Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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18. circle the atom in each pair with the larger radius: a) mg or ca b)…
a) Ca b) Si c) Br d) Li 19. P; because atomic radius decreases across a period and P is to the left of S in Period 3. 20. False
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12. this element has an atomic number lower than that of aluminum (al) …
12. Nitrogen (N) 13. Elements in the fourth period (e.g., K, Ca) 14. Noble gases 15. Alkaline earth metals 16. Atomic number 17. Alkali metals 18. 1. Proton; positive; nucleus. 2.…
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4. diagram: turn on show electron dot diagram. the valence electrons of…
Li•
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part d: application 16. arrange the following elements in order of incr…
16. Na, K, Rb, Cs 17. Te, Se, S, O 18a. Ca 18b. Si 18c. Br 18d. Li
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4. diagram: turn on show electron dot diagram. the valence electrons of…
Li•
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3. observe: click reset ( 2 ). the electrons in the outermost orbit, ca…
1
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cer response - vaping directions: follow the directions to complete you…
Evidence: Health experts' reports on vaping - related deaths and sicknesses; presence of dangerous chemicals like nicotine and metal in vape devices. Reasoning: Inhalation of toxi…
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a scientist is determining the mass of 25,000 molecules of oxygen. use …
$1.3\times10^{-18}$ grams
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a scientist is determining the mass of 25,000 molecules of oxygen. use …
2
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3. observe: click reset ( 2 ). the electrons in the outermost orbit, ca…
1
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2. analyze: electrons are arranged in orbits called energy levels. the …
A. 2 B. 8 C. 8
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activity b: electron arrangements get the gizmo ready: create a neutral…
In a hydrogen atom with 1 electron, the electron is in the first energy level (1s orbital). As more electrons are added to atoms of other elements, they fill energy levels and orb…
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4. practice: use the gizmo to answer the following questions. a. how ma…
A. 3 B. 13 C. 12 D. 10 E. 10
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name leilani mendez 9 - 24 - 25 period 8th phet lab build an atom simul…
Protons: mass - 1 amu, charge - +1; Neutrons: mass - 1 amu, charge - 0; Electrons: mass - nearly 0 amu, charge - 1; H: Atomic number 1, Number of P⁺ - 1, Number of N⁰ - 0, Mass Nu…
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9. which of the following explains why atomic radius decreases across a…
9. c) Nuclear charge increases, pulling electrons closer 10. b) Bottom left of the periodic table
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isotope activity for all elements, the number of neutrons can make the …
1. - Lithium - 5: Unstable, too few $N^0$ - Lithium - 6: Stable - Lithium - 7: Stable - Lithium - 8: Unstable, too many $N^0$ 2. - Oxygen - 14: Unstable, too few $N^0$ - Oxygen - …
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section b: you may draw arrows to help you if you want but it is not re…
1. 3Na₂SO₄: - # of molecules: 3 - # of elements: 3 - Name of element: Sodium, Sulfur, Oxygen - # of atoms: 6, 3, 12 - Total # of atoms: 21 - The 3 is a coefficient 2. 2ZnSO₄: - # …
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part b: multiple choice 6. which element has the largest atomic radius?…
6. d) Rb 7. b) F 8. a) Increases 9. None of the given options are correct. The correct reason is that the nuclear charge increases while electrons are added to the same shell.
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lab safety name minion mayhem!!! the minions are trying to practice goo…
- Scenario #1: Did not wear gloves, glasses, or lab - coat and had a food - related slipping hazard. - Scenario #2: Were playing in the lab and did not heed warnings about breakab…
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1. the atomic radius is defined as the distance from the ______ to the …
1. nucleus; outermost part 2. increases 3. decreases 4. protons 5. electron shells
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name: nolan joscakz date: word **** counting atoms practice **** use yo…
1) coefficient: 3, subscript for Mg: 1, subscript for Cl: 2 2) coefficient: 1, subscript for V: 2, subscript for O: 5 3) coefficient: 4, subscript for K: 2, subscript for C: 1, su…
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3. each box has 2 isotopes of the same element. fill in the isotope nam…
| Isotope Name | Mass Number | Atomic Number | # of \(P^+\) | # of \(e^-\) | # of \(N\) | Full Nuclear Notation | |---|---|---|---|---|---|---| | Manganese - 42 | 42 | 25 | 25 | 2…
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prompt write a scientific explanation that identifies the variables tha…
The variables that affect the rate of dissolution of a solid are temperature, surface - area of the solid, stirring/agitation, and the nature of the solvent and solute.
