Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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elige una respuesta y pulsa siguiente. recibiras tu puntuación y las re…
Átomo de madera.
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elige una respuesta y pulsa siguiente. recibirás tu puntuación y las re…
Espacio vacío.
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completa este cuestionario para finalizar la tarea de química moderna q…
-1
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¿qué es un átomo? informar de un error pregunta 1 de 5 ○ la unidad bási…
La unidad básica de un elemento químico que contiene protones y neutrones en el centro, y electrones orbitando alrededor en la periferia.
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energy. these cells are expensive, but they produce no air pollution. w…
Water
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completa este cuestionario para finalizar la tarea de química moderna q…
tiene carga positiva.
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completa este cuestionario para finalizar la tarea de química moderna q…
el mismo número de protones.
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completa este cuestionario para finalizar la tarea de química moderna q…
No, porque tienen diferente número de protones.
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completa este cuestionario para finalizar la tarea de química moderna q…
Carbon
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completa este cuestionario para finalizar la tarea de química moderna q…
el número total de protones y neutrones.
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biomass energy can be a sustainable carbon - neutral source of energy. …
We burn it (combustion) or chemically convert it to biofuel.
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match the science term to its meaning. answer choices: regular, repeati…
- Ductile: Can bend or stretch without breaking. - Lattice: Regular, repeating pattern of atoms. - Free Electron: Electron that moves easily between atoms in a metal.
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consider this image. which type of multimedia presentation would this i…
a persuasive presentation about the importance of healthy food choices
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what atomic-level feature gives metals their strength? tightly packed a…
Electrons that float between atoms
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when a 0.740 - g sample of trinitrotoluene (tnt), ( c_{7}h_{5}n_{2}o_{6…
11.8 kJ, 1.36 kJ
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learn by doing when 100 ml of 0.200 m nacl(aq) and 100 ml of 0.200 m ag…
For the first reaction: C. - 1300 J For the second reaction: A. 2280 J
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what makes aluminum a useful material for outdoor structures? it is sof…
It is lightweight and resists rust.
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which of the following is a common impurity found in coal? copper sulfu…
sulfur
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a 70.0 g piece of metal at 80.0 ^ { circ } c is placed in 100.0 g of wa…
Heat given up: \(1087.84\ J\) Specific heat of metal: \(0.2805\ J/g^{\circ}C\) Final temperature: higher Computed heat lost by metal: larger Computed specific heat of metal: large…
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learn by doing a 310.0 g piece of aluminum initially at 314°c is droppe…
\(52^{\circ}C\)
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did i get this a 50.0 g piece of metal gains 2020 j of energy when it i…
The specific heat of the metal is approximately $0.45\ J/g^{\circ}C$. For the identification part, the specific heat of iron is approximately $0.45\ J/g^{\circ}C$. So the metal is…
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multiple choice 1 point which of these is a covalent compound? table sa…
Water (\(H_2O\))
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multiple choice 1 point what is the main difference between an ionic bo…
Ionic bonds give away electrons; covalent bonds share electrons.
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did i get this heat capacity is a -- property, meaning --. specific hea…
Heat capacity is an extensive property, meaning it depends on the amount of substance. Specific heat is an intensive property, meaning it does not depend on the amount of substanc…
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9. what is the isotope notation for thulium - 153? a: mass #? x: symbol…
- \(A:153\) - \(X:Tm\) - \(Z:69\) # 10. Name of Element with Atomic #37
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9) which of the following molecules would have a trigonal planar vsepr …
\(BF_3\) has a trigonal planar VSEPR shape.
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which of the following best describes peat? an early stage of coal form…
an early stage of coal formation
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7) what vsepr molecular shape would the following lewis structure exhib…
Bent (or V - shaped)
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6) how many bonded pairs of electrons does each atom have in a nitrogen…
Each nitrogen atom has 3 bonded pairs of electrons. The VSEPR shape of the \(N_2\) molecule is linear.
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natural gas is formed from marine mud. what is the primary component of…
Methane
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5) which molecule would have a larger bond angle, bcl₃ or cf₄? support …
\(BCl_3\) has a larger bond angle. The bond angle of \(BCl_3\) is \(120^{\circ}\) (trigonal planar geometry) and the bond angle of \(CF_4\) is \(109.5^{\circ}\) (tetrahedral geome…
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4) what is the vsepr molecular shape of carbon dioxide? support your an…
The VSEPR molecular shape of carbon dioxide (\(CO_2\)) is linear. The Lewis structure is \(O = C = O\).
