Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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reactant p contains 50 j of energy, and reactant q contains 35.3 j of e…
A. Energy is absorbed because the product has more energy than the reactants have.
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according to hesss law, if a series of intermediate reactions are combi…
the sum of the enthalpy changes of the intermediate reactions.
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4. the ionic radii of the ions $s^{2-}$, $cl^{-}$, and $k^{+}$ are 184,…
The ions \(S^{2-}\), \(Cl^-\), and \(K^+\) are isoelectronic (same electron count). Their ionic radii differ because of varying nuclear charges: \(S^{2-}\) (16 protons), \(Cl^-\) …
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which substance has δhf defined as 0 kj/mol? ○ h₂o (s) ○ ne (l) ○ f₂ (g…
C. $F_2$(g)
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consider the following intermediate chemical equations. $$\\ce{p4(s) + …
-1,300 kJ (the option with -1,300 kJ)
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a sample of octane (c₈h₁₈) that has a mass of 0.750 g is burned in a bo…
30.0 kJ (corresponding to the option "30.0 kJ")
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chemistry – unit 4 worksheet 4 answer the following questions on your o…
### 1a - Carbon: \( \boldsymbol{\frac{8.44}{20.0}} \) - Hydrogen: \( \boldsymbol{\frac{1.30}{20.0}} \) - Oxygen: \( \boldsymbol{\frac{10.26}{20.0}} \) ### 1b - Carbon: \( \boldsym…
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the overall change in enthalpy of a reaction depends only on the reacta…
the reactants and the products.
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propane (c₃h₈(g), △h_f = -103.8 kj/mol) reacts with oxygen to produce c…
-2,044.0 kJ/mol
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which statement describes the law of conservation of energy? ○ all syst…
C. Energy cannot be created nor destroyed, but it changes from one form to another.
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digby wants to determine how many calories are in his bag of chips. whi…
B. bomb calorimeter
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carbon can cycle within and between the geosphere, atmosphere, hydrosph…
Step 1: Carbon moves from the geosphere to the atmosphere via fossil fuel combustion. Step 2: Carbon is removed from the atmosphere via rainfall and interacts with the geosphere v…
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for energy. when fossil fuels burn, they undergo a chemical reaction kn…
| Process | Stores carbon | Releases carbon | |----------------------|---------------|-----------------| | Limestone formation | $\circ$ (checked) | $\circ$ | | Volcanic activity …
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s law allows you to find the net enthalpy of the magnesium combustion b…
Hess
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question 18 the ph scale for acidity is defined by $\\text{ph} = -\\log…
\( 5.62 \times 10^{-6} \) (entered as 5.62*10^-6)
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humans extract fossil fuels and burn them for energy. when fossil fuels…
- Carbon - based fuel: Reactant - Carbon dioxide: Product - Water vapor: Product - Oxygen: Reactant
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2. phosphorous pentachloride is a fine grained powder, ranging in colou…
$6.0\times 10^{-3}$
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6.42×10²⁴ silicon atoms m = g
\(\approx 301\) (or more precise \(300.5\))
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4.60×10²³ lead atoms m = g submit request answer
\(158\) (or more precisely, around \(158\) when calculated, the exact value can be \( \frac{4.60\times10^{23}}{6.022\times10^{23}}\times207.2\approx158\) g)
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what is the rhyme scheme of this poem? my favorite food is bread. ive g…
A. aabb
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4.60×10²³ lead atoms m = submit request answer
\( 158 \) (or more precise value around 158 depending on calculation precision)
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3.87×10²² zinc atoms m = g
\(4.20\)
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part a 1.27×10²⁰ uranium atoms m = g submit request answer
\( 0.0502 \) (or more precise calculation: \( \frac{1.27\times10^{20}\times238.03}{6.022\times10^{23}} \approx 0.0502 \, \text{g} \))
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3. list the following ions in order of increasing radius: li⁺, mg²⁺, br…
\( \text{Mg}^{2+} < \text{Li}^+ < \text{Br}^- < \text{Te}^{2-} \)
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missed this? watch kcv: the mole concept, iwe: the mole concept - conve…
\(0.0502\) (or more precise: ~0.0502 g, depending on significant figures)
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1.27×10²⁰ uranium atoms m = g submit request answer
\( 0.0502 \) (or more precise: \( \approx 0.0501 \, \text{g} \) if calculated with more precision)
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4.07×10²¹ ca atoms express your answer using three significant figures.…
\( 6.76\times 10^{-3}\) mol
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6.21×10²³ k atoms express your answer using three significant figures. …
\( 1.03 \)
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part b 2.60×10²² he atoms express your answer using three significant f…
$0.0432$ (or $4.32\times10^{-2}$)
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3.2×10²⁴ pb atoms express your answer using two significant figures. ν …
\( 5.3 \)
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5. what type of intermolecular force gives water many of its characteri…
D. hydrogen bonding
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4. the term universal solvent means that water can dissolve more substa…
A. ionic compounds and polar molecules but not nonpolar molecules
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3. what type of intermolecular force forms during the solvation process…
D. ion - dipole forces
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2. ionic compounds and polar molecules can both dissolve in water. whic…
The ionic compound will dissociate, but the polar molecule will not.
