Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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choose the best tool for each scenario. identifying a trend in temperat…
- Identifying a trend in temperature change over time: graph - Measuring the mass of a product of a chemical reaction: balance (the original answer of graduated cylinder is incorr…
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choose the best tool for each scenario. identifying a trend in temperat…
computer
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the law of conservation of mass states that, in a closed system
mass cannot be created or destroyed
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reactions involving acids na₂co₃(aq) + hcl(aq) naoh(aq) + hcl(aq)
For \(Na_{2}CO_{3}(aq)+HCl(aq)\): - Observations after mixing: Bubbles formed in mixture - Products: \(CO_{2}(g)\), \(H_{2}O(l)\), \(NaCl(aq)\) For \(NaOH(aq)+HCl(aq)\): - Observa…
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the equilibrium constant, ( k_{c} ), for the following reaction is ( 6.…
\(0.159\)
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which correctly describes a part of an atom? the neutrons are negativel…
The protons are positively charged.
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what change would most likely decrease the rate of a chemical reaction …
Placing the mixture in a freezer.
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sandy lives near the beach and notices that the metal on the outside of…
35°C (warm, summer temperature)
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11 balance the following two equations: remember both sides of the equa…
a. \(2NaHCO_3 ightarrow Na_2CO_3 + H_2O+CO_2\) b. \(2KClO_3 ightarrow 2KCl+3O_2\)
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a student places a glow stick in hot water and observes it glows more b…
The chemical reaction inside the glow stick speeds up with heat, releasing more energy as light.
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9. in the following equations, list the number of atoms of each of the …
a. Co: \(1\), N: \(4\), O: \(6\), H: \(8\), S: \(1\) b. Hg: \(2\), O: \(4\), K: \(2\), Ni: \(1\), C: \(4\), N: \(4\), H: \(4\) c. Zn: \(3\), Cl: \(6\), K: \(8\), Fe: \(2\), C: \(1…
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which of the following best explains why milk spoils faster when left o…
Warmer temperatures speed up the chemical reaction that leads to the spoiling of milk.
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it is important to understand the differences between chemical and phys…
Water turns to steam when boiled over a Bunsen burner.
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choose the best tool for each scenario. identifying a trend in temperat…
computer
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choose the best tool for each scenario. identifying a trend in temperat…
Measuring the mass of a product of a chemical reaction: electronic balance. Measuring the volume of water displaced by a solid object: graduated cylinder.
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gordon adds a piece of solid zinc metal to a beaker of hydrochloric aci…
C. a chemical change
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choose the best tool for each scenario. identifying a trend in temperat…
Measuring the mass of a product of a chemical reaction: electronic balance. Measuring the volume of water displaced by a solid object: graduated cylinder.
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question 2 which of the following statements best describes why a chemi…
Chemical changes involve formation of a new substance while physical change only impacts appearance or form.
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question 1 matter can go through two types of changes: physical changes…
rock being crushed into gravel
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reactions involving acids reactants appearance of reactants observation…
Observations after mixing: Bubbles formed in mixture, Test tube felt hotter Products: $\text{CO}_2(g)$, $\text{H}_2\text{O}(l)$, $\text{NaCl}(aq)$
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electronegativity and chemical bonds metals prefer to give away electro…
| Atoms | EN Values | Difference | Type of Bond | |---|---|---|---| | 1. Li and Na | \(1.0\) and \(0.9\) | \(0.1\) | Non - polar Covalent (NC) | | 2. Cl and F | \(3.0\) and \(4.0\…
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use the references to access important values if needed for this que th…
\(0.0121\)
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the equilibrium constant, ( k_{c} ), for the following reaction is ( 6.…
\(0.0816\)
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the equilibrium constant, ( k_{c} ), for the following reaction is 5.49…
\(0.182\)
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question 10 of 17 points: 2 sr: find strontium on the periodic table. i…
C. give away 2
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which family of the periodic table has the greatest stability because t…
B. Noble Gases
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which of these elements has the greatest stability because it already f…
A. Xenon
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classmarker ions and ionic bonds madelynn sharbonno question 7 of 17 po…
B. False
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use the references to access important values if needed for this questi…
\(4.14\times 10^{-4}\)
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ions and ionic bonds madelynn sharbonno question 6 of 17 points: 2 the …
True
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question 5 of 17 points: 2 the rule that says that most atoms want to h…
D. octet rule
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use the references to access important values if needed for this questi…
\(0.326\)
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use the references to access important values if needed for this questi…
\(0.318\)
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ions and ionic bonds madelynn sharbonno question 4 of 17 points: 2 the …
B. False
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ns and ionic bonds madelynn sharbonno see all que question 3 of 17 poin…
- "a positive ion that is a metal that has lost electrons" → cation - "a negative ion that is a nonmetal that has gained electrons" → anion
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ions and ionic bonds madelynn sharbonno question 2 of 17 points: 2 why …
