化学
化学反応、化学量論、分子構造、元素の性質。
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the beaker on the right would be a _______ (both have been recently sti…
Solution (the option labeled "Solution")
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which temperature scale is kelvin? (with an image showing temperature s…
C
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worksheet 7: trends on the periodic table topic 2 set b: data and graph…
Para completar la tabla y graficar: ### Paso 1: Identificar Elementos del Período 2 Ordenados por número atómico (izquierda a derecha): - Número Atómico 3: Li (Litio) - Número Ató…
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a substances heating curve is shown in the graph. at point e it is a __…
The option labeled "liquid" (assuming the curve's E is in the liquid phase, e.g., after melting and before boiling).
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nitrous oxide, acetone, butane and kerosene are all examples of all of …
C. inhalants
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a designer drug is a drug taken to enhance physical performance and inc…
D. a chemical variation of another substance, such as a narcotic or amphetamine (assuming the options are labeled A, B, C, D in order: A. a drug taken to enhance physical performa…
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name: homework/part 3: binary ionic compound names - solve the puzzle! …
To complete the table, use the steps of identifying ion charges and applying the criss - cross method to find formulas and then name the compounds as "Metal + Nonmetal - ide". The…
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set a: data and graphing for group 2 alkaline earth metals: objective: …
To complete the task: 1. Gather data for Group 2 elements (Be, Mg, Ca, Sr, Ba, Ra) from a periodic table/reference. 2. Plot each property (Electronegativity, Ionization Energy, At…
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how do microwave ovens use electromagnetic waves to cook food? (1 point…
The waves cause water molecules in food to vibrate and produce heat (the first option).
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when you go from f to e it is called ltlng condensation deposition subl…
The option with "Sublimation" (the right - most visible option among the given choices).
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based on the data provided below, which student has the most precise da…
Student C
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cycling of materials a new mineral in the mine is very exciting news. o…
Different mineral - forming environments show that energy (e.g., heat, pressure, chemical energy) drives matter (elements) to cycle. In igneous environments, magma (matter) cools …
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1. describe the type of mixture that you created at the beginning of th…
The mixture created at the beginning was a heterogeneous mixture. It consisted of different components (like iron filings, Styrofoam, sand, and salt) that were not uniformly distr…
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lab #5: separating mixtures (filtration lab) problem: how do you separa…
The steps to separate the mixture are: 1. Use a magnet to remove iron fillings. 2. Add water and skim off floating Styrofoam. 3. Filter to separate sand from salt solution. 4. Eva…
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the air we breathe is a(n) ____. ○ compound ○ mixture ○ element ○ alloy
B. mixture
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a substance which contains various elements or compounds without bondin…
D. mixture
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compared to a solid, the molecular bonds of a liquid are ____. ○ strong…
B. weak (assuming the options are labeled with letters, but since the original options are just the words, the correct answer is the option "weak")
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an explosion is an example of ____. ○ fusion ○ combustion ○ instant oxi…
D. detonation
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an element which will not combine chemically is ____. ○ a chemical ○ in…
B. inert (assuming the second option is labeled B; if the original options had labels like A, B, C, D with "inert" as the second option, the answer is the option with "inert". If …
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question 16 (3 points) listen in hispanic countries, pharmacies/drugsto…
A. Sell chlorine, peroxide, paint, rug cleaner, soap, and beauty items, such as perfume, hair coloring products. (Assuming the first option is labeled A, adjust identifier if need…
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question 88 (1 point) listen o²⁻ ion has _______number of electrons and…
1) 10 electrons, 8 neutrons
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for the elements family shown mathematically below in the right of the …
A. top ### Question 85
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question 87 (1 point) listen for an isotope of ag with mass number 108,…
2) 47 protons, 61 neutrons
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a particular indicator that is yellow in acid, colorless in neutral ph …
4) Blue and Yellow
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question 84 (1 point) listen the correct formulas for chromium(iii)oxid…
1) \( \text{Cr}_2\text{O}_3 \) and \( \text{AlPO}_4 \)
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question 83 (1 point) listen cr and cs represent the following elements…
3) Chromium and Cesium
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question 81 (1 point) 2cs(s) + br₂(g) →2csbr(s). this reaction can be c…
4) All of the above
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which of the following will change between isotopes? electrons neutrons…
neutrons, mass number (the checkboxes for "neutrons" and "mass number" should be selected) ### Second Question (Definition of Theory):
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question 80 (1 point) listen the correct formulas for iron(iii)sulfide …
4) \(Fe_2S_3\) and \(Co_3P_2\)
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question 79 (1 point) listen the correct names of ca₃n₂ and ba₃n₂ are: …
3) Calcium nitride and Barium Nitride
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question 78 (1 point) listen which of the following is false for a buff…
5) A buffer will prevent chemical reactions from happening.
