Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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1. read the passage which describes aspects of the behavior of gases. s…
expand, increased, more, compressibility (the option with this list, likely the third option as marked in the image: "expand, increased, more, compressibility")
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a meteorologist is measuring air samples (a gas sample) taken from diff…
The option stating: *"The air sample from the mountaintop would be less dense. The lower pressure at the mountaintop means that the molecules would be further apart. Therefore, fe…
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question 1: planning and data collection part a this investigation is a…
I choose to change the amount of baking soda. Reason: Baking soda is a solid, so its mass can be precisely measured and controlled to manipulate the reaction (between baking soda …
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1 a sample of oxy... volume of 2 l is compressed to a volume of 1 l. ba…
The option (assuming the third option in the list, with text "The number of collisions and the pressure both increase"): The number of collisions and the pressure both increase.
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which parts of the fuel cell do a and b represent? air anode and cathod…
B. anode and cathode
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which limitation of fuel cells is the most likely reason why people are…
A. Hydrogen gas is volatile
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determine which characteristics of a chemical change each example shows…
To solve this, we analyze each example: ### 1. Popping an Inflated Balloon - **The chemical makeup of the substance changes?** No (just a physical change in shape/volume of the ba…
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| | popping an inflated balloon | dissolving sugar in water | mixing vi…
To solve this, we analyze each process: ### 1. Popping an Inflated Balloon - **Physical change**: Popping a balloon only changes its shape/state (no new substance, chemical makeup…
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what is the purpose of finding oxidation states in the half-reaction me…
B. to identify the half reactions for the equation
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consider the redox reaction below. zn(s) + 2hcl(aq) ——→ zncl₂(aq) + h₂(…
B. $\ce{Zn(s) -> Zn^{2+}(aq) + 2e^-}$
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which equation describes a reduction? ○ mg(s) ⟶ mg²⁺(aq) + 2e⁻ ○ 2cl + …
B. \( 2\text{Cl} + 2\text{e}^- \longrightarrow 2\text{Cl}^- \)
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consider the half reaction below. cu²⁺(aq) + 2e⁻ ⟶ cu(s) which statemen…
B. Copper is being reduced.
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a student is asked to balance an equation by using the half - reaction …
A. $\ce{Cl_{2} + 2Br^{-} -> Br_{2} + 2Cl^{-}}$
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based on the information in the table, which two elements are most like…
bismuth and nitrogen, because they have the same number of valence electrons
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which statement is true of the following reaction? h₂ + o₂⟶h⁺ + o²⁻ it …
It is not balanced for oxidation state or for number of atoms.
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unit 3 matter interactions > lesson 5 physical vs. chemical change mark…
To solve this, we analyze each example based on physical and chemical change concepts: ### 1. Popping an Inflated Balloon - **A physical change occurs**: ✔️ (Popping a balloon is …
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part of one row of the periodic table is shown. which elements atoms ha…
tellurium (Te)
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how many groups are in the modern periodic table? ○ 12 ○ 18 ○ 22 ○ 24
B. 18
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consider the redox reaction below. mg(s) + fe²⁺(aq) → mg²⁺(aq) + fe(s) …
A. $\ce{Fe^{2+}_{(aq)} + 2e^- \longrightarrow Fe_{(s)}}$
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this is how krypton appears in the periodic table. 36 kr krypton 83.80 …
A. 36
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which half-reaction correctly describes an oxidation? ○ ca(s) + 2e⁻ ⟶ c…
D. $\ce{Cr(s) -> Cr^{3+}(aq) + 3e^-}$ (assuming the last option is D, if options are labeled A - D with the last one as D)
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while looking at calcium (ca) on the periodic table, a student needs to…
directly to the right
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which is an important step in the alternate method for balancing equati…
C. determining the half reactions of chemical equations
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what are 1a, 3b, and 7a examples of on the periodic table? ○ groups. ○ …
A. groups.
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which describes the oxidizing agent in a chemical reaction? the substan…
D. the substance that is reduced because it gains electrons
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consider the following reaction. co₂(g) + h₂(g) ——→ co(g) + h₂o(l) what…
D. hydrogen
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elements in group 2 are all called alkaline earth metals. what is most …
B. which chemical properties they have
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what is the oxidation number for s in the compound so₃? (recall that o …
+6
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which best describes the oxidizing agent in this reaction? cl₂(aq) + 2b…
C. Chlorine (Cl) is the oxidizing agent because it gains an electron.
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dmitri mendeleev and henry moseley developed their periodic tables abou…
C. The number of protons in an atom is different than the atom’s total mass. (Note: The option description might have a slight wording issue, but the core idea is that the number …
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which type of reaction occurs in the following? 2hgo(s) → 2hg(l) + o₂(g…
a decomposition reaction in which a metal is reduced
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which answer best describes what is happening in the following reaction…
B. This is a redox reaction in which octane ($\ce{C8H18}$) is the reducing agent.
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the element phosphorus is located to the right of the element magnesium…
Phosphorus has a larger atomic mass.
