanation:
Carbon has a mass of 12.011 on the periodic table
Oxygen has a mass of 15.999 on the periodic table.
Well, there's one carbon and two oxygens in the compound CO2, and when you complete 12.011+15.999(2), you get 44.01 g/mol
Answer:
CO2
Explanation:
Carbon has a mass of 12.011 on the periodic table
Oxygen has a mass of 15.999 on the periodic table.
Well, there's one carbon and two oxygens in the compound CO2, and when you complete 12.011+15.999(2), you get 44.01 g/mol
An archaeologist finds a 1.62kg goblet that she believes to be made of pure gold. She determines that the volume of the goblet is 205mL. Calculate the density of the goblet
Which of the following is always involved in a scientific inquiry?
A.
knowing the correct answer before you start
B.
guessing what would happen instead of doing experiments
C.
coming up with questions based on observation and reasoning
D.
conducting surveys to ask people's opinions on various subjects
The option involved in a scientific inquiry is coming up with questions based on observation and reasoning.Hence option (C) is correct.
What is Scientific Enquiry ?Scientific inquiry have 2 functions : initial, to supply a descriptive account of however scientific inquiry is allotted in observe, and second, to supply associate instructive account of why scientific inquiry succeeds additionally because it seems to try and do in inbound at real information.
Scientific inquiry refers to the ways that during which scientists study the flora and fauna and propose explanations supported proof derived from their work.
Scientists use 3 kinds of investigations to analysis and develop explanations for events within the nature: descriptive investigation, comparative investigation, and experimental investigation.
Therefore, The option involved in a scientific inquiry is coming up with questions based on observation and reasoning. Hence option (C) is correct.
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The size of a minerals crystals depends on what?
If solar panels are placed under the sun at noon, then they will produce more energy than solar panels placed in the sun at dawn. What needs to be added to this statement to make it a hypothesis?
a prediction
an explanation
background information
a measurable outcome
What are minerals? What kinds of minerals are considered gems? (Site 1)
What do a prism, a magnifying glass, a microscope, and eyeglasses ALL have in common?
Which property is a chemical property? A. boiling point B. flammability C. density D. solubility
how many carbon atoms are in 4.00g of butane
Answer: 1.6221*10^23 atoms
Explanation:
Butane = C4H10
Molar mass = 58g/mol
1 mole of butane has 4 carbon atoms.
% of carbon in 1 mole of C4H10 = 4*12/58 =82.8%
Mass of carbon in 4g of butane = 82.8/100 *4 = 3.312g.
3.312g of carbon is equal to how many moles of carbon?
No.of moles = mass/ molar mass
3.312/12 = 0.276 moles.
Using Avogadro's number,
Number of atoms in any substance = Avogadro's constant * no of moles of that substance
(6.02214*10^23) * 0.276 = 1.6221*10^23 atoms.
All atoms of an element always have the same number of
Neutrons
Electrons
Electrons
Protons
Answer: Protons
The answer is the last one.
Which are homogeneous mixtures? Check all that apply.
vinegar
trail mix
orange juice with pulp
sugar water
sand
soda pop in a sealed bottle
Vinegar
Sugar water
Soda pop in a sealed bottle
Answer:A,D,F
Explanation:
what makes a question able to be answered by science?
SCIENCE HELP PLEASE!!!!!!!!!!!!!!!!!!!!
What is the density of 2.0 g of a substance that has a volume of 5.0 mL?
PLEASE ANSWER ASAP!!! D: kate gathered three boxes of the same size made of different materials: glass, clear, plastic, and alunium painted black. she placed them on a window sill in the sun for an hour and then measured the waremth if air in each box. in this experiment, the types of box materials are an A. constant variable B control C dependent variable D independent variable