Answers
Here is your answer:
The proper answer to this question is option B "a data table". Data tables are not examples of scientific models.
Your answer is B.
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Related Questions
What has research determined about the orbit of an electron around a nucleus
Answers
Here is your answer:
The proper answer to this question is that "each sub-level electron type has a unique path where it will likely to be found".
If you need anymore help feel free to ask me!
Hope this helps!
Answer:
Check explanation.
Explanation:
INTRODUCTION: Many researches has been done on atoms. One of them is the one done by Both. Bohr research in 1913 on atom made him to proposed the "Bohr Atomic Model''. With this model, Bohr was able to proposed his quantized shell model.
Bohr made modifications to the Model proposed by Rutherford to solve the stability problem.
RESEARCH PROGRESS: with Bohr research, he was able to explain that the angular momentum of electrons are quantized. He explained that electrons can have stable orbits around the nucleus.
Borh was also able to explain the emission and absorption of energy, when electrons jump from one orbit to another.
What volume would a 200.0 g sample of hydrogen sulfide gas occupy at stp?
Answers
Final answer:
A 200.0 g sample of hydrogen sulfide gas would occupy a volume of 133.5 liters at STP.
Explanation:
To calculate the volume that a 200.0 g sample of hydrogen sulfide gas would occupy at STP, we need to use the ideal gas law equation: PV = nRT.
First, we need to convert the mass of hydrogen sulfide (H2S) into moles. The molar mass of H2S is 34.08 g/mol. So, 200.0 g of H2S is equal to 200.0 g / 34.08 g/mol = 5.86 mol.
At STP conditions, the pressure (P) is 1 atm and the temperature (T) is 273 K. We can substitute these values along with the molar amount of hydrogen sulfide (n) into the ideal gas law equation to solve for the volume (V).
V = nRT / P = (5.86 mol)(0.0821 L·atm/mol·K)(273 K) / (1 atm) = 133.5 L
Therefore, a 200.0 g sample of hydrogen sulfide gas would occupy a volume of 133.5 liters at STP.
A capital letter or a combination of a capital letter and a small letter that is used to represent an element is called ____
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All chemical elements have their chemical symbols consisting of one or two Latin letters. A chemical symbol is a chemical element mark. For the symbol of a chemical element it takes the first letter of its name in Latin, and if several elements have a name that begins with the same letter, in most of the symbols there is another characteristic letter from the name. The symbols are written in a large Latin letter, and if there is another letter, it is written a small.
( pls help me) brainlest answer too
4.) Heat is transferred through a piece of metal by _____.
conduction
convection
radiation
5.) Heat from the sun travels to earth by _____.
conduction
convection
radiation
6.) Energy in a vacuum travels by ___.
conduction
convection
radiation
7.) In a convection current _____.
A.) warm fluid sinks to replace cool fluid
B.)warm fluid is more dense, and therefore, rises
C.)cool fluid is more dense, and therefore, sinks
D.)heat flows from cooler areas to warmer areas
8.) Nuclear reactions occurring in the Sun _____. Select all that apply.
generate light
generate heat
absorb a lot of energy
fuse atoms of hydrogen to make helium atoms
9.) Which of the following statements is true?
A.) Temperature is an average measure of the heat energy in a substance.
B.)The transfer of heat in a fluid does not require physical contact between molecules.
C.)The sun's energy comes from the nuclear reactions of changing hydrogen into helium.
D.)All of the above.ω∵
Answers
4.) Heat is transferred through a piece of metal by _____.
conduction
Conduction happens when both items are in close contact. In a piece of metal. In this case, the heat transfers gradually into the other ends of the object. This makes the transfer rate is slow on a long object with a low surface area.
5.) Heat from the sun travels to earth by _____.
radiation
Sun energy comes from a reaction that will produce a light and heat and it is transferred to the earth by radiation. While conduction and convection need contact with the object, radiation doesn't. Radiation can travels a very long distance, that is why the heat could be delivered to the earth.
6.) Energy in a vacuum travels by ___.
radiation
One of the examples for energy travels in a vacuum would be sunlight. Sun and earth are separated by vacuum space which means there is no direct contact between earth and sun. That means conduction and convection are not possible.
7.) In a convection current _____.
C.)cool fluid is more dense, and therefore, sinks
Cool fluid have lower volume, thus become denser than warm fluid. Since its density higher than the warm fluid, it will sinks and moves toward the earth. The warm fluid also rises to replace the cool fluid.