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the presence of which reactant is the best indicator of an oxidation-re…
D. $\ce{H_{2}}$
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which identifies an oxidation-reduction reaction? a double replacement …
C. a reaction in which oxidation numbers change
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which best identifies why the rusting of an iron nail in the presence o…
B. Electrons are transferred.
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naming molecular compounds and acids: provide the correct name or chemi…
$NO$ ### 2. $\boldsymbol{N_2O_5}$
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given the reaction below, which is being reduced? mg + cl₂ ⟶ mg²⁺ + 2cl…
B. $\ce{Cl_{2}}$
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name: name: period: matter vocabulary matching cut off the column of vo…
To solve this matter vocabulary matching, we analyze each definition and match it with the correct term: 1. **Matter that flows but has a definite volume** → Liquid (liquids flow …
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naming ionic compounds: provide the correct name for the following chem…
Magnesium bromide ### 2. $\boldsymbol{Cr_2S_3}$
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a 1.00 l volume of hcl reacted completely with 2.00 l of 1.50 m ca(oh)2…
6.00 M
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a number of beakers have different concentrations of a solution. which …
It has the most solute for a given volume.
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a solution of hcl has h⁺ = 0.01 m. what is the ph of this solution? use…
2
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which of these correctly defines the poh of a solution? the log of the …
D. the negative log of the hydroxide ion concentration
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what is the name of a solution whose concentration of solute is equal t…
B. saturated
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soaps feel slippery on our hands because they dissolve the oil on our s…
D. a base
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the table below shows four samples of carbon dioxide gas and the temper…
1 (Sample 1)
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what should this mixture be classified as? colloid compound solution su…
D. suspension
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an unknown substance turns blue litmus paper to red. which additional t…
D. It should turn methyl orange to red because it is an acid
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jacob’s journey through canaan genesis 33:16-36:43 a. the journey begun…
To solve these questions, we refer to the specified Bible verses (Genesis chapters 33 - 35) for each sub - question: ### Part A: The Journey Begun (Genesis 33:16 - 34:31) 1. **Que…
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which heterogeneous mixture contains large particles that can settle ou…
D. suspension
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which is true about the dissolving process in water? ○ polar solutes do…
B. Water molecules are attracted by solute ions at the surface of the solute
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what type of mixture scatters light and cannot be filtered easily? ○ a …
a colloid, a heterogeneous mixture
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which statements are true of heterogeneous mixtures? 1) they settle out…
1 and 2
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which factor causes a decrease in the rate of dissolution? ○ decreasing…
C. decreasing the surface area of the solute
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depends on the type of matter in a sample matter that takes both the sh…
To solve this matching problem, we analyze each term and its definition: 1. **Extensive Property**: Depends on the amount (type/amount) of matter in a sample. 2. **Plasma**: Highl…
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lesson review 1. which of these is not made up of two or more substance…
B. compound ### Question 2
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which of the following is the correctly balanced chemical equation for …
D. $\ce{Ca(OH)_{2} + 2HNO_{3} ightarrow 2H_{2}O + Ca(NO_{3})_{2}}$
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which description correctly characterizes the acidity or basicity of a …
