Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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while looking at bromine (br) on the periodic table, a student needs to…
There are many possible elements, and they are all in the same vertical column as bromine.
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which represents an endothermic reaction? wood burning in a fire splitt…
splitting a gas molecule
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a chemical reaction that has the general formula of ab → a + b is best …
decomposition
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a sample is in the second half - life. what percent of the sample is st…
75%
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which statement describes heterogeneous mixtures? they are made up of t…
They are made up of two or more pure substances that are not chemically bonded together and appear non - uniform.
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nio conducts a science experiment. he puts yeast into a bottle with wat…
a chemical change, because a gas was produced
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which statement best describes the difference between endothermic and e…
They are opposites because endothermic reactions require energy and exothermic reactions release energy.
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a piece of sodium metal can be described as a pure substance and a comp…
a pure substance and an element.
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particle a has very little mass in comparison to particle b. both parti…
Particle A orbits the nucleus, and Particle B is located in the nucleus.
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this is how manganese appears in the periodic table. what is the arrow …
chemical symbol of manganese
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when coach kwan notices that a player is getting tired, she takes out t…
replacement
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which is produced in a synthesis reaction? a single element a single co…
B. a single compound
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when explaining chemical reactions to a friend, brianna models a reacti…
synthesis
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rosa was looking for patterns to help predict the products of chemical …
\(2LiCl + 3O_2\) (the first option)
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which clue can be used to identify a chemical reaction as a combustion …
A hydrocarbon reacts with oxygen.
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which clue can be used to identify a chemical reaction as a replacement…
The reaction has two reactants with ions that seem to switch places.
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a chemical reaction that has the general formula of ab + c → cb + a is …
single - replacement
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reactions learning check balance the reaction, then label the type of r…
\(1C_5H_{12}+8O_2 ightarrow5CO_2 + 6H_2O\) Reaction type: Combustion reaction
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balance the reaction, then label the reaction type: 2 al + 6 hcl → 3 h₂…
Single - replacement reaction
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based on the reaction, identify the products. bef₂ + mg → mgf₂ + what t…
The missing product is \(Be\). The reaction type is a single - displacement reaction.
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identify the reaction type shown and describe the clues that were used …
The reaction type is a decomposition reaction. The clue is that one compound (\(NH_4NO_3\)) breaks down into two simpler substances (\(N_2O\) and \(H_2O\)).
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identify the reaction type shown and describe the clues that were used …
This is a synthesis reaction. The clue is that two reactants (\(Fe_2O_3\) and \(SiO_2\)) combine to form one product (\(Fe_2Si_2O_7\)).
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predicting the products of a replacement reaction based on the replacem…
\(Be(OH)_2\)
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if carbon monoxide reaches a temperature of over 1,100 degrees fahrenhe…
\(2CO_2\) (the first option)
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if calcium carbonate (caco₃) decomposes, what would the product of the …
$\text{CaO}$
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identifying types of chemical reaction identify the reaction type for e…
Combination reaction; Decomposition reaction; Combustion reaction; Double - displacement reaction
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changes create brand - new substances while changes do not. most change…
B. Chemical, physical, physical, chemical
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which of the following is a physical change? freezing water baking brea…
freezing water
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which of the following is a physical change? freezing water baking brea…
freezing water
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crayons were left out in the sun and melted. what kind of change does t…
a physical change
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crayons were left out in the sun and melted. what kind of change does t…
a physical change
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summarize it! drag and drop the words or phrases that accurately comple…
All matter is made up of atoms which can be bonded together into molecules. In a physical change, the matter is still the same after the change, but its appearance will be differe…
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select the statement that best explains the difference between chemical…
The second option: "Physical changes are a change in the physical, observable properties of a substance. Most of these changes can be reversed. Chemical changes are a change in th…
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practice it! franklin created two lists, one for chemical changes and o…
Left - hand side header: physical changes; Left - hand side additional example: water evaporating (it is a physical change as water changes from liquid to gas state without changi…
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select the statement that best explains a chemical change. in a chemica…
In a chemical change the atoms are rearranged creating new substances. Most chemical changes cannot be reversed.
