化学
化学反応、化学量論、分子構造、元素の性質。
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how is fusion different from a simple chemical reaction? (1 point) ener…
Energy is released in a fusion reaction, but it is absorbed in a chemical reaction.
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during the early 1800s, these professionals regularly appeared in court…
forensic science
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determining the composition of an atom 1. calculate the number of proto…
Number of protons: 5, Number of neutrons: 6, Number of electrons: 5
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what does hydrophobic mean? loves water hates/dislikes water will disso…
B. hates/dislikes water
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which statement best describes the difference between a physical change…
A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.
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4. identify the reaction type shown here. nacl + agno₃ → nano₃ + agcl s…
Double Replacement
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1. identify the type of reaction shown here: s + cl₂ → scl₄ show the ty…
Combination
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atoms, elements and compounds student worksheet compound name\tchemical…
The completed table as shown above.
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how do scientists determine the number of neutrons in an isotope of an …
They subtract the atomic number from the atomic mass.
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2. create the generalized reaction for each reaction type by dragging s…
Combination: $A + B ightarrow AB$ Decomposition: $AB ightarrow A + B$ Single Replacement: $A+BC ightarrow AC + B$ Double Replacement: $AB + CD ightarrow AD+CB$ Combustion: $C_xH_y…
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which subatomic particle has a positive charge? all particles proton el…
proton
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summary in this section, we summarize the five reaction types. 1. summa…
Combination: Two simple substances, often elements, react to form a single compound. Decomposition: A single compound reacts to form two or more simpler substances. Single Replace…
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unit 7 \physical interaction\ test the function of an electric motor is…
electrical energy into mechanical energy
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unit 7 \physical interaction\ test the function of a generator is the c…
mechanical energy into electrical energy.
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4. balance the equation for the combustion of ethanol by dragging the c…
1. $C_{25}H_{52}$, 38. $O_2$, 25. $CO_2$, 26. $H_2O$
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2. in combustion reactions, a substance reacts with oxygen gas to produ…
$C_{25}H_{52}+O_2 ightarrow CO_2 + H_2O$
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1. observe the combustion of a candle. identify each substance in the t…
| Substance | Reactant or Product? | Evidence | |--|--|--| | CO₂ | Product | The probe reading shows the quantity of this substance increases as the candle burns. | | O₂ | Reactan…
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two versions of an element with different numbers of neutrons are calle…
isotopes.
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pregunta 1 - 27 a firefly uses specialized muscles to draw oxygen into …
C. Specifically
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passage: in nature nothing exists alone... the contamination of the env…
B. Cite specific ecological case studies that demonstrate cascading effects of chemical use.
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6. build the net ionic equation for the reaction that produces the lead…
$Pb^{2+}+2I^- ightarrow PbI_2$
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5. balance the double replacement reaction by dragging the correct coef…
5. Coefficients: 1, 2, 1, 2 6. $Pb^{2+}(aq)+2I^{-}(aq)\to PbI_2(s)$
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how did the concerns depicted in this cartoon affect the food industry?…
The federal government regulated the food industry in order to protect the health of the public.
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pregunta 1 - 22 while researching a topic, a student has taken the foll…
# Breve explicación: El objetivo de la investigación de Terada era determinar si parte del oxígeno de la Luna provenía de la Tierra. Las otras opciones se centran más en los métod…
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the surface tension of the alcohol propanol in air has a value of 23.70…
A. Propanol will have a lower boiling point than water because the forces between the molecules are smaller. C. Propanol will have a flatter meniscus than water because the forces…
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when he carried out his experiment, nathan found that he had three smal…
A. No, because the area exposed to the surface will be different, changing the rate of boiling.
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we use the solubility rules to determine the precipitate. the precipita…
The insoluble product is $\text{PbI}_2$. The balanced equation with states is $\text{Pb}(\text{NO}_3)_2(aq)+2\text{KI}(aq) ightarrow\text{PbI}_2(s) + 2\text{KNO}_3(aq)$
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clarisse had three substances. a white substance was waxy and malleable…
B. The white substance was molecular. C. The red substance was ionic.
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the double - replacement reaction is between aqueous lead(ii) nitrate a…
\(KNO_3\), \(PbI_2\)
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how does the strength of the forces that hold the basic particles of a …
