化學
化學反應、化學計量、分子結構與元素性質。
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clues eins/sehr gut zwei/gut drei/befriedigend vier/ausreichend fünf/ma…
None of the options seem to accurately match the grade "D+". However, if we assume a mis - mapping of grades and consider "D+" as a relatively low grade, the closest (though still…
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use the periodic table to choose the element that matches each descript…
chlorine ### group IIA:
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a classmate ran the same lab. they obtained 1.28 g of water vapor (h₂o)…
74.41%
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in the lab, we found that we obtained 0.90 grams of water vapor (h₂o). …
52.32%
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c₆h₁₂o₆ (s) + 6 o₂ (g) → 6 co₂(g) + 6 h₂o (g) step 1) first lets find o…
To determine the mole ratios for the reaction \( \ce{C6H12O6 (s) + 6 O2 (g) -> 6 CO2(g) + 6 H2O (g)} \), we use the coefficients from the balanced equation. ### For the \( \ce{O2}…
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ws 5h, ionic compounds w/polyatomic ions common polyatomic ions name\tf…
### Part A: Naming Ionic Compounds with Polyatomic Ions #### a. $\ce{CaCO_{3}}$ ## Step1: Identify cation and polyatomic ion Cation: $\ce{Ca^{2+}}$ (calcium), Polyatomic ion: $\ce…
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what caused the color? the flame was pink/purple for the green bear jus…
metals
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what caused the color? the flame was for the green bear just like the r…
1. First dropdown: the same 2. Second dropdown: did not 3. Third dropdown: chemicals (or elements/ions) 4. Fourth dropdown: gummy bear 5. Fifth dropdown: ions (or elements/chemica…
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trial 1 trial 2 (from video) potassium chlorate before heating white po…
To fill in the "TRIAL 2 (from VIDEO)" column, we match the observations from Trial 1 with the provided options (assuming the video trial has similar or consistent results for thes…
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what did at least 20,000 women do during the civil war? a. headed to th…
1. b. Signed up as battlefield nurses 2. a. Establish the American Red Cross 3. c. Bromine 4. d. The portable camera had become widespread. 5. c. It became common to embalm bodies…
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multiple-choice question why are there no parentheses in this formula? …
Because there is only one carbonate, so it is not needed.
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multiple-choice true or false: ion charges are still shown in the chemi…
False
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part 4: explain direction: briefly explain why each element has a large…
Chlorine is to the right of Aluminum in the same period. Moving right across a period, effective nuclear charge increases (more protons, same electron shells), pulling electrons c…
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what is the correct formula for ammonium? ammonium: $\\ce{nh_{4}^{+}}$ …
A. ammonium: $\text{NH}_4^+$
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ng formulas for ternary compounds (with polyatomic lons) calcium nitrat…
B. Because he has two of everything inside the parentheses (assuming the second option is labeled B; adjust the label based on the actual question's option numbering, but the corr…
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2. what distinguishes a pure substance from a mixture? a. substances ar…
D. Mixtures can be separated physically, while compounds cannot.
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in the early 1800s. franz gall proposed his theory of phrenology, which…
A. bumps on the skull that could reveal a person's mental abilities and character traits.
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this is a picture is a representation of what ty bond and ion? this is …
Na
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bell work - metallic bonds this is a picture is a representation of wha…
This is a picture of a metallic bond and a cation (positive) ion.
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the attractive force of electrostatic attraction as the charge on the n…
increases
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data table: solubility of sulfite compounds 11. a student performed an …
Sulfite compounds are typically insoluble, but alkali metals are an exception to this.
