A system used to represent the valence electrons around the chemical symbol of an element is the
Answer:
Lewis Dot Diagram
Explanation:
How do the first ionization energies of main group elements vary across a period and down a group?
(true or false) the electron structure of an atom is determined by direct observation using x-rays.
The answer is false. It is because the electron structure of the atom is not determined by using the direct observation of using an x-ray but rather the usage of theoretical modeling and the emission spectra will be useful in observing.
Which substance has polar covalent bonds? which substance has polar covalent bonds? n2 bao f2 so2?
Fluorine and Nitrogen are both non-metals which posses non polar covalent bonds. BaO on the other hand is a combination of a metal (Ba) and non metal (O) hence making it an ionic bond. So in this case, only SO2 has polar covalent bond.
Answer:
SO2
Sulfur dioxide (SO2) is a substance with polar covalent bonds among the given options. It has atoms with different electronegativities, hence the unequal sharing of electrons. SO2's bent molecular shape also contributes to its overall polarity.
Explanation:The substance with polar covalent bonds among N2, BaO, F2, and SO2 is SO2 (sulfur dioxide). Polar covalent bonds occur when there is an unequal sharing of electrons between atoms with different electronegativities.
Nitrogen (N2) and Fluorine (F2) are both diatomic molecules of the same element and thus have nonpolar covalent bonds because they share electrons equally. Barium oxide (BaO) is an ionic compound because it is composed of a metal and a nonmetal.
Sulfur dioxide (SO2), on the other hand, has atoms with different electronegativities which leads to an unequal sharing of electrons and the formation of polar covalent bonds. The molecule is also bent in shape, which contributes to its overall polarity.
a hamster weighs less then a (n) ?
What does conserving mass mean in a chemical equation?
Conserving mass in a chemical reaction means the atoms of each type should be the same on both the reactant and the product side.
Further explanation:
Balanced chemical reaction:
The chemical reaction that contains an equal number of atoms of the different elements in the reactant as well as in the product side is known as a balanced chemical reaction. The chemical equation is required to be balanced to follow the Law of conservation of mass.
Law of conservation of mass:
According to this law, the mass of an isolated system can neither be created nor be destroyed in any chemical reaction. The mass of reactants and the products should be equal in accordance with this law. In other words, the number of atoms of each type should be same on both sides of the chemical reaction. The reactant is the substance that undergoes a change in itself in a chemical reaction whereas the product is the one that is formed as a result of the chemical reaction.
For example, the balanced chemical reaction between [tex]{{\text{P}}_{\text{4}}}[/tex] and [tex]{\text{C}}{{\text{l}}_{\text{2}}}[/tex] occurs as follows:
[tex]{{\text{P}}_4} + 10{\text{C}}{{\text{l}}_2} \to 4{\text{PC}}{{\text{l}}_5}[/tex]
Here,
[tex]{{\text{P}}_{\text{4}}}[/tex] and [tex]{\text{C}}{{\text{l}}_{\text{2}}}[/tex] are the reactants.
[tex]{\text{PC}}{{\text{l}}_5}[/tex] is the product.
In the above reaction, the number of potassium atoms on both reactant and product side is 4 while the number of chlorine atoms on both sides is 20. So Law of conservation of mass is followed.
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Answer details:
Grade: High School
Subject: Chemistry
Chapter: Basic concepts of chemistry
Keywords: balanced chemical reaction, law of conservation of mass, reactant, product, P4, Cl2, PCl5, 10 Cl2, 4 PCl5, atoms, same.
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________ processes such as evaporation and chemical activity can precipitate chemical sediments.
Is adding hot cocoa to hot water a chemical or physical change?
Adding hot cocoa to water is a physical change because it involves combining substances without changing their chemical compositions.
Adding hot cocoa to hot water is considered a physical change. When you mix hot cocoa powder with hot water, the hot cocoa dissolves and the two substances combine, but this process does not result in new chemical substances being formed. Just like other physical changes such as the melting of ice or the dissolving of sugar in water, the composition of the resulting mixture is still a combination of water and cocoa particles.
In contrast, a chemical change involves a substance transforming into a new substance with a different chemical composition, as exemplified by iron rusting (Fe + O₂ → Fe₂O₃) or the burning of gasoline.
What product of the krebs cycle is considered a waste product of the reaction?
