Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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lesson objective students will differentiate between physical and chemi…
Claim: I claim that a phase change is a physical change because the chemical identity of the substance remains the same during a phase change. Evidence: My evidence is that when a…
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18. kmt stands for______ kinetic muscular timing kinetic molecular theo…
B. Kinetic Molecular Theory ### 13.
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lesson objective students will be able to differentiate between physica…
Claim: physical Evidence: - My evidence is that when a melting happens, the substance is still the same substance chemically. - Another piece of evidence is when boiling occurs, n…
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11. if the pressure exerted by a gas at 25 degrees c in a volume of 0.0…
11. C. 0.0069 mol 8. C. 298
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multiple - choice question ______ deals with heated molecules moving aw…
C. convection
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name: date: physical and chemical properties worksheet **identify if th…
# Explicación paso a paso: ## Paso 1: Definir propiedades físicas y químicas Las propiedades físicas se pueden medir o observar sin que el material cambie su composición química. …
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1. where does the name atom come from? 2. what were daltons five postul…
1. The word "atom" comes from the Greek word "atomos" meaning indivisible. 2. - a. Elements are composed of atoms. - b. All atoms of a given element are identical. - c. Compounds …
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name warm up sept 18th be prepared for a quiz tomorrow (sept 19th frida…
$BaBr_2<AlBr_3<BaCl_2<AlCl_3$
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between the right and left hemispheres. what was gwen born without? 12.…
12. Decrease in neurotransmitters like acetylcholine. 13. Parasympathetic nervous system. 14. Thalamus. 15. Vision. 16. Serotonin. 17. Right post - central gyrus (parietal lobe). …
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12. saras grandfather has developed alzheimers disease. what can you te…
12. Widespread changes in neurotransmitters (e.g., reduced acetylcholine). 13. Parasympathetic nervous system. 14. Thalamus. 15. Vision (due to occipital lobe damage). 16. Seroton…
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complete the paragraph to explain why water is a polar molecule. in a m…
In a molecule of water, the oxygen atom shares **electrons** with each hydrogen atom. Oxygen also has **two nonbonding pairs of** electrons. Because valence electrons are more att…
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chemistry: a chemist looks up several unknown substances to determine t…
no
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question 2. classify each of the following as a homogeneous or heteroge…
(a) Homogeneous Mixture (b) Homogeneous Mixture (c) Heterogeneous Mixture (d) Heterogeneous Mixture
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xit ticket 7 (module 2 - lesson 5) question 1. what is the difference b…
A pure substance has a fixed and definite composition, either an element (made of one - type of atom) or a compound (made of two or more types of atoms chemically combined in a fi…
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additional chemical hazards training must be provided to employees: ann…
When new hazards are introduced into the workplace
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question 10. which of the following statements are true regarding the r…
Energy is always involved when physical or chemical changes occur. Heat can provide enough energy to cause both physical changes (such as melting) and chemical changes (such as th…
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to boost the performance of oil - absorbing resins, which are used to r…
A. For both toluene and trichloromethane, the BZMA - derived resin exhibited only modestly lower absorption capacity than the resin synthesized from β - cyclodextrin but higher ab…
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blandine courel and her colleagues analyzed pottery fragments from thir…
A. Across the Volga and Don basins, people had broadly similar access to the same terrestrial and aquatic animal resources.
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2. the yearly catch of fish from natural waters is a. increasing. b. ho…
2. b. holding constant or decreasing 3. d. ocean water 4. d. water is lost through evaporation 5. b. located in tidal areas 6. a. fish density 7. c. the more difficult the managem…
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your slide deck presentation is about renewable energy. what should you…
copying your full speaking notes verbatim
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in this experiment, you will change the temperature and particle size o…
How do temperature and particle size of an antacid tablet affect the rate of the reaction?
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what is a function of the integumentary system? (1 point) absorbs water…
forms blood clots
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question 3. some physical properties of two samples of iodine - 127 at …
B. states of matter
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each layer of earth has different physical and chemical properties. thi…
Composition of the layers
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match each description to the correct term. solid liquid gas matter tha…
Solid: Matter that has a definite shape and volume. Liquid: Matter that has a definite volume and takes the shape of its container. Gas: Matter that takes both the shape and volum…
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soft or nourishment. our present ways of living have, i think, been dis…
D. uncut 15. Since there is no chart provided, we cannot answer this question. 16.
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1. when a substance changes from a solid to a liquid, it is undergoing …
1. c. Melting 2. c. Condensation 3. d. Condensation 4. c. It remains constant
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21 true or false? taste is not a physical property of matter. a) false …
b) true
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acid rain is a dilute solution of acids that dissolve the calcium carbo…
Acid concentration affects reaction rate. Concentrated acids react faster. Statues with intricate carvings have larger surface - area exposed to acid rain, so they break down more…
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12. in which state does matter completely fill its closed container? a)…
12. b) Gas 14. b) Solid 20. d) Condensation 21. b) true 22. d) a lake
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reactant a can participate in both of these reactions: 1) a + b → c + d…
The activation energy of Reaction 1 is lower than that of Reaction 2.