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na melts at a lower temperature than mg because the melting point depen…
True
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10. if each of these bottles of carbonated water initially contained th…
Bottle 4
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passage ii glowing on an adventure as i pulled my camera out of my back…
16. J. me; she pointed 17. C. glowing," she said in a hushed, whispering voice. 18. F. NO CHANGE 19. D. in 20. J. be utterly dark. 21. A. I figured she had been to the caves befor…
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8. according to your solubility rules, which of the following salts has…
A. NaClO
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8. which visual aid would make the most sense to include in a quick sta…
an illustration of toothpaste being squeezed onto a toothbrush
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writing chemical formulae (i) 1) magnesium oxide 2) lithium bromide 3) …
1) $\text{MgO}$ 2) $\text{LiBr}$ 3) $\text{Ca}_3\text{N}_2$ 4) $\text{Al}_2\text{S}_3$ 5) $\text{KI}$ 6) $\text{SrCl}_2$ 7) $\text{Na}_2\text{S}$ 8) $\text{RaBr}_2$ 9) $\text{MgS}…
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3. bleach is a chemical used as a cleaning product and is commonly foun…
B. Base
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extract from an article about master perfumers by scott suyare gary mar…
(i) indifferent: Having no particular interest or sympathy; unconcerned/neutral (ii) repelled: Filled with disgust or aversion; repulsed (iii) morph: To change smoothly from one f…
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writing chemical formulae (ii) 1) iron(ii) chloride 2) copper(i) sulfid…
1. $\text{FeCl}_2$ 2. $\text{Cu}_2\text{S}$ 3. $\text{PbI}_4$ 4. $\text{SnF}_2$ 5. $\text{Hg}_2\text{Br}_2$ 6. $\text{SnO}$ 7. $\text{Cr}_2\text{O}_3$ 8. $\text{AuI}$ 9. $\text{Mn…
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in each row, select the molecule with the highlighted h atom that is mo…
s: Row 1: The first molecule (with $\ce{O^+ - H}$) Row 2: The second molecule (with $\ce{S - H}$) Row 3: The first molecule (with $\ce{S - H}$) Row 4: The second molecule (with $\…
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in each row, select the molecule with the highlighted h atom that is mo…
To determine the more acidic molecule in each row, we analyze based on the stability of the conjugate base (after losing \( \ce{H^+} \)) and electronegativity/atom size: ### Row 1…
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lab: ionic and covalent bonds warm-up active formulate a hypothesis the…
...high melting and boiling points, solubility in polar solvents like water, ability to conduct electricity when dissolved in water or melted, and a crystalline solid structure at…
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extract from an article about master perfumers by scott sylvare gary ma…
### (f)(i) 1. Firmenich claims that its scented products reach more than half the world's population every day. 2. The fragrance and flavour industry brings in an estimated $30 bi…
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extract from an article about master perfumers by scott sayare gary mar…
## (c)(i) To mask unwanted odors and create a pleasant, consistent atmosphere for passengers. ## (c)(ii) To stimulate customers' desire to purchase popcorn, increasing concession …
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Question was provided via image upload.
## (a)(i) He needed money, had no formal perfume background, but had a talent for remembering chemical odours. ## (a)(ii) His employer noticed his natural ability to remember chem…
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now that we know the \types of reactions\ it is important for us to als…
### First Equation: Balancing $\boldsymbol{KClO_3 ightarrow KCl + O_2}$ # Explanation: ## Step1: Balance Oxygen atoms On the right, $O_2$ has 2 O atoms, and on the left, $KClO_3$ …
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the two reactions that will take place are as follows. 1st) ( ce{kclo_3…
1st reaction: Decomposition 2nd reaction: Combustion
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matching 4 points match each database role to its scenario. steve is re…
- Steve: db_denydatareader - Mark: db_bckupoperator - Jessica: db_owner - Taylor: db_denydatawriter
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a writer is writing the content for the company website of a backpack m…
1. While shopping for a backpack for his young son, company founder Adam Chen noticed that all of the "boy" backpacks depicted robots, monsters, or vehicles—none of which interest…
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7. which of the following is the best way to determine the relative age…
