Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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in an experiment you are asked to react hydrochloric acid with sodium h…
100 mL Graduated cylinder
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medium sound waves must have a medium to travel through. in outer space…
1. Sound waves must have a medium to travel through because they are mechanical waves that rely on particle - to - particle interaction for propagation. 2. In outer space there ar…
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medium sound waves must have a medium to travel through. in outer space…
cannot
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3. theme cause and effect based on my observations in part iii, water (…
Water sticks to itself (cohesion) and sticks to other substances (adhesion). Evidence: Water forms a meniscus in a glass tube showing adhesion to glass, and water droplets form on…
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consider the reaction of production of nitrogen monoxide from nitrogen …
Causes the concentration of NO to increase and the concentration of $N_2$ and $O_2$ to decrease: adding $N_2$, adding $O_2$, removing $NO$, heating up the reaction mixture Causes …
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fill in the missing words a double arrow in the chemical equation indic…
1. reversible 2. remain constant
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fill in the missing words for the reaction $hgs(s)+o_2(g) ightleftharpo…
spontaneous; non - spontaneous
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multiple choice question moseley improved the pattern of properties in …
atomic number
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fill in the missing words use a thermochemical reaction of the reaction…
a) 420; 210 b) 420
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due sunday by 11:59pm points 10 submitting an external tool fill in the…
During an endothermic reaction the temperature of the reaction mixture decreases. During an exothermic reaction the temperature of the reaction mixture increases.
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1. ¿cuándo y por qué se deben utilizar gafas de seguridad? 2. ¿qué hace…
Se deben utilizar gafas de seguridad en actividades donde existan riesgos para los ojos, como en laboratorios de ciencia (manipulación de productos químicos, experimentos), trabaj…
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which of these compounds might be an ingredient in commercial sunscreen…
The first compound (with the phenolic ring, ester, and alkyl chain) and the second compound (with two aromatic rings, a phenolic - OH, and a methoxy group) are the ones that might…
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select the correct answer. why might two elements possess similar chemi…
A. They belong to the same group of the periodic table.
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name these organic compounds: table with two columns: structure (contai…
| structure | name | |--|--| | | bromobenzene | | | Bromobenzene | | the ratio of total mass of the solute to the tot…
c) mass percentage
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question 9 (2 points) which of the following substances are completely …
b) ethanol and water
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question 8 (2 points) a dispersion of one liquid phase in another liqui…
d) emulsion
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question 7 (2 points) the particles in a colloid scatter a beam of visi…
e) Tyndall
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question 6 (2 points) pressure has an appreciable effect on the solubil…
c) gases
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name these organic compounds: structure image of a benzene ring with a …
1 - bromo - 3 - fluorobenzene
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question 5 (2 points) the relationship between the pressure and the sol…
b) Henry's
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question 4 (2 points) the molality of a solution that contains 36.6 g o…
b) 3.13
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question 3 (2 points) the decrease in vapor pressure of an aqueous solu…
c) 614
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question 2 (2 points) the solubility of o2 in 100 g of water at 10.0 °c…
d) \( 1.7 \times 10^{-3} \)
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question 1 (2 points) formation of solutions where the process is endot…
c) they are accompanied by an increase in disorder
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27 soit la réaction suivante: mg$_{(s)}$ + 2 hcl$_{(aq)}$ $\ ightarrow$…
The volume of HCl solution is approximately \( 0.165 \, \text{L} \) (or \( 165 \, \text{mL} \))
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part b what is the mass, in kilograms, of a person who weighs 137 lb? e…
Value: \( 62.1 \), Units: kilograms (or \( kg \))
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exercices 1. suis-je un atome (a) ou une molécule (m)? spécifie le nomb…
A (1 atome) #### Part c) \( O_4 \)
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a container holds 0.340 qt of liquid. how many milliliters of lemonade …
Value: 322, Units: milliliters (or mL)
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perform each of the following conversions using metric conversion facto…
\(0.0427\space L\) ### Part B
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question 21 of 21 (1 point) | question attempt: 2 of unlimited structur…
To name these substituted benzene compounds, we use the IUPAC nomenclature for disubstituted benzenes (or use prefixes for multiple substituents) and consider the positions (ortho…
