化学
化学反応、化学量論、分子構造、元素の性質。
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which substances are on the left side of a chemical equation? a the rea…
1. A. the reactants 2. B. an arrow 3. B. the products
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in synthesis reactions, there are always more ____ than a reactants, pr…
1. A. reactants, products 2. B. O 3. B. Decomposition
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a patient has diabetes, a disease that causes high blood sugar levels. …
A. carbohydrates
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match the letter with the color answer a. atomic # 17, used to kill bac…
A. Chlorine Green B. Bromide Brown C. Carbon Red D. Helium Brown E. Nitrogen Blue F. Sodium Blue G. Hydrogen Blue H. Mercury Brown J. Aluminum Brown N. Calcium Yellow O. Magnesium…
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reviewing vocabulary match the vocabulary word to its definition. elect…
electron cloud - the area of the atom surrounding the nucleus where electrons can be found electron - a negatively charged particle that orbits the nucleus of an atom nucleus - th…
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the chemical trimethylamine n - oxide not only gives fish their fishy s…
B. As a result,
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describe electrons. location: charge: mass:
Location: In electron shells around the nucleus Charge: Negative Mass: Approximately 9.109×10⁻³¹ kg
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chemical adjective of, produced or used by chemicals. cancel use this w…
The chemical reaction produced a strange - colored liquid.
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instructions: use the formula for mass to solve the following problems.…
1. $3\ kg$ 2. $4.50\ kg$ 3. $6.14\ kg$ 4. $16.2\ g$ 5. $52.6\ kg$ 6. $3650\ kg$
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when the electrons of a chemical element change energy states, they rel…
B. identifies
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when the electrons of a chemical element change energy states, they rel…
A. identifying
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when the electrons of a chemical element change energy states, they rel…
A. identifying
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conservation of matter states that the reactants have to equal the ____…
1. A. products 2. A. atoms 3. B. 3
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how many no₃ are on the reactant side before being balanced? a 2 b 3 c …
1. Cannot be determined 2. Cannot be determined 3. Cannot be determined
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color by number erosion/weathering/deposition directions: read each que…
1. B. weathering [brown] 2. A. erosion [dark green] 3. C. deposition [purple] 4. C. both A & B [red orange] 5. C. deposition [light brown] 6. B. weathering [white] 7. A. erosion […
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the ____ step in balancing a chemical equation is to take inventory or …
1. A. first 2. C. subscript 3. 2
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comprehension questions for penguin prof chemistry basics part 2 1. wha…
1. Ionic bonds, covalent bonds, hydrogen bonds 2. They have full outer - electron shells. 3. By losing one or more electrons. Example: Sodium loses one electron to become $Na^+$. …
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passage poems great expectations, a novel written by charles dickens (1…
by personifying time as cruel and destructive
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oil and water heterogeneous mixture compound homogeneous mixture pure s…
# Breve explicación: El aceite y el agua no se mezclan uniformemente. Forman capas separadas, lo que significa que es una mezcla heterogénea. Un compuesto es una sustancia formada…
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question 25 bleach mixture heterogeneous mixture homogeneous mixture co…
C. homogeneous mixture
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what is club soda heterogeneous mixture mixture pure substance compound…
# Breve explicación: La soda club es una mezcla de agua y dióxido de carbono disuelto, entre otras sustancias en menor cantidad. Tiene una composición uniforme a nivel macroscópic…
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hydrogen peroxide mixture heterogeneous mixture element compound pure s…
D. compound E. pure substance
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what is air? heterogeneous mixture mixture pure substance compound homo…
homogeneous mixture
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identify each of the phase changes described below. liquid gold is pour…
1. Freezing 2. Vaporizing 3. Melting 4. Condensing 5. Depositing 6. Sublimating
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match the terms with their definition. 1. cohesion 2. capillary action …
1. e 2. g 3. a 4. f 5. d 6. b 7. c 8. b 10. a 11. b 12. blood vessels; against; water
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what is isopropyl alcohol heterogeneous mixture element homogeneous mix…
E. compound, D. pure substance
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what is lemon pledge □ homogeneous mixture □ compound □ pure substance …
homogeneous mixture
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what is vanilla mixture element compound homogeneous mixture pure subst…
heterogeneous mixture
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what is peanut butter mixture element heterogeneous mixture compound ho…
E. homogeneous mixture
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how many moles of lithium are in 25 g of lithium? 25 g li (\\frac{1 mol…
The mass of 11.5 moles of lithium is 79.81 g. For the multiple - choice question: 1 mol
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what is copper sulfate homogeneous mixture heterogeneous mixture compou…
C. compound, E. pure substance
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what quantity are you given to start (number and unit)? □ 11.5 moles li…
11.5 moles Li
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what is oxygen □ homogeneous mixture □ heterogeneous mixture □ mixture …
element, pure substance
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what is carbon pure substance homogeneous mixture heterogeneous mixture…
element
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brass pure substance mixture element heterogeneous mixture homogeneous …
B. mixture, E. homogeneous mixture
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question 13 salt water element pure substance mixture homogeneous mixtu…
C. mixture D. homogeneous mixture
