化学
化学反应、化学计量、分子结构与元素性质。
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the change in enthalpy of a reaction is equal to the enthalpy of the __…
products; reactants
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enthalpy is denoted by the symbol. j f δe h
\(H\) (the fourth option).
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the amount of heat given off or absorbed by a chemical reaction is call…
the change in enthalpy
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p - 5061 - ck - 01) / hesss law evaluation a chemical reaction that rel…
exothermic
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in an endothermic reaction ______. heat is absorbed and temperature dec…
heat is absorbed and temperature decreases
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6. how many moles of magnesium are there in 3.01 x10²² atoms of mg? c. …
\(0.05\) moles
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2. how many s subshells and how many p subshells are in one atom of arg…
There are \(3\) s sub - shells and \(2\) p sub - shells in one atom of argon.
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read the excerpt from \tools of the spymaster\. james jays invisible in…
Heating was a generally known means of reading invisible ink.
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write a balanced chemical equation based on the following description: …
\(2FeCl_{3}(aq)+3(NH_{4})_{2}S(aq)\to6NH_{4}Cl(aq)+Fe_{2}S_{3}(s)\)
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is the product identifier one of the required pieces of information to …
Yes
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are hazard and precautionary statements required pieces of information …
Yes
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question 10 identify the type of reaction for reactants are given. phas…
1. precipitation 2. oxidation - reduction 3. acid - base
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is a hazard pictogram one of the required pieces of information to be i…
Yes
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your employer is required to develop, implement, and maintain a written…
Safety training on all chemicals present
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identify the type of reaction for each of the following. note: phases o…
1. Double - displacement reaction 2. Single - displacement reaction 3. Acid - base (neutralization) reaction
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question 9 select the substances and coefficients to correctly complete…
\(2C_3H_6(g)+9O_2(g) ightarrow 6CO_2(g)+6H_2O(g)\)
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indicate the oxidation state for each of the following:phosphorus in $\…
- Phosphorus in \(P_4O_{10}\): \(+5\) - Sulfur in \(H_2SO_4\): \(+6\) - Nitrogen in \(NO_2^-\): \(+3\) - Oxidized element: \(S\) - Reduced element: \(O\) - Oxidizing agent: \(O_2\…
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what is the net ionic equation for the reaction between aqueous sodium …
D. \(H^{+}(aq)+OH^{-}(aq)\to H_{2}O(l)\)
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classify each of the following compounds as a strong acid, weak acid, s…
- \(HNO_{3}(aq)\): Strong acid - \(Ba(OH)_{2}(aq)\): Strong base - \(NH_{3}(aq)\): Weak base - \(HF(aq)\): Weak acid - \(HBr(aq)\): Strong acid
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which of the following is the correct net ionic equation for the reacti…
A. \(3Ca^{2 +}(aq)+2PO_{4}^{3 -}(aq)\to Ca_{3}(PO_{4})_{2}(s)\)
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indicate whether each of the following compounds are soluble or insolub…
\(BaSO_4\): insoluble; \(AgNO_3\): soluble; \(CaCO_3\): insoluble; \(Al(OH)_3\): insoluble; \((NH_4)_3PO_4\): soluble
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a patient undergoes chemotherapy and radiation treatments for a tumor. …
Toxic, Physical
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question 2 fill in the coefficients to balance the following equation. …
Part 1: \(2\) Part 2: \(3\) Part 3: \(1\) Part 4: \(3\) Part 5: \(3\)
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question 1 fill in the coefficients to balance the following equation. …
\(1\) \(As_2O_3+3\) \(H_2 ightarrow2\) \(As + 3\) \(H_2O\)
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we are reading a book about judy, a teacher who moves to a new place fo…
The part about Judy's mom scheming to get her married
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write the equilibrium constant expression for this reaction: ch₃cl(aq) …
$$K = \frac{[\text{CH}_3\text{OH}][\text{Cl}^-]}{[\text{CH}_3\text{Cl}][\text{OH}^-]}$$
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write the equilibrium constant expression for this reaction: ch₃cl(aq)+…
\(K=\frac{[CH_3OH][Cl^-]}{[CH_3Cl][OH^-]}\)
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write the equilibrium constant expression for this reaction: nh₄⁺(aq) →…
\(K=\frac{[NH_{3}][H^{+}]}{[NH_{4}^{+}]}\)
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write the equilibrium constant expression for this reaction: h₂so₄(aq) …
\(K=\frac{[H^{+}]^2[SO_4^{2-}]}{[H_2SO_4]}\)
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write the equilibrium constant expression for this reaction: 2h^{+}(aq)…
\(K=\frac{[H_{2}C_{2}O_{4}]}{[H^{+}]^{2}[C_{2}O_{4}^{2-}]}\)
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write the equilibrium constant expression for this reaction: h₃po₄(aq) …
\(K=\frac{[H^{+}]^3[PO_4^{3 - }]}{[H_3PO_4]}\)
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a reaction has the general rate law, rate = kab^3. if the concentration…
27
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5. urea (h₂nconh₂, m = 60.055 g/mol) can be produced by the following r…
\(11.1\ g\)
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we are reading a book about judy, a teacher who moves to a new place fo…
The part about Judy's mom scheming to get her married
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we are reading a book about judy, a teacher who moves to a new place fo…
# Brief[SSE Completed, Client Connection Error][SSE Completed, Client Connection Error][LLM SSE On Failure]
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each sketch is drawn as if the sample were under a microscope so powerf…
Change 1: a chemical change; Change 2: a physical change; Change 3: impossible.
