Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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for each compound, click the camera ( ) icon to take a snapshot. right …
Ionic charges: Be $2+$, N $3 -$; Chemical formula: $Be_3N_2$
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e. beryllium and nitrogen be n extension: chemical families get the giz…
1
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3. practice: use the gizmo to create stable compounds from the combinat…
A. Ionic charges: $Li^+$, $F^-$; Chemical formula: LiF B. Ionic charges: $Be^{2+}$, $O^{2 - }$; Chemical formula: BeO C. Ionic charges: $Mg^{2+}$, $F^-$; Chemical formula: $MgF_2$…
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geography of the mideast water is a major natural resource that is dist…
Water is a major natural resource distributed unevenly across Southwest Asia. Turkey and Iraq share the Tigris and Euphrates River system. Israel, Syria, and Jordan share the Jord…
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question: how are ionic compounds formed? 1. observe: look at the purpl…
1. A. 1 B. 2 C. No, because oxygen needs 2 electrons and one lithium can only give 1. 2. A. Yes B. $Li_2O$ C. $Li^+$, $Li^+$, $O^{2 - }$
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geography of the mideast water is a major natural resource that is dist…
Water is a major natural resource distributed unevenly across Southwest Asia. Turkey and Iraq share the Tigris and Euphrates rivers, Israel, Syria, and Jordan share the Jordan Riv…
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completion complete the table below using your periodic table. (1 point…
| Element | Atomic # | Atomic Mass | # of Protons | # of Neutrons | # of Electrons | | ---- | ---- | ---- | ---- | ---- | ---- | | O | 8 | 16 | 8 | 8 | 8 | | S | 16 | 32 | 16 | 16…
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matter and measurement quiz cp chemistry a o / module 1: chemistry basi…
nm
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matter and measurement quiz cp chemistry a o / module 1: chemistry basi…
The liquid is odorless., The solution is green.
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a. observe the sodium and chlorine atoms. how many electrons are there …
A. Sodium: 11, Chlorine: 17 B. Sodium: 11, Chlorine: 17 2. Sodium: 1, Chlorine: 7 3. A. Sodium: +1, Chlorine: -1
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multiple choice question which of the following represents an experimen…
The temperature of a container of baking soda is measured three times after 30 ml of vinegar is added.
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12 question (2 points) open ebook section 1.9 1st attempt see hint larg…
7.7
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17. how do the isotopes hydrogen - 1 and hydrogen - 2 differ? a. hydrog…
17. b. Hydrogen - 2 has one neutron, hydrogen - 1 has none 18. a. mass numbers 19. d. \(_{24}^{55}Cr\) 20. d. Rutherford 21. a. 16, 16, 18 22. b. 50 protons, 50 electrons, 75 neut…
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2. click pause ( ‖ ). elements can be classified as metals and nonmetal…
A. The atom from which it is easier to pull an electron is a metal. The atom from which it is harder to pull an electron is a nonmetal. B. The metal forms a cation and the nonmeta…
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to begin, check that sodium (na) and chlorine (cl) are selected from th…
Sodium: 1 Chlorine: 7
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calculations - put a box around the final answers to your calculations …
$m_1 - m_0$ 16)
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label the following ph scale with the correct numbers at the far ends a…
1. The far ends of the pH scale: The left - hand end is 0 (most acidic) and the right - hand end is 14 (most alkaline). Hair's pH (around 4.5 - 5.5) would be on the acidic side of…
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8. the atomic number of an element whose atoms have 15 protons and 16 n…
8. b. 15 9. b. number of protons 10. b. \(^{1}_{0}n\) 11. a. Atoms of the same element are always identical 12. d. protons and neutrons 13. c. compounds 14. b. neutron 15. c. isot…
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identify the choice that best completes the statement or answers the qu…
1. c. 28 2. a. 16 electrons 3. d. Mass and relative abundance of each isotope of that element 4. b. the mass number 5. c. $^{204}_{82}Pb$ 6. b. were composed of negatively charged…
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prelab questions -14 (1 pt). determine the concentration (in molarity) …
The molarity of sodium phosphate monobasic (assuming volume of 1 L) is approximately $0.0051\ M$. The volume of stock rennin solution for 5% concentration to make 25 ml is $1.25\ …
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read the paragraph. 1 alejandros guidance counselor is helping him plan…
sentence 3
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the chemistry and energy of life - part 2 5. in your own words, name th…
5. First Law: Energy conservation. Second Law: Entropy increase. 6. Activation energy: Reaction energy - barrier. Catalyst lowers it. 7. Catabolic: Complex - to - simple, exergoni…
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carbon what is the study of carbon - containing compounds called? what …
The study of carbon - containing compounds is called organic chemistry. Common elements that bond with carbon to make up macromolecules are hydrogen, oxygen, nitrogen, phosphorus,…
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dangers of nuclear power plants . nuclear accidents or \meltdowns\ coul…
C. toxic waste
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adhesive forces between water molecules and glass molecules help water …
When adhesive forces are greater than gravity, water rises in a capillary tube.
