Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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question 11 (2 points) the ratio of total mass of the solute to the tot…
c) mass percentage
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question 9 (2 points) which of the following substances are completely …
b) ethanol and water
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question 8 (2 points) a dispersion of one liquid phase in another liqui…
d) emulsion
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question 7 (2 points) the particles in a colloid scatter a beam of visi…
e) Tyndall
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question 6 (2 points) pressure has an appreciable effect on the solubil…
c) gases
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name these organic compounds: structure image of a benzene ring with a …
1 - bromo - 3 - fluorobenzene
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question 5 (2 points) the relationship between the pressure and the sol…
b) Henry's
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question 4 (2 points) the molality of a solution that contains 36.6 g o…
b) 3.13
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question 3 (2 points) the decrease in vapor pressure of an aqueous solu…
c) 614
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question 2 (2 points) the solubility of o2 in 100 g of water at 10.0 °c…
d) \( 1.7 \times 10^{-3} \)
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question 1 (2 points) formation of solutions where the process is endot…
c) they are accompanied by an increase in disorder
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27 soit la réaction suivante: mg$_{(s)}$ + 2 hcl$_{(aq)}$ $\ ightarrow$…
The volume of HCl solution is approximately \( 0.165 \, \text{L} \) (or \( 165 \, \text{mL} \))
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part b what is the mass, in kilograms, of a person who weighs 137 lb? e…
Value: \( 62.1 \), Units: kilograms (or \( kg \))
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exercices 1. suis-je un atome (a) ou une molécule (m)? spécifie le nomb…
A (1 atome) #### Part c) \( O_4 \)
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a container holds 0.340 qt of liquid. how many milliliters of lemonade …
Value: 322, Units: milliliters (or mL)
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perform each of the following conversions using metric conversion facto…
\(0.0427\space L\) ### Part B
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question 21 of 21 (1 point) | question attempt: 2 of unlimited structur…
To name these substituted benzene compounds, we use the IUPAC nomenclature for disubstituted benzenes (or use prefixes for multiple substituents) and consider the positions (ortho…
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name these organic compounds: table with two columns: structure (contai…
1. o - xylene (or 1,2 - dimethylbenzene) 2. o - bromochlorobenzene (or 1 - bromo - 2 - chlorobenzene) 3. o - dibromobenzene (or 1,2 - dibromobenzene)
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7. the disproportionation of p-toluenesulfonic acid is shown below: 3 a…
### Part (a) # Explanation: ## Step1: Recall second - order kinetics formula For a second - order reaction with a single reactant \(A\), the integrated rate law is \(\frac{1}{[A]_…
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read the passage from sugar changed the world. we all crave sweetness, …
B. New sources of sweetness use better techniques than the old sources did.
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the passage describes a chemical reaction. read the passage. then, foll…
| Substance | Reactant | Product | |--|--|--| | carbon dioxide ($CO_2$) | | $\checkmark$ | | ethanol ($C_2H_6O$) | | $\checkmark$ | | glucose ($C_6H_{12}O_6$) | $\checkmark$ | |
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vaporization is the process of a liquid becoming a gas. as a liquid hea…
Liquid to gas
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select the correct answer from each drop - down menu. why are biogeoche…
remains constant
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directions: select the correct answer from each drop - down menu. verti…
First drop - down menu: Groups (or Families) Second drop - down menu: Similar chemical properties
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2. single use water bottles impact the earth’s environment. write a com…
Single - use water bottles decompose in the ocean, releasing toxic chemicals into the ocean.
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omar observes that many buildings in his city were built using limeston…
The temperature and the amount of acid are variables. The type of limestone is a control.
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consider the reaction of calcium oxide and water: cao + h₂o → ca(oh)₂ 0…
Calcium oxide is a limiting reagent.
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naturally occurring magnesium has an atomic mass of 24.312 amu and cons…
$24.99$ ### Question 2
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question 7 1 pts how many protons are in potassium - 39? 24 20 39 15 19…
Question 7: 19 Question 8: $^{220}_{86}Rn$, $^{210}_{84}Po$, $^{197}_{79}Au$
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select the correct statement(s) for a sulfur isotope with 18 neutrons. …
For the sulfur isotope question: - it has 16 electrons - it has 16 protons - its mass number is 34 - its atomic number is 16 For the iron - 58 question: - 58
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the following table gives the number of protons and neutrons in the nuc…
C. B
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steel is an alloy containing fe atoms and c atoms. which of the followi…
B.