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practice it! select all options that are examples of a physical change.…
dissolving sugar in water, boiling water, breaking a glass, crushing a can
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drag and drop the state of matter and the description to the correct im…
- First image: State of matter - gas, Description - no defined shape or volume - Second image: State of matter - solid, Description - defined shape and volume - Third image: State…
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summarize it! drag and drop the words or phrases that accurately comple…
matter, Physical, properties, state of matter, gas, Chemical, heat, new, fireworks
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when providing first aid for a chemical burn: use high - pressure water…
For the chemical burn question: immediately flush the area with water for 20 minutes. For the tick removal question: Use tweezers to pull the tick away from the skin.
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practice it! select the list of examples that are chemical changes. che…
wood burning, fireworks exploding, food rotting, pipes rusting (the fourth option)
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practice it! select the option(s) that are examples of a physical chang…
B. a glacier melting, C. chewing food, D. a ball of slime being flattened, F. mowing grass
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matching 1 point match the example to the law of thermodynamics a perfe…
- Chemical energy being transformed to kinetic energy: 1st Law of Thermodynamics - Not being able to put every piece of a broken glass back together: 2nd Law of Thermodynamics - A…
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recall it! drag and drop the words to accurately label the molecular mo…
First cylinder: gas Second cylinder: liquid Third cylinder: solid
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which of the following is the correct dot structure for nitrogen? (1 po…
E
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34 what is the ground - state electron configuration of as? (1 point) a…
\[ \boxed{[Ar]4s^{2}3d^{10}4p^{3}} \]
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33 what rule is violated in electron configuration \d\? (1 point) a b c…
Aufbau principle
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32 what rule is violated in electron configuration \b\? (1 point) law o…
Hund's rule
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31 which of the following is the correct scientist and discovery pair? …
Thomson - determined mass to charge ratio of an electron.
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30 which of the following statements are not supported by daltons theor…
Atoms are destroyed in chemical reactions.
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carbon has two naturally occurring isotopes: carbon - 12 (abundance = 9…
12.01 amu
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in the isotope sodium - 24, what does the number 24 represent? (1 point…
Mass #
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26 how many protons does potassium - 42 have? (1 point) 23 19 42 39
19
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25 how many neutrons does potassium - 42 have? (1 point) 42 19 23 39
C. 23
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24 how many neutrons does beryllium - 9 have? (1 point) 4 6 5 9
C. 5
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chapter 3: the structure of the atom you should be able to understand t…
13
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21 density is an intensive property because it depends on the amount of…
21. B. False 22. B. 2:3
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20 what is the percent by mass of oxygen in compound below? (1 point) $…
\(53.3\%\) (the fourth option)
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19 if all of the reactants in a chemical equation are completely used, …
The total mass of the reactants must equal the total mass of the products.
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18 using your periodic table, calculate the total atomic mass of the co…
\(32.042\space \frac{g}{mol}\) (the fourth option)
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according to the law of conservation of mass, how much zinc was present…
\(104\space g\)
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16 select the answer that lists the elements in increasing atomic radiu…
Fluorine, Sulfur, Barium, Francium
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15 if 3.75g of x reacts with 12.5g of y to form the compound xy, what i…
D. \(23.1\%\)
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14 which of the following elements are the most reactive? (1 point) car…
Fluorine
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mass, understand the three laws (multiple proportions, conservation of …
Distillation
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an object with a mass of 7.9g raises the level of water in a graduated …
1.9 g/mL
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a 112 - g piece of metal has a density of 9.20 g/ml. a 50 - ml graduate…
32 mL
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the accepted density for copper is 8.96 g/ml. what is the percent error…
1.90%
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muslim american scientific innovators technological pioneers american m…
the Nobel Prize
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energy that comes from the movement of charged particles is electrical …
Electrical energy is transferred to the light bulb. Then, electrical energy is transformed into light energy and heat energy.
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choose the correct answer. knowing the mass and volume of a substance c…
density
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question 4 which of the following best describes the poems rhyme scheme…
The second and fourth lines in each stanza rhyme.
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double displacement reactions a precipitation reaction occurs when two …
1. \(Li_2S(aq)+2AgNO_3(aq) ightarrow 2LiNO_3(aq)+Ag_2S(s)\) 2. \(BaCl_2(aq)+Na_2CO_3(aq) ightarrow BaCO_3(s)+2NaCl(aq)\) 3. \(AlCl_3(aq)+Na_3PO_4(aq) ightarrow AlPO_4(s)+3NaCl(aq)…
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double displacement reactions a precipitation reaction occurs when two …
\(Li_2S(aq)+2AgNO_3(aq)\to 2LiNO_3(aq)+Ag_2S(s)\)
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11 - 12. what is the difference between cohesion and adhesion? give an …
Cohesion: attraction between same - substance molecules (e.g., water - water). Adhesion: attraction between different - substance molecules (e.g., water - glass).
