化學
化學反應、化學計量、分子結構與元素性質。
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true or false question true or false: atomic mass does not always incre…
True
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spdf orbitals explained - 4 quantum numbers, electron con... the organi…
3s
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fill in the blank question in a neutral atom, the number of protons equ…
electrons
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true or false: mendeleev left blank spaces in his original periodic tab…
True
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8. for the table below, specify the dominant intermolecular force invol…
| Substance #1 | Dominant Intermolecular Force | Substance #2 | Dominant Intermolecular Force | Substance with Higher Boiling Point | | ---- | ---- | ---- | ---- | ---- | | HCl(g)…
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fill in the blank question elements in the same group (column) of the p…
chemical properties
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fill in the blank question in the modern periodic table, elements are a…
atomic number
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multiple choice question what are vertical columns in the periodic tabl…
groups
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fill in the blank question because atoms are too small to see, scientis…
microscopes
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fill in the blank question horizontal rows of elements in the periodic …
Periods
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select the correct answer in this equation, stands for carbon, stands f…
D. 2CO + 2NO → 2CO₂ + N₂
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multiple choice question the element chlorine is made up of two isotope…
B. 35.5 amu
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select the correct answer. to determine whether a chemical reaction has…
A. solubility
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which image depicts the correct transfer of electrons between calcium a…
A.
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which image represents the ionic compound strontium fluoride, srf2? a. …
C. $Sr^{+2}2[:\ddot{F}:]^{-1}$
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which image depicts the initial atoms when calcium and sulfur form an i…
B. Ca with 2 valence electrons and S with 6 valence electrons
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why did he fill each orbital individually before pairing the electrons?…
This is due to Hund's rule, which states that electrons will occupy degenerate orbitals singly with parallel spins before pairing up to achieve a lower - energy, more stable elect…
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which image depicts the initial atoms when strontium and fluorine form …
C. :F• Sr •F:
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which image depicts the transfer of electrons between strontium and flu…
C. Sr⁺² 2[:F:]⁻¹
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fill in the blank question arranging elements by atomic always puts the…
number; mass
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the three images depict the progression of the dot structure for mgcl2.…
Image B
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the three images depict the progression of the dot structure for mgcl2.…
Image A
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the three images depict the progression of the dot structure for mgcl2.…
C. Image C
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multiple choice question which is the weighted average mass of all natu…
A. average atomic mass
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mendeleevs method for arranging the periodic table led him to add blank…
atomic mass, chemical properties
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multiple select question select all that apply carbon - 12 □ has 12 pro…
B. has a mass number of 12 C. is an isotope of carbon D. has 6 protons and 6 neutrons
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1. when an inductor that lacks a color code or other value identificati…
C. a multimeter
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multiple choice question if two elements are side by side on the period…
Its atomic number is always one unit greater.
