Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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question 4 (10 points) listen what is the structure of 3-methylcyclohep…
The second option (the one with the 7 - membered ring, a double bond, and a $\ce{CH_3}$ group attached to a carbon that is the 3rd carbon in the cycloheptene numbering)
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21 pour préparer 25,0 ml d’une solution à 3,5 × 10⁻² mol/l, vous utilis…
To prepare the solution, measure \( 8.75 \, \text{mL} \) of the \( 0.10 \, \text{mol/L} \) concentrated solution, transfer it to a \( 25.0 \, \text{mL} \) volumetric flask, and di…
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1. ¿cuándo y por qué se deben utilizar gafas de seguridad? 2. ¿qué hace…
Se deben utilizar gafas de seguridad en actividades donde existan riesgos para los ojos, como en laboratorios de ciencia (manipulación de productos químicos, experimentos), trabaj…
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how does temperature affect the state of water? select three correct an…
A. Water is a solid at temperatures lower than the melting point, C. Water is a gas at temperatures higher than the boiling point, D. Water is a liquid at temperatures between the…
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the elements from this section of the periodic table all belong to the …
C. period
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work together to create a rule to help to determine if a change is cons…
### Rule: - **Physical Change**: No new substance formed (changes in state, shape, size, or mixture without reaction). - **Chemical Change**: New substance formed (via reactions, …
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gold, silver, and aluminum are metals and are located to the left of th…
B. Low conductivity - does not allow the flow of electrical current and heat
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breaking glass vs battery generating electricity—watch the animation an…
### Breaking Glass #### What do you notice about the particles? The particles of the glass (molecules/atoms) remain the same in identity; they just change in arrangement (break in…
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breaking glass vs battery generating electricity—watch the animation an…
### Breaking Glass: #### What do you notice about the particles? The particles (molecules of glass) remain the same in identity; they just get separated into smaller pieces (the g…
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chopping wood vs burning wood—watch the animation and look at the befor…
### Chopping Wood: - **What do you notice about the particles?** The particles (wood) are just broken into smaller pieces; their chemical identity remains the same. - **Is this a …
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assuming no determinate errors, within what range are you at 95% confid…
Approximately \( 33.83\% \) ### Part d) For ethanoic acid (\( CH_3COOH \)), \( K_a = 1.8 \times 10^{-5} \), formula for pH of weak acid: \( pH = \frac{1}{2}(pK_a - \log c) \), whe…
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4. mientras lavaba la cristalería, mike le salpicó agua a evon. para ve…
NO ### Question 5
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click on the butter, watch the animation and look at the before and aft…
When butter melts, the particles (molecules) move more freely, their arrangement becomes less ordered (from solid - like close packing to liquid - like more spread - out), and the…
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1) a block of aluminum occupies a volume of 15.0 ml and weighs 40.5 g. …
s: 1. \( \boldsymbol{2.7 \, \text{g/mL}} \) 2. \( \boldsymbol{13.6 \, \text{g/mL}} \) 3. \( \boldsymbol{157.8 \, \text{g}} \) 4. \( \boldsymbol{\approx 8.92 \, \text{g/mL}} \) 5. …
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question one a) clearly distinguish between the following terms as appl…
### Part (a) #### i) End point and equivalence point - **End point**: The point in a titration where a visible change (like color change of an indicator) occurs, signifying that t…
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which of the following elements has 6 electrons in its outer shell? c) …
B) Oxygen
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which elements make up a water molecule? o hydrogen and nitrogen o oxyg…
D. hydrogen and oxygen
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question 19 1 pts chemical substances that change moods and perceptions…
B. psychoactive
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which statements describe molecules? check all that apply. molecules ar…
Molecules are made of two or more atoms. Molecules range in size. Molecules are made of atoms of the same element or different elements.
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graph the following data below. solubility of compound (g solute/100g w…
Solubility of KCl at 40°C is approximately 40 g solute/100g water. Solubility of KClO₃ at 80°C is approximately 42.5 g solute/100g water.
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arrange these stages of moisture retention in the correct order, from w…
Question 1: 2, 4, 3, 1 Question 11: b. Darker soil color Question 12: b. Adding compost or manure
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question 7 (1 point) what does organic matter do to soil structure? a i…
Question 7: A. Improves structure by making more pores Question 8: B. It absorbs and stores water in soil Question 9: B. It has little organic matter and large pores
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why is moisture retention important for soil? o a it holds water for pl…
a. It holds water for plants to use over time b. Plastic a. Pure clay
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question 4 (1 point) why is moisture retention important for soil? a it…
Question 4: C. It holds water for plants to use over time Question 5: A. Plastic Question 6: D. Pure clay
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concept check what is the mass of a 0.75 in³ cube of gold? hint: densit…
$237.694363\ g$
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ischemia would best be described as multiple choice disease of the hear…
D. lack of blood supply to tissue
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the correct pronunciation for ischemic is: multiple choice isk- key-mic…
B. ish - KEY- mic.
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how do prepositional phrases function? read the sentences on the right.…
1. "with his chemistry grade": adverbial phrase modifying an adjective 2. "at the spring carnival": adverbial phrase modifying a verb 3. "behind the firehouse": adjectival phrase …
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click on the butter, watch the animation and look at the before and aft…
Particles' relative positions change. It's a physical change. Evidence: No new substances are formed; only the shape and size of butter pieces change.
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click on the filtered water, watch the animation and look at the before…
This is a physical change because only the appearance changes as particles are removed, not the water's chemical nature.
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1. what is the density of carbon dioxide gas if 0.196 g occupies a volu…
$0.00196\ g/mL$
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silver has two naturally occurring isotopes, ag - 107 (106.905 amu) and…
The percent abundance of Ag - 107 is $51.7\%$ and the percent abundance of Ag - 109 is $48.3\%$.
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question 10 1 pts the figure below shows an atomic bond forming between…
all of the above
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multiple choice question how do lipids differ from other organic compou…
They are insoluble in water
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multiple choice question what class of organic compounds has the chemic…
Carbohydrates
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fill in the blank question a carbohydrate contains atoms of , carbon, a…
oxygen
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still feels unmotivated when learning chemistry and geography and asks …
A. Trello
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multiple choice question molecules with the chemical formula c6h12o6 ar…
D. carbohydrates
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like you, chloe is juggling her time between learning, hobbies, and oth…
B. Notion
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fill in the blank question. the term is the chemical term for a single …
Monosaccharide
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multiple choice question organic compounds, by definition containing bo…
B. hydrogen
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multiple choice the ph scale measures: o the potential of a system to r…
the concentration of hydrogen ions in solution
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question 3 of 3 3 what is one way dry ice is different from regular ice…
A. Dry ice forms at a colder temperature than regular ice
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fill in the blank question by definition, the molecules or atoms that a…
products
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misty magic use the ai reading tool to make sense of tricky words and s…
Dry ice is a result of the sublimation process
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multiple choice question the molecular formula provides information abo…
types of atoms in a molecule
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misty magic use the ai reading tool to make sense of tricky words and s…
B. When dry ice turns into gas
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multiple choice question what is the most abundant compound in the huma…
Water (H₂O)
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two or more atoms that bond together form a(n) _______. o element o mol…
B. molecule
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fill in the blank question. if a compound contains carbon and hydrogen …
organic
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fill in the blank question a value called measures the hydrogen ion con…
pH
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multiple choice question the components of substances that are ______ s…
B. ionically bound
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multiple choice question what is the term for the molecules or atoms th…
C. Products
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6 which quote explains why solids dont take the shape of their containe…
B. "The particles don't move around so much, and they get locked into a rigid structure."
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5 classify each of the following as describing the molecules in a solid…
Solid: vibrating slowly, close together Gas: spread out, moving quickly
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2 what could cause a liquid to become a gas? a raising the liquids temp…
A. Raising the liquid's temperature
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7. how to you maintain your blood ph? 8. an acid is any solution that h…
7. Through buffer systems, respiratory and urinary systems. 8. Hydrogen ions ($H^+$) 9. Hydroxide ions ($OH^-$) 10. Acidic
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select the correct answer from each drop - down menu. read this sonnet,…
metaphor
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clue this element is directly above the element with 13 protons the ato…
The clues describe multiple elements. If we consider each clue separately: Boron, Phosphorus, Magnesium, Gallium, Aluminum, Chlorine, Strontium, Arsenic, Tin.
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the atomic number of this element is 49. this element has 2 fewer elect…
1. In 2. As 3. Sn 4. Te 5. Og 6. Sb 7. (No match in options for C) 8. Pb 9. Tl 10. P 11. At 12. Bi 13. Fl 14. Po
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clue,element this element is an alkali metal with 55 protons.,cs this e…
The elements corresponding to the clues are: Cs, Rn, In, As, Sn, Te, Og, Sb, C (not Cs as in table), Pb, Tl, P, At, Bi
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tennessine (ts). this element is directly below the element whose atomi…
The elements corresponding to the statements from top - to - bottom are: Si, Al, Pb, N, Ba, B, Ne, Xe, Ar, Kr, Ga, Ge, Se, S
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this element has one more proton than caesium (cs). this element has 5 …
10: B 11: Ne 12: Xe 13: Ar 14: Kr 15: Ga 16: Ge
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this element has 116 electrons. this element has one more proton than l…
1. Lv 2. Be 3. Mc 4. Si 5. Al 6. Pb 7. N
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this element has 116 electrons. this element has one more proton than l…
The element - symbol pairs are correctly matched as shown in the table. Each row's description correctly corresponds to the element symbol in column B.
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demareas’s employer has started using a new industrial cleaner. even th…
B. No
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which representation conveys that the probability of finding an electro…
D.
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a biochemist carefully measures the molarity of calcium carbonate in 39…
$68.7\ \mu M$
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1st attempt see periodic table see hint select the orbital with the hig…
$n = 5,l = 2$
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how many orbitals are described by each of the below combinations of qu…
5 1
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question (2 points) how many electrons could have the following set of …
(a) 10 (b) 2
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61. when an element loses electrons during a chemical reaction, it has …
61. a. oxidized 62. d. $Ba_{3}N_{2}$ 63. b. $N_{2}+3I_{2} ightarrow2NI_{3}$ 64. b. $H_{3}O^{+}$ 65. acid: 0 - 7; water: 7; base: 7 - 14 66. $CH_{4}+2O_{2} ightarrow CO_{2}+2H_{2}O…
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53. in the following chemical equation, what is the mole ratio of alumi…
53. a. \(2:3\) 54. b. \(6\ mol\) 55. \(CO_2\) 56. b. endothermic 57. b. the octane and other hydrocarbon molecules breaking apart 58. photosynthesis 59. d. All of the above 60. b.…
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question 5 (1 point) build a lithium atom with the following symbol and…
| Name | Lithium - 7 | |--|--| | Number of Protons | 3 | | Number of Neutrons | 4 | | Mass | 7 | | Natural abundance | 92.23 | | Stable? | Stable |
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question 11 (1 point) the weighted average mass for all the isotopes of…
True
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question 10 (1 point) using this periodic table, what is the average at…
6.941
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question 9 (1 point) if you were to calculate an average mass of lithiu…
C. between 6 and 7 but closer to 7
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question 8 (1 point) which of these occurs in nature in a greater abund…
B. Lithium - 7
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question 7 (1 point) which 2 isotopes appear in nature? a lithium-6 b l…
A. Lithium - 6, B. Lithium - 7
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question 6 (1 point) build a lithium atom with the following symbol and…
Blank 1: 8 Blank 2: 3 Blank 3: 5 Blank 4: 8 Blank 5: 0
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question 5 (1 point) build a lithium atom with the following symbol and…
Blank 1: 7 Blank 2: 3 Blank 3: 4 Blank 4: 7 Blank 5: 92.5
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question 4 (1 point) build a lithium atom with the following symbol and…
Blank 1: 6 Blank 2: 3 Blank 3: 3 Blank 4: 6 Blank 5: 7.5
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question 3 (1 point) build a lithium atom with the following symbol and…
Blank 1: 3 Blank 2: 2
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question 2 (1 point) isotopes of the same element have a different _? a…
C. atomic mass
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question 1 (1 point) isotopes are atoms with the same number of protons…
A. neutrons
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analyze and interpret data 1. theme cause and effect based on my observ…
more. Evidence: Water has strong hydrogen - bonding between its molecules which is a type of cohesive force, while rubbing alcohol (isopropyl alcohol) has weaker intermolecular fo…
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in an experiment you are asked to react hydrochloric acid with sodium h…
100 mL Graduated cylinder
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medium sound waves must have a medium to travel through. in outer space…
1. Sound waves must have a medium to travel through because they are mechanical waves that rely on particle - to - particle interaction for propagation. 2. In outer space there ar…
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medium sound waves must have a medium to travel through. in outer space…
cannot
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3. theme cause and effect based on my observations in part iii, water (…
Water sticks to itself (cohesion) and sticks to other substances (adhesion). Evidence: Water forms a meniscus in a glass tube showing adhesion to glass, and water droplets form on…
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consider the reaction of production of nitrogen monoxide from nitrogen …
Causes the concentration of NO to increase and the concentration of $N_2$ and $O_2$ to decrease: adding $N_2$, adding $O_2$, removing $NO$, heating up the reaction mixture Causes …
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fill in the missing words a double arrow in the chemical equation indic…
1. reversible 2. remain constant
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fill in the missing words for the reaction $hgs(s)+o_2(g) ightleftharpo…
spontaneous; non - spontaneous
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multiple choice question moseley improved the pattern of properties in …
atomic number
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fill in the missing words use a thermochemical reaction of the reaction…
a) 420; 210 b) 420
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due sunday by 11:59pm points 10 submitting an external tool fill in the…
During an endothermic reaction the temperature of the reaction mixture decreases. During an exothermic reaction the temperature of the reaction mixture increases.
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which of these compounds might be an ingredient in commercial sunscreen…
The first compound (with the phenolic ring, ester, and alkyl chain) and the second compound (with two aromatic rings, a phenolic - OH, and a methoxy group) are the ones that might…
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select the correct answer. why might two elements possess similar chemi…
A. They belong to the same group of the periodic table.
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name these organic compounds: table with two columns: structure (contai…
| structure | name | |--|--| | | bromobenzene | | | Bromobenzene | |![Second structure](https://via.placeholder.com/100x100?t…