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single replacement reaction worksheet for each reaction use the activit…
1. no reaction 2. \(Zn+2AgNO_3 = Zn(NO_3)_2 + 2Ag\) 3. \(Cl_2+2KI = 2KCl+I_2\) 4. \(Ba + Rb_2SO_4=BaSO_4 + 2Rb\) 5. \(Ca+Pb(NO_3)_2 = Ca(NO_3)_2+Pb\) 6. \(6K + Al_2(SO_4)_3=3K_2SO…
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question 5 read this excerpt from a poem. which element does it contain…
alliteration
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turn over a bag of potato chips. is the label interesting? a simple foo…
A. Labels show what goes into food, clothing, and other products. A simple product may have ingredients.
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2 select the correct answer. which element of modernist poetry is evide…
B. The poem’s sentences flow across stanzas
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1. during a lab, a student mixes two clear solutions. the mixture becom…
C. A chemical reaction occurred because new substances formed. 2.
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how many grams of nacl are required to precipitate most of the ag+ ions…
\(0.252\space g\)
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calculate the concentration (in molarity) of an naoh solution if 25.0 m…
\(0.303\space M\)
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which scientists law about the ratios of masses of elements in a compou…
Joseph Proust
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identifying ions which ion is formed when an atom of fluorine (f) gains…
\(F^{-1}\)
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are powerful chemical substances secreted by the endocrine glands and c…
Hormones
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how would you prepare 70.0 ml of 0.200 m hno3 from a stock solution of …
\(3.50\space mL\)
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complete the following table for a solution at ( 25^{circ} mathrm{c} ).
| pH | \([H_3O^+]\) | Solution is | |---|---|---| |\(<7\)|\(>1.0\times 10^{-7}\text{ M}\)|Acidic| |\(>7\)|\(<1.0\times 10^{-7}\text{ M}\)|Basic| |\(=7\)|\(=1.0\times 10^{-7}\text{…
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read the passage from sugar changed the world. no one could have seen i…
Advances in the production of sweeteners hastened the end of involuntary servitude.
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read the passage from sugar changed the world. no one could have seen i…
Advances in the production of sweeteners hastened the end of involuntary servitude.
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read the passage from sugar changed the world. we all crave sweetness, …
Sugar cane is no longer the main source of sweetness for most people.
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most plastic bags are made of polyethylene. polyethylene is a kind of p…
The second model shows polyethylene.
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which of the lewis structures in the image is correct?
C.
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use the drop - down menus to order the steps for writing chemical names…
1. Use the chemical symbols and the periodic table to identify the names of the elements in the compound. 2. Use the subscripts to determine the number of each atom in the compoun…
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millions of years ago, tiny marine organisms died and sank to the ocean…
Petroleum reservoirs are often found in limestone, a type of rock that typically forms in shallow marine environments.
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scoring: your score will be based on the number of correct matches minu…
\([CH_{4}]\): Higher, \([CCl_{4}]\): Higher, \([CH_{2}Cl_{2}]\): Lower
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use the references to access important values if needed for this questi…
- The value of \(K_{c}\): remains the same - The value of \(Q_{c}\): is less than \(K_{c}\) - The reaction must: run in the forward direction to reestablish equilibrium - The conc…
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use the references to access important values if needed for this questi…
\(16.1\)
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why is waters surface tension important? it causes water to spread out …
Freeze at \(32^{\circ}F\), boil at \(212^{\circ}F\)
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37. consider the reaction ( 2 mathrm{al}(mathrm{s})+mathrm{fe}_{2} math…
The amount of \(Al_{2}O_{3}\) is \(1.11\space mol\) and the mass is \(113\space g\)
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36. the mineral cuprite consists of 88.8% cu and 11.2% o by mass; deter…
The empirical formula of cuprite is \(Cu_{2}O\)
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35. a 75.00 g sample of a substance is analyzed and found to consist of…
The percent composition of phosphorus is $43.64\%$ and the percent composition of oxygen is $56.36\%$.