化學
化學反應、化學計量、分子結構與元素性質。
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phase changes study guide name: philanders bowie date: directions: use …
4. Melting; Absorbed; Particles gain energy, move more freely (vibrate more and can slide past each other), spacing increases. 5. Freezing; Released; Particles lose energy, moveme…
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what causes different colors to appear in the sky? the absorption of li…
the scattering and reflection of light by dust particles
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in an oxidation - reduction reaction, how is the reducing agent changed…
It loses electrons and loses potential energy.
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answer the questions: moles to mass conversion: 1. convert 3 moles of s…
1. \(175.32\space g\) 2. \(50.045\space g\)
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a nitrogen molecule with a mass of 4.7 × 10^-26 kg, moving at 550 m/s, …
8. The change in velocity of the nitrogen molecule is \(-1100\space m/s\) 9. The change in momentum of the molecule is \(-5.17\times 10^{-23}\space kg\cdot m/s\)
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current attempt in progress lets say you are interested in learning abo…
hierarchy
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in most exergonic reactions, before products can be formed, the reactan…
activation energy of the reaction.
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states of matter name: give the correct definition for the following ch…
1. Gas to Liquid: Condensation 2. Solid to Liquid: Melting 3. Liquid to Solid: Freezing 4. Liquid to Gas: Evaporation (or Vaporization)
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which describes one of oxygens roles in earths atmosphere? allows fuels…
allows fuels to burn
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what test can be performed on a fiber to determine the identity of the …
- First question: Fiber Burn Analysis - Second question: Locard’s Exchange Principle
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which is a nonchemical method for cleaning a floor? using a mop and ble…
using a broom and dustpan
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electrons an atom needs to satisfy the octet rule. atoms may form singl…
a. \( :\text{Br}:\text{I}: \) b. \( \text{H}\underset{\text{H}}{\overset{\text{H}}{\text{C}}}\text{H} \) (where each line between \( \text{C} \) and \( \text{H} \) represents a pa…
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use colored pencils to circle the common atoms or compounds in each equ…
\(Mg + O_{2} ightarrow MgO\): \(S\) \(HgO ightarrow Hg + O_{2}\): \(D\) \(Al_{2}O_{3} ightarrow Al + O_{2}\): \(D\) \(Cl_{2}+NaBr ightarrow NaCl + Br_{2}\): \(SR\) \(H_{2}+N_{2} i…
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3. a reaction will never be spontaneous when a) δg°>0. b) δh°<0 and δs°…
b) $1.2\times10^{6}$; decrease
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number of electrons needed = 8 - number of valence electrons number of …
The number of electrons an atom shares in covalent bonds is equal to \(8 - \text{Number of valence electrons}\) (for atoms following the octet rule, e.g., most non - metals). For …
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iclicker question 2 (3 mins) a system fitted with a piston expands when…
D. 63.2 L
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which process is defined as breaking down rocks into smaller pieces wit…
mechanical weathering
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mendeleevs approach included leaving spaces in his table for elements n…
Dmitri Mendeleev developed the periodic table in 1869 by arranging elements based on atomic weight and their recurring properties. His predictions about the properties of undiscov…
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a sample of gas occupies 175 ml at 0°c. what is its volume when the tem…
The final volume of the gas is approximately \(207mL\)
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10. a 14.02 g sample of magnesium reacts with oxygen to form 24.98 g of…
a. $\frac{14.02}{24.98}\times100\approx56.12\%$ b. $\frac{24.31}{40.31}\times100\approx60.31\%$ c. $\frac{\vert60.31 - 56.12\vert}{60.31}\times100\approx6.95\%$
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drag and drop the items to correctly label the interaction between two …
Top label (dashed line): Hydrogen bond Bottom label (solid line within the molecule): Covalent bond
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9. what is the percent composition of na₂co₃?% na =% c =% o =
\(\%\text{Na}\approx43.4\%\), \(\%\text{C}\approx11.3\%\), \(\%\text{O}\approx45.3\%\)
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the bohr diagram for an unknown element is posted above. answer the fol…
El elemento en cuestión tiene 6 electrones. El elemento en cuestión tiene 2 niveles de energía. El elemento en cuestión tiene 4 electrones de valencia. El elemento en cuestión es …
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use the equation to answer the question. ch₄ + ______cl₂ → ccl₄ + _____…
\(4,4\) (the third option)
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which statement is true? (1 point) atoms always remain intact during ch…
Atoms always remain intact during chemical reactions.
