化學
化學反應、化學計量、分子結構與元素性質。
-
question 42 given the following tabulated data, calculate the enthalpy …
-3119 kJ (corresponding to the option " -3119 kJ")
-
which of the following represents a formation equation for $\\ce{c6h12o…
6 C(s) + 6 H₂(g) + 3/2 O₂(g) ⟶ C₆H₁₂O₆(s) (the second option in the list)
-
which of the following represents a formation equation for c₆h₁₂o₆(s)? …
\( 6\ce{C(gr)} + 6\ce{H2(g)} + 3\ce{O2(g)} ightarrow \ce{C6H12O6(s)} \) (the fourth option)
-
atoms of which element will contain 18 neutrons? * 18 ar argon 39.95 9 …
Chlorine (the option with the Chlorine tile, or the third option in the layout: the one with atomic number 17, symbol Cl, name Chlorine, and atomic mass 35.45)
-
write the formulas for the following compounds: ionic compounds: do not…
| Compound | Ions/Anion/Prefix Analysis | Formula | Ionic/Covalent/Acid | |-------------------|----------------------------|---------------|---------------------| | calcium bromid…
-
lead, water, sulfur, and arsenic have specific heats of 0.128, 4.184, 0…
A. water
-
the (balanced) exothermic reaction shown below is used by railroad crew…
28.3 g
-
how many protons, neutrons, and electrons are there in an atom with an …
A. 55 protons, 80 neutrons, 55 electrons
-
write the formula for the following compounds: ionic compounds: do not …
The formulas and classifications for each compound are as shown in the above table.
-
what volume of 0.500 m koh is needed to completely neutralize 125.0 ml …
375 mL
-
what volume of solution (in ml) is needed to dilute a 2.0 m hi solution…
3.75 mL
-
what is the molarity of a 750.00 ml solution which contains 164.5 g of …
1.544 M
-
identify the elements in the following reaction: 2 k + f₂ ⟶ 2 kf ○ oxid…
C. oxidized: K; reduced: \( \text{F}_2 \) (Note: Using option label as per the third choice in the list: "oxidized: K; reduced: \( \text{F}_2 \)")
-
what is the oxidation number of nitrogen in nh₄cl? -3 +3 +2 0
-3 (corresponding to the option with -3)
-
identify the strong base in the following reaction and predict the prod…
The correct option is: \(NaOH\); \(NaClO_4(aq)+H_2O(l)\) (the last option among the given choices which is "NaOH: NaClO₄(aq) + H₂O(l)")
-
give the net ionic equation for the reaction (if any) that occurs when …
$\ce{Pb^{2+}(aq) + 2Cl^-(aq) -> PbCl2(s)}$ (corresponding to the first option: $\ce{Pb^{2+}(aq) + 2 Cl^-(aq) -> PbCl2(s)}$)
-
question 30 select the correct set of (unbalanced) products for the fol…
The correct option is the one with \(CuCO_3(s)+NH_4Cl(aq)\) (the fourth option in the given list of options).
-
identify the acid-base reaction. \\(\\ce{h2 (g) + cuo (s) -> cu (s) + h…
\(2\ \text{HClO}_4\ (aq) + \text{Sr(OH)}_2\ (aq) \longrightarrow \text{Sr(ClO}_4\text{)}_2\ (aq) + 2\ \text{H}_2\text{O}\ (l)\) (the fourth option)
-
for the reaction 4 al(s) + 3 o₂(g) → 2 al₂o₃(s), when 1.5 moles of al a…
93% (corresponding to the option with 93%)
-
consider the following balanced reaction. if you begin with 25.00 grams…
Cl₂; 10.28 g of HCl
-
considering the following chemical reaction: 4 al(s) + 3 o₂(g) → 2 al₂o…
The reaction of 1 mole of Al will produce 1/4 mole of \( \text{Al}_2\text{O}_3 \) (the first statement) is false.
