Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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the histogram represents the distributions of boiling temperatures, in …
The two distributions are each nearly symmetric.
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which pure substance can be classified as an element? o h₂ o no₃ o nacl…
$H_2$
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5. in the chemical equation 2h₂ + o₂ → 2h₂o, if you have 2 moles of h₂ …
B. Neither is a limiting reactant
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ordering question click and drag on elements in order place the steps u…
1. Find the atomic masses and abundances of each isotope of the element. 2. Multiply the abundance of each isotope, expressed as a fraction, by its atomic mass. 3. Add the product…
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word synonym or ant resource information plan draft revies edit several…
| Word | Synonym or Antonym | | ---- | ---- | | resource | asset | | plan | scheme | | draft | outline | | revise | amend | | edit | redact | | several | numerous | | dialogue | c…
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act 10 word\tsynonym or antonym resource\tinformation plan draft revies…
| Word | Synonym or Antonym | |--|--| | resource | asset | | plan | scheme | | draft | outline | | revise | amend | | edit | redact | | several | numerous | | dialogue | conversat…
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this is the bohr model of an atom or ion. using the periodic table, com…
This Bohr model represents an atom of the element Li. It has a mass number of 7, 3 protons, 3 electrons and 4 neutrons and a charge of 0.
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the owner of an organic pet food store would like to analyze the sales …
15%
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name: _ 2.10 homework/exit ticket review lewis electron dot diagrams dr…
Carbon: C with 4 dots (one on each side) Chlorine: Cl with 7 dots (2 on top, 2 on the left, 2 on the bottom and 1 on the right) Nitrogen: N with 5 dots (2 on top, 1 on the left, 1…
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4. use the following data to calculate the atomic mass of gallium. show…
$69.717$ amu
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which pair of names is identical? dr. william h. schemerhorn dr. willia…
Ms. Julia P. Youngman Ms Julia P. Youngman
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question 6 (3 points) listen question 3) based on your observations for…
If the unknown is highly soluble in water and conducts electricity in solution, it is ionic. If it has low water - solubility and does not conduct electricity in solution, it is c…
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the greenhouse effect some solar radiation is reflected by the earth an…
greenhouse effect
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most substances that are not metals look dull. why? they are not mallea…
They lack luster.
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which of the following best describes bases? bases feel slippery and ta…
Bases feel slippery and taste bitter.
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which of the following is a property of metals? they are good conductor…
They are good conductors of electricity.
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question 3 (6 points) question 1) which compound melted first? what doe…
The compound that melted first was fructose. This means the interactions between its ions or molecules are weaker than those in the other compounds.
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rank the following three structures a, b and c, below, in order of thei…
A. (lowest) C < B < A (highest)
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aspirin is a crystalline molecular solid. shown below is a lewis struct…
Hydrogen bonding, dipole - dipole forces and London dispersion forces
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23. a student develops a model to show the difference between energy re…
B. smaller arrows from chemical reactions indicating less energy released than from nuclear fusion
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question 9 between glutaraldehyde and 1,5 - hexadiene, lewis structures…
Glutaraldehyde
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oximes are biochemically active molecules, some of them find uses as an…
4 hydrogen - bonds
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oximes are biochemically active molecules, some of them find uses as an…
4 hydrogen - bonds
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set 1 - generalized nucleosynthesis in a massive star elements in the s…
(3) Nucleosynthesis occurs continuously in all stars, but only massive stars form the core elements in the last stage of the stars’ life.
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methylene chloride is an important industrial solvent, its lewis struct…
polar
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plants, animals, and other organisms live in many places on earth. yet …
1. Air, water, energy from the sun. 2. They are used in manufacturing, construction, growing plants, providing food (e.g., from water bodies), etc. 3. Atmosphere: air; Biosphere: …
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the photograph above is of the annual albuquerque balloon festival. the…
The kinetic energy, K of the air molecules
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the image shows a lewis structure for the molecule anthracene, and a re…
London dispersion forces
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13. determine the ph of the acid solution after the following additions…
| Addition of 0.300 M NaOH | 0.300 M $HNO_3$ | 0.300 M $HNO_2$ | | ---- | ---- | ---- | | 0 mL | $\approx0.52$ | $\approx1.94$ | | 10.00 mL | $\approx0.82$ | $\approx3.05$ | | 15.…
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shown below are the lewis structures of two molecules (nonbonding elect…
Hydrogen bonding
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the use of parts per million (ppm) and parts per billion (ppb) allows f…
5 ppb
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14. using your work from #13, explain why the equivalence point is the …
The equivalence point is the same for both titrations because it is determined by the stoichiometry of the acid - base reaction (equal moles of acid and base reacting). The pH at …
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units such as parts per million (ppm) or parts per billion (ppb) are us…
Question 1: C. very low Question 2: C. fractions
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magnesium (mg) and iron (fe) are metals commonly used in engineering an…
Iron will be more dense by a factor of 2.30
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using a solar panel, radiant energy can be transformed into ___________…
b. electrical
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question 7 1 pts units such as parts per million (ppm) or parts per bil…
Question 7: C. very low Question 8: D. part per hundred
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a 50.0 gram aqueous sample contains 4.3 mg of salt. what is the percent…
0.0086%
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cobalt (co) is used in many engineering applications, to make specializ…
0.15 moles of cobalt
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which of the following statements is true regarding the particles in th…
The particles in a solid are in constant motion.