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activity a: subatomic particles get the gizmo ready: • use the arrows t…
A. The atomic number ($Z$) is equal to the number of protons in the atom. B. $N = A - Z$ C. Positive charge: proton; Negative charge: electron; No charge at all: neutron
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snowball had made a close study of some back numbers of the “farmer and…
- Napoleon does not make any plans of his own. - Napoleon says that the improvements will never happen. - Napoleon seems to be waiting for Snowball's plans to fail.
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2. a student attempts to identify an unknown compound by using chemical…
a. It is a hydrogen carbonate because there is a mass - loss on heating, which is characteristic of the decomposition of a hydrogen carbonate to a carbonate, water, and carbon dio…
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gizmo warm - up atoms are tiny particles of matter that are made up of …
A. Protons and neutrons B. Electrons 2. The number of protons in the nucleus
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at what times should a ph electrode be submerged in a solution? select …
B. When monitoring a reaction in a beaker
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when using a ph meter to monitor a stirring reaction mixture, where sho…
A. Between the stirring vortex and the side of the glassware
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when taking ph measurements of solutions, why is it important to stir t…
Mixing helps ensure that the measured pH is reflective of the entire solution.
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study guide • proton (+): in nucleus. • neutron (0): in nucleus. • elec…
2. c) Electron 3. - 4. Nucleus → Holds protons + neutrons; Electron cloud → Holds electrons 5. The number of protons is unique to each element and is called the atomic number whic…
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vocabulary: atom, atomic number, electron, electron dot diagram, elemen…
1. Flour, cheese, tomato sauce, meats, vegetables. 2. Hydrogen and oxygen. 3. Iron (and sometimes other alloying elements like carbon).
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select the missing words to complete the definition of buffer capacity.…
First blank: moles Second blank: range
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select the missing words to complete the definition of buffer capacity.…
First blank: amount; Second blank: pH
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determine whether or not each combination of substances can be used to …
0.4 M KOH, 0.2 M NaOH: No 0.1 M HCl, 0.1 M KCl: No 1 M Na₂HPO₄, 1 M NaH₂PO₄: Yes 0.05 M HNO₂, 0.05 M NaNO₂: Yes 0.1 M HNO₂, 0.05 M NaOH: Yes
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use the $k_a$ values for weak acids to identify the best components for…
$pH = 3.9$: formic acid ($HCOOH$) $pH = 1.9$: phosphoric acid ($H_3PO_4$) $pH = 5.0$: acetic acid ($CH_3COOH$)
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study guide democritus: first idea of atoms. dalton: atoms are indivisi…
1. Democritus, Dalton, Thomson, Rutherford, Bohr 2. Plum pudding model → Thomson; Electrons in orbits → Bohr; Atoms indivisible → Dalton 3. c) Rutherford 4. orbits 5. Rutherford u…
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4. sorting: place in correct column (pure substance vs. mixture): gold,…
4. Pure Substances: A. Gold, B. Oxygen; Mixture: a. Kool - Aid, b. Granite 5. atom 6. Compounds have a fixed ratio of elements chemically combined, while mixtures have substances …
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4. sorting: place in correct column (pure substance vs. mixture): gold,…
b) Gravity pulls objects down 2. **Fill - in - the - Blank**:
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during the process of anaerobic digestion, animal waste produces methan…
D. Readers would not typically link the Department of Energy with animal waste research.
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why are hydrocarbons insoluble in water? the majority of their bonds ar…
The majority of their bonds are nonpolar covalent carbon - to - hydrogen linkages.
