Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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the picture shows a model of a helium atom and a model of a lithium ato…
C. Lithium has more protons, neutrons, and electrons.
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electronegativity is calculated using which of the following methods? c…
Calculating the average energy required to remove an electron
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elements are arranged in the periodic table based on various patterns. …
B. has a higher atomic mass than the element sodium (Na)
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in the graph, what is the general trend of ionization energy as atomic …
C. Increases
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what happens to ionization energy as you move across a period in the pe…
B. It increases
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along each row of the periodic table, a. atomic mass increases from lef…
A. atomic mass increases from left to right.
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which of the following make up the nucleus of an atom? a. protons and e…
B. protons and neutrons
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directions: select the correct answer from each drop - down menu. verti…
Vertical columns on the periodic table are called groups. The elements in each column have similar properties.
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based on the periodic table shown above, elements in which of the follo…
D. Group 17
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which three elements have strong magnetic properties? ○a. lithium, sodi…
B. iron, cobalt, and nickel
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the instrument that records earthquake events is called a ____________.…
1. A. seismograph 2. A. a rigid layer of crustal and mantle material
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the temperature at which a substance in the liquid phase transforms to …
C. boiling point
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all substances have characteristic properties. if one of these properti…
A. physical property
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3 which option provides an accurate and objective summary of the articl…
3. B 4. A
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mixtures: two or more ______ or ______ not chemically combined. no reac…
substances; elements; homogeneous mixtures; heterogeneous mixtures
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information that influences parents decisions about vaccines has evolve…
1. A 2. A
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this selection is mainly about how a engineers use 3 - d computer model…
D. scientists find solutions to human problems by studying nature.
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5. which characteristic of realism is still evident in most poetry writ…
the use of simple diction instead of lofty language
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3. which is a major characteristic of contemporary poetry today? rigid …
experimentation and the adaptation of poetic rules
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7. many of the elements we will use have an abbreviation (chemical symb…
| Element Name | Chemical Symbol | Atomic Number | Period Number | Group Number | Metal or Nonmetal | | ---- | ---- | ---- | ---- | ---- | ---- | | Gold | Au | 79 | 6 | 11 | Metal…
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describe the habitability of planets which statement accurately describ…
The terrestrial planets (except Earth) and the gas giants are not habitable.
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name: macquaid mod: 3b date: acb2: getting to know the periodic table a…
1. Groups 2. Periods 3. a. Left b. Right c. Hydrogen 4. Alkali Metals: Group 1 Alkaline Earth Metals: Group 2 Transition Metals: Groups 3 - 12 Post - Transition Metals: Groups 13 …
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which real - world scenarios below represent physical changes? check al…
Spreading peanut butter on bread, Diluting bleach with water, Mixing water and powdered drink mix
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a yellow liquid gets separated into a layer when it is stirred into wat…
Insoluble
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which of the following statements describes the conductivity of covalen…
There is no way to tell whether or not a covalent compound is conductive.
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a yellow solid melts at room temperature. it does not conduct electrici…
low melting point
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unit exam - covalent compounds 8 o 16.00 17 cl 35.45 what is the molar …
99.45
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unit exam - covalent compounds 1 h 1.01 16 s 32.07 what is the molar ma…
34.09 g/mol
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what is the molar mass of the covalent compound n₂o? n₂o = ? $\frac{g}{…
44.02
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what is the formula for dinitrogen monoxide? no₂ no₂ n₂o₃ n₂o
D. N₂O
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what is the formula for tetracarbon decoxide?
$C_4O_{10}$
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which of the following statements is true? oa. fossils are frequently f…
D. Igneous rocks form from the cooling and crystallization of magma.
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what is the formula for bromine trifluoride?