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which of the following also refer to the mass percentage of a component…
percent weight, percent mass, %mass, (w/w)%, %weight ### Question 2
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the active ingredient in bleach is the oxidizing agent naocl or _______…
1. C. sodium hypochlorite 2. A. mass percentage
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which of the following are mixtures? select all that apply. a. milk b. …
# Explicación: ## Paso 1: Definir mezcla Una mezcla es una combinación física de dos o más sustancias. ## Paso 2: Analizar cada opción - La leche es una emulsión, una mezcla de lí…
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passage 1 the fifteenth amendment to the united states constitution (18…
C. Despite the Fifteenth Amendment, some states had wrongly blocked people of color from voting in all elections.
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10. a 25.00 ml sample of h₃po₄(aq) requires 31.00 ml of 0.2320 m naoh f…
$0.1438\ M$
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select the correct texts in the passage. which two details, one from ea…
From Passage 1: "The right of citizens of the United States to vote shall not be denied or abridged by the United States or by any State on account of race, color, or previous con…
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1. a) draw a bohr rutherford diagram of a magnesium ion, potassium ion …
For the magnesium ion ($Mg^{2+}$): Draw a small circle to represent the nucleus with '12p, 12n' inside it. Draw two concentric circles around the nucleus. Put 2 dots on the inner …
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passage 1 the fifteenth amendment to the united states constitution (18…
"The grant to the people of the opportunity for choice is not to be nullified by a state."
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passage 1 the fifteenth amendment to the united states constitution (18…
clarifies
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base your answers to questions 4 through 6 the information below and yo…
for question 5: The arrow indicates the direction of the reaction, from reactants to products. ## Step4: Provide evidence of reaction The presence of new substances (ash, carbon d…
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which of the following is a piece of evidence in favor of the current b…
E. all of these
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what is the mass of 0.312 mol of hydrazine, n₂h₄ (molar mass = 32.06 g/…
10.0 grams ### Question 2
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the mass of 0.250 moles of c₆h₆ is ________. 19.5 grams 14.2 grams 1.53…
The mass of \(0.250\) moles of \(C_6H_6\) is: A. 19.5 grams One mole of glycine, \(C_2H_5O_2N\), weighs: A. 75.08 grams
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one mole of c₆h₆ weighs 6(12.01 g) + 6(1.01 g) or ____________. 78.12 g…
First question: A. 78.12 grams Second question: A. 2.00 moles
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if i have 12.01 grams of carbon, i know that i have 1 mole of carbon or…
First question: True Question 14: A. 6, 6
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the molar mass of any substance is equivalent to its atomic or formula …
For the first question: atomic mass units (amu) For the second question: 12.01 grams
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a mole of something is that amount in which there are ____________ of t…
First question: A. $6.02214076\times 10^{23}$ Second question: A. grams
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from column 2, select the term or phrase that best matches each item in…
14. c. acetylsalicylic acid 15. b. aspirin 16. a. Bufferin 17. d. contains information about drug products provided by pharmaceutical companies 18. f. system that adopts generic n…
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a molecular formula may be written as an empirical formula when the rat…
Question 1: A. simplest ratio Question 2: A. $C_6H_6$, B. $C_6H_{12}O_6$, E. $C_2H_4O_2$
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1. a) draw a bohr rutherford diagram of a magnesium ion, beryllium ion.…
The Bohr - Rutherford diagram of a magnesium ion ($Mg^{2+}$) has a nucleus with 12 protons and some neutrons, 2 electrons in the first shell and 8 electrons in the second shell. T…
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a(n) ____________ formula is written as the simplest whole - number rat…
Question 1: A. empirical Question 6: A. empirical
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the student conducted three experiments in order to test if water and o…
The claim that water does not result in the product of rust is incorrect. The rust - formation reaction \(4Fe + 3O_{2}+6H_{2}O ightarrow 4Fe(OH)_{3}\) shows that water is a reacta…
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the chemical formula for an ionic compound represents the types and the…
1. simplest ratio 2. $S_8$
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a molecular formula represents the types and the ______ of atoms in a g…
1. actual number 2. structural formula
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rust is produced when iron reacts with oxygen and water. the chemical f…
1. A. The reactant oxygen is a gas, while as a product oxygen is part of solid rust. 2. C. | Element | Reactants | Products | | ---- | ---- | ---- | | Iron | 4 | 4 | | Hydrogen | …
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which equation below give the proper units for the molarity of solution…
$M=\frac{\text{mol solute}}{\text{L solution}}=\frac{25.2\text{ g }CH_3CO_2H\times\frac{1\text{ mol }CH_3CO_2H}{60.052\text{ g }CH_3CO_2H}}{0.500\text{ L solution}} = 0.839\text{ …
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what are the proper units for molar concentration, m? l/mole mole/l mol…
For the first question: mole/L For the second question: $M=\frac{\text{molsolute}}{\text{Lsolution}}=\frac{0.133\ mol}{355\ mL\times\frac{1\ L}{1000\ mL}}$
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concentration of a solution may also be given in quantitative terms suc…
First question: C. Molality Second question: C. moles, liter
