Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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the passage below describes an experiment. when baking soda and vinegar…
Does the type of vinegar added to baking soda affect how long the mixture bubbles?
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part a. instructions: for each of the following descriptions, identify …
1) Physical property 2) Chemical property 3) Physical property 4) Physical property 5) Physical property 6) Chemical property 7) Physical property 8) Chemical property 9) Physical…
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11. explain what electronegativity is measuring and describe the patter…
Electronegativity measures an atom's electron - attracting ability in a bond. The pattern is that it increases across a period and decreases down a group. Draw arrows pointing lef…
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2. prepare 45 ml of 0.15 m naoh from 0.8 m naoh solution 3. you add 30 …
2. Take 8.44 ml of 0.8 M NaOH solution and dilute to 45 ml. 3. 11 4. $\frac{1}{50000}$ 5. Dilution factor: $\frac{1}{1250}$, Concentration: 0.0032 M, Volume: 1.25 L
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clicker question which of the following does not affect the rate (speed…
B. The energy difference between reactants and products
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10. explain what atomic radius is measuring and describe the pattern. d…
Atomic radius measures the distance from the nucleus to the outermost electron shell. The pattern is that it decreases across a period and increases down a group. Arrows should be…
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q 14. elements on the periodic table are arranged so that there is a re…
D. properties
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match the trend to the correct description of its pattern. electronegat…
Electronegativity: Increases across a period and decreases down the group. Most noble gases do not have a value for this. Ionization Energy: Increases across a period and decrease…
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convert moles to grams in each of the following: 11. 1.5 moles nh₃ 12. …
11. 25.6 g 12. 63.8 g 13. 172 g 14. 106 g 15. 103 g 16. 100 g
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short answer questions 7. explain how the periodic table is organized a…
The periodic table arranges elements by increasing atomic number. Elements in the same group have similar properties due to the same number of valence electrons. ### 8.
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16. consider the following lewis dot structure: element x is most likely
B. Oxygen
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hypothesis. hint: to test the hypothesis, you use experiments or observ…
Kenny's initial hypothesis that liquids with high boiling points are very cohesive was disproven by his experiment. Other factors such as molecular weight and molecular shape also…
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match the trend to the correct description. the amount that an atom pul…
- The amount that an atom pulls on electrons when it shares them in a molecule: Electronegativity - The energy required to remove an electron from a neutral atom: Ionization Energ…
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extra credit: the horizontal rows of the periodic table of elements are…
Periods
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17. the elements of the noble gas family, except for helium, have an ou…
B. 8 electrons
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by changing the number of protons in an element you can change the? o a…
name of the element
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which element has the largest electronegativity in each pair? 1. sodium…
1. Sodium 2. Phosphorus 3. Magnesium 4. Fluorine
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which element has the largest ionic size in each pair? 1. al or al^3+? …
1. Al 2. S²⁻ 3. Na 4. I⁻
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ions are atoms with a charge. one charge is positive. one is negative. …
C. Cation, A. Anion
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which element has the largest ionic size in each pair? 1. mg or mg2+? 2…
1. Mg 2. O²⁻ 3. Li 4. Cl⁻
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the passage below describes a process of scientific inquiry. select the…
Did that mean that detergents kept liquids from holding together?
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which element has the largest ionization energy in each pair? 1. sodium…
1. Sodium 2. Phosphorus 3. Magnesium 4. Fluorine
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choose what the best description of a non - metal. ¿qué es la mejor des…
High electronegativity, Poor conductors of heat
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which element has the largest ionization energy in each pair? 1. lithiu…
1. Lithium 2. Silicon 3. Magnesium 4. Oxygen
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which element has the largest atomic radius in each pair? 1. lithium or…
1. Cesium 2. Aluminum 3. Radium 4. Carbon
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objectives: differentiate between the subatomic particles in an atom in…
1. a. How does the charge of a sub - atomic particle affect its location in an atom?; What is the relationship between the number of sub - atomic particles and the stability of an…
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11. which of these elements would have the lowest ionization energy?
A. Option A (assuming Option A represents the atom with the largest atomic radius among the given choices based on the electron - shell diagrams)
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10. which of the following pairs of elements are likely to have the mos…
Ba and Mg
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element atomic radius electronegativity sr 255 pm 0.95 rb? ? 9. based o…
290 pm, 0.82
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what element could this lewis dot diagram be showing? choose all that a…
Carbon
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suppose an element with an atomic number of 119 and symbol q was discov…
+1
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fill in the systematic names of the following chemical compounds. note:…
| molecular formula | name of compound | | ---- | ---- | | $BrO_2$ | bromine dioxide | | $CO_2$ | carbon dioxide | | $Br_2O$ | dibromine monoxide | | $CO$ | carbon monoxide | | $H…
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for a neutral atom the atomic number tells you what? ¿qué te indica el …
Number of protons
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a model of the electron cloud in the hydrogen fluoride molecule, hf, is…
The electronegativity of fluorine is greater than the electronegativity of hydrogen.
