Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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a 44.0 g sample of brass, which has a specific heat capacity of 0.375 j…
30.8
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what volume, in l, of water vapor will be produced when 22.0 l of h₂ an…
\( 22.0 \, \text{L} \)
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6.0 g of cream at 22.9 °c are added to an insulated cup containing 150.…
81.1 °C
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calculate the volume, in l, of a sample of an ideal gas at 5.75 atm if …
\( 2.67 \, \text{L} \)
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measurements show that the enthalpy of a mixture of gaseous reactants d…
- Change in energy: -48 kJ - Reaction type: exothermic
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a sample of gas originally occupies 17.5 l at -23.3 °c. what is its new…
\( \approx 21.8 \, L \) (or more precisely \( \approx 21.8 \) when rounded to three significant figures)
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measurements show that the energy of a mixture of gaseous reactants dec…
- Change in enthalpy: -368 kJ - Reaction type: exothermic
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assuming ideal gas behavior, which of the following variables are direc…
- amount (n) - temperature (T)
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measurements show that the enthalpy of a mixture of gaseous reactants i…
417 kJ endothermic
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a 50.3 g sample of polystyrene, which has a specific heat capacity of 1…
85
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a 56.8 g sample of aluminum is put into a calorimeter (see sketch at ri…
0.74 J/(g·°C)
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a sample of quartz, which has a specific heat capacity of 0.730 j·g⁻¹·°…
59 g
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using the table of standard formation enthalpies that youll find under …
-25
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using the table of standard formation enthalpies that youll find under …
-162 kJ
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which reactions are redox reactions? check all that apply. □ \\(\\ce{zn…
A. Zn(s) + Fe²⁺(aq) → Zn²⁺(aq) + Fe(s), B. Ca(s) + Cl₂(g) → CaCl₂(s)
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part d gaseous carbon monoxide reacts with oxygen gas to form carbon di…
$2\text{CO}(g) + \text{O}_2(g) ightarrow 2\text{CO}_2(g)$
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solid lithium oxide reacts with liquid water to form aqueous lithium hy…
$\text{Li}_2\text{O}(s) + \text{H}_2\text{O}(l) = 2\text{LiOH}(aq)$
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bromine liquid reacts with aqueous potassium iodide to form solid iodin…
$\text{Br}_2(l) + 2\text{KI}(aq) ightarrow \text{I}_2(s) + 2\text{KBr}(aq)$
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prejudice is as an evaluation of other people based on their group. thu…
C. attitude
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nitric oxide (no) can be formed from nitrogen, hydrogen and oxygen in t…
-272
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which is the best description of physiological dependence on alcohol? a…
A. An individual has a chemical need for alcohol.
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there are two steps in the usual industrial preparation of acrylic acid…
-470
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dimethyl ether, a useful organic solvent, is prepared in two steps. in …
-254
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gaseous acetylene (c₂h₂) reacts with oxygen gas to form gaseous carbon …
$2\text{C}_2\text{H}_2(g) + 5\text{O}_2(g) ightarrow 4\text{CO}_2(g) + 2\text{H}_2\text{O}(g)$
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a chemical reaction takes place inside a flask submerged in a water bat…
31.1 °C
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a chemical reaction takes place inside a flask submerged in a water bat…
30.4°C
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a chemist measures the enthalpy change δh during the following reaction…
| reaction | ΔH | | --- | --- | | 2FeCl₂(s) + 2H₂(g) → 2Fe(s) + 4HCl(g) | 314 kJ | | 3Fe(s) + 6HCl(g) → 3FeCl₂(s) + 3H₂(g) | -471 kJ | | FeCl₂(s) + H₂(g) → Fe(s) + 2HCl(g) | 157 k…
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a chemist measures the enthalpy change δh during the following reaction…
320 160 -80
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pesticides are best described as _______. a. polluting chemicals toxic …
D. toxic chemicals used to control pest populations
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hbr(aq) + o₂(g) → h₂o(l) + br₂(l) express your answer as a chemical equ…
$4\text{HBr}(aq) + \text{O}_2(g) ightarrow 2\text{H}_2\text{O}(l) + 2\text{Br}_2(l)$
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in c-14 to n-14 which is the mother isotope and which is the daughter i…
Mother Isotope: C-14, Daughter Isotope: N-14
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6/7 what type of bond is typically formed between two nonmetals? covale…
Covalent bond
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5/7 how can you determine if a bond is ionic using electronegativity di…
If the difference is greater than 1.7
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4/7 which element has the highest electronegativity on the periodic tab…
Fluorine
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3/7 what happens when two atoms with different electronegativities form…
They form a polar covalent bond
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match the mother-daughter pair to the time frame they are used to measu…
- C-14 - N-14: up to 60,000 years - U-238 - Pb-206: 1 million to 4.5 Billion years - Rb-87 - Sr-87: 100,000 to 4.5 Billion years - K-40 - Ar-40: Over 100,000 years
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na₂s(aq) + pb(no₃)₂(aq) → nano₃(aq) + pbs(s) express your answer as a c…
