化学
化学反応、化学量論、分子構造、元素の性質。
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3. write down the volume of water in each set of beakers. set a 730 ml …
Set B has the greatest volume of water. The volumes are Set A: 730 ml, Set B: 1250 ml, Set C: 1100 ml. Since 1250 > 1100 > 730, Set B is the answer.
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question 10 of 10 a nonrenewable resource consisting of hydrocarbons fr…
D. fossil fuel
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question 5 of 10 the chemical reaction that occurs when gasoline and ai…
C. combustion reaction
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question 10 of 10 what atom should be balanced last when balancing hydr…
C. The oxygen atoms
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question 9 of 10 what reactants form a combustion reaction? a. water va…
B. A hydrocarbon and oxygen
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question 8 of 10 what is a combustion reaction? a. a reaction between a…
A. A reaction between a molecule and oxygen that produces heat
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question 5 of 10 which of the following is the correct model of $\\ce{c…
A. The model with the chain that represents 8 carbon atoms (the zig - zag chain long enough for \( C_8H_{18} \))
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question 4 of 10 what coefficient would the o₂ have after balancing c₃h…
A. 5
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question 3 of 10 which of the following is a combustion reaction? a. na…
C. $\ce{C_{3}H_{8} + 5O_{2} -> 3CO_{2} + 4H_{2}O}$
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question 2 of 10 what are all the products of a hydrocarbon combustion …
B. Carbon dioxide, water vapor, and heat
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question 1 of 10 what special information does the ball-and-stick model…
D. The ball - and - stick model shows the shape of the molecule.
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question 10 of 10 how many zn atoms are in zn(clo₃)₂? a. 1 b. 6 c. 3 d.…
A. 1
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question 9 of 10 what coefficient is needed to balance the reaction cac…
D. \( 2\text{HCl} \)
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question 8 of 10 what has a complete ionic equation of mg(s) + zn²⁺ + 2…
C. \( \text{Mg}(s) + \text{Zn(NO}_3\text{)}_2(aq) ightarrow \text{Mg(NO}_3\text{)}_2(aq) + \text{Zn}(s) \)
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question 6 of 10 if a reaction starts with 6 atoms of a solid and 12 at…
A. They will contain 18 atoms total in all the products.
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question 5 of 10 what does a complete ionic equation look like? a. all …
A. All ionic substances are written as separate ions in solution.
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question 4 of 10 what are the spectator ions in $\\ce{mg(s) + zn^{2+} +…
D. \( \text{NO}_3^- \)
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question 3 of 10 which of the following best describes a balanced react…
D. A reaction that has the same number and type of atoms on each side of the equation
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question 1 of 10 how is a net ionic equation written from a complete io…
B. The spectator ions are removed.
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question 10 of 10 what does it mean if a substance is soluble? a. it di…
A. It dissolves in water.
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question 9 of 10 what happens in a synthesis reaction? a. one substance…
C. Two substances combine to form a single new substance.
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question 8 of 10 what reaction shows a compound breaking apart into sep…
A. A decomposition reaction
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question 7 of 10 what kind of reaction is represented by fe + cuso₄ → c…
A. A single - replacement reaction
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question 6 of 10 what is the activity series of metals? a. a list of me…
D. A list of metals arranged in order of reactivity
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question 5 of 10 which of the following best describes a double - repla…
A. Atoms in one compound switch places with atoms in another compound.
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question 4 of 10 which of the following demonstrates a double - replace…
A. \(Na_{3}PO_{4}+MnCl_{2} ightarrow Mn_{3}(PO_{4})_{2}+NaCl\)
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question 3 of 10 which of the following is an example of a synthesis re…
A. \( \ce{H_2 + Br_2 ightarrow 2HBr} \)
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question 2 of 10 what happens in a single - replacement reaction? a. tw…
D. One reactant replaces an element in another reactant.
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question 1 of 10 which of the following is an example of a decompositio…
C. \( 2\text{NaCl} ightarrow 2\text{Na} + \text{Cl}_2 \)
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question 10 of 10 what are state symbols in a chemical equation? a. sym…
B. Symbols telling what form of matter the substances are in
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question 9 of 10 identify the reactants in the reaction hcl + naoh → na…
D. HCl and NaOH
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question 8 of 10 which of the following is the best definition of a che…
D. A change in a substance where one or more new substances form
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question 7 of 10 if the reactants of a reaction have one s and four o a…
A. One S atom and four O atoms
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question 6 of 10 which of the following is the most likely sign that a …
B. Two liquids are mixed at room temperature and a gas forms.
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question 5 of 10 which of the following describes a chemical reaction? …