Use quantum numbers to represent the locations of electrons.
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Giving out 16 pts for this Question being Answer in the next Couple of Hours before its 4:15 P.M Tomorrow for My Oral Discussion with my Teacher.
What caused the deflection of the alpha particles in rutherford's gold foil experiment?
The deflection of alpha particles in Rutherford's gold foil experiment was caused by the presence of a dense, positively charged nucleus within the atom that repelled the positively charged alpha particles.
Explanation:The deflection of the alpha particles in Rutherford's gold foil experiment is attributed to the presence of a dense, positively charged center or 'nucleus' in the atoms. Alpha particles, which are helium atoms that have lost their electrons and are therefore positively charged, were fired at a thin piece of gold foil. The majority of these alpha particles passed through the gold foil, suggesting that the atoms consist mostly of empty space.
However, a small fraction of the alpha particles were significantly deflected or even completely reversed direction. This indicates that these particles encountered a highly concentrated positive charge (the nucleus of the atom) that repelled the like-charged alpha particles. This deflection allowed Rutherford to deduce the presence of a small, dense nucleus within the atom, contradicting the then-established 'plum pudding' model of atom structure.
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true or false elements in the same colum have simular properties
Answer: true because they have similar chemical properties
Explanation:
Because Elements present in the same group have the same number of valence electrons.
Which nuclei are most useful for organic structure determination using nmr spectroscopy? (select all that apply.)?
at what temperature would 250mL of water boils? 1000mL? is the boiling point an intensive or extensive property? explain.
Answer:
Boiling point of water = 100 C. It is an intensive property.
Explanation:
Properties of matter can be broadly classified into two categories:
1) Chemical
2) Physical
Physical properties can be further classified as intensive and extensive properties
Intensive properties are properties that do not depend on the amount of matter. For example: Temperature, color, boiling point, melting point
Extensive properties are properties that depend on the amount of matter. For example: Volume, mass, length
Water boils at a temperature of 100 C; this value is a constant irrespective of the volume (amount) of water. Hence boiling point is an intensive property.
The relative atomic mass of an atom can be found by comparing the mass of the atom to the mass of
The relative atomic mass of an atom is found out by comparing the mass of the atom to the mass of an atom of carbon-12.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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Which one of the quantum numbers does not result from the solution of the schrodinger equation?
Which type of observation involves exact measurement, quantitative or qualitative?
Answer:
1. Quantitative
2. Qualitative
3. Qualitative
Explanation:
Which example is a density independent factor? A. rainfall B. available food C. number of possible mates D. nesting space
Which regions on the periodic table can adopt positive and negative oxidation numbers?
The region(s) of the periodic table which are made up of elements that can adopt both positive and negative oxidation numbers are the “non-metal” region. As we can see on the periodic table, the elements situated at the right side of the table have two oxidation states, one positive and the other a negative.
What chemical property is most commonly used to classify igneous rocks?
Actually Igneous rocks are classified either based on grain size or based on mineralogy. However grain size is clearly not a chemical property. So we can say that they are classified chemically based on mineralogy or the abundance of quartz or silica present.
The reaction nacl(s) → nacl(aq) is performed in a coffee cup calorimeter, using 100 ml of h2o(l) and 5.00g of nacl. if the temperature of solution after mixing decreased by 2.30°c, what is the δhrxn in kj/mol? assume the heat capacities of all solutions are 4.18 j/g°c, and densities of all solutions are 1.00 g/ml. the molar mass of nacl is 58.44 g/mol
Since the density of water is 1 g /mL, hence there is 100 g of H2O. So total mass is:
m = 100 g + 5 g = 105 g
=> The heat of reaction can be calculated using the formula:
δhrxn = m C ΔT
where m is mass, C is heap capacity and ΔT is change in temperature = negative since there is a decrease
δhrxn = 105 g * 4.18 J/g°C * (-2.30°C)
δhrxn = -1,009.47 J
=> However this is still in units of J, so calculate the number of moles of NaCl.
moles NaCl = 5 g / (58.44 g / mol)
moles NaCl = 0.0856 mol
=> So the heat of reaction per mole is:
δhrxn = -1,009.47 J / 0.0856 mol
δhrxn = -11,798.69 J/mol = -11.8 kJ/mol
What are the details if the albany plan and what are ben franklins goal?
What is the process by which molecules of water vapor in the air become liquid water?