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the c layer is made of ______ and has no_______ at all. soil, organic m…
C. rock, organic matter
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fill in the blank question. atoms of the same element that have differe…
Isotopes
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fill in the blank question atoms of the same element that have differen…
isotopes
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select the correct number the equation shows neutralization of an acid …
2
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select all the correct answers. copper is listed in the 29th position i…
A. a metal E. an element
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consider the balanced chemical equation. 2h2(g) + o2(g) → 2h2o(g). how …
4
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select all that apply which statements about how scientists use models …
Models of atoms are examples of scaled - up models. Models show the distances between subatomic particles. Models help scientists visualize atoms because atoms are too small to se…
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multiple choice 1 point which of the following has the greatest electro…
KBr
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multiple choice question the sum of the number of protons and the numbe…
O mass number
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the average mass of the isotopes of an element, weighted for their natu…
atomic mass
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fill in the blank question complete this equation: mass number = number…
neutrons
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multiple choice question which of the following statements best describ…
atoms of the same element with different mass numbers
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categorize the following bonded atom types in the appropriate bond clas…
Nonpolar Covalent Bond: N - N Polar Covalent Bond: S - O, P - F, Al - Cl Ionic Bond: Ba - Cl, Cs - Br
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multiple choice question the atomic number of an atom is equal to the n…
the number of protons in the nucleus
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multiple choice question for atoms to be different isotopes of an eleme…
B. neutrons
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a solution was prepared by dissolving 105.0 g of kcl in 215 g of water.…
0.10
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fill in the blank question daltons atomic theory allowed chemists to ex…
quantitative; symbols
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determine which intermolecular forces are the dominant (strongest) forc…
NH₃: H - bond HBr: DDI CHCl₃: DDI CH₃COOH: H - bond Cl₂: LDF Ne: LDF
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which of the following would have a lower melting point? hf n2 hcl ch3c…
1. B. N₂ 2. A. C₂H₅OH
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fill in the blank question because atoms are too small to see, scientis…
microscopes
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fill in the blank question the blank blank of an atom is the sum of the…
mass number
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below is a table showing different properties of the atom. number the s…
1. Electrons 2. Positive atomic nucleus 3. Protons 4. Neutrons 5. Electron shells
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in the equation 2h₂ + 1o₂ → 2h₂o if you change the 2h₂ to 3h₂ molecules…
It is not possible to produce water without leftover molecules.
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it takes 1 molecule of nitrogen and 3 molecules of hydrogen to produce …
$2N_2$ and $6H_2$
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which statement correctly explains why the ashes of burnt paper have le…
Some of the atoms in the paper became gases.
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multiple choice question a certain atom of boron has 5 protons and 6 ne…
C. 11
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one molecule of calcium oxide, cao, and one molecule of carbon dioxide,…
$CaCO_3$
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multiple choice question what is the abbreviation for the unit of measu…
B. amu
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when iron rusts and forms iron oxide, the iron oxide has more mass than…
The oxygen atoms in iron oxide have more mass than the iron atoms in pure iron.
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statement 9. there would be no life on earth without nitrogen. 10. food…
9. T 10. T 11. F 12. F 13. T 14. T 15. F 16. T
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fill in the blank question the number of in an atoms nucleus is equal t…
protons
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multiple choice question which was a benefit that chemists derived from…
It provided a physical explanation of chemical reactions.
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in 1938, swiss chemist albert hoffman derived ______, a hallucinogenic …
A. LSD
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multiple select question select all that apply which statements about h…
A. Models show the distances between subatomic particles. B. Models help scientists visualize atoms because atoms are too small to see. D. Models of atoms are examples of scaled -…
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fill in the blank question the mass of an atom is measured in
atomic mass units
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what does adding more enzymes to to a reaction rate? raising decrease i…
Increase
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fill in the blank question according to a model of the atom used today,…
electron - cloud
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fill in the blank question according to a model of the atom used today,…
orbital
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atomic structure worksheet period 4 list the 3 subatomic particles, the…
| Element | Symbol | Atomic Number | Atomic Mass (rounded) | # of Protons | # of Electrons | # of Neutrons | | ---- | ---- | ---- | ---- | ---- | ---- | ---- | | sodium | Na | 11 …
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fill in the blank question daltons atomic theory allowed chemists to ex…
atomic; formulas
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what is synecdoche in literature? a figure of speech where one word or …
A. A figure of speech where one word or phrase is substituted for another with which it is closely associated.
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select the correct boxes. which two elements have the same number of va…
Silicon, Carbon
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fill in the blank question daltons atomic theory allowed chemists to ex…
quantitative; formulas; equations
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date 10/6/25 atomic structure worksheet period 4 list the 3 subatomic p…
| Element | Symbol | Atomic Number | Atomic Mass (rounded) | # of Protons | # of Electrons | # of Neutrons | |---|---|---|---|---|---|---| | sodium | Na | 11 | 23 | 11 | 11 | 12 |…
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history of the atom chemistry name: match the scientist to their discov…
1. James Chadwick - The nucleus also contains neutrons. 2. J.J. Thomson - Atoms contain negative particles called electrons. 3. John Dalton - Elements are made from solid spheres.…
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as you read, take notes on how dickinson uses figurative language to de…
