Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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multiple-choice question if different substances are present after the …
Chemical Change
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when matter undergoes a chemical change, the composition of the matter …
False
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4. what is the mass of 8.12 × 10²³ molecules of co₂ gas? (atomic mass o…
59.3 g
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which sentence uses this meaning of vacuum? vacuum verb to clean with a…
Guests will be here in five minutes, so we'd better vacuum quickly!
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3. note the mass of a copper(i) oxide formula unit in the image below. …
\(1181\space g\)
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helium is mixed with oxygen gas for deep - sea divers. calculate the pe…
4.4
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methane, the principal component of natural gas, is used for heating an…
438
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add a comma or semicolon if needed. otherwise, submit the text without …
Some plant species have spines to protect themselves or use chemical deterrents to repel insects.
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4. how do you know whether or not a new substance was produced in these…
Look for signs like color change, gas evolution, precipitate formation, temperature change, or odor change. These suggest a new substance is formed as they are chemical property a…
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a sample of nitrogen gas kept in a container of volume 2.52 l and at a …
0.503
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a certain amount of gas at 23.0 °c and at a pressure of 0.950 atm is co…
440
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dry ice is solid carbon dioxide. a 1.87 g sample of dry ice is placed i…
0.242 atm
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liquid a is known to have a higher viscosity and higher vapor pressure …
- For the first experiment: \(P_A\) will be greater than \(P_B\) - For the second experiment: \(V_A\) will be less than \(V_B\)
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phosphoric acid ($ce{h_3po_4}$) is a polyprotic acid. write balanced ch…
1. $\ce{H3PO4(aq) + H2O(l) <=> H2PO4^{-}(aq) + H3O^{+}(aq)}$ 2. $\ce{H2PO4^{-}(aq) + H2O(l) <=> HPO4^{2-}(aq) + H3O^{+}(aq)}$ 3. $\ce{HPO4^{2-}(aq) + H2O(l) <=> PO4^{3-}(aq) + H3O…
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each week capechem, a manufacturer of fine chemicals, uses up 750. kg o…
Maximum theoretical mass: 1500 kg Average actual mass: 1305 kg
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which bond in a fuel molecule (octane or dodecane) is the combination o…
B. magnet marble
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if morality represents the way we would like the world to work and econ…
The majority of people are honest.
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a certain anesthetic contains 64.9 percent c, 13.5 percent h, and 21.6 …
$C_4H_{10}O$
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when octane or dodecane reacts with oxygen to form water and carbon dio…
The reactant molecules (octane/dodecane and oxygen) must have their chemical bonds broken (bond breaking of reactant molecules) before new bonds can form to create the product mol…
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why do you think we need to put energy into the cylinder system to get …
We need to put energy into the cylinder system to provide the activation energy required for the fuel (gasoline/diesel) - oxygen reaction to start, as chemical reactions (like com…
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liquid x is known to have a lower surface tension and lower viscosity t…
For the first experiment: \(F_X\) will be less than \(F_Y\). For the second experiment: \(F_X\) will be less than \(F_Y\).
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activity c (continued from previous page) 4. compare: the accepted valu…
The formula with \( P \) and \( V \) on one side and \( R \), \( n \), and \( T \) on the other is \( PV = nRT \) ### 7A. Calculate Volume at STP
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the incentive scheme that rules sumo is intricate and extraordinarily p…
Ranking is everything.
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activity c: the ideal gas law get the gizmo ready: - select volume as t…
s: 1. A. \(T\) (so \(V \propto T\)) B. \(V \propto \frac{1}{P}\) 2. \(V \propto \frac{nT}{P}\) 3. A. \(V = \frac{nRT}{P}\) B. \(R = \frac{PV}{nT}\) C. (Example) \(P = 1\) atm, \(V…
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experiment predicted outcome a 250 ml beaker is submerged in a large co…
For the first part: \(m_A\) will be equal to \(m_B\). For the second part: It's impossible to predict whether \(p_A\) or \(p_B\) will be greater without more information.
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23 ccc energy and matter identify the dominant intermolecular force in …
Dominant intermolecular force in \(NH_3\): Hydrogen Bonding. Intermolecular forces in \(NH_3\) are weaker than in \(H_2O\) (since \(NH_3\) is gas, \(H_2O\) is liquid at room temp,…
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liquid x is known to have a lower viscosity and lower surface tension t…
- First experiment: \(m_X\) will be less than \(m_Y\) - Second experiment: It's impossible to predict whether \(V_X\) or \(V_Y\) will be greater without more information.
