化学
化学反応、化学量論、分子構造、元素の性質。
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having problems staying logged in or are you experiencing issues? pleas…
\(\boldsymbol{\ce{^8_4Be}}\)
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what do these two changes have in common? bleaching clothes beating an …
Only the option "Both conserve mass" is correct. So the correct choice is: Both conserve mass.
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water is used to help cool off industrial machinery... adhesion univers…
D. specific heat
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an isotope of phosphorus contains 19 neutrons. construct the symbol for…
\( \ce{^{34}_{15}P} \)
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what do these two changes have in common? cooking a pancake burning a c…
B. Both are chemical changes, C. Both are caused by heating
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an isotope of phosphorus contains 19 neutrons. construct the symbol for…
\(\boldsymbol{\ce{^{34}_{15}P}}\)
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having problems staying logged in or are you experiencing issues? pleas…
\(\boldsymbol{\ce{^{34}_{15}P}}\)
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having problems staying logged in or are you experiencing issues? pleas…
The isotope symbol is $\boldsymbol{^{121}_{51}\text{Sb}}$ (top number: 121, bottom number: 51, element symbol: Sb).
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having problems staying logged in or are you experiencing issues? pleas…
$^{37}_{19}\text{K}$
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having problems staying logged in or are you experiencing issues? pleas…
$\boldsymbol{^{18}_8\text{O}}$
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an isotope contains 8 protons and 10 neutrons. construct the symbol for…
\(\ce{^{18}_{8}O}\)
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having problems staying logged in or are you experiencing issues? pleas…
$\boldsymbol{^{19}_9\text{F}}$
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an isotope contains 9 protons and 10 neutrons. construct the symbol for…
\( \ce{^{19}_{9}F} \)
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water is a universal solvent because it... floats when frozen freezes w…
dissolves most substances (the option in the cyan - colored box)
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an isotope contains 22 protons and has a mass number of 48. construct t…
$^{48}_{22}\text{Ti}$
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having problems staying logged in or are you experiencing issues? pleas…
$^{129}_{53}\text{I}$
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slightly negative end (a) slightly positive ends molecule in which oppo…
D. polar molecule (assuming the options are labeled A to D with A: solution, B: hydrogen bond, C: cohesion, D: polar molecule)
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what do you call any substance that dissolves another substance? image:…
B. Solvent (assuming the purple option is labeled as B, but based on the content, the correct choice is the option with "Solvent")
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when a molecule is negatively charged at one end and positively charged…
B. polarity
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insert dashes where needed. at sunfest organic farm—a cutting-edge herb…
At Sunfest Organic Farm—a cutting - edge herb farm in Okeechobee, Florida—the herbs are washed with ultraviolet light in a vacuum - sealed room.
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conceptual checkpoint 2.2 a 10.0 ml graduated cylinder has marks every …
2.94 mL
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the chemical formula of water is... (with an image of a water molecule …
A. \(H_2O\)
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3. dibuje las formas cis/trans o z/e, según corresponde y escriba el no…
### Parte a) \( \boldsymbol{\ce{CH3CH2CH=CHCH3}} \) (2 - Penteno) #### Explicación de Cis (Z) - **Paso 1: Identificar grupos en dobles enlace** En \( \ce{C2=C3} \) (del enlace \( …
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multiple choice question given the right conditions, ______ carbonate i…
A. calcium
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multiple choice question depending on the chemical composition of the t…
A. ooze
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hot spot 1 point click on the carboxyl group.
The carboxyl group is the part of the structure consisting of the carbon atom (the right - most \(\text{C}\)) double - bonded to an oxygen (\(\text{O}\)) and single - bonded to a …
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what two elements make up water? 1. oxygen and carbon 2. helium and oxy…
4. hydrogen and oxygen
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a pharmacy technician should recognize that which of the following cont…
D. Safety Data Sheet
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extensive: changes when you have more/ less of a substance intensive: s…
Intensive; Because it stays the same regardless of the amount of the substance. But since the original text just has a table and no specific question, if the question was to, say,…
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6 formula 1 punto a student collects co₂ gas in a gas collection tube. …
$0.04$ ### Question 7
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hot spot 1 point click on the amine group.
The amine group is the $\boldsymbol{\ce{H3N+}}$ (or the group containing the nitrogen atom bonded to the central carbon, with three hydrogens attached in this protonated form) par…
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defined as: used in technical drawing, math & geometry, engineering, ca…
C. Ruler ### Second Question:
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click to fix any capitalization errors below. click \submit answer\ if …
Whenever Miguel Rivera's chemistry teacher sat in the dunking booth at the school's Spring Fling, ticket sales were huge.
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defined as: the quality of being logically or factually sound; soundnes…
D. Validity ### Second Question
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1.3 chemical problem solving what is the density of a gold coin if it h…
25 g/cm³ (The option is: 25 g/cm³)
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question 8 (1 point) listen during a chemical reaction, atoms are _____…
C) rearranged
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question 7 (1 point) listen which of the following accurately describes…
C) The pH scale runs from 0 (most acidic) to 14 (most basic), with 7 as a neutral.
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ques sep 8/25 1. how does j.j. thomson’s atomic model differ from the m…
J.J. Thomson’s atomic model (plum pudding) has a uniform positive charge with embedded electrons (no nucleus or energy levels), while Bohr’s model has a nucleus and electrons in q…
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question 6 (1 point) listen something with a ph of 5 would be ______. a…
A) acidic
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reactivity series use your knowledge of reactions to complete the table…
To complete the "Reactivity Series" table, we analyze each metal's reactions based on the reactivity series (most reactive to least: Potassium > Sodium > Calcium > Magnesium > Zin…
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review: 1. look at the following 2 equations. label and highlight the r…
### Question 1: Label Reactants and Products in Chemical Equations #### Part (a): $\boldsymbol{\ce{Na + Cl -> NaCl}}$ - **Reactants**: Substances on the left of the arrow ($ ighta…
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question 3 (1 point) listen the 2+ in cu²⁺ tells us that this atom ____…
A) has two more protons than electrons
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question 4 (1 point) listen why is one side of a single water molecule …
D. Electron pairs are unevenly shared between the oxygen atom and the two hydrogen atoms.
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while the maximum number of electrons required to fill the outermost sh…
A) 8
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question 2 (1 point) listen which of the following bonds is the weakest…
C) The hydrogen bond
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two water molecules are weakly drawn to one another, the slight positiv…
D. hydrogen
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1.3 chemical problem solving the mass of a graduated cylinder containin…
2.3 g/mL (Option: 2.3 g/mL)
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conservation of mass 12 if 37 grams of n₂ react with 73 grams of h₂, ho…
110
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1.2 measurements in chemistry perform the following arithmetic and roun…
\(0.0029\)
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1.2 measurements in chemistry perform the following arithmetic and roun…
0.0029
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______ in particular is extremely dangerous, as it is odorless and colo…
b. Carbon monoxide
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it is important to study the ______ of a material to identify the physi…
c. Reactivity
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your stomach has a ph of 2, and you drink a beverage with a ph of 12 wh…
A. pH will go up (closer to 14)
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1.2 measurements in chemistry the length of an iron bar was measured se…
3.4, 3.5, 3.3, 3.6, 3.5, 3.4 ft
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refresh: complete the below statements using the following words: trans…
To solve this fill - in - the - blank problem related to the law of conservation of mass, we analyze each blank: ### Step 1: First blank (law name) The law that deals with the mas…
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the sticky explosion molasses is a dark, sweet, sticky substance that m…
a. a website of a company currently producing molasses ### Question 2
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quiz content question 1 a floor cleaner was found to have a ph of 13, w…
B. basic
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the graph shows the volume of a sample of gas as a function of temperat…
300 mL
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creating a business pitch explain how your product or service is unique…
For a sustainable skincare line: My product uses 100% organic, locally - sourced ingredients (unlike competitors with synthetic components) and comes in biodegradable packaging, r…
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particles called neutrons. the second, much larger, region of the atom …
Un átomo es la partícula más pequeña de una sustancia que conserva sus propiedades químicas. Un elemento es una sustancia pura compuesta por átomos con el mismo número de protones…
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15. the ionization energies for an element from period 3 are listed bel…
Magnesium (Mg)
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1. what is it called when a gas turns into a liquid? a. melting b. free…
d. Condensation
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silicon, the second most common element in earths crust, is commonly us…
### Part 1: Analyzing the reaction \( \boldsymbol{SiO_2 + 2C ightarrow Si + 2CO} \) #### 1. Reactants and Products - **Reactants**: Substances on the left of the arrow. So \( SiO_…
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silicon, the second most common element in earths crust, is commonly us…
### Part 1: Analyzing the reaction $\boldsymbol{SiO_2 + 2C ightarrow Si + 2CO}$ #### 1. Reactants and Products - **Reactants** (left of $ ightarrow$): $SiO_2$ (silicon dioxide) an…
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10. what element is both a liquid and a metal at room temperature? a. i…
d. Mercury
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7. what are the conditions used to determine the standard state of an e…
c. 25 degrees C ### Question 8
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7. what are the conditions used to determine the standard state of an e…
c. 25 degrees C
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6. what is it called when liquid becomes a gas only at the surface of t…
e. Evaporation
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5. what temperature is the boiling point for water? a. 100 degrees c b.…
a. 100 degrees C
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in which of these scenarios is there no opportunity cost? its friday ni…
All of these scenarios have an opportunity cost.
