Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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how many electrons, protons, and neutrons are present in an atom of pho…
electrons = 15 protons = 15 neutrons = 17
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the ions get sorted based on their size and a detector records each typ…
B. Different isotopes
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answer the following questions to determine what nanoscale species are …
A. Electrons
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question 6 of 10 choose the statements that are true about hydrogen and…
C. When hydrogen has two electrons in its valence shell, it has a full valence shell. D. Hydrogen can bond with oxygen to make water.
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question 5 of 10 select the statements that are true about electronegat…
B. If the difference in electronegativity is 0 to 0.5, the bond will be nonpolar covalent.
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match the term to its definition. covalent ? composed of two atoms diat…
Diatomic: Composed of two atoms Polar: A bond with unequal sharing of electrons Nonpolar: A bond in which neither atom takes more than its share of electrons Covalent: A bond in w…
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multiple choice question what is the largest source (volume) of groundw…
A. Agricultural chemicals and wastes
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select all that apply which of the following statements most accurately…
A. Bottled water is sometimes sourced from groundwater aquifers, which may not be tested for quality. B. Tests have found that some bottled water contains pathogens or toxins that…
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3. determine which of the values in the first row need to be used for e…
\( 1136003.4 \, \text{J} \) (or more precisely, \( 24.6\times46179 = 1136003.4 \, \text{J} \)) ### 2. Is melting an endothermic or exothermic process?
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directions: write the formulas of the following ionic compounds based o…
1. $\text{AlPO}_3$ 2. $\text{K}_2\text{SO}_3$ 3. $\text{Al}_2(\text{CrO}_4)_3$ 4. $\text{LiNO}_3$ 5. $\text{Sr}(\text{ClO}_4)_2$ 6. $\text{Be}(\text{OH})_2$ 7. $\text{Ca}(\text{C}…
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choosing which 2 types of slide are those that cannot interlock one ano…
B. freezing and deposition
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ibra is analyzing the properties of several samples of elements to find…
B. has a high luster and is very brittle
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this is how manganese appears in the periodic table. what is the arrow …
chemical symbol of manganese
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15. thermal pollution is caused by excess ______. options: sewage inorg…
heat
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7. to be classified as organic, a chemical’s molecules must be ____. ba…
C. based on carbon
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8. storing toxic chemicals in metal drums is unwise because ______. ○ m…
○ the drums corrode
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7. the pollutants associated with eutrophication are ______. ○ nitrates…
nitrates and phosphates
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6. to be classified as organic, a chemical’s molecules must be ______ ○…
based on carbon
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3. mercury, lead, nickel, and chromium are all examples of ____. compou…
○ heavy metals
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water pollutants you have just learned about water pollutants. now matc…
1. heavy metal → a poisonous metallic element with a high mass number 2. toxic chemical → an element or molecule that is directly harmful to living things 3. eutrophication → the …
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guided practice which kind of environmental disturbance is commonly fou…
D. thermal pollution
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guided practice which is a synthetic organic material? a. acid b. lead …
D. plastic
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10. crude oil is a toxic chemical that is ____. a pathogen organic a he…
organic
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9. microorganisms that cause diseases are classified as ______. organic…
○ pathogens
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4. mercury is a pollutant classified as ______. a pathogen an organic m…
a heavy metal
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1 the major cause of water pollution by industries involves—— toxic che…
A. toxic chemicals
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you have just learned about water pollution. now match each term with i…
- sewage → water that contains organic wastes from humans and industry - surface water → the water that is above ground in streams, lakes, rivers, and ponds - pathogen → a parasit…
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fill in the information missing from this table: some electron shells s…
Shell 1: subshell \( 1s \) (so the missing row is shell 1 with subshell \( 1s \))
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here are sketches of four atomic electron orbitals: a b c d are any of …
- Are any of them s orbitals? $\boldsymbol{Yes}$ - List the s orbitals, if any: $\boldsymbol{C}$ - Are any of them p orbitals? $\boldsymbol{Yes}$ - List the p orbitals, if any: $\…
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a student was studying the ocean floor topography and began to question…
Feature F is a continental shelf, the shallowest part of the ocean floor, while Feature G is a deep ocean trench, the deepest part of the ocean, which has more pressure than the c…
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6. through incidents of cancer and birth defects were reported by peopl…
B. chemicals leaking above ground
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you have just learned about land pollution. now match each term with it…
- hazardous waste → solid, liquid, or gaseous wastes that are potentially harmful to humans and the environment, even in low concentrations - toxic wastes → hazardous wastes made …
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guided practice which is classified as a corrosive hazardous waste? a. …
D. lye
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1. sand and computer chips share which element as their basic component…
silicon
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sample response: salt is ionic, and oil is covalent. if you add water, …
- the idea that water will dissolve salt - the idea that water does not dissolve oil - the idea of using electricity to test
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a scientist recorded the amount of substance z present in an ongoing ch…
0.08 g
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by mistake, you added salt instead of sugar to the oil. how can you rem…
1. Add a small amount of water to the oil-salt mixture and stir gently. The salt will dissolve into the water. 2. Let the mixture sit undisturbed until it separates into two layer…
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have low melting and boiling points and be a poop conductor of electric…
☑️ be a liquid or gas ☑️ not be soluble in water ☑️ not conduct electricity
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if a substance is ionic, then it likely will conduct electricity when d…
☑️ be a crystalline solid ☐ be soluble in water ☐ conduct electricity
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8 choice multiple 2 points which of the following is the most likely re…
