化学
化学反应、化学计量、分子结构与元素性质。
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occurs when heat is transferred through molecular or motion creates a c…
1. particle 2. gases 3. dense 4. conduction 5. disperse
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is the of heat from more energetic molecules to less energetic molecule…
transfer, thermal, solids, conducting, insulators, touching
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name: teacher: q2 chemistry: u3l7 successive ionization energy date: pr…
Lithium has a higher second ionization energy. Because after the first ionization, \(Li^{+}\) has a stable noble - gas (\(He\) - like) configuration (\(1s^{2}\)), and removing a s…
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chapitre 1.4 : changements physique... 1. un bouillon de poulet. (1 poi…
1. B. Mélange Hétérogène 2. A. Mélange Homogène 3. A. Mélange Homogène 4. B. Mélange Hétérogène 5. A. Mélange Homogène
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7. un verre de boisson gazeuse quon vient de verser. (1 point) mélange …
7. Mélange Homogène 8. Mélange Hétérogène 9. Mélange Homogène 10. Mélange Hétérogène
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5. leau pure est un mélange dhydrogène et doxygène. (1 point) vrai faux…
5. Faux 6. Faux
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2. un mélange homogène comporte une seule phase. (1 point) vrai faux 3.…
2. Vrai 3. Vrai 4. Vrai 5. Faux
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chapitre 1.4 : changements physique... chapitre 1.4 : changements physi…
Réversibles et conservent les propriétés des substances.
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0. la cire dune chandelle qui brûle à cause de la flamme. (1 point) cha…
Ce n'est pas un changement physique
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criss cross method/ionic formulas learning che what is the formula for …
C. \(CaF_{2}\)
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criss cross method/ionic formulas learning check identify if each compo…
\(CaCl_{2}\): ionic \(CO_{2}\): covalent \(H_{2}O\): covalent \(CH_{4}\): covalent \(CaS\): ionic \(LiBr\): ionic
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if you throw a rock into a still pond, a wave travels to the edge. whic…
The water molecules vibrate but stay in roughly the same place.
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analyzing the elements of a scientific method read the following story …
1. "It appears that salt water freezes at a lower temperature than fresh water." and "I suggest that the reason sea water freezes at a lower temperature is that sea water contains…
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match each statement to the type of behavior it describes. jackie eats …
| Responsible | Irresponsible | | --- | --- | | Hazel wears goggles while she breaks open rocks with a hammer. <br> Aaron accidentally breaks a test tube but cleans up the broken …
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3 moles of ethanol and 6 moles of ethylene glycol are mixed together to…
solute = ethanol; solvent = ethylene glycol
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which solution has the lowest concentration of ions present? o 1.0 m ag…
\(1.0M\ AgCl\)
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question 21 what volume of a 1.544 m solution contains 106.5 g of sodiu…
0.4858 L
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question 21 what volume of a 1.544 m solution contains 106.5 g of sodiu…
\(0.4858\space L\)
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what volume of solution will you get if you take 50.0 ml of a 12.0 m st…
480 mL
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consider the following solution. the purple dots represent the solute. …
The first option (the beaker with a lower volume of solution but a higher number of purple dots)
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identify the acid - base reaction. o there is no acid - base reaction. …
\(2HClO_{4}(aq)+Sr(OH)_{2}(aq)\to Sr(ClO_{4})_{2}(aq)+2H_{2}O(l)\)
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identify the oxidizing agent in the following reaction: kclo₂→kcl + o₂ …
Chlorine in \(KClO_2\)
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what is the oxidation state of oxygen in o₂? -1/2 +1/2 0 -2
\(0\)
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what volume of 0.830 m koh is needed to completely neutralize 50.0 ml o…
60.2 mL
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identify the strong acid in the following reaction, and then predict th…
\(HClO_4;H_2O(l)+NaClO_4(aq)\)
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give the net ionic equation for the reaction (if any) that occurs when …
\(Pb^{2 +}(aq)+2Cl^{-}(aq)\to PbCl_{2}(s)\)
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give the total ionic equation for the reaction (if any) that occurs whe…
\(2Li^+(aq)+S^{2 -}(aq)+Cu^{2+}(aq)+2NO_3^-(aq)\to CuS(s)+2Li^+(aq)+2NO_3^-(aq)\)
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question 11 select the correct set of (unbalanced) products for the fol…
\(Ba(NO_3)_2(aq)+H_2O(l)\)
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all of the following compounds are insoluble except ○ pbso₄ ○ mgso₄ ○ c…
$MgSO_4$
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what is beryllium hydroxide, be(oh)₂? ○ weak electrolyte, weak base ○ w…
weak electrolyte, weak base
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determine the percent yield when 56.35 g of co₂ are formed from the rea…
\(50.00\%\)
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what is the theoretical yield, in grams, of li₃n when the reaction begi…
\(50.2\space g\space Li_3N\) (the option \(50.2\space g\space Li_3N\) is correct)
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consider the following balanced reaction. if you begin with 10.00 grams…
\(O_2\) is the limiting reactant and \(11.25\space g\) of \(H_2O\) is formed.