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what is magnesium citrate. mixture heterogeneous mixture pure substance…
# Breve explicación: La citrato de magnesio es una sustancia química formada por átomos de magnesio, carbono, oxígeno e hidrógeno en proporciones fijas. Un compuesto es una sustan…
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what is methane gas pure substance homogeneous mixture heterogeneous mi…
# Explicación breve: El gas metano tiene una fórmula química definida ($CH_4$), formada por átomos de carbono e hidrógeno en proporciones fijas. Un compuesto es una sustancia form…
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the molar mass is the conversion factor (1 mole li = 6.94 grams). what …
6.94 g
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what is charcoal + sand homogeneous mixture pure substance element comp…
# Explicación breve: La mezcla de carbón vegetal y arena no es un sustrato puro. No es un elemento ni un compuesto, ya que está formada por dos sustancias diferentes. Además, es h…
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what is sugar water □ homogeneous mixture □ compound □ pure substance □…
# Breve explicación: El agua de azúcar está formada por dos sustancias distintas (azúcar y agua), lo que la convierte en una mezcla. Además, el azúcar se disuelve uniformemente en…
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mr smith hypoventilates and retains too much co₂. which of the followin…
D. Peripheral chemoreceptors
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what is steel wool. homogeneous mixture mixture compound heterogeneous …
heterogeneous mixture
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razonamiento explique por qué su evidencia respalda su afirmación: • es…
- Esta evidencia apoya mi afirmación porque un cambio químico significa la formación de nuevas sustancias. - Un cambio químico forma nuevas sustancias con propiedades químicas dif…
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what is the sos pad □ homogeneous mixture □ mixture □ compound □ elemen…
heterogeneous mixture
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what type of substance is water compound element heterogeneous mixture …
compound, pure substance
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what is copper? homogeneous mixture mixture compound element pure subst…
# Breve explicación: El cobre es un elemento químico con el símbolo Cu y número atómico 29. Un elemento es una sustancia pura que está formada por un solo tipo de átomo. Además, l…
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what type of substance is salt pure substance homogeneous mixture heter…
compound
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what type of substance is baking soda □ homogeneous mixture □ element □…
compound
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what type of substance is sugar, pure substance element mixture heterog…
# Breve explicación: La azúcar es una sustancia formada por átomos de carbono, hidrógeno y oxígeno unidos químicamente en proporciones fijas. Un compuesto es una sustancia pura fo…
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what type of material is pond water heterogeneous mixture element homog…
# Breve explicación: El agua de un estanque no es una sustancia pura. Contiene partículas disueltas, organismos vivos y otros componentes. Un elemento es una sustancia que no pued…
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theoretical yield is the amount of product that would be obtained in an…
The blank should be filled with "ideal" as theoretical yield is based on a perfect or ideal - reaction scenario where there are no side - reactions, losses, etc.
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stoichiometry calculations often involve converting between moles and
mass (or grams)
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the process of adjusting reaction conditions to obtain the highest poss…
The statement is True.
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percent measures the efficiency of a chemical reaction.
yield
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the teen wanted to see how he might reduce the surface tension of water…
Accuracy in experimentation requires careful timing to ensure proper measurement.
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3. for each of the following isotopes, write the number of | | chromium…
| | Chromium - 58 | Chromium - 63 | |--|--|--| | # of $P+$ | 24 | 24 | | # of $e-$ | 24 | 24 | | # of $N$ | 34 | 39 |
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which electrons of an atom are most reactive? those that are the farthe…
those that are the farthest away from the positive atomic nucleus
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the groups of the periodic table are organized by the number of valence…
True
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1. here are three isotopes of an element: a. the element is: __________…
a. Carbon b. Mass numbers c. 6, 6 d. 6, 7 e. 6, 8
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39. chemical analysis of fossils can reveal: exact genetic sequences in…
Information about ancient atmospheric conditions
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multiple - choice question what property of carbon makes it so versatil…
It has 4 valence electrons
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which two elements are most likely ductile? a. c and p b. zn and n c. s…
D. Ag and Au
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17. complete the electron configuration for the following element: d. m…
[Ne]3s²
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matter 9. three students made multiple weighings of a copper - cylinder…
10a) PHY 10b) CHM 10c) CHM 10d) PHY 10e) PHY 10f) CHM 10g) PHY 10h) CHM 10i) PHY 11a) CHM 11b) CHM 11c) PHY 11d) CHM 11e) PHY 11f) PHY 11g) PHY 11h) CHM 11i) PHY 12) A. True 13) B…
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18. complete the noble gas notation for the following element: e. selen…
\([Ar]4s^{2}3d^{10}4p^{4}\)
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which group of elements contains the most reactive metals? a. metalloid…
B. alkali metals
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15. which process involves heat transfer from molecule to molecule? rad…
conduction
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14. why do dark - colored objects absorb radiant energy faster than lig…
None of the above options are correct.
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14. why do dark - colored objects absorb radiant energy faster than lig…
None of the provided options are correct.