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2 mark for review a particle - level diagram of a metallic element is s…
C. equally shared and form nondirectional bonds
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question 8 10 pts aluminum hydroxide is one of the ingredients used in …
Question 8: 0.280 g Question 9: 81.88%
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copper atoms and zinc atoms have the same atomic radius, 135 picometers…
B. The diagram with two types of circles of the same size randomly distributed.
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3 mark for review which of the following best represents the ground - s…
C. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{4}\)
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3 mark for review which of the following best represents the ground - s…
C. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{4}$
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which of the following is the ground - state electron configuration of …
C. $1s^{2}2s^{2}2p^{6}$
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question 3 which of the following discoveries is j. j. thompson, an eng…
The discovery of the electron, a subatomic negatively charged particle, and its mass - to - charge ratio.
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which of the following ground - state electron configurations represent…
D. $1s^{2}2s^{2}2p^{6}3s^{1}$
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provide the atomic symbol of an isotope that has forty three protons, f…
$_{43}^{99}\text{Tc}^{4 +}$ $_{24}^{54}\text{Cr}^{3+}$
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provide the atomic symbol of an isotope that has eight protons, eight n…
$_{8}^{16}O^{2 - }$ $_{1}^{2}H^{+}$
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indicate the number of protons and neutrons in copper - 65. protons 36 …
For copper - 65: protons: 29 neutrons: 36 For the isotope with 17 protons, 20 neutrons and 18 electrons: $^{37}_{17}Cl^{-}$
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question 7 10 pts 4.7 g of metallic zinc reacts with copper(ii) chlorid…
4.6 g
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indicate the number of protons and neutrons in carbon - 14. protons 8 n…
protons in carbon - 14: 6 neutrons in carbon - 14: 8 protons in uranium - 238: 92 neutrons in uranium - 238: 146
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indicate the number of protons and neutron in boron - 11. protons 6 neu…
For boron - 11: protons = 5, neutrons = 6 For phosphorus - 31: protons = 15, neutrons = 16
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which three statements correctly describe the diagram above? select the…
- The oxygen atom (O) has a partial negative charge because its higher electronegativity pulls the shared electrons away from the carbon (C) atom. - The hydrogen atom (H) has a pa…
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5) choose the best answer. the three pieces of an atom are called ____.…
D. subatomic particles
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9) drag and drop the answers to the atom diagram. choices: neutron, nuc…
From top - left clockwise: electron cloud, electron, proton, nucleus, neutron
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10) choose the best answer. a(n) _____ is a specific type of atom or mo…
10. B. element 11. D. 98
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12) choose the best answer. which element does the chart describe? it i…
A. hydrogen
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13) match the descriptions with the elements. iron silicon calcium oxyg…
- The most abundant element on the earth is very reactive and is vital for air and water: Oxygen. - The most abundant element found in the earth's rocks is an important ingredient…
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4) choose the best answer. — are the smallest parts of matter that stil…
B. Atoms
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2) choose all that apply. which two facts are about electrons? they rep…
They move extremely fast in the electron cloud around the atom's nucleus. The negatively charged particles are smaller than protons and neutrons.
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1) choose all that apply. which two types of particles sit tightly toge…
B. protons, C. neutrons
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write a balanced reaction of nitrogen gas (molecular nitrogen) and hydr…
1 gram of nitrogen reacts with 3 grams of hydrogen producing 2 grams of ammonia
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what is the molar mass of calcium nitrate? write a correct formula of t…
For the first question: 164.1 g/mol For the second question: 0.00311 mol
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question definition of atomic mass most abundant isotope of carbon on e…
Definition of atomic mass: Average mass of all isotopes Most abundant isotope of carbon on Earth: Carbon - 12 Atomic mass of carbon: 12.012 Definition of mass number: Number of pr…
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why does the best antacid require the most drops of acid to change the …
First question: A. The best antacid can neutralize the most acid, so it resists changes in the pH the longest Second question: B. The antacids buffer at different pH C. A single d…
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in this experiment, which antacid was the most effective buffer? a alum…
First question: E. Calcium carbonate and magnesium hydroxide Second question: B. A different antacid would be found to be the most effective
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question 2 10 pts true or false? one mole of gold contains 197 atoms of…
Question 2: A. False Question 3: B. 10.4
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quiz instructions question 1 10 pts true or false? one mole of gold wei…
True
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what is the purpose of using hydrochloric acid (hcl) in this experiment…
HCl simulates stomach acid.
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question what is the function of phenol red in this experiment? it is a…
It is a pH indicator.
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question what is the purpose of testing distilled water without an anta…
Water is a negative control
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what is your prediction for this experiment? a all antacids will have t…
C. Different antacids will have a different effective buffering capacity C. I will add a different antacid to individual beakers and measure the number of drops of acid needed to …
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to rent a certain meeting room, a college charges a reservation fee of …
$t<7$
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short passage below then answer the question that follows. e cases of m…
B. Modern MPI incidents are commonly caused by fear during testing.
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read the claim below. gardeners should never use pesticides on their pl…
Pets and children often play in and around gardens, where they can be exposed to pesticides.