B. The variation in the meter mimics the speaker's uncertainty about death.
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fill in the blank question because atoms are too small to see, scientis…
microscopes
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history of the atom chemistry name: launch each of these scientists con…
- **Launch**: John Dalton - Elements are made from solid spheres; J J Thomson - Atoms contain negative particles called electrons; Ernest Rutherford - Atoms have a positive nucleu…
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drag each label to the correct image. each label can be used more than …
Lemon juice: acidic Salt solution: neutral Baking soda: alkaline Bleach: alkaline Tomato juice: acidic Gastric juices: acidic
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chapter 3 achieving mental and emotional health lesson 3 expressing emo…
Emotions: Feelings that impact mental and emotional well - being. Hormone: Chemical messenger in the body influencing emotions. Hostility: Negative, aggressive emotion. Empathy: A…
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fill in the blank question the small, positively charged center of the …
nucleus
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outline a lecture working with others in a group, take turns slowly rea…
1. Discovery of Antarctic ozone - hole (1980, 30% depletion) 2. Cause: Synthetic chemicals (CFCs) 3. Ozone layer's role and health risks 4. Impact of ozone drop on skin cancer 5. …
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choose the image where a chemical reaction has not taken place. eggs co…
The image of water boiling.
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multiple choice question scientists look for quarks by analyzing data f…
D. high speed collisions between particles
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fill in the blank question are particles in the nucleus with an electri…
Protons
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multiple choice question what is the term for the small, positively cha…
nucleus
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the smallest particle of an element that retains the properties of the …
Atom
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groups of the periodic table elements on the periodic table are categor…
groups
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fill in the blank question the letter c is the symbol for the element n…
carbon
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groups of the periodic table * elements on the periodic table are categ…
1) Calcium (Ca): Group 2 2) Neon (Ne): Group 18 3) Bromine (Br): Group 17 4) Copper (Cu): Group 11 5) Lithium (Li): Group 1 6) Silver (Ag): Group 11 7) Xenon (Xe): Group 18 8) Tho…
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select the correct answer from each drop - down menu. 2naoh + h₂so₄ → n…
The equation is **unbalanced** because the number of hydrogen atoms and **oxygen** atoms is **not equal** in the reactants and in the products (the correct balanced form should ha…
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the periodic table contains three types of elements: metals - hard, shi…
For the classification of elements in the periodic table: - Metals: Elements on the left - hand side (Groups 1 and 2) and most in the middle (transition metals). - Non - Metals: E…
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how many electrons are in an atom of elemental sodium? equal to the num…
equal to the number of protons
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the periodic table is organized into periods and groups. periods - the …
1. 7 2. 18 3. Magnesium (Mg) 4. Fluorine (F) 5. Nickel (Ni) 6. Radon (Rn) 7. Francium (Fr) 8. Lead (Pb)
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select the correct answer. darryl finds a bottle of what looks like cle…
C. heterogeneous mixture
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fill in the blank question. , , and are the three basic subatomic parti…
Protons, Neutrons, Electrons
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fill in the blank question. a(n) is the smallest particle of an element…
atom
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use the periodic table to answer the following questions: atoms of whic…
- Atoms of which element contain 25 protons? - D. manganese (Mn) - Which element has an atomic number of 16? - B. sulfur (S)
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6. describe thomsons, millikans, and rutherfords contributions to atomi…
Thomson discovered the electron using cathode - ray tubes and proposed the plum - pudding model. Millikan measured the electron's charge with the oil - drop experiment. Rutherford…
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multiple choice question which is the symbol for the chemical element h…
A. H
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question 26 0.4 pts which atomic orbital is found on every energy level…
Question 26: C. s Question 27: C. 2p
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question 23 0.4 pts the number of electrons in the highest energy level…
Question 23: O 7 Question 24: O 5 Question 25: O 5