B. The higher the pH is, the more the hydroxide ion concentration increases and the more basic the solution becomes.
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which pair of substances would most likely result in the production of …
C. metal and carbonate
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which of the following substances is an arrhenius acid? ○ bf₃ ○ hcn ○ n…
B. HCN
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a solution of ammonia has a ph of 11.8. what is the concentration of oh…
\(6.31\times10^{-3}\ M\)
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question 14 zinc metal can be flammable. true false
A. True
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given that the molar mass of nacl is 58.44 g/mol, what is the molarity …
3.00 M
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question 13 1 pts modern pennies are made completely out of copper. tru…
False
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lewis acids and bases are most closely associated with which process? ○…
B. electron transfer
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what type of substance reacts with limestone (caco₃) and produces carbo…
an acid
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question 12 1 pts a modern nickel coin is composed mainly of the elemen…
B. False
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the table below lists some acids and bases strong acids | weak acids | …
\( NH_3 + HNO_3 \)
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question 11 an alloy of iron and carbon. (one word...watch your spellin…
Steel
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question 10 what is the chemical formula for sodium hydroxide? (watch u…
NaOH
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what chemical is the main component of natural gas? (what were buring a…
Methane
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which factor influences both solubility and the rate of dissolution? ○ …
B. temperature
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an acid is a substance that increases the concentration of h₃o⁺ ions in…
A. $\ce{C6H5OH(aq)}$
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what is the arrhenius definition of a base? a substance that increases …
B. A substance that increases $\ce{OH-}$ concentration when it is dissolved in water
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question 8 1 pt what is another name for sodium hydroxide? (there are m…
caustic soda
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question 7 1 pt an alloy of copper and tin. (watch your spelling)
bronze
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which characteristic best identifies an arrhenius base? ○ it must donat…
B. It must accept protons from an acid
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which of these factors will cause a solid solute to dissolve faster? ○ …
D. increasing the surface area of solute
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type the numerical value of zincs melting point (in degrees celsius). (…
419.53
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type the numerical value of coppers melting point (in degrees celsius).…
1085
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which are produced when hcl reacts with ca(oh)₂? ○ cl₂, h₃, and cao ○ c…
D. $\ce{CaCl_{2}}$ and $\ce{H_{2}O}$ (assuming the last option is labeled D, with the correct formula $\ce{CaCl_{2}}$ and $\ce{H_{2}O}$)
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use the following table to answer the question. strong acids\tweak acid…
A. \( 2NaOH + H_2SO_4 \)
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an acid (x) reacts with a base (y) to produce mg₃(po₄)₂. what are x and…
B. \( X = \ce{H3PO4} \), \( Y = \ce{Mg(OH)2} \)
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there are two stanzas with the rhyme scheme abab throughout. there are …
The correct option is: "There are two stanzas with the rhyme scheme ABCB throughout." (Assuming the poem’s structure matches this; adjust if the poem’s actual scheme differs, but …
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use the following table to answer the question. | strong acids | weak a…
D. \( NaOH + CH_3COOH \)
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question 3 4 pts what hazardous properties does sodium hydroxide have? …
- $\boldsymbol{\text{Can release dangerous amount of heat when dissolved in water.}}$ (checked) - $\boldsymbol{\text{Can cause blindness if it contacts your eyes.}}$ (checked) - $…
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question 2 1 pts where is the hottest part of the bunsen burner flame? …
A. at the tip of the inner (bright blue) cone
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which equation represents the total ionic equation for the reaction of …
C. $\ce{H^{+} + NO^{-}_{3} + Na^{+} + OH^{-} -> Na^{+} + NO^{-}_{3} + H_{2}O}$
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question 1 match the following terms and definitions... a substance tha…
To solve this matching problem, we recall the definitions of key chemical terms: 1. **"A substance that has the characteristic properties of a metal and contains more than one ele…
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consider the incomplete reaction below. naoh + x —→ nach₃coo + h₂o what…
D. $\ce{CH3COOH}$
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which scientist developed the first model of the atom that proposed the…
D. Thomson
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what is the net ionic equation for the reaction that is represented by …
\( 2\mathrm{PO}_4^{3-} + 3\mathrm{Ca}^{2+} \longrightarrow \mathrm{Ca}_3(\mathrm{PO}_4)_2 \)
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which statement belongs to dalton’s atomic theory? atoms have a massive…
Atoms cannot be created or destroyed.
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conservation of mass in chemical reactions: investigating the rearrange…
### Fill in the Blank Answers: 1. The Law of **Conservation** of Mass says that mass is not created or destroyed in a chemical reaction. (From the text: "This is called the Law of…
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which statement best describes the ph of pure water? ∘ it is neutral be…
It is neutral because the concentration of hydronium ions equals that of hydroxide ions.
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element atomic number # of protons # of electrons # of valence electron…
| Element | Atomic Number | # of Protons | # of Electrons | # of Valence Electrons | Circle (GAIN/LOSE/NEITHER + electrons) | Oxidation Number | |---------|---------------|-------…
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which would most likely be the ph of a highly-corrosive acid? ○ 1 ○ 5 ○…
A. 1
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the ph of a solution is 2.0. which statement is correct? useful formula…
A. The pOH of the solution is 12.0.
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the atomic models after dalton’s time included ideas about the atomic s…
Rutherford’s model