8.) Nuclear reactions occurring in the Sun _____. Select all that apply.
generate light
generate heat
fuse atoms of hydrogen to make helium atoms
Sun is bright and hot, which means it produces light and heat. The reaction should be producing energy, not absorbing energy. The reaction that produces that energy would be the fusion reaction of hydrogen into helium.
9.) Which of the following statements is true?
C.)The sun's energy comes from the nuclear reactions of changing hydrogen into helium.
The sun reaction is right, it is forming helium using hydrogens.
Transfer of heat in liquid mostly happens because convection which need direct contact. But the heat can transfer by radiation too, so its a bit ambiguous.
Temperature represents the average kinetic energy of the molecule and it is different with heat/thermal energy.
What describes the change in Gibbs free energy (∆G) of a spontaneous reaction?
A. ∆G < 0
B. ∆G > 0
C. ∆G = 0
Answers
Answer: The correct answer is Option A.
Explanation:
Gibbs Free energy is defined as amount of useful work that can be done in the system. It is equal to the enthalpy of the reaction minus the product of entropy of the reaction and absolute temperature.
Mathematically,
[tex]\Delta G=\Delta H-T\Delta S[/tex]
Where,
[tex]\Delta G[/tex] = Gibbs free energy
[tex]\Delta H[/tex] = Enthalpy of the reaction
[tex]\Delta S[/tex] = Entropy of the reaction
T = Absolute temperature
Sign Convention for Gibbs Free energy:
If [tex]\Delta G<0[/tex], it is considered as a Spontaneous reaction.
If [tex]\Delta G>0[/tex], it is considered as a Non-Spontaneous reaction.
If [tex]\Delta G=0[/tex], reaction is in equilibrium.
Hence, the correct answer is Option A.
Final answer:
The change in Gibbs free energy for a spontaneous reaction is ΔG < 0, signaling that the process occurs naturally without external forces, and equilibrium is characterized by ΔG = 0 (Option C).
Explanation:
The change in Gibbs free energy (ΔG) of a spontaneous reaction is described by a negative value, which is option A: ΔG < 0. This negative change indicates a spontaneous process in which a system naturally evolves without external intervention. At equilibrium, ΔG is equal to zero, signifying no net change in the system's state. If ΔG is positive, the reaction is not spontaneous and may only proceed with an input of energy.
These concepts are fundamental in understanding chemical thermodynamics, where ΔG combines enthalpy and entropy changes within a system to determine the spontaneity of reactions under constant temperature and pressure. A spontaneous chemical reaction will have its Gibbs free energy decreasing, typically indicative of exothermic reactions or those that increase the total entropy.
What is the molarity of a solution containing 8.0 grams of solute in 0.50kg of solvent?
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mole of the solute = 0.8g x (1mol / 24g)
= 0.0333mol
molality = mol of solute / kg of solvent
= 0.333mol / 0.50kg
= 0.666M or 0.67M
Answer:
0.67m
Explanation:
What is a brief summary of your academic and work history
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When you apply for jobs, companies typically require that applicants provide their work history, either on their resume or on a job application, or both.
The job application may ask for information on your most recent jobs, typically two to five positions. Or, the employer may ask for a number of years of experience, typically five to ten years of experience.
Employers generally want information on the company you worked for, your job title, and the dates you were employed there. However, sometimes the employer will ask for a more detailed employment history and more information on the jobs you have held as part of the hiring process. For example, he or she might ask for the name and contact information for your previous supervisors.
Your academic standing is calculated at the end of each term based upon your current and cumulative UCSC GPA. If both your current and cumulative UCSC GPAs are 2.0 or greater, then you are in good academic standing. If either your current or cumulative GPA is less than 2.0, then you are on academic probation. In that event, you should consult with your college academic preceptor about what you need to do to return to good standing. If your current UCSC GPA falls below 1.5 in any term, or if you are already on academic probation and your cumulative UCSC GPA falls below 2.0, then you are subject to disqualification from further enrollment in the university.
The oxygen gas produced in part a has a density of 1.43g/l.calculate the volume of of the o2 gas produced pg 76
Answers
LiClO4(s) →LiCl(s) + 2O2(g)
m(LiClO4)=100g
a) m(O2)=?
From the reaction we got the following number of moles ratio:
n(LiClO4) : n(02) = 1 : 2
So, from the ratio, we can determine number of moles from O2:
n(02)= n(LiClO4) x 2 = (m/M) x 2 = 100/106.4 x 2= 1.9 mole
Now we can calculate the mass of oxygen:
m(O2)=n x M = 1.9 x 32 = 60.15 g
b) V(O2)=?