D. Look at the position of the layer compared to other layers.
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categorization 4 points indicate if each of the given statements relate…
s: 1. It can be categorized into physical and logical schemas. → True 2. The physical schema defines the structure of the database. → False 3. It defines everything about the data…
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2. what type of fossils form when minerals replace the organic material…
C. petrified fossils
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matching 5 points match the vocabulary term to its correct definition. …
- Structured Query Language (SQL) : programming and query language common to many relational database management systems - Structured data : structured tables, allowing for the ea…
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which of these is not a fertilizer component symbolized by npk on a fer…
Krypton
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1. what advance in technology helped lead to trench warfare? a. the air…
D. the machine gun ### Question 2
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name: mad minute: vsepr shapes & angles directions: fill in the missing…
### First Row (Linear Molecule): ## Step1: Analyze the molecule diagram The first molecule diagram is a straight line with three atoms (two terminal, one central), so it's a linea…
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rodrigo is trying to complete a crossword puzzle, but hes stuck on a se…
Tonya, who's taking organic chemistry this semester ### Second Question (Drug Identification)
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name: _guina takemura_ per: _1_ date: _2/5/26_ \gram to mole\ stoichiom…
30.3 mol (or 30.25 if 4 sig figs, but 121 has 3, so 30.3) ### Problem 2:
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what state of matter is the element found at stp? * (1 point) solid liq…
If the element has 8 protons (oxygen), state is Gas. If 16 protons (sulfur), state is Solid. But likely, for the proton question, let's check the second part. ### Second Question …
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5 what is the atomic mass of the element? * 80 121 201 281
C. 201 (assuming the element is Mercury or similar with atomic mass around 201; note: the question lacks the element's name, but from common atomic masses, 201 is a valid option f…
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4 what is the atomic number of the element? * (1 point) 80 121 201 281
A. 80
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3 how many electrons does the element have? * (1 point) 80 121 201 281
A. 80
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6. white distilled vinegar has a hydrogen ion h⁺ concentration of appro…
C. pH = 2.5
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14. a solution of cuso₄ is made by dissolving.15 g in enough water to m…
$\approx 0.0063\ \text{M}$ (or $6.3\times10^{-3}\ \text{M}$) ### Question 15:
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13. a student mixed 3 moles of kf with enough water to make 740 ml of s…
The molarity of the solution is approximately $\boldsymbol{4.05\space M}$.
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3. what is always written first in the name of an acid to identify it a…
## Question 4: a. hypophosphorous acid b. telluric acid c. selenous acid d. formic acid e. bromous acid ## Question 5: a. $\ce{HFO2}$ b. $\ce{HC7H5O2}$ c. $\ce{HCNO}$ d. $\ce{H2C8…
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calculate the empirical formula of the following compounds: 7. a compou…
$Na_2S$ ### Problem 8:
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how many grams of alcl₃ are produced if 300 g of h₂ are produced? 2al +…
1. 1320 g
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percent composition and empirical formula worksheet calculate the perce…
Let's solve each problem one by one. We'll start with problem 1: calculating the percent composition of \( \text{Pb(NO}_3\text{)}_2 \). ### Problem 1: Percent Composition of \( \t…
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balance the following equations by placing small whole - number coeffic…
$\ce{2Ba + O_{2} -> 2BaO}$ For problem 2 (Synthesis: $\ce{C + S -> CS_{2}}$):
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p7 reactivity trend 9 b. based on the reactivity table, which statement…
D. Potassium (K) is more reactive than Magnesium (Mg)
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7. two students are discussing solubility. student a says, “a polar mol…
Student B is correct because solubility follows the "like dissolves like" principle. Polar water molecules (which rely on dipole-dipole and hydrogen bonding interactions) cannot f…
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4. copper metal and aqueous silver (i) nitrate react to form silver met…
### Question 4 # Explanation: ## Step 1: Write the unbalanced reaction The reactants are copper metal ($\text{Cu}(s)$) and aqueous silver(I) nitrate ($\text{AgNO}_3(aq)$). The pro…
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lewis dot pt lewis dot pt use the periodic table to answer the question…
A. Fluorine 7 valence electrons, Chlorine 7 valence electrons
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post-lab questions: 1. if an element is more electronegative does that …
1. A more electronegative element creates a partial negative charge. This is because it strongly attracts the shared electrons in a bond, concentrating electron density around its…
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properties - metals and nonmetals properties - metals and nonmetals pro…
D. F and Br
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2. how many moles of co₂ are needed to react when do 2.41×10²⁴ molecule…
\( 4.00\ \text{moles} \) ### Question 3
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33. question text unclear a. option a text unclear b. option b text unc…
38. B. Chemical property 39. C. Conductivity 40. C. Extensive 41. B. Malleability 42. B. It lowers the freezing point of water 43. A. Roy J. Plunkett 44. C. Chemical
