Each atom is left with a ______ outer shell?
The blue color in some fireworks occurs when copper chloride is heated to approximately
Can anyone Please do this for me???I am trying to help my son with his Chemistry and I don't understand it. I have read the text book and researched it on the internet, but I still can't figure it out and my son doesn't understand it either. I just need someone to explain to me what to do, not do it for him. This way he can still do the work. Thank You!
Researching Elements in the Periodic Table:
Directions
Overview:
The periodic table includes groups of elements that have unique and useful capabilities. Such capabilities are due to the properties of the elements—such as ionization energy, atomic radius, and boiling point.
For this assignment, you will choose one of the groups of representative elements 1A–7A in the periodic table to research, as well as one element within that group to research.
Use your textbook and the Internet to perform your research. Note: Your textbook contains information about elemental groups in the periodic table in Appendices A and B.
Procedure:
1. For each element in the group that you have chosen, organize the following information in a data table in Microsoft Excel: • Element name
• Element symbol
• Atomic number
• Atomic mass
• Melting point
• Boiling point
• Electronegativity value
• Atomic radius
• Ionic radius
• First ionization energy
2. Use Microsoft Excel to create a line graph of ionic radius (y-axis) versus atomic number (x-axis). Save your completed graph to your Desktop so that you can submit the file to your teacher for grading.
3. Use Microsoft Excel to create a line graph of first ionization energy (y-axis) versus atomic number (x-axis). Save your completed graph to your Desktop so that you can submit the file to your teacher for grading.
4. Type a one-to-two paragraph analysis of your graphs that addresses the following: • What is the relationship between the atomic numbers and ionic radii of the elements in the group?
• What is the relationship between atomic numbers and first ionization energies?
• Why do these relationships exist? Propose an explanation for each of these relationships.
• Are these relationships consistent with the periodic trends that you have been studying?
5. Choose one element from within the group that you have selected. Write a one-to-two paragraph description of the element that addresses the following: • What was the date of the element’s discovery?
• Which scientist or scientists discovered the element?
• Where was the element discovered?
• How was it discovered?
• Describe any unique properties of the element.
• Describe any uses or products that have developed from the discovery of the element.
Choosing Group 2A (alkaline earth metals) of the periodic table, and focusing on the element calcium (Ca).
The research:
Element: Calcium (Ca)
1. Data Table:
| Property | Value |
|-----------------------------------|------------------------|
| Element name | Calcium |
| Element symbol | Ca |
| Atomic number | 20 |
| Atomic mass | 40.08 u |
| Melting point | 842°C |
| Boiling point | 1484°C |
| Electronegativity | 1.00 |
| Atomic radius | 197 pm |
| Ionic radius | 100 pm (2+) |
| First ionization energy | 590.6 kJ/mol |
2. Graphs:
- Ionic Radius vs Atomic Number:
Graph of Ionic Radius (pm) on the y-axis and Atomic Number on the x-axis is attached below.
- First Ionization Energy vs Atomic Number:
Graph of First Ionization Energy (kJ/mol) on the y-axis and Atomic Number on the x-axis is attached below.
3. Analysis:
The graph of ionic radius versus atomic number for Group 2A elements will show a decreasing trend as atomic number increases.
This is because, as you move down the group, the number of electron shells increases, leading to a greater distance between the outer electrons and the nucleus, resulting in a larger ionic radius.
On the other hand, the graph of first ionization energy versus atomic number will show an increasing trend. This is because, as you move down the group, the outermost electrons are further away from the nucleus, experiencing weaker attractive forces, thus requiring more energy to remove them, resulting in higher ionization energies.
These relationships align with the periodic trends studied, where atomic size increases down a group, leading to decreasing ionization energy.
4. Description of Calcium:
- Date of Discovery: Calcium was discovered by Sir Humphry Davy in 1808.
- Discoverer: Sir Humphry Davy.
- Location of Discovery: It was discovered in England.
- Discovery Method: Davy electrolyzed a mixture of lime (calcium oxide) and mercuric oxide, yielding calcium amalgam, from which he isolated calcium by evaporating the mercury.
- Unique Properties: Calcium is a silvery-white, alkaline earth metal. It is essential for living organisms, playing a vital role in bones, teeth, and muscle function. It is also highly reactive with water, forming calcium hydroxide and hydrogen gas.
- Uses/Products: Calcium has various uses, including in the production of steel, as a deoxidizer, and in the production of calcium compounds used in agriculture, pharmaceuticals, and construction materials.
Fill in the coefficient that will balance the following reaction:
_____NH4Cl+_______Ag3PO4--->_____AgCl+_____(NH4)3PO4
What is the mass of 5.40×1021 platinum atoms?
The mass of 5.40 × 10^21 platinum atoms is approximately 1.75 grams. This is calculated using Avogadro's number and the molar mass of platinum.
Explanation:To calculate the mass of 5.40×1021 platinum atoms, first, we need to understand that the atomic mass of platinum is approximately 195.08 u (atomic mass units). In chemistry, one mole of any substance contains Avogadro's number (6.022 × 1023) of particles (atoms, molecules, ions, etc). Therefore, the molar mass of platinum is 195.08 g/mol, meaning that 1 mole of platinum atoms (6.022 × 1023 atoms) has a mass of 195.08 grams.
First, we find out how many moles 5.40×1021 platinum atoms constitute.
5.40 × 1021 atoms/ (6.022 × 1023 atoms/mol) = 0.00897 moles
Since the mass of 1 mole platinum is 195.08 g, therefore:
Mass = Moles × Molar mass = 0.00897 moles × 195.08 g/mol = 1.75 g
Therefore, the mass of 5.40 × 1021 platinum atoms is approximately 1.75 grams.
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The average kinetic energy of the particles in an object is directly proportional to its
a. heat.
b. volume.
c. temperature.
d. potential energy.
Answer: c) temperature
Explanation:
Kinetic energy is the energy possessed by an object by virtue of its motion.
Average kinetic energy is defined as the average of the kinetic energies of all the particles present in a system. It is determined by the equation:
[tex]K=\frac{3RT}{2}[/tex]
From above, it is visible that kinetic energy is directly related to the temperature of the system. So, if temperature is more, average kinetic energy of the system is more and vice-versa.
The cell theory was A. developed by Robert Hooke. B. developed before microscopes were invented. C. developed only after electron microscopes became widely used. D. developed by many scientists over many years.
Answer: D. Developed by many scientists over many years
Explanation: this is the correct answer
Which ions are spectator ions in the formation of a precipitate of agcl via combining aqueous solutions of cocl2 and agno3?
In the hydrocarbon (a) what is the hybridization at each carbon atom in the molecule? (b) how many s bonds are there in the molecule? (c) how many p bonds? (d) identify all the 120° bond angles in the molecule. [section 9.6]
Final answer:
In ethylene, both carbon atoms are sp2 hybridized and form a planar shape with 120° bond angles. In allene, the central carbon is sp hybridized with 180° bond angles, while the terminal carbons are sp2 hybridized with 120° bond angles, with hydrogen atoms at the central carbon in perpendicular planes.
Explanation:
Hybridization of Carbon Atoms in Hydrocarbons
When determining hybridization at carbon atoms within hydrocarbons such as ethylene (C2H4) or allene (H2C=C=CH2), we consider the number of atoms directly bonded to a carbon atom. In ethylene, both carbon atoms are sp2 hybridized because they each make three sigma (σ) bonds - two to hydrogen atoms and one to each other - and one pi (π) bond is shared between them, forming a double bond (C=C). As for allene, the central carbon is sp hybridized due to possessing two π bonds, one with each of the adjacent carbons, while the terminal carbon atoms are sp2 hybridized.
There are multiple types of bonds in a C=C bond; a σ bond and a π bond. A C=C bond includes one σ bond that results from the head-on overlap of sp2 hybrid orbitals and one π bond that results from the side-to-side overlap of the unhybridized p orbitals.
The shape of the ethene molecule is planar with approximately 120° bond angles due to the sp2 hybridization. In contrast, the allene molecule has a more complex structure where the central carbon has 180° bond angles, and the terminal carbons have 120° bond angles. The hydrogen atoms on the central carbon of allene are in perpendicular planes to each other due to the nature of its hybridization.
In a hydrocarbon, each carbon atom is sp3 hybridized, forming sigma bonds. There are no pi bonds, and all bond angles are approximately 109.5°, representing tetrahedral geometry.
(a) The hybridization at each carbon atom in a hydrocarbon can be determined using the formula "Hybridization = 1/2(V + M - C + A)," where V is the number of valence electrons, M is the number of monovalent atoms, C is the cation charge, and A is the anion charge. For carbon in a hydrocarbon, V = 4, M = 4, and C = A = 0 for neutral carbon. Substituting these values, the hybridization is 1/2(4 + 4 - 0 + 0) = 1/2(8) = 4. Therefore, each carbon atom in the hydrocarbon is sp3 hybridized.
(b) In a hydrocarbon, each bond formed between carbon atoms is a sigma (σ) bond. Thus, the number of sigma bonds is equal to the number of single bonds in the molecule.
(c) A hydrocarbon consists only of single bonds, so there are no pi (π) bonds.
(d) In a hydrocarbon, all the bond angles are approximately 109.5°, corresponding to the tetrahedral geometry of sp3 hybridized carbon atoms.
The question probable may be:
In the hydrocarbon (a) what is the hybridization at each carbon atom in the molecule? (b) how many s bonds are there in the molecule? (c) how many p bonds? (d) identify all the 120° bond angles in the molecule.
Which of the subatomic particles is most responsible for the chemical properties of an element?
Which two groups of organic compounds serve as energy sources?
Has anyone done the chemical reactions lab in chemistry on k12?? can someone help me do it
How do moss leaves and fish differ? How are they the same?
in a cell protein synthesis is the primary function of
What does it mean when substance are move against a concentration gradient?
Explain why water has a different boiling point at an elevation of 3000 meters than it does at sea level
Answer:
The lower the pressure the lower the temperature, thus, at 3000 m the pressure is lower, therefore the boiling temperature is lower than at 0 m.
Explanation:
Hello,
In this case, the boiling point of water at the sea level is about 100 °C whereas at 3000 m is about 89.5 °C since the pressure at higher altitudes is less than the atmospheric pressure. In such a way, considering a directly proportional relationship between pressure and temperature, the higher the pressure the higher temperature (sea level) whereas the lower the pressure the lower the temperature (at 3000 m)
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Kinetic energy differs from chemical energy in that
What does the subscript 2 indicate in the compound mgcl2?
How do atoms form a new substance?
A :By sharing electrons with each other
B: By losing neutrons to each other
C: By gaining electrons from each other
D: By losing electrons
Your answer is A. Let me know if you need anything else!
Magnesium and nitrogen react in a combination reaction to produce magnesium nitride: 3 mg + n2→ mg3n2 in a particular experiment, a 10.1-g sample of n2 reacts completely. the mass of mg consumed is ________ g.
The mass of Mg consumed is approximately 26.28 g.
The balanced chemical equation for the reaction between magnesium (Mg) and nitrogen ([tex]\rm N_2[/tex]) to produce magnesium nitride ([tex]\rm Mg_3N_2[/tex]) is:
[tex]\rm \[3 \text{Mg} + \text{N}_2 \rightarrow \text{Mg}_3\text{N}_2\][/tex]
Given:
Mass of [tex]\rm N_2[/tex] = 10.1 g
Molar mass of [tex]\rm N_2[/tex] = 28.02 g/mol (molar mass of nitrogen)
Using stoichiometry, we can determine the moles of [tex]\rm N_2[/tex]:
Moles of [tex]\rm N_2[/tex] = Mass / Molar mass = 10.1 g / 28.02 g/mol ≈ 0.3602 mol
From the balanced equation, we see that 3 moles of Mg react with 1 mole of [tex]\rm N_2[/tex] to produce 1 mole of [tex]\rm Mg_3N_2[/tex].
Therefore, the moles of Mg consumed are: Moles of Mg = 3 * Moles of [tex]\rm N_2[/tex] = 3 * 0.3602 mol = 1.0806 mol
The molar mass of Mg is 24.31 g/mol (molar mass of magnesium), so the mass of Mg consumed is:
Mass of Mg = Moles of Mg * Molar mass = 1.0806 mol * 24.31 g/mol ≈ 26.28 g
Therefore, the mass of Mg consumed is approximately 26.28 g.
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In this reaction, 3 mg of magnesium reacts with nitrogen gas to produce magnesium nitride. The mass of Mg consumed is 26.3 g.
Explanation:In the given reaction, 3 mg of magnesium reacts with nitrogen gas (N2) to produce magnesium nitride (Mg3N2). To determine the mass of Mg consumed, we need to calculate the molar mass of Mg and the molar ratio between Mg and N2. The molar mass of Mg is 24.31 g/mol. Since the balanced equation shows a 3:1 ratio between Mg and N2, we divide the mass of N2 (10.1 g) by the molar mass of N2 (28.01 g/mol) to get the moles of N2 and then multiply that by the molar ratio to find the moles of Mg consumed. Finally, we multiply the moles of Mg consumed by the molar mass of Mg to get the mass consumed.
Calculation:
Mass of N2 = 10.1 g
Molar mass of N2 = 28.01 g/mol
Moles of N2 = (mass of N2) / (molar mass of N2) = 10.1 g / 28.01 g/mol = 0.3608 mol
Moles of Mg consumed = (moles of N2) x (molar ratio) = 0.3608 mol x 3/1 = 1.0824 mol
Mass consumed = (moles of Mg consumed) x (molar mass of Mg) = 1.0824 mol x 24.31 g/mol = 26.3 g
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Photochemical smong result from the interaction of pollution in the presence of
When fe(no3)2(aq) and na2s(aq) are mixed, what is the black coloured precipitate that forms?