B. Stronger forces between particles means the substance boils at a higher temperature.
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which statement describes the relationship between bonding and surface …
B. The more hydrogen bonds a molecule can make, the higher the surface tension.
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which two options describe physical properties of matter? a. a substanc…
B. A substance's ability to conduct electricity C. A substance's resistance to flow
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which type of force is the weakest? a. van der waals forces b. hydrogen…
A. Van der Waals forces
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which statement accurately describes malleability? a. a material with r…
A. A material with relatively weak bonds between its particles can be shaped into a thin sheet.
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b. balance the equation for the reaction between potassium iodide and c…
$2KI + Cl_2 ightarrow2KCl+I_2$
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a copper wire is left outside on the ground for several weeks. which st…
B. It becomes tarnished.
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why is an ice cube less dense than liquid water? a. molecules in ice ar…
A. Molecules in ice are more spread out than molecules in liquid water.
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which statement compares the attractive forces that hold particles toge…
C. Hydrogen bonding and Van der Waals forces are weakly attractive; ionic and polar covalent bonds are strongly attractive.
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which statement describes a physical property related to the particles …
C. Salt crystals are hard and brittle because they are made up of atoms that combine by ionic bonding.
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why do nonpolar compounds tend to have lower melting points and boiling…
D. Nonpolar molecules only have Van der Waals forces between them.
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what is the name of large molecules that are made up of many small subu…
Polymer, Macromolecule
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4. observe the reaction between potassium chloride and iodine. kcl + i₂…
The solution remains purple.
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3. observe the reaction between potassium iodide and chlorine. ki + cl₂…
The solution turns from clear to purple.
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10. we have observed that zinc is capable of replacing lead in a single…
$\text{Pb(NO}_3)_2(aq)+\text{Zn}(s) ightarrow\text{Zn(NO}_3)_2(aq)+\text{Pb}(s)$
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10. we have observed that zinc is capable of replacing lead in a single…
$Pb(NO_3)_2(aq)+Zn(s) ightarrow Zn(NO_3)_2(aq) + Pb(s)$
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which statement is the best description of a chemical reaction? the com…
forming or breaking bonds
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which statement describes an endothermic reaction? o energy is created …
Energy is absorbed by the reaction.
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which statement accurately describes the products of a reaction? o subs…
new substances that are present at the end of a reaction
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what has occurred if an increase in temperature accompanies a reaction?…
Energy was released.
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which evidence is an indication that a chemical reaction has occurred? …
formation of a precipitate
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electronic cigarettes (also called electronic nicotine delivery systems…
Neither e - cigarettes nor traditional cigarettes should be used during pregnancy.
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5. build the chemical equation for the single replacement reaction betw…
$2\text{AgNO}_3(aq)+\text{Cu}(s) ightarrow\text{Cu(NO}_3)_2(aq) + 2\text{Ag}(s)$
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4. observe the particle animation of the copper and silver nitrate reac…
$Cu(NO_3)_2$
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question 12 one place to learn the proper ppe to use when handling haza…
the product label
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3. we begin by studying a single replacement reaction in which a metal …
The silver nitrate solution is colorless, while the resulting solution with copper(II) ion solution is blue.
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choose the correct answer. which of these has the least heat? gaseous f…
solid form of CO2
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in single - replacement reactions, a single element replaces a similar …
Circles represent elements (metals or non - metals in single - replacement reactions), squares represent non - metals in single - replacement reactions.
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1. in single - replacement reactions, a single element replaces a simil…
Circles represent elements. Squares represent compounds.
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answer all questions. use complete sentences true/false questions 1. th…
False ## b.