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22 ccc patterns explain whether hydrogen bonding is present between hyd…
Hydrogen bonding is present between hydrogen fluoride (HF) molecules. This is because in HF, hydrogen is bonded to fluorine (a highly electronegative atom). The fluorine atom in o…
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activity b (continued from previous page) 5. graph: create a graph show…
s: ### Question 5 A. Negative B. Inversely proportional C. Boyle's Law D. When the chamber is smaller, gas molecules have less space, so they collide with the walls more frequentl…
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earths processes: weathering and erosion unit revie. complete this asse…
It aids in changing the chemical composition of rock.
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in the 19th century, the british had a trade imbalance with china, mean…
- What is opium? Opium is an addictive drug that comes from the poppy plant and is usually smoked. - Why was it valuable to the British? It was valuable because it provided a prod…
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liquid a is known to have a lower vapor pressure and lower surface tens…
- For the first experiment: Eventually both liquids boil, B first and then A. - For the second experiment: \(m_A\) will be less than \(m_B\)
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how can you tell that a chemical change has occurred? when the change o…
2. Gas 3. Precipitate (Solid) 4. Color 5. Light (or Temperature) 6. Color 7. Gas 8. Temperature 9. Odor 10. It is a physical change (mixing, no new substance formed), so it is not…
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21 predict what type of van der waals interactions occur between molecu…
- For \( O_2 \): London dispersion forces. - For \( SCl_2 \): Dipole - dipole interactions and London dispersion forces. - For \( CH_4 \): London dispersion forces.
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identify the physical and chemical changes around us. it’s laundry day!…
(1) Physical Change (2) Chemical Change (3) Chemical Change (4) Chemical Change (5) Physical Change (6) Physical Change (7) Physical Change (For each numbered action, identify as …
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identify the physical (p) and chemical (c) changes around us. you are m…
s: (1) $\boldsymbol{P}$ (2) $\boldsymbol{P}$ (3) $\boldsymbol{P}$ (4) $\boldsymbol{C}$ (5) $\boldsymbol{C}$ (6) $\boldsymbol{C}$ (7) $\boldsymbol{P}$
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a gas occupying a volume of 660.0 ml at a pressure of 0.842 atm is allo…
1080 mL
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the following changes are physical 1. cutting an apple 2. water changes…
(label "Physical" or "Chemical" for each): 1. Physical 2. Physical 3. Physical 4. Chemical 5. Physical 6. Physical 7. Chemical 8. Chemical 9. Physical 10. Chemical 11. Chemical 12…
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5. which is the most common way that water treatment systems are disinf…
C. Using chemicals
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define physical property | define chemical property
- **Define Physical Property**: A property of a substance that can be observed or measured without altering the substance’s chemical composition (e.g., color, density, boiling poi…
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worksheet define physical property\tdefine chemical property for the fo…
1. P - Hardness 2. P - Melting point 3. C - Flammability (burns) 4. P - Malleability 5. P - Luster 6. C - Reacts with air (tarnish) 7. P - Density 8. P - Red color 9. P - Strong s…
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6. provide a brief description for each of the following terms in the b…
All Matter: Anything with mass and volume Pure Substances: Uniform, fixed composition Elements: One type of atom Compounds: Two+ bonded elements Mixtures: Physically combined subs…
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4. a. how can we separate salt from water? include a diagram. p29 heat …
A. Separate salt from water by evaporation: Heat the saltwater solution—water evaporates, leaving solid salt. B. 1. Yes 2. No 3. Liquid to gas
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4. a. how can we separate salt from water? include a diagram. p29 b. in…
30 mL/s
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part iv. use the following diagrams to answer the questions below. 32. …
A, D, E ### Question 33
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18 ccc cause and effect why can molecules made of three atoms have a be…
Triatomic molecules can have a linear or bent shape due to the VSEPR theory. A linear shape occurs when the central atom has 2 bonding pairs and 0 lone pairs (e.g., $\ce{CO_2}$). …
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unknown cₓhᵧoₓ, you burn 0.0400 g of the compound in a combustion analy…
\(\boxed{0.000905}\) (or depending on precise calculation, maybe 0.000904 or similar)
