Answer:
This is because the material of which the football is made up of expands during the day due to hot summer where the particles of it try to move away from each other whereas at night due t less temperature the contract therefore the football feels softer as before
One important function of the atmosphere is to provide the Earth and its people with the water needed for life.
T
True
F
False
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
which of the four cars had the least net force applied to it when it was launched down the ramp
The least net force applied : Car 3(12 N)
Further explanationNewton's 2nd law explains that the acceleration produced by the resultant force on an object is proportional and in line with the resultant force and inversely proportional to the mass of the object
∑F = m. a
Car 1 ⇒m=0.5 kg, a=36 m/s²
[tex]\tt \sum F=0.5\times 36=18~N[/tex]
Car 2⇒m=0.8 kg, a=50 m/s²
[tex]\tt \sum F=0.8\times 50=40~N[/tex]
Car 3⇒m=0.6, a=20 m/s²
[tex]\tt \sum F=0.6\times 20=12~N[/tex]
Car 4⇒m=1, a=19~m/s²
[tex]\tt \sum=1\times 19=19~N[/tex]
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
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.
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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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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compare LPG and CNG as a fuel with coal
Use the periodic table above to help you compare the elements cesium (Cs, #55) and Calcium (Ca, #20). Which of the following statements is true about the valence electrons of these two elements? (1 pt)
*
1 point
Cesium has more valence electrons and they are in a higher energy level than calcium's valence electrons.
Cesium has fewer valence electrons but they are in a higher energy level than calcium's valence electrons.
Cesium has more valence electrons and they are in a lower energy level than calcium's valence electrons.
Cesium has fewer valence electrons and they are in a lower energy level than calcium's valence electrons.
The statement which is true about the valence electrons of cesium and calcium is as follows:
Cesium has fewer valence electrons but they are at a higher energy level than calcium's valence electrons.Thus, the correct option for this question is B.
What are Valence electrons?
Valence electrons may be defined as the number of electrons that are present in the outermost shell of any element. For example, Sodium has an atomic number of 11. Its electronic configuration is 2, 8, and 1. Here, one electron is present in the outermost shell, so, sodium has only one valence electron.
According to the electronic configuration, it is found that cesium has only one valence electron, while calcium has two. So, the number of valence electrons is more in calcium as compared to cesium.
But, the valence electron found in cesium is at a higher energy level due to the completed d-orbital.
Therefore, the correct option for this question is B.
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an element has an atomic number of 47 and 50 neutrons. What is the element's symbol?
Answer:
Silver Ag
Explanation:
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
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.
describe beta and gamma radiation
Answer:
"Alpha radiation is the name for the emission of an alpha particle in fact an helium nuclei, beta radiation is the emission of electrons or positrons , and gamma radiation is the term used for the emission of energetic photons
Answer:
Alpha radiation is the name for the emission of an alpha particle in fact an helium nuclei, beta radiation is the emission of electrons or positrons , and gamma radiation is the term used for the emission of energetic photons.
Explanation:
Gamma Radiation
Frequently, gamma ray production accompanies nuclear reactions of all types. In the alpha decay of U-238, two gamma rays of different energies are emitted in addition to the alpha particle.
U92238→He24+Th90234+2γ00(17.3.4)
Virtually all of the nuclear reactions in this chapter also emit gamma rays, but for simplicity the gamma rays are generally not shown. Nuclear reactions produce a great deal more energy than chemical reactions. Chemical reactions release the difference between the chemical bond energy of the reactants and products, and the energies released have an order of magnitude of 1×103kJ/mol. Nuclear reactions release some of the binding energy and may convert tiny amounts of matter into energy. The energy released in a nuclear reaction has an order of magnitude of 1×1018kJ/mol. That means that nuclear changes involve almost a million times more energy per atom than chemical changes!
Beta radation
Beta radiation consists of high energy electrons emitted from the nucleus. These electrons have not come from the electron shells or energy levels around the nucleus. Instead, they form when a neutron splits into a proton and an electron.
Characteristics of Beta Radiation
Key characteristics of beta radiation are summarized in following points:
Beta particles are energetic electrons, they are relatively light and carry a single negative charge.
Their mass is equal to the mass of the orbital electrons with which they are interacting and unlike the alpha particle a much larger fraction of its kinetic energy can be lost in a single interaction.
Their path is not so straightforward. The beta particles follow a very zig-zag path through absorbing material. This resulting path of particle is longer than the linear penetration (range) into the material.
Since they have very low mass, beta particles reach mostly relativistic energies.
Beta particles also differ from other heavy charged particles in the fraction of energy lost by radiative process known as the bremsstrahlung. Therefore for high energy beta radiation shielding dense materials are inappropriate.
When the beta particle moves faster than the speed of light (phase velocity) in the material it generates a shock wave of electromagnetic radiation known as the Cherenkov radiation.
The beta emission has the continuous spectrum.
A 1 MeV beta particle can travel approximately 3.5 meters in air.