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4. a mountain climber has partial pressures of o₂ and co₂ in her lungs …
a) \(0.217\ bar\) b) \(6.6\times10^{21}\)
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morrie has had a cold for 5 days, and his nose is so stuffy that he can…
B. To savor a taste, we need to breathe the aroma through our nose.
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lead (pb), silver (ag), and iron (fe) are examples of which of the foll…
C. elements
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an element can be identified by its properties. true false
TRUE
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which is an example of an element? a coal b sugar c water d neon
d. neon
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atoms of an element are alike and different from the atoms of all other…
TRUE
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no two elements are exactly alike. true false
TRUE
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what is the smallest particle of an element that still has all the prop…
A. atom
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which substance is made of only one type of atom? a fire b air c water …
d. element
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which element glows red when electricity flows through it? a carbon b i…
d. neon
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the smallest particle of an element that retains the properties of that…
atom
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aristotle correctly identified four of the elements. true false
FALSE
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the idea that all matter consists of the elements was first introduced …
FALSE
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which substance is an element? a carbon b air c fire d water
A. carbon
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which is the smallest particle of matter? a atom b element c proton d p…
A. atom
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an element is a pure substance that can be broken down into a simpler f…
False
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atoms are ______ in charge. a positive b negative c neutral d none of t…
C. Neutral
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a pure substance that cannot be separated into any other substances is …
element
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what is the smallest particle of helium? a proton b element c atom d el…
C. atom
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the components of a heterogeneous mixture are distinguishable from one …
TRUE
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a mixture consists of two or more phases. a homogeneous b heterogeneous…
B. Heterogeneous
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a, b and c represent elements as follows. which of the following does t…
a. Homogeneous mixture
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gases form heterogenous mixtures with each other regardless of the iden…
b. FALSE
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a solution of salt and water is a heterogeneous mixture. true false
FALSE
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which of the following is not a mixture? a ocean water b milk c brass d…
d. Ammonia
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which of the following contains a single phase? i. substance ii. homoge…
A. I and II
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when oil and water are mixed, two separate layers form. each layer is c…
d. phase
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complete the sentence using one of the following words: homogeneous, he…
heterogeneous
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sugar dissolves completely in water to form a solution. this solution i…
C. homogeneous mixture
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a mixture is a mixture in which the composition is not uniform througho…
heterogeneous
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a tossed salad is considered to be a ________.a heterogeneous mixtureb …
A. heterogeneous mixture
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all water molecules have the same number of atoms of each element in th…
TRUE
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properties of compounds differ from the properties of their elements. t…
TRUE
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a compound forms from elements held together by chemical bonds. true fa…
TRUE
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a molecule of a compound is made up of two or more atoms of different e…
TRUE
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the properties of a compound are the same as the properties of the elem…
FALSE
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compounds have the same properties as the elements that make them up. t…
FALSE
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is an atom of element a is an atom of element b is an atom of element c…
C. \(A_{2}B_{2}C_{4}\)
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is an atom of element a is an atom of element b is an atom of element c…
C. \(A_{2}B_{2}C_{4}\)
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a compound is made when less than two elements combine chemically. true…
False
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is an atom of element x is an atom of element y is an atom of element z…
False
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is an atom of element a is an atom of element b is an atom of element c…
B. \(A_{8}BC_{3}\)
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is an atom of element x is an atom of element y is an atom of element z…
C. X: 4, Y: 2, Z: 6
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how many elements does the compound, carbon dioxide or co₂, contain? a …
D. two
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is an atom of element a is an atom of element b is an atom of element c…
a
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below are four models of different compounds. if nitrogen atoms are lar…
B.
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what is the smallest unit of a compound, like carbon dioxide (co₂), tha…
C. a molecule
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which is an example of an ionic compound? a water b hydrogen peroxide c…
C. sodium chloride
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which example is a compound? a oxygen b hydrogen c carbon d hydrogen pe…
d. hydrogen peroxide
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sugar is composed of oxygen, hydrogen and carbon. which type of substan…
d. a compound
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which of the following is a compound? a oxygen b carbon c water d hydro…
C. water
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salt (nacl), water (h₂o), and carbon dioxide (co₂) are examples of whic…
C. compounds
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unique substances that form when two or more elements combine chemicall…
compounds
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what is a unique substance that forms when two or more elements combine…
Compound
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which gas is a compound? a air b carbon dioxide c nitrogen d oxygen
B. carbon dioxide
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what substance forms when two or more elements combine chemically? a an…
d. a compound
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mixtures are physical combinations of two or more substances. true false
TRUE
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true or false: air has its components spread evenly, so it is considere…
a. True
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the mixture is a physical blend of two or more components, each of whic…
A. TRUE
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a homogeneous mixture is a composition of two or more impure substances…
B. FALSE
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can homogeneous mixtures be separated into their components? yes no che…
Yes
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classify the following as either a substance or a mixture. \table salt\…
A. Substance
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the circles shown above represent three different elements. the six ima…
2
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which of the following is/are homogeneous mixture(s)? select all that a…
A. milk, C. liquid laundry detergent, D. vinegar, E. salt water