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vitamin c has the formula cₓhᵧo_z. you burn 0.0400 g of the compound in…
\( \boxed{0.00136} \) (assuming the \( CO_2 \) mass is 0.0600 g, and moles of C = moles of \( CO_2 \))
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interactive example molecular formula questions what is the molecular f…
$\mathrm{C_2H_4O_2}$
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interactive example molecular formula vinegar contains carbon, hydrogen…
- mol C/mol vinegar: $\boldsymbol{2}$ - mol H/mol vinegar: $\boldsymbol{4}$ - mol O/mol vinegar: $\boldsymbol{2}$
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chemwork consider separate 1.0-l gaseous samples of ch₄, o₂, and ar, al…
\(CH_4 = O_2 = Ar\) (the first option: \(CH_4 = O_2 = Ar\))
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calculate the mass of sodium hydroxide that must be added to 2.00 l of …
\(\boxed{40.0}\)
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a 0.38 m solution of ammonia was titrated with hydrochloric acid to the…
$\approx 4.93$
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calculate the volume of 1.50 × 10⁻² m naoh that must be added to 500.0 …
$\approx 4.00$
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17 sep use math calculate the electronegativity differences and determi…
- For K - F: Electronegativity difference = 3.16, Bond type: Ionic (highly polar). - For N - O: Electronegativity difference = 0.4, Bond type: Polar covalent (slightly polar).
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to rent a certain meeting room, a college charges a reservation fee of …
The possible amounts of time \( t \) (in hours) for which they could rent the meeting room satisfy the inequality \( 0 < t < 4 \)
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a solution is prepared by mixing 50.0 ml of 0.10 m pb(no₃)₂ with 60.0 m…
\( [\text{Pb}^{2+}] \approx \boldsymbol{7.8 \times 10^{-5} \, \text{M}} \), \( [\text{Cl}^-] \approx \boldsymbol{0.45 \, \text{M}} \) (or more precise \( 0.45 \, \text{M} \) and \…
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the solubility of the ionic compound m₂x₃, having a molar mass of 273 g…
\(\approx4.3\times 10^{-43}\) (or more precisely \(4.29\times 10^{-43}\))
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part iv. use the following diagrams to answer the questions below. a b …
b. is a compound ### Question 38
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16 ccc patterns rank the electronegativity values of lithium, oxygen, p…
The order of electronegativity from lowest to highest is potassium (K) < lithium (Li) < selenium (Se) < oxygen (O). Electronegativity increases across a period (due to decreasing …
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part ii. in the spaces provided, describe the characteristics of the ma…
21. Element - A pure substance with one type of atom, e.g., H, O, Au, can't be chemically broken down. 22. Compound - Pure substance with two+ elements in fixed ratio, e.g., H₂O, …
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part ii. in the spaces provided, describe the characteristics of the ma…
s: 24. Element 25. Mixture 26. Compound (assuming the molecules are of the same type with different atoms) 27. Compound (assuming all molecules are the same with different atoms) …
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14 ccc patterns what is the relationship between the number of electron…
The number of electrons an atom shares in covalent bonds is related to the number of valence electrons it has such that an atom shares electrons to achieve a stable valence electr…
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missed this? watch kcv: reaction stoichiometry; read section 8.3. you c…
9.74×10³ mol
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4.87 × 10³ mol n₂o₅ express your answer using three significant figures…
$4.87 \times 10^3$ mol
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question 7 (2 points) listen what was the independent variable in your …
A. soap
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use the references to access important values if needed for compare the…
- \( 0.10 \, \text{M} \, \text{Zn(NO}_3\text{)}_2 \): Less soluble than in pure water. - \( 0.10 \, \text{M} \, \text{K}_2\text{CO}_3 \): Less soluble than in pure water. - \( 0.1…
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Question was provided via image upload.
Step 1: Almost all organs are taken out of the body. Some are placed in special jars. Step 2: Once the organs are removed, the body is covered in salty chemicals to dry it out. St…
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directions answer the question below to check your understanding and mo…
Not accurate, but precise.
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earths processes: rocks online practice complete this assessment to rev…
They can use diamonds to generate pressures higher than those in Earth's core.
