化学
化学反应、化学计量、分子结构与元素性质。
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consider this claim: chewing gum can improve our alertness and lower ou…
B. In a study of forty participants, those who chewed gum while performing stressful tasks had lower levels of anxiety and higher levels of alertness than those not chewing gum.
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question 4 1 pts which of the following is not an example of physical w…
Question 4: A. oxidation Question 5: A. clay minerals
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use the following information to answer the next question. reduction ha…
a
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which of the following equations represents a spontaneous oxidation - r…
a. $2Ac^{3+}(aq)+3Tl(aq)\to3Tl^{3+}(aq)+2Ac(s)$
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question 2 1 pts which of the following sedimentary structures can be u…
Question 2: cross bedding Question 3: Spheroidal blocks of rock tend to weather quickly into other shapes.
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the reactants and products of photosynthesis are made of the same amoun…
$6CO_2+6H_2O ightarrow C_6H_{12}O_6+6O_2$ (Option 2)
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balancing act practice balance each equation. be sure to show your list…
1. $2Na + MgF_2 ightarrow 2NaF+Mg$ 2. $Mg + 2HCl ightarrow MgCl_2 + H_2$ 3. $Cl_2+2KI ightarrow 2KCl + I_2$ 4. $2NaCl ightarrow 2Na + Cl_2$ 5. $4Na + O_2 ightarrow 2Na_2O$ 6. $2Na…
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question 2 not yet answered marked out of 1.00 p flag question copper c…
a. I and V only
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molecular compounds non - metal atoms can share electrons with other no…
# Explanation: ## Step1: Recall element - type rules Metals are on the left - hand side and middle of the periodic table, non - metals on the right. Ionic compounds form between m…
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use the following information to answer the next question. reduction an…
a. I, II, and VI
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5 question review: answer the following questions about oxygen; 1. a. g…
a. 16 b. 2 c. Chalcogen d. Non - metal e. Gas ### 2.
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chemistry i d. determine the molecular formula for each compound descri…
9. $N_2O_4$ 10. $C_8H_{12}O_4$ 11. $C_{14}H_{18}O_2$ 12. $C_{10}H_{14}N_2$ 13. $C_9H_{13}O_3N$
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reactivity is what type of property? physical chemical
Chemical
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a small chunk of matter is made only from gold atoms. this is an exampl…
A. Element
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chemistry 1 worksheet 7 - 3 percent composition & empirical formulas na…
1. Percent composition of \(Cr_2O_3\): \(Cr\approx68.42\%\), \(O\approx31.58\%\) 2. Percent composition of \(Ca_3(PO_4)_2\): \(Ca\approx38.76\%\), \(P\approx19.97\%\), \(O\approx4…
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what was the difficulty with bohrs model of the atom? a it was too comp…
B. It only explained the atomic emission spectrum of hydrogen.
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read the excerpts from lizzie bright and the buckminster boy. excerpt 1…
the only one for all the island's students
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15. some molecules that are covalently bonded do not have a difference …
Symmetric arrangement of electrons around the central atom.
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9. match the descriptions with the terms. this affects the solubility o…
1. Pressure 2. Solubility 3. Alloy 4. Dissolution 5. Concentration 6. Dilution/Concentration
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balancing chemical equations balancing chemical equations drill level 3…
$K_2O + H_2O = 2KOH$; $4Cr + 3O_2 = 2Cr_2O_3$; $Cu(NO_3)_2+2KOH = Cu(OH)_2+2KNO_3$; $BaCl_2+Na_2SO_4 = 2NaCl+BaSO_4$; $2SO_2+O_2 = 2SO_3$; $16Ni + 3S_8 = 8Ni_2S_3$; $Sc_2O_3+3H_2O…
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a solution with less than the maximum amount of solute is ____. dynamic…
D. unsaturated
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choose three characteristics of a solution. the particles are small eno…
The particles are small enough that they cannot be filtered. It is stable and does not settle out as a solid. It is uniform, with solute that is evenly distributed.
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what aids dissolution because it spreads out and disperses a solute mor…
stirring or agitation
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increasing the ____ of a solute makes it easier for dissolution to occu…
A. surface area
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a ____ is a mixture created when a liquid is used to dissolve a substan…
B. solution
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which of these is an example of a mixture? ○ cereal and milk ○ aluminum…
A. cereal and milk
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what is an example of the effect of pressure on solubility? salt dissol…
D. carbon dioxide gas bubbles escaping a soft - drink can
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a ____ is formed when substances are physically combined. composite ble…
D. mixture
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a solution is at the ____ when the solvent cannot dissolve any more sol…
C. saturation point
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what happens to salt particles left over that cannot be dissolved in a …
They are crystals.
