化学
化学反応、化学量論、分子構造、元素の性質。
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question 23 (1 point) listen ______________is a noble gas and _________…
1) Ar and I
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question 22 (1 point) cr and cs represent the following elements respec…
3) Chromium and Cesium
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question 21 (1 point) ai3+ ion has ______________number of electrons an…
2) 10 electrons, 13 protons
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question 20 (1 point) what are the names of the elements pb and ag, res…
2) Lead and Silver, respectively
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question 1 (1 point) listen what is the symbol for calcium and gold, re…
3) Ca and Au, respectively
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question 1 (1 point) listen rutherfords gold foil experiment showed tha…
1) Protons and electrons, respectively
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question 17 (1 point) listen __________ is an example of a liquid nonme…
2) Bromine and Iodine, respectively
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for an isotope of silver had atomic number of 47 and mass number of 108…
Number of protons: 47; Number of neutrons: 61
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question 15 (1 point) listen the number of electrons, protons and neutr…
3) 18 electrons, 16 protons, 16 neutrons
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question 14 (1 point) listen which of the following pairs has approxima…
4) A $^1$H atom and a neutron
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question 13 (1 point) which of the following statements is false? 1) th…
4) Cations are formed when atoms gain electrons
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question 9 (1 p) listen who among the following scientists discovered o…
3) Joseph Priestley
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question 8 (1 point) which of the following is a compound? 1) o2 2) p4 …
4) SO₃
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question (1 point) listen which of the name - symbol combination is cor…
1) Magnesium= Mg
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question 6 (1 point) which of the following are chemical properties? ch…
2) A solution of substance - A releases gas when another solution is mixed with it 4) Several ingredients when mixed and baked, form a cake 5) Sugar turns brown and then black whe…
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question 5 (1 point) which of the following are physical properties? ch…
1) A substance undergoes Evaporation 2) Condensation 3) Ammonium chloride solid when heated, goes from solid state to gaseous state.
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question 4 (1 point) which of the following is a heterogenous mixture? …
1) Whole blood from humans (has white blood cells, red blood cells, plasma, etc 2) The air that we breathe during traffic 4) Fertilizers and potting soil in a pot
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question 3 (1 point) listen which of the following is a homogenous mixt…
1) Solution of sugar dissolved 3) A cup of black coffee
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which of the following is a pure substance? check all that apply 1) a s…
4) A piece of silver metal 5) A compound formed by metal combining with nonmetal
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15) in a chemistry class, the average age of 19 students is 16.21. a fo…
D. 16.25
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match the following elements with f - electrons filling up group 7a ele…
Elements with f - electrons filling up: 6. lanthanides and actinides Group 7A: 3. halogens Elements that have both properties of metals and nonmetals: 7. metalloids Group 2A: 2. a…
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atomic structure cfu which element does this bohr model represent on th…
B. F (Fluorine)
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is a smaller subatomic particle that is negatively charged and found ou…
E. electrons
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22. marla sometimes stays after school to tutor classmates. if it is tu…
No. Just because Marla arrived home at 4 P.M., we cannot conclude that it is Tuesday. The fact that she arrived home at 4 P.M. is the result of tutoring chemistry, but there could…
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subatomic particle proton neutron electron charge positive negative neu…
proton - positive neutron - neutral electron - negative
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the number of ______ is always equal to the atomic number of the elemen…
D. protons
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show all your work to receive credit. 1. calculate the molar mass for t…
1a. $133.33\ g/mol$ 1b. $291.73\ g/mol$ 2. $0.302\ mol$ 3. $\approx5.30\times10^{22}$ molecules 4. $\approx249\ g$ 5. $\approx6.27\times10^{23}$ atoms 6. $\approx45.3\%$
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adds mass to the nucleus of the atom, but has no charge. o neutrons o e…
A. neutrons
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how many total atoms are in a carbon dioxide molecule? hint: the sphere…
3
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in its pure form, what state of matter is hydrogen? solid liquid gas
Gas
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choose the correct answer. which of these is the atomic number of carbo…
6
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which of these is the atomic mass of cobalt (co)? 58.933 co 27
58.933
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which element has an atomic number of 19? calcium sodium potassium
Potassium
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which element has 33 protons in its nucleus? selenium phosphorus arsenic
C. Arsenic
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which best describes an electron? a part of an atom that is positively …
C. The part of an atom that is negatively charged
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copper is made of atoms. an atom is the smallest part of an element. at…
a copper atom
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which element shares similar properties to aluminum (al)? phosphorus (p…
Gallium (Ga)
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the different - colored squares on the periodic table show elements tha…
Strontium (Sr)
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which is true about the properties of compounds? they are different tha…
They are different than the elements that make them.