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2. the decomposition of water can be accomplished when electricity is a…
Gas 1 is hydrogen
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the chemical energy in your food is transformed into what type of energ…
C. mechanical
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4. build the chemical equation for the decomposition of water via elect…
$2H_2O\xrightarrow{electrolysis}2H_2 + O_2$
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when a person pushes a large load up an inclined plane, where does the …
Chemical energy
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which of the following can be considered chemical energy? a basketball …
a battery
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henry is visiting australia from germany and wants to buy 750 millilite…
28.80 EUR per liter
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3. observe and listen to the results of the splint test for gas 2. iden…
There is not enough information in the question to determine the answer among the options. But if we consider the characteristic reactions of these gases with a splint: - If the g…
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2. the decomposition of water can be accomplished when electricity is a…
Gas 1 is hydrogen
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the chemical energy in your food is transformed into what type of energ…
B. mechanical
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11. consider the following combination reaction: sodium metal reacts wi…
$2Na + Cl_2 ightarrow2NaCl$
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5 fill in the blank 2 points answer the following parts of question #14…
The compound is iron(III) sulfate. Roman numerals are used because iron is a transition - metal with multiple oxidation states, and the (III) indicates the + 3 oxidation state of …
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how many times can mechanical energy become chemical energy? an infinit…
an infinite number of times
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6. why is limestone considered an organic sedimentary rock? it is forme…
It is formed from minerals that came from organisms that were once living.
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10. balance the combination reaction between aluminum and iodine by dra…
$2Al+3I_2 ightarrow2AlI_3$ (coefficients are 2, 3, 2 respectively)
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what is the most common basis for the classification of minerals? taste…
chemical composition
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1. the bonneville salt flats in utah were formed by water evaporating a…
chemical sedimentary
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what is chemical weathering? * sediments change shape sediments are bei…
sediments change composition
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9. in the previous problem, ion charges were used to predict the formul…
Reactants: Al, $I_2$; Product: $AlI_3$
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7. in the previous reaction, the subscripts used to write the formula o…
$AlI_{3}$
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7. a mixture is a combination of two or more substances that are not ch…
homogeneous
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6. the correct balanced equation for the combination reaction between i…
The subscripts on the product are not related to the subscripts on the reactants.
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6. compounds that form when electrons are transferred between a metalli…
Ionic compounds
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multiply or divide the following measurements. be sure each answer you …
$0.490$ mol $1.1\times10^{3}$ mol/L $6.18$ mol
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5. balance the combination reaction between iron and oxygen by dragging…
4, 3, 2
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1. which of the following is not a characteristic of a compound? it has…
It has only atoms of the same element bonded together.
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4. combination reactions can be generalized as: a + b → ab express the …
$Fe + O_2 ightarrow Fe_2O_3$
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part iv - reflection questions 1. which particles contribute to the mas…
1. Protons and neutrons contribute to the mass number because they have significant mass. Electrons do not contribute as their mass is negligible. 2. Protons contribute to the ato…
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3. a new compound forms when energy is applied to the iron (steel wool)…
$Fe_2O_3$
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multiple - choice question what will analyzing the spectra of the stars…
What chemicals make up those stars.
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what is the correct coefficient ratio to have the equation balanced? mg…
C. 2:1:2
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match the following chemical as either a reactant or a product: mg + o2…
Mg: Reactant MgO: Product O2: Reactant
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2. steel wool is composed of iron. steel wool reacts with oxygen in the…
Fe, O₂
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use the energy diagram below to fill in the blanks. the energy of the r…
The energy of the reactants is 10 kJ and the energy of the products is 20 kJ. We know that the reaction represented by this energy diagram is endothermic because the energy of the…
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fill the the blank with the appropriate answer based on the energy diag…
The energy of the reactants is 40 kJ. The energy of the products is 20 kJ. The heat of reaction or $\Delta H$ is - 20 kJ. This reaction is Exothermic. The energy of the transition…
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the following shows the difference between a reaction with a catalyst (…
Having a catalyst present decreases the activation energy of a reaction
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9/29 swyk: energy & chemical reactions (20) match the statements with g…
Endothermic: A Exothermic: B Has a -$\Delta H$: B Has a +$\Delta H$: A Has an activation energy: Both A & B
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convert the following measurement. $7.79\times 10^{5}\frac{g}{molcdot l…
$7.79\times 10^{3}$
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chapter 4 atomic structure atomic orbitals (page 117) 7. is the followi…
8. more 9. 2
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1. which type of energy is not considered stored energy? kinetic energy…
A. kinetic energy
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convert the following measurement. $6.4\times10^{2}\frac{g}{molcdot l}=…
$6.4$
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read each description in the first column of the table below. if any ch…
1. Yes, Cs 2. Yes, As 3. Yes, Mg 4. Yes, Ag