Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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what makes up the atomic mass? a. electrons + neutrons b. electrons + p…
C. protons + neutrons
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the number of protons is equal to... a. the atomic mass. b. the number …
B. the number of electrons.
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a gas has a henrys law constant of 7.80×10⁻⁴ m/atm at 18.3 °c. what vol…
106 L
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a metal, m, of atomic mass 56 amu reacts with chlorine to form a salt t…
The formula of the salt is $MCl_2$.
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an aqueous solution is saturated in both oxygen gas and potassium iodid…
Potassium iodide will crystallize out of the solution, and no oxygen gas will bubble out.
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determine the vant hoff factor (i) for the following solutions. assume …
$1.128\ M\ \ce{C2H5OH}: i = 1$ $0.30\ M\ \ce{NaCl}: i = 2$ $0.052\ M\ \ce{CaBr2}: i = 3$ $0.073\ M\ \ce{Mg(NO3)2}: i = 3$
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the equation used to calculate the change in freezing point ($delta t_{…
As the temperature of a solution changes, its volume will also change, which will affect its molarity but not its molality.
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when sodium carbonate, na₂co₃, dissolves in water, what ions are produc…
$2Na^{+}+CO_3^{2 -}$
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# protons # electrons # neutrons
# protons: 16 # electrons: 16 # neutrons: 16
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an aqueous sodium acetate, nac₂h₃o₂, solution is made by dissolving 0.4…
$0.659$
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36 kr krypton 83.798 # protons ____ # electrons ____ # neutrons ____
# protons: 36 # electrons: 36 # neutrons: 48
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calcium (ca) is in the second column of the periodic table and is class…
C. $CaI_{2}$
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what would be the correct balanced formula for a compound made from alu…
C. $Al_2S_3$
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what is the metallic ion in the compound cucl₂? a. cu² b. cu` c. cu⁺ d.…
D. Cu²⁺
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each of the identical volumetric flasks contains the same solution at t…
A. molarity
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when one mole of sodium bicarbonate is formed from its elements, 947.7 …
The correct chemical equation representing the formation of one mole of sodium bicarbonate from its elements with the release of 947.7 kJ of energy is \(Na(s)+\frac{1}{2}H_{2}(g)+…
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each of the identical volumetric flasks contains the same solution at t…
A. molarity
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which of the following best describes the properties of an ionic compou…
C. high melting point, tendency to transfer electrons, electrolyte
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the melting point of water is 0°c. which statement best predicts whethe…
C. Water is more likely a covalent compound because water has a low melting point.
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1 waters chemical formula is h₂o. what does this mean? (a) water is mad…
A. Water is made up of H₂O molecules
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what leads to the formation of a covalent bond? a. the transfer of elec…
B. the sharing of an electron pair
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the thermochemical equation that represents the molar enthalpy of forma…
A. $C_2H_5OH(l)+277.1\ kJ ightarrow2C(s)+3H_2(g)+\frac{1}{2}O_2(g)$ (re - written in the form showing the formation of ethanol from its elements with the correct enthalpy value)
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insert dashes where needed. at sunfest organic farm a cutting - edge he…
At Sunfest Organic Farm - a cutting - edge herb farm in Okeechobee, Florida - the herbs are washed with ultraviolet light in a vacuum - sealed room.
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assuming equal concentrations and complete dissociation, arrange these …
Highest freezing point: $NaNO_3(aq)$ $K_2SO_4(aq)$ $K_3PO_4(aq)$ Lowest freezing point: $Al_2(SO_4)_3(aq)$
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based on the location of the elements magnesium (mg) and bromine (br) i…
It has a high melting point.
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for each solute, identify the better solvent: water or hexane. water, h…
$N_2$: Hexane $NaCl$: Water $CH_3NH_2$: Water $SO_2$: Water $C_7H_{16}$: Hexane
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identify the principal type of solute - solvent interaction in a soluti…
1. C. dispersion forces 2. A. ion - dipole interactions
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compound boiling point (k) nacl 1,738 pcl3 349 co2 195 libr 1,538 cao 3…
Boiling points for ionic compounds are higher than boiling points for covalent compounds.
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identify the principal type of solute - solvent interaction in a soluti…
1. C. hydrogen bonding 2. D. ion - dipole interactions
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the enthalpy of solution of nacl in water is about 3.88 kj/mol. however…
the entropy increases when NaCl dissolves in water
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select two of the following compounds that are covalent. a. cacl₂ b. p₂…
B. $P_2O_5$
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question 4 of 29 calculate the vapor pressure of benzene, c₆h₆, at 25 °…
$P_{benzene}=73.92$ torr $P_{toluene}=6.21$ torr
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calculate the boiling point ($t_{b}$), in degrees celsius, for a soluti…
$104.11^{\circ}C$
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the diagram models a type of bond between atoms. which best describes t…
Covalent bond
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what leads to the formation of a covalent bond? a. the transfer of elec…
B. The sharing of an electron pair
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two balloons hold two different gases. the gases are held at the same p…
the mass of each gas
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extension: the periodic table get the gizmo ready: - create a neutral h…
1. The elements are arranged by increasing atomic number, which shows trends in their properties. 2. H: 1 dot; He: 2 dots; Li: 1 dot; Be: 2 dots; B: 3 dots; C: 4 dots; N: 5 dots; …
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activity b: electron arrangements get the gizmo ready: * create a neutr…
1. Electrons are arranged in energy levels around the nucleus. 2. A. 2 B. 8 C. 8 3. 1 4. One dot around the symbol Li. 5. For H: One dot around the symbol H. For He: Two dots arou…
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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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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…
37.7
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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 z is 0.9237 g/ml. a student masses a cup with a s…
$37.8$
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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