Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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suppose 7.5 g of compound a are consumed in a reaction with 10.0 g of c…
17.5 g 80%
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compound a reacts with compound b to form only one product, compound c,…
- Theoretical yield of \( C \): \( 9.6\ \text{g} \) - Mass of \( B \) consumed: \( 4.6\ \text{g} \)
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each week capechem, a manufacturer of fine chemicals, uses up 150. kg o…
600 kg, 426 kg
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suppose 3.5 g of compound a are consumed in a reaction with 9.5 g of co…
13.0 g 49%
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black forest biologicals, a biotech startup, has a promising alzheimers…
Trial 1: Theoretical yield \(450\) mg, \(\%\) yield \(91\%\) Trial 2: Theoretical yield \(850\) mg, \(\%\) yield \(89\%\)
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true or false: a haccp work flow chart should be created for every menu…
True
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during the hazard analysis stage of haccp, what type of food safety ris…
All of these risks are considered.
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during the hazard analysis stage of haccp, what type of food safety ris…
# Brief Explanations: HACCP (Hazard Analysis and Critical Control Points) is a systematic preventive approach to food safety. During the Hazard Analysis stage, all types of food s…
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measurements show that unknown compound x has the following composition…
\(C_4H_6O_4\)
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las unidades más pequeñas de la materia se llaman ____. protones molécu…
átomos
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measurements show that unknown compound x has the following composition…
\(Fe_2O_3\)
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completa este cuestionario para finalizar la tarea de química moderna q…
electrones
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deep inside the emotional center of the brain, an almond - shaped struc…
cortisol
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completa este cuestionario para finalizar la tarea de química moderna q…
vinculo
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completa este cuestionario para finalizar la tarea de química moderna q…
sólidos
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the drawing below shows a mixture of molecules: key carbon hydrogen nit…
- Of which reactant are there the most initial moles? Enter its chemical formula: \(H_2\) - Of which reactant are there the least initial moles? Enter its chemical formula: \(N_2\…
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what happens when you heat a solid? heating a substance increases its t…
The substance melts and becomes a liquid.
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which equation obeys the law of conservation of mass? h₂(g) + o₂(g) → h…
\(2H_2(g)+O_2(g)\to 2H_2O(g)\)
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3.2 mc: use the image below to answer the question. which statement bel…
Empires fell and were divided into new nations following the end of the war.
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3 multiple choice 1 point a change in the state of matter of something …
Changing water from liquid to solid is an example of a physical change.
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4 multiple choice 1 point what kind of changes do chefs make to food? c…
Chefs make chemical and physical changes.
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choose the answer that best completes the sentence below. chopping up a…
B. on the other hand
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understand the physical and chemical properties of matter ll-in-the-bla…
- boiling point: P - burning wood: C - color: P - density: P - hair lightening: C - hardness: P - ice melting: P - odor: P - permanent haircolor: C - rusting iron: C - solubility:…
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what is a rock? naturally occurring solid mass of minerals, or a collec…
naturally occurring solid mass of minerals, or a collection of minerals
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use the chart above. which best describes the relationship between the …
The more tightly packed the molecules in the material, the faster the speed of sound.
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1. sound waves travel the fastest through materials in which the molecu…
air
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a chemist dissolves 440. mg of pure potassium hydroxide in enough water…
\(12.7\)
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phosphoric acid $(h_{3}po_{4})$ is a polyprotic acid. write balanced ch…
$$H_3PO_4(aq)+H_2O(l) ightleftharpoons H_3O^+(aq)+H_2PO_4^-(aq)$$ $$H_2PO_4^-(aq)+H_2O(l) ightleftharpoons H_3O^+(aq)+HPO_4^{2 - }(aq)$$ $$HPO_4^{2 - }(aq)+H_2O(l) ightleftharpoon…
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6. select all possible answers which of the following best describe gas…
6. A. moving randomly, B. collide into each other, D. high kinetic energy 7. A. TRUE 8. D. All of the above 9. C. liquid 10. A. liquid
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carbonic acid (h_{2}co_{3}) is a polyprotic acid. write balanced chemic…
$$H_{2}CO_{3}(aq)+H_{2}O(l) ightleftharpoons H_{3}O^{+}(aq)+HCO_{3}^{-}(aq)$$ $$HCO_{3}^{-}(aq)+H_{2}O(l) ightleftharpoons H_{3}O^{+}(aq)+CO_{3}^{2 - }(aq)$$
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carbonic acid (h₂co₃) is a polyprotic acid. write balanced chemical equ…
$$H_2CO_3(aq)+H_2O(l) ightleftharpoons H_3O^+(aq)+HCO_3^-(aq)$$ $$HCO_3^-(aq)+H_2O(l) ightleftharpoons H_3O^+(aq)+CO_3^{2 - }(aq)$$
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sulfurous acid (h₂so₃) is a polyprotic acid. write balanced chemical eq…
$$H_{2}SO_{3}(aq)+H_{2}O(l) ightleftharpoons H_{3}O^{+}(aq)+HSO_{3}^{-}(aq)$$ $$HSO_{3}^{-}(aq)+H_{2}O(l) ightleftharpoons H_{3}O^{+}(aq)+SO_{3}^{2 -}(aq)$$
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1. which states of matter both have a fixed volume? a. gas and liquid b…
1. b. solid and liquid 2. a. True 3. a. plasma 4. a. Gas: It expands to fill the container. 5. a. Can flow past each other
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mole conversions practice worksheet mass → moles → moles → mass (use mo…
Approximately \(0.371\space g\) of hydrogen gas is produced.
