Answer:
false
Explanation:
soft surfaces absorb sound. :)
Answer:
FALSE
FALSE FALSE FALSE FALSE FALSE
Explanation:
a 34.1 g of iron ore is treated as follows. the iron in the sample is all converted by a series of chemical reactions to fe2o3. the mass of fe2o3 is measured to be 13.3 grams. what was the percent iron in the sample of ore? answer in units of %.
The percent iron in the sample of ore is 27.30% .
Equation :The mass of Fe₂O₃ contains both iron and oxygen. First, we determine the amount of iron present in this compound. Then, when the mass of iron is conserved, the amount of iron present in the original ore will be the same.
Percentage iron in Fe₂O₃ = (2 * 56) * 100 / (2 * 56 + 3 * 16) = 70%
Therefore, out of the 13.3 grams of Fe₂O₃,
13.3 x 0.7 = 9.31 grams is iron
In the original ore, the percentage of iron is given by:
(9.31 x 100) / 34.1
The original ore had 27.30% iron.
What is compound ?A distinct substance created by the chemical union of two or more ingredients in a predetermined weight proportion to create a new antibiotic compound is an example of something that is created by the union of elements or parts. a word made up of parts that are words (such as rowboat, high school, devil-may-care).
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A 2.0 mL bubble of gas is released at the bottom of a lake where the pressure is 6.5 atm and the temperature is 10 degrees celsius. Predict the Celsius temperature of the gas bubble at the surface, where the pressure is 0.95 atm and the volume becomes 14.4 mL.
Let us assume that the bubble is h meters below the surface of the water, and P₀ is the atmospheric pressure.
Pressure only due to water at a depth of h meters would be equal to ρgh. Also, atmospheric pressure would be acting on the bubble. So, the total pressure on the gas bubble at that depth = P₀+ρgh=ρg×10+ρgh=ρg(h+10).
At the surface of water, only atmospheric pressure would be acting on the bubble i.e. P=P₀=ρg×10
As PV = constant, ρg(h+10)×V=ρg10×8V→h+10=80→h=70 meters.
Hence70m is the answer.Answer:
Explanation:
____ is a gemstone used in clocks and watches.
A. Carbon
B. Chalcopyrite
C. Quartz
D. Corundum
E. Galena
Answer: C
Explanation:
Clocks and watches are made out of Quartz
write the correct formulas that indicate only a physical change has taken place
1. 2NaCl + MgO -->
2. 2H2 + O2 -->
2NaCl + MgO → Na₂O + MgCl₂ and 2H₂ + O2 →2H₂O the correct formulas that indicate only a physical change has taken place
In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition
2NaCl + MgO → Na₂O + MgCl₂ has change the color as well as appearance and in the 2H₂ + O2 →2H₂O has also change in the physical changes
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How far does sound travel in air at 20ºC in 5 seconds?
Answer:
well, the speed is 343 m/s at 20 degrees Celsius
distance=speed*time
=343m/s *5s
=1715m
I need help, idk how to do PV=nRT
Answer:
107.64L
Explanation:
V= Volume in Liter
T= Temp in Kelvin (degrees celcius + 275)
N= # Mols
P= Pressure
R= Gas Constant for atm is .0821
so
for P
V=NRT/P
(4x,0821x295)/.900=107.64L
an element has an atomic number of 47 and 50 neutrons. What is the element's symbol?
Answer:
Silver Ag
Explanation:
A. What is the atomic number for this particle
B. What is the mass number of the particle
C.what is the overall charge on this particle
D. What element does this particle represent
E. Is this particle an atom or an ion
F. Write the symbol that represents this particle. Include the symbol, mass number, atomic number and charge
Answer:
A 16
B 30
C 2-
D sulphur
E ion
F. ( 30/16S2-)
Explanation:
Atoms have kinetic energy. Why?
Elements have a specific ______
number of _______
it is made up
of.
Answer:
Atomic number
Protons
Explanation:
Elements generally have specific atomic number of protons they are made up of.
An element is a distinct substance that cannot be split-up into simpler substances. Such substance are made up of only one kind of atom.
