Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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answer these questions: how can you tell if a material is pure or a mix…
Check if it has a fixed composition and distinct properties. Elements consist of one type of atom; compounds have two or more chemically bonded. Compounds have fixed composition; …
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naturalis historiae (natural history) was written by the ancient roman …
True ### Question 8: "Most medical remedies in ancient times came from chemicals in rocks and minerals, rather than from plants."
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read this prompt. create a multimedia presentation about the risk to fa…
○ a chart showing how commonly used chemicals negatively affect farmers' health
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integrating multiple sources of information determine which multimedia …
an explanation of agricultural water demands → a video of a farmer harvesting crops an interpretation of decreasing rainfall → a line graph a set of statistics about water polluti…
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read the excerpt from a speech on the benefits of eating organic versus…
B. "chemicals", C. "disease", D. "obesity"
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9) do sodium and chlorine form an ionic bond or a covalent bond? a) are…
Sodium y chlorine son diferentes en sus electronegatividades. #### b)
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8) are these compounds ionic or covalent? compound | metal + nonmetal o…
### Problem 8: Correcting the Table (Ionic/Covalent Bonds) #### Step 1: Analyze \( \text{FeCl}_2 \) - **Type of Atoms**: Iron (Fe) is a metal, Chlorine (Cl) is a nonmetal. - **Bon…
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prior to answering the questions, please watch how to take measurements…
True
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read the excerpt from act 1, scene 3, of julius caesar. cassius. and wh…
B. Cassius portrays Caesar as a cruel - hearted tyrant, and at the same time says he pities Caesar because Caesar can't help himself. (Wait, no, re - checking: The correct option …
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use the periodic table in the tools bar to answer the following questio…
\(2970^\circ\text{C}\) (corresponding to the option with \(2970^\circ\text{C}\))
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what rule/principle states that electrons in the same sublevel (p, d, o…
B. Hund's rule
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what rule/principle states that electrons fill orbitals from lowest ene…
A. Aufbau principle
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the numbers in the electron configurations shown below. na: $1s^2 2s^c …
\(C = 2\), \(D = 6\), \(E = 1\)
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use the periodic to fill in the numbers in the electron configurations …
\(A=\boxed{2}\) \(B=\boxed{1}\)
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use the periodic table to identify the element indicated by each electr…
s: 1. \(1s^2 2s^2 2p^6\): \(\boldsymbol{Ne}\) 2. \(1s^2 2s^2 2p^6 3s^2 3p^3\): \(\boldsymbol{P}\) 3. \(1s^2 2s^2 2p^6 3s^2 3p^6 4s^1\): \(\boldsymbol{K}\) 4. \(1s^2 2s^2 2p^6 3s^2…
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which diagram shows the correct electron configuration for fluorine (f)?
The first option (with \(1s\) \(\uparrow\downarrow\), \(2s\) \(\uparrow\downarrow\), and \(2p\) with two \(\uparrow\downarrow\) and one \(\uparrow\) electrons)
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use the periodic table to answer the questions below. which diagram sho…
The second option (the one with \(1s\) and \(2s\) orbitals filled with \(\uparrow\downarrow\) and \(2p\) orbitals with three \(\uparrow\) electrons)
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type in the maximum number of electrons that can be present in each she…
\( n = 5 \) shell: \( 50 \) \( n = 2 \) shell: \( 8 \) \( n = 2, l = 0 \) subshell: \( 2 \) \( n = 2, l = 1 \) subshell: \( 6 \) \( 3d \) subshell: \( 10 \) \( 2s \) subshell: \( …
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use the dot structure on the right and the periodic table to determine …
B. potassium (K)
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dic table to answer the questions: $1s^22s^22p^63s^23p^64s^23d^{10}4p^5…
B. bromine (Br)
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use the electron configurations and the periodic table to answer the qu…
nitrogen (N)
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which of the following is the correct electron configuration for titani…
A. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{2}\)
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use the periodic table to answer the questions: which is the correct el…
B. \(1s^{2}2s^{2}2p^{6}3s^{1}\) (where B is the option corresponding to \(1s^{2}2s^{2}2p^{6}3s^{1}\))
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air pollution essay persuasive essay outline introduction thesis statem…
The correct option for the topic sentence of Body Paragraph 2 is: "Secondly, air pollution can cause heart disease after exposure to long - periods of time." (the third option amo…
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hydrogen is an invisible gas. one of its famous partnerships is with ox…
A. Oxygen
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hydrogen energy is energy that comes from hydrogens. we harness hydroge…
A. Water
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₁h + ⁸o --> h2o & energy combining hydrogen with oxygen results in the …
yes
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choose the correct answer is pure hydrogen easily found on earth or is …
A. hydrogen is usually found combined with other elements
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choose the correct answer. this model of a hydrogen atom shows how hydr…
yes
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when hydrogen burns, it reacts with oxygen in the air. what product is …
A. water ($\ce{H_2O}$)
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choose the correct answer hydrogen is the lightest of all elements. whi…
Hydrogen is an odorless, colorless, gas.