BrF₃
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what is the name of the compound c4n3? tetracyanide trinitride carbon t…
C. tetracarbon trinitride
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lifework 1. how can we tell that this black ink is made out of several …
1. During chromatography, the black ink separates into different colors and bands, showing it is made of several substances. 2. They will have different physical and chemical prop…
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what are chemicals that stay in the environment for a long time called?…
A. persistent
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which of these is the most persistent (stays the longest) in the enviro…
DDT and other chemicals like it
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there are several chemicals that can last for a very long time in an en…
DDT
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classification of matter crossword (some answers are used more than onc…
1. Solution 2. Homogeneous 3. Heterogeneous 4. Tyndall 5. Heterogeneous 6. Element 7. Element 8. Suspension 9. Compound 10. Mixture 11. Colloid 12. Compound
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3. fill in the following chart. dont forget to come the isotope symbol …
| Element Symbol | Atomic number | Mass number | # of protons | # of neutrons | # of electrons | |---|---|---|---|---|---| | $^{200}Hg$ | 80 | 200 | 80 | 120 | 80 | | $^{39}K^{+}$…
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types of hazardous waste hazardous waste encompasses a range of materia…
4
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what is a simple way of thinking about monomers? as long chains of smal…
C. As "building blocks"
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which of the following is corrosive? argon acid
Acid
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name: maquzstay mod: 3b date: acb2: getting to know the periodic table …
1. Groups or Families 2. Periods 3. a. Left b. Right c. Hydrogen 4. Alkali Metals: Group 1 Alkaline Earth Metals: Group 2 Transition Metals: Groups 3 - 12 Post - Transition Metals…
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____ glues cause a chemical reaction when the two components of the glu…
D. Epoxy
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2) choose the best answer. what was discussed at the karlsruhe congress…
What is the best way to notate elements using atomic mass?
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determine whether or not the equation is balanced or not and write a \b…
1. U 2. U 3. U 4. B 5. B 6. U 7. B 8. B
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define missouri compromise a united states federal legislation that sto…
a United States federal legislation that stopped northern attempts to forever prohibit slavery’s expansion by admitting Missouri as a slave state and Maine as a free state in exch…
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2) balance the following chemical equations: (2 marks each) c₃h₈(g) + o…
1. $C_3H_8(g)+5O_2(g) ightarrow 3CO_2(g)+4H_2O(g)$ 2. $3BaCl_2(aq)+2K_3PO_4(aq) ightarrow 6KCl(aq)+Ba_3(PO_4)_2(s)$
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define kansas - nebraska act a united states federal legislation that s…
1854 was a territorial organic act that created the territories of Kansas and Nebraska. It was drafted by Democratic Senator Stephen A. Douglas, passed by the 33rd United States C…
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1) neatly & clearly complete the following equations: (4 marks each) so…
1. Skeleton: \(Na_2O + H_2O ightarrow NaOH\); Balanced: \(Na_2O + H_2O = 2NaOH\) 2. Skeleton: \(Fe+HF ightarrow H_2 + FeF_3\); Balanced: \(2Fe + 6HF=3H_2 + 2FeF_3\) 3. Skeleton: \…
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04 question (2 points) open ebook section 3.5 chromium metal can be pro…
Part 1: 171.7 Part 2: 134.1
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03 question (1 point) hcl reacts with nh₃ according to the balanced equ…
0.132
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what type of change will alter the makeup of the elements or molecules …
C. chemical
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what type of change is rusting? a chemical change a physical change a h…
A. A chemical change
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when fireworks explode, what is happening to the fireworks? a thermal c…
C. A chemical change
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what happens during a chemical change? composition stays the same. mass…
Composition changes.
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what is the best definition of a chemical change? a chemical change is …
A. A chemical change is a change that produces a new substance.
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01 question (4 points) a 0.301 g piece of solid magnesium reacts with g…
Part 1: E. limiting reagent Part 2: C. actual yield
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chemists look at the world in two ways, often simultaneously. the two w…
1. Baking, digestion. 2. Substances and objects that can be seen, touched, and measured directly. 3. Particles that make up all matter and are not visible to the naked eye.
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question 5 (1 point) what should you do if spill naoh on yourself? a) d…
B. Wash the area with water
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what is the indicator that we will use in our titration lab? a) khc₈h₄o…
B. phenolphthalein
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question 3 (1 point) what is the molarity of a naoh solution with 4.55 …
C. 0.182 mol/L
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for the balanced reaction: 3 naoh + h₃po₄ → na₃po₄ + 3 h₂o3 moles of na…
1
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question 1 (1 point) how many moles are in 38.02 ml of 4.55 m naoh solu…
$0.173$
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review 1. who invented the first battery? 2. what contribution to chemi…
1. Alessandro Volta 2. Formulated Boyle's law 3. Alfred Nobel 4. Electrical insulators and early plastics
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20. analyze and interpret the data in the table below. which prediction…
Francium will have the lowest melting point and the largest radius of all the alkali metals.
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question 8 6 pts claim consumers should choose choose opposing claim th…
Consumers should choose organic fruits and vegetables whenever possible.
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19. the elements in group 2 have similar chemical properties because ea…
C. Number of valence electrons
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15. which ionization energy and electronegativity periodic trends are d…
The ionization energy decreases, and the electronegativity decreases.