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sodium hydroxide (naoh) and hydrochloric acid (hcl) combine to make tab…
\(NaOH + HCl ightarrow NaCl + H_{2}O\) (the second option)
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a coefficient serves which purpose in a chemical equation? (1 point) it…
It shows how many molecules there are of a particular substance.
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which statement best represents the law of conservation of matter with …
The reactants and products have the same number and type of atoms, and the atoms are recombined.
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6co₂ + 6h₂o → c₆h₁₂o₆ + 6o₂ in a chemical equation, what do we call the…
B. Reactant
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6co₂ + 6h₂o → c₆h₁₂o₆ + 6o₂ in a chemical equation, what do we call the…
A. Product
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an atom has a mass number of 35 and 16 protons. calculate the number of…
19
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an atom has a mass number of 24 and 12 protons. calculate the number of…
12
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examine the nuclear reaction: 1 1 h + 0 1 n → 1 2 h. why is this classi…
A change has occurred in a nucleus.
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consider the nuclear equation. 239 94 pu→x+4 2 he what is x? 243 92 u 2…
\( ^{235}_{92}U \)
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deuterium is an isotope of hydrogen. the nucleus of a deuterium atom co…
\(2_{1}^{2}H ightarrow_{2}^{3}He+_{0}^{1}n\)
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in the lab, where curious minds abound a science experiment, a tale to …
B. line 7
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my grandmothers cookies by a gautam she bakes and she forgets she eats …
D. The rhyme and rhythm provide a musical quality to the poem.
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use the slides (link in instructions to help you answer the question.) …
potential energy
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curious minds in the lab, where curious minds abound a science experime…
A. ABA, ABA, ABA, ABA, ABA, ABAA
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ex: aluminum oxide = al₂o₃, you would type: al2o3 rubidium fluoride
RbF
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which of the following best describes the structure of sonnet 130? petr…
Shakespearean sonnet with three quatrains and a couplet
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lab 2: mass and volume lab in the \mass and volume lab\ we used water d…
The density of the aluminum foil is approximately \(2.56\space g/mL\) and the percent error is approximately \(5.19\%\)
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3. a student states that the total mass of the 4 aluminum pieces would …
b. The mass of 4 pieces of aluminum is equal to 2.00g because the process of cutting is a physical process.
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write a ground state electron configuration for each neutral atom. grou…
| Element | Electron configuration | Abbreviated electron configuration | |--|--|--| | Na | \(1s^{2}2s^{2}2p^{6}3s^{1}\) | \([Ne]3s^{1}\) | | C | \(1s^{2}2s^{2}2p^{2}\) | \([He]2s…
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name: lab 3: thickness of a thin layer/density of a gas unit 1 lab prac…
C. The samples have the same density. Team B has more mass and more volume than Team A, therefore the density of both Teams will be equal.
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when 0.503 g of sodium metal is added to an excess of hydrochloric acid…
\(-478\space kJ/mol\)
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1. cleaning and sanitizing refer to two different actions. true false 2…
1. True 2. False 3. Let them air dry.
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how does rb bond with other elements? (1 point) rb gains two electrons.…
Rb loses an electron.
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practice writing binary ionic formula examples: 1. magnesium + chlorine…
1. \(MgCl_{2}\) 2. \(Al_{2}O_{3}\) 3. \(CaCl_{2}\) 4. \(Li_{2}O\) 5. \(CaO\)
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which feature is unique to group 18 nonmetals? (1 point) they follow a …
They are very nonreactive.
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how do nonmetals tend to form bonds? (1 point) by gaining protons by lo…
by gaining electrons
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why does the reactivity of metals increase from right to left on the pe…
Metals on the right have more protons, causing valence electrons to be held more strongly.
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electronegativity which statement describes the bonds in iron sulfate (…
Fe and S are ionically bonded, while S and O are covalently bonded.
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electronegativity this image shows electronegativities of elements on t…
Fluorine (F)
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what will happen if you add more solute to a saturated solution? ○ it w…
It will remain undissolved in the container.
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which item is a pure substance? sugar iced tea a penny ocean water
sugar
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which statement is true of pure substances? o they can only contain one…
They may contain one type of atom or one type of molecule.
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in a solution of a carbonated beverage, what is the dissolved carbon di…
the solute
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what is the water referred to as in a solution of a carbonated beverage…
C. a solvent
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how does the law of conservation of mass apply to this reaction: mg + h…
The equation needs to be balanced. There are fewer hydrogen atoms in the equation than magnesium or chlorine.
