化学
化学反应、化学计量、分子结构与元素性质。
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reacts with hcl. 29. zinc reacts with iodine in a synthesis reaction: $…
a. $610.3\ \text{g}$ (rounded to 4 significant figures) b. $84.5\%$ (rounded to 3 significant figures) --- ### Problem 30
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which proportion could you use to convert 7 liters to milliliters?$\fra…
Valid proportion: $\frac{1,000 \text{ milliliters}}{1 \text{ liter}} = \frac{? \text{ milliliters}}{7 \text{ liters}}$ 7 liters = 7000 milliliters
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name_____ period_____ date_____chapter 7 review worksheetcalculate the …
1. $98\ \text{g/mol}$ 2. $98\ \text{g/mol}$ 3. $111\ \text{g/mol}$ 4. $100\ \text{g/mol}$ 5. $160\ \text{g/mol}$ 6. $\approx 2.39\ \text{mol}$ 7. $\approx 0.48\ \text{mol}$ 8. $\a…
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23. the equilibrium constant, $k_c$, is 54.3 at 430 $^circ$c for the re…
A. 0.107 M --- ### Question 24
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chemical-emitting gases or solids from interior products and materials …
that have low levels of volatile organic compounds (VOCs)
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name: jackson alexander report: empirical formula data + calculations m…
Empirical formula of hydrate: $\text{CuCl}_2 \cdot 7\text{H}_2\text{O}$
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an element with mass 310 grams decays by 8.9% per minute. how much of t…
52.8 grams
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classify the following as a heterogeneous mixture (suspension), homogen…
homogeneous mixture (solution)
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compare the total mass of the reactants to the total mass of the produc…
12 g Cl₂ + 13 g K → 25 g KCl
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you can resize the interactive by slowly dragging the dashed lines to t…
$1s^2 2s^2 2p^6 3s^2 3p^5$ (the second option)
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you can resize the interactive by slowly dragging the dashed lines to t…
1s² 2s² 2p⁴
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you can resize the interactive by slowly dragging the dashed lines to t…
1s² 2s² 2p¹ (the third option)
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having problems staying logged in or are you experiencing issues? pleas…
1s² 2s²
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having problems staying logged in or are you experiencing issues? pleas…
$1s^2 2s^2 2p^6 3s^1$
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k shorthand: $1s^22s^22p^63s^23p^64s^2$ si shorthand: mn shorthand: zr …
- K: $[Ar]4s^1$ - Si: $[Ne]3s^23p^2$ - Mn: $[Ar]4s^23d^5$ - Zr: $[Kr]5s^24d^2$
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k shorthand: $1s^22s^22p^63s^23p^64s^1$ si shorthand: mn shorthand: zr …
- Sn Shorthand: $[\text{Kr}] 4d^{10} 5s^2 5p^2$ - Mn Shorthand: $[\text{Ar}] 3d^5 4s^2$ - Zr Shorthand: $[\text{Kr}] 4d^2 5s^2$
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ts elementary : building elements chapter pages tool: interactive perio…
1. Drag all orbitals (1s, 2s, 2p$_x$, 2p$_y$, 2p$_z$, 3s, 3p$_x$, 3p$_y$, 3p$_z$) to the "Drag objects here" area. 2. Assign electrons as follows: - Row 1 (1s): Fill the box with …
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electron configuration practice due date: chemistry e. in the space bel…
1) $1s^22s^22p^63s^1$ 2) $1s^22s^22p^63s^23p^64s^23d^6$ 3) $1s^22s^22p^63s^23p^64s^23d^{10}4p^5$ 4) $1s^22s^22p^63s^23p^64s^23d^{10}4p^65s^24d^{10}5p^66s^2$ 5) $1s^22s^22p^63s^2$ …
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a certain reaction is first order in $ce{n_{2}}$ and second order in $c…
Second row initial rate: $\boldsymbol{7.68 \times 10^4\ M/s}$ Third row initial rate: $\boldsymbol{2.63 \times 10^5\ M/s}$
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a certain reaction is first order in $ce{h_2}$ and first order in $ce{i…
Row 2 initial rate: $0.930\ \text{M/s}$ Row 3 initial rate: $0.689\ \text{M/s}$
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name type here date type here writing chemical formula & balancing chem…
1, 2, 1, 1
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name type here date type here writing chemical formula & balancing chem…
1, 2, 1, 1
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name type here date type here writing chemical formula & balancing chem…
2, 6, 2, 3
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writing chemical formula & balancing chemical equations - slide 13 writ…
1. For $\boldsymbol{HCl + NH_3 ightarrow NH_4Cl}$: Coefficients: 1 (HCl), 1 (NH₃), 1 (NH₄Cl) Missing names: Hydrochloric acid (HCl), Ammonium chloride (NH₄Cl) 2. For $\boldsymbol{…
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name type here date type here writing chemical formula & balancing chem…
Coefficients (left to right): $1$, $2$, $1$, $1$ Missing names: - HCI: Hydrochloric Acid - $\text{FeCl}_2$: Iron(II) Chloride Balanced equation: $\text{Fe} + 2\text{HCl} ightarrow…
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name type here date type here writing chemical formula & balancing chem…