$\text{Na}_2\text{S(aq)} + \text{Pb(NO}_3\text{)}_2\text{(aq)} ightarrow 2\text{NaNO}_3\text{(aq)} + \text{PbS(s)}$
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2/7 which of the following is an example of a nonpolar covalent bond? h…
Oxygen (\(O_2\))
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1/7 what is the main factor that differentiates metallic, ionic, and co…
The behavior of electrons
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a concentration cell was made using a silver metal electrode in a satur…
\(7.43\times 10^{-17}\)
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question 4. using the periodic table as a guide, arrange the following …
Fluorine (F) < Sulfur (S) < Phosphorus (P) < Strontium (Sr) < Cesium (Cs)
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question 3. the atomic radius of elements as you move down a group in t…
First blank: increases; Second blank: larger; Third blank: decreases; Fourth blank: larger
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question 2. select the correct answers from the drop-down menu for each…
a) lower b) higher
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question 1. the diagram below shows a periodic table with two marked ar…
Horizontal arrow (left - right? No, the arrow is pointing left) - Decreases; Vertical arrow (bottom - top) - Increases. So for the horizontal arrow (the one moving across the peri…
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a student wishes to determine the chloride ion concentration in a water…
\(Cu^{2+}(aq)+2Ag(s)+2Cl^{-}(aq)\to Cu(s)+2AgCl(s)\)
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question 19.b of 20 a student wishes to determine the chloride ion conc…
$-22.2\ kJ$
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a student wishes to determine the chloride ion concentration in a water…
\(E^{\circ}_{cell}=0.1147\ V\)
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consider a galvanic electrochemical cell constructed using cr/cr³⁺ and …
\(0.057\ V\)
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mole map grams →× (1mol)/(grams) mole →× (6.022x10^23)/(1 mol) formula …
160.42 g CH₄
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question 18.c of 22 consider a galvanic electrochemical cell constructe…
\(2Cr^{3+}(aq)+3Zn(s)\to 2Cr(s)+3Zn^{2 +}(aq)\)
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3c. what is the molar mass of x₂y₃ if the molar mass of x = 10g/mol and…
41 g/mol
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chemical equations c₂h₅oh(l) + □ o₂(g) ⟶ 2co₂(g) + □ h₂o(l) + energy 2 …
First equation: 3 (O₂), 3 (H₂O) Second equation: Already balanced (2,2) Third equation: 2 (AgNO₃), 2 (Ag) Fourth equation:3 (BaCl₂),2 (AlCl₃) Fifth equation:2 (HI)
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3b. which is the correct way to calculate the molar mass of ab₄ if the …
1A + 4B = 5 + 4(1) = 9 g/mol
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learning target i can calculate the molar mass of a given substance 3a.…
C. 12.011
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2c. how many moles of oxygen gas (o₂) are needed to react with 5 moles …
2.5 mol O₂
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n by indicating the number of each species in the appropriate blanks. f…
3 Fe(s) + 4 H₂O(l) → 1 Fe₃O₄(s) + 4 H₂(g)
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excerpt adapted from the power and the glory by charles w. diffin there…
the professor is happy about talking to Avery.
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2b. how many moles of water (h₂o) are produced from 3 moles of oxygen g…
6 mol H₂O
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learning target i can convert between moles of one substance and moles …
2 H₂/2 H₂O
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al(s) + cl₂(g) → alcl₃(s)
$2\text{Al}(s) + 3\text{Cl}_2(g) ightarrow 2\text{AlCl}_3(s)$
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applying dalton’s law of partial pressures \\(\\frac{p_a}{p_t} = \\frac…
Gas A pressure: $\boxed{1.31}$ atm Gas B pressure: $\boxed{0.444}$ atm (Note: Depending on rounding during steps, some might get 1.30 or 0.44, but with precise calculation, 1.31 a…
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match one graph shown at right to each of the gas laws named below. cha…
Charles’s law: d) \( V \) vs \( T \) (straight line through origin) Gay - Lussac’s law: b) \( P \) vs \( T \) (straight line through origin) Boyle’s law: e) \( P \) vs \( V \) (hy…
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a gas at 300 k and 4.0 atm is moved to a new location with a temperatur…
9.2 atm
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a student tries to balance the equation by changing the subscript 2 on …
Changing the subscript on Cl from 2 to 3 would change the kind of molecules, not the number of molecules. It results in Cl₃, which does not exist as a pure substance. To balance c…
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the inside of a basketball has a pressure of 0.476 atm at 25.0°c. what …
The pressure inside the ball at \( 20.0^\circ C \) is approximately \( \boldsymbol{0.468 \, atm} \)
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a sample of neon gas at 50.°c and a volume of 2.5 l is cooled to 25°c. …
2.3 L
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a sample of carbon dioxide occupies a volume of 3.50 l at 125 kpa press…
219 kPa
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four gases were combined in a gas cylinder with these partial pressures…
Mole fraction of \(O_2\): \(\frac{2.8}{6.7}\approx0.42\) (or more precisely \(\approx0.4179\)) Mole fraction of \(Ar\): \(\frac{0.25}{6.7}\approx0.037\) (If we follow the previous…
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1c. does this particle diagram obey the law of conservation of mass? ex…
Yes, the particle diagram obeys the law of conservation of mass because the number of each type of atom (carbon, hydrogen, oxygen) is the same on the reactant and product sides.
