Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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select the correct text in the passage. which detail best supports the …
Still, it's a constant war these days against the dust that sweeps across the city limits, piling worst in dead ends and cul - de - sacs, like the one that shelters The Alchemy of…
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use the table to answer the questions below. when the temperature in a …
Gallium; remains a liquid; gas
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energy is released during which phase changes? check all that apply. bo…
B. condensing, C. depositing, D. freezing
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identifying the particles of an atom how many protons does this atom ha…
Number of protons: <Count of red spheres in nucleus> Number of neutrons: <Count of blue spheres in nucleus> Number of electrons: <Count of green - charged particles in orbitals>
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which statements describe phase changes? check all that apply. particle…
Particles in a liquid need to move more slowly in order to freeze. Attractive forces between the particles in a liquid are broken when a liquid boils.
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an atomic scientist was studying an atom and through experiment area su…
This atom has nine electrons.
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final assessment - forests: conservation & management forests: conserva…
C. Homestead act
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photosynthesis is a chemical reaction where carbon dioxide and water re…
D. $6CO_2 + 6H_2O ightarrow C_6H_{12}O_6 + 6O_2$
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jenny wanted to make 3 molecules of a substance made with aluminum and …
D. 6 aluminum; 9 oxygen
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a balanced chemical reaction obeys the law of a ideal gases. b definite…
C. conservation of matter
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which of these phrases would go in the overlap? select two options. fou…
Found in the nucleus, Has mass of one amu
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nabr + caf₂ → naf + cabr₂ what coefficients are needed to balance the c…
D. 2,1,2,1
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the decomposition of water into hydrogen gas h₂ and oxygen gas o₂ can b…
D. $2H_2O ightarrow 2H_2 + O_2$
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part a the students data can be seen here. a chemical reaction clearly …
Part A: A. 485.68g Part B: C. \(4Fe + 3O_2 ightarrow2Fe_2O_3\)
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a) pour chaque paire déléments, trouve la sorte de liaison en calculant…
1. Liaison covalente polaire, $H - Br$ 2. Liaison ionique, $Na^+$ et $F^-$ 3. Liaison covalente polaire, formule développée pour $NH_3$ par exemple $H - N - H$ avec doublet non - …
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four different liquid compounds in flasks at 20°c are represented above…
C. The strength of the intermolecular forces between the particles in the liquids
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aluminum + oxygen yields aluminum oxide write a balanced equation for t…
D. $4Al + 3O_2 ightarrow 2Al_2O_3$
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hcl + caco₃ → cacl₂ + h₂o + co₂. when you have an upset stomach and you…
C. 2,1,1,1,1
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during a physical science lab investigating chemical reactions, several…
A. 30 grams
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substance normal boiling point hf 293 k f₂ 85 k the electron cloud of h…
D. Liquid $F_2$ has weak dispersion force attractions between its molecules, whereas liquid HF has both weak dispersion force attractions and hydrogen bonding interactions between…
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w, x, y and z are elements in the same period in the periodic table. w …
D. W, Y, X, Z
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which chemical equation shows that the total mass during a chemical rea…
A. $Mg + Cl_2 ightarrow MgCl_2$
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question 14 5 pts how many electrons can fit in the first shell of the …
B. 2
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drag the item from the item - bank to its corresponding match. in any c…
1. Law of Conservation of Matter 2. Chemical Reaction 3. Reactants 4. Products 5. 13.5 g of H₂O 6. 36.5 g of HCl
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question 13 5 pts which of these elements is a metalloid/ silicon chlor…
Silicon
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the diagram above is a molecular model of a gaseous diatomic element th…
D. It does not show how the temporary fluctuating dipoles of the molecular electron clouds result in a net force of attraction between the molecules.