### First Equation: Coefficients: 1 (for $\text{N}_2$), 1 (for $\text{O}_2$), 2 (for $\text{NO}$) Missing names: Nitrogen (under $\text{N}_2$), Nitrogen monoxide (under $\text{NO}…
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a(n) ______ is an accurate representation of visible light. a. eye b. r…
C. electromagnetic spectrum
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a. write balanced molecular (not ionic) equations for each of the follo…
## Part a (Balanced Molecular Equations): A. $\text{HNO}_3 + \text{KC}_2\text{H}_3\text{O}_2 ightarrow \text{KNO}_3 + \text{HC}_2\text{H}_3\text{O}_2$ B. $3\text{Mg(ClO}_3\text{)}…
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question 10 1 pts in a wet cell battery what is the electrolyte? zinc c…
liquid acid
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experiment 6 ions in solution: electrolyte strength and electrical cond…
1. A. $\text{BaCl}_2$: Ionic B. $\text{SO}_2$: Covalent C. $\text{HBr}$: Covalent D. $\text{KNO}_3$: Ionic and Covalent E. $\text{PbI}_2$: Covalent F. $\text{H}_2\text{C}_2\text{O…
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question 7 1 pts gas particles moving through a pinhole refers to what …
Question 7: Effusion Question 8: Increasing the temperature
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match each of the equations with their reaction type. $2\\text{nabr} + …
- $2\text{NaBr} + \text{CaF}_2 ightarrow 2\text{NaF} + \text{CaBr}_2$: double replacement - $\text{SnO}_2 + 2\text{H}_2 ightarrow \text{Sn} + 2\text{H}_2\text{O}$: single replacem…
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which chemical symbols will complete the equation for this decompositio…
First blank: $\text{K}$, Second blank: $\text{I}$
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synthesis na + cl₂ decomposition 2nacl single replacement 2na + 2h₂o do…
- Synthesis $\ce{Na + Cl2}$ → $\boldsymbol{2NaCl}$ - Decomposition $\ce{2NaCl}$ → $\boldsymbol{2Na + Cl2}$ - Single Replacement $\ce{2Na + 2H2O}$ → $\boldsymbol{2NaOH + H2}$ - Dou…
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what are the products from a combustion reaction always water only carb…
Carbon dioxide and water only
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9) a granite batholith is exposed at the surface, and over thousands of…
9) D. Unloading 14) C. It increases the rate of both mechanical and chemical weathering. 7) (Correct option not shown in the image, but the process is differential weathering)
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4) mechanical weathering changes the chemical composition of the parent…
4) False 11) True 6) The water carries weathered material downstream, where it is primarily deposited, building up features like deltas.
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12) granite, which is primarily composed of quartz and feldspar, genera…
12) True 5) Transported soil 3) Bedrock
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15) which factor has the most direct impact on increasing the rate of c…
C. High temperatures and abundant moisture
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13) which of the following landforms is created primarily through the p…
13) C. A river valley or canyon cut by moving water 2) Hydrolysis
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question 1 1 pts which of the following is not a principle of kmt? part…
Question 1: Particles are soft, squishy spheres. Question 2: Helium
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question 7 1 pts two firms, a and b, each currently dump 60 tons of che…
5000
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inquizitive chapter 2. methods 2.1 define key terms essential to sociol…
After seeing her dog eat chocolate and later get sick, a child tells a playmate that chocolate is bad for dogs. - inductive reasoning A dog, having gotten a bite of chocolate cake…
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select the dependent clause. frozen foods may lose water molecules and …
unless they are wrapped tightly
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of a chemical reaction. 32. list several reasons why the actual yield f…
32. - Side reactions form unwanted products - Reactants may not fully react - Product is lost during collection/purification - Starting materials contain impurities 33. Percent yi…
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8. which change can be reversed by physical means? a. burning wood b. r…
c. Dissolving sugar
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reacts with hcl. 29. zinc reacts with iodine in a synthesis reaction: $…
a. $610.3\ \text{g}$ (rounded to 4 significant figures) b. $84.5\%$ (rounded to 3 significant figures) --- ### Problem 30
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which proportion could you use to convert 7 liters to milliliters?$\fra…
Valid proportion: $\frac{1,000 \text{ milliliters}}{1 \text{ liter}} = \frac{? \text{ milliliters}}{7 \text{ liters}}$ 7 liters = 7000 milliliters
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name_____ period_____ date_____chapter 7 review worksheetcalculate the …
