Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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8 the molecules in the liquid water begin to move faster and faster all…
1. Energy in the form of heat is added to a pot of room - temperature liquid water. 2. The molecules in the liquid water begin to move faster and faster. 3. Steam forms as the att…
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ferdinand tonnies would view hunting - and - gathering societies as exa…
A. Gemeinschaft
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question 10 0.5 pts on your certified organic farm, you grow a variety …
Start selling your seasoning mixes to the public at farmers' markets in the area.
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in each of the molecules drawn below one chemical bond is colored red. …
1. The highlighted bond is polar and the more negative atom is F 2. The highlighted bond is polar and the more negative atom is N 3. The highlighted bond is polar and the more neg…
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re - order each list of elements in the table below, if necessary, so t…
O, Se, As; F, Cl, I
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6 fill in the blanks to complete the sentences. not all the words used.…
When heated, the closely packed and tightly bound molecules of a solid move more quickly. Eventually, they break loose from their structure and become a liquid. As the molecules m…
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1 what happens to waters chemical makeup when it changes state? a water…
D. Its chemical makeup stays the same
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6 why dont solids take the shape of their container? a they have a fixe…
B. Their molecules are arranged in a rigid structure
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guide questions: 1. which glassware would you select if an experiment r…
1. A volumetric pipette because it is designed for delivering a specific, accurate volume. 2. It can leak, break further, cause injury, or contaminate reactions. 3. They have more…
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5 classify each of the following as describing the molecules in a solid…
Solid: vibrating slowly, close together Gas: spread out, moving quickly
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1 what happens to waters chemical makeup when it changes state? a water…
D. Its chemical makeup stays the same
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guide questions: 1. which glassware would you select if an experiment r…
1. A volumetric pipette because it is designed for delivering a single, precise volume. 2. It can leak chemicals, break further, cause injury, or contaminate reactions. 3. They ha…
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b. how many stereoisomers are possible for this monosaccharide? an erro…
4
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a. how many stereocenters are present in this monosaccharide?
1
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give the correct names for the types of sugars s a. cho ho—c—h ho—c—h c…
Glyceraldehyde
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guide questions: 1. why is laboratory attire (ppe) non - negotiable in …
1. Protects against chemical and physical hazards. 2. Rinse with large amounts of water to reduce damage. 3. To prevent ingestion of contaminated food/drinks. 4. Ensure safety, id…
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re the correct names for the types of sugars shown a. cho ho c h ho c h…
Glyceraldehyde
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what is the pressure of 4 moles of helium in a 50 l tank at 308 k? use …
D. 2.02 atm
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what is the partial pressure of a gas in a mixture of gases? a. the sum…
C. The pressure exerted by one gas in a mixture
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question 4 of 10 what is stp? a. the conditions of 0°c and 1 atm pressu…
A. The conditions of 0°C and 1 atm pressure
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which of the following is an expression of avogadros law (k = constant)…
B. $V = kn$
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what kind of reaction is symbolized by ab + c → cb + a? a. double repla…
C. Single replacement
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what information does a molecular formula give? a. the order in which a…
C. The actual number of atoms in a molecule
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what is molarity a measure of? a. density b. volume c. mass d. concentr…
D. Concentration
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what does the vsepr theory predict? a. valence electrons will pair up w…
D. Valence electron pairs will move as far apart from each other as possible.
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which term describes a change that occurs with no new substances being …
A. Physical change
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which of the following represents c4h10?
A.
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what is the correct name for na₂o? a. sodium dioxide b. disodium oxide …
C. Sodium oxide
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which of the following equations is balanced? a. na₂so₄(aq) + cacl₂(aq)…
B. \(Na_2SO_4(aq)+CaCl_2(aq) ightarrow CaSO_4(s) + 2NaCl(aq)\)
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what is stoichiometry used for? a. to determine the atoms in a formula …
D. To determine the amount of a substance
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question 1 of 10 a steam engine depends on what kind of energy conversi…
C. Heat energy to kinetic energy
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what is the molarity of 2 moles of a compound dissolved in 4 l of water…
B. 0.5 M
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in the reaction mgcl₂ + 2koh → mg(oh)₂ + 2kcl, how many moles of koh re…
A. 2
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what information do the coefficients of a balanced equation give about …
