化学
化学反応、化学量論、分子構造、元素の性質。
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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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besides earth, what other celestial bodies in our solar system may have…
1. Celestial bodies in our solar system that may have oceans include Europa (a moon of Jupiter), Enceladus (a moon of Saturn). Europa is thought to have a subsurface ocean of liqu…
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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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which statement best describes the rhyme scheme of a thought on the ine…
Without the poem text, we cannot accurately determine the answer. But if we were to choose based on common rhyme - scheme knowledge and the options given, more information about t…
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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
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check all the ways listed below that ensure accurate reading of volume …
using subtraction to determine the volume dispensed, making sure that you read the volume with the liquid inside the pipette at eye level, ensuring that air bubbles are not in the…
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1. color is what type of property? a) physical b) chemical 2. reactivit…
1. a) Physical 2. a) Chemical 3. a) Stretching
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which statement best describes the rhyme schemes of the author to her b…
Bradstreet uses couplets throughout; Wheatley uses couplets and inverts sentences as needed for emphasis and to enhance the poem as a song of praise for creation.
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the specific heat capacity of fe is 0.449 j/g°c. a sample of fe was hea…
1. E. 297 2. I. g
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in the author to her book, the main reason bradstreet uses inversion is…
complete the rhyme scheme
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fill in the blank question is the physical and chemical processes that …
lithification
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which represents a decrease in entropy? a) nacl dissolving in water b) …
For the first question: c) condensation of steam on cold glass For the second question: b) disorder
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temperature...(select all that apply; there is more than one correct an…
B. can be given in units of Kelvin, Celsius, or Fahrenheit; D. is a measure of the average kinetic motion of molecules
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true or false 16. elements are the simplest substances. 17. electrical …
16. True 17. False 18. False 19. True 20. True 21. c. diagram C 22. b. diagram B
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question 28 (4 points) the density of water at 30.0 °c is 0.995646 g/ml…
G. 1.4504, J. g/mL
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multiple choice write the letter of the correct answer on the line at t…
1. a 2. c 3. c 4. c 5. b 6. a 7. b
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using science skills use the figure below to answer questions 23, 24 an…
23. a. liquid to gas 24. c. chemical and thermal 25. c. combustion
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the nature of matter 8. which is an example of a chemical change? a. bu…
8. a. burning wood 9. c. energy 10. b. melting ice in a glass of lemonade
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10. which of the following is an example of a change of state? a. pouri…
11. matter 12. chemical 13. energy 14. solution 15. electromagnetic
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question 16 (1 point) a hand grenade resting on the ground is primarily…
- Question 16: B. False - Question 17: A. True
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question 13 (1 point) a mixture of the unreactive noble gases argon and…
Question 13: B. False Question 14: B. False Question 15: A. True
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question 10 (1 point) the speed of light is a constant so there is no n…
Question 10: B. False Question 11: B. False Question 12: B. False
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question 5 (1 point) billie eilish is studying chemistry because she wa…
B. false
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using the following chemical reaction, classify each statement as being…
1. Reactants 2. Both 3. Both 4. Products 5. Reactants
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talaah conducts a chemical reaction and wants to know the number of hyd…
There must be 4 hydrogen atoms in the products, because the total mass is conserved.
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3. the equation below shows a chemical reaction. according to the law o…
$7.32$ grams
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general concepts: match reagents with molecules detected match each rea…
simple sugars: 3. Benedict's protein: 1. biuret starch: 2. iodine
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a scientist performs the following chemical reaction. sicl₄ + 4h₂o → h₄…
8 atoms of hydrogen
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q. 1 a compound secreted by honey - bees to paralyze intruders in their…
Carbon: 6 atoms, Hydrogen: 14 atoms, Oxygen: 1 atom
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a scientist performs the following chemical reaction: sicl₄ + 4h₂o → h₄…
$\text{SiCl}_4$ and $\text{H}_2\text{O}$
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3. using a periodic table, determine how many carbon atoms are in the f…
3
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a scientist performs the following reaction: ch₄ + 2o₂ → co₂ + 2h₂o. ho…
1 atom of carbon, 4 atoms of hydrogen, and 4 atoms of oxygen
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5. how many elements are in 3al₂o₃? 1 4 3 2 clear all
D. 2
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directions: in the hog hilton activity you learned how to fill in elect…
1. Element: Sodium (Na), Electron Configuration: $1s^{2}2s^{2}2p^{6}3s^{1}$ 2. Element: Titanium (Ti), Electron Configuration: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{2}$ 3. Elem…
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tyra creates a model of two unknown substances, a and b. two unidentifi…
Both substances are likely mixtures because they contain two different types of elements that appear to be physically combined rather than chemically bonded. This can be further c…
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5. toby wants to create a model to show how iron (fe) changes when it r…
Iron is an element and should have only one type of atom. Iron oxide is a compound and should have two different types of atoms bonded together in a specific ratio.
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the image shows models of elements, compounds, homogeneous mixtures, an…
A. because it contains two or more types of atoms that are not chemically combined, and the substances are uniformly mixed
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a chemist has a block of aluminum metal (density is 2.7 g/ml). they dro…
6.21
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describe the way a metal will bend, scratch, dent, stretch, or break. m…
A. Mechanical Properties
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2. an atomic - level model of an element would have while 1 type of ato…
Components in a mixture are not Chemically bonded together. A mixture with uniform composition and appearance is a homogeneous mixture.
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2. an atomic - level model of an element would have while - choose the …
An atomic - level model of an element would have: 1 type of atom A model of a compound would have: 2 or more different atoms
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a chemist encounters an unknown metal. they drop the metal into a gradu…
$1.25$
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8) a 475 cm³ sample of gas at standard temperature and pressure is allo…
$345\ K$ For the second - part:
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1. directions choose the correct answer for each row. identify each sub…
Bag of nuts and seeds: Heterogenous Mixture A drink with ice cubes in it: Heterogenous Mixture Oxygen (O): Element Table Salt (NaCl): Compound Air: Homogenous Mixture
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post - lab questions: for each of the following activities, decide if i…
1. Change: Chemical change Justification: Wood reacts with oxygen to form new substances like CO₂, H₂O and ash. 2. Change: Physical change Justification: Only state change from li…
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you have a sample of each of the following five metals, with the mass a…
E. silver, mass = 215 g, d = 10.5 g/cm³
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a chemist is trying to identify an unknown metal and finds that 25.0 cm…
C. copper, $d = 8.98\ g/cm^{3}$
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read the excerpt from the author to her book. thou ill - formd offsprin…
A. A, B, A, B
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4. what would be the new volume if 250 cm³ of gas at 25°c and 730 mm pr…
$220\ cm^3$
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4. in the simulator, experiment by adding each type of particle to your…
4. Protons 5. No 6. Yes 7. Protons and neutrons 8. Yes 9. 2 10. 5 11. 8 12. It becomes a negatively - charged ion.
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chemistry—unit 2 worksheet 4 on each of the problems below, start with …
(1) The new volume is approximately $163mL$. (2) The new pressure is approximately $94.9psi$. (3) The new pressure is approximately $1.67atm$.
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which oral condition does chemotherapy make a patient more susceptible …
Mucositis
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7) chlorine has two possible isotopes. you must use at least one atom o…
Cl - 35 atoms: 77.5% Cl - 37 atoms: 22.5%
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identifying jargon identify the use of jargon in the excerpt by sorting…
Not Jargon: far door, hot side Jargon: air lock, chemical shower, decon cycle, hot agents
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a thermometer shows a temperature of -20\frac{3}{4} degrees. a chemist …
-20.75