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the reactant in excess in a chemical reaction is one that o is consumed…
is not consumed completely in a reaction.
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balance the following reaction. what is the stoichiometric coefficient …
\(4\)
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what is the chemical formula? (you have the charges/use the crisscross …
\(Ca_{3}(PO_{4})_{2}\) is the correct chemical formula. So the first option (\(Ca_{3}(PO_{4})_{2}\)) is the answer.
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using the chart below: what is the symbol for phosphate? po3^-3 po4^-3 …
\(PO_{4}^{-3}\)
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a single bar in a molecule structure represents... a single valence ele…
a shared pair of electrons.
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al³+p³-: what will be the formula for aluminum phosphide? aip al₃p₃ al₂p
A. AIP
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we already know that the symbol for aluminum is: al. what symbol would …
P (Phosphorous)
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subatomic particles from these experiments, scientists agree that all a…
Subatomic particles (electrons, protons, neutrons) have distinct charges and masses. Electrons are much smaller. Protons and neutrons stay in the nucleus. Our understanding of ato…
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worksheet: atomic structure use your notes from the atomic structure pr…
1. protons; neutral; negatively; electrons 2. protons; neutrons; nucleons 3. neutrons; mass 4. a. Hydrogen - 1, b. Hydrogen - 2, c. Hydrogen - 3 5. | Symbol | Atomic # | Mass # | …
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question 46 based on chemical structure, estrogen is an example of whic…
Steroid hormone
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question 38 mark this question in the tissues, the oxyhemoglobin gives …
Iron in heme groups.
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question 14 mark this question the contractions of which layer promotes…
Muscularis
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what do these two changes have in common? saliva breaking down a piece …
Both conserve mass. Both are chemical changes.
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what do these two changes have in common? water freezing into ice snowf…
- A. Both are only physical changes. - D. Both are caused by cooling.
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what do these two changes have in common? filtering air to remove dust …
A. Both are only physical changes.
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what do these two changes have in common? shaking up salad dressing pou…
Both are only physical changes.
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read the following excerpt from levitt and dubners freakonomics. drivin…
Feldman's payment system was largely successful.
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$125,000 question: which gas caused blisters all over the body? a. chlo…
B. Mustard Gas
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the diagram below shows calcium chloride. calcium chloride is a white s…
\(\ce{CaCl2}\)
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4* a student is using colored beads to make a model of magnesium hydrox…
B. 2 orange, 1 green, and 4 blue
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rbi the name of the compound shown above is rubidium iodine ×. the mole…
2 (total atoms), 1 (Rb atoms)
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which chemical reaction involves the most hydrogen atoms? a hc₂h₃o₂ + n…
C. \(6CO_{2}+6H_{2}O+\text{light} ightarrow C_{6}H_{12}O_{6}+6O_{2}\)
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read the excerpt from \the environmental ethic.\ it is fashionable in s…
All species are worth protecting because even the small organisms contribute important functions in the environment.
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20. list these diatomic molecular compounds in order of weakest (1) to …
\(Cl_2\) (1), \(O_2\) (2), \(N_2\) (3) ### Question 21
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which of the following is a correctly balanced equation? a. naclo3→nacl…
B. \( 2\text{HgO} ightarrow2\text{Hg}+\text{O}_2 \)
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20. list these diatomic molecular compounds in order of weakest (1) to …
1. \(Cl_2\) 2. \(O_2\) 3. \(N_2\)
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17. which is the lewis structure for silicon disulfide? a. :s::si::s: b…
A. \(:S::Si::S:\) ### Question 18
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which balanced equation involves 12 atoms of oxygen? a ( 5o_{2} ightarr…
C. \(4Fe + 3O_{2}\to2Fe_{2}O_{3}\)
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10. the central selenium atom in selenium hexafluo - ride forms an expa…
C. 6 11.
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q4 4. what is the name of (nh₄)₂c clear all ammonium carbonate ammonia …
ammonium carbonate
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read the sentence from an argumentative essay about chemical waste. the…
The chemical waste produced by factories is dangerous, and factory owners should be held accountable.