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missed this? watch kcv: the mole concept, iwe: converting between moles…
\( 11.0 \)
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water and its properties quiz cp chemistry a o / module 6: covalent com…
\( \text{SO}_2 \) dissolves and dissociates in water, forming ion - dipole attractions with the water molecules. (The option with this statement, likely the third radio - button o…
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5. what is the strongest type of intermolecular force present between s…
C. hydrogen bonding
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4. which compound(s) would have dipole-dipole forces of attraction betw…
\( \text{PCl}_3 \), \( \text{SCl}_2 \) (The checkboxes corresponding to \( \text{PCl}_3 \) and \( \text{SCl}_2 \) should be selected)
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3. which statement is correct about intermolecular versus intramolecula…
C. Intramolecular forces exist within a single molecule. Covalent bonding is an example. (Note: Assuming the third option is labeled as C; adjust identifier based on original ques…
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2. which characteristic(s) is/are properties of a molecular compound? s…
- has a low boiling point temperature - exists as a liquid or gas at room temperature
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1. hydrogen bonding is a type of intermolecular force that exists betwe…
Fluorine, Oxygen, Nitrogen
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question 8 1 pts which atomic orbitals form the $sp^3d$ hybrids one s, …
D. one s, three p, one d (assuming the last option is D; if options are labeled as per order, the last option with "one s, three p, one d")
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question 7 1 pts the ( sp^3 ) hybridization has what percent s characte…
25%; 75% (corresponding to the option with 25% s character and 75% p character, e.g., if the last option is "25%; 75%", then the answer is that option)
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practice problem 2: (find the molar mass) compound\tmolar mass (g/mol) …
To find the molar mass of each compound, we use the atomic masses of the constituent elements (from the periodic table: Na = 22.99 g/mol, O = 16.00 g/mol, Cu = 63.55 g/mol, N = 14…
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question 6 1 pts a central atom that is $sp^2$ hybridized could bind up…
A. three
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question 4 1 pts which one of these is not a hybrid orbit? sp sp³ d²sp³…
\( dp \) (the option with "dp") ### Question 5
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question 2 1 pts a double bond consists of one sigma and one pi bond. o…
A. one sigma and one pi bond. ### Question 3
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question 1 1 pts a sigma bond, \\(\\sigma\\) \\(\\bigcirc\\) may exist …