D. The coefficients give the molar ratio of the reactants.
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which equation shows how to calculate how many grams (g) of mg(oh)₂ wou…
A. $\frac{4\ mol\ KOH}{1}\times\frac{1\ mol\ Mg(OH)_2}{2\ mol\ KOH}\times\frac{58.31\ g\ Mg(OH)_2}{1\ mol\ Mg(OH)_2}$
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what is the average atomic mass of an element with isotopes a, b, and c…
C. (mass of A) × (% of A) + (mass of B) × (% of B) + (mass of C) × (% of C)
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why is the average atomic mass used when calculating grams of a substan…
A. The elements in the substance are mixtures of their isotopes.
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question 4 of 10 what is the theoretical yield of a reaction? a. the am…
D. The amount of product that is possible in a reaction
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what determines the effect of a limiting reagent on the mass of a produ…
B. The amount of the limiting reagent
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in the reaction mgcl₂ + 2koh → mg(oh)₂ + 2kcl, if 1 mole mgcl₂ is added…
C. $MgCl_2$
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how is stoichiometry used to calculate amount of product from amount of…
B. The coefficients give the ratio of moles reactant to moles product.
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what is the net ionic equation for this reaction? 2koh(aq) + h₂so₄(aq) …
C. $OH^- + 2H^+ ightarrow2H_2O(l)$
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what are spectator ions? a. ions that combine to form a precipitate b. …
B. lons that are not changed in the reaction
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how many molecules does 1 mole of o2 gas have? a. 3.01 × 10^23 molecule…
D. $6.02\times 10^{23}$ molecules
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what is the molarity of 2 mol of ki dissolved in 1 l water? a. 3 m b. 0…
D. 2 M
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which of the following would be produced in a combustion reaction? a. h…
C. Carbon dioxide
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question 20 of 25 finish balancing the following equation: _al(s) + 3zn…
B. 2
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the solubility table helps predict the products of what kind of reactio…
D. Double - replacement
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what type of reaction is zn + cucl₂ → cu + zncl₂? a. single - replaceme…
A. Single - replacement
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which reaction would be predicted by the activity series list? a. a met…
A. A metal replaces a metallic ion below it on the list.
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what coefficient will o2 have after balancing this equation? c4h8 + o2 …
C. 6
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which drawing is a structural model of c₃h₈? a. b. c. d. h - c - c - c …
B.
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in the reaction 2li(s) + 2h₂o(l) → 2lioh(aq) + h₂(g), which compound is…
D. $H_2$
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what is the general form of a single - replacement reaction? a. ab + cd…
B. AB + C → CB + A
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how many moles is 573.28 g of agcl? a. 5 mol b. 4 mol c. 2 mol d. 3 mol
B. 4 mol
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the mass of 1 mole of an element (in grams) is the same as which quanti…
C. The atomic mass of the element in atomic mass units
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the reactants of a reaction are 2agclo₃ and na₂co₃. according to the la…
C. $Ag_2CO_3$
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in the reaction a + b → c + d, what are the reactants? a. just b b. c a…
D. A and B
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what does a mole represent? a. the number of protons in a nucleus b. th…
C. A very large, specific number of items
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what is the percent composition of magnesium (mg) in mgo? a. 70% b. 40%…
D. 60%
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for the group of four atoms or ions provided below, please select the s…
Zn²⁺, Cu⁺
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complete the paragraph to explain why water is a polar molecule. in a m…
In a molecule of water, the oxygen atom shares a pair of electrons with each hydrogen atom. Oxygen also has two nonbonding pairs of valence electrons. Because valence electrons ar…
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complete the following table. identify the type of bonding in each subs…
| Substance | Bonding | Highest Melting Point | |--|--|--| | $S_8$ | Covalent (intramolecular), London - dispersion (intermolecular) | $\bigcirc$ | | $CCl_4$ | Covalent (intramole…
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study the following sketch of a molecular orbital (mo) in a homonuclear…
| Property | Answer | |--|--| | Write the symbol for this MO. | $\sigma$ | | Is this a bonding or antibonding MO? | bonding | | What is the energy of this MO, compared to the ener…
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decide whether each molecule or polyatomic ion is polar or nonpolar. if…
| molecule or polyatomic ion | polar or nonpolar? | atom closest to negative side | | ---- | ---- | ---- | | NH₃ | polar | N | | F₂ | nonpolar | | | OCS | polar | O |
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answer the questions below about the highlighted atom in this lewis str…
In how many sigma bonds does the highlighted atom participate? 4 In how many pi bonds does the highlighted atom participate? 0 What is the orbital hybridization of the highlighted…
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answer the questions in the table below about the shape of the sulfur h…
What word or two - word phrase best describes the shape of the $SBr_6$ molecule? Octahedral What is the angle between the sulfur - bromine bonds? 90
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4. why is the salt solution heated in step 6? 5. how might the final tr…
4. To evaporate the solvent (water) and obtain salt crystals. 5. Use a desiccant or heat in an oven at a controlled temperature for a longer time. 6. Incomplete filtration of salt…
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which of the following is an example of a physical change? a. digesting…
D. Cutting your hair
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what is the molar mass of h₂co₃? a. 62 g/mol b. 30 g/mol c. 61 g/mol d.…
A. 62 g/mol
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which element is magnetic? calcium copper carbon cobalt
D. cobalt
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why are fossil fuels considered nonrenewable resources? a. because they…
B. Because they take millions of years to recreate
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the chemical reaction that occurs when gasoline and air are ignited is …
D. combustion reaction
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engineers often attempt to capture and reuse energy or to use renewable…
B. green design
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what happens when a molecule combusts? a. it combines with oxygen. b. i…