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a mixture in which water is the liquid used to dissolve a substance is …
A. aqueous solution
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a liquid used to dissolve a substance is a(n) ____. element solvent mix…
B. solvent
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examples of alloys include brass, steel, and colored gold carbon, oxyge…
A. brass, steel, and colored gold
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a mixture keeps its ____ and you can usually separate its parts easily …
B. properties
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a solute with high ____ can easily dissolve in another substance. mixtu…
D. solubility
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a dissolved substance is a ____ solvent chemical mixture solute
D. solute
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under certain conditions, a solution may become ____ and dissolve more …
B. supersaturated
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a solution reaches dynamic equilibrium when the ____ are the same. - ma…
B. rates of crystallization and dissolution
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identify the types of energy being shown in each picture below
Elastic potential energy, Chemical energy, Light energy, Electrical energy, Thermal energy
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types of energy practice match the descriptions of the forms of energy …
1. b. Gravitational 2. a. Kinetic 3. c. Elastic 4. e. Chemical 5. b. Gravitational 6. e. Chemical 7. f. Electromagnetic 8. e. Chemical 9. g. Electric 10. a. Kinetic 11. e. Chemica…
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instructions: use the formula for force to solve the following problems…
1. $21800$ N 2. $0.63$ N 3. $1024$ N 4. $13926.5$ N 5. $57.71$ N 6. $5.56227$ N
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multiple - choice question when naming a chemical compound we start fro…
the lowest numbered carbon.
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name real world connection: the grand canyon the colorado river has pla…
Erosión: c; River currents, Deepening of the canyon, River flowing carrying sediment Deposición: a; Formation of sandbars, Sediment layers Transporte: d Meteorización: b; Acid rai…
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1. what are the two types of lab emergencies that are focused on in thi…
1. Chemical spills and fires (common types, video - dependent) 2. True 3. Hold your eyelids open 4. At least 15 minutes 5. Safety shower 6. Fuel, oxygen, ignition source 7. True 8…
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name earths changing surface after reading about earths changing surfac…
1. breaks 2. composition, pieces 3. sediment 4. Natural 5. erosion 6. landforms 7. thousands 8. Deposition 9. flow 10. Compaction 11. pressing 12. millions 13. riverbeds
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in this schematic, the total resistance is a 50 ohms b 100 ohms c 1,000…
A. 50 ohms
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which of the statements describes heat? the energy that can only be rel…
the kinetic energy generated by random movements of molecules or atoms
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which of the following are signs of a chemical change? changes in odor,…
changes in odor, color, and temperature
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which of the following is an example of a chemical change? a piece of b…
a piece of bread being toasted
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an exothermic reaction is a reaction that produces heat. which would de…
a chemical change
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which of the following indicates that a chemical change is occuring? a …
a substance producing a new gas
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which of the following choices is an example of a chemical change? a ru…
A. a rusty car
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hydrogen and oxygen atoms are more stable when they form bonds in a mol…
water
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what type of bond would form between atoms of the following elements? c…
A. ionic
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hydrogen and oxygen atoms water molecule hydrogen hydrogen hydrogen whi…
c. By sharing electrons, both the hydrogen and oxygen atoms fill their outer energy levels and become more stable.
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which of the following is an example of a chemical change? nails rustin…
nails rusting
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what is a chemical change? the appearance of an object changes, but its…
One kind of matter changes into a different kind of matter with different properties.
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which of these is a chemical change? paper burning salt dissolving wate…
paper burning
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which of the following is not an example of a chemical change? a piece …
a piece of paper being torn
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when fireworks explode, what is happening to the fireworks? a chemical …
A. A chemical change
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read the passage from sugar changed the world. we all crave sweetness, …
D. Sugar cane is no longer the main source of sweetness for most people.
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video 2: safety data sheets (sds) (6:01) 1. being prepared means workin…
1. Having knowledge about chemicals 2. a. Chemical properties; b. Hazards; c. Safety precautions 3. 16 4. Hazard - identification section 5. Danger 6. True 7. True 8. Details expo…
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carbon has 4 valence electrons. hydrogen has 1 valence electron. how ma…
C. 4
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which of the following statement(s) about chemical bonding are true? se…
C. Bonding occurs to give both atoms a more stable electron configuration D. Bonds are formed by valence electrons of interacting atoms
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an unexpected surprise abdul slouched deeper into his chair, trying to …
Abdul slouched deeper into his chair: B. Do Not Include Abdul felt hopeless as his teacher handed back their chemistry tests: C. Include in a Summary Abdul sees the bright red num…
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porcelain originated in china around 2,000 years ago, but its productio…
C. It identifies when and where porcelain eventually began to be produced in Europe.
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10. what principle is central to understanding reaction rates and is ba…
A. Collision Theory
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13. what is the name of the food defense program created by the fda? a.…
13. b. ALERT 14. c. 41°F - 135°F 15. a. Call 911 and poison control 16. b. Yellowing of the eyes and skin 17. d. All of the above ARE recommendations for waiters/waitresses when d…
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6. which of the following statements is true about catalysts? a. cataly…
A. Catalysts provide an alternative reaction pathway with lower activation energy.
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4. in a chemical reaction, the actual yield is 90 grams, and the theore…
A. 90%
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kinetic energy is best described as ________. the energy of movement. c…
the energy of movement.