A. may exist alone or in conjunction with a pi bond.
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question 7 1 pts the molecular geometry about the carbon atoms in $c_2h…
D. Tetrahedral
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part 1: the two basic types of energy directions: determine the best ma…
### Part I 1. (b) Potential Energy 2. (b) Potential Energy 3. (a) Kinetic Energy 4. (d) Both forms of Energy 5. (b) Potential Energy ### Part II (Underline the situation with grea…
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how many molecules are in 1 mol of molecules? express your answer in mo…
\( 6.022 \times 10^{23} \)
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question 4 1 pts an octahedral compound probably has what hybridization…
D. $sp^3d^2$
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question 1 1 pts which of the following does not have an angular shape?…
\(N_3^-\) (the option with \(N_3^-\)) ### Question 2
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3.9×10²⁴ pb atoms express your answer using two significant figures. ν …
\( 6.5\)
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how many moles of gold atoms do $7.35 \\times 10^{24}$ gold atoms const…
\( 12.2 \)
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which of the following has the largest bond order? o n₂ o n₂⁻ o n₂²⁻ o …
\( \text{N}_2 \) (the first selected option, \( \text{N}_2 \))
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question 7 1 pts which of the following statements about the polarity o…
C. A perfectly linear molecule will always be a polar molecule. ### Question 8
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scientists sometimes want to show whether more energy is used or releas…
\( 6\text{CO}_2 + 6\text{H}_2\text{O} + \text{light energy} ightarrow \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \)
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when molecules such as water and carbon dioxide undergo a chemical reac…
A. more... used
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15 mark for review which choice best states the function of the underli…
C. To describe the process the team used to reach their determination
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how do carbon dioxide, water, glucose, and oxygen differ? select all th…
A. the combination of atoms B. the arrangement of atoms C. the combination of bonds (Note: All three options are correct as explained above.)
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2. based on their positions in the periodic table, predict which has th…
Rb
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what causes the formation of volcanoes? (1) before humans understood th…
Geography (under Natural Science)
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name(s): 1. nitric oxide is a highly reactive, colourless and poisonous…
The value of \( K_{eq} \) is approximately \( 184 \) (or \( 1.84\times10^2 \)) (depending on rounding during calculation; precise value from steps is ~183.5).
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cations have __________ electrons and thus have a __________ charge. lo…
A. lost; positive (assuming the first option is labeled A, if not, the option with "lost; positive")
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fill in the blank question the process by which a gas changes to a liqu…
condensation
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1 multiple answer 2 points what is alcohol made of? vegetables differen…
C. different fruits, vegetables, and cereal
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3 cutting a piece of aluminum foil 4 rust forming on a bike chain 5 mix…
One way is the formation of a new substance, indicated by signs like gas bubbles (e.g., from mixing vinegar and baking soda), color change, or a precipitate forming. #### 2.
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part 1: definitions physical change – a change that affects the form or…
1. P 2. C
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directions: solve the problems shown below. any data, calculations, or …
Cl
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determine the empirical formula of a compound that contains 49.4% k, 20…
d) $\ce{K2SO3}$
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determine the empirical formula of a compound that contains 49.4% k, 20…
d) $\ce{K2SO3}$
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an aqueous solution of licl is 34.0 % licl. what mass of water is prese…
e) 165.0 g
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what mass of pbcl₂ contains 1.0 × 10²⁴ atoms of cl? a) 0.83 g b) 130 g …
d) 230 g
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the number of p atoms in 1.0 g of ba₃(po₄)₂ is: a) 5.0 × 10⁻²² b) 2.0 ×…
b) \( 2.0 \times 10^{21} \)
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water phase change graph what is the boiling point of water? what is th…
Boiling point of water: \( 100^\circ\text{C} \) Melting point and freezing point of water: \( 0^\circ\text{C} \) Phase change at point B: Melting (Fusion) Phase change at point D:…
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i neer was struck before that hour with love so sudden and so sweet, he…
The poem’s structure (rhyme scheme, rhythmic lines, and stanza progression) contributes to its meaning by: 1. **Lyrical Rhythm & Rhyme**: A consistent rhyme scheme (e.g., ABAB - l…
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directions: for the problems below identify the missing reactants or pr…
s: ## Problem 4: Balanced equation: $ \boldsymbol{2\text{Mg} + \text{O}_2 ightarrow 2\text{MgO}} $ ## Problem 5: Balanced equation: $ \boldsymbol{4\text{Fe} + 3\text{O}_2 ightarro…
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3. synthesis: how might an increase in extreme weather events (like hea…
- Impact on A Horizon: Extreme weather (storms: erosion; drought: compaction/structural loss) destabilizes the A Horizon (topsoil, nutrient/organic - rich layer). - Economic Stabi…
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when you carefully place each of these liquids into a cup, they will no…
The liquid that will sink to the bottom is "water with 2 cups of sugar" (the option with 2 cups of sugar added to water).