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question 10 match the following types of strokes to their descriptions …
1. Ischemic stroke - Blood supply to the brain is interrupted 2. Hemorrhagic stroke - Ruptured blood vessel causes bleeding in the brain 3. Transient ischemic attack (TIA) - Tempo…
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3. ca(oh)₂ + h₃po₄ → ca₃(po₄)₂ + h₂o 4 fes + o → feo + so
$$3Ca(OH)_2 + 2H_3PO_4=Ca_3(PO_4)_2 + 6H_2O$$
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4 why do chemical equations need to be balanced? a chemical reactions d…
C. Matter cannot be created or destroyed, so both sides have to be equal
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2 what does a molecular formula show? a the type and number of atoms in…
A. The type and number of atoms in one molecule of a substance
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1 which of these is an example of a chemical reaction? a atoms join tog…
B. Atoms form a chemical bond, creating a new substance
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which is best to do with sentence 7 (reproduced below)? environmental c…
Add a citation indicating the source of the quotation from Murray.
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7. aspartame is an artificial sweetener that is 160 times sweeter than …
a) \(294.304\ g/mol\) b) \(0.0357\ mol\) c) \(2.15\times 10^{22}\)
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how many atoms of hydrogen are in h₂o
2
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how many sodium atoms are in 6nacl?
6
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how many hydrogen atoms are in 4h₂o?
\(8\)
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what does the number 4 represent in 4nh₃?
Coefficient
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chapter 3 review worksheet name: 1. what is the mass of 5 moles of fe₂o…
1. \(798.5\space g\) 2. \(11.3\space mol\) 3. \(1.83\times10^{23}\) 4. \(4.65\space g\) 5. \(0.05\space mol\) 6. \(2.41\times10^{24}\)
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given the following reaction: p₄o₁₀ + 6 h₂o → 4 h₃po₄ if 80.41 g of p₄o…
111.0 g
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caco₃ what is the total number of atoms that make up this compound?
\(5\)
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a student calculated that the theoretical yield would be 200. g of copp…
C. 90.0 %
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culminating question: after critically reading the text, now answer the…
A chemical reaction is a transformation of substances (reactants) into new substances (products). It demonstrates the Law of Conservation of Mass as the total mass of reactants eq…
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predict whether aqueous solutions of the following compounds are acidic…
- \(KI\): neutral - \(NaCN\): basic - \(Fe(ClO_{4})_{3}\): acidic
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which of the following best explains the process of electricity generat…
C. At the anode, hydrogen is oxidized and electrons flow in a circuit to the cathode. At the cathode, oxygen reacts with the hydrogen to produce water. Water and heat are by - pro…
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predict whether aqueous solutions of the following compounds are acidic…
- \(NH_4Cl\): acidic - \(NaNO_3\): neutral - \(NaCH_3CO_2\): basic
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given the following reaction: n₂ + 3 h₂ → 2 nh₃ if 10.0 moles of ammoni…
\(5.00\space mol\space N_{2}\) (corresponds to the second option)
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predict whether aqueous solutions of the following compounds are acidic…
- \(NaOH\): basic - \(NaI\): neutral - \(AlCl_{3}\): acidic
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purpose: to observe and identify metallic ions using flame tests. backg…
1. ground; excited; excited; ground; light (photons) 2. A flame test is a qualitative test. It identifies elements based on characteristic colors (qualitative characteristic) not …
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module test 1. a nerve impulse is defined as: the chemicals in the brai…
The electrical signal transmitted along a nerve fiber in response to a stimulus.
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what is the formula of calcium bromide? a) ca₂br b) cabr₂ c) ca₂br₂ d) …
B. \(CaBr_{2}\)
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what is the name of the compound whose formula is na3p? a) sodium phosp…
D. sodium phosphide
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which is the correct name for the compound n₂o₄? a) dinitrogen quadoxid…
D. dinitrogen tetroxide
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what is the chemical formula of aluminum bromide? a) al₂br₆ b) albr₃ c)…
B. \(AlBr_{3}\)
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which is the correct name for the compound pcl₅? a) phosphorus chloride…
D. phosphorus pentachloride
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which of these formulas is written incorrectly? a) ca(oh)₂ b) al₂(so₄)₃…
D. \(AlOH_3\)
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in naming the compound pcl₅, the prefix used for the second element is
penta -
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which is the correct name for the compound n₂o₃? a) trinitrogen dioxide…
B. dinitrogen trioxide
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what is the name of the compound whose formula is fes? a) iron(ll) sulf…
A. iron(II) sulfide
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what is the formula of calcium bromide? a) ca₂br₂ b) ca₂br c) cabr₂ d) …
C. \(CaBr_{2}\)
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in the above chemical equation solve for a, z, and x. _{9}^{12}b \to _{…
\(A = 12\), \(Z = 10\), \(X=Ne\)
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basic driver - auto(d) question #40 / 50 which of the following are vio…
A. All of the answers below
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2. chromium - 48 has a short half - life of 21.6 hours. how long will i…
\(108\space h\)
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2. what kind of reaction do nuclear power plants currently use to gener…
B. Fission reactions
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1. the mass number for the radioisotope carbon - 13 is: a. 6 b. 7 c. 12…
d. 13
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3. when wood is burned, the process is exothermic. what does the word e…