Each element has a unique atomic number The atomic number is used to differentiate between an element or the other. The atomic number is the number of protons in an atom.explain why a s bond formed by overlap of an s orbital with an sp3 orbital of carbon is stronger than a sbond formed by overlap of an s orbital with a p orbital of carbon
[tex]sp^{3}[/tex] orbital have less electron density than p orbital. Therefore on overlap of s orbital with [tex]sp^{3}[/tex] less repulsion take place than overlapping of sp3 orbital.
Electronegativity depends on s character.
In [tex]sp^{3}[/tex] there is hybridization between one s and 3 p orbital. Therefore, [tex]sp^{3}[/tex]have 25% of s character .
In p orbital , there is no s orbital present. Therefore s character is p orbital is [tex]0[/tex]% .
Higher the electronegativity means higher tendency to attract electron.
Thus, bond form by overlap of [tex]sp^{3}[/tex] and [tex]s[/tex] will be stronger than bond formed by overlap of [tex]s[/tex] with [tex]p[/tex].
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true or false: If the reactants have a mass of 100.00 grams, then the products must be equal to or less than 100.00 grams.
What elements makeup Mars' atmosphere?
Answer:
Carbon dioxide or co^2
Explanation:
write and balance the equation showing the reaction between iron (iii) oxide and carbon monoxide to form iron (ii) oxide and carbon oxide. sum the coefficients
The balanced chemical equation showing the reaction between iron (iii) oxide and carbon monoxide to form iron (ii) oxide and carbon oxide is :
FE2O3 + 3CO → 2FE +3CO2
Unbalanced:
Fe2O3 + CO → Fe + CO2
The atoms of iron on the reactant side is 2 but on the product side is 1, so have to change the coefficient of the iron of the product side. Place 3 with the CO in reactants and 3 with CO2 on the product side.
A balanced chemical equation is defined as the number of atoms of each type in the reaction being equal to the reactants and product sides.
The mass and charge is equal in a balanced chemical reaction.
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What is true of a gas
Answer:
did you have options, cause if you did chose something alond the lines of
Explanation:
A real gas is a gas that does not behave as an ideal gas due to interactions between gas molecules. A real gas is also known as a nonideal gas because the behavior of a real gas in only approximated by the ideal gas law.
13. (03.02 LC)
Which layer is between the crust and the asthenosphere? (7 points)
O LIthosphere
O Mesosphere
O Outer core
O Inner core
A compound contains chains of carbon atoms.
Which term best describes this compound?
polar
inorganic
ionic
organic
Answer:
My best guess would be organic compounds, good luck.
The term "organic" best describes the compound with chains of carbon atoms.
Option (D) is correct.
Organic compounds are characterized by containing carbon-hydrogen (C-H) bonds and often involve complex carbon-based structures. These compounds are typically associated with living organisms and are essential building blocks of life.
The presence of chains of carbon atoms indicates a molecular structure based on carbon-carbon bonds, which is a fundamental feature of organic compounds. In contrast, inorganic compounds generally lack carbon-hydrogen bonds and are typically simpler substances. Terms like "polar," "ionic," and "inorganic" do not specifically capture the essence of a compound consisting of carbon chains.
Therefore, the term "organic" accurately represents the nature of the compound and its connection to carbon-based chemistry and living systems.
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The question is incomplete. The complete question is:
A compound contains chains of carbon atoms.
Which term best describes this compound?
A) polar
B) inorganic
C) ionic
D) organic
PLZZZZZZZZZZZZ HELPPPPPPPPPPP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
A group of students simulates colliding air masses. Using an index card for separation, a jar of warm tap water with red food coloring is placed over a jar of cold water with yellow food coloring. The index card that separates the two bodies of water is removed. Students observe how the two fronts travel in relation to one another.
A.) Air masses are not distinguisable by color.
B.) Air masses are neither hot nor cold in temperature
C.) Air masses do not collide in real life
D.) Air masses cannot be modeled
One important function of the atmosphere is to provide the Earth and its people with the water needed for life.
T
True
F
False
can someone answer pls
What is the name of cells that have the ability to develop into different
kinds of cells?
Answer:
stem cells
Explanation:
hope it helps
if 2g of potassium are added to 50g of water, what mass of h2 is produced
Answer:
1950 grams
Explanation: The mass of potassium that must react with water to produce 50.0 grams of H2 is 1950 grams
describe how the results you obtained demonstrate the law of conversation of mass. Use a mathematical equation that demonstrates how your data matches the law of conversation of mass
A balanced chemical equation, which demonstrates that all mass is conserved throughout the reaction, demonstrates the law of conservation of mass. The quantity and types of atoms on either side of a chemical equation should be equal in a balanced chemical equation.