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name these organic compounds: table with two columns: structure (contai…
1. o - xylene (or 1,2 - dimethylbenzene) 2. o - bromochlorobenzene (or 1 - bromo - 2 - chlorobenzene) 3. o - dibromobenzene (or 1,2 - dibromobenzene)
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7. the disproportionation of p-toluenesulfonic acid is shown below: 3 a…
### Part (a) # Explanation: ## Step1: Recall second - order kinetics formula For a second - order reaction with a single reactant \(A\), the integrated rate law is \(\frac{1}{[A]_…
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e. circle the number in this entry from the periodic table that gives t…
Circle the number 6. ### Part f
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use the following table of bond energies to calculate the molar enthalp…
\(-1222\)
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determine the enthalpy of the reaction of \\ce{p4o10(s) + 6 pcl5(g) -> …
The enthalpy of the reaction is $\boxed{-610.3\ \mathrm{kJ/mol}}$
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3. answer each of these questions about protons. a. where in the atom a…
Protons are found in the nucleus of an atom. ### Part b
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comparing reactivity of different nonmetals rank the nonmetals in each …
Bromine: 2 Chlorine: 1 Iodine: 3
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using the equations \\ce{h2(g) + f2(g) -> 2 hf(g)} \\quad \\delta h^\\c…
\( \boxed{71.8} \) (in kJ/mol)
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sample response: lorenzo is not correct. nonmetals increase in reactivi…
- Nonmetals on the right need to gain fewer electrons to form an ion, so they are more reactive. - The noble gases already have a full outer shell. - The noble gases break the tre…
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comparing differences in period lorenzo is making a prediction. \i lear…
Lorenzo is not correct. The trend of nonmetals increasing in reactivity from left to right across a period does not apply to noble gases (like xenon). Noble gases have a full vale…
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which nonmetals have similar chemical properties? check all that apply.…
A. sulfur, C. selenium, D. oxygen
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question 20 (5 points) what mass of carbon monoxide is produced when 1.…
a) 84.0 g
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classifying nonmetals by group identify whether each element is a halog…
halogen ### Nitrogen (N)
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question 19 (5 points) which of the following is not an assumption unde…
b) During a collision, energy is lost by the gas particles and later is regained.
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question 19 (5 points) which of the following is not an assumption unde…
b) During a collision, energy is lost by the gas particles and later is regained.
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question 18 (5 points) a pressure of 1030 torr is equal to ______. a) 0…
c) 1.36 atm
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question 17 (5 points) which of the following reactions will not result…
d) aqueous solution of sodium sulfate added to a solution containing ammonium iodide
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question 16 (5 points) what is the concentration of an hbr solution if …
b) 0.31 M
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question 15 (5 points) combining sodium hydroxide and hydrochloric acid…
a) sodium chloride
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question 14 (5 points) what is the molarity of a solution in which 4.00…
a) 1.33 M
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question 13 (5 points) with each breath of air, you inhale 4.50 × 10²³ …
b) 20.9 g
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question 12 (5 points) elements of group 6a generally form ions with a …
d) -2
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question 11 (5 points) what is the ph of a 0.01 m solution of hcl? a) 0…
d) none of these choices
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question 10 (5 points) how many molecules of o2 will be required to rea…
c) \(1.81\times10^{23}\) molecules
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question 8 (5 points) the following reaction is an example of ______. n…
d) double - displacement
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student name: ______________________________ date: ___________________ …
This is a worksheet for creating Bohr models and Lewis dot structures of elements, likely for a chemistry (Natural Science subfield) class. To complete it: ### Step 1: Determine t…
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question 6 (5 points) in the following reaction, water behaves as ch3nh…
a) an acid
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question 5 (5 points) what is the total concentration of ions in a 0.10…
c) 0.30 M
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question 3 (5 points) what is the mass of 0.360 mol of hcl? a) 0.360 g …
b) 13.1 g
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question 2 (5 points) how many significant figures should be included i…
a) 2
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question 1 (5 points) how many orbitals are contained in the 2p subleve…
c) 3
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how many orbitals are contained in the 2p sublevel? a) 1 b) 2 c) 3 d) 4…
c) 3 ### Question 2:
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question 2 (5 points) which of the following is not one of the properti…
c) It has low conductivity.
