Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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write the charge of each ion in the compound below. nahco3 na = +1 hco3…
Sodium hydrogen carbonate
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write the charge of each ion in the compound below. nahco3 na = hco3 = …
\(Na = +1\), \(HCO_3=-1\), Name: sodium bicarbonate
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1. the two flasks below have an even volume of water in each. in the fi…
The second flask is more acidic because it has a higher concentration of \(H^+\) ions (10 \(H^+\) atoms compared to 3 \(H^+\) atoms in the first flask). For the second question (a…
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write the charge of each ion in the compound below. sr(no3)2 sr = □ no3…
\(Sr = + 2\), \(NO_3=-1\), Name: strontium nitrate
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which pair of atoms is most likely bonded together in a molecule that h…
B. C and O
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a student states that nonmetal atoms form covalent bonds by gaining ele…
B. Covalent bonds form when atoms share electrons.
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given their electronegativity values, which pair of atoms could form a …
A. O (3.5) and Cl (3.0)
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what does the ph scale measure? concentration of salts temperature of a…
- First question: Concentration of hydrogen ions - Second question: A solution that resists changes in pH
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write the charge of each ion in the compound below. nh₄cl nh₄ = □ cl = …
$\text{NH}_4 = + 1$; $\text{Cl}=-1$
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1pt what bonds might form in a carbon atom with sp2 hybrid orbitals? a.…
B. a double bond and two single bonds
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write the charge of each ion in the compound below. calcium phosphate c…
Calcium = $+2$; Phosphate = $-3$; Formula = $Ca_{3}(PO_{4})_{2}$
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what paper can be used to test ph? filter litmus computer microscopy bu…
1. B. litmus 2. C. homeostasis
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1pt how many electrons are shared when two atoms form a triple bond? a.…
C. 6
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36. which of the following diagrams is the correct lewis dot structure …
C. \(H - C\equiv C - H\)
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which of the following would most effectively resist a ph change when s…
- First question: Buffer solution - Second question: Blood
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30. which of the following substances would you expect to have a low me…
C. carbon dioxide
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what is the primary purpose of using ph paper over litmus paper? to det…
- First question: To obtain a precise pH value - Second question: pH meter
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what type of compound is composed of covalently bonded atoms and has a …
A. complex molecular compound
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1pt how does a coordinate covalent bond differ from a standard covalent…
B. in the source of the electrons shared
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identify all of the items that represent an element and not a molecule.…
Li, Ne, H
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polyatomic ions worksheet exercise 4. provide the name for each compoun…
- CuCN: Copper(I) cyanide - FeO: Iron(II) oxide - ZnO: Zinc oxide - Al₂O₃: Aluminum oxide - AgCl: Silver chloride - NH₄NO₃: Ammonium nitrate - NaNO₃: Sodium nitrate - NaNO₂: Sodiu…
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which type of paper is used to determine if a solution is acidic or bas…
- First question: Litmus paper - Second question: They release hydrogen ions (\(H^{+}\)) in solution
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storyline 1 exam 41 of 73 which of the following statements about the s…
- The actual attraction felt by the electrons farthest from the nucleus is less than the numerical value based on Coulomb's law. - The effective nuclear charge \(Z_{eff}\) is defi…
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the diagram shows the electron configuration around the chlorine nucleu…
7; 7+
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in this performance task, you will answer 4 questions. the united natio…
Nh
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what happens to the ph of an acidic solution when a base is added? the …
- First question: The pH increases - Second question: Baking soda solution
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how are the elements in todays modern periodic table arranged? in order…
in order of increasing atomic number
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which ph value would indicate a strongly basic solution? 13 1 7 5 clear…
1. 13 2. Acidic
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which of the following statements about metals are true? select all tha…
- Metals can be hammered into different shapes. - Metals in solid form have specific crystal structures. - Metals can be drawn into wires.
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read the passage and answer the next two questions. during a classroom …
It has two valence electrons; It belongs to the third period.
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a solution with a ph of 3 is considered to be: basic strongly acidic ne…
1. Strongly acidic 2. Basic
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select the statement that accurately explains why an atom is left with …
There are more positively charged subatomic particles in the atom’s nucleus.
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if red litmus paper turns blue when dipped in a solution, the solution …
1. Basic 2. Maintain a stable pH in body fluids
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read the passage and use the diagram to answer the next two questions. …
- The electrostatic attraction between the positive ion and negative chlorine forms an ionic bond. - The resulting sodium cation has a stable octet in its valence shell. - The res…
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storyline 1 exam which of the following statements about covalent bonds…
- B. Covalent bonds form when atoms of nonmetals are close enough to each other for their orbitals to overlap. - C. Covalent bonds can be single, double, or triple bonds. - E. Cov…
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atomic structure worksheet 1. name the three main subatomic particles a…
1. | Particle | Charge | |--|--| | Proton | Positive (+1) | | Neutron | Neutral (0) | | Electron | Negative (-1) | 2. - 8: Atomic number - O: Element symbol - Oxygen: Element name…
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during the baking process, the temperature of the oven significantly im…
D. The increased temperature causes the kinetic energy of the dough particles increases, leading to faster expansion and a lighter texture, but risks burning the crust.