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thomas constructs a model by completing the following steps. 1. draw a …
A. biogeochemical cycle
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what is the name of the functional group shown in the image? hydroxyl c…
B. carboxyl
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which of the atoms shown would most likely to form a cation with a char…
The atom with 1 valence electron (the one where there is only 1 dot in the outermost electron - shell diagram)
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topic 2: mixtures and separation study guide - mixture: combination of …
1. a) Filtration 2. homogeneous 3. Salt water, Kool - Aid 4. Coffee filter → Filtration; Evaporation dish → Evaporation 5. Oil and water are both liquids and both can pass through…
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bacl₂ + h₂so₄ → baso₄ + hcl ba= cl= h= s= o= ba= cl= h= s= o=
1 $BaCl_2$ + 1 $H_2SO_4$ $ ightarrow$ 1 $BaSO_4$ + 2 $HCl$
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the image shows a power plant and a lewis structure of the chemical eth…
angle = 109°, geometry = trigonal pyramidal
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the image shows tubes of glue and a lewis structure for methyl cyanoacr…
One carbon atom
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nitrogen trifluoride used in the manufacture of microelectronics the im…
6 pairs
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read the experiment below and answer the next four questions. a scienti…
C. Starting mass of the rocks
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the majority of chemical digestion occurs where in the digestive system…
C. Small intestine
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how many carbons are in the epibatidine molecule? 11 are there any pola…
How many carbons are in the epibatidine molecule? Answer: 11 Are there any polar covalent bonds in epibatidine? Answer: Yes If you said there are polar bonds, which bond(s)? Answe…
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the major differences between the states of matter of water are _______…
the motion of the particles, the distance between the particles
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are there any polar covalent bonds in epibatidine? yes no
Yes
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in the gas state, water vapor molecules are _______________. check the …
very far apart, moving very quickly
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how many carbons are in the epibatidine molecule? your answer
11
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atoms, elements, and compounds madelyn roque multiple - choice question…
The mass of the starting substances.
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ph testing ph is one of the most common variables looked at in water te…
Los niveles de pH demasiado altos o bajos afectan la supervivencia y bien - estar de los organismos acuáticos, causando daño a membranas celulares, branquias, esqueletos, alterand…
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which one of the following is most likely to be an ionic compound? a nc…
1. C. \(BaCl_2\) 2. B. Br
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which one of the following is most likely to be an ionic compound? a cl…
For the first question: B. FeCl₃ For the second question: A. CaCl₂
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for problems 22 - 25, large amounts of nitrogen are used by the electro…
22. I 23. E 24. I 25. I 26. I 27. I 28. E
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write correct formulas of the compounds formed when the positive ions i…
| | carbonate | hydroxide | nitrate | oxide | phosphate | sulphite | |--|--|--|--|--|--|--| | aluminum | $Al_{2}(CO_{3})_{3}$ | $Al(OH)_{3}$ | $Al(NO_{3})_{3}$ | $Al_{2}O_{3}$ | $…
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b) calculate the average mass of each bead isotope (show your calculati…
$8.10$ g
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test v: write the correct atomic number in each block, then color them …
46. Gold (Au) 47. Silicon (Si) 48. Copper (Cu) 49. Oxygen (O) 50. Sodium (Na) 51. Chlorine (Cl) 52. Mercury (Hg) 53. Carbon (C) 54. Lithium (Li) 55. Nickel (Ni)
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test v: write the correct atomic number in each block, then color them …
46. Gold (Au) 47. Silicon (Si) 48. Oxygen (O) 49. Chlorine (Cl) 50. Sodium (Na) 51. Mercury (Hg) 52. Carbon (C) 53. Lithium (Li) 54. Copper (Cu) 55. Nickel (Ni)
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two oxygen atoms. use the energy and bond formation simulation (link pr…
The answer would be obtained by performing the simulation steps as described, recording the minimum potential energy for hydrogen and oxygen respectively, and then comparing these…
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1. write the names and formulas of two common acids and two common base…
Acids: Hydrochloric acid ($HCl(aq)$), Sulfuric acid ($H_2SO_4(aq)$); Bases: Sodium hydroxide ($NaOH(aq)$), Calcium hydroxide ($Ca(OH)_2(aq)$) ### 2. | Characteristic | Acids | Bas…
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question 11. the element in group 15, period 5, of the periodic table i…
C. metalloid
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general directions: read the instructions carefully in every test and w…
Test I: 1. Period 5, Group 1 2. Period 4, Group 4 3. Period 6, Group 11 4. Period 5, Group 17 5. Period 5, Group 13 6. Period 6, Group 8 7. Period 4, Group 13 8. Period 2, Group 1…
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which statement explains why the bonds between nonmetals tend to be cov…
They have small differences in electronegativity.