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question 7 the appearance of alligatoring at a fire scene: a helps iden…
D. has no investigative significance.
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3) what is the bond angle of a tetrahedral molecular shape?
The bond angle of a tetrahedral molecular shape is \(109.5^{\circ}\).
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name pd 2) which vsepr molecular shape has two bonding pairs of electro…
bent
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1) what is the vsepr molecular shape of ph₃? support your answer with a…
The VSEPR molecular shape of \(PH_{3}\) is pyramidal.
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to rent a certain meeting room, a college charges a reservation fee of …
$t < 8$
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at what temperature does water turn from liquid to steam? 50°f 212°f 0°f
B. 212°F
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at what temperature does liquid water turn into steam? 212 degrees fahr…
212 degrees Fahrenheit
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what was the primary focus of rachel carsons book, silent spring, which…
C. chemical use in society
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vaping harms: test your knowledge instructions: read each statement. ci…
1. MYTH 2. MYTH 3. FACT 4. FACT 5. FACT 6. FACT 7. MYTH 8. MYTH 9. FACT 10. FACT 11. MYTH 12. MYTH
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1) calculate the molar mass of khp 2) what is a colorimetric ph indicat…
\(204.23\ g/mol\) ### 2)
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question 10 mark this question which molecule in the inflammatory respo…
Leukotrienes
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electrons orbit around the nucleus in circular path called , or . the f…
shells, energy levels, orbits; K - shell; L - shell; M - shell; N - shell
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what is the molar mass of this compound? ca(oh)₂ remember to round to t…
74.10 g/mol
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what is the molar mass of this compound? mn(so₃)₂ remember to round to …
\(215.08\space g/mol\)
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what is the molar mass of this compound? c4h10 remember to round to the…
$58.14\ g/mol$
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what is the molar mass of this compound? liclo₄ remember to round to th…
106.39 g/mol
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what is the molar mass of this compound? zn(c₂h₃o₂)₂ remember to round …
183.48 g/mol
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n : 14.01 g/mol h : 1.01 g/mol s : 32.07 g/mol o : 16.00 g/mol what is …
132.17 g/mol
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what is the molar mass of oxygen? remember to round to the hundredths p…
16.00 g/mol
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what is the molar mass of sulfur? remember to round to the hundredths p…
32.07 g/mol
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what is the molar mass of hydrogen? remember to round to the hundredths…
C. \(2.02\space g/mol\)
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what is the molar mass of nitrogen? remember to round to the hundredths…
\(14.01\space g/mol\)
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what is the molar mass of calcium iodide? ca 40.08 g/mol i 126.90 g/mol…
\(293.88\ g/mol\)
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a group of scientists were running an experiment in the lab. they thoug…
B. 28.7 L
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which of the following statements about compounds is true? a pure subst…
A substance composed of two or more elements in fixed, definite proportions.
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fill in the blank question the six noble gases in group seldom form bec…
18; compounds; stable
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during the day water heats to a gas under the hot arizona sun, once the…
D. -370395 J
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fill in the blank question an electron dot diagram for an atom of sulfu…
6
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the gas in the left box has a higher pressure than the gas in the right…
A. Number of particles
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fill in the blank question the electron dot diagram for hydrogen consis…
The electron dot diagram for hydrogen consists of the symbol \(H\) and \(1\) dot(s). The electron dot diagram for helium consists of the symbol \(He\) and \(2\) dot(s).
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multiple choice question compared with the properties of potassium iodi…
very different
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a sample of gas occupies 3.5 liters at a pressure of 1.3 atm and a temp…
A. 1.49 L
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fill in the blank question the noble gases are stable because they each…
full
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select all that apply which are components of electron dot diagrams? □ …
dots representing valence electrons, the chemical symbol of the element.
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select all that apply which are components of electron dot diagrams? □ …
dots representing valence electrons, the chemical symbol of the element
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the pressure exerted by a gas in a container depends on.. a the tendenc…
D. the number of collisions between gas molecules and the walls container.
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select all that apply which statements about the chemical stability of …
Hydrogen is stable when its outer energy level has two electrons.
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select all that apply which statements about the chemical stability of …
None of the given options are correct.
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select all that apply copper sulfate is made up of the elements copper,…
- Copper, sulfur, and oxygen can combine to form copper sulfate, which has properties that are distinct from each of those elements. - Copper, sulfur, and copper sulfate are all s…
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select all that apply which statements about noble gases are true? the …
- The noble gases are very stable, due to their electron arrangement. - The noble gases seldom form compounds. - The six noble gases are found in group 18.
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fill in the blank question a that compound. shows what elements a compo…
chemical formula
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multiple choice question an electron dot diagram includes the chemical …
Its valence electrons
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fill in the blank question the properties of a compound are often very …
different
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fill in the blank question the six noble gases in group seldom form bec…
18, compounds, stable
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multiple choice question the elements a compound contains and the exact…
chemical formula
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multiple choice question compared with the properties of potassium iodi…
very different
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true or false question true or false: the properties of a compound are …
True
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select all that apply copper sulfate is made up of the elements copper,…
B. Copper, sulfur, oxygen, and copper sulfate all have very different properties. C. Copper, sulfur, and copper sulfate are all solids, but they have different properties. D. Copp…
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1. which is the schematic symbol for a variable inductor?
C.
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copper sulfate is made up of the elements copper, sulfur, and oxygen. w…
- Second option: Copper, sulfur, oxygen, and copper sulfate all have very different properties. - Third option: Copper, sulfur, and copper sulfate are all solids, but they have di…
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fill in the blank question uncombined elemental is a bright, shiny copp…
copper
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10. according to the zeroth law of thermodynamics (teks 13a), if object…
10. B. \(A\) and \(C\) must be in thermal equilibrium. 11. B. The system released heat to surroundings. 12. A. Rate concerns how fast, while heat flow concerns how much energy is …
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formation of ionic compounds 2. how do you determine the charges on the…
The charges on ions in an ionic compound can be determined by referring to the element's position in the periodic table (for mono - atomic ions, based on group - related electron …
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formation of ionic compounds 1. why do you think the term ionic is used…
The term "ionic" is used because these compounds are formed by the transfer of electrons between a metal and a non - metal, resulting in the formation of ions (cations and anions)…
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23. calculate the value of $delta h_{rxn}^{0}$ (in kj) for the followin…
B. -1124 kJ
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5. for teks 13c, students must classify processes as exothermic or endo…
5. C. Melting of ice into liquid water ($\Delta H>0$) 6. B. Exothermic and releases 120 kJ 7. B. Changing the concentration of reactants and observing temperature change 8. C. Dou…
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identify the number of atoms on the reactant side of the chemical equat…
There are \(2\) Fe (iron) atoms. There are \(3\) O (oxygen) atoms. There are \(6\) H (hydrogen) atoms.
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count the atoms! -how many oxygen atoms are on both sides of the chemic…
4 (Since the number of oxygen atoms on both sides of the chemical equation \(CH_{4}+2O_{2}\to CO_{2}+2H_{2}O\) is 4)
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count the atoms how many hydrogen atoms are on both sides of the chemic…
\(4\)
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name: texas chemistry teks 13a - 13d exam 1. which statement best illus…
B. \(42.0^{\circ}C\)
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the 2 that was added in front of the h2o molecule is known as a coeffic…
Coefficient
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the inflation of airbags is due to the breakdown of a single chemical s…
2 Na atoms
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in the burning of magnesium chemical equation, what are the reactants? …
Magnesium (Mg) and Oxygen (O₂)
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counting atoms in chemical equations nitrogen gas reacts with hydrogen …
Nitrogen atoms: \(2\); Hydrogen atoms: \(6\)
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the law of conservation of mass states matter cannot be made or _______…
destroyed
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1. what is the isotope notation for a nucleus with 44 protons and 92 nu…
1. \(A:92\), \(X:Ru\), \(Z:44\) 2. \(52\) 3. Nitrogen 4. \(Nd\) 5. \(\#p^{+}:95\), \(\#n^{0}:141\), \(\#e^{-}:95\) 6. \(42\)
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25. calculate the lattice energy for nacl(s) using a born - haber cycle…
C. +787.2 kJ/mol
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what are the purposes of a chemical equation? check all that apply. □ t…
to help keep track of atoms in a chemical reaction, to make chemical reactions easier to recognize, to show how substances in a chemical reaction interact