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what is the best definition of biomass energy? energy from plants and o…
A. Energy from plants and other organic material
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biomass energy is energy from plants and other organic matter, such as …
C. Wind
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choose the correct answer when methane is burned, is energy released? n…
yes
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how many subshells are in the n = 4 shell? 4 ✔️ complete how many orbit…
32
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how many subshells are in the $n = 4$ shell? 4 ✔️ complete how many orb…
16
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question 10 of 10 what character would be the best example of an archet…
B. A stubborn police officer who seeks justice
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how many subshells are in the n = 4 shell?
4
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name: teacher: schools q2 chemistry: u4l10 covalent lewis dot diagrams …
### 1. $\boldsymbol{CF_4}$ #### Lewis Dot Diagram: - Carbon (C) is central, has 4 valence electrons. - Four Fluorine (F) atoms, each with 7 valence electrons. - C forms 4 single b…
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water has a higher heat capacity than oil. what does that mean? water c…
A. Water can hold more heat than oil before increasing in temperature ### Second Question (Coastal areas have milder climates because)
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various true & false and multiple choice questions on thermal energy an…
True ### Question 2 (Water and sand heating - heat capacity)
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could ice is more dense than liquid water? true false why is ice less d…
False ### Second Question: "Why is ice less dense than water?" (Multiple Choice)
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what is the best explanation for why the stream of water was attracted …
The uneven distribution of the electrons in the water molecule are attracted to the charged balloon ### Second Question:
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iodine crystals do not dissolve in water. this is because - iodine crys…
C. iodine crystals are non - polar and water is polar (assuming the options are labeled A, B, C, D in order) ### Second Question (Water forming a curved shape on a penny)
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how was the shape of the grand canyon formed? - tectonic plates moving …
The Colorado River carved the canyon ### Second Question (How did the Grand Canyon get so wide?):
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on june 6, 1944, the allies executed the largest ______ assault ever at…
B. amphibious
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2. in the reaction of solid copper with silver nitrate, solid silver an…
The mass of solid silver formed is approximately $\boldsymbol{83.45\space g}$
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2 a student conducts an investigation in which they heat water on a hot…
A. Thermal energy transfers from warmer molecules to cooler ones in the water via convection.
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1 how does the motion of molecules in solids relate to thermal energy t…
D. Molecules involved in conduction vibrate in place due to high amounts of thermal energy, transferring it to less active molecules nearby
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stoichiometry-practice questions 1. when calcium carbonate reacts with …
Balanced equation: $\boldsymbol{\ce{CaCO3 + 2HCl -> CaCl2 + H2O + CO2}}$ ### Part b:
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practice problems: 5. hydrazine, n₂h₄, reacts exothermically with hydro…
### Problem 5a: Limiting Reactant Determination (Hydrazine and Hydrogen Peroxide) # Explanation: ## Step 1: Calculate moles of \( N_2O_4 \) and \( H_2O_2 \) Molar mass of \( N_2O_…
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which element has an ion that is smaller than an ion of calcium? ○ pota…
D. magnesium
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what is the predicted order of first ionization energies from highest t…
The correct order of first ionization energies from highest to lowest for Li, Na, K, and Rb is given by the option with "Li > Na > K > Rb" (the third option, assuming the options …
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analyze a chemical reaction 6. the equation that represents the chemica…
Reactants: \( \text{CH}_4 \) (methane) and \( \text{O}_2 \) (oxygen, 2 molecules). Products: \( \text{CO}_2 \) (carbon dioxide) and \( \text{H}_2\text{O} \) (water, 2 molecules). …
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which best describes the trends in electronegativity on the periodic ta…
Electronegativity increases up and to the right.
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the mass number of a chromium atom is 52 and it has 24 protons. how man…
28
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which is most likely true about electronegativity? ○ it tends to be the…
It tends to increase across a period.
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chuck wants to know how many electrons in an atom are not paired up. wh…
a dot structure of the atom
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how many electrons can the n = 4 shell hold? ○ 8 ○ 16 ○ 32 ○ 64
32 (corresponding to the option "32")
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which of these properties is the best one to use for identification of …
B. the number of protons in the atomic nucleus
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analyze a chemical reaction 6. the equation that represents the chemica…
- Reactants: $\ce{CH_{4}}$ (methane) and $\ce{O_{2}}$ (oxygen) molecules. - Products: $\ce{CO_{2}}$ (carbon dioxide) and $\ce{H_{2}O}$ (water) molecules.
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analyze a chemical reaction 6. the equation that represents the chemica…
- Reactants (molecules): Methane ($\ce{CH_{4}}$) and oxygen ($\ce{O_{2}}$) - Products (molecules): Carbon dioxide ($\ce{CO_{2}}$) and water ($\ce{H_{2}O}$) ### Question 7
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find aluminum in the periodic table. what is aluminums period and group…
C. Period 3, Group 3 (13) (assuming the third option is labeled as C; if the original options have different labels, adjust the label but keep the text "Period 3, Group 3 (13)").