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a study shows that synthetic motor oil performs better in colder temper…
B. The higher kinetic energy of synthetic oil particles at lower temperatures reduces viscosity, allowing for better engine performance.
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select all the statements that best describe an atom. has no net charge…
- has no net charge and has a cloud surrounding a dense inner core - contains subatomic particles named the proton, neutron, and electron - is the smallest particle of an element …
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name vanessa kirabo period chemistry atomic structure worksheet 1. name…
1. | Particle | Charge | |--|--| | Proton | Positive (+1) | | Neutron | Neutral (0) | | Electron | Negative (-1) | 2. - \(8\): Atomic number - \(O\): Symbol - \(Oxygen\): Name - \…
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which pattern(s) may be observed from the arrangement of elements in th…
increasing number of protons, similarity in their physical and chemical properties, similarity in the number of their valence electrons
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instructions: balance the chemical equations below. 1) ——n2+——o2→——n2o …
1. \(2N_2+O_2 ightarrow 2N_2O\) 2. \(Zn + 2HCl ightarrow ZnCl_2+H_2\) 3. \(4Fe + 3O_2 ightarrow 2Fe_2O_3\) 4. \(2Al+3FeO ightarrow Al_2O_3 + 3Fe\) 5. \(P_4+5O_2 ightarrow 2P_2O_5\…
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review each of the chemical compounds and classify each one based on wh…
- **Covalent**: \(CF_4\), \(NI_3\), \(C_5H_{10}O_5\) - **Ionic**: \(K_2O\), \(NH_4Br\), \(Ba(OH)_2\)
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one property of electrons is that they move in the orbitals. how do ele…
Electrons spin in the same orbital.
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a chemistry graduate student is very skilled at analyzing atomic emissi…
Copper
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read the passage and use the diagram to answer the next two questions. …
one; seven
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#4 naf + br₂ → nabr + f₂ na: f: br: #3 bas + li₃n → ba₃n₂ + li₂s ba: s:…
$$\mathrm{3BaS + 2Li_3N ightarrow Ba_3N_2 + 3Li_2S}$$ $$\mathrm{2NaF + Br_2 ightarrow 2NaBr + F_2}$$
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the figure shows the elements of period 3 and the first 3 elements of g…
Se, Na, Na, Ar, O
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what group would this element be in?
Group 15
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how many valence electrons does this atom have?
6
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instructions: balance the chemical equations below. identify how many a…
1. $2\text{HgO} ightarrow2\text{Hg}+\text{O}_2$ (Hg: 2, O: 2) 2. $\text{P}_4 + 3\text{O}_2 ightarrow2\text{P}_2\text{O}_3$ (P: 4, O: 6)
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what element is this atom?
Silicon
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what group is this element in?
Group 16
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which period is this element in?
4
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what period would this element be in?
Period 3
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what group would this element be in?
Group 16
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how many valence electrons does this atom have? enter a number for your…
6
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formic acid, which is found naturally in some ants, boils at 101°f. whi…
above 0°F
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exercise 3. provide the formula for each compound. nickel (iii) carbona…
nickel (III) carbonate: \(Ni_2(CO_3)_3\) calcium nitrate: \(Ca(NO_3)_2\) copper (II) acetate: \(Cu(C_2H_3O_2)_2\) potassium phosphate: \(K_3PO_4\) silver acetate: \(AgC_2H_3O_2\) …
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exercise 2. provide the formula for each compound. sodium sulfate sodiu…
sodium sulfate: \(Na_2SO_4\) sodium bisulfate: \(NaHSO_4\) sodium sulfite: \(Na_2SO_3\) sodium sulfide: \(Na_2S\) copper (I) sulfate: \(Cu_2SO_4\) copper (II) sulfite: \(CuSO_3\) …
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fill in text notes from 4.3 atomic number (page 98) • the number of ___…
- protones - número atómico - 1, 1 - número atómico - neutros, protones, electrones - protones, electrones - protones, electrones
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19. true (a) or false (b): the quantum mechanical model treats electron…
19. A. True 20. a 21. b. energy level 22. a. orbital type/shape 23. c. number of electrons 24. c. Na 25. c. Hund's Rule
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mixtures of matter tips for success • read the assignment carefully and…
The scientist can perform distillation. Heat the liquid. If it's a mixture, substances with different boiling points will vaporize at different times, be condensed, and collected …
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327 chemistry prep b unit 3 ch. 5 test directions: choose the best answ…
1. c. Orbital Diagram 2. a. Energy Levels 3. d. Electron Configuration 4. b. Trough 5. b. Visible light 6. a. Valence Electrons 7. c. Wavelength 8. d. amplitude 9. d. 14 10. b. 2 …
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question 2. which of the following orbital notations for phosphorus is …
The orbital notation where the \(3p\) orbitals have three unpaired electrons (one in each of the three \(3p\) orbitals) is correct. So, the option with \(3p\) orbitals having thre…