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24. which property allows graphite in pencils to leave marks on paper? …
24. C. Brittleness 25. A. Ductility 26. C. Reactivity 27. C. They can be observed with the five senses. 28. B. Transparency 29. C. Chemical property 30. B. Intensive property 31. …
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multiple choice questions choose the correct answer for each question. …
17. B. Density 18. D. Mass 19. B. Physical 20. C. Flammability 21. C. Density 22. B. Conductivity 23. D. Volume 24. A. Intensive
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physical and chemical properties worksheet fill in the blank fill in th…
1. Conductivity 2. boiling point 3. physical 4. intensive 5. mass 6. chemical 7. physical 8. chemical 9. Ductility 10. Malleability 11. melting point 12. freezing 13. physical 14.…
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stoichiometry quiz 1. solid potassium reacts with chlorine gas to produ…
Approximately \( 5.50 \, g \) (or \( 5.498 \, g \)) ### Question 2
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rties of four different compounds, ionic compound. his wn in the chart.…
Z
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anna stated that ionic compounds have high melting points and low boili…
A. Strong electrical forces will make ionic compounds have high boiling points
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question 11 of 12 a 30.0 ml sample of pond water contains $1.75 \\times…
equivalent mass = 50.0 g (or 50.05 g) concentration of $\text{CaCO}_3$ = 350 ppm (or 350.3 ppm)
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ese diagrams show two atoms of fluorine and an atom magnesium. which sh…
The correct option is the one where "A magnesium atom donates two electrons to fluorine atoms → Each fluorine atom accepts the electrons → The magnesium atom becomes a +2 ion → Ea…
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naming covalent and ionic compounds worksheet name:____________________…
1. Sulfur dibromide 2. Ammonium sulfate 3. Nitrogen dioxide 4. Lead(IV) carbonate 5. Dinitrogen monoxide 6. Zinc fluoride 7. Carbon tetrachloride 8. Hydrogen selenide 9. Aluminum …
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stoichiometry quiz 1. solid potassium reacts with chlorine gas to produ…
Approximately $\boldsymbol{5.50\ \text{g}}$ (or $5.498\ \text{g}$) ### Question 2
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11) complete the following table to describe three states of matter. th…
### Question 11: Completing the table for three states of matter | | Solid | Liquid | Gas | |----------------|--------------------------------|---------------------------------|--…
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chalk is an ionic compound. which is a property of all ionic com on a c…
a. a high melting point
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water sample was found to have 14 mg caco₃ in a 100.0 ml sample. calcul…
Concentration of $\text{CaCO}_3$ = 8.18 gpg hard
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ionic compounds form crystal structures. molecular structures. pure ele…
A. crystal structures.
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5. the term used to describe anything that has mass and takes up space …
d. matter ### Question 6
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3. which of the following is true of a heterogeneous mixture? a it is n…
c. Different samples may not be exactly alike. ### Question 4
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responder a las preguntas a continuación. dar respuestas con enteros o …
$25\ \text{cm}^3$ ### Parte (b)
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1. there are many different ways to classify matter, but one way is to …
b. mixtures or substances ### Question 2
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question 19 (5 points) \\(^{198}_{}au^+\\) contains ______ electrons, _…
D) 78, 79, 119
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Question was provided via image upload.
b) Group 2
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question 17 (5 points) which amongst the following compounds would you …
C) \(V_2O\)
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question 15 (5 points) saved which of the following acids is not named …
E) HClO₃: chlorous acid
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question 13 (5 points) which of the following is an intensive property?…
Melting point (the option with "Melting point" as the text, which was already selected in the image, but the correct choice is the one labeled "Melting point" among the options: m…
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question 12 (5 points) \\saved which pair of atoms constitutes a pair o…
C) $\boldsymbol{_{26}^{59}X}$ $\boldsymbol{_{26}^{58}X}$
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for each of the following questions, determine whether the compound is …
1) Ionic; Ammonium chloride 2) Covalent; Xenon hexafluoride 3) Covalent; Phosphorus trifluoride 4) Ionic; Iron(III) nitrate 5) Ionic; Titanium(III) bromide 6) Covalent; Krypton di…
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question 6 (5 points) which of the following pairs is incorrect? a) vin…
c) Graphite - compound
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question 5 (5 points) \\ saved which of the following is always a chemi…
Apple rotting
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question 4 (5 points) which of the following mass is the largest? 8.2 ×…
\(8.2 \times 10^{9}\space \mu\text{g}\) (the option with the radio button selected in the original problem, which is correct after unit conversion comparison)
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question 3 (5 points) \\(\\boldsymbol{\\downarrow}\\) saved which of th…
The incorrect formula - name combination is \(Na_3PO_3\): sodium phosphate (the option with this combination).
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information page (click the link to access the information page. the in…
c) Copper(I) phosphide
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question 1 (5 points) an element, y, has three isotopes. isotope (^{232…
233.59 amu