Due to the presence of the bremsstrahlung low atomic number (Z) materials are appropriate as beta particle shields.
e. A 10kg iron plate contains 2000J potential energy at a height cal Find out its height. A/S,
The height of the given iron plate is 20.41m
Potential energy is the energy that is acquired by an object due to its position or configuration. If we consider that 'm' to be the mass of the object and it is placed at a height 'h' above the horizontal surface, then the P.E. , 'P' of the thing is given by the equation:
P = mgh
where, g is that the acceleration due to gravity.
From the above equation height could be calculated as:
h = P /mg
From the question it might be clearly seen that,
P = 2000 J ; m = 10 Kg and allow us to consider g = 9.8 m/s²
h = 2000 / (10 * 9.8)
∴ h = 20.41 m
Therefore, the height of the given iron plate is 20.41m
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Graphite is a form of____.
A. Galena
B. Corundum
C. Chalcopyrite
D. Carbon
E. Bauxite
Answer:
D. Carbon
Explanation:
Graphite, archaically referred to as plumbago, is a crystalline form of the element carbon with its atoms arranged in a hexagonal structure. You'll get the substance when carbon is stacked in sheets. It occurs naturally in this form and is the most stable form of carbon under standard conditions. Under high pressures and temperatures, it converts to diamond. Graphite is used in pencils and lubricants. It is a good conductor of heat and electricity. Its high conductivity makes it useful in electronic products such as electrodes, batteries, and solar panels.
What is the molarity of a solution prepared by dissolving 1.25g of HCl gas
into enough water to make 30cm3 of solution
The molarity of a solution : 1.13 M
Further explanationMolarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution
[tex]\large \boxed {\bold {M ~ = ~ \dfrac {n} {V}}}[/tex]
Where
M = Molarity
n = Number of moles of solute
V = Volume of solution
mass HCl = 1.25 g
mol HCl(MW=36.5 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{1.25}{36.5}\\\\mol=0.034[/tex]
Volume of solution = 30 cm³ = 0.03 L
The molarity :
[tex]\tt M=\dfrac{0.034}{0.03}\\\\M=1.13[/tex]
Which statement describes Newton’s law of universal gravitation?
Mass has little effect on gravity between objects.
Gravity pushes objects away from Earth’s center.
Gravity does not act between Earth and the moon.
Every object in the universe attracts every other object.
Answer: Its D the last one.
Explanation:
Answer: I believe it’s d but I will come back and tell you if it’s wrong
Explanation:
Complete the nuclear equation
42 K → 0 e
19____-1
Answer:
42 19 K→42 20 Ca+e−
Explanation:
Naturally-occurring potassium atoms have a weighted average atomic mass of 39.10 (as seen on most modern versions of the periodic table.) Each potassium atom contains 19 protons p+ and thus an average potassium atom contains about 39.10−19≈20 neutrons n0.
This particular isotope of potassium-42 contains 42 nucleons (i.e., protons and neutrons, combined;) Like other isotopes of potassium 19 out of these nucleons are protons; the rest 42−19=23 are therefore neutrons.
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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Physical properties of reactants: Physical properties of products: 12.
When you mix baking soda (a white powder) and vinegar (a clear liquid), you produce carbon dioxide gas. Describe the properties of the reactants and products to show that a chemical change has occurred.
Answer: The reactants are baking soda and vinegar. Baking soda is a white powder, and vinegar is a clear liquid. The products of this reaction are carbon dioxide, water, and sodium acetate. Carbon dioxide is a colorless gas, water is a colorless liquid, and sodium acetate is a white crystalline powder.
A chemical change can be seen in how the molecular formulas of the products are different from the reactants, since the reactants have chemically changed into completely different molecules.
Hope this helps
mass number is the number of protons and neutrons in the nucleus of an isotope . how many electrons in an oxygen-18 atom ?
Answer:
In neutral oxygen atom 8 electrons are present
Explanation:
People sometimes talk about seeing shooting stars. What do they actually see?
Answer:
A ball of gas flying or a meter...
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
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.11. (03.03 MC)
What best describes the bonding in a water molecule? (5 points)
O An oxygen atom shares an electron pair with each H atom.
O An oxygen atom shares a single electron with each H atom.
) An oxygen atom receives an electron from each H atom.
O An oxygen atom transfers an electron to each H atom.
Answer:
A) An oxygen atom shares an electron pair with each H atom.
Explanation:
Non-living factors in an ecosystem are ______.
A. biotic
B. abiotic
C. antibiotic
PLEASE HELP!!!
Answer:
B. abiotic
Explanation:
in biology and ecology, abiotic components or abiotic factors are non living chemical and physical parts of the environment that affect living organisms and the functioning of ecosystems.
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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Which of the following is not a product of cellular respiration?
a. CO2
b. Energy
c. C6H1206
d. H2O
Please select the best answer from the choices provided
Ο Α
ОВ
Ос
OD
Answer:
C
Explanation:
In the chemical equation of cellular respiration, C₆H₁₂O₆ is not a product of cellular respiration.
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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One of your classmates tells you, “Since atoms are the basic building blocks of matter, all atoms have to be the same. Do you agree or disagree with this statement? Explain your reasoning.
What are the 7 diatomic elements?
Answer: Hydrogen, Nitrogen, Flourine, Oxygen, Iodine, Chlorine and Bromine
Explanation: