Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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identifying types of reactions by matter balance each of the following …
1. Balanced equation: $\boldsymbol{2NaBr + Ca(OH)_2 = CaBr_2 + 2NaOH}$, Reaction Type: Double - Displacement 2. Balanced equation: $\boldsymbol{2NH_3 + H_2SO_4=(NH_4)_2SO_4}$, Rea…
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name: ally m. chemistry semester 1 review sheet the purpose of this rev…
1. Protons: +1 charge; Electrons: -1 charge; Neutrons: 0 charge. 2. Protons: 50, Neutrons: 69, Electrons: 50. 3. Atomic structure: Nucleus (protons + neutrons) and electrons in or…
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select the correct answer. in a redox reaction, why does an element’s o…
B. An element’s oxidation number increases because it lost electrons.
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allen is carrying out reactions in a lab. one of the products in all re…
E. They are all double - replacement reactions.
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select the correct answer. what occurs when there are oh⁻ ions in a sol…
C. a slippery feeling
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an unknown metal displaces cadmium (cd) from solution but does not disp…
C. iron (Fe)
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the average atomic mass of oxygen is 15.9994 amu. the atomic masses of …
A. O - 16
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select the correct answer. what is the formula of sulfurous acid? a. h₂…
D. \(H_2SO_3\)
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select the correct answer. which is the next logical step in balancing …
C. Place the coefficient 2 in front of elemental iron.
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given a chemical reaction, methane (ch₄) burns in oxygen (o₂) to produc…
A. $\ce{CH_{4} + O_{2} ightarrow CO_{2} + H_{2}O}$
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given the data in the table, what is the average atomic mass of chlorin…
B. 35.453 amu
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select the correct answer. which is a balanced chemical equation? a. $c…
B. \( C_7H_{16} + 11O_2 ightarrow 7CO_2 + 8H_2O \)
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the table below shows the amount of grams of iodine-125 left after seve…
\( 0.99 \)
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part a now, using your periodic table as a reference, type the symbols …
The table can be filled with element symbols as per their group (1, 2, 11, 14, 17, 18) and period. For example, Group 1 (1A) - Period 1: H, Period 2: Li, Period 3: Na, Period 4: K…
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select the correct answer. thallium consists of 29.5%tl-203 and 70.5%tl…
E. 204.4 amu
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21. what is the difference in reactivity between group 17 and group 18?…
Group 17 elements are highly reactive, while Group 18 elements (noble gases) are generally unreactive. Group 17 elements have 7 valence electrons and tend to gain 1 electron to ac…
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select the correct answer. thallium consists of 29.5%tl-203 and 70.5%tl…
E. 204.4 amu
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consider four elements from group 17: fluorine in the second period, ch…
A. fluorine
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select the correct answer. which option describes a similarity and a di…
C. same atomic number; different mass number
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select the correct answer. which element has the electron configuration…
C. lead (atomic number 82)
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select the correct answer. consider a mixture of soil and water and com…
D. Soil and water is a suspension because it consists of larger particles suspended in the medium, which start to settle when allowed to stand. Milk is a colloid because it consis…
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select the correct answer. which of these pairs of elements have the sa…
C. carbon (C) and lead (Pb)
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oxygen is composed of only one kind of atom and cant be separated into …
B. element
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which is a chemical property of vinegar? a. the ph of vinegar is around…
A. The pH of vinegar is around 2.4.
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10. ¿qué elemento se encuentra en el periodo 4 y grupo 6, de la tabla p…
Chromium (Cr) (or in Spanish: Cromio (Cr))
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9 when you put ice in a glass of water and put the glass in the refrige…
The ice will freeze (or the water will freeze more, and the ice may grow as the water freezes); this is a physical change.
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8 select the correct answer hasan is a digital marketing manager for a …
A. YouTube
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science midterm exam study guide matter part i: pure substances and mix…
s: ### Question 1: a. Mixture b. Pure substance c. Mixture d. Pure substance e. Pure substance (or Mixture? Wait, re - checking: The statement "Cannot be chemically combined" - if…
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7 la production du sel de table pourrait se faire selon l’équation ther…
Approximately \(12300\space kJ\) (or more precisely, using exact moles: \( \frac{4111.2}{2} \times \frac{350}{58.44} ≈ \frac{4111.2 \times 350}{2 \times 58.44} ≈ \frac{1,438,920}{…
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3. using the heat capacity of the calorimeter (a.k.a. the cup) calculat…
(The answers depend on the actual values of mass, heat capacity, molar mass. But following the steps: - Sub - question 4: Calculate \(q_{surroundings}=q_{water}+q_{cup}\) using \(…
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la production de sel de table pourrait se faire selon léquation thermoc…
Approximately \(\boldsymbol{2740\space kJ}\) (or more precisely, \(2743\space kJ\)) of energy is produced.
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based on the temperature change of your water, was heat gained or lost …
The heat released as the solid dissolved is approximately \(\boldsymbol{- 686\space J}\) (or more precisely \(- 686.18\space J\)).
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le carbonate de magnésium (mgco₃) est souvent utilisé comme anti-transp…
5 mol
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5 à partir de dichlorure déthylène (clch₂ch₂cl) chauffé et mis sous pre…
The reaction is endothermic. ### Part (b)
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6. which of the following statements is true about ballads? ballads are…
B. Many ballads tell the story of a tragedy or catastrophe.
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1. read the following verse from a famous sonnet by john donne. death, …
B. abba (assuming the second option is labeled as B, as per the options: first option abbb, second abba, third aaab, fourth abab)
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comprehension discuss these questions in pairs, and write the answers i…
1. consumers (for the first sentence. For other sentences, we would need the full list of words from page 1, but based on the given sentence, "consumers" is the match for the firs…
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a metal bar weighs 8.15 ounces. 93% of the bar is silver. how many ounc…
7.5795 ounces
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which statements about william shakespeare’s sonnets are true? select f…
A. They have a fixed rhyme scheme and structure, C. They often present a question and an answer, D. They often present a problem and a solution, F. They frequently focus upon love…
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4. the equilibrium constant for the following reaction below at constan…
\( Q_{eq}=1.28 \), reaction proceeds forward (toward \( \ce{SO_3} \) formation).
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comprehension discuss these questions in pairs, and write the answers i…
1. consumers 2. baked 3. misleading 4. overwhelming 5. serving size 6. low - salt (or sodium - related term) 7. exempt 8. preservatives (Note: The exact words depend on the vocabu…
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structure and composition of the atmosphere quiz complete 5 which phras…
equals mass divided by volume
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which gas in earth’s atmosphere forms ozone? oxygen nitrogen water vapo…
A. oxygen
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who is the \criminal\? (the three boxes left unchecked will reveal the …
Mr. Chem (with last known whereabouts in the Kitchen and crime method Chemical Poisoning) is the criminal.
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who is the \criminal\? (the three boxes left unchecked will reveal the …
The criminal is Mr Chem, at Kitchen, with Chemical Poisoning (Player: Mr Chem, Whereabouts: Kitchen, Method: Chemical Poisoning)
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3. atomic number also gives the ______ or identity of an atom.
element
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atomic number 1. define atomic number:
The atomic number is the number of protons in the nucleus of an atom of an element, which determines the element's identity and its position in the periodic table.
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7. write extended response: \the cremation of sam mcgee\ is a study in …
The poem uses a playful AABB rhyme scheme and short, narrative stanzas (structure) to create a light - hearted rhythm, contrasting the grim subject. Poetic elements like vivid ima…
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electrons: number under the nom say no same. 12. mass number: element n…
Mass Number: $\boldsymbol{190}$ Element Name: $\boldsymbol{\text{Osmium}}$ Element Symbol: $\boldsymbol{\text{Os}}$
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question 3 (multiple choice worth 2 points) (02.01hr lc1) select the mi…
The option with the image of rice (the selected one with the blue dot) is the correct choice for "Select the mixture of solids".
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2 which term best describes how our solar system formed? a gradually b …
A. Gradually
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when thermal energy is added to a substance, what typically happens to …
The particles move faster and have more kinetic energy. ### Second Question (Water Molecules During Freezing)
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electrons: 13. p: 56 n: 81 mass number: element name: element symbol:
Mass Number: $\boldsymbol{137}$ Element Name: Barium Element Symbol: $\boldsymbol{Ba}$
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which process describes the change of a substance directly from a gas t…
B. Deposition
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question 4 (multiple choice worth 2 points) (02.01r (c)) identify the o…
C. Particle size, shape, color, texture, and magnetism
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describe the best method for separating a mixture of sand, salt, and st…
The correct order of the steps is: 1. Pass a magnet over the mixture to remove the steel. 2. Add water to the sand/salt mixture and stir to dissolve the salt. 3. Pour the mixture …
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to separate a mixture of hard candies and marbles, the most efficient m…
passing the mixture through a sieve
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to separate a mixture of hard candies and marbles, the most efficient m…
passing a magnet through the mixture
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to separate a mixture of hard candies and marbles, the most efficient m…
sorting the mixture by hand
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figure p (chemical structure with br and naoc(o)ch₃, reaction arrow)
The product of the reaction is pentyl acetate (or 1 - pentyl acetate), with the chemical formula $\ce{CH3(CH2)4OC(O)CH3}$ (or structural formula showing the pentyl group attached …
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soda is a mixture. the ingredients list for a can of soda is given belo…
The option: They are not chemically bonded to each other.
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choose the words to finish the sentences. the image shows the direction…
First blank: system Second blank: greater than
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a number of substances and their chemical formulas are listed below. ch…
The substances that are compounds are: - carbon monoxide (CO) - glucose ($\ce{C6H12O6}$)
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which of these are examples of physical changes? check all that apply. …
- freezing water - cutting paper - mixing water and acetone
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choose the correct description for each of the properties below: dropdo…
- density: physical property - flammability: chemical property - solubility in water: physical property - reactivity with water: chemical property - melting point: physical proper…
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identify the items in the list below that are examples of matter. check…
The items that are examples of matter are: - iron (has mass and occupies space) - sugar (has mass and occupies space) - glass (has mass and occupies space) - neon gas (has mass an…
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periodic table and periodic trends worksheet 1. what are two names of a…
Two names of a row in the periodic table are: Period, Series ### Question 2
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using the information in the table to the right, calculate the average …
87.62
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boron has an average atomic mass of 10.81. one isotope of boron has a m…
11.01
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87 how many cl atoms are in 3cacl₂? a. 3 b. 6 c. 9 d. 12 88. which reac…
B. 6 ### Question 88: Which reaction is decomposition?
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calculate the average atomic mass of carbon if 98.90% of the atoms are …
12.01
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1 multiple choice 1 point in order to generate snow, there has to be mo…
A. Physical Change ### Question 2
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73. a + bc → ac + b is what type? a. synthesis b. decomposition c. sing…
C. Single replacement ### Question 74: \( AB + CD ightarrow AD + CB \) is what type?
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use the periodic table to determine which of the following could be an …
- \( Z = 49, A = 113 \) - \( N = 64, Z = 49 \)
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use the periodic table to determine which of the following could be an …
- \(Z = 35, A = 79\) - \(A = 79, N = 44\)
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58. why are tracers used in medicine? a. to block radiation b. to track…
B. To track organs ### Question 59: Nuclear energy is powerful because —
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28. what holds ions together in an ionic bond? a. neutron attraction b.…
C. Opposite charges ### Question 29
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number of protons, number of neutrons, atomic number, mass number, elem…
A: 8 B: 8 C: O D: 26 E: 30 F: Fe (Note: For C, if we recheck: Atomic Number 8 is Oxygen, but mass number 15 (8p +7n) is an isotope of Oxygen (O-15). For F, Atomic Number 26 is Iro…
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number of protons 20 9 number of neutrons 20 d atomic number a e mass n…
A: 20 B: 40 C: Ca D: 10 E: 9 F: F
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14. which element would most likely form +2 ions? a. sodium b. magnesiu…
B. Magnesium ### Question 15
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how many electrons are in an atom of elemental sodium? equal to the num…
equal to the number of protons
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atomic structure & periodic table (1–25) 1. a neutral atom has 14 proto…
C. 14 ### Question 2
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background antoine lavoisier was a french chemist who did most of his w…
Magnesium: 48.6 g; Oxygen: 32.0 g ### Part (1b)
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compound type: ionic or covalent? compound formula compound name ionic …
The main errors are: 1. Sodium ion notation in \( \text{NaBr} \) formation: should be \( \text{Na}^+ \) not \( \text{Na}^{++} \). 2. Name of \( \text{N}_2\text{S} \): should be di…
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a scientist is measuring the temperature of a chemical undergoing a rea…
The form \( y = 4x^2 - 32x + 60 \) (the first option) is most useful.
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use the drop-down menus to describe the charges of the subatomic partic…
1. Protons have a $\boldsymbol{\text{positive}}$ charge. 2. $\boldsymbol{\text{Neutrons}}$ have a 0 charge. 3. Electrons have a $\boldsymbol{\text{negative}}$ charge.
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part b: short answer and calculations (thinking and inquiry and applica…
The graph has time on the x - axis and concentration on the y - axis. Initial equilibrium at \( t_1 \) (horizontal lines for all concentrations), addition of \( A \) at \( t_2 \) …
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what are the properties of the aluminum in the can? check all that appl…
- It conducts electricity well. - It is solid. - It does not react easily with water or air.
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question 9 of 10 learning to think critically and explaining your answe…
C. cognitive; moral
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question 2 of 10 you thought you hated thai food, but when you tried it…
C. accommodation.
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potential energy energy that is stored inside of an object due to its p…
### Chemical Potential Energy Examples: Batteries, food (like a candy bar), gasoline (stored chemical energy for fuel). ### Elastic Potential Energy Examples: Stretched rubber ban…
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part 2 — questions: 1. a scholar claims, \the atomic radius is the dist…
The scholar is not correct. The atomic radius is the distance from the nucleus of an atom to the region where the outermost electrons are most likely to be found (due to the elect…
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. writing formulas from names before you begin, do the following: #1 ci…
### Part 1 (Circling Covalent Compounds) Circled numbers: 4 (dinitrogen pentaoxide), 5 (carbon tetrahydride), 6 (dihydrogen monoxide) ### Part 2 (Formulas) 1. Lithium oxide: $\bol…
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9. what property allows water to form hydrogen bonds? (1 point) ionic b…
C. polarity ### Question 10
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5. what law creates the hydrogen bond? (1 point) opposites attract oppo…
A. Opposites Attract ### Question 6
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mixed nomenclature - both ionic and covalent i. writing names from comp…
1. Cloruro de sodio 2. Bromuro de potasio 3. Flúoruro de calcio 4. Dióxido de nitrógeno 5. Monóxido de carbono 6. Etano 7. Óxido de aluminio 8. Pentóxido de difósforo (Nota: Para …
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brief an ele configuration con 1. a number indicates the 2. a letter in…
The ground - state electron configuration of Na is \(1s^{2}2s^{2}2p^{6}3s^{1}\)
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counting workshi 1. record the number of each atom in each molecule, th…
Para \( 4\text{Li}_2\text{O} \): - Li: 8 - O: 4 - Total: 12
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#4 - chemical systems and equilibrium (part 1) question 8 (1 point) if …
False ### Question 9
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counting atoms worksheet 1. record the number of each atom in each mole…
5) | Element | # of Atoms | |---------|------------| | N | 5 | | H | 20 | | Cl | 5 | | Total | 30 | 6) | Element | # of Atoms | |---------|------------| | Ca | 1 | | Cl | 1 | | O …