Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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sodium - na how many protons? how many electrons? draw the electron orb…
### Sodium (Na) section: 1. How many electrons? $\boldsymbol{11}$ 2. How many electrons are in the outer energy level? $\boldsymbol{1}$ 3. This is called the $\boldsymbol{\text{Le…
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3. what qualities does the song suggest would make jackson a good presi…
The song suggests qualities like **alertness** (from "Jackson, he was wide awake"), **fearlessness toward trivial matters** (from "wasn’t scared of trifles"), **military/strategic…
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how many grams of f₂ are needed to produce 89 grams of fef₃?
Approximately 45 grams (or more precisely around 44.97 grams) of \( \text{F}_2 \) are needed.
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how many neutrons are there in cesium cesium-131 has a mass number of 1…
76 (corresponding to the option with value 76)
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beryllium (be) has an atomic number of 4 and an average atomic mass of …
5
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multiple-choice question what is the overall charge of \\(\\ce{_3^7li}\…
0
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how many protons are in calcium (ca); atomic number = 20; average atomi…
20
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determine the number of electrons in \\(\\ce{_{29}^{63}cu}\\)
29
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read the lyrics of this folk song, which was written in 1821 by samuel …
Two adjectives describing the song’s mood are "spirited" and "confident".
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use the answer bank to create a molecular diagram and identify the mole…
Molecular diagram: A central C atom bonded to 4 Br atoms, no lone pairs on C. Molecular Shape: Tetrahedral
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initial knowledge check question 10 a chemical technician measured the …
| Temperature (in °C) | Relative Frequency | |---|---| | 95 to 100 | 0.22 | | 101 to 106 | 0.17 | | 107 to 112 | 0.28 | | 113 to 118 | 0.33 |
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multiple-choice question a negatively charged atom is the result of ...…
more electrons than protons
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if you know the mass # and the # of protons, how can you calculate the …
take the mass number and subtract the number of protons
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what do you use to determine which element you are working with? □ char…
atomic #
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doth still persist in her rebellious pride and love not like to lusts o…
s (filling the blanks): 1. The sonnet is written in the **Petrarchan (or English) sonnet** form (commonly, English sonnet is also called Shakespearean, but Petrarchan has 14 lines…
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grammar passage plastic pollution is globally distributed across all oc…
D. , ranging from zooplankton to whales, seabirds, and marine reptiles,
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write the chemical symbols for three different atomic cations that all …
$\text{Ti}^{2+}$, $\text{Ti}^{3+}$, $\text{Ti}^{4+}$
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write the empirical formula for at least four ionic compounds that coul…
\( \text{Pb(SO}_4\text{)}_2 \), \( \text{Pb(CH}_3\text{CO}_2\text{)}_4 \), \( (\text{NH}_4\text{)}_2\text{SO}_4 \), \( \text{NH}_4\text{CH}_3\text{CO}_2 \) (Other valid combinatio…
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complete the table below by writing the symbols for the cation and anio…
| Ionic Compound | Cation | Anion | | ---- | ---- | ---- | | $\text{AgBr}$ | $\text{Ag}^+$ | $\text{Br}^-$ | | $\text{Cr}_2\text{S}_3$ | $\text{Cr}^{3+}$ | $\text{S}^{2-}$ | | $\t…
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question 1 points 1 what isotope of phosphorous is not radioactive? pho…
B. Phosphorus - 31
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question 7 points 2 which method can a student use to compare an unknow…
B. Measure boiling point or density
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the student measured the distance between points 6 and 5, the top edge …
\(0.68\)
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name: teacher: date: q3 chemistry: u5l2 vsepr theory day 1 for each com…
To solve this problem, we will analyze each molecule one by one, determining the Lewis Dot Diagram, Compound Name, and 3 - D Shape Name & Angle using VSEPR theory. ### Molecule: \…
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weathering and erosion guided notes name_______________ hour____ - resi…
s: - Resistant rocks can form \(\boldsymbol{\text{buttes}}\) or ridges. - Example: \(\boldsymbol{\text{Devils}}\) Tower in Wyoming. - Climate is the average \(\boldsymbol{\text{te…
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prepwork part 1: vsepr shape practice part 1: multiple choice questions…
A. Valence Shell Electron Pair Repulsion #### Question 2
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weathering and erosion guided notes - ______ animals break rock apart. …
1. Burrowing 2. roads 3. chemical 4. composition 5. new 6. unstable 7. Water 8. carbonic 9. increases 10. oxidation 11. rust 12. nutrients 13. carbon 14. increase 15. Hard (or Int…
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the graph compares the rates of reaction of a burning candle and an exp…
The reaction that causes a firework to explode requires less energy to start, and occurs more rapidly than the reaction that causes a candle to burn.
