Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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a chemical species that is present but does not directly participate in…
Spectator
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21. the statue of liberty wasnt always green; through oxidation, copper…
chemical
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what is the correct reaction for when copper and concentrated nitric ac…
\(\text{Cu}(s)+4\text{HNO}_3(aq)\to\text{Cu}(\text{NO}_3)_2(aq)+2\text{H}_2\text{O}(l)+2\text{NO}_2(g)\)
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a gaseous mixture contains 403.0 torr h₂(g), 331.1 torr n₂(g), and 86.1…
\(x_{H_2}=0.491\), \(x_{N_2}=0.404\), \(x_{Ar}=0.105\)
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20. the characteristic of a substance that can be observed without chan…
physical
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which of these are signs that a chemical reaction has taken place? sele…
All of the above.
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an unknown gas at 51.1°c and 1.00 atm has a molar mass of 30.07 g/mol. …
\(1.13g/L\)
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19. a(n)__________change absorbs energy.
endothermic
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18. the form or appearance of matter is altered during a(n) change.
physical
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which of these is not a type of chemical reaction? select one: decompos…
Triple replacement
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multiple - choice question what is work? the movement of atoms and mole…
C. None of the above
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an open flask sitting in a lab refrigerator looks empty, but it is actu…
\(1.21\times 10^{23}\)
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question 9 of 18 a sample of an ideal gas has a volume of 3.15 l at 11.…
\(5.0\space L\)
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if an ideal gas has a pressure of 6.59 atm, a temperature of 38.90°c, a…
\(12.2\) (rounded to three significant figures)
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if 3.62 mol of an ideal gas has a pressure of 2.33 atm and a volume of …
\(325^{\circ}C\)
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16. the law of of mass states that in any physical or chemical change,…
conservation
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if 22.5 mol of an ideal gas is at 6.53 atm at 97.50 °c, what is the vol…
\(105\text{ L}\)
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a flexible container at an initial volume of 3.10 l contains 9.51 mol o…
\(36.2\)
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15. new substances are produced by a(n) ______________ change.
chemical
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a sample of an ideal gas at 1.00 atm and a volume of 1.49 l was placed …
\(0.0271\)
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apply the concepts word bank: (3)physical, (2)chemical, thermal, conser…
exothermic
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classifying changes identify the type of change or changes that apply t…
9. B 10. C 11. P 12. P 13. C
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7. explain why can a melted ionic compound conduct electricity, but a s…
Un compuesto iónico sólido no puede conducir electricidad porque los iones están en una red cristalina y no pueden moverse libremente. En cambio, cuando se funde, los iones se lib…
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4 indique si le nombre appartient (∈) ou nappartient pas (∉) aux ensemb…
\(\frac{2}{3} otin D\), \(1,\overline{3} otin N\), \(3,215 otin Q'\), \(0\in N\), \(\sqrt{-1} otin R\), \(5,3\overline{4}\in Q\), \(-\frac{8}{9}\in Q\), \(2\div0 otin R\), \(…
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1. how many elements are present in the compound: na₂s₂o₃ a. 2 b. 3 c. …
1. B. 3 2. C. 5 3. D. 10
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6. explain why is the chemical formula for sodium chloride nacl, and no…
La fórmula química \(NaCl\) se escribe así porque el sodio (\(Na\)) tiene un estado de oxidación \(+1\) y el cloro (\(Cl\)) tiene un estado de oxidación \(-1\). En \(NaCl\), la ca…
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electromagnetic spectrum color by numbers directions: answer each quest…
1. A. radio waves (yellow) 2. C. visible light (red) 3. A. increases (yellow orange) 4. B. electromagnetic waves do not require a medium (blue) 5. C. gamma rays (red orange) 6. A.…
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looking closer 4. identify in sodium chloride, which ion is negatively …
4. El ion \(Cl^{-}\) es negativamente cargado y el ion \(Na^{+}\) es positivamente cargado. 5. Ambos \(Na^{+}\) y \(Cl^{-}\) tienen sus orbitals outermost llenos con 8 electrones.