Now when we have the value of the mass of oxygen, we can calculate its volume with density equation:
d(O2)=m(O2)/V(O2) ⇒ V(O2)= m(O2)/d(O2)
V(O2) = 60.15 / 1.43
V(02) = 42.06 L
What is the atomic nucleus made of ?
only neutrons
electrons
only protons
nucleons
Answers
Explanation:
The nucleons are the particles that constitue the nuclei of the atoms. Those are protons and neutrons.
They are not elementary particles (quarks are the elementary particles that form both protons and neutrons).
Protons are the particles that define the elements. Any different elements have different number of protons. H has one proton, He has 2 protons, Li has three protons, Na has 11 protons, U has 92 protons.
Protons are positively charged and the number of protons in any neutral atom is equal to the number of electrons (the electrons, which are elementary negatively charged particles, are around the nucleous).
Neutrons have not charge and are responsible for the stability of the nuclei. They are fundamental to avoid that the repulsion forces between the positively charged protons ends causing the collapse of the nuclei.
The atomic nucleus is made of Nucleons
Assuming all volume measurements are made at the same temperature and pressure, how many liters of oxygen gas would it take to react completely with 7.25 liters of hydrogen gas? show all of the work used to solve this problem. balanced equation: 2h2 (g) + o2 (g) yields 2h2 o(g)
Answers
2H2(g) + O2(g) -> 2H2O(g)
2L ..........1L ..........2L
7.25L .....3.63L .....7.25L
The only work is dividing 7.25 by 2.
STP refers to:
Question options:
100 deg C and 1 atm.
0 deg C and 1 kPa.
0 deg C and 1 atm.
100 deg C and 760 mm Hg.
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Standard temperature is defined as zero degrees Celsius (0° C)
Standard pressure supports 760 millimeters in a mercurial barometer (760 mmHg)
we have that
760 mmHg= 1 atm
therefore
the answer is 0 deg C and 1 atm.
Which of the following is a molecule but not a compound?
A He
B f2
C h2O
D CH4
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Which is responsible for the high thermal energy required to melt ice? (1 point)?
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To know how, first, we have to know that how much the molecules of the substance are moving relative to another one by measuring the temperature. when the temperature gets higher the more molecules are moving. all these moves of the molecules take energy.In our case, we are talking about the pure water H2O the reason that makes the more energy used to get the molecules of water moving and raising the temperature is that the molecules of water are sticking together tightly, As the water molecules are very polar. One side is negative charge O- and the other is a positive charge H+ (It's just like a magnet).So the attraction between the water molecules makes the movement of those molcules harder to move. So to break this attraction, we need more energy to raise the water temperature to change the water phase from solid (ice) to liquid phase.
An acid is a substance that increases the concentration of H3O+ ions in solution. Look at the reaction below of phenol (C6H5OH) with water: mc023-1.jpg Which reactant acts as an acid by contributing a H+ ion to create H3O+ in the chemical equation? C6H5OH(aq) H2O(l) C6H5O–(aq) H3O+(aq)
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Chemical reaction: C₆H₅OH(aq) + H₂O(l) → C₆H₅O⁻(aq) + H₃O⁺(aq).
As reactant phenol (C₆H₅OH) has neutral charge and as product of reaction has negative charge (1-), So in this chemical reaction phenol gives one proton (H⁺) to the water and water became hydronium ion (H₃O⁺).
Imagine that you have isolated a mysterious liquid from a sample of food. you add the liquid to a beaker of water and shake vigorously. after a few minutes, the water and the other liquid separate into two layers. to which class of biological molecules does the unknown liquid most likely belong
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How do you determine whether a molecule is polar? select all that apply. select all that apply. determine whether the polar bonds add together to form a net dipole moment. determine if the bonds are ionic or covalent. draw the lewis structure for the molecule and determine the molecular geometry. determine whether the molecule contains polar bonds?
Answers
To determine if a molecule is polar, ascertain if it contains polar bonds, draw the Lewis structure to visualize molecular geometry, and confirm if the polar bonds sum up to a net dipole moment. Molecules with a net dipole moment are polar. Geometry of the molecule also plays a key role; polar molecules can turn nonpolar if the geometry causes bond dipoles to cancel each other out.
Explanation:There are a few steps to determine whether a molecule is polar. Firstly, it is important to determine whether the molecule contains polar bonds, which include ions and atoms with differing electronegativities resulting in a bond dipole moment. A polar bond has a partially positive charge on one atom and a partially negative charge on the other.