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why is the liquid more dense when sugar was added? increase mass = decr…
B. increase mass = increase density (assuming the second option is labeled as B, if we consider the first option as A and the second as B. If the options are just the two statemen…
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poem requirements: • 4 stanzas, 6 lines each • rhyme scheme: a,b,a,b,c,…
The subfield under Arts that applies is Literature (or Writing). The poem should be structured with 4 stanzas of 6 lines each, rhyme scheme A,B,A,B,C,C per stanza, and focus on a …
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poem requirements: • 4 stanzas, 6 lines each • rhyme scheme: a,b,a,b,c,…
Here's a completed poem following the requirements, with "rose" as the natural subject: **Stanza 1 (Introduce with similes, A,B,A,B,C,C):** 1 (A): A rose is soft like a cloud’s ge…
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the ph scale the concentration of hydronium ions in a solution in measu…
To solve this, we use the given rules about pH (acid <7, base >7, neutral =7) and indicator colors: ### Step 1: pH = 1 - **Acid/Base/Neutral**: pH <7 → Acid - **Phenolphthalein**:…
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poem requirements: • 4 stanzas, 6 lines each • rhyme scheme: a,b,a,b,c,…
1 (A): A rose is soft like a cloud's gentle sigh 2 (B): Its petals bloom like a painter's bright dye 3 (A): A rose is sweet like a lullaby 4 (B): Its thorns stand sharp like a gua…
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analyze the author’s use of text structure to achieve the purpose. part…
| Signal Words and Phrases | composed of, structure, properties, reactions | |--------------------------|-----------------------------------------------| | Identifying Questions |…
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lesson activity analyzing structure and purpose this activity will help…
Part A: Organic Chemistry
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winds are caused by air moving around in the atmosphere. wind turbines …
C. solar energy
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which event occurs during an exothermic reaction? (1 point) heat and li…
A. Heat and light are released to the environment.
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use the equation to answer the question. a + b → ab which type of react…
C. synthesis
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use the generalized chemical equation to answer the question. a + bc → …
C. single replacement
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one atom of sodium (na) has a mass of 23 amu (atomic mass units). accor…
46 amu (the option with "46 amu")
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100 g of mercuric oxide decomposes to produce oxygen of oxygen (o) and …
93 g (corresponding to the option "93 g")
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which statement correctly explains how matter is conserved in chemical …
The number of atoms in the reactants is always equal to the number of atoms in the products. (The option with this statement, typically the third radio button option in the given …
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58. compare and contrast nuclear reactions and chemical reactions: | co…
| Comparison Category | Nuclear reactions | Chemical reactions | |---------------------------|---------------------------------------|------------------------------------| | Funda…
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which of the following equations shows a physical change? (1 point) \\(…
A. $\ce{H2O(s) -> H2O(l)}$
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(5 points) sodium radon magnesium chlorine calcium 2 2 7 1 8
- Sodium: box with 1 (valence electrons: 1) - Radon: box with 8 (valence electrons: 8) - Magnesium: box with 2 (valence electrons: 2) - Chlorine: box with 7 (valence electrons: 7)…
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calculate the mass of aluminum hydroxide. al(oh)₃ please show all work …
The molar mass (mass of 1 mole) of $\ce{Al(OH)3}$ is approximately $\boldsymbol{78.00\ \text{g/mol}}$. (If moles are provided, substitute into $mass = n × 78.00$ to find mass.)
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give one example of a physical change and one example of a chemical cha…
Physical change: Ice melting (changes from solid to liquid state, substance remains H₂O). Chemical change: Wood burning (forms new substances like ash and carbon dioxide).
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13 what are the products of this reaction? * (0.5 points) ____agc₂h₃o₂(…
\(AgCl + Mg(C_{2}H_{3}O_{2})_{2}\) (the fourth option: \(AgCl + Mg(C_{2}H_{3}O_{2})_{2}\))