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practice & problem solving leveled practice in 7 and 8, perform the ope…
7. $4.9\times10^{-11}$ 8. $1.12\times10^{6}$ 9. $n = 2$ 10. $4.5\times10^{3}$ 11. $1.59\times10^{-18}$ grams 12. Incorrect. The correct product is $9.6\times10^{5}$ 14. $2.537\tim…
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acs chemical safety video questions instructions answer the questions, …
1. accidents 2. fundamental part 3. a. being aware of potential hazards b. following proper safety procedures c. well - planned 4. responsibility; we can ensure 5. a. Wear appropr…
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read the passage from sugar changed the world. no one could have seen i…
Advances in the production of sweeteners hastened the end of involuntary servitude.
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multiple choice question a mental process in which one believes and per…
self - concept
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identify chemical and physical changes that occur as a car ages. physic…
# Explicaciones breves: Los cambios físicos son aquellos en los que la sustancia no cambia su identidad química. Los cambios químicos implican una reacción química y la formación …
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arrange the highlighted bonds in the table below in decreasing order of…
1. P - F 2. S - F 3. Cl - F
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classify each of the following as a physical property or as a chemical …
Blue color: Physical property Density: Physical property Combustibility: Chemical property Boiling point: Physical property Reacts with acid: Chemical property
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determining components of a mixture a chemist mixes a 10% hydrogen pero…
20
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question 4 of 10 why would a lack of neurotransmitters change the funct…
D. Signals travel from neuron to neuron through neurotransmitters.
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section 24.2 radioactive decay in your textbook, read about the changes…
1. a. much less 2. b. 1:1 3. d. neutron 4. d. $^{29}_{14}Si$ 5. c. 20 6. a. 234 7. b. proton 8. a. neutron 9. d. $^{238}_{92}U$ 10. c. $^{150}_{64}Gd$ 11. b. 1.1:1 12. a. $^{4}_{2…
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draw the lewis dot structures for the following (1*5=5 points). show co…
a) For C₂H₄: H are single - bonded to C and there is a C = C double - bond. b) For PO₄³⁻: P is at the center with single - bonded O atoms and lone - pairs on O. c) For CaCl₂: Ca²⁺…
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which of the following lewis symbols is correct? li· ·ge· ·n· ·sb· a b …
a. a.a d. d.MgF2 c. c.NO
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which of the following shows the correct charge distribution in ocs? a.…
d.d ### Question 16
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question 10 which of the following is an ionic compound? d.c3h8 a.co2 c…
Question 10: C. CaO Question 11: A. 8 Question 12: B. lose one electron
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how many moles of ammonia are there in a 346 g sample of pure nh3? o c.…
c. 20.3 mol
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an ionic compound is formed between d. a non - metallic cation and a me…
- Question 1: b. a metallic cation and a non - metallic anion - Question 2: b. $LiNO_3$, $LiNO_2$ - Question 3: a. to show the charge of the metal cation - Question 4: $SrI_2$
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predominant 6 potential points love and loss are predominant themes in …
Love and loss are predominant themes in the author's short stories. Cinnamon and nutmeg are predominant flavors in the spice mixture.
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the protons are generated during oxidation reactions. true or false
True
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when oxygen accepts electrons, water is produced as a byproduct. true o…
True
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part 1 of 2 which is the more stable isomer? select the single best ans…
Part 1 of 2: trans - 1 - ethyl - 4 - methylcyclohexane Part 2 of 2: trans is more stable than cis in 1,4 - disubstituted cyclohexanes because both substituents are equatorial
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what is used to make glass? 1. salt 2. sand 3. clay 4. coal
2. Sand
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brian tutors chemistry. for each hour that he tutors, he earns 40 dolla…
120
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a student proposes the following lewis structure for the phosgene (cocl…
| atom | formal charge | | ---- | ---- | | C | 0 | | O | 0 | | right Cl | 0 | | left Cl | 0 |
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a is made up of atoms that are chemically combined in like nacl or h₂o.…
A. compound B. definite proportion C. covalent bond D. molecule
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question 1 describe the doppler effect it is the change in wavelength o…
Question 1: It is the change in wavelength of radiation due to relative motion of the source with respect to the observer Question 2: It is a planetary model of the atom but where…
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research that links antisocial behavior to a persons brain chemistry, b…
Question 4: C. Neurological dysfunction Question 5: A. True
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what is the chemical that refluxes into the esophagus, causing the burn…
Hydrochloric acid (HCl)
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my first thought is dad is going to kill me. ive never failed anything …
C. Character vs. Self
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12 through the process of ______ oxygen, iron, and water combine to for…
A. oxidation