A. It combines with oxygen.
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question 9 of 10 which of the following is the correct model of c₈h₁₈? …
C.
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what reactants form a combustion reaction? a. a hydrocarbon and water b…
B. A hydrocarbon and oxygen
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question 1 of 10 which method of drawing hydrocarbons is the fastest to…
C. The stick model method
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what is a hydrocarbon? a. a molecule containing only carbon and oxygen …
B. A molecule containing only carbon and hydrogen
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4.3.4 quiz: balancing organic reactions question 4 of 10 what products …
C. Carbon dioxide and water
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what coefficient would the o₂ have after balancing c₄h₁₀ + o₂ → co₂ + h…
A. 6.5
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which of the following is a combustion reaction? a. naoh + hcl → nacl +…
C. $C_3H_8 + 5O_2 ightarrow3CO_2 + 4H_2O$
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what atom should be balanced last when balancing hydrocarbon combustion…
D. The oxygen atoms
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what is the oxidation number of bromine as a reactant and in the produc…
The oxidation number of $Br$ in $Br_2$ is 0 and in $Al_2Br_6$ is - 1.
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the reaction between aluminum and bromine is an oxidation - reduction r…
Al as a reactant: 0; Al in $Al_2Br_6$: + 3
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if a reaction starts with 4 cu atoms, 5 o atoms, and 10 h atoms, what i…
B. The products will contain 4 Cu atoms, 5 O atoms, and 10 H atoms.
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how many o atoms are in zn(clo₃)₂? a. 2 b. 3 c. 1 d. 6
D. 6
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question 8 of 10 what is the net ionic equation of 2h⁺ + so₄²⁻ + ca²⁺ +…
A. $SO_4^{2-}+Ca^{2+}\to CaSO_4$
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what is the complete ionic equation for naoh(aq) + hcl(aq) → h₂o(l) + n…
A. Na⁺ + OH⁻ + H⁺ + Cl⁻ → H₂O + Na⁺ + Cl⁻
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what are the spectator ions in na⁺ + oh⁻ + h⁺ + cl⁻ → h₂o + na⁺ + cl⁻? …
B. $\text{Na}^+$ and $\text{Cl}^-$
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question 5 of 10 what does a complete ionic equation look like? a. all …
A. All ionic substances are written as separate ions in solution.
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what is a net ionic equation? a. an equation that is balanced on both s…
C. An equation showing only what is involved in the reaction
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question 3 of 10 which of the following best describes a balanced react…
C. A reaction that has the same number and type of atoms on each side of the equation
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question 2 of 10 what is needed to balance the reaction cl₂ + ki → kcl …
D. 2KI and 2KCl
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what is an inorganic chemical? a. a chemical that makes up living thing…
B. A chemical that is not from living things
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write a net ionic equation for the reaction that occurs when solid magn…
$MgCO_3(s)+2H^+(aq) ightarrow Mg^{2 +}(aq)+H_2O(l)+CO_2(g)$
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write a net ionic equation for the overall reaction that occurs when aq…
$H^+(aq)+OH^-(aq) ightarrow H_2O(l)$
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write the net ionic equation for the precipitation reaction that occurs…
$Pb^{2+}(aq)+2Br^{-}(aq) ightarrow PbBr_2(s)$
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characterize hf as a strong, weak, or nonelectrolyte. o strong electrol…
1. HF: weak electrolyte 2. HBr: strong electrolyte 3. CH₃CH₂OH: nonelectrolyte
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question 4 what is true concerning physical and logical topologies? the…
Logical topologies refer to how a network transfers data between devices.