-
balance the following reaction. what is the stoichiometric coefficient …
2 (the option with 2, i.e., the option labeled "2")
-
which of the following is a non - polar molecule? \\(\\circ\\) \\(\\ce{…
\( BF_3 \) (the option with \( BF_3 \))
-
which structure is most like to be an exception to the octet rule?\ \\(…
\( \text{SF}_4 \) (the first option: \( \text{SF}_4 \))
-
chemical nomenclature name: trenton willour name the following: hcl (aq…
HCl (aq): Hydrochloric Acid HCl (g): Hydrogen Chloride H₂CO₃ (aq): Carbonic Acid HF (aq): Hydrofluoric Acid Fe (s): Iron O₂ (g): Oxygen NaCl (s): Sodium Chloride N₂O (g): Dinitrog…
-
question 21 choose the best lewis structure for xei₂. ○ :i=xe=i: ○ :i—x…
The third option: \( :\!\!\ddot{\text{I}} - \text{Xe} - \ddot{\text{I}}: \) (or the option labeled as the third one in the list, e.g., if the options are numbered 1-4, the third o…
-
in order to have 0.349 mol of feso₄, what would this sample weigh? ○ 0.…
53.0 g (the option with 53.0 g)
-
ethylenediamine contains 40.04% c, 13.44% h, and 46.61% n by mass. how …
90.09 g (corresponding to the option "90.09 g")
-
which of the following statements about empirical formulas are false: i…
II, III
-
what is the formula for triphosphorous tetrasulfide? ○ p₄s₃ ○ p₃s₄ ○ k₃…
B. \( \text{P}_3\text{S}_4 \)
-
what is the name of so₃? ○ sulfite ion ○ sulfur trioxide ○ sulfur oxide…
B. sulfur trioxide (assuming the options are labeled with letters, with "sulfur trioxide" as the correct one)
-
baco₃ is used in ceramic glazes and cement. which of the following give…
D. barium carbonate; ionic (assuming the options are labeled A - D as per the order: 1. barium carbon trioxide; covalent, 2. barium carbide; covalent, 3. barium(II) carbonate; ion…
-
iron(iii) hydroxide is present in rust. which of the following gives th…
\( \text{Fe(OH)}_3 \); ionic (the option with formula \( \text{Fe(OH)}_3 \) and bonding ionic)
-
what is the formula for the compound that can form between lithium and …
A. \( \text{Li}_2\text{S} \)
-
rank the following atoms in order of decreasing metallic behavior (i.e.…
Ca > Al > Si > N (the third option: Ca > Al > Si > N)
-
which of the following is a nonmetal? ○ sulfur ○ sodium ○ lithium ○ alu…
A. sulfur
-
how many core electrons does sn have? 46 50 4 36
46
-
what is the element that corresponds to the electron configuration $1s^…
B. Ca
-
the number of carbon atoms in 0.050 mol of c₁₂h₂₂o₁₁ (sucrose) is 12 c …
\( 3.6 \times 10^{23} \, C \) atoms (the option: \( 3.6 \times 10^{23} \, C \) atoms)
-
carbon-13 and carbon-14 are isotopes of carbon. which of the statements…
I, II, III
-
4-5 practice problems 1. write out the electron configurations for (a) …
Let's solve these problems one by one. We'll use the rules of electron configuration (Aufbau principle, Pauli exclusion principle, Hund's rule) to determine the electron configura…
-
question 1 which of the following is an example of an intensive propert…
density
-
18. analyze the following situation: an employee is not wearing the req…
b. Provide additional training on the importance of PPE ### Question 19
-
6 select the correct empirical formula for the following molecule: na₂s…
B. \(NaSO_3\) (assuming the second option is labeled B, if the options are labeled as A: \(Na_2S_2O_{12}\), B: \(NaSO_3\), C: \(Na_2S_2O_3\), D: \(NaSO\))
-
the formula that does not have $\\ce{ch_{2}o}$ as its empirical formula…
$C_6H_{10}O_5$
-
reitz integrated chemistry physics force review to do: receive a grade …
Net Force: \( 140\,\text{N} \) (right) Acceleration: \( 7\,\text{m/s}^2 \) (right)
-
mr tates was actually visiting our school, which was clearly in the mid…
D. you want the town to be not a spotlight
-
2 a compound with the molecular formula c₂h₄o₂ has the empirical formul…
\(CH_2O\) (assuming one of the options is \(CH_2O\), as per the calculation. If we consider the options, we need to match this formula. Looking at the options, the one with \(CH_2…
-
an experiment using 4.65 grams of sodium sulfite, na₂so₃. what is the m…
142.04 g/mol (the option with 142.04 g/mol)
-
4 fill in the blanks to complete the sentences. ice crystals form when …
s (Blanks in Order): 1. clouds 2. symmetrical, molecules 3. temperature, complexity
-
3 group the labels according to the temperatures they describe. vapor c…
- Below - 40 degrees Celsius: Vapor condenses directly to ice, Snow crystals create the most subtle shapes, Snow crystals form with sharp tips - Both: Water molecules form a cryst…
-
brainpop / assignment / snowflakes 1. 2. 3. 4. ice crystal water molecu…
1. Hydrogen atom 2. Water molecule 3. Ice crystal 4. Snowflake
-
which is the correct name for the solution hclo₃(aq)? chloric acid hydr…
A. chloric acid
-
double replacement – two compounds switch parts with one another. - $\\…
- Balanced \( \text{Mg(OH)}_2 + 2\text{HCl} ightarrow \text{MgCl}_2 + 2\text{H}_2\text{O} \) - Balanced \( 2\text{Al(OH)}_3 + 3\text{H}_2\text{SO}_4 ightarrow \text{Al}_2(\text{SO…
-
how many pairs of bonding electrons are present in a molecule that disp…
5
-
explain why the zn²⁺ ion has some stability. a) the zinc ion has achiev…
B) The zinc ion has full s, p, and d sublevels to form a pseudo - noble gas configuration.