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select the correct collision theory explanation for changing the rate o…
- Refrigerate food to keep it from spoiling: Particles collide less frequently (due to lower temperature). - Add inert water to a reaction solution: Particles collide less frequen…
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select the correct collision theory explanation for changing the rate o…
1. Refrigerating food: Decreases reaction rate by reducing collision frequency and energy. 2. Raising boiling point with a pressure - cooker: Increases reaction rate by increasing…
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select the correct collision theory explanation for changing the rate o…
1. Decrease reaction rate by lowering temperature (decreasing collision frequency). 2. Increase reaction rate by increasing temperature (increasing collision frequency). 3. Decrea…
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magnesium reacts with hydrochloric acid to form hydrogen gas and magnes…
using hot hydrochloric acid solution, using magnesium powder instead of a large piece of magnesium
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magnesium reacts with hydrochloric acid to form hydrogen gas and magnes…
using hot hydrochloric acid solution, using magnesium powder instead of a large piece of magnesium
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for the questions below determine if the particle that is described in …
5. Charge: no charge, Is this an atom or an ion?: atom 6. Charge: negative, Is this an atom or an ion?: ion 7. Charge: positive, Is this an atom or an ion?: ion 8. Charge: positiv…
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use the text to compare and contrast synthetic glue and natural glue. f…
Takes a long time to dry: Synthetic glue - □, Natural glue - ■ Hard to wash off: Synthetic glue - ■, Natural glue - □ Gets weaker with age: Synthetic glue - □, Natural glue - ■
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which of these is a common use for an erlenmeyer flask? it is used for …
It is used for swirling the contents during a reaction to help mixing.
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why are stirring rods normally made of glass? the glass protects the us…
The glass reduces the likelihood of the rod reacting with the liquid.
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what is the equipment marked with the arrow? graduated cylinder stirrin…
stirring rod
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what is the purpose of a funnel? it allows for catching and directing t…
It allows for catching and directing the flow of liquids.
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which of these is a common use for a graduated cylinder? for containing…
for making precise measurements
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how can a petri dish be used in chemistry? it allows for catching and d…
It is used for making different reactions visible in a wider space.
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what is the symbol for oxygen? ox og o oy
C. O
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what is the symbol for nitrogen? ni n nr nt
B. N
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what is the symbol for carbon? ca cr c cn
C. C
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what is the symbol for magnesium? m mg mn ma
B. Mg
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what is the symbol for fluorine? fl fr fn f
D. F
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chemistry drill - elements 1 what is the symbol for lithium? l lt li tl
C. Li
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building blocks can be used as an analogy for how compounds are formed.…
The model may oversimplify complex chemical interactions.
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which of these is a potential limitation of using this simulation to st…
It may oversimplify real - world conditions, making it harder to apply this understanding.
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if a scientist tells us that two atoms separate from one another, what …
Microscopic
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models in chemistry. if we say \the circle is blue,\ what kind of obser…
B. Macroscopic
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which type of chemistry uses experimentation and equipment to identify …
A. Analytical Chemistry
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which type of chemistry studies changes to the nucleus of the atom? org…
C. Nuclear Chemistry
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what in the world isnt chemistr... which type of chemistry studies how …
D. Biochemistry
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which type of chemistry would study gasoline, a carbon - based molecule…
D. Organic Chemistry
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which type of chemistry studies carbon - based molecules? biochemistry …
C. Organic Chemistry
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which type of chemistry involves analyzing chemical evidence? nuclear c…
C. Analytical Chemistry
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which of these is an example of chemistry you might have contact with i…
Shampoo for your hair
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nucleus. can you describe 3 ways which (or three properties of) the rel…
Please refer to the above - step - by - step explanations for answers to each part of the question.
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looking at how certain physical and chemical characteristics affect foo…
A. food science
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4) choose the best answer. ____ is the ability of a solution to include…
C. Supersaturation
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3) choose the best answer. the ____ is the limit at which a solvent can…
B. saturation point
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2) choose the best answer. a solution in which the rates of crystalliza…
B. dynamic equilibrium
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1) choose the best answer. what determines how much, if any, of a solut…
D. saturation
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5) choose the best answer using the picture of the measuring tool. a(n)…
B. unsaturated solution
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6) choose the best answer using the picture of the measuring tool. suga…
B. are crystals
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7) choose all that apply. what are the three states of saturation? supe…
A. supersaturated C. unsaturated E. saturated
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8) choose the correct term that completes each sentence. olivia added s…
1. Unsaturated 2. Saturated 3. Supersaturated
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9) choose the best answer. the process of dissolving a substance is ___…
dissolution
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10) choose the best answer. according to the graph, what can you conclu…
Solubility increases as temperature increases.
