Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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complete the sentence with the pronoun that agrees with the word or wor…
It
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activity a: subatomic particles get the gizmo ready: - use the arrows t…
A. Atomic number B. $N = A - Z$ C. Proton; Neutron; Electron 3. A. Carbon - 12, Carbon - 13 B. Nitrogen - 14, Nitrogen - 15 C. Oxygen - 13, Oxygen - 15 4. A. 3 B. 13 C. 12 D. 10 E…
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what is important when working with corrosive chemicals? click on the r…
c) Wear a lab coat and gloves.
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gizmo warm - up atoms are tiny particles of matter that are made up of …
A. Protons and neutrons B. Electrons 2. The number of protons in the nucleus
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vocabulary: atom, atomic number, electron, electron dot diagram, elemen…
1. Flour, cheese, tomato sauce, meats, vegetables. 2. Hydrogen and oxygen. 3. Iron.
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a flashlight uses the chemical energy stored in a battery. the chemical…
C. thermal and electrical
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complete the sentence with the pronoun that agrees with the word or wor…
her
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english poets began to imitate the italian sonnet giving the english wo…
1. abba abba cdcdcd 2. Line 9 3. 10 4. The speaker laments going blind early and fears God's rebuke for not using his talent. 5. God doesn't need man's work, and those who wait pa…
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matter is made up of tiny particles called ____________. a. mass b. mix…
C. molecules
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question 5 1 pts a chemist recorded the change in temperature of a cool…
$-17^{\circ}F$ per minute
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part 2d 3 marks choose 3 of 4 (lesson 2b) draw the lewis dot diagrams o…
a) For Polonium (Po): Write 'Po' and place 6 dots around it. b) For Radon (Rn): Write 'Rn' and place 8 dots around it. c) For Strontium (Sr): Write 'Sr' and place 2 dots around it…
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question 6 of 10 a vibrating object pushes the molecules together and c…
A. True
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what is the missing particle? 34 15 p → ? + 34 16 s 4 2 he -1 0 e 0 -1 e
$_{-1}^0e$
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question 20 (1 point) the chemical formula for butyne would be c₄h₈ c₄h…
Question 20: B. $C_4H_6$ Question 21: B. 2 - butene
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question 18 (1 point) hexane, 2,3 - dimethylbutane, and 2 - methylpenta…
Question 18: hexane > 2 - methylpentane > 2,3 - dimethylbutane Question 19: pentene
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question 16 (1 point) which of the following are saturated hydrocarbons…
C. alkanes
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question 12 (1 point) which of the following is not a constitutional (s…
C. cyclopentane
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according to the common bonding patterns for atoms, halogen atoms typic…
3
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which formula represents an inorganic compound? cacl₂ ch₃nhch₂ch₃ ch₃co…
$CaCl_2$
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question 30 (1 point) listen which compound has the lowest boiling poin…
$CH_3(CH_2)_4CH_3$
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question 29 (1 point) what is the iupac name of the compound shown belo…
E. 2 - pentoxynonane
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which compound can be oxidized to a carboxylic acid
The third compound (the straight - chain alcohol with -OH at the end)
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question 27 (1 point) what is/are the carbonyl product(s) formed when t…
None of the above options are correct as no carbonyl products are formed.
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question 4 not yet answered marked out of 1.00 flag question when an at…
A. have no overall charge.
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atoms with fewer electrons in the valence ring are the best conductors,…
True
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which statement describes carbons unique bonding ability? carbon can on…
Carbon can easily form 4 covalent bonds with other atoms.
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which molecules are considered organic? those containing phosphorus tho…
those containing carbon
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an atom with more electrons than protons has an overall positive charge…
False
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when one mole of sodium bicarbonate is formed from its elements, 947.7 …
$\text{Na}(s)+\frac{1}{2}\text{H}_2(g)+\text{C}(s)+\frac{3}{2}\text{O}_2(g) ightarrow\text{NaHCO}_3(s)+947.7\text{ kJ}$
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every atom has a ______, with at least one positively charged ______ an…
B. Nucleus; proton; neutron
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which statement best explains why carbon is present in so many kinds of…
It can form four covalent bonds.