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electromagnetic waves from the sun include visible light, ultraviolet, …
C. The atmosphere contains molecules that absorb specific wavelengths based on their atomic structure
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write the equation for heat transfer for melting/freezing phase change …
1. Heat Transfer for Melting/Freezing Phase Change: Equation: $Q = m \cdot L_f$ Variable Definitions: - $Q$: The total heat transferred during the phase change (units: joules, J) …
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type the correct answer in the box. tungsten carbide is becoming popula…
94
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select the correct answer. a 520 - gram sample of seawater contains 0.3…
C. 3.6%
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select the correct answer from each drop - down menu. what are the perc…
73.2%
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4. if the mass of an object is 150 grams and its volume is 50 cm³, what…
$3\ \text{g/cm}^3$
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select the correct answer from each drop - down menu. what are the perc…
Percent composition of vanadium: 10.8% (For lead, if we assume the total mass is 135 + 915 = 1050, then percent Pb is 915/1050 *100≈87.1%, no. Wait maybe the ore's mass is 135 + 9…
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17. ______ is an educated guess or prediction about the outcome of the …
17. d) A hypothesis 18. c) graph 19. d) Hypothesis 20. d) close-toed shoes, gloves, apron 21. d) holding liquid 22. d) To inform you of hazards 23. a) No 24. c) Open flames 25. c)…
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select all the correct answers. which compounds have the empirical form…
The compounds with the empirical formula \( CH_2O \) are: - \( C_2H_4O_2 \) - \( C_3H_6O_3 \) - \( C_5H_{10}O_5 \) - \( C_6H_{12}O_6 \)
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1 true or false: density is a measure of how much mass is contained in …
True
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properties of matter foldable instructions types of matter: draw the tr…
1. Types of Matter Tree: ``` Matter ├─ Pure Substances │ ├─ Elements │ └─ Compounds └─ Mixtures ├─ Homogeneous └─ Heterogeneous ``` 2. Phase Change Diagram: (Conceptual) - Y-axis:…
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two military options of the u.s. government to end world war ii option …
D. atomic bombs
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chapter 15 heat transfer and cooking methods exam accomodated matching …
s: 1. N. radiation 2. B. broiling 3. F. convection 4. L. mechanical convection 5. H. fond 6. M. microwave radiation 7. G. denaturation 8. I. grilling 9. E. conduction 10. A. broil…
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4) water is a major agent of chemical weathering because water (1) cool…
4) (4) dissolves many of the minerals that make up rocks 5) (4) weathering and erosion 6) (1) type of bedrock material 7) (2) bedrock composition and climate 8) (4) greater precip…
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the table shows the densities of four solid objects in grams per millil…
### Floats in the corn syrup sample: foam lid, wooden bead, six-sided die ### Sinks in the corn syrup sample: gold ring
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at 25°c, a grape has a density of 1.08 grams per milliliter, and a corn…
The grape will float on the surface of the corn syrup.
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at 25°c, a vegetable oil sample has a density of 0.92 grams per millili…
The vegetable oil will float on the water.