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11. how many electrons can each sublevel hold? a. s- b. p- c. d- d. f- …
11. a. 2, b. 6, c. 10, d. 14 12. 2; opposite 13. ground 14. S 15. 20 17. \(1s^{2}2s^{2}2p^{6}3s^{2}\) 18. \([Ar]3d^{10}4s^{2}4p^{4}\)
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what statement is true about the eight elements on the periodic table t…
D. They have properties of both metals and nonmetals.
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which determines the identity of an element? a. number of energy levels…
C. number of protons inside the nucleus
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in an experiment, 16.0 g of so₂ is treated with 6.0 g of o₂. if so₃ is …
E. 15.0 g
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question 3 of 3 which of the following are forms that chemical hazards …
Mist, Gas, Liquid
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which of the following answer options are chemical hazards found on con…
Solvents, Asbestos, Silica, Lead, Flammable chemicals, Carbon monoxide, Hydrogen sulfide
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properties of four elements were determined and the location of each el…
C. Element Y
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6) examine the prefixes in model 2 below. fill in the numerical value t…
7) -ide 8) When there is one atom of the first element. 9) Phosphorus tribromide, Sulfur tetrachloride, Dinitrogen difluoride, Sulfur trioxide, Bromine monofluoride 10) $S_2F_{10}…
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atomic models and experiments quarter 1 study guide 1. look at the mode…
1. a) If it's Dalton's model, parts of his theory: atoms are indivisible, atoms of same element are identical, atoms combine in simple whole - number ratios, chemical reactions ar…
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unit 2 - lesson 22 modeling the valence of atoms element symbol valence…
| Element | Symbol | Valence Electrons | Ion Charge | | ---- | ---- | ---- | ---- | | Aluminum | Al | 3 | + 3 | | Sulfur | S | 6 | - 2 | | Calcium | Ca | 2 | + 2 |
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chemistry: exam 3 test review 1. what is the name of the group of eleme…
1. Noble gases 2. Alkali metals (metals) and halogens (non - metals) 3. The same number of electron shells 4. An electron in the outermost shell of an atom, involved in chemical b…
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use the quotation to answer questions 13 and 14. from this view of the …
D. It provided an effective system of representative government
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use the quotation to answer questions 13 and 14. from this view of the …
B. They wished to prevent the division of the country into rival political groups.
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sonnet i by gwendolyn bennett he came in silver armour, trimmed with bl…
1. Underline and bold "Death" and other relevant words like "sword", "armour" for dark - theme build - up. 2. Color - code the rhyme scheme according to the pattern ABAB CDCD EFEF…
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1. how does the principle of conservation of energy relate to chemical …
1. The total energy is conserved in chemical reactions, with energy converting between forms. 2. Activation energy is the minimum energy for reaction - initiating collisions and a…
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6) what is the significance of the maxwell - boltzmann distribution in …
## Question 6: B. It depicts the distribution of molecular speeds ## Question 7: C. Influencing the directionality and spontaneity of reactions ## Question 8: B. It explains behav…
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which among the following cancer treatment methods was devised by the e…
Nanocapsules
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instructions: for each one, read the question, highlight the answer, an…
1. B. Due to rearrangement and bonding changes of atoms 2. B. Energy is only transformed from one form to another 3. B. They provide an alternative pathway with a lower activation…
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naming ionic compounds practice worksheet name the following ionic comp…
1. ammonium chloride 2. iron(III) nitrate 3. titanium(III) bromide 4. copper(I) phosphide 5. tin(IV) selenide 6. gallium arsenide 7. lead(IV) sulfate 8. beryllium bicarbonate 9. s…
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which of the following is an acceptable set of quantum numbers to descr…
D. $n = 2$, $l = 1$, $m_l=-1$
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what is the ppt of a 500ml sample of water with 29 grams of dissolved s…
38 ppt (Note: This is an approximation - based selection as the calculated value is around 54.82 - 58 depending on the approximation method, and 38 ppt is the closest among the gi…
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what is the bond order of the s - o bonds in the following? a. 1.00 b. …
B. 1.33
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question #2 which set of observations is evidence that a chemical react…
Question #1: C. reactivity Question #2: C. reactivity
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fill - in - the blank questions: instructions: read the question and th…
1. conservation 2. electrostatic 3. activation 4. catalysts 5. molecular 6. electrons 7. thermodynamics 8. entropy 9. quantum 10. equilibrium
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10. a student kept a notebook during an investigation. which recorded o…
The color of two mixed solutions changed from clear to white.
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when frozen carbon dioxide (co2) is heated, it changes directly into a …
Heat caused a change in state
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obsidian hydration dating (ohd), an artifact - dating technique that me…
B. composition, though:
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5. students performed an investigation on how aluminum cans taken to a …
B. a physical change because the material remains the same
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obsidian hydration dating (ohd), an artifact - dating technique that me…
B. composition, though:
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students observe a burning candle to study the changes in matter. which…
The burning wick and the melting wax are both types of physical and chemical changes.