Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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how was the work of newlands similar to that of mendeleev on the period…
They both arranged the elements in order of increasing atomic mass.
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how did moseley establish a more accurate periodic table? by arranging …
by arranging the elements according to atomic number instead of atomic mass
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which element is classified as a noble gas? o o o n o cl o xe
Xe.
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which is another name for groups of elements? actinides families haloge…
B. families
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which scientist established the law of octaves? antoine lavoisier dmitr…
D. John Newlands
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how did the work of dmitri mendeleev differ from that of john newlands …
Mendeleev predicted elements that would later be discovered.
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use the periodic table to select the element that best fits each of the…
Which element below is least reactive? Iodine Which element below must be stored in oil because of its reactivity? Calcium
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use the periodic table to select the element that best fits each of the…
chromium, calcium, osmium
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use the periodic table to select the element that best fits each of the…
1. nickel chloride 2. nitrogen and phosphorus
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use the periodic table to select the element that best fits each of the…
B. nickel chloride
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use the periodic table to select the element that best fits each of the…
1. Which element below has properties of both metals and nonmetals? Boron 2. Which element below is the most reactive? Chlorine
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use the periodic table to select the element that best fits each of the…
D. boron
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use the periodic table to select the element that best fits each of the…
Metalloid (semimetal): germanium Lanthanide: promethium
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use the periodic table to select the element that best fits each of the…
germanium
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use the periodic table to select the element that best fits each of the…
Noble gas: krypton A group 5A element: arsenic
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use the periodic table to select the element that best fits each of the…
C. krypton
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use the periodic table to select the element that best fits each of the…
Alkali metal: lithium Halogen: fluorine
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use the periodic table to select the element that best fits each of the…
C. lithium
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what is the correct chronological order of scientists contributing to t…
1. B. Lavoisier, Dobereiner, Newlands, Mendeleev, and Moseley 2. B. atomic mass
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what is an alloy? give an example. type your answer here open - ended q…
# Breve explicación: Un aleación es una mezcla homogénea de dos o más metales, o un metal y otro elemento, formada a altas temperaturas. Esto se hace para mejorar las propiedades …
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question 4 1 pts convert a density of 9.45 g/l to its equivalent in g/m…
0.00945
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question 2 1 pts directions for a lab require heating a reactant to a t…
$90.45$
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from the options provided for each element below, choose the properties…
Nickel (Ni): forms colorful compounds Neon (Ne): a gas
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from the options provided for each element below, choose the properties…
forms colorful compounds
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open - ended question what chemicals did egyptians use to paint the mur…
Los egipcios usaban pigmentos naturales como yeso, óxido de hierro, azurita y realgar, mezclados con un ligante como harina o huevo.
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from the options provided for each element below, choose the properties…
Magnesium (Mg): less reactive than sodium Fluorine (F): highly reactive nonmetal
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from the options provided for each element below, choose the properties…
less reactive than sodium
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the nonmetals include which of the following groups? use the periodic t…
- halogens - noble gases
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use the periodic table to classify each of the elements below. cadmium …
cadmium (Cd): Metal vanadium (V): Metal xenon (Xe): Non - metal iodine (I): Non - metal potassium (K): Metal strontium (Sr): Metal
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use the periodic table to choose the element that matches each descript…
halogen: One of F, Cl, Br, I, At group IIA: One of Be, Mg, Ca, Sr, Ba, Ra nonreactive: One of He, Ne, Ar, Kr, Xe, Rn alkali metal: One of Li, Na, K, Rb, Cs, Fr
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use the periodic table to identify each of the elements below as an alk…
Rb: alkali metal Mg: alkaline earth metal Ca: alkaline earth metal Cs: alkali metal
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open - ended question what was the first discovery, result of chemical …
# Breve explicación: Los primeros humanos experimentaron con la quema de materiales orgánicos, lo que es un ejemplo de reacción química. La combustión es una reacción química en l…
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use the periodic table to identify each of the elements below as an alk…
Rb: alkali metal Mg: alkaline earth metal Ca: alkaline earth metal
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use the periodic table to identify each of the elements below as an alk…
Rb: alkali metal Ca: alkaline earth metal
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use the periodic table to identify each of the elements below as an alk…
alkali metal
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which of these elements are you least likely to find in nature as a pur…
D. sodium (Na)
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use the periodic table to identify the name or atomic number for each e…
hafnium: 72 phosphorus: 15 rhodium: 45 osmium: 76 magnesium: 12
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use the periodic table to identify the chemical symbol or name for each…
zirconium: Zr rhenium: Re As: arsenic K: potassium tin: Sn yttrium: Y Yb: ytterbium
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from the list below, choose which groups are part of the periodic table…
metals, nonmetals, semimetals
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select the correct scientist for each of the following advances in crea…
Identified triads of elements with similar properties: Döbereiner Organized elements according to increasing atomic mass: Mendeleev
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select the correct scientist for each of the following advances in crea…
1. Johann Wolfgang Döbereiner 2. John Newlands 3. Henry Moseley
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why did mendeleev leave blank spaces in his version of the periodic tab…
Mendeleev’s periodic table arranged elements in order of increasing atomic mass; it was noticed that chemical properties repeated. Mendeleev predicted an element had not been disc…
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5. how does victor describe his childhood and early interests? a. troub…
5. C. Idyllic childhood with a fascination for science and alchemy. 6. A. Victor is drawn to science, Henry to chivalry and moral questions. 7. C. He moves from ancient alchemy to…
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which of the following did antoine lavoisier correctly characterize as …
1. C. mercury 2. A. light
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what block does sodium belong to?