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devon adds milk to a beaker of molasses. after the liquids settle, this…
floats on the surface of . . . less
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fe₂o₃ → fe + o₂
The balanced equation is $\ce{2Fe_{2}O_{3} -> 4Fe + 3O_{2}}$, so the coefficients are 2 (for $\ce{Fe_{2}O_{3}}$), 4 (for Fe), and 3 (for $\ce{O_{2}}$). If using moles, for example…
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darrell adds water to a beaker of kerosene. after the liquids settle, t…
sinks below . . . more
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caitlyn is learning about a type of energy that is stored in batteries.…
D. chemical energy
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amount of the substance changes. this is because characteristic propert…
- Because the temperature in Sam's kitchen is higher than the melting point of the coconut oil, the coconut oil is a liquid. - A substance's melting point is higher when the attra…
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different physical and chemical properties. when a substance is a react…
A. A substance's chemical structure affects its properties. B. A chemical change occurs during saponification.
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chapter 18 heat transfer and cooking methods exam accommodation matchin…
N. radiation ### Question 2
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which process is a chemical change? burning a match boiling water melti…
A. burning a match
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where are nonmetals located in the periodic table? periodic table of el…
Nonmetals are located on the right side of the periodic table, including hydrogen in the top left corner, and the noble gases in the far right column.
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chapter 15 heat transfer and cooking methods exam accommodation matchin…
N. radiation ### Question 2
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which statement best describes the difference between a physical change…
A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.
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what is the correct formula for iron (iii) sulfate * fe(so4) fe2(so4)3 …
B. $\text{Fe}_2(\text{SO}_4)_3$ ### Second Question: What is the correct formula for Copper (II) fluoride?
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what is the correct formula for aluminum cyanide * al3cn al2(cn)3 alcn3…
D. \( \text{Al(CN)}_3 \) (assuming the options are labeled as A: Al3CN, B: Al2(CN)3, C: AlCN3, D: Al(CN)3) ### Second Question: Correct formula for Magnesium acetate
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what is the correct formula for sodium phosphate? * na(po4)3 na4po na3(…
C. $\text{Na}_3(\text{PO}_4)$ (assuming the options are labeled as A. $\text{Na(PO}_4\text{)}_3$, B. $\text{Na}_4\text{PO}$, C. $\text{Na}_3(\text{PO}_4)$, D. $\text{Na}_2(\text{P…
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sneakers, trainers, runners—whatever one calls these popular shoes—thei…
C. It introduces the topic by highlighting the various names for athletic shoes, setting the stage for a historical overview. (Note: Assuming the options are labeled A, B, C in or…
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small bubbles of carbon dioxide are what give soda water its ______. 1 …
1. effervescence
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unit 6 stoichiometry name: show all work for credit including labeling …
1. $\boldsymbol{1054.00}$ moles of NO 2. $\boldsymbol{20.00}$ moles of $CO_2$ 3. $\boldsymbol{0.19}$ moles of $H_2$ 4. $\boldsymbol{29.00}$ liters of $CO_2$
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read the following excerpt from levitt and dubner’s freakonomics. drivi…
B. Feldman's payment system was largely successful
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if morality represents the way we would like the world to work and econ…
D. to lend credibility and additional support to their conclusion
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ionic covalent metallic drag one picture and one definition to each of …
- Ionic: Drag the diagram with electron transfer (the one labeled with Before and After showing electron transfer to form ions) and the "Transfer electrons" definition. - Covalent…
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selections 1 and 2 selection 1: the architect of possibility visionary …
B. transformed fear into strength through the art of language ### Question 2 (Note: The last option in question 2 is cut off, but we analyze the visible options and the author's p…
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the formula used to convert a temperature from degrees fahrenheit (°f) …
A. $-40^\circ$
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which sphere is involved in the carbon biogeochemical cycle? atmosphere…
E. All of the above
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question 10 in what field to scientists study the processes that change…
geochemistry
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question 9 1 pts which is false about the atmosphere? it helps keep the…
Question 9: It is composed of 78% oxygen and 21% nitrogen. Question 10: geochemistry
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what subspecialty of earth science studies patterns of weather over a l…
B. climatology
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3. how many moles is 3.14×10²⁴ atoms of gold?\ \\(\\frac{196.966}{3.14}…
Approximately \( 5.21 \) moles (or more precisely, using \( 6.022 \times 10^{23} \): \( \frac{3.14 \times 10^{24}}{6.022 \times 10^{23}} \approx 5.21 \) moles) ### Question 4: How…
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periodic table: geography: name alina p. date complete this chart about…
To complete the chart, we use the periodic table's properties (group, period, block, state, metal/non - metal/metalloid, special group) for each element: ### Radon - **Group #**: …
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unit 6 short answer ****make sure that your name is on this page. rip i…
Balanced Reaction: $\boldsymbol{C_5H_{12}(l) + 8O_2(g) ightarrow 5CO_2(g) + 6H_2O(g)}$ Type of Reaction: Combustion ### Question 28: Calcium hydroxide and sodium phosphate react..…
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unit test unit test review active 1 2 3 4 5 6 7 8 9 10 in the diagram b…
equilibrium.