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how are compounds formed? condensation evaporation percolation chemical…
chemical change
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the image below is water. it is made of two hydrogen atoms and one oxyg…
They share or give away their electrons.
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when two elements bond and form a compound, what happens to their neutr…
The neutrons remain the same in the nucleus of each atom.
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which type of substance is formed by the chemical combination of two or…
B. a compound
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this image shows a model of an ammonia molecule. ammonia has one nitrog…
yes
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sodium is a metal and chlorine is a gas. is sodium chloride (table salt…
no, it has completely different properties
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sodium is an element. chlorine is an element. when sodium and chlorine …
a compound
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sodium is a metal. chlorine is a gas. their chemical symbols are shown …
yes
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water is called the universal solvent because it can dissolve many diff…
False
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which of the following is an exothermic process? combustion of fuel pho…
Combustion of fuel
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ice floats on water because: ice is denser than liquid water ice molecu…
Ice floats on water because: Ice is less dense than liquid water Exothermic reactions absorb heat from their surroundings. False
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what is the volume in milliliters of 7.18 g of acetone? express your an…
$9.14\ mL$
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missed this? watch we 2.16; read section 2.10. you can click on the rev…
$14.36\ g$
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part a what is the mass in grams of 18.26 ml of acetone? express your a…
$14.33\ g$
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electron configurations 13. identify the block, period and group the fo…
a. Block: s - block, Period: 2, Group: 2, Electron configuration: $1s^{2}2s^{2}$ b. Block: s - block, Period: 3, Group: 2, Electron configuration: $1s^{2}2s^{2}2p^{6}3s^{2}$ c. Bl…
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drag each change in matter to the correct category. physical changes ch…
Physical Changes: Mixing Dough, Crushing a Can, Clouds Forming, Melting Ice Chemical Changes: Fireworks, Rotting Fruit, Baking Cookies, Rusting, Antacid in Water Gas bubbles form,…
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4. refer to the periodic table below and answer the questions that foll…
Alkali metals: A Good conductors: H Alkaline - earth metals: D Elements with 1 valence electron: A Element with similar properties as A: C Halogens: G Transition metals: H
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read the passage from a letter that president jimmy carter wrote to con…
Protecting the environment is essential for maintaining Americans' quality of life.
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use the periodic table to determine which of the following could be an …
Z = 35, A = 79; A = 79, N = 44
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1. in the blank, label the elements or properties as metal(m), nonmetal…
1. Argon: NM, Potassium: M, Arsenic: met, Chromium: M, Neon: NM, Sodium: M, Cobalt: M, Radon: NM, Nitrogen: NM, Silicon: met, Calcium: M, Antimony: met 2. atomic number 3. b. iodi…
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give the chemical formula and chemical name that would result from the …
Chemical Formula: LiI Chemical Name: lithium iodide
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6. fill in the organizer below listing the subatomic particle propertie…
| Properties | Neutron | Proton | Electron | |--|--|--|--| | Has “+” charge | | Yes | | | Has “-” charge | | | Yes | | Has “no” charge | Yes | | | | Is found in the nucleus | Yes …
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what do all physical changes have in common? the substance looks differ…
In physical changes, the chemical composition of the substance remains unchanged.
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give the chemical formula and chemical name that would result from the …
Chemical Formula: $AlN$ Chemical Name: aluminum nitride
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determine which of the following electron configurations are not valid:…
26) Not valid 27) Not valid 28) Valid 29) Valid 30) Valid
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why is dissolving sugar in water a physical change? the sugar is broken…
The sugar molecule stays the same substance —it just mixes in.
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what happens when sugar dissolves in water? the sugar is turned into a …
The sugar particles spread out evenly in the water.
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give the chemical formula and chemical name that would result from the …
Chemical Formula: $SrS$ Chemical Name: strontium sulfide
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determine what elements are denoted by the following electron configura…
21. S 22. Rb 23. Sb 24. Os 25. Es 26. Not valid 27. Not valid 28. Not valid 29. Valid 30. Not valid
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1. what is the name of each labeled subatomic particle? a: electron b: …
3. Mass number: 9 4. Symbol: $Be$. It has 4 protons, and beryllium has an atomic number of 4. 5. Charge: 0. The number of protons (4) equals the number of electrons (4).