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complete the text with the better conjunctive adverb. when electronic w…
Therefore
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2. compare how do the structures of ionic and covalent compounds differ…
2. Los compuestos iónicos tienen una estructura de red cristalina formada por iones (cargados), unidos por fuerzas electrostáticas. Los compuestos covalentes tienen una estructura…
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reading toolbox compare as you read, make a chart that describes and co…
Los átomos se unen para formar enlaces químicos para alcanzar una configuración electrónica estable, similar a la de los gases nobles. Esto se logra a través de la transferencia o…
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what cannot be broken down into other substances? mixture compound elem…
Element
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when two or more substances combine, but each keeps its own properties,…
mixture
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is sugar (c₁₂h₂₂o₁₁) an element or a compound?
Compound
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compound mixture element salt water (nacl & h₂o) is an example of an
mixture
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12.) determine the number of ml of 0.246 m agno₃ required to precipitat…
$156\ mL$
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element which one can be found on the periodic table? 7/20 compound
Element
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what type of substance is being modeled here?
Compound
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water (h₂o), is not found on the periodic table because water is a... l…
compound
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3.) if a 3.45 ml sample of vinegar needs 42.5 ml of 0.115 m naoh to be …
\(85.0\space g\)
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compound element homogeneous mixture heterogeneous mixture kool - aid i…
Homogeneous Mixture
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elements and compounds are both made up of different kinds of atoms. el…
Elements and compounds are pure substances.
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2 or more substances that are together in the same place, but their ato…
Two or more substances that are together in the same place, but their atoms are not chemically bonded.
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element compound mixture contains more than one type of atom held toget…
Compound
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what can be predicted from the valence electrons of the elements in a c…
bond type between the atoms
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8. a lightweight silver - white metal a. iron b. aluminum c. ferromagne…
B. aluminum
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which term describes the conversion of substances into different substa…
chemical reaction
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which chemical formula represents a polyatomic ion? (1 point) cl- clo- …
B. ClO−
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use the periodic table to answer the question. based on patterns in the…
potassium (K) with a \(1^{+}\) charge
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6. a hard, silver - white magnetic metal, easily rusts in moist air a. …
B. Iron
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which statement best explains why the elements in group 18 do not have …
The elements have filled valence levels.
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which quantity determines how two atoms bond? (1 point) the sum of thei…
the difference in their electronegativities
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relative electronegativity quick check 1 of 5 use the periodic table to…
It would gain three electrons.
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3. a common reddish brown metal a. copper b. nickel c. repel d. ferroma…
A. copper
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how does rb bond with other elements? (1 point) rb loses two electrons.…
B. Rb loses an electron.
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2. a bright silver - white metallic element, resistant to corrosion a. …
C. nickel
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which of the following combination of elements is the most reactive? (1…
C. Cs and Br
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which feature is unique to group 18 nonmetals? (1 point) they are very …
They are very nonreactive.
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how do nonmetals tend to form bonds? (1 point) by losing electrons by g…
by gaining electrons
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why does the reactivity of metals increase from right to left on the pe…
Metals on the right have more protons, causing valence electrons to be held more strongly.
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use the image to answer the question. electronegativity which statement…
Fe and S are ionically bonded, while S and O are covalently bonded.
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bonding of atoms in reactions quick check 4 of 5 which statement best e…
B. Polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally.
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bonding of atoms in reactions quick check 3 of 5 which option contains …
\(KNO_3\)
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use the image to answer the question. electronegativity this image show…
fluorine (F)
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which statement is true? (1 point) molecules are added and removed duri…
Atoms always remain intact during chemical reactions.
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in hydrogen peroxide $(h_{2}o_{2})$, which option best shows how the at…
H-O-O-H
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methanes chemical formula is ch₄. is there a bond between any of the hy…
No, there is not because carbon needs four bonds, so it bonds with each hydrogen atom; hydrogen only forms one bond.
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use your knowledge of valence electrons and how they affect bonds to fi…
B. O=C=O
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how do valence electrons impact the type of bonds an atom makes? (1 poi…
B. An atom wants a full outer shell of valence electrons, so it will either transfer or share electrons depending on what the other atom needs.
