Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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molecules are ○ three or more atoms held together by chemical bonds ○ t…
two or more atoms held together by chemical bonds ### Second Question (Electrons have a ____ charge):
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14. an agency of the usa department of labor whose function is to regul…
Occupational Safety and Health Administration (OSHA) ### Question 15
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life depends on this important element ○ carbon ○ boron ○ lithium ○ oxy…
A. Carbon ### Second Question: "Compounds are"
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25 match the following examples with the correct answer. choices may be…
To solve this, we analyze each substance based on the definitions of solution, suspension, and emulsion: - **Witch hazel**: A homogeneous mixture (solute dissolved in solvent), so…
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8. pathogen is transmitted from contaminated surfaces such as food or e…
Fomite transmission ### Question 9
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question 4 / 4 which number does not have three significant figures? a.…
D. 700 mL
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match the descriptions below to either metal or nonmetal. good conducto…
- Good conductors of heat and electricity: metals - Found on the left side of the Periodic Table: metals - Solids are usually brittle: nonmetals - Malleable and lustrous: metals -…
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how many significant figures are in 0.0320 g? a. one b. two c. three d.…
C. Three
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which element will demonstrate similar reactivity that sulfur has? ○ ch…
Oxygen
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question 3 / 4 how many significant figures are in 0.0320 g? a. one b. …
C. Three
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metals are located on the blank of the periodic table, and nonmetals ar…
Metals are located on the left side of the periodic table, and nonmetals are located on the right side. Metalloids are located on the zigzag line of the periodic table.
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the first \periodic table\ was created by △ who arranged the elements b…
First "periodic table": Created by John Newlands, arranged by atomic mass (law of octaves). Current periodic table: Created by Dmitri Mendeleev (foundation) / Henry Moseley (moder…
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what is the atomic number of the next element in the same period as pho…
16 (corresponding to the option "16")
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periodic table assignment which letter represents periods on the period…
1. A 2. B
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in period 3, there are 8 elements. what sublevel(s)/orbitals is(are) be…
s, p
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the horizontal rows on a periodic table have the same question #elsic |…
number of energy levels/ rings
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what is the atomic number of the next element in the same group as bery…
D. 12 (assuming the last option is 12, as per the context of Group 2 elements; Beryllium is in Group 2, next element is Magnesium with atomic number 12)
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in period 5, there are 18 elements. what sublevel(s)/orbitals is(are) b…
A. s, B. p, C. d
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the number of valence electrons in group 13 is ______. ○ 13 ○ 3 ○ 5 ○ t…
B. 3 (assuming the options are labeled as A. 13, B. 3, C. 5, D. the same as it’s period number)
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all ____ formed ____ two more ____ molecule ____ solvent: water ____ al…
1. All \(\boldsymbol{\text{compounds}}\) (or \(\boldsymbol{\text{substances}}\)) formed \(\boldsymbol{\text{by}}\) two or more \(\boldsymbol{\text{atoms}}\) of a \(\boldsymbol{\te…
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question 5 (essay worth 4 points) which of the following is an example …
Rusting iron
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when heat energy is added, two changes are observed: change a: solid ch…
A is melting and B is sublimation. (The option corresponding to "A is melting and B is sublimation" among the given choices)
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air ______ bone formed ______ two or more ______ molecule ______ solven…
1. For the "molecule formation" part: A molecule is formed when two or more atoms bond. For water, a water molecule ($H_2O$) is formed from two hydrogen atoms and one oxygen atom.…
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which of the following is a sign a chemical reaction has occurred? a so…
A solid forms when two liquids are mixed.
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20. which most accurately describes the structure of an atom? image of …
B. Protons and Neutrons are in the nucleus. Electrons surround it. (Note: Assuming the second option is labeled as B; adjust the label based on the actual question's numbering if …
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20 match the following attributes with the correct answer. choices may …
To solve this matching problem, we analyze each attribute based on the definitions of pure substances, physical mixtures, and chemical compounds: ### 1. "created through a reactio…
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question 1-8 you are testing how well different dish soaps clean grease…
Type of dish soap used
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a student records the following data during a wetland visit: \the water…
The statement about a chemical spill is an inference because it attempts to explain the cause of the observations ### Second Sub - Question (Independent Variable)
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physical and chemical properties worksheet circle the choice that best …
both ### Question 2
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8. into the bushes fled the frightened rabbit. 9. to stay strong, i pra…
Subject: \underline{your sister}; Verbs: \underline{\underline{did}}, \underline{\underline{go}} ### 2. Sentence: All of the packages were delivered.