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identify the number of atoms found in the chemical below: mg(no3)2? mag…
- Oxygen atoms: \(6\) - Nitrogen atoms: \(2\) - Magnesium atoms: \(1\)
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identify the number of atoms found in the chemicals below: co2 carbon a…
For \(H_2O\): \(2\) hydrogen atoms and \(1\) oxygen atom. For \(CO_2\): \(1\) carbon atom and \(2\) oxygen atoms.
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compare the solubility of silver sulfite in each of the following aqueo…
- \(0.10\ M\ AgCH_3COO\) → Less soluble than pure water. - \(0.10\ M\ (NH_4)_2SO_3\) → Less soluble than pure water. - \(0.10\ M\ NH_4CH_3COO\) → More soluble than pure water. - \…
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scoring: your score will be based on the number of correct matches minu…
- 0.10 M AgNO₃: Less soluble than pure water - 0.10 M Na₂SO₃: Less soluble than pure water - 0.10 M KCH₃COO: Similar solubility as pure water - 0.10 M NH₄NO₃: More soluble than pu…
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13. name the following compounds: a. $\\ce{n_{2}o}$ b. $\\ce{no_{2}}$ c…
a. dinitrogen monoxide b. nitrogen dioxide c. dinitrogen trioxide d. nitrogen monoxide e. disulfur dichloride f. sulfur dioxide g. disulfur heptoxide h. disulfur monoxide
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choose the best transition. ms. huffman wants to be an astronaut. _____…
For this reason
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what do these two changes have in common? a dinosaur bone turning into …
Both are chemical changes.
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what do these two changes have in common? an engine using gasoline to p…
Both conserve mass., Both are chemical changes.
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question 26 0.5 pts convert the following: 1 microliter (μl) = ______?_…
0.001 (Note: Assuming the option "001" is a formatting error for 0.001, as it is the correct conversion value.)
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what do these two changes have in common? mixing sand and gravel mixing…
Both conserve mass., Both are only physical changes.
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what do these two changes have in common? filtering air to remove dust …
Both are only physical changes.
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what do these two changes have in common? baking cookies deep - frying …
B. Both are caused by heating, C. Both conserve mass, D. Both are chemical changes
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how many moles of pcl₅ can be produced from 59.0 g of cl₂ (and excess p…
0.333 mol
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calculations involving a limiting reactant now consider a situation in …
0.872 mol
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rank the following compounds labelled a to e, in order of decreasing so…
Lead(II) sulfate - 5, Barium carbonate - 4, Barium sulfate - 3, Silver bromide - 2, Cobalt(II) sulfide - 1
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101.7 g of solid nh₄no₃ is heated in a 5.86 l container at 230.°c and t…
\(316.8143\)
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101.7 g of solid nh₄no₃ is heated in a 5.86 l container at 230.°c and t…
\(317.85\)
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Question was provided via image upload.
For \( CO_2 \): \( 1 \) carbon atom and \( 2 \) oxygen atoms. For \( H_2O \): \( 2 \) hydrogen atoms and \( 1 \) oxygen atom.
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for the reaction given below, 2.00 moles of a and 3.00 moles of b are p…
\(4.15\)
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demonstrate understanding 7. explain why it is important that a chemica…
7. Balancing follows conservation of mass (atoms conserved). 8. Color change, gas production, precipitate formation. 9. Skeleton: unbalanced; chemical: balanced (equal atoms). 10.…
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at 25°c, ( k_{sp} ) for calcium fluoride (mm = 78.08 g/mol) is ( 4.0 \t…
\(0.013\)
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question 10 of 10 how does the oxidation state of li change in the foll…
C. It goes from 0 to +1.
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question 9 of 10 which of the following most completely describes a red…
A. An oxidation and reduction reaction
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question 8 of 10 what is the oxidation state of cl in hclo₃? a. -1 b. +…
B. +5
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question 7 of 10 what happens in a reduction? a. an element loses one o…
D. An element gains one or more electrons.
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question 6 of 10 what does it mean for an element to be oxidized? a. th…
C. The element has lost one or more electrons in a reaction.
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question 5 of 10 in the redox reaction agno₃ + na → nano₃ + ag, which e…
D. Silver (Ag)
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nding - problems ck the formula that matches the name shown below. carb…
CS₂
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question 4 of 10 what determines the most likely oxidation state of an …
D. The number of electrons the element needs to lose or gain to have a full valence shell
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question 3 of 10 what is the oxidation state of p in $po_4^{3-}$? a. +2…
C. +5