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1. atomic number is based on the number of these subatomic particles in…
1. Protons 2. Electrons 3. Electrons 4. Electrons 5. Electrons 6. Electrons 7. Electrons 8. Neutrons
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the density of liquid z is 0.9237 g/ml. a student masses a cup with a s…
$37.8$
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calculate the percent ionization of a weak acid with a concentration of…
4.6%
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an acid exhibits a 99.9% ionization. is this a strong or weak acid? its…
B. Weak acid! The acid doesn't completely dissociate.
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an acid exhibits a 5.2% ionization. is this a strong or weak acid? its …
Weak acid! The acid doesn't completely dissociate.
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an acid exhibits a 1.25% ionization. is this a strong or weak acid? str…
B. Weak acid! The acid doesn't completely dissociate.
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calculate the percent ionization of a weak acid with a concentration of…
C. 0.41%
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a 6.0 m base produces 0.25 m $oh^-$ in solution. is this a strong or a …
Weak base! The concentration of $OH^-$ is significantly less than the concentration of the base.
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a 6.0 m base produces 0.25 m oh⁻ in solution. is this a strong or a wea…
Weak base! The concentration of $OH^-$ is significantly less than the concentration of the base.
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a 6.0 m base produces 6.0 m oh⁻ in solution. what is the percent ioniza…
D. 100%
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a 6.0 m base produces 0.25 m oh⁻ in solution. what is the percent ioniz…
C. 4.2%
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a 2.5 m acid produces 0.035 m h⁺ in solution. is this a strong or a wea…
B. Weak acid. Only a small proportion of the acid dissociates to produce H⁺.
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100 compounds of the weak base $nh_3$ with 100 molecules water will be …
Around 95 $NH_3$, around 95 $H_2O$, around 5 $NH_4^+$, and 5 $OH^-$ ions in solution
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how do the muscles help in thermoregulation? muscles produce oil that b…
Muscles contract rapidly, producing heat.
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unknown liquids data sample indicator color change identification unkno…
A. Sample ### 10.
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the density of liquid a is 1.0240 g/ml. a cup with a sample of liquid a…
32.56
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which of these uses pathos? a. all of the other schools in our district…
B. We are starving because the food, if you can call this slop "food," at our school is not fit for the lowest grub on this fine Earth!
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how many neutrons are in potassium? type the number.
20
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multiple - meaning words in context the noun plant is a multiple - mean…
6. He struck the table with his hand in anger. 7. She received a beautiful present on her birthday. 8. The problems in the present require immediate attention.
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24 multiple choice 3 points what makes proteins different from carbohyd…
D. Proteins contain Nitrogen and the others do not.
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fill in the blank 3 points what is known as \the universal solvent\? ty…
# Breve explicación: El agua es conocida como el solvente universal debido a su capacidad para disolver una amplia variedad de sustancias gracias a su estructura molecular polar. …
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finish the statement by adding the correct word. a substance that measu…
ácido
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from the answer choices below select all of the things you can determin…
- If something is acid - If something is alkaline - If something is neutral
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19 fill in the blank 3 points pure, distilled water would measure ____ …
7
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what is the atomic mass of nitrogen? type the number.
# Explicación: ## Paso1: Identificar la masa atómica en la tabla periódica La masa atómica de nitrógeno está indicada como 14.0067. # Respuesta: 14.0067
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what is defined as two or more elements chemically combined? element ne…
# Breve explicación: Un elemento es una sustancia química que no se puede descomponer en sustancias más simples por métodos químicos ordinarios. Un neutrón es una partícula subató…
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how many protons are in an atom of uranium - 235? 92 235 143 327
92
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how many protons does carbon have? type the number.
# Breve explicación: El número atómico de un elemento representa la cantidad de protones en su núcleo. El símbolo químico del carbono es C y su número atómico es 6, lo que signifi…
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unit 3 chem l test 2526 how does the radioactive isotope c - 14 differ …
It has the same number of protons and two more neutrons than C - 12.