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part 3: classify each as physical property (a) or chemical property (b)…
a #### 14. Silver will tarnish in air.
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a particulate model for chemistry is a representation of atoms, ions, o…
B. $\text{AgNO}_3 + \text{NaCl} ightarrow \text{AgCl} + \text{NaNO}_3$ (represented by the particulate model of AgNO₃ + NaCl reacting to form AgCl + NaNO₃)
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counting unit in chemistry, and the mass of one mole of a substance is …
B. $\frac{5.0\ \text{g}}{56\ \text{g/mol}}$
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unit 6 test multiple choice part 1: classify each type of reaction as s…
b. Double Replacement #### Question 2
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a. single replacement c. synthesis/combination e. combustion b. double …
a. Single Replacement ### Question 6
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unit 7 review - chemical formulas and chemical compounds 1. ____ in a s…
1. (c) the charge on each Fe ion. 2. (c) changes the formula so that it no longer represents the compound it previously represented. 3. a. 4 b. 6 c. 21 d. $4.2 \times 10^{24}$ 4. …
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question #1 carmen would like to learn about the history and origins of…
religion
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the structure of the compound or molecule helps predict the name of com…
B. The two nonmetals indicate that covalent naming rules apply.
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which compound is an example of a binary ionic compound? a h₂o b h₂so₄ …
C. $\text{MgF}_2$
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what is the chemical formula for the ionic compound calcium chloride? a…
B. $\text{CaCl}_2$
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experiment 3 pt.1, & pt.2: worksheet q.10 what does a clear or transpar…
B. No precipitate is present
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what gas is evolved when acid (h⁺) is added to either carbonate or bica…
D. Carbon dioxide
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the calcium ion can be identified by the formation of calcium oxalate, …
A. White
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what is the chemical formula for aluminum fluoride? a $\\ce{al_{3}f}$ b…
B. $\text{AlF}_3$
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what is the correct name for the ionic compound, mgcl₂? a manganese chl…
B. magnesium chloride
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name this compound according to iupac nomenclature rules. a nitrogen ox…
C. nitrogen monoxide
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using the equation c₁₂h₂₂o₁₁ + 12o₂ -> 12co₂ + 11h₂o if 156 l of o₂ at …
0.580 mol
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match the following polyatomic ions to their names drag and drop option…
- $PO_4^{3-}$ = phosphate - $SO_4^{2-}$ = sulfate - $CO_3^{2-}$ = carbonate - $HCO_3^-$ = bicarbonate
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this is the chemical formula for nitrogen gas. this is the chemical for…
This is the chemical formula for nitrogen gas. → $\text{N}_2$ This is the chemical formula for hydrogen gas, which is highly flammable. → $\text{H}_2$ This is the chemical formula…
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which color indicates the presence of fe³⁺ when it reacts with thiocyan…
B. Blood red
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which color indicates the presence of potassium ions in a flame test? a…
D. Violet
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which of the following is not an indication of a positive test for a pa…
D. The solution retains clarity
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what happens when you add a drop of water containing silver nitrate to …
A. If chloride is present, a white solid will appear.
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what can one deduce from the reaction of chloride, bromide and iodide i…
A. If a cream - colored solid appears, bromide is present.
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which of these statements accurately describes the ions formed when ato…
C. Metals generally form cations that carry a positive charge as they lose electrons.
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elements are organized on the periodic table based on their properties.…
Calcium (Ca) is less reactive than potassium (K) because potassium atoms must lose more electrons.