-
quiz 3_chap 7: covalent molecules how many bonding pairs of electrons e…
3 (corresponding to the option "3")
-
which is not true of the $\\ce{sc^3+}$ ion? a) it was formed by the los…
B. It is considered to be a different element than a neutral Sc atom.
-
why is the calcium ion (ca²⁺) more stable than the calcium atom (ca)? a…
C. The noble gas configuration is more stable.
-
3. zinc a ar b ar3d¹⁰ c ar4s²3d⁸ d ar4s²3d¹⁰4p²
B. \([Ar]3d^{10}\)
-
2. barium a cs b la c rn d xe
D. [Xe]
-
select the most likely electron configuration for a stable positive ion…
B. $1s^2$
-
a. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 5s² 5d⁹ 8. the number of electrons …
d. 8 ### Question 9
-
how many single covalent bonds are elements in column f likely to form?…
1
-
mg(oh)₂ + hcl → mgcl₂ + h₂o al(oh)₃ + h₂so₄ → al₂(so₄)₃ + h₂o
Balanced equations: 1. $\boldsymbol{\ce{Mg(OH)2 + 2HCl -> MgCl2 + 2H2O}}$ 2. $\boldsymbol{\ce{2Al(OH)3 + 3H2SO4 -> Al2(SO4)3 + 6H2O}}$
-
mg(oh)₂ + hcl → mgcl₂ + h₂o
The balanced chemical equation is $\boldsymbol{\ce{Mg(OH)2 + 2 HCl -> MgCl2 + 2 H2O}}$
-
mg(oh)₂ + hcl → mgcl₂ + h₂o al(oh)₃ + h₂so₄ → al₂(so₄)₃ + h₂o
The balanced chemical equation is $\boldsymbol{\ce{Mg(OH)2 + 2HCl -> MgCl2 + 2H2O}}$
-
double replacement – two compounds switch parts with one another. - ( \…
The balanced chemical equation is $\boldsymbol{2AgNO_3 + K_2SO_4 ightarrow Ag_2SO_4 + 2KNO_3}$
-
how many pairs of bonding electrons are present in a molecule that disp…
5 (the option with "5")
-
agno₃ + k₂so₄ → ag₂so₄ + kno₃
$2\ce{AgNO_{3}} + \ce{K_{2}SO_{4}} = \ce{Ag_{2}SO_{4}} + 2\ce{KNO_{3}}$
-
quiz 3_chap 7: covalent molecules what is the acid within the chemical …
D. sulfuric acid (assuming the options are labeled A - D with D as sulfuric acid; based on the selection in the image, the correct answer is the option with "sulfuric acid").