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11) choose the best answer. ____ affects dissolution because dissolutio…
Size of the solid
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____ aids dissolution because it disperses—or spreads out—the solute mo…
1. C. Stirring or agitation 2. A. Pressure
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14) choose the best answer. carbon dioxide gas escaping a soft - drink …
A. pressure
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when food is heated, what parts of the food begin to move so fast that …
D. molecules
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what is it called when direct heat browns the food, thereby releasing v…
A. caramelization
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1 classify each of the following as an extensive or intensive property …
1. a. Extensive b. Extensive c. Extensive d. Intensive e. Intensive f. Intensive 2. a. Physical b. Chemical c. Physical d. Chemical e. Physical 3. Kilo - , Hecto - , Deca - , Base…
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an ebony carving has a mass of 273 g and a volume of 207 cm³. express y…
Part A: Value: $1.32$, Units: $g/cm^{3}$ Part B: Value: $7.27$, Units: $g/cm^{3}$ Part C: Value: $0.791$, Units: $g/cm^{3}$
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3. what was the sum of the mass your separated components? 0.612 g nacl…
The sum of the separated components is $4.124$ g. Reasons for the mass - difference: chemical reactions, adhesion, and volatilization.
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8-11.give the elemental symbol for the element with the greater ______ …
1. K 2. Mg 3. Cl 4. $S^{2 - }$
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4-7. give the elemental symbol for the element with the greater ionizat…
1. Cl 2. Ca 3. La 4. N
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3. give one elemental symbol for each of the following ______ a noble g…
He Ca Na Cl
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2. give one elemental symbol for each of the following ______ a transit…
1. Fe (for transition metal) 2. U (for inner transition metal) 3. La (for rare earth) 4. Si (for metalloid)
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1. give one elemental symbol for each of the following ______ a represe…
1. N 2. Na 3. He 4. Fe
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properties and density worksheet what is the difference between an inte…
| Property | Extensive or Intensive Property | Physical or Chemical Property | |--|--|--| | color | Intensive | Physical | | combustibility | Intensive | Chemical | | hardness | I…
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post lab questions 1. briefly describe the best method for separating e…
a. Evaporation b. Distillation c. Evaporation d. Filtration e. Filtration
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2. what is the difference between a food and a nutrient? is bread a foo…
1. A food is a substance consumed to provide nutritional support for the body. It is a complex mixture of various components. A nutrient is a substance that provides nourishment e…
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13. which state of matter has a fixed shape and volume and its molecule…
14. b) Solid 20. d) Condensation 21. b) True 22. d) a lake
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match the skin diseases to their correct descriptions: 1. caused by a f…
1. Athlete's Foot 2. Impetigo 3. Candidiasis 4. Eczema 5. Dandruff 6. Eczema (Eczema can also be caused by allergic reactions)
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26. a cook preps a beef tenderloin on a cutting board and then immediat…
26. A. Using contaminated equipment 27. A. Preschool - age children 28. C. The grandparents in their seventies 29. B. Their immune systems are not yet fully developed. 30. B. Ensu…
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an element has two isotopes. calculate the (weighted) average atomic ma…
1. D. 61.282537 2. E. 24.188563 3. C. 85.471
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what is a sign of a chemical change? a) compressing b) boiling c) teari…
4. Combustion 5. b) Atoms change their arrangement and motion 6. a) Atoms bond together differently 7. b) Water evaporation
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which statement best describes the rhyme scheme of “a thought on the in…
We need the poem "A Thought on the Inestimable Blessing of Reason" to accurately determine the rhyme scheme. But based on the options: If the first and third, and second and fourt…
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macronutrients? micronutrients? 9. can you complete the table below wit…
| Size (macro or micro??) | Major Class | Organic(contains C, H)) | Measure | Energy? | | ---- | ---- | ---- | ---- | ---- | | macro | Carbohydrate | organic | grams | 4 kcals / g…
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macronutrients? micronutrients? 9. can you complete the table below wit…
| Size (macro or micro??) | Major Class | Organic(contains C, H)) | Measure | Energy? | |---|---|---|---|---| | macro | Triglyceride (fat) | organic | grams | 9 kcals / gm | | mac…
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question 37 (4 points) the mass of a single carbon - 12 atom in amu is …
1. B. 12.0000 2. C. 1.9927×10⁻²³
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you mixed two liquids and a precipitate formed, what kind of change occ…
1. a) Chemical 2. c) Physical change because the sugar is just getting smaller 3. a) Tear, b) Compress, d) Shatter
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the ion $^{75}as^{- 3}$ contains (as is element 33, you should have a c…
1. C. 33 2. J. 42 3. F. 36 4. A. 75