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identifying nonmetals by location on choose the nonmetallic elements fr…
oxygen, boron, argon, carbon
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comparing reactivity of different nonmetals rank the nonmetals in each …
Neon: 3 Selenium: 2 Fluorine: 1
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part ii. for each of the following isotopes, write the number of proton…
### First, let's handle Chromium - 63: #### Step 1: Determine the number of protons For an element, the number of protons is equal to its atomic number. Chromium has an atomic num…
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choosing the appropriate property a sample of iodine is easiest to ship…
First blank: brittle Second blank: brittle Third blank: thermally insulating
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a sample of iodine is easiest to ship as a powder because it is │││││││…
brittle ### Second Blank (Helium):
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nonmetallic elements form ions by □ valence electrons to complete their…
1. gaining 2. more 3. fewer 4. increases 5. decreases
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predicting properties based on the periodic table complete each stateme…
1. The noble gases are the least \boxed{reactive} of any elements on the periodic table. 2. The \boxed{halogens} form acidic compounds with hydrogen. 3. The halogens are the most …
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(10pts) give the iupac names for the following compounds a (structural …
s: - Compound D: 2,3 - dimethylpentane - Compound E: (Assuming correction, if the formula is $\ce{(CH3)3COCH2CH2CH(CH3)OCH2CH3}$, the name would be 1 - (tert - butoxy) - 3 - ethox…
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which properties are characteristics of nonmetals? check all that apply…
The properties that are characteristics of nonmetals are: - brittle - solid at room temperature (for some nonmetals like carbon, sulfur) - low density - electrical insulator In bo…
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the substance in the image is called dry ice. it is a solid that, witho…
B. with the nonmetals
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question 3 4 pts 1) 0.555 g - 0.34 g = select g 2) 6.845 g / 0.59 ml = …
s: 1. \( 0.215 \, \text{g} \) 2. \( 11.6 \, \text{g/mL} \) (or more precisely \( 11.6017 \, \text{g/mL} \))
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1) 0.555 g - 0.34 g = select g 2) 6.845 g / 0.59 ml = select g/ml
\(0.2155\space g\) ### 2)
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(3pts) with your model set construct butane, c₄h₁₀. draw the expanded, …
To solve this, we construct the formulas for butane ($C_4H_{10}$) as follows: ### 1. Expanded Formula Draw 4 carbon atoms in a horizontal chain, each connected by single bonds. At…
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(3pts) with your model set construct butane, c₄h₁₀. draw the expanded, …
Yes
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which of the following best matches the description? burning of fuel to…
k. combustion
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a base is the opposite of an acid in that it accepts ______ in a soluti…
b. hydrogen ions
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water vapor, liquid water, and ice all have the same chemical compositi…
b. molecules.
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which of the following best matches the description? number used as a m…
p. pH
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6. five ml of ethanol has a mass of 3.9 g and 5.0 ml of benzene has a m…
Benzene is denser.
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which of the following best matches the description? molecule or atom w…
b. ion
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a scientist studies the effect of adding different amounts of salt on t…
Independent variable: Mass of Salt Added (g) Dependent variable: Boiling Temperature (°C)
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environmental problems do not necessarily coincide with select one: ○ a…
d. organic chemistry
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which is an example of making a quantitative observation? measuring the…
A. measuring the mass of metal used in a reaction
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which is an example of making a qualitative observation? ○ measuring th…
B. describing how copper changes color in chlorine
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a(n) □ □ diagram uses the chemical symbol of an element surrounded by d…
Lewis, dot (or Lewis, electron - dot)
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select all that apply the second row of the periodic table ______. □ in…
- has elements with two occupied energy levels. - ends with the noble gas neon. - includes eight elements.
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chlorine is a gas that reacts with metals to form salts. based on perio…
bromine below it
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scientists look for quarks by analyzing data from ______. ○ elements he…
D. high speed collisions between particles
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which particles in an atom carry an electric charge of 1–? options: neu…
B. electrons
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the sum of the number of protons and the number of neutrons in the nucl…
C. mass number
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we have been exceptionally productive at work since we got the new vide…
C. channel
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cohesion vs. adhesion ★ cohesion ____________________ _________________…
To solve the fill - in - the - blanks related to cohesion and adhesion of water, we analyze the concepts: ### For the "Cohesion" section: - Cohesion is the attraction between mole…
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question 8 (10 points) which process describes to removal of material f…
2) debridement ### Question 9
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social hx: 1-pack-per-day smoker, social drinker: 3-4 glasses of wine a…
2) Her fibrous skin tumors were removed by freezing.
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read this patients treatment plan: i will begin her on topical corticos…
2) Removal of a nail