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15 ____________________ refers to either the loss of oxygen or the addi…
Reduction ### Question 16
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describing the amount of product in a chemical equation marcia is given…
Marcia can use the law of conservation of mass (conservation of atoms). This law states that the number of atoms of each element in reactants equals that in products. Since the pr…
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why does ice float when it is placed in liquid water? because the densi…
because the density of ice is less than water
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identify each part of this chemical equation, which describes the break…
A (the entire green box): Chemical Equation B (the blue box): Reactant C (the arrow): Reaction Arrow (Yield Sign) D (the purple box): Products
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3. a student is writing an essay about the health benefits of organic p…
B. www.pacificuniversity.edu/organic: a website that provides recent research studies conducted on the impact of organic produce on the human body
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a student is performing a chemical reaction. the mass of reactant 1 is …
64 grams (corresponding to the option "64 grams")
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which of the following is a bond defined by the sharing of electrons be…
A. Covalent Bond
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the number 3 in 3o₂ indicates that there are (1 point) 3 subscripts thr…
Three molecules of \( O_2 \) (diatomic Oxygen)
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the gaseous state of matter is found between the solid and liquid state…
b. FALSE
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name: ____________ teacher: ____________ q1 chemistry: u1l6 mixture sep…
Left technique: Filtration. Separates sand and salt (after dissolving in water: filter sand, evaporate salt from filtrate). Right technique: Distillation. Separates salt and water…
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suppose you have three identical test tubes that contain equal masses o…
b. Gas: It expands to fill the container.
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which of the following best describe gas particles? select all that app…
a. moving randomly, b. collide into each other, d. high kinetic energy
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physical properties are characteristics that can be observed without ch…
The color of the pufferfish's scales
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choose the correct answer. is the freezing, melting, and evaporation of…
yes
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choose the correct answer. if a snowflake melted and then changed to a …
A. yes
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choose the correct answer. when a snowflake changes from a solid to a l…
yes
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part iv - atomic structure properties 1. build any atom you want with 1…
The atom built is Carbon (with 6 protons). ### Question 2
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prepwork part 1: directions: read the scenario below and answer the que…
Paper chromatography. It can separate the mixture of pigments in marker ink by using a solvent to carry the ink components up the paper; different pigments move at different rates…
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which of the following is a physical change? a burning b melting c rust…
b. melting
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question 7 chest pain associated with coronary artery disease is called…
C. angina.
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which example is a physical change? a rusting of a nail b burning of fu…
c. breaking of glass
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which type of color scheme does this chart show? monthly mean daily low…
b. Diverging color scheme
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which one among the following represents a physical change? a rusting o…
d. Melting of wax
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which of the following is an irreversible physical change? a melting a …
b. sharpening a pencil
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describing the purpose of a chemical... in your own words, describe the…
The purpose of a chemical equation is to represent a chemical reaction, showing reactants (substances reacting) and products (substances formed), their molar ratios (via coefficie…
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physical changes can be brought about by which of the following? select…
a. cutting, b. bending, c. dissolving
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part ii - building atoms of elements • build the following atoms of ele…
### First Row (Add 5 protons, 6 neutrons, 5 electrons) # Explanation: ## Step1: Determine protons The number of protons is given as 5, so \( p = 5 \). ## Step2: Determine neutrons…
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atomic structure practice o copying\ atomic # | symbol | element name |…
In the nucleus of the atom. ### b)
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how is a poem’s rhyme scheme marked and identified? ○ upper or lowercas…
A. upper or lowercase letters, such as "ABAB"
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crafting poetic verses alliterate anthem captivate communicate connect …
(for marking "RHYMING"): Mark the horizontal sequence of letters in the first row: R (column 2), H (column 3), Y (column 4), M (column 5), I (column 6), N (column 7), G (column 8).
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11. hoodoos are tall stru of sedimentary rock. both and help to create …
The processes that help create hoodoos are **erosion (specifically wind erosion and water erosion, often from rain/snowmelt)** and **weathering (like chemical weathering from mine…
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14. what is the first thing you should always do in lab? type a response
Put on appropriate personal protective equipment (PPE), such as safety goggles, lab coat, and gloves (or follow the specific safety protocols and instructions given by the lab sup…
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predict the products of this organic reaction: ch₂=c(ch₃)-c(=ch₂)-ch=ch…
The product of the catalytic hydrogenation reaction is \(\boldsymbol{\ce{CH3CH(CH3)CH2CH2CH2CH3}}\) (or 2 - methylhexane in IUPAC nomenclature, with the condensed structure as sho…
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while researching a topic, a student has taken the following notes: - r…
A. Dichloromethane, a hydrochlorocarbon, is composed of hydrogen, chlorine, and carbon; tetrafluorohexane, a perfluorocarbon, is composed of fluorine and carbon.
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the following (cyclohexane ring with double bond to ch₂) $xrightarrow{1…
The product \( \boldsymbol{A} \) is cyclohexylmethanol (structure: \( \ce{C6H11 - CH2 - OH} \)).
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day four: complex sentence punctuation exercise 7: punctuate complex se…
s (Exercise 7 Final Punctuated Sentences): 1. She had a habit of drawing beautiful flowers when she was bored. 2. Because so many boys always asked to go to the bathroom, Ms Brook…
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group a trial 1: 11.1 ml, trial 2: 12.4 ml, trial 3: 21.0 ml, trial 4: …
Group B's data is more precise.