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read the sentence. 1 alejandros guidance counselor is helping him plan …
sentence 3
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read the paragraph. 1 ji - yoo is brainstorming topics for a term paper…
sentences 3 and 6
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geography of the mideast water is a major natural resource that is dist…
Water is a major natural resource that is distributed unevenly across Southwest Asia. Some countries like Turkey and Iraq, have major rivers which provide an ample (more than enou…
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determine whether each statement is true or false. a scoop - shaped con…
1. True 2. False 3. True 4. False 5. True
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question 10 10 pts true or false? in the reaction mg(s) + niso₄(aq) → m…
True
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expecting to see cages and animals at the zoo before arriving is an exa…
T
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in the reaction mg(s)+sn²⁺(aq) → sn(s) + mg²⁺(aq) as written: mg gets r…
Mg gets oxidized, $Sn^{2+}$ gets reduced
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protocol 1. your ta weighed out 1 g of lipase 2. your ta dissolved lipa…
The volume in mL is 50 mL and the mass - volume percent of the lipase solution is 2%.
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11. a student obtains a mixture of the chlorides of two unknown metals,…
B. The molar masses of X and Z ### 12.
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question 8 10 pts true or false? bacl₂(aq) + na₂so₄(aq) → baso₄(s) + 2 …
False
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true or false? a clear colorless solution was added to a cloudy light -…
True
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8 a student measures the mass of a sample of a metallic element, m. the…
B. What is the molar mass of M? ### 9.
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question 6 10 pts in a chemical reaction, a symbol that looks like a tr…
that the reaction occurs only if the reaction mixture is heated.
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randy was in an earthquake. afterwards she talked to her neighbors, who…
C. misinformation effect
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assuming 50% efficiency, 150 kcals of chemical energy would result in _…
B. 75 kcals
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types of atoms atomic number an element is the simplest form of matter …
Fluorine: Number of protons: 9 Number of electrons: 9 Iodine: Number of protons: 53 Number of electrons: 53
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a reaction where reactants are methane and elemental oxygen, and carbon…
B. combustion reaction
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large doses of vitamin c are supposed to cure the common cold. one comm…
7.7
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go online to explore and explain the makeup and properties of atoms and…
Most of an atom's mass is accounted for by protons and neutrons (in the nucleus). Most of an atom's volume is accounted for by the electron cloud (where electrons are found).
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question 4 10 pts if the following reaction is balanced correctly cucl₂…
C. 2
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amoeba sisters video recap: general lab safety. the illustrations below…
1. Wear proper lab clothing, gloves, goggles. 2. Keep walk - ways clear of bags. 3. Dispose of broken glass in proper container. 4. Do not take chemicals out of the lab. 5. Do not…
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final exam the palmer raids in the palmer raids, a. mitchell palmer and…
A. Federal Bureau of Investigation
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if the following reaction is balanced correctly cu + o₂ → cuo the coeff…
D. 2
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opción múltiple el combustible debe calentarse hasta su punto _________…
# Breve explicación: El combustible debe calentarse hasta su punto de inflamabilidad para iniciar la reacción química en cadena. # Respuesta: D. Punto de inflamabilidad
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el combustible debe calentarse hasta su punto ______________ para que c…
# Breve Explicación: El punto de inflamabilidad es la temperatura a la que un combustible puede encenderse y comenzar una reacción química en cadena. # Respuesta: Punto de inflama…
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how many neutrons are in a neutral aluminum atom? * *only type the numb…
14
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¿el fuego es un ______________? ○ deformación del espacio ○ proceso de …
Reacción química
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question 2 10 pts in the reaction 2 ba(no₃)₂(s)→δ 2 bao(s)+4 no₂(g)+o₂(…
B. reactant
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5. the mass spectrum represented to the right is most consistent with w…
B. Gd ### 6.
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match the following descriptions with its corresponding subatomic parti…
- Holds the nucleus together: Neutrons - Lives outside the nucleus: Electrons - Equals the atomic #: Protons - Determines the element: Protons - Responsible for reactions/bonding:…
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1. what ion will be formed by the phosphorus atom shown below when it h…
P3-
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part ii: multiple choice: merely circling the answers does not mean you…
1. B. $\frac{5.0\ g}{56.0\ g/mol}$ 2. A. The molar mass of $Cu$ 3. D. $N_2O_5$ 4. B. 91 amu
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a chemist puts 0.15 liters of liquid in each of 57 beakers. how much li…
$8.55$ liters
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what does the forward arrow in a chemical equation mean? (1 point) the …
The reaction yields something.