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by looking at the bohr models for the elements on the screen, you can d…
A. 5 (assuming the Bohr models show elements with 5 valence electrons, characteristic of group 5 in the periodic table)
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the group number tells you how many valence electrons are in the _____.…
outer shell/ valence shell
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select the word that means a horrible odor. the durian fruit of asia is…
stench
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multiple-choice question you read group from_. left to right bottom to …
D. Right to Left (assuming the options are labeled A - D as A. Left to Right, B. Bottom to Top, C. Top to Bottom, D. Right to Left)
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multiple-choice question the period number tells the number of _______ …
D. electron shells
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multiple-choice question periods are the ______ rows in the periodic ta…
B. horizontal (assuming the options are labeled, but since the original has checkboxes, the correct choice is the "horizontal" option, so the answer is the option with "horizontal…
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the reactant that is completely used up in a chemical reaction is calle…
The limiting reactant is \( \boldsymbol{H_2O} \) (water).
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which of the following is not an example of a precautionary statement o…
D. Signal words
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which would be classified by osha as a health hazard? a an explosive ch…
C. A cancer - causing chemical
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practice problems 1. nitrogen can combine with oxygen to form several d…
\(4.675\times 10^{-2}\) mol ### Problem 1b:
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practice problems sample problem 1: determine the number of moles of ox…
The number of moles of oxygen needed is \(0.7\space mol\).
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \(2 F_2(g) + O_2(g) ightarrow 2 OF_2(g)\)
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the word \biotic\ means organic. use this definition to complete the fo…
1. Something that is $\boldsymbol{\text{antibiotic}}$ will destroy organic matter. 2. Something that encourages organic matter to grow is $\boldsymbol{\text{probiotic}}$. 3. Somet…
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what is a characteristic of straight chained alkanes? they have one or …
They have carbons bonded in a single row from one end of the molecule to the other end of the molecule.
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how would a makeup artist use face charts in the entertainment industry…
A makeup artist in the entertainment industry uses face charts to plan, visualize, and document makeup designs for characters. They sketch color schemes, contouring, and overall l…
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read the same passage and think about the evidence that kinetic energy,…
Ellen used her muscles to move faster, and the effort made her hot.
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choose the best answers. 1.8) ______ what happens when forces cause obj…
A. Energy is transferred from the force to the object. ### 1.9)
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complete the sentence with the pronoun that agrees with the word or wor…
her
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recognizing rhyme scheme use the rhyme scheme of a shakespearean sonnet…
The correct option is the one with the lines "For at a frown they in their glory die, / Unlook'd for joy in that I honour most" (the second un - crossed option, or the one where t…
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complete the sentence with the pronoun that agrees with the word or wor…
they
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7) choose the correct answer. the two processes that form metamorphic r…
B. contact metamorphism; regional metamorphism ### Question 8
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question 4. a chemistry student is analyzing the behavior of nonmetals …
C. Yes, because hydrogen and chlorine form a covalent bond by sharing electrons.
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exit ticket 17 (module 7 - lesson 1) question 3. which of the following…
- Covalent bonds involve the sharing of electrons. - Covalent bonds can form single, double, or triple bonds.
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question 2. in a molecule of water (h₂o), each hydrogen atom forms a si…
octet (or duet, but octet is the standard rule referenced here for electron shell filling in covalent bonding, with hydrogen following a duet variation under the broader octet rul…
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question 1. drag the correct terms to complete the description of coval…
First blank: share Second blank: nonmetal Third blank: valence
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identifying compound-complex sentences which sentences are compound-com…
C. We can put together a puzzle that has challenging shapes, or we can try to solve the sudoku in the newspaper. E. Students can improve their performance when they are faced with…
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annotation requires the following 1. number paragraphs 2. write a summa…
1. Number paragraphs: 1, 2, 3, 4, 5 2. Summary sentences: - Para 1: Chemical bonds hold elements in compounds; they’re forces of attraction between atoms via electron transfer/sha…
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \(2 F_2(g) + O_2(g) ightarrow 2 OF_2(g)\)
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \(2 F_2(g) + O_2(g) ightarrow 2 OF_2(g)\)
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read the passage, then answer the question that follows. no one could h…
B. It shows that technology had a role in changing how we sweeten our foods.
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which of the following is an example of an herbicide? - gelatin - penic…
D. glyphosate
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which of these is most closely related to traditional agriculture and n…
the use of human or animal muscle power
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an atomic nucleus has a negative charge. true
The statement is False. (If the options were to choose between True/False, the correct answer is False. Since the given option shows "True" but the correct answer is that the stat…
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2na → na⁺ + e⁻ is a reducing agent equation, and it depicts the oxidati…
sodium (the option with text "sodium")
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half - reactions are useful tools in balancing equations. true false
True
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oxidation can only be written as a reaction. true false
False
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comprehension check fill out the chart with details about \if\ and \the…
To solve this, we analyze the poem "If" by Rudyard Kipling: ### Number of Lines The poem "If" has 32 lines (organized into 4 stanzas of 8 lines each). ### Number of Stanzas It has…