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luther accidentally spilled his chemicals, and they splashed onto his a…
A. safety shower
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7. which of the following lab safety rules is not true? be sure to disp…
A. Be sure to dispose of all chemicals down the sink drain, rather than the trashcan.
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objective: to make a compound from a mixture. materials: iron, sulfur, …
A mixture is a combination of two or more substances that retain their individual properties and are not chemically combined. The iron - sulfur mixture is a heterogeneous mixture.…
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exnc. 71–72: solve part (a) and use the answers to parts (b) and (c) 71…
\( |w - 148| \leq 2 \) ### Problem 74:
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cookware companies have been using a chemical called c-8, which helps t…
B. cookware manufacturers who make pans out of steel only
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read the passage. there are several questions about this passage. stink…
3. Paragraph 4 explains that the sulfur on Io comes from volcanoes, and paragraphs 5 - 8 explain why Io has so many volcanoes.
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evaluating scientific explanations pre-test complete 1 2 3 4 5 which is…
B. by replicating experiments
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read the passage. there are several questions about this passage. stink…
3. It gives reasons that the volcanic activity on Io is extraordinary. ### Part B
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read the passage. there are several questions about this passage. stink…
4. Large quantities of sulfur make Io the smelliest place in the Solar System. ### Part B
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read the passage. there are several questions about this passage. stink…
3. the contrast between the smell of Io and other smelly places in the Solar System
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the idea of invisible ink had been around for a long time. write using …
British agents used invisible ink to send secret messages.
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2. using the graduated cylinder to the right, select the most accurate …
22.0 mL
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59 |3x - 9| > 0 60 |5x + 2| ≥ 0 63 \\left|\\frac{2 - 3x}{5}\ ight| = 2 …
\(x=-2\) or \(x = - 8\) #### Part (b): Solve \(|x + 5|\lt3\)
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the most common ways to treat cancer include ______. a. chemotherapy, r…
A. chemotherapy, radiation, and surgery
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dense than liquid water. when water molecules reach the freezing point …
San Francisco, being near the ocean (with large water bodies), has a more stable year - round temperature (less extreme) because water's high heat capacity moderates temperature (…
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number 4. draw a circle around the box with a line across the ci dissol…
less ### For the question "If frozen water were more dense than liquid water, what would happen to the water on Earth if that were the case?"
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give one possibility for the mystery reactant r in this organic reactio…
One possible reactant \( R \) is 2 - methyl - 2 - butene, whose skeletal structure is: ``` CH3 | CH3 - C = CH - CH3 ``` (In skeletal line structure, this is represented as: ``` C …
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1. select the \atom\ simulation, and build an atom with the following c…
- **Núcleo**: Dibuja un área central con 3 "P" (protones) y 4 "N" (neutrones) agrupados. - **Electrones**: Dibuja 3 "E" en órbitas (ej. círculos/elipses) alrededor del núcleo, mos…
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states of matter crossword across 3. change of a gas to a liquid 6. thi…
To solve the "States of Matter Crossword", we analyze each clue: ### Across Clues: 3. **Change of a gas to a liquid** → *Condensation* (process of gas → liquid). 6. **This type of…
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6. five ml of ethanol has a mass of 3.9 g, and 5.0 ml of benzene has a …
Benzene is denser.
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which dissolves more substances, sulfuric acid or water? sulfuric acid …
water (the checkbox next to "water" should be selected)
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what charge does the oxygen end of a water molecule have? slightly nega…
slightly negative
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d) healthcare providers giving accurate information 13. when analyzing …
d) All of the above ### Question 14
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part e how would you conduct your investigation? in your answer, explai…
To conduct the investigation (using a plant growth experiment as an example): 1. **Independent Variable (IV)**: The type of fertilizer (e.g., organic, synthetic, or no fertilizer …
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the image shows a molecular model of a compound using balls and sticks.…
B. The balls must be the same color.
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what is one of the four unique properties of water? a) high heat capaci…
A. High heat capacity
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what kind of bond holds together a water (h2o) molecule? o a) polar cov…
A) Polar covalent bond
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what is adhesion? a) when water molecules stick to other things. b) whe…
A) When water molecules stick to other things.
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what is a hydrogen bond? a) the bond that forms a water molecule. b) wh…
B) When a positive hydrogen atom bonds with a negative atom of another molecule.
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what is a hydrogen bond? a) the bond that forms a water molecule. b) wh…
B) When a positive hydrogen atom bonds with a negative atom of another molecule.
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select the three adjectives. dont select any articles (a, an, or the). …
heavy, bright, clean
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mark each change below p if it is physical and c if it is chemical. __c…
C ### 16. ice melting
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section: what is chemistry? complete each statement below by underlinin…
1. A chemical is any substance that has $\underline{\text{definite}}$ composition. Changes in chemicals, or chemical reactions, take place $\underline{\text{all around us}}$. ### …