化学
化学反应、化学计量、分子结构与元素性质。
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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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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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chemical hazards exist in many forms, including mist, gas, and fibers. …
Liquid
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demareass employer has started using a new industrial cleaner. even tho…
No
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question 4 (1 point) use what you learned from watching the videos to a…
\(X_2Y\)
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select the chemical hazards that can be particularly hazardous to worke…
Carbon monoxide, Hydrogen sulfide, Solvent vapors
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question 5 (1 point) use what you learned from watching the videos to a…
$X_{2}Y_{3}$
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which of the following is most likely to be the correct formula for cal…
There is no correct option given as the correct formula for calcium bromide is $CaBr_{2}$, but if we assume it's a matter of correct elements combination, the closest in terms of …
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a small amount of chemical splashes in franks eye. what should frank do…
use the eyewash station while his lab partner informs the teacher
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exploring properties of water directions: write all answers on the next…
a. A homogeneous mixture is formed because the sodium pentothal dissolves uniformly in water creating a single - phase system with consistent composition. b. Water is a polar solv…
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which statement best describes the formation of a solution? a large amo…
A small amount of solute is dissolved in a larger amount of solvent.
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in which situation can a mixture always be called a solution? when one …
when the mixture is homogeneous
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which of the following is a homogenous mixture? blood steel cloud muddy…
steel
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a solid is stirred into a liquid and dissolves. which type of mixture f…
C. a solution
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which waste items should always be discarded in the hazardous waste con…
A. bacterial cultures
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what are homogeneous mixtures of metals commonly called? alloys colloid…
A. alloys
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which refers to a mixture that contains more than one phase in which th…
C. heterogeneous
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which is a characteristic of a solution? its particles scatter light. i…
Its particles are evenly distributed.
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which substance is an example of a colloid? o milk o tomato juice o san…
A. milk
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according to quizlet, natural phenomena is defined as any event or aspe…
True
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according to quizlet: natural phenomena is defined as any event or aspe…
True
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based on the following balanced equation: 4h₂o + 7co₂ → c₇h₈ + 9o₂. how…
2
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based on the following balanced equation: p₄ + 5o₂ → 2p₂o₅. what is the…
$5O_{2}:2P_{2}O_{5}$
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use the following balanced equation to answer the questions: c + 2s → c…
$64.14\ g$
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background: the normal electron configuration of atoms or ions of an el…
1. Safety: Wear safety goggles, work in a well - ventilated area, keep flammable materials away, use tongs/gloves for hot objects, follow chemical handling procedures. 2. Ground S…
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use the following balanced equation to answer the questions: c + 2s → c…
2
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1. verify that each of the following numbers contains four significant …
1. - a) Significant digits: 4, 1, 8, 2 - b) Significant digits: 4, 9, 4, 1 - c) Significant digits: 3, 2, 0, 1 - d) Significant digits: 3, 0, 0, 2 2. - a) 5 - b) 2 - c) 4 - d) 1 -…
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which of these did you include in your answer? check any that apply. th…
The juice contains sugars, plant pigments, and other chemicals dissolved in water. This is a solution. The pieces of orange pulp will rise to the top or settle to the bottom of th…
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chemquest 2 significant figures name: ave brean date: 9 - 09 - 05 hour:…
1. a) Signficant digits: 4, 1, 8, 2 b) Signficant digits: 4, 9, 4, 1 c) Signficant digits: 3, 2, 0, 1 d) Signficant digits: 3, 0, 0, 2 2. a) 5 b) 2 c) 4 d) 1 e) 6 f) 2
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shaving cream has gas dispersed throughout the cream. what type of mixt…
A. colloid
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ecking all of the terms that apply. salad dressing homogeneous heteroge…
B. heterogeneous E. suspension
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describe the following mixtures by checking all of the terms that apply…
heterogeneous, colloid
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mixtures by checking all of the terms that apply. smoke homogeneous het…
heterogeneous, colloid
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if the partial pressure dropped from 22 to 15 kpa throughout this exper…
A. $0.272$ ml L$^{-1}$ kPa$^{-1}\times40$ L$\times7$ kPa
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describe the following mixtures by checking all of the terms that apply…
homogeneous, solution
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describe the following mixtures by checking all of the terms cranberry …
homogeneous, solution
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1. this passage is mainly about a. stories from africa. b. advice about…
1. Sin conocer el pasaje, no se puede determinar con certeza, pero si se trata de la cafeína, podría ser relacionado con una planta que la contiene. Sin embargo, si no hay más con…
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how many formula units are in 5.5 moles of mgo? ?×10? formula units of …
$3.3121\times 10^{24}$ formula units of MgO
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which statements are true of heterogeneous mixtures? check all that app…
They settle out. They exhibit the Tyndall effect.
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what is the mass of 1.6 mol of cac2? molar mass cac2 = 64.10 g/mol 1.6 …
102.56 g
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which statements are true of solutions? they contain solutes and solven…
They contain solutes and solvents. Their particles must be evenly distributed. They are homogeneous matter.
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what equation shows the correct product and obeys conservation of mass …
Ba + I₂→BaI₂
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what is the missing coefficient to make a balanced equation? 2na + cl₂ …
2
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what is the missing coefficient to make a balanced equation? ?na + cl₂ …
2
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how much p is required to react with 2.7 grams of be to form 8.9 grams …
$6.2$ g
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which techniques would be best for separating a colloid mixture but wou…
B. centrifugation, F. long standing
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which techniques would be best for separating the solute from the solve…
distillation, boiling/heating, crystallization
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what is the molar mass of the covalent compound of2? of2 = ? $\frac{g}{…
54.00 g/mol
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what is the formula for carbon monoxide? co₂ co co₄ c₂o
CO
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what is the name of the compound c4n3? tetracyanide trinitride tetracar…
tetracarbon trinitride
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17 cl 35.45 56 ba 137.33 what is the molar mass of the ionic compound b…
$208.23$
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what is the molar mass of the ionic compound bacl2? bacl2 = ? $\frac{g}…
208.23 g/mol
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figure matter elements of period 2 atomic radius vs. atomic number in t…
Atomic Radius