What is meant by the law of conservation of mass?In accordance with the principle of mass conservation, There is neither creation nor destruction of mass during a chemical process. In other words, the total masses of the reactants and products must be equal.
The reactants of photosynthesis are sunlight, 6 carbon dioxide, and 6 water. The mass of the products, which are 1 glucose and 6 oxygen, is equal to the mass of these reactants added together. Contrarily, cellular respiration uses glucose and oxygen gas to create water, carbon dioxide, and ATP, a source of useable energy.
The products of photosynthesis are the reactants of cellular respiration, which is the reverse of photosynthesis. The law of conservation of mass is also observed during cellular respiration.
A balanced chemical equation, which demonstrates that all mass is conserved throughout the reaction, demonstrates the law of conservation of mass. The quantity and types of atoms on either side of a chemical equation should be equal in a balanced chemical equation.
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how many atoms are in 5.5 dozen atoms
Answer: 66 atoms, I believe.
5.5 times 12/dozens + 66 Atoms
Hope this helps!
(5.5 dozen) x (12 atoms/dozen) = 66 atoms
a 40-kg dog on roller skates is acceleration at 2 m/s^2. What is the net force of the dog
Answer:
80 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 40 × 2
We have the final answer as
80 NHope this helps you
Can someone please help me
antimony has two naturally occuring isotopes, sb121sb121 and sb123sb123 . sb121sb121 has an atomic mass of 120.9038 u120.9038 u , and sb123sb123 has an atomic mass of 122.9042 u122.9042 u . antimony has an average atomic mass of 121.7601 u121.7601 u . what is the percent natural abundance of each isotope?
Considering the definition of atomic mass, isotopes and atomic mass of an element, sb121 has a percent natural abundance of 0.5726 or 57.26% and sb123 has a percent natural abundance of 0.4284 or 42.84%.
Definition of atomic massThe atomic mass is obtained by adding the number of protons and neutrons in a given nucleus of a chemical element.
Definition of isotopeIsotopes are the chemical elements in which atomic numbers are the same, but the number of neutrons is different.
Definition of atomic massThe atomic mass of an element is the weighted average mass of its natural isotopes.
This is, the atomic masses of elements are usually calculated as the weighted average of the masses of the different isotopes of each element, considering the relative abundance of each of them.
Percent natural abundance of each isotopeIn this case, antimony has two naturally occuring isotopes, sb121 and sb123. You know:
sb121 has an atomic mass of 120.9038 u.sb121 has a percent natural abundance of x.sb123 has an atomic mass of 122.9042 u.sb123 has a percent natural abundance of 1 -x (or, what is the same, the abundance is 100% - x%, since both isotopes form 100% of the element.)Antimony has an average atomic mass of 121.7601 uThe average mass of antimony is expressed as:
121.7601 u= 120.9038 u x + 122.9042 u× (1 -x)
Solving:
121.7601 u= 120.9038 u x + 122.9042 u - 122.9042 u x
121.7601 u - 122.9042 u= 120.9038 u x - 122.9042 u x
(-1.1441 u)= (-2.0014) x
(-1.1441 u)÷ (-2.0014)= x
0.5726= x or 57.26%
So, 1 -x= 1- 0.5716 → 1-x= 0.4284 or 42.84%
Finally, sb121 has a percent natural abundance of 0.5726 or 57.26% and sb123 has a percent natural abundance of 0.4284 or 42.84%.
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make a list of nature friendly development activities in your community
Answer:
Nature friendly activities include:
AfforestationBan on deforestationConservation of waterRecyclingReduce & ReuseUsing renewable energy.Hope it helps!
what are reactivity trends
Answer:
Explanation:
Major periodic trends include: electronegativity, ionization energy, electron affinity, atomic radius, melting point, and metallic character. Periodic trends, arising from the arrangement of the periodic table, provide chemists with an invaluable tool to quickly predict an element's properties.
What are the 7 diatomic elements?
Answer: Hydrogen, Nitrogen, Flourine, Oxygen, Iodine, Chlorine and Bromine
Explanation: