Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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what causes noise pollution? microplastics airborne chemicals vibration…
C. vibrations in the air (assuming the options are labeled A - D with A: microplastics, B: airborne chemicals, C: vibrations in the air, D: greenhouse gases)
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what causes noise pollution? microplastics airborne chemicals vibration…
C. vibrations in the air (assuming the options are labeled A: microplastics, B: airborne chemicals, C: vibrations in the air, D: greenhouse gases)
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how is noise pollution best described? an unpleasant scent or smell unw…
unwanted or disruptive sound
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what causes noise pollution? airborne chemicals microplastics vibration…
C. vibrations in the air (assuming the options are labeled A: airborne chemicals, B: microplastics, C: vibrations in the air, D: greenhouse gases)
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5 multiple choice 10 points predict the products for the following reac…
1. $\text{Br}_2 + \text{AlF}_3$ 2. $\text{H}_2 + \text{MgCl}_2$
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c. how many electrons does it have? 10. compare sodium (na) and chlorin…
Sodium (Na) #### Part 2: Which one is nonmetal?
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part c: application & critical thinking 9 oxygen has an atomic number o…
8 ### ii. How many electrons does it have?
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1. define ( r_f ) value. 2. a student performs this experiment and reco…
1. The $R_f$ (retention factor) value is the ratio of the distance a solute component travels to the distance the solvent front travels in a chromatography experiment, used to ide…
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part c: application & critical thinking 9. oxygen has an atomic number …
8 #### How many electrons does oxygen have?
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9. oxygen has an atomic number of 8. - how many protons does it have? _…
8 #### How many electrons does oxygen have?
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6 multiple choice 10 points what is the name of hf? hydrogen flouride f…
6. Hydrofluoric Acid 7. Lithium hydroxide
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4 multiple choice 10 points when aluminum reacts with copper (ii) chlor…
Cation (Copper)
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part b: periodic table basics 5. the vertical columns in the periodic t…
b) families/groups ### Question 6
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1. the smallest unit of an element that still has the properties of tha…
c) atom ### Question 2
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complete the following sentence: when k⁺ and cl⁻ forms an ionic bond...…
d) ... they are held together by electrostatic forces.
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maw. he assures them that their last sample is impure and quite useless…
D. It explains that he could not find the specific salt needed to make his transformation.
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“what! jekyll!” he cried. “i trust you are better.” “i am very low, utt…
A. It reveals why Jekyll looked so sad and would not join the men.
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experiment 2 pre - lab questions name: section: answer all calculation …
1. Density is mass per unit volume. Solids: $\text{g/cm}^3$; Liquids: $\text{g/mL}$ 2. Water displacement method 3a. $19.58\ \text{mL}$ 3b. $0.7125\ \text{g/mL}$
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chemistry • kearns high school period: ______ guide notes on chem stand…
The concentration of the solution indicates the **amount** of **solute** dissolved in a **given amount of solvent/solution** at a certain **temperature** (Note: The most standard …
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chemical bonds coal, graphite, and diamond are made of carbon. why are …
the number of bonds (the option with the text "the number of bonds")
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chemical bonds coal, graphite, and diamond are made of carbon. why are …
carbon (the option with "carbon" as the text, so the checkbox next to "carbon" should be selected)
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what is a factor that can significantly affect dissolved oxygen levels …
4. presence of chemical pollutants
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physical properties are those that are observable without changing the …
True
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when water turns into ice its chemical identity remains unchanged (liqu…
physical change
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2. the 2.6 g sample is c. identify the molar mass of c. i need a hint g…
12.01
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what does a physical property not describe? the chemical make - up of a…
the chemical make-up of a substance
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multiple-choice question what does a physical property describe? a char…
a characteristic that can be observed without changing the matter into another type of matter.
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sewage, manure, farm runoff, and fertilizers are associated with what t…
inorganic nutrient (the option labeled "inorganic nutrient")
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what class of water pollution can cause excessive growth of algae in wa…
A. inorganic nutrients such as nitrogen and phosphorus
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organic waste is especially problematic because it uses large amounts o…
manure from livestock feeding operations
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at what temperature is water most dense? 4 degrees celsius 95 degrees c…
A. 4 degrees Celsius
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which substance is known as the universal solvent because it can dissol…
Water
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which element of art did casteel use to create the flower on the bedspr…
Organic shape
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when water changes to a gas at temperatures below the boiling point, wh…
Evaporation
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16) if you insert 32.75 grams of h₂, how many moles of ch₃oh are produc…
The number of moles of $\ce{CH3OH}$ produced is $\boxed{8.19}$ moles (rounded to two decimal places) or $\boxed{8.1875}$ moles (exact value).
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must do - observing oxidation & reduction station data table observatio…
### Data Table | Observation Time | What You See | |-------------------|--------------| | Immediately | Shiny reddish-brown copper wire; colorless solution | | After 3-4 minutes |…
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co + 2 h₂ → ch₃oh 15) if you insert 2.27 moles of co, how many grams of…
Approximately 9.15 grams.
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14) if 77.32 grams of s are used, how many moles of al are used?
Approximately \( \boldsymbol{1.61 \, \text{moles}} \) of Al are used (or \( 1.607 \, \text{mol} \) for more precision).
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2 al + 3 s → al₂s₃ (13) if 3.12 moles of al₂s₃ are used, how many grams…
Approximately 300 grams (or 299.97 grams) of S are used.
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2 al + 3 s → al₂s₃ 13) if 3.12 moles of al₂s₃ are used, how many grams …
Approximately \( 300\ \text{g} \) (or more precisely \( \approx 299.97\ \text{g} \)) of S are used.
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12) if 1.95 moles of h₂o are used, how many grams of co₂ are used?
Approximately \(\boldsymbol{85.8}\) grams (or more precisely \(85.82\) grams) of \(CO_2\) are used.
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ch₄ + 2 o₂ → co₂ + 2 h₂o 11) if 2.59 moles of o₂ are used, how many gra…
\( \approx 20.8 \) grams (or more precisely \( \approx 20.77 \) grams)
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what happens to the particles of a substance as its temperature increas…
They move faster.
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nuclear chemistry worksheet using your knowledge of nuclear chemistry, …
$^{198}_{86}\text{Rn} ightarrow ^{194}_{84}\text{Po} + ^{4}_{2}\text{He}$
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2 fe₂o₃ + 3 c → 4 fe + 3 co₂ 9) how many moles of fe will be produced i…
\( \approx 0.694 \) moles (or more precisely \( 0.6937 \) moles)
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how do rock types contribute to the rate of weathering? porous minerals…
A. Porous minerals weather faster.
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which factor increases as a result of increasing altitude? air pressure…
space between gas molecules
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give 3 examples of weathering.
1. Freeze - thaw action (physical weathering): Water enters rock crevices, freezes (expands), and fractures the rock. 2. Oxidation (chemical weathering): Iron - rich rocks react w…
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which household activity is a significant source of volatile organic co…
C. using chemical - based cleaning products
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some rock formations emit a radioactive gas that is responsible for cau…
D. radon
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why do garages usually have low air quality? they are outside. chemical…
The correct option is: Chemicals are stored in garages.
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substance organic name, function and/or diagram aspirin (asa) acetylsal…
### Completed "Interesting Organic Molecules" Table: | Substance | Organic name, function and/or diagram | |-------------------------|---------------------------------------------…
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3. (partially visible text about health and risk) 4. copy the structura…
1. Oranges: Limonene (cyclic terpene) - flavor/aroma, antioxidant 2. Pine trees: Pinene (bicyclic terpene) - pest defense, pine scent 3. Ester #1 (Ethyl acetate): $\text{CH}_3\tex…
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determine the relationship between structure a and structure b in each …
### First Row: # Explanation: ## Step1: Analyze molecular formula Check the number of atoms: Structure A and B both have 3 C, 6 H, 1 O. But check bonding and arrangement. Isomers …
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draw the lewis structure created by the curved arrow. write in formal c…
The Lewis structure will have: - A carbon (C1) with a positive charge (\(+\)), bonded to a hydrogen (H), another carbon (C2) (which is bonded to three hydrogens), and a chlorine (…
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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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4. why may color change be an example of a chemical change?
A color change may indicate that new substances with different chemical properties have formed, which is the defining characteristic of a chemical change.
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ii. chimie (10pts) 1) compléter le texte ci - dessous en utilisant les …
1. L'électrode reliée à la borne négative du générateur est **la cathode** ; celle reliée à la borne positive du générateur est **l'anode**. Au cours de l'électrolyse de l'eau, le…
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read the information below and then answer the questions: foodborne ill…
1. Restated definition of foodborne illness: Foodborne illness (or food poisoning) is a disease caused by consuming food or drinks contaminated with germs, chemicals, bacteria, vi…
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chapter 20: environmental issues latin america save the environment as …
C. air ### Question 2
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country profile: cuba cuba is the largest island in the caribbean sea. …
- "island nation with extensive coastlines" - "important fishing industry" - "ruled by a Communist government" - "does not trade with close neighbor the United States" - "few mine…
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1. calculate the molarity of 0.060 moles nahco₃ in 1500. ml of solution…
0.040 M ### Problem 2
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s20 organic chemistry notes 1. provide a definition for organic chemist…
1. Organic Chemistry: The branch of chemistry focused on the study of compounds containing carbon (typically bonded to hydrogen, oxygen, nitrogen, and other elements), excluding s…
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1 jason works for a restaurant that serves only organic, local produce.…
D. Green business
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1 mol = 22.4 l for a gas at stp 1 mol = 6.02 x 10²³ particles 1. how ma…
\(0.05\space mol\) ### Question 2
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question 2 (multiple choice worth 2 points) (02.01r mc) which of the fo…
The positive and negative charges of the water molecule pull on the negative and positive ends of the ionic molecule to break them apart
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compute reaction rates for all seven trials assume that each tablets ma…
Full tablet: 29 mg/L/sec Eight pieces: 35 mg/L/sec Tiny pieces: 43 mg/L/sec
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compute reaction rates for all seven trials assume that each tablets ma…