1. $98\ \text{g/mol}$ 2. $98\ \text{g/mol}$ 3. $111\ \text{g/mol}$ 4. $100\ \text{g/mol}$ 5. $160\ \text{g/mol}$ 6. $\approx 2.39\ \text{mol}$ 7. $\approx 0.48\ \text{mol}$ 8. $\a…
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23. the equilibrium constant, $k_c$, is 54.3 at 430 $^circ$c for the re…
A. 0.107 M --- ### Question 24
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chemical-emitting gases or solids from interior products and materials …
that have low levels of volatile organic compounds (VOCs)
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name: jackson alexander report: empirical formula data + calculations m…
Empirical formula of hydrate: $\text{CuCl}_2 \cdot 7\text{H}_2\text{O}$
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solubility rules and electrolytes possible points: 10 all sulfate compo…
$\boldsymbol{Ba^{2+}}$ and $\boldsymbol{Pb^{2+}}$
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solubility rules and electrolytes all compounds containing the anion ar…
$\boldsymbol{NO_3^-}$
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solubility rules and electrolytes possible points: 10 all compounds con…
$NH_4^+$, $K^+$, $Na^+$
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examine each of the following pairs of potential reactants. use activit…
### 8. $\text{Ca}(s) + 2\text{H}_2\text{O}(l) ightarrow \text{Ca(OH)}_2(aq) + \text{H}_2(g)$ ### 9. $2\text{Rb}(s) + 2\text{LiCl}(aq) ightarrow 2\text{RbCl}(aq) + 2\text{Li}(s)$ #…
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20. the equilibrium constant, $k_c$, is $6.5 \\times 10^4$ at $35^\\cir…
A. Q < K; reactants will be converted to products (shift to right) as equilibrium is being established. --- ### Question 21
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17. the equilibrium constant, $k_c$, is given for one of the reactions …
D. $K_c = 6.9 \times 10^{-10}$ --- ### Question 18
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an element with mass 730 grams decays by 27.6% per minute. how much of …
12.4 grams
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an element with mass 820 grams decays by 26.8% per minute. how much of …
$1.7$ grams
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an element with mass 310 grams decays by 5.7% per minute. how much of t…
182.9 grams
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question an element with mass 310 grams decays by 5.7% per minute. how …
191.3 grams
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100. identify the units for each symbol below:λ _________ν _________e _…
100. $\lambda$: nanometers (nm) or meters (m); $ u$: $\text{sec}^{-1}$; $E$: J/photon or kJ/mol 101. $6.93 \times 10^{-2}\ \text{m}$ 102a. $1.22\ \text{sec}^{-1}$ 102b. $0.820\ \t…
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a student runs two experiments with a constant-volume \bomb\ calorimete…
Is this reaction exothermic, endothermic, or neither? exothermic Heat released in the second experiment: 225 kJ Reaction enthalpy $\Delta H_{\text{rxn}}$ per mole of $\text{C}_2\t…
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a student dissolves 11.7 g of ammonium chloride ($\\text{nh}_4\\text{cl…
Is this reaction exothermic, endothermic, or neither? $\circ$ exothermic $\bullet$ endothermic $\circ$ neither Amount of heat absorbed: $3.0$ kJ Reaction enthalpy $\Delta H_{\text…
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a student dissolves 10.7 g of potassium hydroxide (koh) in 200. g of wa…
Is this reaction exothermic, endothermic, or neither? $\circ$ exothermic $\circ$ endothermic $\circ$ neither Amount of heat released: $8.0$ kJ Reaction enthalpy $\Delta H_{rxn}$: …
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a student dissolves 11.8 g of sodium chloride (nacl) in 250. g of water…
- Reaction type: endothermic - Heat absorbed by reaction: $1.6$ kJ - Reaction enthalpy: $\boldsymbol{7.9\ \frac{\text{kJ}}{\text{mol}}}$
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a student dissolves 13.6 g of ammonium nitrate ($\\text{nh}_4\\text{no}…
Is this reaction exothermic, endothermic, or neither? endothermic Amount of heat absorbed by the reaction: 6.0 kJ Reaction enthalpy $\Delta H_{\text{rxn}}$ per mole of $\text{NH}_…
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match each image with the evidence of a chemical change it illustrates.…
1. Image of person smelling → Odor Produced 2. Image of glowing light sticks → Light Produced 3. Image of exploding fireworks → Sound Produced 4. Image of changing liquid colors →…
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possible points: 28.57 determine if each observation below provides evi…
1. When a clear solution and a yellow solution are mixed, a dark solid forms at the bottom of the beaker. → Chemical Change 2. Salt dissolves in water, creating a clear solution. …
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try again your answer is wrong. in addition to checking your math, chec…
$12.7\ \frac{\text{kJ}}{\text{mol}}$
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thu 1/29: evidence of chemical change if a substance starts glowing dur…
C. Light emission