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question 77 (1 point) listen if h⁺ is 1 × 10⁻⁷, the solution has : 1) o…
4) All of the above
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gaseous methane (ch₄) reacts with gaseous oxygen to give gaseous carbon…
3) $CH_4(g) + 2O_2(g) ightarrow CO_2(g) + 2H_2O(g)$
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what mass of water must be added to 385g of formaldehyde to prepare a 3…
3) 715g of water
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question 73 (1 point) listen cs and ba are ______and _________, respect…
2) Alkali metal and alkaline earth metal
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question 72 (1 point) the correct formulas for phosphoric acid and sulf…
3) $H_3PO_4$ and $H_2SO_4$
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use the above partial periodic table to answer questions 76-79. 76. wha…
B. 2 ### Question 77:
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question 71 (1 point) listen mn and si are __________and ________, resp…
3) Transition metal and semimetal
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question 70 (1 point) listen _______is an allotrope, and ________is a s…
4) Carbon, selenium
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in the reaction of aqueous aluminum chloride with aqueous potassium hyd…
2) Aluminum hydroxide
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calculate the molarity of a solution prepared by dissolving 11.5g of na…
2) 0.288M
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question 66 (1 point) nh₃ molecule has ____type of electron geometry an…
2) Tetrahedral, Trigonal (triangular) Pyramid
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aluminum metal reacts with gaseous chlorine to give solid aluminum chlo…
4) \(2\text{Al}(s) + 3\text{Cl}_2(g) ightarrow 2\text{AlCl}_3(s)\)
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question 64 (1 point) listen ammonia (nh₃) is 1) has lone pair of elect…
4) All of the above
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2cs(s) + br₂(g) → 2csbr(s). in an experiment, 1 mole of cs was used and…
2) 75%
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question 62 (1 point) listen which one among the following solutions is…
1) Solution with $[\text{H}^+]= 10^{-1}$
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question 60 (1 point) listen the empirical formula for the compound c₄₂…
1) \( C_6HCl_2O_4 \)
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a solution has a hydrogen ion concentration of $1 \\times 10^{-12}$m. w…
2) +12
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23. high levels of phosphorus are not toxic, but can cause digestive pr…
The maximum mass of phosphorus is \(1.25\times10^{-5}\space g\) (or \(12.5\space \mu g\)). ### Question 24 Solution:
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a hydrocarbon has the formula c₂h₄. what is the percent by mass of carb…
4) 85.6%
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when a solution contains the maximum amount of solute that it can disso…
2) False
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question 56 (1 point) the correct names of ba(no₃)₂ and nahco₃ are: 1) …
2) Barium nitrate and Sodium hydrogen carbonate
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in the reaction of aqueous aluminum chloride with aqueous potassium hyd…
3) $\ce{AlCl_{3}(aq) + 3KOH(aq) -> Al(OH)_{3}(s) + 3KCl(aq)}$
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balanced chemical equations can give us the mol ratios between reactant…
2) False
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fall final exam: mc which of the following is not considered to be a gr…
O₂ (the option with label "O₂")
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question 32 (1 point) listen h₂o molecule has ______ type of electron g…
1) Tetrahedral, Bent
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question 31 (1 point) listen a solution has 2.3moles of nacl per 1.0 li…
1) 2.3M
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when you balance the equation c₅h₁₂(l) + o₂(g) → co₂(g) + h₂o(g), the c…
4) 8
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22. iron concentrations of 0.2 to 0.3 parts per million in water can ca…
The maximum mass of iron that can be present is $\boldsymbol{3.6\space mg}$ (or $0.0036\space g$).