For \( 3^\circ \text{C} \): 36 For \( 24^\circ \text{C} \): 146 For \( 40^\circ \text{C} \): 190 For \( 65^\circ \text{C} \): 352
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directions: use the information in unit 3 lesson 2 and lesson 3 to answ…
1. A. exponential population growth 2. Nutrients (nitrogen and phosphorus, from organic waste in sewage)
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combinations of two or more different elements held together in fixed p…
C. compounds
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the number of ______ in an atom determines which element it is. options…
C. protons
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temperature and energy as discussed in a prior lesson, we know because …
- Temperature comparison: The temperatures of the gases in the two containers are equal. This is because the average kinetic energy per particle is directly proportional to the te…
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a change of matter that occurs when atoms link together in a new way, c…
C. Chemical Change
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practice: mixed mole conversions (2-step) what is the mass of 8.07 x 10…
The mass of $8.07\times 10^{24}$ molecules of $O_2$ is $\boldsymbol{428.94\ \text{g}}$ (or we can also see from the given options, the calculation matches with $428.94\ \text{g}\ …
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icp chapter 2.2 vocabulary review (24pts) pretty simple. use my chapter…
### Physical property - **Definition**: A characteristic of a substance observable/measurable without changing its chemical identity (e.g., color, density, melting point). - **Exa…
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25. why is a hydrogen molecule (h₂) more stable than two separate hydro…
A hydrogen molecule ($\ce{H_2}$) is more stable because the two H atoms share electrons to form a covalent bond, giving each atom a stable electron configuration (duet of electron…
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the diagrams below show the structures of two ionic solids, sro and the…
A. \( \text{Mg}^{2+} \)
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the energy required to separate the ions in a nacl crystal lattice into…
A. $\ce{Na^{+}}$ has a smaller ionic radius than $\ce{Rb^{+}}$, so the distance between cation and anion is shorter in $\ce{NaCl}$ than in $\ce{RbCl}$.
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the triple point of most substances is a. always measured when a substa…
C. Less than atmospheric pressure
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the triple point of a substance is a. the point at which the substance …
D. The point where a substance can exist as a solid, liquid, or vapor at the same time at one specific pressure and temperature
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the pressure and temperature at which there is no longer a difference b…
C. Critical point.
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copper-nickel alloys are highly durable, resistant to corrosion, and ea…
A. The diagram with 15 white (copper) circles and 5 gray (nickel) circles (ratio 3:1)
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what is a practical use for knowing a substances triple point? a. tripl…
B. Calibrating thermometers using the triple point temperature
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which of the following is accurate about gases? a. gases are not fluid …
C. A gas must be contained in a closed container or it will escape into the atmosphere
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a characteristic of water vapor, but not other states of water, is a. w…
B. Water vapor is compressible
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a. writing chemical formulas of ionic compounds set ii directions: writ…
### A. Writing Chemical Formulas 1. $K_2S$ 2. $Be_3N_2$ 3. $H_2SO_3$ 4. $Mg(OH)_2$ ### B. Naming Ionic Compounds 1. Sodium sulfide 2. Calcium phosphate 3. Lithium nitride 4. Hydro…
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the three states of matter represent a. the amount of work a material c…
D. Diverse levels of molecular energy within a material or substance
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size, form, shape, and state relates to a. the critical point of matter…
D. The physical state of matter
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the energy change that takes place when the atoms of materials are rear…
C. Chemical energy
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how would the law of conservation of matter explain what happens to a c…
D. The liquid water is now water vapor of the same quantity
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practice: mixed mole conversions (2-step) how many moles of water (h₂o)…
\(\boldsymbol{0.94\space mol\space H_2O}\) (corresponding to the option: \(\boldsymbol{\square\ 0.94\space mol\ H_2O}\))
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according to the law of conservation, when matter changes state its ___…
B. mass
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what is the relationship between atoms and molecules? a. molecules are …
A. Molecules are made up of atoms
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identifying an isotope an isotope of the element fluorine has 9 protons…
fluorine-19
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determing an isotope use the drop - down menus to complete the statemen…
An isotope has the same number of **protons** but a different number of **neutrons** than other atoms of the same element.
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which of the following steps is required before bacteria can break down…
Water is placed in an aeration basin to increase oxygen
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identifying atomic number the element copper has 29 protons. what is th…
29
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1. the diagram above shows the repeating groups of atoms that make up t…
a. The properties will likely be different because the repeating groups of atoms that make up the samples are different.
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describing chemical symbols which statement accurately describes the ch…
B. The chemical symbol always begins with a capital letter.
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3. tiana is a chemist who is making a chemical to add to swimming pools…
c. Diagram C