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9. naturally occurring europium (eu) consists of two isotopes with a ma…
s: - **Europium Atomic Mass**: \(\approx 152.04\) (or more precisely \(152.04\) when rounded appropriately) - **Strontium Atomic Mass**: \(87.712\) (or \(87.71\) when rounded to t…
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explain in your own words why electronegativity increases as atomic num…
(Note: There is a mistake in the question's premise as electronegativity generally **decreases** from top to bottom in a group of the periodic table. But to address the question a…
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multiple-choice question homogeneous mixtures are ______. made of diffe…
D. uniform (assuming the options are labeled A - D as: A. made of different layers, B. made of the same element, C. chemically combined, D. uniform)
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which of the following is a type of heterogeneous mixture? salt + water…
oil + water ($\ce{H_2O}$) (the checkbox next to "oil + water ($\ce{H_2O}$)" should be selected)
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how many atoms are there? input box check
5
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how many molecules are there? a. ? 1 b. ? 2 c. ? 3 d. ? 4 e. ? 5 f. ? 6
B. 2
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how many molecules are there?
2
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what is another term that can be used for a mixture of salt and water? …
Solution (the option corresponding to "Solution" should be selected, e.g., if the "Solution" option has a checkbox, that checkbox should be marked)
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how many molecules are there?
2
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explain in your own words why ionization energy decreases as atomic num…
Ionization energy decreases from top to bottom in the periodic table because as atomic number increases, electron shells are added, moving outer electrons farther from the nucleus…
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how many atoms are there? 1 check
5
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mixtures can be defined as two or more elements chemically combined tog…
The correct option is the one with the statement: "two or more physically combined pure substances." (Assuming the checkboxes are for selection, the box next to this statement sho…
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how many compounds are there?
1
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multiple-choice question what is another example of a pure substance th…
\( \ce{C6H12O6} \), sugar
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how many atoms are there? check
5
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how many elements are there? check
3
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how many elements are there? chemical structure with mg, cl, cl, o, c
4
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how many elements are there? check
3
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how many compounds are there?
1
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how many elements are there? check
3
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compounds are considered pure substances, but are made of only one type…
The correct option is the one with the statement "at least two types of elements bonded together" (the third option, though the identifier for the checkbox isn't labeled, but base…
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10. what is the study of the composition, structure, and properties of …
A. chemistry
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9. which branch of chemistry is the study of non-organic substances, ma…
B. Inorganic chemistry
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8. which substance shown below is not a chemical? (1 point) sucrose wat…
D. trail mix
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7. anything that has mass and takes up space is called ______. (1 point…
A. matter
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6. which branch of chemistry involves the study of the properties and c…
B. physical chemistry
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explain in your own words why ionization energy increases as atomic num…
Ionization energy increases across a period (with increasing atomic number) because nuclear charge increases (more protons), electrons add to the same energy level (so shielding d…
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5. using mathematics and computers to understand a chemical principle i…
D. theoretical chemistry
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4. what is a measure of the amount of matter? (1 point) ○ matter ○ mass…
B. mass
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3. what is a substance that has a definite composition? (1 point) volum…
C. chemical