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3. how do cations form? electrons gain or lose energy as they change or…
Atoms lose one or more valence electrons.
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2. what is the formula for lithium bromide lbr libr li₂br libr₂
LiBr
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1. which is an example of lonic bonding? metal + non - metal two non - …
metal + non - metal
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how many neutrons are in a lithium atom?
$4$
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practice problems! now you try balancing some chemical equations for yo…
1. \(2K + 2H_{2}O=2KOH + H_{2}\) 2. \(2Al + 6HCl=2AlCl_{3}+3H_{2}\) 3. \(2AgNO_{3}+Ni = Ni(NO_{3})_{2}+2Ag\) 4. \(H_{3}PO_{4}+3KOH = K_{3}PO_{4}+3H_{2}O\)
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in covalent bonds, the atoms that form bonds a become ions. b transfer …
C. may both be the same element.
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a water molecule is held together by ____ covalent bonds, meaning there…
E. 2,4
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nitrogen is a diatomic element with _____ valence electrons. a five b t…
A. five
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which statement(s) is/are true about covalent bonds? select all that ap…
A. Covalent bonds can form between atoms of the same element. C. Covalent bonds can form between atoms of different elements. E. Covalent bonds can form between two nonmetal atoms.
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which of the following represent compounds? select all that apply a co₂…
A. \(CO_2\), D. \(NaCl\)
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13. which list includes elements with the most similar chemical propert…
C. Be, Mg, Ca
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17. which statement describes the general trends in electronegativity a…
17. b) Electroncgativity and first ionization energy both increase. 18. b) Metallic properties and atomic radii both increase.
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24. an atom of which element has the strongest attraction for the elect…
D. fluorine
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complete the sentence by using word ion, molecule, atom or element. a(n…
molecule
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which of the following represents a covalent molecule? select all that …
A. \(H_2O\), C. \(Cl_2\), E. \(O_2\)
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21. compared to a nitrogen atom, a n³⁻ ion has a) more electrons and a …
21. a) more electrons and a larger radius 23. c) \(Co(NO_{3})_{2}\)
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read this prompt create a multimedia presentation for the claim that co…
On average, 83 million people are added to the world's population every year.
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2. which 2 of the following gases were formed during the combustion rea…
Carbon dioxide, Water vapor
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elements that form diatomic molecules include ________. a oxygen b hydr…
D. two of the above
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jena is doing research for a presentation about pesticides in the fruit…
a university site showing the results of a study on which foods absorb chemicals
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elements that form diatomic molecules include ________. a carbon b oxyg…
B. oxygen
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which best demonstrates proper organization in a body paragraph? select…
However, the risks outweigh the benefits.
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1. which molecule contains a double bond? a. c₃h₈ c. c₂h₄ b. cf₄ d. sf₂…
c. \(C_2H_4\) ### 2.
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positive ions are named by adding the suffix --ide to the first part of…
B. FALSE
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metals (m) in group 2 of the periodic table form ionic bonds with nonme…
B. 16
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how do ionic bonds form? a atoms of metallic elements give up electrons…
A. atoms of metallic elements give up electrons to atoms of nonmetallic elements
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when representative elements form ionic compounds, which elements achie…
d. metals and nonmetals
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which two elements would not be capable of forming an ionic bond? a pho…
a. phosphorus and chlorine
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5. proteins are a * chemical reaction molecule atom
C. Molecule
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every compound can be represented by a chemical formula. a chemical for…
B. Every molecule of a compound has the same proportion of elements.
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elements and compounds are pure substances that cannot be broken down p…
C. running an electric current through water
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another pure substance, compounds contain atoms from two or more elemen…
A. They can only be separated chemically.
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elements are one type of pure substance. in an element, every atom is t…
B. Oxygen atoms have fewer protons than chlorine atoms.
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select the correct answer. why are zoroastrian bodies traditionally pla…
C. to purify the body with the sun and provide food for flying scavengers
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bladder fullness is to______ as blood ph is to______. nociceptors; ther…
baroreceptors; chemoreceptors
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receptors that monitor the position of joints are thermoreceptors. baro…
proprioceptors.