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how does the law of conservation of mass apply to this reaction: c₂h₄ +…
B. Each element needs to be balanced.
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in the reaction ( 4al + _o_2 \to 2al_2o_3 ), what coefficient should be…
3
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in the reaction ( 2h_{2}+o_{2}\to __h_{2}o ), what coefficient should b…
B. 2
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part 5: independent practice 5 water. partnered with the wind, surface …
1. D. Certain species, such as Hawaiian crickets, struggle and adapt to survive. 2. B. “It took time, but these barren new 'worlds,' risen from the sea and born of fire, finally s…
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this illustration shows the neutral atoms and ions for some of the elem…
- When an atom loses electrons to form a positive ion: The ionic radius decreases. - When an atom gains electrons to form a negative ion: The ionic radius increases. - Effect of l…
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which statement is true? (1 point) atoms always remain intact during ch…
Atoms always remain intact during chemical reactions.
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all chemicals are to be considered dangerous. true false question 18 1 …
- First question: True - Second question: False - Third question: True
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question 15 1 pts when you finish working with chemicals, biological sp…
For the first question: plenty of water. For the second question: wash your hand thoroughly with soap and water. For the third question: True.
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19 multiple choice 5 points how many valence electrons does group 18 ha…
8
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17 fill in the blank 5 points periods go choose your answer... and grou…
Periods go left and right and groups go up and down.
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16 fill in the blank 5 points in a nuclear symbol, the atomic mass numb…
top
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sedimentation, fossilization review assignment page name kenneth date p…
1. C. Calm lake beds with fine sediment deposits 2. B. Replacement of organic material with minerals 3. B. A gap in the rock record due to erosion or non - deposition 4. B. Rapid …
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13 multiple choice 5 points what is the last orbital filled for k? 2s 3…
4s
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12 multiple answer 5 points which two atomic particles make up the atom…
C. Neutron, D. Proton
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energy is the ability to cause change. energy transformation occurs whe…
thermal
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which of the following is an example of a chemical change?a fire burnin…
a fire burning wood
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a physical change occurs when _______. there is a flame elements chemic…
the size, shape, or state of matter changes
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multiple choice 5 points what element has 9 e - and an atomic mass numb…
F
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in its pure form, what state of matter is carbon? solid plasma liquid
solid
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the atomic number is the number of protons in the nucleus.which element…
Potassium
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8 true or false 5 points mosley published the first periodic table. tru…
False
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if an atom has no charge or a neutral charge, what can we say about the…
There will be the same number of protons and electrons.
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located at the center of the atom, the nucleus consists of protons with…
In the nucleus
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7 fill in the blank 5 points in a nuclear symbol, the atomic number is …
Bottom
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the ph scale ranges from 0 to 14, with acids having a low ph and bases …
The substance is most likely a base.
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6 multiple choice 5 points which is the correct hyphen notations for th…
Oxygen - 16
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5 multiple choice 5 points electrons are equal to the number of in a ne…
Protons
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4 multiple choice 5 points if an element has a pel of 7 and 7 valence e…
Ts
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which of the following statements about freezing is true? the energy le…
The energy level of the substance decreases.
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3 multiple choice 5 points what is the last orbital filled by li? 2s 3s…
2s
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when you boil water, what is happening to the particles? the particles …
The particles speed up.
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when butter is heated, its particles move faster and it changes from a …
Melting
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2 multiple choice 5 points what element has an atomic number of 16? s h…
A. S
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1 multiple choice 5 points the atomic number on the periodic table is t…
Protons
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15. an element has three naturally occurring isotopes. information abou…
a. The atomic mass of the element is \(24.31\) amu (rounded to two decimal places). b. Looking at the periodic table, the element with an atomic mass of approximately \(24.31\) am…
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14. an element has three naturally occurring isotopes. isotope 1 has a …
a. The atomic mass of the element is approximately \(20.18\) amu. b. Looking at the periodic table, the element with an atomic mass of approximately \(20.18\) amu is Neon (\(Ne\)).
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porcelain originated in china around 2,000 years ago, but its productio…
C. It identifies when and where porcelain eventually began to be produced in Europe.
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13. calculate the atomic mass of iridium. iridium has two isotopes. iri…
The atomic mass of iridium is approximately \(192.2\) amu.
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additional equation that is not on your reference list! pv = nrt questi…
C. \(Zn^{2+}\) and \(SO_4^{2 - }\) # Question 8
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what is the formula for iron (iii) chloride? fecl₂ fe₃cl fecl₃ fecl
C. \(FeCl_{3}\)