C. Energy is released.
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7.4 and 7.5 rational equations homework score: 21/25 answered: 21/25 qu…
9.1
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draw the lewis structure of xecl₂ and then determine the hybridization …
The Lewis structure of \(XeCl_{2}\) has Xe in the center with two Cl atoms bonded to it via single bonds and Xe having 3 lone - pairs. The hybridization of the central Xe atom is …
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draw the lewis structure of hydrogen cyanide (hcn) and then determine t…
C. \(sp\)
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which atomic orbitals from carbon hybridize to form the bonds in ch₄?
C. \(2s, 2p_{x}, 2p_{y}, 2p_{z}\)
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thionyl chloride (socl₂) is a chlorinating reagent used to prepare alky…
\(sp^{3}\) (Option D)
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determine the hybridization around the circled atom in the lewis struct…
B. \(sp^{2}\)
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draw the lewis structure of ch₂nh and then choose the appropriate pair …
\(sp^{2}/sp^{3}\) (corresponds to option C if option C is \(sp^{2}/sp^{3}\))
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draw the lewis structure of ch₂nh and then choose the appropriate pair …
C. \(sp^{2}/sp^{3}\)
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draw the lewis structure of ch₃oh. then determine the hybridization of …
D. \(sp^{3}\)
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polyatomic naming and formulas 1. mo(oh)4 2. barium phosphate 3. calciu…
1. molybdenum(IV) hydroxide 2. \(Ba_3(PO_4)_2\) 3. \(Ca(ClO_3)_2\) 4. ammonium chloride 5. \(Na_2CO_3\) 6. nickel(II) cyanide 7. potassium cyanide 8. \(Sr(NO_3)_2\) 9. \(LiNO_3\) …
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name: hoanm mena date: 11/6/25 nomenclature #2 ionic with transition me…
1. copper (II) chloride 2. iron (II) oxide 3. calcium fluoride 4. lithium oxide 5. mercury (I) iodide 6. strontium oxide 7. zinc fluoride 8. sodium fluoride 9. mercury (II) phosph…
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in $sp^{2}$ -hybridized orbitals, how many p - orbitals remain to form …
One.
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1. read the article linked in google classroom. write 1-2 sentences sum…
True, True, False, False, True
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determine the hybridization around the circled atom in the lewis struct…
\( sp \)
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name: date: nomenclature #1 simple ionic 1) na₃n 2) sns 3) caf₂ 4) li₂o…
1) Sodium nitride 2) Tin (II) sulfide 3) Calcium fluoride 4) Lithium oxide 5) Cesium nitride 6) Strontium oxide 7) Potassium phosphide 8) Sodium fluoride 9) Tin (IV) phosphide 10)…
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draw the lewis structure of carbonate (co₃²⁻) and then determine the hy…
The Lewis structure of \(CO_{3}^{2 - }\) has a central carbon atom double - bonded to one oxygen and single - bonded to two other oxygens (with appropriate lone pairs on oxygen at…
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a π bond could be formed from the overlap of which two orbitals? answer:
D. two unhybridized \(p\) orbitals
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draw the lewis structure of nitrite (no₂⁻) and then determine the hybri…
The Lewis structure of \(NO_{2}^{-}\) has \(N\) as the central atom, bonded to two \(O\) atoms (with resonance between a single bond and a double bond). The hybridization of the c…
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how many σ bonds are in the structure of the organic molecule below?
14
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1. what is an isotope? 2. what does the number next to the isotopes nam…
1. Átomos del mismo elemento con igual número atómico y diferente número de masa. 2. El número de masa (suma de protones y neutrones). 3. Por su número de masa (diferencia en neut…
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chem_001a_001_25f - general chemistry methyl cyanoacrylate is the main …
\(16\)
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what does this number represent? number of electrons number of protons …
Number of protons
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how many electrons does a hydrogen atom have?
1
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how many neutrons are in 1 atom of carbon - 13?
7
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isotope practice worksheet 1. here are three isotopes of an element: ( …
a. carbono b. número atómico c. número de masa d. 6 protones y 6 neutrones e. 6 protones y 7 neutrones f. 6 protones y 8 neutrones
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what is the atomic mass of hydrogen?
1
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if an atom has 9 protons 10 electrons and 10 neutrons. what is the char…
\(-1\)