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how many electrons does hydrogen have in its valence shell when it is f…
two
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patterns of attraction quick check 4 of 5 combustion reactions release …
light, carbon dioxide, and water
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use the reactivity series to answer the question. most reactive potassi…
C. sodium
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use the periodic table to answer the question. a reaction occurs that r…
N₂
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which statement best explains why carbon bonds to four hydrogen atoms t…
C. Hydrogen shares one valence electron with carbon, and oxygen shares two valence electrons.
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use the periodic table to answer the question. which atom generally obt…
A. phosphorus (P)
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how many valence electrons do most stable atoms have? (1 point) one fou…
C. eight
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use the periodic table to answer the question. based on location in the…
A. fluorine (F)
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use the table to answer the question. elements with their electronegati…
C. bromine and nitrogen
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covalent and ionic bonding quick check 4 of 5 which phrase best describ…
the relative strength with which an element attracts electrons in a chemical bond
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use the periodic table to answer the question. based on their locations…
nitrogen (N) and oxygen (O)
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covalent and ionic bonding quick check 2 of 5 which statement about sod…
The sodium atom transfers electrons to the chlorine atoms to form ionic bonds.
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practice 4 arrange the transformations in the correct order. 1. light t…
1. Light the match to start the candle. 2. The candle burns the string into two pieces, releasing the ball that was being held in place. 3. The ball rolls down the ramp and hits t…
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covalent and ionic bonding quick check 1 of 5 use the periodic table to…
B. rubidium (Rb)
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2h₂ + 1o₂ →→ 2h₂o if you change the 2h₂ to 3h₂ molecules and balance th…
C. It is not possible to produce water without leftover molecules.
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it takes 1 molecule of nitrogen and 3 molecules of hydrogen to produce …
\(2N_2\) and \(6H_2\)
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which statement correctly explains why the ashes of burnt paper have le…
B. Some of the atoms in the paper became gases.
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one molecule of calcium oxide, cao, and one molecule of carbon dioxide,…
B. \(CaCO_3\)
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a student runs two experiments with a constant - volume \bomb\ calorime…
\(- 1038\space kJ/mol\), exothermic
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when iron rusts and forms iron oxide, the iron oxide has more mass than…
Iron oxide has oxygen atoms, and pure iron does not.
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practice 2 match the type of energy to its description. electrical ener…
Electrical Energy - A type of energy involving charged particles. Mechanical Energy - Energy of motion. Chemical Energy - A type of energy involving the bonding of atoms. Gravitat…
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ap chemistry successive ionization energy question (you can do it!)the …
Element 3 is magnesium (\(Mg\)). # B.
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analyzing the elements of a scientific method read the following story …
c and d.
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maltose is a disaccharide found mostly in the seeds of wheat, oats, ric…
Maltose is a disaccharide made of the two glucose. Compared to lactose and sucrose, maltose has the same number of carbon, hydrogen, and oxygen atoms.
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water molecules are also attracted to other kinds of molecules. this is…
cohesive; weaker; adhesive
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water can travel up a glass tube against the force of gravity! this is …
Adhesive forces cause water molecules to stick to the glass molecules in the tube. Cohesive forces between water molecules hold the molecules together. When adhesive forces are gr…
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which of the following represents a covalent molecule? select all that …
A. \(CO_2\), B. \(Cl_2\), C. \(O_2\)
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water is made of one oxygen atom covalently bonded to two hydrogen atom…
In a molecule of water, the oxygen atom shares **electrons** with each hydrogen atom. Oxygen also has **two** nonbonding pairs of valence electrons. Because valence electrons are …
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read the excerpt from act 1, scene 5 of the tragedy of macbeth. lady ma…
It reminds Macbeth of the need to appear as a welcoming host to conceal his evil plans.
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5. in general, does the orientation of colliding molecules affect wheth…
5. Yes, the orientation of colliding molecules affects whether a reaction occurs. 6. Activation energy. 7. Activated complex (or transition state).
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worksheet: chemical bonding - ionic & covalent! remember... ionic bond …
| Compound | Element 1 (metal or non - metal?) | Element 2 (metal or non - metal?) | Bond Type | |---|---|---|---| | \(NO_{2}\) | \(N=\) non - metal | \(O=\) non - metal | covalen…