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unit 3 chem l test 2526 which statement about the mole is true? a mole …
D. All of the above
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55.7 grams of calcium (ca) = ______ moles of calcium calcium 20 ca 40.0…
1.39 moles of Calcium
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unit 3 chem l test 2526 convert 2.5 moles of tin (sn) into atoms of tin…
1.5×10²⁴ atoms
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unit 3 chem l test 2526 which of the following would best be measured i…
particles of sand on the beach
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unit 3 chem l test 2526 what is the molar mass of iron (fe)? 26 g/mol 8…
C. 55.845 g/mol
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an electron in which energy level would have the most energy? 1st energ…
B. 3rd energy level
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which experiment lead to the discovery of the atomic nucleus? thomson -…
C. Rutherford - Gold Foil
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table 6 - 1 gives information about the nuclei of four atoms. how many …
2 (corresponding to the first option in the multiple - choice list)
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three naturally occurring isotopes of neon exist. looking at the period…
Neon - 20
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how many neutrons are in an atom represented by $_{88}^{220}ra$? 308 13…
B. 132
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the of an atom is extremely dense. it has a very small and a large time…
The first blank: nucleus; The second blank: volume; The third blank: mass
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an element has two naturally - occurring isotopes. isotope a has a mass…
63.6
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unit 3 chem l test 2526 figure 6 - 13 is a diagram of which element? he…
oxygen
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part 3 isotopes: use the information filled into the table to help you …
1. An atom is the basic unit of an element. Isotopes are atoms of the same element with different neutron numbers. 2. They have the same number of protons and electrons (in neutra…
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list the three main subatomic particles in alphabetical order below.
1. electrons 2. neutrons 3. protons
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unit 3 chem l test 2526 figure 6 - 8 represents the nucleus of an atom.…
The atomic number is 9 and the mass number is 20.
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figure 6 - 14 shows a boron atom. w = nucleus, x = neutrons, y = proton…
C. Letter Y
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unit 3 chem l test 2526 which of the following has a positive charge? n…
C. protons
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in 1803, the english chemist john dalton formulated an atomic theory be…
2
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question 10 2 pts a metal sphere weigh 2.403 g is added to 15.0 ml wate…
1.4 g/mL
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unit 3 chem l test 2526 which set of atomic models shows the correct or…
The last option (golden sphere, red cross - circle, white circle with central mass and some dots, white circle with orbiting electrons around central mass, blue cloud - like) show…
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what determines a minerals unique characteristics? o age and location w…
D. Chemical composition and crystal structure
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which of the following subatomic particles gives the nucleus of an atom…
D. both protons and neutrons
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the are located in group 18 and have such a lack of reactivity with oth…
noble gases
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unit 3 chem l test 2526 which of the following subatomic particles are …
B. electrons
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post lab quiz - determining the density of a solid and liquid started: …
Precisely fill a tared volumetric flask with liquid and record the mass.
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unit 3 chem l test 2526 which subatomic particle gives the atom its ide…
protons
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unit 3 chem l test 2526 which of the following has a negative charge? ○…
electrons
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zzes > post lab quiz - determining the density of a solid and liquid la…
B. graduated cylinder
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post lab quiz - determining the density of a solid an started: sep 16 a…
B. g/mL
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go to www.periodictable.com and hover over each of the crystallogens. w…
Please visit www.periodictable.com, hover over each Crystallogen and record 2 - 3 interesting facts as per the instruction. No specific facts are provided here as they need to be …
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chlorine determine the ionic name. ion write the chemical symbol and ch…
Ion name: Chloride Chemical symbol and charge: $Cl^-$, - 1 Ionic charge of - 1 is achieved when the atom gains 1 electron.
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enthalpy changes for solids and liquids example 3 - 6: 20.0 g of nh4no3…
\(21.1\text{ kJ/mol}\)
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selenium determine the ionic name. write the chemical symbol and charge…
Ionic name: Selenide Chemical symbol and charge: $Se$, $2 - $ The ionic charge of $Se^{2 - }$ is achieved when the atom gains 2 electrons.
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atoms, ions, and isotopes part 1 vocab: use the word bank to answer the…
See the above - filled tables and explanations for all parts.
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group #: 2 draw the example atom and make the outermost electron(s) in …
Group #: 14 Family Members: C (6), Si (14), Ge (32), Sn (50), Pb (82), Fl (114) Uses/Existences: 1. Carbon - basis of organic compounds, used in fuels. 2. Silicon - in semiconduct…
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according to the concept of entropy, what will likely happen to most mo…
They will break down.
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calculate the following using proper number of significant figures: 0.0…
B. 0.0520
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which property of water is best described as the tendency of water mole…
B. cohesion
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atoms, ions, and isotopes part 1 vocab: use the word bank to answer the…
1. An atom is neutral; an ion is charged due to gain or loss of electrons. 2. Both have protons, neutrons in the nucleus and are composed of sub - atomic particles. 3. For neutral…