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5. which of the following has the most metallic properties? n bi as p
Bi
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the group 6a elements are referred to as the chalcogens. which of the f…
O
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the arrow on the periodic table above could illustrate which of the fol…
I, IV
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physical vs chemical properties a physical property is observed with th…
| Property | Physical Property | Chemical Property | | --- | --- | --- | | 1. blue color | √ | | | 2. density | √ | | | 3. flammability | | √ | | 4. solubility | √ | | | 5. reacts…
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why is an ion of lithium is larger than an ion of beryllium? lithium io…
Lithium ions have fewer protons than beryllium ions, so lithium ions have a smaller nuclear attraction to the valence electrons.
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fill in the systematic names of the following chemical compounds. note:…
| molecular formula | name of compound | | ---- | ---- | | $CS_2$ | carbon disulfide | | $BP$ | boron phosphide | | $C_3S_2$ | tricarbon disulfide | | $BI_3$ | boron triiodide | |…
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1. blue color 2. density 3. flammability 4. solubility 5. reacts with a…
| Property | Physical Property | Chemical Property | | --- | --- | --- | | 1. blue color | X | | | 2. density | X | | | 3. flammability | | X | | 4. solubility | X | | | 5. reacts…
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metals have these properties. choose all that apply. usually solid at r…
Good conductor of electricity, Usually solid at room temperature, Malleable, Ductile
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the electron dot diagrams of calcium and magnesium are shown. ca : calc…
Both elements are in the same group on the periodic table.
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¿qué pasa cuando un átomo gana un electrón? the atom loses a proton. th…
The atom becomes negatively charged.
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the circle on the left is a representation of the size of a chlorine, c…
Circle A
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chemical equilibrium is a state reached when the concentrations of reac…
C. remain constant over time.
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8. explain the trend that both atomic radius and ionic radius increase …
As you move down a group, the number of electron - shells increases, leading to a greater distance between the outermost electrons and the nucleus, and the shielding effect of inn…
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i dont understand the periodic table of elements. can you explain why t…
Elements on the left side of the periodic table give away electrons because they have fewer valence electrons, lower ionization energy, and weaker effective nuclear charge. Elemen…
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fill in the systematic names of the following chemical compounds. note:…
Nitrogen monoxide Dinitrogen pentoxide Nitrogen dioxide Dinitrogen tetroxide Water
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the lewis model shows the electrons in an atom. the bohr model shows of…
The Lewis model shows **valence - shell** electrons in an atom. The Bohr model shows **number** of electrons and their **energy levels** in the atom.
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fill in the systematic names of the following chemical compounds. note:…
1. Phosphorus trichloride 2. Dichlorine heptoxide 3. Dichlorine trioxide 4. Phosphorus pentachloride 5. Ammonia
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23. the type or types of energy that batteries contain or store (within…
A. chemical or electric
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______ means that when we wrote the database, the design was establishe…
B. Schema - on - write
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select the three elements from the list that are most likely to be foun…
B. carbon, C. hydrogen, D. nitrogen
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1. click launch simulation. click \level 1\. 2. explain the strategies …
One strategy is to start with the most complex - looking compound and adjust coefficients to balance atoms one by one. Another is to balance elements that appear in only one compo…
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questions 1. what is an acid? 2. what is a base? 3. what is the ph scal…
1. A substance that donates hydrogen - ions (H⁺) in solution, has a pH less than 7, and reacts with bases to form salts and water. 2. A substance that accepts hydrogen ions (H⁺) o…
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modern cars have devices that combine oxygen with carbon monoxide, a to…
| Chemical element | Number of atoms in the reaction | | ---- | ---- | | C | 12 | | O | 24 | 12
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acid, base, or both? acids bases answer bank can be tested by indicator…
Acids: Produce $H_3O^+$ ions, Taste Sour, Turn blue litmus to red, React with metals to produce hydrogen gas Bases: Produce $OH^-$ ions, Feels slippery, Taste bitter, Turn red lit…
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6. select the statement that describes the \combust methane\ balanced e…
1 molecule of methane reacts with 2 molecules of oxygen to produce 1 molecule of carbon dioxide and 2 molecules of water.
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sulfuryl chloride is a substance used to make chemicals for killing ins…
| Chemical element | Number of atoms in the reaction | | ---- | ---- | | O | 10 | | S | 5 | | Cl | 10 | Number of $SO_2Cl_2$ molecules that react: 5
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4. lets try another reaction. click on \combust methane\ at the bottom …
| Element | Reactants atoms | Products atoms | | ---- | ---- | ---- | | carbon | 1 | 1 | | hydrogen | 4 | 4 | | oxygen | 4 | 4 |
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sulfur dioxide is a gas released when volcanoes erupt. it can react wit…
| Chemical element | Number of atoms in the reaction | | ---- | ---- | | O | 24 | | S | 8 | 8
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2. complete the following table for the balanced \separate water\ react…
| Element | Reactant atoms | Product atoms | | ---- | ---- | ---- | | Hydrogen | 4 | 4 | | Oxygen | 2 | 2 |
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the energy stored in a wooden log transforms when the log is burned. wh…
The chemical energy is equal to the amount of heat, light, and other applicable energies.