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which of following molecules would be most likely to form a linear stru…
Carbon dioxide
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20 essay 1 point $4nh_3(g) + 5o_2(g) \ ightarrow 4no(g) + 6h_2o(g)$ usi…
$1.01\ \text{L}$ (or $1.0125\ \text{L}$)
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find the molar masses of the following compounds and circle your answer…
1) $\text{NaBr}: 101.9\ \text{g/mol}$ 2) $\text{PbSO}_4: 303.3\ \text{g/mol}$ 3) $\text{Ca(OH)}_2: 74.1\ \text{g/mol}$ 4) $\text{Na}_3\text{PO}_4: 161.0\ \text{g/mol}$ 5) $(\text{…
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what number of atoms of nitrogen are present in 6.65 g of each of the f…
a. $\boldsymbol{2.35\times10^{23}}$ atoms b. $\boldsymbol{2.49\times10^{23}}$ atoms c. $\boldsymbol{3.18\times10^{22}}$ atoms
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question ⓘthe chemical formula of a compound gives the ratio of the ele…
3.17 × 10²² atoms
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learning: molecules and compounds calculations question ⓘ molar mass is…
175.4 g of Kr
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question ⓘ the empirical formula is a chemical formula that provides th…
C. HCN
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after looking over the results, what could be done to improve the desig…
D. Use additional chemicals and record the temperature change, cost, and health risks. E. Complete more trials.
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learning: molecules and compounds calculations question ⓘ percent mass …
O. O
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what number of molecules (or formula units) are present in 6.65 g of ea…
a. $\boldsymbol{2.35\times10^{23}}$ molecules b. $\boldsymbol{1.25\times10^{23}}$ molecules c. $\boldsymbol{1.59\times10^{22}}$ formula units
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question ⓘ molar mass is the mass of 1 mole, in grams, of a given subst…
58.12 g/mol
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question ⓘ molar mass is the mass of 1 mole, in grams, of a given subst…
1.32 mol of $\text{Na}_3\text{PO}_4$
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question ⓘ mass percent composition involves calculating the percentage…
C. 56.79%
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learning: molecules and compounds calculations question ⓘ mole is a lat…
1.22 moles of Co
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3. given the following information:sno₂ (s) + 2 h₂ (g) ↔ sn (s) + 2 h₂o…
$\approx 13.7$
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learning: molecules and compounds calculations question ⓘ the empirical…
C. CH
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study the data table. which compound should be used in the hand warmer?…
Calcium chloride because it had the greatest increase in temperature. It also has a low health warning, and the second-lowest cost.
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question ⓘcompounds calculationsa mole is a counting number that means …
1.65 × 10²⁴ molecules
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study the data table. which system produced the most thermal energy? so…
Calcium chloride in water.
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question ①the chemical formula of a compound gives the ratio of the ele…
15.7 g
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analyze it!several compounds were added to water and the results were r…
- All the compounds that were mixed with water experienced a change in thermal energy. - When magnesium sulfate mixes with water, it is an exothermic process. - When calcium chlor…
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learning: molecules and compounds calculations question molar mass is t…
A. $\text{CO}_2$
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learning: molecules and compounds calculations question ⓘ a mole is a c…
1.47 × 10²⁵ atoms
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learning: molecules and compounds calculations question ⓘ the empirical…
D. $\text{CH}_4\text{O}$
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how can thermal energy be transferred in or out of a system? select the…
There is more energy in the reactants than the products. It is exothermic. Heat exits the system. It is exothermic. There is less energy in the reactants than the products. It is …
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what types of changes can substances undergo? select the correct answer…
- When electricity is run through water, it breaks the molecule into the basic elements. This is a chemical change. - A physical change is reversible. - When water is heated, it c…
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how can a device be designed, tested, and modified to release thermal e…
A device that releases thermal energy via chemical processes can be designed, tested, and modified through this structured process: 1. **Design Phase**: Choose an exothermic chemi…
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pearson learning: molecules and compounds calculations return question …
1.79 × 10²⁴ molecules of SO₂