C. They want stability by fulfilling the octet rule.
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some ions from the transition metals are twins that have different char…
True
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reactions · reactions in solution (balancing equations) introduction la…
1. \(2\text{NaOH}(aq)+\text{CuSO}_4(aq)\to\text{Cu(OH)}_2(s)+\text{Na}_2\text{SO}_4(aq)\) 2. \(2\text{NaCl}(aq)+\text{Pb(NO}_3)_2(aq)\to\text{PbCl}_2(s)+2\text{NaNO}_3(aq)\) 3. \(…
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question 3 to dispense the liquid, you hold the digital pipette a) vert…
A. Vertically
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independent practice -- 8 problems (spa coefficients) 1. h₂ + cl₂ → __ …
1. \(2\) 2. \(1\) (already balanced) 3. \(4\), \(3\), \(2\) 4. \(2\), \(2\), \(3\) 5. \(2\), \(2\) 6. \(2\) 7. \(2\), \(9\), \(6\), \(6\) 8. \(5\), \(2\)
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if a solution appears yellow in colour, this means that the solution ab…
D. violet
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select the correct answer. what is the chemical name of the compound re…
B. nickel(III) oxide
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question 1 according to the beer - lambert law, absorbance is: a) inver…
B. Directly proportional to the concentration
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worked example (follow the steps and fill in the blanks) equation: ( h_…
## Worked example 1. Left — \(H = 2\), \(O = 2\); Right — \(H = 2\), \(O = 1\) 2. Oxygen (\(O\)) 3. \(2\) 4. Left — \(H = 2\), \(O = 2\); Right — \(H = 4\), \(O = 2\) 5. \(2H_2+O_…
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select the correct answer. what is the chemical name of the compound re…
B. nickel(III) oxide
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select the correct answer. what is the chemical formula for the compoun…
D. \(Mg(ClO_{4})_{2}\)
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lab data reactants appearance of reactants observations after mixing (s…
For \(NaOH(aq)+CuSO_{4}(aq)\): Observation - Solid formed in mixture; Products - \(Cu(OH)_{2}(s)\), \(Na_{2}SO_{4}(aq)\) For \(NaCl(aq)+Pb(NO_{3})_{2}(aq)\): Observation - Solid f…
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select the correct answer. what is the chemical formula for the compoun…
B. \(Mg(ClO_{4})_{2}\)
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1 ___h₂ + ___cl₂ → ___hcl 2 ___c₃h₈ + ___o₂ → ___co₂ + ___h₂o 3. ___zn …
1. \(1H_{2}+1Cl_{2}\to2HCl\) 2. \(1C_{3}H_{8}+5O_{2}\to3CO_{2}+4H_{2}O\) 3. \(1Zn + 1CuSO_{4}\to1ZnSO_{4}+1Cu\) 4. \(2KClO_{3}\to2KCl + 3O_{2}\) 5. \(4Fe+3O_{2}\to2Fe_{2}O_{3}\) 6…
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covalent compounds: mastery test 5 select the correct answer. what happ…