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which of these is a balanced chemical equation? a co(g) + o₂(g) → co₂(g…
C. $2CO(g)+O_2(g) ightarrow 2CO_2(g)$
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question 12 5 pts which of these elements is a group 7 member? calcium …
B. Chlorine
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4 of 10 which of the following acts encouraged settlers to move west an…
C. Homestead act
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if there are 4 grams of product produced by the chemical reaction, how …
D. 4 grams
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chemistry ch 04&05 - atomic structure (& electrons in atoms) review par…
## Part B 11. NT 12. AT 13. ST 14. AT 15. AT ## Part C 16. e 17. c 18. a 19. d 20. b
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predict the products of the decomposition of lithium nitride, li₃n. a l…
D. $Li + N_2$
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the diagram shows part of the periodic table. which element is correctl…
B. X, 2,4
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balance the chemical equation. a 1,2,1,2 b 1,1,3,1 c 3,1,3,2 d 2,3,2,3 …
C. 3, 1, 3, 2
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question 10 which group on the periodic table has stable elements? grou…
Group 8
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hcl + caco₃ → cacl₂ + h₂o + co₂. when you have an upset stomach and you…
C. 2,1,1,1,1
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question 9 5 pts what are the ideal mass numbers for carbon and boron 8…
C. 12 and 10
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question 8 5 pts which of the following elements belong to the same gro…
Sodium and hydrogen
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reaction amounts substance amount (reacted or formed) kclo₃ 10.0 g kcl …
D. Reaction 1: 2, 2, and 3; Reaction 2: 2, 2, and 3; 16.5 grams $Al_2O_3$
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question 7 what is the atomic symbol for gold? g au go a
B. Au
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law of conservation of mass experiment material(s) mass (g) mass of tes…
C. $43.48$ g
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question 6 5 pts what is the chemical name of kcl? phosphorus carbide p…
potassium Chloride
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question 5 5 pts what is the chemical formula/symbols of potassium? pk …
D. K
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4.2 structure of the nuclear atom ( & electrons in atoms) review sectio…
1. sub - atomic 2. negative 3. protons 4. neutrons 5. nucleus 6. Rutherford 7. positive 8. electrons 9. NT 10. AT
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in any chemical process, matter is neither lost nor gained the changing…
1. Chemical Reaction 2. Chemical Reaction 3. Reactants 4. Products 5. Reactants 6. Reactants, 36.5 g of HCl
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which of the following elements is a transuranium element? plutonium er…
plutonium
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which of the following lists the elements in order of increasing mallea…
Se, Sb, Sn
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question 4 5 pts what is an isotope? group of same elements with differ…
A. group of same elements with different number of neutrons
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which of the following elements is a metalloid? argon calcium sodium te…
D. tellurium
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these are the elements or compounds that enter into a chemical reaction…
1. Reactants: Elements or compounds entering a reaction 2. Products: Substances formed in a reaction 3. Reactants: $C_6H_{12}O_6 + 6O_2$ 4. Reactants: $6CO_2 + 6H_2O$ 5. Reactants…
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arsenic is a metalloid. how many valence electrons does arsenic have? o…
C. 5
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if there are 4 grams of reactant, how many grams of product are produce…
C. 4 grams
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which of the following shows three elements in order of increasing cond…
O, Ge, Mn
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question 3 5 pts how many protons, electrons, and neutrons in oxygen wi…
8 protons, 8 electrons, and 10 neutrons
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to what group do oxygen, nitrogen, and sulfur belong? halogens alkali m…
C. nonmetals
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identifying atoms that help protect the environment. which atom is bein…
D. iron
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use this completion exercise to check your understanding of the concept…
1. protons 2. number 3. electrons 4. protons 5. neutrons 6. isotopes 7. atomic mass 8. 1 9. 0 10. 1
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how is the modern periodic table arranged? by decreasing atomic number …
by increasing atomic number
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sodium, potassium, and cesium belong to which group? alkali metals halo…
alkali metals
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question 2 5 pts how many protons, neutron and electrons in an oxygen a…
C. 8 protons, 8 electrons, 8 neutrons
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fe(s) + cuso₄(aq) → feso₄(aq) + cu(s) this chemical equation represents…
D. single replacement
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a burning candle is covered by a jar as shown in the picture. the whole…
D. 500 g
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which of the following elements is a transition metal? sodium carbon ne…
D. Gold
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which category of elements is listed below the main body of the periodi…
inner transition metals
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click to select the correct answers. click again to unselect answers. l…
B. $2H_2+ O_2 ightarrow2H_2O$ is a balanced equation. D. A physical change does follow the law of conservation of mass. E. A pencil breaking is an example of a physical change.
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which of the following is a characteristic of nonmetals? nonmetals ofte…
Nonmetals are not ductile.
