Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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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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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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drugs modify the brain chemistry and change behaviors. please select th…
T
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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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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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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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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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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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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…
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oxidation number indicates the charge of an atom alone or in a molecule…
True
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what happens with the referenced oxidation number when the element with…
A. decrease
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the oxidation number for the element fluorine when it is in a compound …
-1 (the option with -1, e.g., if the first option is labeled as A, then A. -1)
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in most compounds, the oxidation number of oxygen is ______. -1 -2
-2 (the option corresponding to -2, which would be the second option in the given choices: the option with -2)
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listen and learn comprehension check fill out the chart with details ab…
To fill out the chart for the poems "If" (by Rudyard Kipling) and "The Rhodora" (by Ralph Waldo Emerson), we analyze their structural and literary elements: ### 1. **Number of Lin…
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short answer - choose 3 to answer 1. briefly discuss some of the effect…
Effects of overgrazing on rangeland include vegetation degradation (increased soil erosion, reduced plant cover), soil quality decline (lower organic matter, poor structure), and …
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what is the overall charge on the nucleus of a fluorine atom? -1 +9 -9 …
B. +9
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strontium and barium have similar chemical properties because atoms of …
B. valence electrons
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how many days are required for 200. grams of radon-222 to decay to 50.0…
7.64 days
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k-12 conservation of mass in chemical reactions 9/10 you have 2 questio…
TRUE
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write the name of each of the following compounds: nh₄cl li₂s al₂o₃ snc…
### Part 1: Naming Compounds #### 1. $\ce{NH4Cl}$ ## Step1: Identify cation and anion. Cation: $\ce{NH4+}$ (ammonium), Anion: $\ce{Cl-}$ (chloride). ## Step2: Combine names. Name:…
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-12 conservation of mass in chemical reactions 8/10 you have 3 question…
FALSE
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a chemical occurs when some substances change chemically to other subst…
reaction
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chemical reactions are represented by chemical formulas. true false che…
FALSE
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which chemical reaction is correctly balanced? a \\( ch_4 + 2o_2 \ ight…
a. \(CH_4 + 2O_2 ightarrow CO_2 + 2H_2O\)
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which equation shows that mass is conserved in the chemical reaction? a…
c. \(4Al + 3O_2 ightarrow 2Al_2O_3\)
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which equation shows that mass is conserved in the chemical reaction? a…
d. \(N_2 + 3H_2 ightarrow 2NH_3\)
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which statement is true about the following reaction equation? $\\ce{n_…
d. The reaction is balanced with the same number of each element on both sides, so it obeys the law of conservation of mass.
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lavoisier was careful to use a sealed jar in order to best confirm cons…
mass
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which word best completes the following sentence: antoine laurent lavoi…
b. mass
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unit 9: mixed ionic compounds directions: answer each question complete…
- Cation: \( \text{Ba}^{2+} \) - Anion: \( \text{SO}_3^{2-} \) - Formula: \( \text{BaSO}_3 \) ### Part b: Lead(IV) Phosphate