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write the electron configuration for the following elements. (ex. na = …
Si: 1s²2s²2p⁶3s²3p² Cr: 1s²2s²2p⁶3s²3p⁶4s¹3d⁵ Ba: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s² Br: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵
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the compound fecl₃ is made of three molecules of iron chloride. one ato…
C. one atom of iron and three atoms of chlorine.
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what is the formula equation for the reaction between sulfuric acid and…
C. $\mathrm{H_2SO_4}(aq)+ 2\mathrm{NaOH}(aq) ightarrow\mathrm{Na_2SO_4}(aq)+ 2\mathrm{H_2O}(l)$
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which formula equation represents the burning of sulfur to produce sulf…
A. $S(s)+O_2(g)\xrightarrow{\Delta}SO_2(g)$
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consider the unbalanced equation for the oxidation of butene. c4h8 + 6o…
B. four carbon dioxide molecules and four water molecules
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the compound co₂ is made of two atoms of cobalt. one atom of cobalt and…
E. one atom of carbon and two atoms of oxygen.
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question 10. complete the table below by classifying each element as a …
| Element | Metal, Metalloid, or Nonmetal | Group Name | | ---- | ---- | ---- | | Magnesium (Mg) | Metal | Alkaline - earth metals | | Chlorine (Cl) | Nonmetal | Halogens | | Zirc…
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how is electronegativity related to covalent bonding? atoms must have s…
Atoms must have similar electronegativities in order to share electrons in a covalent bond.
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this formula equation is unbalanced. p4(s) + 6cl2(g) → pcl3(l) which co…
C. 4
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the chemical equation for the formation of ammonia is unbalanced. 3h₂(g…
B. 2
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which type of substances have chemical bonds that are not directional a…
C. metals
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7. give the systematic name for each of the following molecules. (1 mar…
a. 1 - chloro - propane b. 2 - chloro - propane c. 1 - fluoro - propane d. 2 - chloro - butane
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question 9. identify the group name for each element listed below. a) c…
a) Alkaline - Earth Metals b) Noble Gases c) Halogens d) Transition Metals e) Alkali Metals f) Transition Metals g) Noble Gases h) Actinides i) Lanthanides j) Halogens
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consider the positions of carbon, nitrogen, potassium, and calcium on t…
C. nitrogen (N)
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which statement describes how the bond between two oxygen atoms is form…
by sharing valence electrons between the two atoms
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which statement best describes the formula equation cl₂(g) + 2kbr(aq) →…
D. Chlorine gas reacts with potassium bromide to form potassium chloride in solution and liquid bromine.
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which word equation shows hydrogen reacting with oxygen to form water? …
hydrogen + oxygen → water
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what is the word equation for atoms of magnesium reacting with molecule…
B. magnesium + oxygen → magnesium oxide
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which of these is a property of a substance that is composed of atoms t…
It conducts electricity when it is dissolved in water.
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the incomplete table below shows selected properties of compounds that …
B. silver (Ag)
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question 8. in the periodic table below, label each identified group. 1…
From left - to - right (starting from the top - left labels): Alkali Metals Alkaline Earth Metals Transition Metals Halogens Noble Gases Lanthanides Actinides
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question 7. which list represents the classification of the elements ni…
Nonmetal, noble gas, metal, metalloid
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question 6. which group of elements contains a metalloid? group 2 group…
C. Group 16
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question 5. select all the properties that apply to nonmetals. dull app…
Dull appearance, Poor conductors of electricity, Brittle when solid
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consider the chemical equation for the combustion of sugar. _c6h12o6(s)…
1. 1, 6, 6, 6
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question 4. select all the properties that apply to metals. brittle whe…
High melting point, Malleable and ductile, Shiny (lustrous) appearance, Good conductors of electricity
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row bond cause physical property of compound 1 ? electron sharing among…
C. metallic
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question 3. classify the elements below as metals, nonmetals, or metall…
a) Metal b) Nonmetal c) Metalloid d) Metal e) Nonmetal f) Metal g) Metalloid h) Metal
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this formula equation is unbalanced. pb(no₃)₂(aq) + li₂so₄(aq) → pbso₄(…
B. 2
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which symbol can be used to indicate a chemical reaction that takes pla…
Pt