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the total number of maximum electrons that can be accommodated in any d…
2) 10, 14
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question 46 (1 point) listen a solution has a ph of 4.0; it is ________…
1) Acidic
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for the image above how many total domains does it have? your answer
5
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a substance has a mass of 1.50 lb (1 lb = 453.59g) and volume of 1.25l.…
1) 0.544 g/mL
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question 42 (1 point) listen magnesium hydroxide solid decomposes to gi…
3) \( \text{Mg(OH)}_2(s) ightarrow \text{MgO}(s) + \text{H}_2\text{O}(l) \)
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read section 6.1 about solutes and solvents. read the statements given …
### Pregunta 1 # Explicación: La definición de sustancias solubles es que pueden disolverse en ciertos solventes. Entonces la afirmación es verdadera. # Respuesta: T ### Pregunta …
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question 41 (1 point) listen the correct names of fe₃(po₄)₂ and zn(no₃)…
2) Iron(II)Phosphate and Zinc nitrate
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question 40 (1 point) listen and are solid halogen and gaseous noble el…
3) I and Kr
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question 39 (1 point) listen in the reaction of aqueous lead(ii)nitrate…
3) $\ce{Pb^{2+}(aq) + 2Cl^-(aq) -> PbCl2(s)}$
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question 38 (1 point) listen solid lead(ii)oxide breaks up to give lead…
3) \( 2\text{PbO}(s) ightarrow 2\text{Pb}(s) + \text{O}_2(g) \)
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a 1000ml graduated cylinder has 20 main divisions, and each main divisi…
1) True
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the element that has the electronic configuration of $1s^2 2s^2 2p^6 3s…
3) K
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question 35 (1 point) listen a chemical that changes its color in a sol…
3) Indicator
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2nh₃(g) + 3cuo(s) → n₂(g) + 3cu(s)+ 3h₂o(l). therefore, first be mindfu…
3) 7.5moles of Cu
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question 32 (1 point) listen when a relatively large amount of solute i…
2) False
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you are given 10.5m hydrochloric acid concentrated solution. if you wan…
3) 225mL acid, 300mL water
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level 1 floral certification exam you have approximately 47 minutes rem…
Secondary Colors - E. Two primary colors combined in equal amounts. Proportion - C. The relationship between the flowers, foliage & container Floral Preservative - D. A chemical p…
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question 30 (1 point) aluminum metal reacts with gaseous chlorine to gi…
4) Both b and c are correct
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aluminum metal reacts with gaseous chlorine to give solid aluminum chlo…
4) $2\text{Al}(s) + 3\text{Cl}_2 (g) ightarrow 2\text{AlCl}_3(s)$
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the balanced chemical equation for the reaction of ammonia (nh₃) when i…
1) 1.06mols
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49. what type of reaction is the following: $2h_2 + o_2 \ ightarrow 2h_…
A. Combination ### Question 50
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lead(ii)oxide breaks up to give lead metal and gaseous diatomic oxygen.…
3) \( 2\text{PbO}(s) ightarrow 2\text{Pb}(s) + \text{O}_2(g) \)
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question 26 (1 point) listen the polarity of a bond is more, if the dif…
2) False
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question 25 (1 point) ch₄ molecule has ______ type of electron geometry…
3) Tetrahedral, Tetrahedral
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question 24 (1 point) listen which of the following must be true if a s…
4) Both a and c are correct
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0.2636g of nickel (ni) metal burns with 0.1440g of sulfur (s) to give n…
2) NiS
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chem semester 1 final 2024 what is the formula of the compound formed w…
\(MgF_2\) (assuming the first option is \(MgF_2\) from the visible text, the correct option would be the one labeled with \(MgF_2\))
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al³⁺ ion has number of electrons and protons 1) 13 electrons, 14 proton…
2) 10 electrons, 13 protons
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42. many elements that are essential for life include nitrogen, oxygen,…
A. Nonmetals ### Question 43
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question 21 (1 poin listen total moles of solute will remain the same w…
1) True
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question 20 (1 point) listen as the h⁺ concentration increases for a so…
2) False
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chem semester 1 final 2024 questions #30-31, a student performs a lab e…
\(AgCl + Ca(NO_3)_2\) (corresponding to the option "AgCl + Ca(NO₃)₂")
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question 19 (1 point) listen a solution with a ph of 1 is how many time…
4) 1000
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consider the reaction $\\ce{h2so4(aq) + h2o(l) -> h3o+(aq) + hso4-(aq)}…
4) $\ce{HSO4^-}$
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36. 54 xe xenon 131.293 where is the elements atomic mass located? a. a…
A. At the bottom ### Question 37
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the number of degenerate orbitals in any p level is ____________, in an…
2) 3, 5
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question 10 (1 point) listen the correct formulas for the binary covale…
2) \( I_4F_6 \) and \( P_5O_7 \)
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question 15 (1 point) listen microgram is a lesser quantity than a nano…
2) False
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the electronic configuration of carbon (c) is: 1) $1s^22p^4$ 2) $1s^22p…
4) \(1s^22s^22p^2\)
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mixing vinegar and baking soda; combustion of gasoline; burning wood; c…
- mixing vinegar and baking soda: Endothermic Reaction - combustion of gasoline: Exothermic Reaction - burning wood: Exothermic Reaction
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question 13 (1 poi listen the correct names of pbcl₄ and nibr₂ are: 1) …
2) Lead(IV)chloride and Nickel(II)Bromide