D. Atoms in substances react with each other.
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question 4 of 10 what are the substances you start with in a chemical r…
C. The reactants
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question 3 of 10 where are the products in a chemical equation located?…
C. On the right side of the arrow in the equation
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question 2 of 10 which of the following reactions shows a physical chan…
D. $\text{NaCl}(s) ightarrow \text{NaCl}(aq)$
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question 1 of 10 which of the following represents a physical change? a…
A. Phase changing
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question 10 of 10 how does one determine a molecular formula from the e…
A. Multiply subscripts in the empirical formula by \(\frac{\text{molar mass}}{\text{empirical formula mass}}\)
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question 9 of 10 what is the percent composition of sulfur in so₂? a. \…
B. \(\frac{32.1\ \text{g}}{(32.1\ \text{g} + 16.0\ \text{g} + 16.0\ \text{g})} \times 100\%\)
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question 8 of 10 what is the molecular formula of the compound ch₂ with…
C. \( C_3H_6 \)
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question 7 of 10 what does percent composition tell you about a molecul…
D. It tells you how much of a molecule is made up of each element.
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question 6 of 10 so₃ is an empirical formula for which of the following…
A. \(S_2O_6\)
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question 5 of 10 which of the following represents the mass of 1 molecu…
C. 34.1 amu
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question 4 of 10 which conversion factor would be used to convert g/mol…
C. mol/L
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question 3 of 10 what is the molar mass of a compound? a. the mass in g…
A. The mass in grams of 1 mole of the compound
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question 2 of 10 how does one determine an empirical formula from a per…
D. Convert mass percents to moles and then divide by the smallest mole value to get subscripts
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question 1 of 10 how many atoms are in 64 g sulfur (s)? a. 32(6.02×10²³…
C. \(2(6.02\times 10^{23})\) atoms
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question 9 of 10 what is the molarity of 6 moles (mol) of nacl dissolve…
B. $\frac{6\ \text{mol}}{2\ \text{L}}$
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question 7 of 10 what is made when a salt is dissolved in water? a. a s…
A. A solution
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question 6 of 10 what is molarity? a. a measurement of the concentratio…
A. A measurement of the concentration of a solution
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question 5 of 10 which of the following best describes a mole as used i…
B. A very large number of objects
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question 1 of 10 how many atoms does 32 g of sulfur contain? a. $32 \\t…
B. \( 6.02 \times 10^{23} \)
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look at this sentence: the hunters identified traces of the deer in the…
1. tracks or other signs left behind by the passing of a person or animal: The search party found no trace of the missing hikers.
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2) \\underline{6} k + \\underline{\\quad} b₂o₃ → \\underline{3} k₂o + \…
6, 1, 3, 2 ### Problem 3:
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7 multiple choice 5 points select the correct formula for potassium iod…
7. KI 8. $\text{CuCl}_2$
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5 multiple choice 5 points select the correct formula for carbon disulf…
5. $\text{CS}_2$ 6. $\text{Fe(SO}_3\text{)}_2$
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2 multiple answer 5 points select the four signs of chemical reactions …
## Question 2: - Unexpected color change - Formation of a precipitate - Formation of a gas - Formation of heat and/or light ## Question 3: Production of a gas
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1) recall from the introduction that to tare (or zero) a balance means …
B. No calculation is needed to determine the mass of the sample added to the weighing boat.
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4. francis galton was influential in founding which of the following fi…
D. eugenics
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which of the following best describes peat? a liquid form of fossil fue…
an early stage of coal formation
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what is the main component of coal? helium carbon hydrogen oxygen
carbon
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at what temperature does water turn from liquid to steam? 0°f 212°f 50°f
212°F
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what was the primary focus of rachel carson’s book \silent spring\? che…
chemical use in society
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how does chemical weathering occur? plants, lichens, and mosses acceler…
by chemically breaking down rocks by water and gases
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isotope symbols a (# of protons + # of neutrons) x z (# of protons)
- Box next to A: Mass Number - Box next to X: Chemical Symbol of the Element - Box next to Z: Atomic Number (or Number of Protons)
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9. label: image of molybdenums element box with labels e, a, a, a point…
- e: Element Name - a (pointing to 42): Atomic Number - a (pointing to Mo): Element Symbol - A (pointing to 95.94): Average Atomic Mass
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laboratory simulation lab data mass of sodium chloride (g) 18.6 mass of…
18600
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which act regulates the chemicals used in mining and elsewhere? toxic s…
Toxic Substance Control Act
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how many ions of sodium are in a 71.0 g na₂so₄ sample? ? × 10^? na⁺ ion…
The coefficient (green box) is \( 6.02 \) (or \( 6.02 \)) and the exponent (yellow box) is \( 23 \). So the number of \( \text{Na}^+ \) ions is \( \boldsymbol{6.02 \times 10^{23}}…
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how many atoms of hydrogen are present in a sample of c₆h₈o₆ that has 2…
Green box: 1.97, Yellow box: 24
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g c → moles c → moles h → atoms h what conversion factor is used to con…
1 mole C / 12.01 g C
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which pathway correctly describes how to solve the problem below? \how …
C. g C → moles C → moles H → atoms H
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theobromine molar mass in this problem, we want to eventually determine…
The number of nitrogen atoms is approximately \( \boldsymbol{3.34\times10^{24}} \) (or more precise \( 3.343\times10^{24} \))
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read the following passage from a paper discussing the effects of disca…