What is the ph of a solution with hydrogen ion concentration of 0.001m?
What are the general properties of the elements in the group to the right in the modern periodic table?
The general properties of the elements to the right in the modern periodic table are low melting and boiling point, high ionization energy, high electron affinity, poor conductor, and lack of metallic luster.
What are nonmetals?The elements present on the right-hand side of the modern periodic table are nonmetals. Nonmetals are the elements that form negative ions by gaining electrons and have 4, 5, 6, or 7 electrons in their outermost shell.
Non-metals lack all metallic attributes and are good insulators of heat and electricity. They are generally gases at room temperature and sometimes liquid.
Nonmetals are high ionization energies and high electronegativity so they gain electrons when reacting with other compounds, to form covalent bonds.
Nonmetals have high electronegativities so they have a strong tendency to attract electrons. Nonmetals exist as liquids or gases therefore, they have low melting and boiling points under normal conditions.
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A student cleaned a crucible with hcl. after pouring the hcl into the waste container, the crucible was neither rinsed with water nor dried before the student added the nahco3-nacl mixture. the crucible contained some residual hcl. how would this affect the calculated percentage of nahco3 in the mixture
Presence of residual HCl will react with [tex]NaHCO_3[/tex], reducing its amount and thus lower the calculated percentage of [tex]NaHCO_3[/tex] in the mixture.
If a student cleaned a crucible with HCl and then added a [tex]NaHCO_3[/tex]-NaCl mixture without rinsing or drying it, this would affect the calculated percentage of [tex]NaHCO_3[/tex] in the mixture due to the reaction between the residual HCl and [tex]NaHCO_3[/tex]. Specifically, HCl is an acid which would react with [tex]NaHCO_3[/tex], a base, to produce NaCl, [tex]CO_2[/tex], and [tex]H_2O[/tex].
[tex]NaHCO_3[/tex] (s) + HCl (aq) → NaCl (aq) + [tex]CO_2[/tex] (g) + [tex]H_2O[/tex] (l)
This reaction would decrease the amount of [tex]NaHCO_3[/tex] in the crucible, leading to a lower calculated percentage of [tex]NaHCO_3[/tex] in the mixture than actually present. This is because the [tex]CO_2[/tex] produced escapes as a gas, reducing the mass that is attributed to [tex]NaHCO_3[/tex].
For an electron in an atom to change from the ground state to an excited state, energy must be
For an electron to move from its zero or ground state to an excited state of higher energy level, of course it has to absorb energy.
Just like a person, energy must be supplied so that the person will be lively or active.
Answer:
energy must be absorbed
An electron absorb energy when change from ground state to excited state.
If an electron in an atom change from the ground state to an excited state, it must be absorb energy because with the help that energy it can move against the force of attraction of nucleus of that atom.
This energy provided to electron in order to remove the electron from outermost shell of that atom. If the electron release the energy then it comes back to its original position so we can conclude that electron absorb energy when change from ground state to excited state.
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Why are tin granules used instead of just a piece of tin?
The reason why Tin granules is mostly used or preferred than just a piece of Tin because a piece of Tin is plainly metal, in which this will be difficult in having it to be oxidized when it is exposed or in the air rather than Tin granules.
Answer:
To increase the surface area of reaction.
Explanation:
The tiny granules are used as they increase the surface-area to volume ratio. Smaller granules have a higher surface area to volume ratio. In a chemical reaction, it means that the reaction increases as there is more particle to particle reaction.
Hence the granules are preferred to solids.
How many atoms are in 3.08 mol of pure aluminum?
To determine the number of atoms in 3.08 mol of pure aluminum, multiply the number of moles by Avogadro's number.
In order to determine the number of atoms in 3.08 mol of pure aluminum, we need to use Avogadro's number. Avogadro's number is a fundamental constant in chemistry that represents the number of atoms or molecules in one mole of a substance. It is approximately equal to 6.022 × 10²³ atoms/mol.
To find the number of atoms in 3.08 mol of pure aluminum, you can use the following calculation:
Multiply the number of moles (3.08 mol) by Avogadro's number (6.022 × 10^23 atoms/mol):Number of atoms = 3.08 mol × (6.022 × 10²³ atoms/mol)
By performing this calculation, you will find the number of atoms in 3.08 mol of pure aluminum.
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