A. Each chlorine atom shares a pair of electrons with the sulfur atom.
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select the correct answer from each drop - down menu. covalent network …
Covalent network solids typically have high melting points and high boiling points. The chemical formula of a network solid indicates only the types of atoms and the ratio of the …
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3 select the correct answer. what is the chemical name of the covalent …
D. tetraphosphorus nonoxide
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drag the tiles to the correct locations. each tile can be used more tha…
Top blue square: \(N\) (with a lone - pair \(\cdot\cdot\) on \(N\)), middle blue square (connecting \(N\) and \(O\)): \(=\), bottom blue square: \(F\) (with three lone - pairs \(\…
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how many carbon atoms are represented in the formula for tricarbon octa…
3
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bacteria, viruses, protozoa, and parasitic worms are examples of which …
infectious agents
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organic waste is especially problematic because it uses large amounts o…
manure from livestock feeding operations
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1. using the following reactions, calculate the heat of formation, δhf,…
\(128.02\ kJ\)
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question 29 29/30 what is the effect of surface area on reaction rate? …
Larger surface area increases reaction rate.
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reactions involving ionic salt solutions naoh(aq) + cuso₄(aq) nacl(aq) …
For \(NaOH(aq)+CuSO_{4}(aq)\): - Observations: Solid formed in mixture - Products: \(Cu(OH)_{2}(s)\), \(Na_{2}SO_{4}(aq)\) For \(NaCl(aq)+Pb(NO_{3})_{2}(aq)\): - Observations: Sol…
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what is the relationship between concentration and reaction rate? highe…
Higher concentration increases reaction rate.
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what is one of the requirements for a chemical reaction to occur accord…
Sufficient energy and proper orientation of particles.
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review the details below. marie curie was hired as the first female phy…
Scientist Marie Curie achieved several important milestones during her career.
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what is one property of water that allows solid water to float on liqui…
ability to be most dense in liquid form
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choosing the correct tools choose the best tool for each scenario. iden…
graph
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is the reaction a double - displacement or single - replacement reactio…
The reactions \(NaOH(aq)+CuSO_{4}(aq)\) and \(NaCl(aq)+Pb(NO_{3})_{2}(aq)\) are double - displacement reactions. To determine solubility, use solubility rules (e.g., Group 1 salts…
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solid water floats on liquid water. why does this happen? ice is less d…
Ice is less dense than liquid water.
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when water changes to a gas at temperatures below the boiling point, wh…
Evaporation
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h3po4 + hcl → pcl5 + h2o
$$\text{H}_3\text{PO}_4 + 5\text{HCl} ightarrow \text{PCl}_5 + 4\text{H}_2\text{O}$$
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10. crime scene investigators want to test a dry knife for prints. whic…
- 10. B. Powder, C. Super - glue fuming - 11. A. Ninhydrin - 19. A. amino acids - 20. C. It can dissolve written evidence on the object - 21. C. Integrated Automated Fingerprint I…
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using the table on the right, complete each calculation by typing in th…
\(7.81\times 10^{-6}\)
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2. this occurs with the complete transfer of electrons from one element…
B. Ionic Bond
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4. nomme ou donne la formule chimique des substances suivantes : (8 poi…
a) $\text{Cr}_2\text{S}_3$ b) $\text{ZnO}$ c) $\text{H}_2\text{S}$ d) $\text{N}_3\text{O}_6$ e) Chlorure d'ammonium f) Trisulfure de diazote g) Hydroxyde de cuivre (I) h) Acide ca…
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1. a(n)__________ is a metal made by combining two or more metallic ele…
Alloy
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protons: neutrons: electrons: find the element:
Hydrogen (H)
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find the element: protons: 7 neutrons: 8 electrons: 10