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solvent is the component of a solution that is present in______ amount …
1. D. greatest, lesser 2. B. dilute, concentrated
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question 2 1 pts solutions are__________ mixtures. homogeneous liquid i…
Question 2: A. homogeneous Question 3: D. solute, solvent
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when evaluating biogeochemical cycles we are focusing of how matter mov…
All of the Above
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the relative composition of a mixture plays an important role in determ…
- sugar in water: sweetness - oxygen in air: ability to sustain life - metal elements in steel: strength, weight and resistance to corrosion - amount of active pharmaceutical ingr…
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describing changes of matter you are comparing a reaction that produces…
For a chemical change: formation of new substances, color changes, gas production, heat or light release/absorption. For a physical change: change in state, shape, or size without…
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name: _ teacher: _ date: _ q1 chemistry: u2l17 unit 2 review examine th…
5. C 6. A 7. B 8. a 9. b 10. c
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calculate the concentration of sodium chloride present in mass % for a …
Question 23: C. 3.6% Question 24: D. 35 g
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a solution of 175 ml of a 1.6 m solution of licl is diluted to 1.0 l. w…
0.28 M ### Question 2
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what weight (in grams) of kcl is there in 2.50 liters of 0.500 m kcl so…
For the first question: 93.2 g For the second question: 270 mL
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a bakery has developed a new artisan bread. the staff are giving away t…
- Observe customer reactions while they taste the product. - Measure sales of the new bread after customers have sampled it.
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a solution containing 80.0 grams of glucose (c₆h₁₂o₆) is dissolved in e…
C. 1.78 M ### Question 2:
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how many oxygen atoms are present in 90.1 g of glucose (c₆h₁₂o₆)? 6.02 …
For the first question: $18.1\times10^{23}$ For the second question: $0.079\ M$
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question 13 1 pts how many moles in 510.0 g of al₂s₃? 4.318 mol 5.604 m…
Question 13: 3.396 mol Question 14: 10.19 mol
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how many grams constitutes 3.00 moles of co₂? 132 g 84.0 g 168 g 14.7 g…
First question: A. 132 g Second question: C. 1.99 mol
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research the top chemist of the week: mario molina. type your responses…
1. Mario Molina was born in 1943 and died in 2020. 2. He lived in places such as Mexico City and the United States. 3. He worked at the University of California, Irvine. 4. He is …
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whether or not two substances are miscible can be generally be predicte…
D. like dissolves like ### Question 2
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nonpolar solvents will tend to dissolve nonpolar solutes low molecular …
Question 1: nonpolar solutes Question 2: sugar and methanol, carbon tetrachloride and methane, methanol and water
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hydrocarbon compounds, are comprised of carbon and hydrogen and have a …
1. A. negligible 2. A. polar solutes
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the primary intermolecular forces that allows ethanol to readily dissol…
For the first question: Hydrogen bonding For the second question: Hydrogen bonding
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which of the following mixtures are solutions? (pick all that apply) oi…
Question 1: - Nitrogen gas and oxygen gas - Sugar and water - Sodium chloride and water - Oxygen gas and water - Stainless steel (a mixture of iron and chromium) Question 2: Ion -…
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describing changes of matter when fat comes in contact with sodium hydr…
This is a chemical change because new substances (soap and glycerin) are formed when fat reacts with sodium hydroxide.
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7. calculate the ph of each solution after the addition of 0.010 mol hc…
1.40 ### b. 250.0 mL 0.10 M NaOH
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apply 3. how many valence electrons does magnesium (mg) have? 2 4. how …
3. Magnesium (Mg) has 2 valence electrons. 4. Sulfur (S) has 6 valence electrons. 5. Neon (Ne) has 8 valence electrons. 6. Neon (Ne) does not form bonds.
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e) $_{95}^{241}am ightarrow _____+_{93}^{237}np$
$_{2}^{4}He$
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4) below and on the following page, determine if each picture is an ele…
1. Element(s) 2. Element(s)
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question 10 1 point when solutions of nitric acid and sodium hydroxide …
A. hydrogen ion C. hydroxide ion
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an aqueous solution is: a water with a molecular compound dissolved in …
D. water with another compound dissolved in it.
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considering the following precipitation reaction: pb(no₃)₂(aq) + 2ki(aq…
A. $K^{+}$ and $NO_{3}^{-}$
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a reaction which forms a solid product is an example of a(n): a gas evo…
C. precipitation reaction
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how many of the following salts are expected to be insoluble in water? …
D. none
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aqueous solutions of potassium sulfate and ammonium nitrate are mixed t…
E. No reaction will occur.
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if you had an aqueous mixture that contained ag⁺, k⁺, and pb²⁺ cations,…
D. 2
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which of the following compounds is insoluble? a magnesium bromide b al…
B. aluminum sulfide