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what happens during rusting of an iron nail? (1 point) sulfur, iron, an…
Iron and oxygen combine to form iron oxide.
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chemical reactions quick check how do catalysts affect a chemical react…
lower activation energy
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question 8 (3 points) title: ch - 01 - 12 based on its formula, sugar c…
B. a compound
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question 1 10 pts which of the following is not a sign of a chemical re…
A liquid mixture turns into a solid after water evaporates from it.
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question 7 (3 points) title: ch - 01 - 03 brass is an alloy that resist…
C. homogeneous mixture
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chemistry (1 cr): section u60017tdfc > unit 1 elements and the periodic…
C. atoms
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question 5 (3 points) title: ch - 01 - 10 pencil \lead\ is actually mad…
B. an element
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question 3 0.5 pts the figure shows a liquid measurement using a 50 ml …
35.25 mL
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question 4 (3 points) title: ch - 01 - 04 strawberries contain vitamins…
A. Vitamins E, B, and C
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does this equation follow the law of conservation of mass? h₂so₄ + naoh…
No
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question 6 0.5 pts a student determines the mass of a sample of water b…
9.03g
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question 3 (3 points) title: ch - 01 - 08 which of the following contai…
C. compounds
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what is the mass for the miss formula below? (do not label the answer) …
55
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which of the following statements is always true for the law of conserv…
The mass is constant
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question 5 0.5 pts if a student determined that the volume of a sample …
0.96g/mL
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what is the total number of atoms on the reactant side of the chemical …
32
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how many protons does a neutral atom of aluminum have? *only type the n…
1. 13 2. Democritus
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question 2 (3 points) title: ch - 01 - 13 based on its formula, carbona…
C. mixture
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what is a function of the integumentary system? (1 point) forms blood c…
forms blood clots
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question 1 (3 points) title: ch - 01 - 09 which of the following contai…
B. elements
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question 23 of 25 which of the following would be a good situation in w…
C. When the $\Delta H_{reaction}$ is not known
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question 22 of 25 what information does gibbs free energy give about a …
B. It tells if the reaction will proceed spontaneously or not.
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question 21 of 25 what can be said about the reaction 2nh₃(g) → n₂(g) +…
D. The reaction is endothermic.
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question 20 of 25 what is the value for δg at 5000 k if δh = -220 kj/mo…
C. 30 kJ
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question 18 of 25 what best describes the enthalpy of formation of a su…
C. The energy change that happens when a substance forms from its elements
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fill in the grid for the element arsenic: *some may be used more than o…
| Property | Value | |--|--| | Atomic mass | 74.95 | | # of Protons | 33 | | # of Electrons | 33 | | # of Neutrons | 42 | | Atomic number | 33 |
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what is the thermal energy of a system? a. the average speed of molecul…
D. The total kinetic energy of the particles in a system
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question 15 of 25 how is entropy related to the spontaneity of a reacti…
B. $\Delta S > 0$ contributes to spontaneity.
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question 14 of 25 how does the entropy change in the reaction 2c3h6(g) …
C. The entropy increases.
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question 13 of 25 what does the δh of a reaction represent? a. it repre…
A. It represents the heat involved in a reaction.
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question 10 of 25 two kittens are sleeping in a sunny spot. they are re…
A. Radiation warming
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question 9 of 25 what would cause entropy to increase in a reaction? a.…
C. The products becoming more spread out
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question 7 of 25 what does it mean for heat to be transferred by convec…
C. Energy is transferred through moving currents of warmer air or liquid.
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question 6 of 25 how is stoichiometry used to calculate energy absorbed…
B. Grams liquid × mol/g × $\Delta H_{vap}$
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what is specific heat capacity? a. the energy required to completely me…
B. The energy needed to change the temperature of a substance
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question 3 of 25 what information does the potential energy diagram rev…
B. It shows whether the reaction is exothermic or endothermic.
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what can be said about a reaction with $delta h = - 890$ kj/mol and $de…
A. It is always spontaneous.
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what two subatomic particles make up an elements atomic mass? * atoms p…
B. Protons, D. Neutrons
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question 2 of 25 what can be said about a reaction with $delta h=-890$ …
There is no correct option among A, B, C, D. If we assume there is a small error in the calculation of the equilibrium temperature and consider the closest conceptually correct op…
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question 1 of 25 what volume of water can be boiled by 3.0 kj of energy…
D. 3.0 kJ×$\frac{1\ mol}{40.65\ kJ}$×18.02 g/mol×$\frac{1\ mL}{1\ g}$ = 1.3 mL
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people breathe in oxygen molecules from the air and exhale carbon dioxi…
B. An increase in entropy