s - block
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how many orbital blocks are represented in this periodic table? done
4
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room temperature is around 25°c. what is the state of matter of bromine?
Liquid
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what is silicon used for? matches gunpowder glass steel can coating
glass
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use the periodic table in the tools bar to answer the following questio…
The elemental classification of oxygen is nonmetal. The boiling point of gold is 2970 °C.
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use the periodic table in the tools bar to answer the following questio…
Non - metal
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nitrogen dioxide is a gas that can be generated by emissions from vehic…
D. A brown gas is produced.
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students mixed two liquids in a beaker and listed their observations. l…
D. The two liquids form a new substance.
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exercise 3: chemical reactions in aqueous solutions directions: downloa…
1a. Products: \(AgBr(s)+NaNO_3(aq)\), Precipitate: \(AgBr\), Spectator ions: \(Na^+\), \(NO_3^-\), Net ionic equation: \(Ag^+(aq)+Br^-(aq) ightarrow AgBr(s)\) 1b. Products: \(Zn_3…
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part 4 - particle model diagrams (10 minutes) instructions: working at …
- Review your model of Element. Explain, in terms of atoms, why your model represents an element. This model is an element because it contains only one - type of atom. - Review yo…
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instructions: based on the text regarding dalton and jj thomson, work w…
**Dalton’s Atomic Theory - Unique Details**: Atoms are solid, indivisible spheres; atoms of different elements have different masses. **JJ Thomson’s Atomic Theory - Unique Details…
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a scientist is working with methane (ch₄) and butane (c₄h₁₀). which sta…
They are compounds made of the same two elements, but each contain different numbers of atoms.
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coordinating conjunctions complete the sentences using the coordinating…
1. but 2. and 3. or 4. so 5. for 6. nor 7. and 8. for 9. so 10. but 11. or 12. nor 13. but 14. for 15. and 16. so 17. or 18. but 19. nor 20. for 21. nor 22. so
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which statement explains why hydrogen bonds are able to form between wa…
Water molecules are polar.
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what are indicators? chemical compounds used to detect the presence of …
chemical compounds used to detect the presence of other compounds
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sep use models choose an element from the periodic table. describe all …
For an element like hydrogen (H) from the periodic table, we can learn its symbol (H), atomic number (1), group number (1), and that it has a single electron in its out - most she…
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metals, nonmetals, and metalloids elements are broadly classified as me…
Semiconductors are likely to be found in the area of the periodic table where metalloids are located, in a zig - zag pattern between metals and nonmetals. This is because metalloi…
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16. provide 3 missing symbols and 2 numbers 16 n + 4 2 → 9 + 1 0
The three missing symbols are \(_{7}\), \(_{2}\), \(_{3}\); the two missing numbers are 7, 3.
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question 1 mark this question meredith created organic soaps and lotion…
D. Point - of - sale terminal
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element write the noble gas notation electron configurations noble gas …
Krypton: \([Ar]3d^{10}4s^{2}4p^{6}\) Silver: \([Kr]4d^{10}5s^{1}\) Selenium: \([Ar]3d^{10}4s^{2}4p^{4}\) Oxygen: \([He]2s^{2}2p^{4}\) Scandium: \([Ar]3d^{1}4s^{2}\) Lithium: \([He…
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christian manages a team of scientists for a large chemical company. ev…
B. Leading
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states of matter phet simulation directions: 1. open the phet simulatio…
| Solid | Liquid | Gas | |--|--|--| | The ice is in a rigid state. | The ice became a liquid at 0°C. | The water became a gas at 100°C. | | The molecules are in a fixed, ordered p…
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which of the following best illustrates green marketing? a company clai…
C. A company promoting how well its detergent product cleans using cold water while emphasizing the environmental benefit
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if the change in mass of a metal salt is negative, which of the followi…
a) The salt is diamagnetic and the metal ion is repelled by the external magnetic field
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3. if the temperature of 34.4 g of ethanol increases from 25 °c to 78.8…
Question 3: Approximately $4507.7\ J$ Question 4: Approximately $300.0\ J$ (heat loss) Question 5: Approximately $32284\ J$ (heat loss)
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question 9 (1 point) listen to determine if the metal salt contains par…