-
quiz 3_chap 7: covalent molecules what is the acid within the chemical …
D. sulfuric acid (assuming the options are labeled A to D as: A. hydrogen sulfide acid, B. chloric acid, C. hydrosulfuric acid, D. sulfuric acid)
-
what type of bond do two oxygen atoms with the electron configuration $…
double (the option labeled "double")
-
which type of bond has one pair of electrons shared between atoms? ○ co…
B. single covalent
-
31. the element with electron configuration $1s^2 2s^2 2p^6 3s^2 3p^2$ …
d. Si ### Question 32
-
the electron dot structure for methane, ch₄, can be classified using vs…
B. tetrahedral
-
4. identifying reaction types & balancing equations step 2: balance the…
s (Coefficients in order): 1. $1, 3, 2$ 2. $2, 2, 3$ 3. $2, 1, 2, 1$ 4. $2, 1, 2$ 5. $2, 1, 2, 1$ 6. $2, 3, 6, 1$ 7. $1, 2, 1, 2$ 8. $1, 5, 3, 4$ 9. $1, 3, 1, 3$ 10. $4, 5, 2$ 11.…
-
what molecular shape is shown by this molecular model? trigonal bipyram…
A. trigonal bipyramidal
-
chem hon unit 3 test - electrons - fall 2025 1. zinc has how many valen…
a. 2 ### Question 2: Select the correct valence shell configuration for Bromine
-
quiz 3_chap 7: covalent molecules which is the correct name for the com…
dinitrogen trioxide
-
single replacement - an element replaces another element in a compound.…
- Balanced \( \text{KCl} + \text{F}_2 \) reaction: \( 2\text{KCl} + \text{F}_2 = 2\text{KF} + \text{Cl}_2 \) - Balanced \( \text{Mg} + \text{HCl} \) reaction: \( \text{Mg} + 2\tex…
-
fluorine belongs to group 17. how many covalent bonds are formed betwee…
1 (corresponding to the option "1")
-
multiple choice listen carbon often combines with oxygen, hydrogen, and…
B. Carbon can form four covalent bonds.
-
the image shows a chemical structure with groups like ch₂oh, h, oh, o. …
This is the cyclic structure of glucose (specifically, it appears to be the Haworth projection of a hexose, most likely glucose, with the characteristic six - membered ring (pyran…
-
organic inorganic add an answer item! add an answer item! answer bank c…
- **Organic**: Acetic acid ($C_2H_4O_2$), Methane ($CH_4$), Ethanol ($C_2H_6O$) - **Inorganic**: Water ($H_2O$), Ammonia ($NH_3$), Carbon dioxide ($CO_2$)
-
chem hon unit 3 test - electrons - fall 2025 1. zinc has how many valen…
a. 2 ### Question 2:
-
match each word to its definition. energy stored in a molecule a. chemi…
- energy stored in a molecule: a. chemical energy - sugar that organisms use for energy: b. glucose - group of atoms joined by covalent bonds: d. molecule - substance created duri…
-
a chemistry professor is preparing a lesson on the phases of matter. re…
First row (Matter undergoes...): Definitions Second row (Water changes...): Examples
-
a student is writing a biography of mae jemison, the first african amer…
- For "Jemison earned a bachelor of science degree in chemical engineering from Stanford University and a medical degree from Cornell University": Education (select the radio butt…
-
fossil fuels are primarily made of the elements, carbon and hyrdrogen. …
T. True
-
read the paragraph about processes for creating red dye. select the sen…
Clothing is mainly manufactured with artificial dyes.
-
8.6e: investigate how mass is conserved in chemical reactions and relat…
\(\boldsymbol{74}\) g (Option C) ### Second Sub - Question (Balancing \(CH_4 + 2O_2 ightarrow CO_2+2H_2O\))
-
calculating heat during phase changes the molar heat of vaporization of…
165.8 kJ
-
the molar heat of fusion of platinum (pt) is 4.700 kcal/mol. how much h…
\boxed{2.10} (assuming kJ, or adjust if unit is different, but based on calculation)
-
describing the morph naming scheme when naming an object you wish to mo…
The option with "!!" (assuming the intended correct prefix related to morph naming is `!` and this is the relevant option among the given ones).
-
5 using the periodic table, match each element to its proper classifica…
(Corrected for Astatine Typo, As = Arsenic): | Statement | Metals | Metalloids | Nonmetals | |-----------------|--------|------------|-----------| | astatine (As, assume As = arse…
-
a chemical engineer needs to calculate the amount of coolant required t…
The correct formula is \( -\Delta H_{\text{reactor}} \) (assuming the third option in the image is \( -\Delta H_{\text{reactor}} \); if options are labeled, e.g., C. \( -\Delta H_…
-
a scientist needs to calculate the amount of heat released when a sampl…
$-\Delta H_{\text{fus}}$
-
for each example of a phase change, identify whether heat is absorbed f…
- A popsicle melts on a hot day: Heat is absorbed from the surroundings. - Rubbing alcohol evaporates from the surface of the skin: Heat is absorbed from the surroundings. - Lava …
-
fill in the summary chart and turn in when done identifying types of re…
The balanced equation is \( 2\text{NaBr} + \text{Ca(OH)}_2=\text{CaBr}_2 + 2\text{NaOH} \) and the reaction type is double - displacement reaction.