A. adding more bleach no longer increased the level of chlorine gas.
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a scientist recorded the amount of substance y present in an ongoing ch…
2.3 g
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6 elección múltiple 2 puntos each of the following is a by - product re…
B. $\ce{NaOCl}$
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the production of a certain plastic calls for a mixture of bleach and a…
C. Minimum of 1.00 mol NaOCl and maximum 1.00 mol NH₃ (assuming the options are labeled A, B, C, D with C being the selected one in the image)
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biogeochemical cycles: the nitrogen cycle decide if each statement is t…
Verdict: FALSE. Explanation: Lightning helps fix atmospheric nitrogen (converts \(N_2\) to nitrogen oxides) which then enter the soil via rain, it does not add nitrogen to the atm…
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4 respuestas múltiples 2 puntos select the chemicals that have a covale…
A. \( \text{NH}_4\text{Cl} \) B. \( \text{NH}_3 \) D. \( \text{NCl}_3 \) E. \( \text{Cl}_2 \)
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3 (choice couple 2 points) if a ninth trial were conducted in experimen…
C. \( 0.12 \, \text{mol} \) (assuming the option with \( 0.12 \, \text{mol} \) is labeled as option C, if the original labeling was different, adjust the label according to the or…
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in experiment 2, different quantities of naocl were added to the ammoni…
The amount of \( \text{NH}_3 \) available for reaction is limited, and once used up, the reaction stops
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summarize what you have studied if a substance is ionic, then it likely…
conduct electricity when dissolved in water (or melted), have a high melting point, and be brittle (the most common core property is: conduct electricity in aqueous solution or mo…
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another know by - product of the reaction of bleach and ammonia is nitr…
C. between the trials of 0.50 and 1.00 mol of NH3. G
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experiment 2 another know by - product of the reaction of bleach and am…
between the trials of 0.50 and 1.00 mol of NH3. G
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you have just learned about minerals. now match each term with its defi…
1. smelting → the process of heating and refining an ore to separate out the valuable minerals 2. ore → a rock or mineral that contains economically desirable metals or nonmetals …
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guided practice which is a characteristic of rocks or minerals that mak…
B. They contain metals or nonmetals.
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gunshot residues because all firearms explode gunpowder, they produce g…
From gunshot residue (GSR) examination, we can learn: (1) Whether a person fired a gun (as GSR could be found on their hands or clothing). (2) Even if GSR is attempted to be remov…
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1) sugarcane is an example of a plant that can be used to produce which…
ethanol
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15. which is not a major component of natural gas? propane hydrogen sul…
carbon monoxide
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13. ethane, with the chemical formula $c_2h_6$, is an example of ____. …
a hydrocarbon
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8. some farmers store animal droppings in containers and capture natura…
methane
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5. thymine and adenine form a base pair in the dna molecule. these two …
D. The diagram showing correct hydrogen bonding between thymine (left) and adenine (right) via two hydrogen bonds, with proper donor-acceptor interactions.
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(a) the c-f is easier to break than the c-h bond. (b) the c-f is more p…
B. \( \text{Na}^+ \) ### Second Question (Boiling Point of Hydrocarbons)
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1. | compound name | structural formula | molar mass (g/mol) | | ---- |…
D. Propanoic acid, because it can form intermolecular hydrogen bonds ### Second Question (Nonane vs 2,3,4 - trifluoropentane Boiling Point) (Note: The question seems cut off, but …
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3. pharmaceutical drug diversion schemes generally involve: a. all pres…
3. d. controlled substances 4. a. motorized wheelchairs and scooters
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who was johannes kepler, and why is he known today? (5 points) he was a…
He was a German astronomer who figured out that planets orbit in ellipses, not perfect circles.