\(N^{3 -}\)
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find the element: protons: 7 neutrons: 8 electrons: 7
Nitrogen (\(N\))
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11. how many orbitals are in the following sublevels? a) 3p sublevel = …
a) \(3\) b) \(1\) c) \(3\) d) \(5\) e) \(7\)
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find the element:
Helium (\(He\))
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c) combien datomes total se retrouve dans 284 g de na_so_? (5 points) d…
c) \(8,43\times10^{24}\ atomes\) d) \(5,25\ mol\)
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nutrition food and wellness 1 of 14 which type of contaminant is most l…
Microbial
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reactions involving ionic salt solutions naoh(aq) + cuso₄(aq)
Observations after mixing: Solid formed in mixture Products: \(Cu(OH)_{2}(s)\), \(Na_{2}SO_{4}(aq)\)
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a swollen uvula might interfere with which of the following? multiple c…
Deglutition and breathing
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3. calculs avec les relations molaires. montre ton travail. a) combien …
a) \( 0,00845\ mol \) b) \( 107,2\ g \)
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3. calculs avec les relations molaires. montre ton travail a) combien d…
a) \(\boldsymbol{8,45\times 10^{-3}\ mol}\) b) \(\boldsymbol{107,2\ g}\)
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which is the only element in group 1 on the periodic table that forms c…
hydrogen
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assess it! directions: answer each question below. 1. what is the small…
1. b) Atom 2. a) Proton 3. c) Protons 4. c) Groups 5. b) Carbon 6. a) 2 7. b) Electron 8. d) Atomic number 9. b) Similar chemical properties 10. c) Neon 11. c) Sodium 12. a) Oxygen
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four students are analyzing four different substances and recording the…
Leonna has a solid, Xiao has a liquid, Blake made a mistake, and Amir has a gas.
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2. équilibre les équations suivantes : (9 points) a) ___ sio₂ + ___ h₂f…
a) \(1SiO_2+2H_2F_2\to1SiF_4 + 2H_2O\) b) \(1C_2H_5OH+3O_2\to2CO_2+3H_2O\) c) \(2Al+3S\to1Al_2S_3\)
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how do the nuclei of covalently bonded atoms help keep the bond togethe…
Positive particles in the nucleus are attracted to shared electrons, so the atoms stay close together.
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which property of physical changes explains why matter is conserved in …
The bonds between atoms do not break; it is only the arrangement that changes.
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which formula represents charless law? $\frac{v_1}{t_1}=\frac{v_2}{t_2}…
\(\frac{V_1}{T_1}=\frac{V_2}{T_2}\)
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which element is least likely to form chemical bonds? phosphorus (p) he…
helium (He)
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when hydrogen peroxide bubbles, it is undergoing a chemical change. whi…
The atoms in hydrogen peroxide are breaking apart and forming new types of molecules.
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which element has fewer than four dots in its electron dot diagrams? ar…
gallium (Ga)
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marco wants to investigate the chemical properties of sodium bicarbonat…
Only Test 2 will indicate a chemical property of sodium bicarbonate. Tests 1 and 3 will show a physical property of the substance.
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11. trois grammes de substance a se combinent à quatre grammes de subst…
\(2\ g\) (Option B) ### Question 12
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15. what 2 pieces of info do you need to calculate the average atomic m…
1. The mass of each isotope of the element 2. The relative abundance of each isotope
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1 multiple choice 2 points what is the name of the technique set - up b…
Simple distillation
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chimie 1 evaluation sommatlve module 2 nom de lélève : josie ralves b. …
1. D. \(KOH\) 2. A. \(0,25\ moles\) 3. B. \(592\ g/mol\) 4. B. \(4HCl\) et \(MnO_2\) 5. C. \(1,20\times10^{24}\) atomes 6. B. le nombre d'atomes de chaque élément des réactifs ave…
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14. circle all that are true a. atoms are the smallest particles to ret…
a. Atoms are the smallest particles to retain the characteristics of the element (is True)