Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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how many protons would iron have? its atomic number is 26. its atomic m…
26
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question 4 of 15 when a ball rolls down a hill, what energy conversion …
A. Potential energy to kinetic energy
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which of the following statements about matter is false? matter occupie…
Matter is smooth and continuous.
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the melting of ice is a physical change. true false
True
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4. which of the following is a chemical hazard? a. electrocution b. oxy…
B. Oxygen deficiency
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the model below shows a calcium atom. how many electrons are in the thi…
8
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famous friday - for the following famous scientist, you must research w…
Amedeo Avogadro was an Italian scientist. He is best - known for Avogadro's law, which states that equal volumes of gases at the same temperature and pressure contain the same num…
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this is how sodium appears in the periodic table. the arrow is pointing…
atomic mass
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when an atom that has no charge loses two electrons, it becomes a posit…
A. positive ion
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directions: answer the following questions. 1. which of the following i…
1. C. Workers should become complacent in their work 2. B. Electrical work 3. D. Wear dry gloves 4. None of the above (but if forced to choose based on the nature of options, the …
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the odor of gasoline is a chemical property. true false
False
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which characteristics of dickinsons style are evident in \the snow\? se…
A. four - line stanzas C. a varying rhythm D. the use of personification
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the elements least likely to form bonds are found in which group? 15 16…
D. 18
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which property do metalloids share with nonmetals? both are brittle. bo…
Both are brittle.
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chem ch 3.1 - 4 water is a mixture. true false
False
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read the excerpt from \sonnet 29\ when, in disgrace with fortune and me…
A. abab
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gases are the only form of matter that is easily compressible. true fal…
False
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which argument best explains the charge of an atomic nucleus? an atomic…
An atomic nucleus is positively charged because it is composed of protons.
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an amorphous solid has long range, repeating order. true false
False
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12. think and discuss: what is the relationship between electron affini…
As atomic radius increases, electron - affinity generally decreases. This occurs because with a larger atomic radius, the nucleus has a weaker attraction for an added electron due…
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the elements in group 17 of the periodic table are all called halogens.…
number of valence electrons
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which properties are characteristic of metalloids? high electrical cond…
C. intermediate conductivity and a high melting point
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what trend does the reactivity of most nonmetals show in a periodic tab…
C. increases from left to right across the periodic table
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the table below lists the properties of a metallic element. property sh…
Group 12
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which properties make a metal a good material to use for electrical wir…
B. conductivity and ductility
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while looking at xenon (xe) on the periodic table, a student needs to f…
A. directly up
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which statements describe elements of free - verse poetry? select all t…
A. does not follow a strict rhyme scheme or meter B. does have a natural rhythm and flow
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read the lines below from \musée des beaux arts.\ what most helps you t…
B. They have no fixed rhyme scheme.
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read the passage and answer the following question(s). passage 2122 dir…
C. phosphorus
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read the passage and answer the following question(s). passage 1867 dir…
A. aluminum
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what environmental disaster can be attributed to over - population and …
B. climate change due to the greenhouse effect
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part 3a 12 marks choose 4 of 5 (lesson 3a) draw the following ionic bon…
a) Formula: $Li_3P$
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the dreamers gather in neo beijings starlight district. the wanderers a…
who is unable to speak the local language
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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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nabr + caf₂ → naf + cabr₂ what coefficients are needed to balance the c…
D. 2,1,2,1
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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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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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question 9 5 pts what are the ideal mass numbers for carbon and boron 8…
C. 12 and 10
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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 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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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