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summarize what you have studied if a substance is ionic, then it likely…
conduct electricity when dissolved in water (or melted), and have a high melting/boiling point
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calcium oxide (cao) is ✓ ionic complete what properties would you expec…
- It is likely soluble in water. - It will likely light up a bulb in a conductivity apparatus. - It will likely have a high melting point.
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spoon beaker stirring rod graduated cylinder distilled water in spray b…
Spoon, Beaker, Stirring Rod, Graduated Cylinder
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exercise 6th february, 2020 1. state the three main type of salt and ex…
1. Acidic Salt - Example: $\ce{NaHSO_4}$ 2. Basic Salt - Example: $\ce{Ca(OH)Cl}$ 3. Neutral Salt - Example: $\ce{NaCl}$ ### Sub - Question 2: State any 4 properties of salt
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the term used to describe atoms chemically joined together is... select…
d. bonded.
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what is the correct ratio of the atoms of the two elements present in a…
1. c. 1:2 2. b. 2 hydrogen atoms
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a shorthand that uses chemical symbols and subscripts to represent the …
1. c. formula. 2. a. 3
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in the compound represented by the chemical formula nh₄cl there would b…
1. d. 1 nitrogen atom. 2. a. A
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bonding in which atoms share electrons is called... select one: a. bina…
b. covalent bonding.
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consider the possible bonding of the atom shown below. the atom would p…
a. lose an electron.
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analyze how the conductivity test worked how does a conductivity appara…
Ions complete the flow of electrons to form a circuit.
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which of the following elements is correctly matched with the number of…
c. Chlorine (Cl) .. 1
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which of the following statements about the valence electrons is false?…
First question: d. Valence electrons are found in the nucleus. Second question: c. II and IV
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select one: a. i and ii b. ii and iii c. ii and iv d. iii and iv which …
d. III and IV --- ### Second Question (Diatomic Molecule)
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which of the following models represents a positive ion? a: 11 protons …
a. A
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when atoms bond by gaining or losing electrons, what kind of bond is fo…
d. Ionic bond
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sulfur has 16 electrons. after it bonds with magnesium it acquires a 2-…
1. d. 18 2. a. BeO
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lab: ionic and covalent bonds assignment: reflect on the lab active det…
No, the hypothesis is not completely supported. There are key exceptions: some polar covalent substances dissolve in water and conduct electricity in solution, and some ionic subs…
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when magnesium combines with chlorine, it loses 2 electrons. what is th…
1. a. +2 2. a. oppositely charged ions attract.
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which of the following will become a negative ion when it bonds with an…
a. A
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one calcium atom (ca⁺²) will combine with which of the following atoms …
b. O⁻²
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when the atom pictured below is entering into a chemical bond, it has a…
c. gain electrons.
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when a fluorine atom gains an electron from a lithium atom and the stab…
1. d. ionic. 2. c. C
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which of the following elements will form an ionic bond with the elemen…
1. b. B 2. c. +1
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which of the following statements about an oxidation number is false? s…
1. c. An oxidation number is equal to the number of electrons found in an atom of the element. 2. b. -1
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seleniums oxidation number is -2. to become stable it must... select on…
1. a. lose 2 electrons 2. d. $\text{Na}_2\text{S}$
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the correct name for the compound that has the formula bacl₂ is... sele…
1. b. Barium chloride. 2. d. $\text{CaI}_2$
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which of the following is the correct formula for the compound formed b…
1. a. $\text{ScCl}_3$ 2. c. potassium oxide
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the oxidation numbers in a compound always add up to... select one: a. …
1. d. 0 2. b. -1
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in the compound mgo, what is the oxidation number of oxygen? select one…
1. d. -2 2. d. Polyatomic ions do not combine with ions of the opposite charge to form chemical compounds
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when the polyatomic ion (so₄)²⁻ combines with the iron (iii) ion, fe³⁺,…
1. c. $\text{Fe}_2(\text{SO}_4)_3$ 2. b. sodium carbonate
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which of the following isotopes should be expected to be radioactive? (…
d. D ($_{94}^{244}\text{Pu}$)
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atoms of the same element that have different mass numbers are called..…
a. isotopes.
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what kind of nuclear radiation consists of the most massive and slowest…
1. c. Alpha 2. c. Physical
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hydrogen and oxygen combine to form water. this is an example of what t…
1. b. Chemical 2. d. a nuclear change.
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when placed in a cloud chamber, a radioactive substance does which of t…
1. a. Leaves a trail of condensed water vapor. 2. b. nuclear fission.
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which of the following statements about the normal operation of nuclear…
1. b. A small amount of fuel produces a large amount of energy. 2. c. Fossil B contains more carbon-14 than fossil A does.
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a certain volume of water contains 100,000 hydrogen atoms and 50,000 ox…
8000000