Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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question: whats the term used for water molecules bonding with elements…
B. Hydration
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complete the following table: | name | symbol | atomic number | mass nu…
To complete the table, we use the following relationships: - Atomic number (\(Z\)) = Number of protons = Number of electrons (in neutral atoms). - Mass number (\(A\)) = Atomic num…
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fill in the blank question caffeine is a and a natural component of the…
stimulant (or alkaloid, but stimulant is more context - appropriate for the effect - related description here)
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write the relationship below using function notation (that is, y is a f…
\( m = f(v) \)
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c. how many protons are there in any cl atom? ____ d. how many protons …
17 ### Sub - question d:
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c. how many protons are there in any cl atom? ____ d. how many protons …
17 ### Sub - question d: How many protons are there in any Te atom?
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which best describes the structure of the poem \safari day in kenya\? ○…
D. free verse with varied line lengths (assuming the options are labeled A - D as per typical multiple - choice, with the last option being D)
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questions: a. what is the atomic number of chlorine (cl)? ______ b. wha…
a. 17 b. 74
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question 13 of 20 : select the best answer for the question. 6 c carbon…
B. 6
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periodic table review 1. the periodic table has a great deal of informa…
17 ### Part b
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question 10 of 20 : select the best answer for the question. 10. which …
D. Organic solid
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question 9 of 20 : select the best answer for the question. 9. whats er…
D. The removal of weathered products from rock
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9. in addition to the chemical symbol, we can represent atoms by name. …
To complete the table, we use the standard names of elements corresponding to their symbols: | Symbol | Name | |--------|------------| | C | Carbon | | Ca | Calcium | | Fe | Iron …
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8. play with the simulation. which particles affect the mass number of …
Protons and neutrons
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read the poem. skimming the bottom in the company of toes, i observe th…
C. abcb
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check all that apply. what were some innovations in farming techniques …
B. pest control, C. Irrigation, D. crop rotation, F. inorganic fertilizers
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question 30 of 30 what class of organic molecule is shown below? o || h…
A. Aldehyde
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question 29 of 30 what is the name of the molecule below? h₃c−c≡c−ch₃ a…
C. 2-butyne
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question 28 of 30 which type of hydrocarbon has only single carbon-carb…
B. Alkane
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which of the following shows the electron dot structure for a bromine a…
C. $\boldsymbol{:\overset{..}{Br}:}$ (with the correct 7 valence - electron dot arrangement as in option C)
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periodic table choose the correct chemical symbol to complete the sente…
Kr
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what is the maximum number of electrons in the fourth energy level? a. …
A. 32 electrons
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question 27 of 30 what is the formula for the alcohol functional group?…
A. \(-\text{OH}\)
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periodic table what causes the unique atomic spectra produced for each …
B. Atoms emit light as excited electrons drop down to lower energy levels.
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question 26 of 30 what does the prefix cis- in the name of a stereoisom…
A. The groups are on the same side of the double bond.
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periodic table what is the wavelength of a light wave with a frequency …
B. \(1.2\times 10^{-6}\space m\)
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estimate the atomic mass of silicon based on the following information:…
B. 28.1 amu
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question 24 of 30 how many bonds can one carbon atom form with another …
B. Four
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periodic table choose the correct terms to complete the sentences. oxyg…
First "Choose" dropdown: protons Second "Choose" dropdown: neutrons
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question 19 of 30 which functional group is represented in the diagram …
B. Ketone
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question 18 of 30 which functional group does formic acid contain? a. —…
A. \( -\text{COOH} \)
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question 16 of 30 what is hexane? a. a hydrocarbon molecule containing …
D. A hydrocarbon molecule containing six carbon atoms and only single bonds
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question 15 of 30 why can carbon form so many compounds? a. carbon can …
D. Carbon can form single, double, or triple bonds.
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question 12 of 30 what types of bonds and atoms are in the molecule sho…
D. Single bonds, double bonds, carbon atoms, and hydrogen atoms
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multiple-step dimensional analysis practice (introductory chemistry pod…
3600 inches ### Problem 2:
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question 9 of 30 what is the molecule shown below? h ch₃ h h h h h | | …
B. 2,3 - dimethylhexane
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question 8 of 30 which functional group has the general formula —coo—? …
A. Ester
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question 7 of 30 which type of organic compound is shown below? chemica…
A. Alcohol
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question 6 of 30 what type of molecule is shown below? h h h h h h | | …
D. An alkane
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question 5 of 30 which of the following are saturated hydrocarbons? a. …
A. Alkanes only
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question 3 of 30 what is the name of the molecule below? h—c≡c—h a. met…
C. Ethyne
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periodic table place the elements in order from the element with the mo…
Se, Ca, Ar, H
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periodic table order the following atoms from highest to lowest number …
barium, tin, gallium, potassium, aluminum
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question 1 of 30 what is the name of the opposite stereoisomer of the m…
B. trans - 2 - pentene
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periodic table the model shows values corresponding to a mystery elemen…
First dropdown: Atomic Number Second dropdown: 44 Third dropdown: Mass Number Fourth dropdown: 101
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select the bohr model that represents the electron configuration of nic…
B
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if spills of greases or corrosive chemicals occur while you are working…
b. Safety data sheets (SDS)
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protective chemical gloves should extend to ______ to reduce the risk o…
d. The middle of your forearm
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the mystery of phlogiston: a tale of fire, air, and discovery in the 16…
Mass is the amount of matter in an object, a measure of the quantity of substance it contains, related to inertia and quantifying the "amount" of the object (e.g., a log's mass in…
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______ do not provide as much eye protection as safety glasses, but the…
d. Safety goggles
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______ are designed to be worn in cold temperatures, particularly durin…
b. Leather gloves
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heat buildup is a factor to be aware of when wearing: a. leather gloves…
d. Chemical gloves.
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technician a says heavy-duty and impenetrable chemical gloves should al…
c. Both Technician A and Technician B
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multiple choice 1 pt mark the correct answer. 14. which of the followin…
C. Astrology
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multiple choice 1 pt mark the correct answer. 11. what is the primary f…
B. Study of celestial objects and phenomena (assuming the option with "Study of celestial objects and phenomena" is labeled as B; adjust the label as per the actual option numberi…
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question 1 the molecular weight of an atom is the total combined weight…
B. neutron and protons (assuming options are labeled A, B, C as: A. electrons and neutrons, B. neutron and protons, C. protons and electrons) ### Question 2
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a crystal exhibits only three mirror planes, three two - fold rotationa…
Orthorhombic
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16. how many unpaired electrons does mn²⁺ have? (hint: write the e.c.)
5
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now it’s your turn... • materials / everyday products • table salt (nac…
s: - Formula units of NaCl: $\boldsymbol{\approx 1.55 \times 10^{22}}$ (or $1.54 \times 10^{22}$ depending on precision) - Sodium atoms: $\boldsymbol{\approx 1.55 \times 10^{22}}$…
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exercise helps boost ______ , which are chemicals in our brains that ma…
A. endorphins
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1 numerade 1 punto how many significant figures are in 123 ml? respuest…
3 ### Problem 2: Convert 199 pounds to grams
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specific heat capacity is the amount of energy required to raise 1 gram…
.900 Joules (the option with ".900 Joules")
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1. how many drops of each substance did you fit on the head of a penny?
The number of drops varies by substance (e.g., water: ~20–30, soap: ~10–15) and experimental conditions. Record your own results from the experiment.
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practice questions 1. potassium (k), a=39, z=19 → find p, n, e. 2. sulf…
\( p^+ = 19 \), \( n^0 = 20 \), \( e^- = 19 \) ### Question 2: Sulfur (S), \( A = 32 \), \( Z = 16 \)
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calculate the average atomic mass of lithium to the nearest thousandth,…
\(6.945\) amu
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questions 14 and 15 ask about the preceding passage as a whole. 14. the…
H. C in Paragraph 2 ### Question 15
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3.) lead has four naturally occurring isotopes: isotopes of lead: perce…
The average atomic mass of lead is approximately \(207.24\) amu (rounded to two decimal places)
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questions 14 and 15 ask about the preceding passage as a whole. 14. the…
G. coats, we watched ### Question 17
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now it’s your turn... • nutrition / food science • glucose (c₆h₁₂o₆) a …
Approximately $4.01\times10^{22}$ molecules of glucose. ### Second Sub - Question: How many hydrogen atoms are in that candy bar?
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vocabulary matching: match each vocabulary word with the correct clue. …
G. Chemical Equation ### Question 3
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2.) calculate the average atomic mass of bromine. one isotope of bromin…
The average atomic mass of bromine is approximately \( 79.91 \, \text{amu} \) (or more precisely \( 79.906 \, \text{amu} \))
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now its your turn... • environment / air pollution carbon dioxide (co₂)…
(Sub - Question 1): The number of \(CO_2\) molecules released is approximately \(\boldsymbol{1.20\times 10^{24}}\) (or more precisely \(1.204\times 10^{24}\)) molecules.
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1.) calculate the average atomic mass of sulfur if 95.00% of all sulfur…
The average atomic mass of sulfur is approximately 32.06 amu (rounded to two decimal places).
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bypassing the liquid water phase, these molecules condense directly ont…
B. a detail that mentions a step some water molecules skip in changing from vapor to solid ### Question 8
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5. when two clear liquids are mixed and a solid forms, what is this sol…
The solid is called a precipitate. It shows that a chemical reaction (precipitation reaction) has occurred, where an insoluble substance forms from the reaction of two soluble sub…
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lénergie de première ionisation de laluminium est de 578 kj/mol. quelle…
La longueur d'onde de la lumière nécessaire est d'environ \(\boldsymbol{207 \, \text{nm}}\) (ou une valeur proche en fonction des approximations des constantes).
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03 question (3 points) astronomers have detected hydrogen atoms in inte…
\(\boxed{-9.9 \times 10^{-26}\ \text{J}}\)
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safety in your science classroom safety symbols the following safety sy…
To solve this, we analyze each procedure: ### Procedure 1: “Pour liquids at procedure” - **Safety Symbol**: *Glassware Safety* (since pouring liquids involves using glassware, and…
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safety symbols the following safety symbols are used in bc science conn…
To solve this, we analyze each procedure: ### Procedure 1: Use a razor blade to cut open a sea star - **Safety Symbols**: Sharp Object Safety (due to razor blade, risk of cuts) an…
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which of the following is least likely to dissolve in water? nonpolar f…
A. nonpolar fats and oils
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question 23 protons have ____. a no charge b a positive charge c a nega…
B. a positive charge ### Question 24
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4. why is it easier to observe the law of conservation of mass in a clo…
In a closed system, matter cannot enter or leave, so the total mass remains constant and is easy to measure. In an open system, matter (e.g., gases, reactants/products) can escape…
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25/24 hydrogen atoms have this charge... negative positive
B. positive (assuming the options are labeled as A. negative, B. positive; if the labels are different, adjust accordingly, but the correct choice is the one with "positive")
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question 25 if coffee has a ph of 5 and soda a ph of 4, which is more a…
D. Soda is 10 times more acidic than coffee. ### Question 26
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why does ice float? ice is more dense than liquid wate♣ ice is less den…
B. Ice is less dense than liquid water.
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sugar dissolving in coffee (which contains water)... universal solvent …
A. universal solvent
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foldables make a two - tab book to organize your notes about how mechan…
When a rock undergoes mechanical weathering, it is broken down into smaller pieces (such as sediments or rock fragments). The chemical composition of the rock remains unchanged; o…
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study coach identify main ideas work with a partner. read a paragraph t…
Weathering breaks down or changes rock via mechanical (physical) weathering (e.g., frost wedging, exfoliation, abrasion) that physically fragments rock without chemical change, ch…
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the attraction that causes water droplets to stick together and form la…
B. cohesion
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study coach identify main ideas work with a partner. read a paragraph t…
Weathering breaks down or changes rock via mechanical (physical) weathering (e.g., freeze - thaw, root growth, abrasion, breaking rock into smaller pieces without chemical change)…
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1st attempt part 1 (1 point) orbital with the following boundary-surfac…
\(p\) orbital (or \(p_x\) orbital, or \(2p\) orbital etc. depending on context, but the main identification is a \(p\) - type orbital) ### Part 2
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click on the hydroxyl group.
To identify the hydroxyl group ($\ce{-OH}$), we examine the structure: - The group $\ce{HO -}$ (attached to the carbonyl carbon, $\ce{C=O}$) is a hydroxyl group (since $\ce{HO -}$…
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water soaking into a cotton t-shirt when it is raining is an example of…
A. adhesion
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what do these two changes have in common? milk going sour making paper …
Both are chemical changes.
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part 1 (1 point) when writing your answers, do not add spaces and do no…
\([Ar]4s^23d^5\)
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what do these two changes have in common? sauce burning on a stove firi…
A. Both are chemical changes. B. Both conserve mass. D. Both are caused by heating.
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having problems staying logged in or are you experiencing issues? pleas…
\( \boldsymbol{\ce{^6_3Li}} \)
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what do these two changes have in common? dust settling out of the air …
Both are only physical changes.
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what do these two changes have in common? baking a loaf of bread salt a…
A. Both conserve mass, D. Both are chemical changes
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water is made of two oxygen atoms and one hydrogen atom. (with an image…
FALSE