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11. refer to the bohr models above: element c is in period ___. element…
Element A is in group 6. Element B is in group 2. Element A is in a higher period. Element B has a lower shielding effect compared to Element C. Element C is in a higher period.
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prompt: in a couple of complete 5 to 7 sentence paragraphs, using evide…
Physical properties are characteristics of a substance that can be observed or measured without changing the substance's chemical identity. Examples include color, density, and me…
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give the chemical formula and chemical name that would result from the …
Chemical Formula: $CsF$ Chemical Name: cesium fluoride
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1. what is the name of each labeled subatomic particle? a: electron b: …
Protons: 4 Neutrons: 5 Electrons: 4
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11. refer to the bohr models above: element c is in period ___. element…
Rb: + 1 Br: - 1 N: - 3 Al: + 3 Mg: + 2 S: - 2
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mark which best describes the ionic compound that would result from the…
Ionic compound with a strength of 4
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structure of the atom the following diagram shows an atom. use the diag…
a: Electron b: Proton c: Neutron
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11. refer to the bohr models above: element c is in period ___. element…
Rb: + 1 Br: - 1 N: - 3 Al: + 3 Mg: + 2 S: - 2
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mark which best describes the ionic compound that would result from the…
None of the given options correctly describe the ionic compound formed from rubidium and fluorine.
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mark which best describes the ionic compound that would result from the…
No ionic compound is formed since you do not have a metal and a nonmetal
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using the periodic table, complete the table to describe each atom. typ…
A. 8 B. 15 C. O D. 26 E. 30 F. Fe
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mark which best describes the ionic compound that would result from the…
No ionic compound is formed since you do not have a metal and a nonmetal
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mark which best describes the ionic compound that would result from the…
lonic compound with a strength of 6
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mark which best describes the ionic compound that would result from the…
No ionic compound is formed because a noble gas does not react
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protons neutrons number number (symbol) 20 20 a b c 9 d e 19 f using th…
A. 20 B. 40 C. Ca D. 10 E. 9 F. F
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mark which best describes the ionic compound that would result from the…
Ionic compound with a strength of 4
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mark which best describes the ionic compound that would result from the…
Ionic compound with a strength of 2
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19. in a lab, the melting point of salicylic acid is measured to be 45.…
19. $1.36\%$ 20. $4.25\%$
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why is mixing a salad considered a physical change? mixing is another e…
The ingredients stay the same, just combined.
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click the link here to open the atom - building interactive, and click …
1. 2 2. 1 3. 7 4. 3
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why is shredding paper a physical change? the paper is still paper, jus…
The paper is still paper, just in smaller pieces.
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doreen schmidt is a chemist. she needs to prepare 24 ounces of a 9% hyd…
12 ounces of the 6% acid solution and 12 ounces of the 12% acid solution should be in the mixture.
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7. in general, the atomic radius (increases, decreases) from top to bot…
7. Increases; Decreases; Decreases; Increases 8. d. B because it is harder to remove a valence electron from B. 9. c. B because it is a nonmetal and wants to gain electrons. 10. (…
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drag each component of an argument to the statements that fit those com…
claim: Atoms cannot be created nor destroyed in a chemical reaction. reasoning: Balanced equations always begin and end with the same number of each element; The periodic table of…
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dawn schmidt is a chemist. she needs to prepare 24 ounces of a 9% hydro…
12 ounces
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drag the chemical expression to the number of atoms. > get help here zn…
ZnCl₂ - three atoms 2HCl - four atoms Zn - one atom H₂ - two atoms
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19. in a lab, the melting point of salicylic acid is measured to be 45.…
26. 2 27. 4 28. 3 29. 4 30. 1 31. 2 32. 4 33. 4 34. 3 35. 2 36. 3
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7. what are produced when a base is mixed with water? a. hydrogen ions …
7. b. hydroxide ions 8. c. hydrogen bonds
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reread the chemical properties section: write your response to the foll…
- What is a chemical property? A characteristic of a substance observed during a chemical reaction. - Give two examples of chemical properties: Flammability, reactivity with water…
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9. (\frac{5}{5}+\frac{2}{2}) 10. dilution ((c_1v_1 = c_2v_2)): ((0.50m)…
$50\ mL$
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how many electrons are in an atom of elemental sodium? equal to the num…
equal to the number of protons