Final answer:
The black colored precipitate formed when Fe(NO3)2(aq) and Na2S(aq) are mixed is Iron(II) sulfide, represented by the compound FeS.
Explanation:
When Fe(NO3)2(aq) and Na2S(aq) are mixed, a precipitation reaction occurs. According to solubility rules, sulfides are generally insoluble, except for those of group 1 elements (like Na) and ammonium. Iron sulfide, which is not an exception to this rule, will precipitate as a solid. The black colored precipitate that forms is likely to be FeS (Iron(II) sulfide).
The relevant reaction can be represented by the ionic equation: Fe2+ (aq) + S2- (aq) → FeS (s), where the precipitate is the insoluble iron(II) sulfide.
While the information provided with the question includes several reactions and solubility examples, the key to answering this specific question is understanding the solubility of sulfides and that iron can form a black colored sulfide precipitate.
A solution of potassium (k2cro4) when added to a solution of lead(ii) acetate (pb(ch3coo)2 produces a yellow precipitate of lead(ii) chromate. what type of reaction is it?
The given reaction is an example of a double displacement reaction, specifically a precipitation reaction, where the potassium and lead ions swap positions resulting in the formation of lead(II) chromate precipitate.
Explanation:The given reaction, whereby a solution of potassium (K2CrO4) is added to a solution of lead(II) acetate (Pb(CH3COO)2) resulting in the formation of a yellow precipitate of lead(II) chromate (PbCrO4), is an example of a double displacement reaction, also known as a precipitation reaction. In double displacement reactions, the cations and anions in two different compounds switch places, leading to the formation of a new compound(s). In this case, the potassium and lead ions swap their positions resulting in the formation of lead(II) chromate precipitate.
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How many lone pairs of electrons are in the electron-dot structure of h2o?
The reaction pcl3(g)+cl2(g)←−→pcl5(g) has kp=0.0870 at 300 ∘c. a flask is charged with 0.50atmpcl3, 0.50atmcl2, and 0.20atmpcl5 at this temperature. part a use the reaction quotient to determine the direction the reaction must proceed in order to reach equilibrium.
Given, equilibrium constant Kp = 0.0870
Pressure of PCl₃ = 0.50 atm
Pressure of Cl₂ = 0.50 atm
Pressure of PCl₅ = 0.20 atm
Reaction quotient, Q = [tex]\frac{0.20 atm}{0.50 atm x 0.50 atm}[/tex]
Q = 0.8
Q > K, net reaction is to the left
Q= K, no net reaction
Q < K, net reaction is to the right
Q = 0.8 and Kp = 0.0870
Q is greater than K, so the net reaction is to the left or to the reactant side.
Therefore, the reaction must proceed to the left or to the reactant side in order to reach equilibrium.
Gallionella bacteria can get energy from the reaction fe2+ → fe3+. this reaction is an example of
Imagine you have dissolved a small amount of baking soda in a glass of water. Identify the solute and the solvent
The bond between oppositely charged ions is a(n) ______ bond.
a.ionic
b.polar
c.hydrogen
d.covalent
As element of group 1 on the periodic table are considered in order of increasing atomic radius, the ionization energy of each successive element generally, A. Decreases B. Remains the same C. Increases
Answer:
The ionization energy of each successive element generally decreases
Explanation:
The ionization energy increases in the periods of the periodic table and decreases in the groups. If the atom is very small, we will need a lot of energy to release the electron, while if the atom is larger the energy will be greater.
As the atomic radius increases, the ionization energy of the elements ; ( A )
DecreasesAs we move across the periods in the periodic table ,the ionization energy of the elements increases relatively, while as we go down the Groups in the periodic table the atomic radius increases while the ionization energy decreases as well.
Therefore the elements of group 1 on the periodic table will experience a decrease in ionization energy as we go down the group.
Hence we can conclude that as the atomic radius increases, the ionization energy of the elements will decreases.
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Question 3 options: how many moles of argon atoms are present in 11.2 l of argon gas at stp?
It is known that at if a gas is identified to be as ideal gas then, at STP, the volume of 1 mole of that gas is equal to 22.4 L. Using this fact and the given volume in this item, we determine the number of moles as that below.
n = (11.2 L of argon)(1 mol argon / 22.4 L of argon)
n = 0.5 moles
Answer: 0.5 moles