Drawing the Lewis structure for the molecule can help to visualize the molecular geometry. According to VSEPR theory, a molecule can be nonpolar if its geometry is structured in a way that the bond dipoles cancel each other out, such as in the case of CO₂ which is linear in shape. The opposite side bonds, even though polar, cancel each other out due to their antiparallel arrangement, making the molecule nonpolar. Nevertheless, in contrast, H2O has a bent shape due to lone pairs on the Oxygen atom, leading to an overall dipole moment therefore making the molecule polar.
Lastly, if polar bonds in the molecule add up to form a net dipole moment, the molecule is polar. The dipole moment measures the extent of net charge separation in the molecule and is calculated by summing the bond moments in three-dimensional space.
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A solution containing more than the equilibrium amount is called ________
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____________________________________________________
True or false according to the principle of base pairing hydrogen bonds could form only between adenine and cytosine
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According to the principle of base pairing hydrogen bonds could form between adenine and thymine (two hydrogen bonds between this nucleobases) and guanine and cytosine (three hydrogen bonds between this nucleobases).
Adenine and guanine are purine derivatives and thymine and cytosine are pyrimidine derivates.
The statement is false; hydrogen bonds form between adenine and thymine, and between cytosine and guanine based on the principle of base pairing.
According to the principle of base pairing, hydrogen bonds form specifically between adenine (A) and thymine (T), and between cytosine (C) and guanine (G). Adenine forms two hydrogen bonds with thymine, while cytosine forms three hydrogen bonds with guanine. This specific pairing is crucial for the stability and structure of the DNA double helix.
How many electrons are involved when two atoms in a molecule are connected by a "double bond"? write the lewis structure of a molecule containing a double bond?
Answers
Explanation:
Each bond is formed by a pair of electrons. So, two bond involve two pairs of electrons, which is 2 * 2 = 4 electrons.
The Lewis structure for a doble bond is:
X : : X
where the dots represent the electrons, and one dot beside other dot is a pair of electrons formin a bond.
So, there you have two pair of electrons representing two bonds or one double bond.
In a double bond, four electrons are shared between two atoms.
When two atoms in a molecule are connected by a double bond, four electrons are involved. This is because a double bond consists of two pairs of electrons that are shared between the atoms. The Lewis structure of a molecule containing a double bond follows specific steps:
Determine the total number of valence electrons available for bonding.
Write a plausible skeletal structure for the molecule with the least electronegative atom typically in the center.
Arrange the electrons to satisfy the octet rule for each atom, which often means forming double or triple bonds to account for all electrons.
Count the number of regions of electron density (lone pairs and bonds) around the central atom. Remember, a single, double, or triple bond counts as one region of electron density.
Ensure the total number of electrons used (bonding plus non-bonding) is equal to the available valence electrons.
Let's consider the molecule of ethene (C2H4) as an example:
Two carbon (C) atoms contribute a total of 8 valence electrons (2 x 4 electrons).
Four hydrogen (H) atoms contribute a total of 4 valence electrons (4 x 1 electron).
The total number of valence electrons is 12.
The Lewis structure shows each carbon atom single-bonded to two hydrogen atoms and double-bonded to each other, with no lone pairs on the carbons, thus satisfying the octet rule.
Explain the effect of Earth’s gravity on objects on the surface of Earth.
Answers
Gravity pulls objects toward Earth at a rate of 9.8 m/s2. Weight is the result of gravity's pull on a mass on Earth's surface.
The effect of Earth's gravity on objects on the surface of Earth is to pull them toward the center of the planet, creating a downward force known as weight.
Gravity is the force of attraction between two objects with mass, and it is directly proportional to the mass of the objects and inversely proportional to the square of the distance between them. On Earth's surface, all objects experience the gravitational pull of the planet, causing them to be pulled toward the center of the Earth.
The strength of this gravitational force depends on two factors: the mass of the Earth and the distance from the object to the center of the Earth. Earth's mass is constant, so the force of gravity primarily varies with an object's distance from the center of the planet. Objects closer to the Earth's surface experience a stronger gravitational force, while those at higher altitudes experience a weaker force.
This gravitational force gives objects weight, which is a measure of the force of gravity acting on them. Weight is commonly measured in units such as pounds or kilograms. When an object is at rest on the surface of the Earth, it experiences a gravitational force equal to its weight, which is directed toward the center of the Earth.
In summary, Earth's gravity exerts a downward force on objects on its surface, giving them weight and keeping them anchored to the planet. This force is responsible for objects falling when dropped, and it plays a fundamental role in the physics of everyday life.
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If the volume of a container of gas is reduced, what will happen to the pressure inside the container?
a. The pressure will increase.
b. The pressure will not change.
c. The pressure will decrease.
d. The pressure depends on the type of gas.
Answers
Answer: a. The pressure will increase.