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1b a student records the masses of two reactants (baking soda and vineg…
The bubbling indicates a gas was formed, so some mass was transferred to the air
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learning target i can explain the law of conservation of mass and apply…
- Molar Mass: The mass (in grams) of 1 mole of substance. For elements, this number can be found on the periodic table. - Mole Ratio: An expression of the relationship between the…
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match the words in the left column to the appropriate blanks in the sen…
- Observation A: new substances are formed, observation is consistent - Observation B: new substances are not formed, observation is not consistent - Observation C: new substances…
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4. how do sedimentary rocks form? a) by heat and pressure b) through er…
b) Through erosion, deposition, compaction, and cementation
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3. sedimentary rocks 4. how do sedimentary rocks form? a) by heat and p…
b) Through erosion, deposition, compaction, and cementation ### Question 5
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d) by depos 3. which of the following are types of igneous rocks? a) gr…
a) Granite, b) Basalt ### Question 4:
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2. how do igneous rocks form? a) from the cooling and solidification of…
a) From the cooling and solidification of magma or lava
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flame test element | flame description | atomic spectrum | element a | …
Claim: Unknown elements can be identified by comparing their flame test color to known elements' flame colors. Evidence: The table shows each element (A-F) has a unique flame desc…
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for each of the following element pairs determine if it is ionic, polar…
Copper & Zinc: Metallic Fluorine & Hydrogen: Polar Covalent Titanium (IV) & Selenium: Ionic, TiSe₂, 3 atoms Iron (III) & Nickel (II): Metallic Niobium (V) & Phosphate: Ionic, Nb₃(…
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unit test unit test review active 1 2 3 4 5 6 read the sentence from an…
B. The chemical waste produced by factories is dangerous, and factory owners should be held accountable.
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unit test unit test review active read the excerpt from neil degrasse t…
D. He personalizes the experience for the reader and uses vivid imagery to create a clear mental picture.
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bonding practice for each of the following element pairs determine if i…
1. Sulfur & Fluorine: Polar Covalent, $SF_6$, 7 atoms 2. Calcium & Nitrogen: Ionic, $Ca_3N_2$, 5 atoms 3. Carbon & Hydrogen: Nonpolar Covalent, $CH_4$, 5 atoms 4. Tungsten & Phosp…
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ordering the chaos of the contemporary world: an introduction to freako…
B. Feldman's payment system was largely successful.
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ordering the chaos of the contemporary world: an introduction to freako…
D. to lend credibility and additional support to their conclusion
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c. suppose a new isotope, x-32 (mass = 31.972 amu), is discovered. pred…
Incomplete information provided. Existing isotopes, their masses, and abundances of element X are needed to predict the change in average atomic mass.
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calculate $\\delta_rg^\\theta_m$, judge the spontaneity. $2ch_3oh(l) \ …
$\Delta_{r}G_{m}^{\ominus}\approx232.6\ \text{kJ·mol}^{-1}$ (Since $\Delta_{r}G_{m}^{\ominus}>0$, the reaction is non - spontaneous at 298K and standard conditions.)
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2.) when dissolved in water, glucose (corn sugar) and fructose (fruit s…
The equilibrium constant for the reaction is approximately $1.20$
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1) if the equilibrium concentrations found in the reaction: a(g) + 2 b(…
\(K_{c}\approx538\)
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12. which of the following is not true of endothermic reactions? endoth…
In an endothermic reaction, excess energy is released as heat.
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6. match each term to its definition. 1. equilibrium 2. coefficient 3. …
1. b 2. c 3. d 4. a
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5. a chemical equation is balanced by changing or adding ____. ○ coeffi…
coefficients
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4. a catalyst is essential to start a reaction, and also to ______. kee…
keep the reaction going
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2. ____ is the amount of energy that must be supplied to get a chemical…
Activation energy
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a gas - filled weather balloon with a volume of 65.0 l is released at s…
Yes
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consider the phase diagram below. what is the normal boiling point of t…
\(23^{\circ}\text{C}\) (the option with \(23^{\circ}\text{C}\), assuming the options are labeled as per the given choices, e.g., if the option with \(23^{\circ}\text{C}\) is the t…
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which phrase describes air density? ○ increases as altitude increases ○…
equals mass divided by volume
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which describes one of oxygens roles in earths atmosphere? allows fuels…
allows fuels to burn
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lesson 32 - coulomb’s law and atoms what are the subatomic components o…
neutrons, electrons, protons
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which type of workplace hazard is frequently unreported? a. infectious …
c. Harassment
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round to two significant figures. how much energy must be transferred t…
Energy transferred: $-1.6 \times 10^3\ \text{J}$; Energy released.
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when using chemicals, you should check the label select times. select t…
three (The correct option is the one labeled "three" in the dropdown menu, following laboratory safety guidelines for chemical label checking.)