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the following model has an atomic number of \ \ and a mass number of \ …
# Explicación: ## Paso 1: Identificar protones y neutrones El número atómico es igual al número de protones en el núcleo del átomo. El número de masa es la suma del número de prot…
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氪（kr）的原子序数为36，质量数为84，这个中性氪（kr）原子包含多少个质子、多少个中子、多少个电子？ protons: 84, neutr…
protones: 36, neutrones: 48, electrones: 36
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哪个原子的质量最大? a. 8 p 7 n b. 9 p 6 n c. 8 p 8 n d. 7 p 8 n an atom with 8 p…
# Explicación: ## Paso 1: Calcular la masa atómica de cada átomo La masa atómica se aproxima a la suma del número de protones (p) y neutrones (n). - Para el átomo a: Número de pro…
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04 multiple choice in the atom, the ______ occupies most of its mass, w…
C. núcleo; nube de electrones
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read the scenario. monique is writing a speech on the need to eliminate…
D. farmers looking into organic growing practices
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use the image to answer the question. which of the following explains w…
The right beaker has more particles of solute.
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which acid - base chemical reaction is irreversible? (1 point) strong a…
strong acid added to water
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acid base solutions quick check hydrochloric acid is a strong acid. ace…
The dissociation constant for hydrochloric acid is greater than the dissociation constant for acetic acid.
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acid base solutions quick check use the information in the table to ans…
HA, HC, HB
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acid base solutions quick check which change would decrease the ph of a…
decreasing the concentration of $OH^-$ ions
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3. explain why there is a difference in ionic radius observed when neut…
3. Explanation provided above. 4. a. Fluorine (F) 5. d. Calcium (Ca) 6. None of the given options are correct as written. The correct decreasing electronegativity orders are: for …
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2. form a bond: drag electrons back and forth until the molecule of oxy…
2
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what is the lewis diagram for fluorine, f₂? (note: just fill in the das…
F - F
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5. think and discuss: how is the formation of covalent bonds similar to…
A. 6 B. 2
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1. using the periodic table below, create a diagram that displays the f…
1a: Diagram should have arrows of different colors for each trend as described. 1b: Ionization energy, electronegativity and electron - affinity have similar patterns due to effec…
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m clue this element is an alkali metal with 55 protons. this element is…
Cesium (Cs), Radon (Rn), Indium (In), Arsenic (As), Tin (Sn), Tellurium (Te), Oganesson (Og), Antimony (Sb), Carbon (C), Lead (Pb), Thallium (Tl)
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this element has 5 protons in its nucleus. the atomic number of this el…
Boron (B), Neon (Ne), Xenon (Xe), Argon (Ar), Krypton (Kr), Gallium (Ga), Germanium (Ge), Selenium (Se), Sulfur (S)
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this element has 116 electrons. this element has one more proton than l…
1. Livermorium (Lv) 2. Beryllium (Be) 3. Moscovium (Mc) 4. Silicon (Si) 5. Aluminum (Al) 6. Lead (Pb) 7. Nitrogen (N) 8. Barium (Ba)
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all of the following factors help to speed up chemical reactions except…
increased particle size
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the attraction between two oppositely charged ions describes what type …
B. ionic bonds
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which type of reaction occurs when smaller particles are bonded togethe…
synthesis reactions
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question 6 the subatomic particles responsible for the chemical behavio…
A. electrons
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organic foods tend to have higher levels of nutrients than nonorganic f…
F
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which of the following represents an inorganic molecule? sucrose choles…
sodium chloride
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question 16 (5 points) fill in the symbol, mass, protons, neutrons, ele…
Blank 1: Xe Blank 2: 131 Blank 3: 54 Blank 4: 77 Blank 5: 54
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the number of protons in an atom can be determined by _____ adding the …
C. the element's atomic number
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two atoms that share electrons but have unequal attraction for electron…
A. polar covalent bonds
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isotopes the number of in a nucleus determines the identity of the elem…
1. An atom of an element with the same number of protons but a different number of neutrons, having the same atomic number but a different atomic mass. 2. The mass number, which i…
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28. c 29. f 30. neon counting atoms 31. 5 cacl₂ 32. 12 co 33. 16 2na₃po…
34. 7 35. 60
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question 14 (1 point) fill in the symbol, mass, protons, neutrons, elec…
Symbol: K Mass: 39 Protons: 19 Neutrons: 20 Electrons: 19
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question 13 (5 points) fill in the symbol, mass, protons, neutrons, ele…
Blank 1: Ti Blank 2: 48 Blank 3: 22 Blank 4: 26 Blank 5: 22