B. place the magnets on the metal salt vial.
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question 8 (1 point) how many unpaired electrons does co³⁺ have? a) 6 b…
C. 4
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hydrogen selenide (h₂se) reacts with water according to the following e…
The acid is $\mathrm{H_2Se}$, the base is $\mathrm{H_2O}$, the conjugate base is $\mathrm{SeH^-}$, and the conjugate acid is $\mathrm{H_3O^+}$.
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question 7 (1 point) listen what charge does a zinc ion most often have…
A. +2
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question 6 (1 point) what orbital contains the highest energy electron …
B. 5s
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liquid water can be separated into hydrogen gas and oxygen gas through …
No, the pressures are not equal because the number of moles of the two gases are different while volume, temperature and the gas - constant are the same.
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question 5 (1 point) listen which of the following is the correct elect…
a) [Kr]4d^{8}
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question 4 (1 point) how many valence electrons does a neutral as atom …
5
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question 3 (1 point) which is true for a paramagnetic salt? a) has orbi…
C. Has orbitals that contain unpaired electrons
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question 2 (1 point) what is the correct electron configuration for sil…
C. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{2}$
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what is the correct abbreviated electron configuration for germanium (g…
e) [Ar]4s²3d¹⁰4p²
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in 3-5 sentences, summarize how the change of state from ice to water i…
When ice is heated, kinetic energy of its molecules increases. This increase allows kinetic energy to overcome intermolecular forces of attraction in ice. As a result, ice melts i…
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what is the ph of a 1 × 10⁻⁴ mol hcl solution? (1 point) o 6 o 8 o 2 o 4
D. 4
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based on patterns in the periodic table, which list shows the acids in …
HCl, H₂S, PH₃ (corresponding to option: HCl, H₂S, PH₃)
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which statement best describes what it means when something is classifi…
It easily dissociates into ions in solution
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how is a mole related to concentration? (1 point) the volume of particl…
The number of particles of solute in a solution is measured in moles.
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which of these substances would be more soluble in cold water than warm…
Oxygen gas
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crystals are made using supersaturated solutions of solids in water. th…
The water would need to be heated to a higher temperature, which would give molecules and ions more kinetic energy, increasing solubility.
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which statement best describes what happens when oil and water are stir…
Water molecules attract each other, but they will not attract oil molecules, causing separation
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when salt dissolves completely in water, which term best describes the …
C. solvent
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material in the tube, ph value (0 to 14 paper), ph value (4.5 to 7.5 pa…
A. The pH values from 4.5 - 7.5 are more precise for substances with pH values originally within the 4.5 - 7.5 range when measured with the 0 - 14 paper. B. It provides more accur…
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1. test: before you begin testing with the 4.5 - 7.5 paper, list the ph…
A. The 4.5 - 7.5 pH paper gives more precise readings for substances with pH values originally within the 4.5 - 7.5 range when measured with the 0 - 14 paper. B. It provides more …
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1. test: before you begin testing with the 4.5 - 7.5 paper, list the ph…
The pH values from the 4.5 - 7.5 paper are more precise for substances with pH values originally within the 4.5 - 7.5 range when measured with the 0 - 14 paper. For substances wit…
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5. suppose you have already compared the ph values of two substances us…
when both substances had a pH value of about 6 on the 0 - 14 paper
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4. based on the materials measured in the gizmo, what is the most likel…
B. 3.9
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2. a new mild dish detergent is being tested before putting it on the m…
(Without seeing the specific colors of A, B, C, D clearly in the image, assume based on general knowledge that a mild basic solution would likely match the color of the option cor…
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1. place these unknown ph test papers in order from most acidic to most…
Paper D, paper B, paper C, paper A
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which element does this bohr model represent? * nitrogen magnesium fluo…
C. Fluorine
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how many electrons will aluminum need to gain or lose to be left with a…
C. lose 3
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how many electrons will chlorine need to gain or lose to be left with a…
A. gain 1
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how many valence electrons does nitrogen have? * n 1 2 3 4 5 6 7 8
E. 5