D. Cigarettes should be banned because smoking kills not just smokers but the people and animals around them.
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topic: writing progress question id: 1062848 the movement of the progre…
The most effective conclusion is: In closing, the evidence for wearing sunscreen is clear and bright, while the arguments against it are partly cloudy at best. Use it every day, a…
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the movement of the progress bar may be uneven because questions can be…
A. Linking
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what is the mass of one molecule of glucose, c₆h₁₂o₆? the molar mass of…
The coefficient (green blank) is \( 2.992 \) (or \( 2.99 \) or \( 3.00 \) depending on rounding, but more accurately from the calculation above \( 2.992 \)) and the exponent (yell…
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which pathway correctly describes how to solve the problem? \what is th…
A. particles \( \ce{C5H12} ightarrow \) mol \( \ce{C5H12} ightarrow \) mass \( \ce{C5H12} \)
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a chemist obtains a sample of sodium sulfate, $\\ce{na_{2}so_{4}}$, wit…
The coefficient (green blank) is \( 3.01 \) and the exponent (yellow blank) is \( 23 \). So the answer is \( 3.01 \times 10^{23} \) formula units.
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can you think of any other common workplace hazards – especially ones i…
3. Slippery floors 4. Poor ergonomics (e.g., uncomfortable chairs) 5. Exposure to chemicals
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mass number = big number atomic number = smaller number protons = small…
3. Protons = 1 4. Neutrons = 0 5. Electron = 1 6. E.C= 1 7. What is the valence (the last number in the e.c) electron? 1 8. What group is H in the periodic table? Group 1 9. What …
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mass number = big number atomic number = smaller number protons = small…
3. Protons = 17 4. Neutrons = 18.5 5. Electron = 17 6. E.C= 2,8,7 7. Valence electron = 7 8. What group is Cl in the periodic table? Group 17 (or 7A) 9. What PERIOD is Cl in the p…
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mass number = big number atomic number = small number protons = small #…
3. Protons = 3 4. Neutrons = 4 5. Electron = 3 6. E.C= 2, 1 7. What is the valence (the last number in the e.c) electron? 1 8. What group is Li in the periodic table? Group 1 9. W…
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mass number = big number atomic number = small number protons = small #…
3. Protons = 3 4. Neutrons = 4 5. Electron = 3 6. E.C = 2,1 7. Valence electron = 1 8. Group = 1 9. Period = 2 10. B
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unlawful chemistry: the chemical equation below is unbalanced. you will…
- Mass of $\text{O}_2$ that reacts: $\approx 32.1\ \text{g}$ - Mass of $\text{Li}_2\text{O}$ produced: $\approx 59.9\ \text{g}$ - Total mass of all reactants: $\approx 59.9\ \text…
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the most common ways to treat cancer include _______. a. chemotherapy, …
A. chemotherapy, radiation, and surgery
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which of the following statements about tobacco products is true? a. to…
A. Tobacco products contain over 4,000 different chemicals.
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which of the following forms of alcohol can be consumed? a. propanol b.…
D. ethanol
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carbon monoxide, a substance found in tobacco smoke, is also found in _…
B. vehicle exhaust
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which of the following chemicals, found in tobacco smoke, is also found…
B. acetone
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which of these is a light element? (1 point) iron oxygen carbon lithium
D. Helium
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drugs modify the brain chemistry and change behaviors. please select th…
T. True
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8. a strong acid solution has h+=1.0×10⁻³ m. after dilution (adding wat…
- How does the pH change? The pH increases (from 3 to 4). - Initial pH: \( 3 \) - Final pH: \( 4 \) - Initial pOH: \( 11 \) - Final pOH: \( 10 \)
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1) where do you need to orient your eye level to take an accurate readi…
To take an accurate reading of the meniscus, you need to orient your eye level **horizontally with the meniscus** (specifically, at the same level as the bottom of the concave men…
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lock both doors on her side of the car. the smile nola gives mrs. dietr…
Nola views talking with her mother (through their shopping trips) as a meaningful, comforting bond that became an important anchor after her parents' separation. Evidence includes…
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1 racha de semanas nivel 4 ar 4 of 4
Argon has 8 valence electrons.
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bonds can be formed between atoms that come from the same region of the…
- Ionic: Atoms from the metal region (left/groups 1-2) and nonmetal region (right/groups 16-17) of the periodic table. - Metallic: Atoms from the metal region (left/middle of the …
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claim - evidence - reasoning you solved the four digital locks, gatheri…
### Claim: The strength of inter - and intramolecular forces directly influences the physical properties of substances, such as boiling point, melting point, and solubility. Subst…