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where is most of the mass in an atom located? * in the nucleus in the p…
in the nucleus
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what is the atomic number of the atom pictured * 9 p+ 10 n0 9 10 18 19
9
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match the family/group names to the correct columns on the periodic tab…
Alkali Metals - 1 Alkaline Earth Metals - 2 Boron Family - 13 Carbon Family - 14 Nitrogen Family - 15 Oxygen Family - 16 Halogens - 17 Noble Gases - 18 Transition Metals - 3 - 12
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15 multiple choice 1 point iron (iii) selenide fe₂se₃ fe₃se fese fe₃se₂
\(Fe_{2}Se_{3}\) (the first option)
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14 multiple choice 1 point copper (ii) nitride cu₂n cu₃n₂ cun cu₂n₃
B. \(Cu_3N_2\)
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13 multiple choice 1 point fe(so₄) iron (ii) sulfate iron (ii) sulfide …
Iron (II) Sulfate
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in the modern periodic table elements are arranged by: * atomic mass at…
- First question: atomic number - Second question: Chlorine (Cl)
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12 multiple choice 1 point chromium (iii) oxide cr₂o₃ cro cr₃o cr₃o₂
\(Cr_{2}O_{3}\) (the first option)
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11 multiple choice 1 point ag₂o silver (ii) oxide silver oxide silver (…
Silver (I) Oxide
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what is the atomic number of this atom? * lithium if an atom has 12 pos…
- First question: 3 - Second question: 12 electrons
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10 multiple choice 1 pointcu₂o copper oxide (i) copper (ii) oxide coppe…
Copper (I) Oxide
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9 multiple choice 1 point pds₂ palladium sulfide (ii) palladium (ii) su…
Palladium (IV) Sulfide
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8 multiple choice 1 point aubr gold (i) bromide gold bromide (i) gold b…
Gold (I) Bromide
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7 multiple choice 1 point cocl₃ cobalt chloride (iii) cobalt (iii) chlo…
B. Cobalt (III) Chloride
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6 multiple choice 1 point pt(po₄) platinum phosphate platinum (iii) pho…
Platinum (III) Phosphate
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which subatomic particles contribute the most to the mass of an atom? *…
- First question: Protons and Neutrons - Second question: 7
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5 multiple choice 1 point nif₂ nickel fluoride nickel (ii) fluoride nic…
Nickel (II) Fluoride
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beryllium - be is in group number... * group 2 group 3 group 4 group 7 …
1. Group 2 2. 6 3. Noble gases
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an atom has an atomic number of 15 and a mass number of 31. how many pr…
15 Sulfur (S)
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what is the mass number? * the number of protons in the nucleus. the nu…
the number of protons and neutrons in the nucleus.
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what subatomic particles would you find in the nucleus of an atom? * pr…
Protons and Neutrons
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how is the number of neutrons in the nucleus of an atom calculated? * a…
subtract the number of protons from the mass number
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most of the mass in an atom is made up of which of the following? * pro…
protons and neutrons
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what is the atomic number?* the number of protons in the nucleus the nu…
the number of protons in the nucleus
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the federalist papers 1. a republic, by which i mean a government in wh…
A. whether small or large republics are better
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how many valence electrons will an atom of oxygen have? 3 4 5 6
6
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which of the following determines the identity of an element? * number …
number of protons
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what is the atomic number of an element that has 9 protons, 9 electrons…
9
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in order for an atom to be neutral what has to be true? * the atom has …
The atom has the same number of protons and electrons.
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the horizontal rows on the periodic table are called_ * groups families…
periods (the option "periods" is the correct one among the given choices)
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which element will have a higher electronegativity value?* lithium fluo…
Fluorine
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which is an alkali metal? * magnesium (mg) iron (fe) sodium (na) europi…
Sodium (Na)
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question 10 for the titration of acetic acid with sodium hydroxide, the…
A. \(1:1\)
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3. which of the following statements are true of the quantity weight? l…
A. The weight of an object is dependent upon the value of the acceleration of gravity. B. The weight of an object would be less on the Moon than on the Earth. D. Two objects of th…
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question 9 what is the purpose of the \scout trial\? a to do a rapid tr…
A. to do a rapid trial to estimate the endpoint