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place each substance on the ph scale
Stomach acid: 1 - 3; Vinegar: 2 - 3; Pure water: 7; Milk: 6.3 - 6.6; Ammonia: 11 - 12; Baking soda: 8 - 9; Drain cleaner: 13 - 14
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look at the models of molecules below. select all the elementary substa…
Bromine, Cyclooctasulfur, Oxygen
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sort the acids & bases answer bank hcl naoh koh h₃po₄ ca(oh)₂ nh₃ h₂so₄…
Acids: $HCl$, $H_3PO_4$, $H_2SO_4$, $HC_2H_3O_2$ Bases: $NaOH$, $KOH$, $Ca(OH)_2$, $NH_3$
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calculate the ph of a solution if oh⁻ = 1.0 x 10⁻¹. place a check mark …
pH = 13 BASE
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calculate the ph of a solution if oh⁻ = 1.0 x 10⁻¹². place a check mark…
pH = 2 ACID
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calculate the ph of a solution if h₃o⁺ = 1.0×10⁻¹¹. place a check mark …
$pH = 11$, BASE
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calculate the ph of a solution if h₃o⁺ = 1.0 x 10⁻⁷. place a check mark…
$pH = 7$ NEUTRAL
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question 2 1 pts physical properties can be used to compare and classif…
solubility
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look at the models of molecules below. select all the elementary substa…
Fluorine
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look at the models of molecules below. select all the elementary substa…
Hydrogen, Iodine
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look at the models of molecules below. select all the compounds. bromin…
B. water, C. iodine monochloride, E. carbon monoxide, F. hydrazine
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calculate the ph of a solution if h₃o⁺ = 1.0 x 10⁻⁵. place a check mark…
$pH = 5$ ACID
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look at the models of the substances below. select all the elementary s…
Silicon, diamond, alpha - tin, graphite
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look at the models of the substances below. select all the compounds.
Gallium arsenide, Silicon carbide
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9. now lets think about the two sides of the balances. identify what th…
The nitrogen atoms in the reactants.
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8. now lets look at one of the other tools in the simulation for repres…
The balance on the left shows the nitrogen atoms.
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7. in every chemical equation, the reactants are shown to the left of t…
B. $NH_3$
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what type of attraction is found between water molecules? a ionic bonds…
D. Hydrogen Bonds
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what does that mean? a molecule with identical charges on opposite ends…
D. It is a molecule with opposite charges on opposite ends.
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“look before you eat—and see if you can discover any unadulterated food…
The federal government regulated the food industry in order to protect the health of the public
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6. change the coefficient for hydrogen by clicking the up arrow next to…
Hydrogen atoms
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water is a universal solvent because it a floats when frozen b dissolve…
B. dissolves more substances than anything else.
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which of the following has a crystalline appearance? baking soda salt b…
B. salt
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given the data shown, what two substances react with vinegar? hint: (+)…
Baking Powder, Baking Soda
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a substance is tested with litmus paper. the blue litmus paper remains …
The substance is neutral; it is neither an acid nor a base.
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given the data below, what substance does not show a reaction for any o…
Salt
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14. how do the properties of water weather (break down) rocks? how do t…
Water weathers rocks physically by freezing and expanding in cracks and chemically by dissolving minerals. Flowing water erodes rock features on land by carrying away rock - fragm…
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short answer: 1. haikus are three - line japanese poems where the first…
1. Electrons they do share, In pairs they come together, Making bonds so fair. 2. Name: Sucrose, Molecular formula: $C_{12}H_{22}O_{11}$, Empirical formula: $C_{12}H_{22}O_{11}$ 3…
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problem using a bunsen - burner, a set of known chemicals, and an unkno…
1. Characteristic properties; Properties unique to a substance that can be used for identification. 2. Non - characteristic properties; Properties common to many substances that d…
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match the definition: operating an illegal business or scheme to obtain…
1. A. Racketeering 2. B. Money Laundering
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10. why do containers sometimes break in the freezer? they dissolve in …
Water's volume increases as it freezes.
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the davis family grows organic vegetables to sell at a local farmers ma…
- an increase in the cost of farm equipment - a rise in demand for organic produce - an increase in customers at the market
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some engines run on diesel fuel (c12h24), which provides some advantage…
The mole ratio of diesel to oxygen is $1:18$ and the mole ratio of diesel to carbon dioxide is $1:12$.
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question 2 (2 points) listen which of the following explanations best d…
A. Chemical energy is converted into thermal energy through combustion, and thermal energy is then transformed into mechanical energy in a steam engine.
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8. if substance a has a higher specific heat capacity than substance b,…
Substance A requires more energy to change its temperature than substance B.
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using the balanced equation 2 c8h18 + 25 o2 → 16 co2 + 18 h2o for the c…
The mole - ratio of octane to oxygen is $2:25$ and the mole - ratio of octane to carbon dioxide is $1:8$.