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13. based on electron configuration, which atom has the greatest radius…
[Ar]4s²
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12. identify the period and group numbers of the element with the elect…
Period 3, Group 16
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- name three elements that are gases at room temperature. 2. element re…
1. Hydrogen, Oxygen, Nitrogen 2. Oxygen is a colorless, odorless, tasteless gas. It is vital for respiration in most living things. Used in medical settings for patients with brea…
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11. which atom gains electrons during the formation of magnesium sulfid…
:$\ddot{S}\cdot$
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9. covalent substances generally have lower melting points than ionic s…
Ionic bonds are stronger than intermolecular forces in covalent substances.
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circle the number which best answers each question. 1 the particle diag…
1. (4) a single compound 2. (4) (the diagram with the same number and type of atoms as the reactant diagram) 3. (2) a mixture of elements 4. (1) a heterogeneous mixture of element…
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2. determine the substance being oxidized, the substance being reduced,…
a. Substance being oxidized: $K$, Substance being reduced: $Br_2$, Oxidizing agent: $Br_2$, Reducing agent: $K$ b. Substance being oxidized: $Ca$, Substance being reduced: $H^+$, …
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1. determine the oxidation numbers for each element. a. br₂ br = 0 d. s…
a. Substance being oxidized: $K$, Oxidizing agent: $Br_2$ b. Substance being oxidized: $Ca$, Oxidizing agent: $H^+$ c. Substance being oxidized: $CO$, Oxidizing agent: $Fe_2O_3$
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1. using the table below, determine how many valence electrons are in a…
10
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6. atoms with the same number of protons but different number of neutro…
Isotopes
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4. what part of the element does the \8\ refer to in the diagram? oxyge…
Atomic Number
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3. what is the atomic mass of the element within group 17, period 2? 6.…
18.998 amu
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1. which term is defined as the energy required to remove an electron f…
A. Ionization energy
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1. determine the oxidation numbers for each element in the following sp…
a. $Br$ in $Br_2$: 0 b. $Fe$ in $Fe^{3 + }$: +3 c. $S$ in $SO_3$: +6, $O$ in $SO_3$: -2 d. $S$ in $SO_{3}^{2 - }$: +4, $O$ in $SO_{3}^{2 - }$: -2 e. $Ca$ in $Ca_3(PO_4)_2$: +2, $P…
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6.2 - classifying the elements (p. 167 - 173) 9) what chemical properti…
9) Noble gases are unreactive due to full outer - electron shells. Their electron configurations are stable (e.g., He: 1s², Ne: 1s²2s²2p⁶). 10) #34: Period 4, Group 16, Selenium, …
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24. which list arranges the elements na, li, k, rb and cs in order of i…
Cs, Rb, K, Na, Li
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23. the transition metals are characterized by having clear all incompl…
Incomplete d subshells
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22. as you move from top to bottom within a group in the periodic table…
Electronegativity decreases
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21. when dr. mendeleev created the first periodic table, what did he ba…
Atomic mass
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which of the following elements is most likely to have similar chemical…
A. Bromine (Br)
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abuse of illegal drugs illegal drugs are substances that one cannot leg…
1. A drug is illegal if one cannot legally own or sell it. 2. - effect(s): Gives users a temporary sense of well - being or pleasure. - dangers: Addiction, depression when effects…
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4. analyze: 1. one way to test what kind of gas is in the cylinder is t…
A. [Answer based on actual observation of glowing splint test] B. [Answer based on actual observation of burning splint test] C. [Gas identified based on A and B results] 5A. [Rea…
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identify the atom 1s² 2s² 2p⁴. oxygen aluminum hydrogen argon
Oxygen
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activity a: observing chemical changes get the gizmo ready: - click res…
A. $21^{\circ}C$ B. $50^{\circ}C$ C. exothermic
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18. which of the following elements has the largest atomic radius? sodi…
C. Lithium
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which of the following elements would you predict to be the most metall…
C. Iron
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16. which of the following statements about alkali metals is true? they…
They have low melting temperatures compared to other metals.
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endocrine glands secrete hormones directly into * 2 points synaptic gap…
1. the bloodstream 2. that endocrine messages tend to outlast the effects of neural messages
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15. what is the primary reason for the increase in ionization energy ac…
C. Increase in number of protons
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14. the trend in atomic size can be explained by increasing nuclear for…
Increasing number of protons