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a chemical equations shows the ____ on the right side of the yield arro…
1. A. products 2. B. diatomic 3. A. coefficients
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replacement involves one element replacing another element in a compoun…
1. A. single 2. B. combustion 3. B. synthesis and decomposition
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which substances are on the left side of a chemical equation? a the rea…
1. A. the reactants 2. B. an arrow 3. B. the products
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in synthesis reactions, there are always more ____ than a reactants, pr…
1. A. reactants, products 2. B. O 3. B. Decomposition
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a patient has diabetes, a disease that causes high blood sugar levels. …
A. carbohydrates
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match the letter with the color answer a. atomic # 17, used to kill bac…
A. Chlorine Green B. Bromide Brown C. Carbon Red D. Helium Brown E. Nitrogen Blue F. Sodium Blue G. Hydrogen Blue H. Mercury Brown J. Aluminum Brown N. Calcium Yellow O. Magnesium…
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reviewing vocabulary match the vocabulary word to its definition. elect…
electron cloud - the area of the atom surrounding the nucleus where electrons can be found electron - a negatively charged particle that orbits the nucleus of an atom nucleus - th…
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the chemical trimethylamine n - oxide not only gives fish their fishy s…
B. As a result,
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describe electrons. location: charge: mass:
Location: In electron shells around the nucleus Charge: Negative Mass: Approximately 9.109×10⁻³¹ kg
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chemical adjective of, produced or used by chemicals. cancel use this w…
The chemical reaction produced a strange - colored liquid.
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this question has two parts. answer part a, and then answer part b. par…
Part A: 3. The speaker gains a feeling of happiness when summer makes the earth beautiful. Part B: 1. "She drove the sap and broke the bud, She set the crimson rose afire." (Lines…
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instructions: use the formula for mass to solve the following problems.…
1. $3\ kg$ 2. $4.50\ kg$ 3. $6.14\ kg$ 4. $16.2\ g$ 5. $52.6\ kg$ 6. $3650\ kg$
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when the electrons of a chemical element change energy states, they rel…
B. identifies
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when the electrons of a chemical element change energy states, they rel…
A. identifying
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when the electrons of a chemical element change energy states, they rel…
A. identifying
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conservation of matter states that the reactants have to equal the ____…
1. A. products 2. A. atoms 3. B. 3
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how many no₃ are on the reactant side before being balanced? a 2 b 3 c …
1. Cannot be determined 2. Cannot be determined 3. Cannot be determined
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color by number erosion/weathering/deposition directions: read each que…
1. B. weathering [brown] 2. A. erosion [dark green] 3. C. deposition [purple] 4. C. both A & B [red orange] 5. C. deposition [light brown] 6. B. weathering [white] 7. A. erosion […
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the ____ step in balancing a chemical equation is to take inventory or …
1. A. first 2. C. subscript 3. 2
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comprehension questions for penguin prof chemistry basics part 2 1. wha…
1. Ionic bonds, covalent bonds, hydrogen bonds 2. They have full outer - electron shells. 3. By losing one or more electrons. Example: Sodium loses one electron to become $Na^+$. …
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passage poems great expectations, a novel written by charles dickens (1…
by personifying time as cruel and destructive
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oil and water heterogeneous mixture compound homogeneous mixture pure s…
# Breve explicación: El aceite y el agua no se mezclan uniformemente. Forman capas separadas, lo que significa que es una mezcla heterogénea. Un compuesto es una sustancia formada…
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question 25 bleach mixture heterogeneous mixture homogeneous mixture co…
C. homogeneous mixture
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what is club soda heterogeneous mixture mixture pure substance compound…
# Breve explicación: La soda club es una mezcla de agua y dióxido de carbono disuelto, entre otras sustancias en menor cantidad. Tiene una composición uniforme a nivel macroscópic…
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hydrogen peroxide mixture heterogeneous mixture element compound pure s…
D. compound E. pure substance
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what is air? heterogeneous mixture mixture pure substance compound homo…
homogeneous mixture
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identify each of the phase changes described below. liquid gold is pour…
1. Freezing 2. Vaporizing 3. Melting 4. Condensing 5. Depositing 6. Sublimating
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match the terms with their definition. 1. cohesion 2. capillary action …
1. e 2. g 3. a 4. f 5. d 6. b 7. c 8. b 10. a 11. b 12. blood vessels; against; water
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what is isopropyl alcohol heterogeneous mixture element homogeneous mix…
E. compound, D. pure substance
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what is lemon pledge □ homogeneous mixture □ compound □ pure substance …
homogeneous mixture
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what is vanilla mixture element compound homogeneous mixture pure subst…
heterogeneous mixture
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what is peanut butter mixture element heterogeneous mixture compound ho…
E. homogeneous mixture
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how many moles of lithium are in 25 g of lithium? 25 g li (\\frac{1 mol…
The mass of 11.5 moles of lithium is 79.81 g. For the multiple - choice question: 1 mol
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what is copper sulfate homogeneous mixture heterogeneous mixture compou…
C. compound, E. pure substance