Explanation:
Boyle's Law: This law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.
[tex]P\propto \frac{1}{V}[/tex] (At constant temperature and number of moles)
[tex]{P_1V_1}={P_2V_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas
[tex]P_2[/tex] = final pressure of gas
[tex]V_1[/tex] = initial volume of gas
[tex]V_2[/tex] = final volume of gas
Thus as volume of the container will be reduced, the pressure would increase.
Answer:
a. The pressure will increase.
Explanation:
Determine the percent yield for the reaction between 3.74 g of na and excess o2 if 5.34 g of na2o2 is recovered.
Answers
Chemical reaction: 2Na + O₂ → Na₂O₂.
m(Na) = 3,74 g.
n(Na) = m(Na) ÷ M(Na).
n(Na) = 3,74 g ÷ 23 g/mol.
n(Na) = 0,162 mol.
From chemical reaction: n(Na) : n(Na₂O₂) = 2 : 1.
n(Na₂O₂) = 0,162 mol ÷ 2 = 0,081 mol.
m(Na₂O₂) = 0,081 mol · 78 g/mol.
m(Na₂O₂) = 6,341 g.
yield of reaction = 5,34 g / 6,341 g · 100%.
yield of reaction = 84,2%.
The percentage yield for the reaction is 84.2%.
What is percent yield?Percent yield is the difference in the percent of theoretical yield to the percent of actual yield.
The reaction is
[tex]\rm2Na + O_2 = Na_2O_2[/tex]
Mass of Na = 3.74g
Calculating the moles of Na
[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\\\\Number\;of \;moles= \dfrac{3.74}{23}= 0.162 \;mol[/tex]
The ratio of mole of Na : (Na₂O₂) = 2:1
[tex]\rm Number\;of \;moles= \dfrac{0.162}{2}= 0.081 \;mol\\\\mass\;of Na_2O_3 = 0.081 \times 78\;g/mol\\\\mass\;of Na_2O_3 = 6.341\;g\\\\\\Yield \;of\;reaction = \dfrac{5.34g}{6.341g} \times 100 = 84.2\%[/tex]
Thus, the percent yield is 84.2%.
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The tiny particles that make up elements are called atoms.
True
False
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where the atom is the smallest (tiny) particle of an element, the atom may be neutral or ionized, and its size is around 100 picometers. The atom composed of a nucleus and one or more electrons (negative charge) bound to the nucleus, the nucleus contains protons (positive charge) and neutrons.
True The tiny particles that make up elements are called atoms
Does the nature of intermolecular forces change when a substance goes from a solid to a liquid or from liquid to gas?
Answers
For the endothermic reaction below, when does le chatelier's principle predict that there will be an increase in the number of moles of co2? caco3(s) ⇄ cao(s) + co2(g)
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When a neat, ordered chemical is changed into a more disordered chemical, there is an increase in what?
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Entropy refers to the degree of disorderliness in a reacting system. The degree of entropy is considered to be zero, when there is no disorderliness. The degree of entropy increases as the disorderliness increases.
Describe three ways that individuals can combat global warming.
Answers
CHEMISTRY HELP!
Which of the following best describes how an electron moves when it releases energy?
A. The electron is pulled into the nucleus.
B. The electron moves to a higher energy level.
C. The electron moves to a lower energy level.
D. The electron is pulled to another atom.
Answers
Final answer:
An electron releases energy by dropping to a lower energy level that is closer to the nucleus. So the correct option is C.
Explanation:
When an electron releases energy, it moves to an energy level that is closer to the atomic nucleus. The correct answer is C: The electron moves to a lower energy level. According to Bohr's Model, as electrons absorb energy, they are able to move to higher energy levels which are further from the nucleus. Conversely, when electrons release energy, they fall back to lower energy levels, which are closer to the nucleus. This is because electrons are attracted to the positive protons in the nucleus, and it takes energy to move them away from the nucleus. When they drop back to a lower energy level, they release energy, often in the form of light, as seen in atomic emission spectra.
The simplest structured unit of a compound is a(n):
a. electron
b. atom
c. proton
d. molecule
Answers
Of the choices below which one is not an ionic compound quizlwr
Answers
NC13 is a compound that is not an ionic compound.
Explanation:Of the compounds listed, the only one that is not an ionic compound is NC13. Ionic compounds are formed between a metal and a nonmetal, where electrons are transferred from the metal atom to the nonmetal atom. Covalent compounds, on the other hand, are formed between nonmetals, where electrons are shared between atoms. In this case, NC13 is covalent because it is composed of nitrogen (a nonmetal) and chlorine (also a nonmetal).