化学
化学反応、化学量論、分子構造、元素の性質。
-
(c) a graph of potential energy versus internuclear distance for two cl…
To sketch the curve for $Br_2$: 1. **Shape**: Maintain the same general curve shape (decreasing to a minimum, then increasing) as the $Cl_2$ curve. 2. **Equilibrium Distance**: Sh…
-
7. which of the following is a precious metal commonly used in jewelry …
a. Platinum
-
in a group of water molecules, hydrogen bonds form between ______. a tw…
d. the oxygen atom in one molecule and a hydrogen atom in another molecule
-
what name is given to the bond between different water molecules? a ion…
b. hydrogen
-
question 3 (1 point) a polar covalent bond ______. a shares electrons e…
d. results from the unequal sharing of electrons
-
question 1 (1 point) an atoms reactivity is determined by its ______. a…
d. electron configuration
-
when comparing different ionic compounds, the one with the ions of grea…
smaller
-
which of the following would be expected to have the lowest melting poi…
KI
-
non-polar molecule, polar molecule, xef₂
$\ce{XeF2}$ is a non - polar molecule, so it should be placed in the "Non - Polar Molecule" category.
-
question: what agricultural method did the aksumites adapt that involve…
Terrace farming
-
what is the molecular geometry of the following? image of a molecular m…
B. Tetrahedral
-
polar bonds non-polar molecule non-polar bonds polar molecule so₂ selec…
- polar bonds - Polar molecule
-
based on formal charge arguments, which molecule is the more appropriat…
The middle structure (with \( \text{H}_2\text{N}-\text{O}-\text{H} \) and a lone pair on N) is the more appropriate structure.
-
this carbon atom has... options: sp³ hybridization (yellow), sp² hybrid…
The carbon atom has \( \boldsymbol{sp^2} \) hybridization (corresponding to the "sp² hybridization" option).
-
what 3-d vsepr shape does this molecule exhibit? options: linear, trigo…
trigonal pyramidal (assuming the molecule has 3 bonding regions and 1 lone pair, like \(NH_3\)) or if it's \(CH_4\) - tetrahedral, \(BF_3\) - trigonal planar, \(CO_2\) - linear. B…
-
what is the molecular geometry of the following? square planar, tetrahe…
B. Tetrahedral
-
identify the hybridization of the highlighted carbon present in 2-butyne
\( \text{sp}^3 \) (the orange option)
-
draw the lewis structure for bei₂. then compare your drawing to the ans…
The correct option is the purple - colored card (with the structure showing Be in the middle, single bonds to two I atoms, and 3 lone pairs on each I atom). If we assume the purpl…
-
which of the following images represents a trigonal bipyramidal molecul…
The image with the green border (the top - most image among the four) represents a trigonal bipyramidal molecular geometry.
-
choose the ionic compound with the greater magnitude of lattice energy.…
\( \text{CaCl}_2 \)
-
h−c≡c−h(g) + 2hi(g) → (h₃c−c−i with h atoms) (g) using the table of ave…
-217
-
what is the shape of the following molecular structure? options: linear…
B. Trigonal planar
-
which molecule exhibits resonance? co₂ o₃ becl₂ nf₃
\( \text{O}_3 \) (Ozone) exhibits resonance.
-
which statements describe iambic pentameter as it is used in shakespear…
A. Each line contains five metrical feet, E. In a group of two syllables, the second is stressed
-
which molecule exhibits resonance? options: co₂, o₃, becl₂, nf₃
\( \text{O}_3 \) (the molecule in the blue box)
-
if a molecule contains polar bonds, the molecule may or may not be pola…
True
-
what is the molecular shape of the following? options: trigonal bipyram…
Octahedral (the option with text "Octahedral")
-
read shakespeares \sonnet 100.\ where art thou, muse, that thou forget’…
cdcd
-
what is the correct lewis structure for ammonia, nh₃?
The correct Lewis structure for \( \text{NH}_3 \) is the top - most (yellow - bordered) structure, which shows nitrogen (\( \text{N} \)) bonded to three hydrogen (\( \text{H} \)) …
-
what is the formal charge on the bromine atom in this lewis dot structu…
\(+1\)
-
apply the vsepr model to xef₄. which of the following molecular shapes …
B. Square planar
-
if the energy needed to break bonds is less than the energy released wh…
the reaction will be exothermic (the option with the teal background, assuming the typo - free correct option is "the reaction will be exothermic")
-
in a(an) polar bond, one atom pulls on the shared electrons more than t…
True
-
what is the formal charge of phosphorus in the lewis structure shown he…
0
-
what is the molecular shape of the following? see-saw tetrahedral bent …
Tetrahedral
-
the hybridization of the carbon present in formaldehyde, ch₂o, is image…
\(sp^{2}\)
-
what is the molecular geometry of h₂s? lewis structure: h—s—h with two …
The molecular geometry of \(H_2S\) is bent. So the correct option is the one labeled "bent".
-
choose the ionic compound with the higher boiling point.
NaCl (the ionic compound with the higher boiling point is NaCl)
-
what is the molecular geometry? options: trigonal planar, linear, trigo…
Trigonal Pyramidal
-
which of the following illustrations shows a trigonal planar geometry?
The illustration with the green border (the top - most one) shows a trigonal planar geometry.
-
which of the following statement(s) applies to the carbonate ion, illus…
- carbonate ion exhibits resonance - all the carbon - oxygen bond lengths in carbonate are the same
-
what molecular geometry has bond angles of 109.5°? options: tetrahed ra…
tetrahed ral (assuming it's a typo for tetrahedral)
-
pre-lab 1 question 10 4.75 points homework • unanswered • due today, 1:…
# Explanation: ## Step1: Calculate the mean The mean ($\bar{x}$) is calculated by summing all the values and dividing by the number of values. Given values: \( x_1 = 8.009 \, \tex…
-
the bond angle for a tetrahedral geometry is ——. options (from image): …
The bond angle for a tetrahedral geometry is \(109.5^\circ\) (the orange - colored option with \(109.5^\circ\)).
-
question clay used to make earthenware has a good ______: it is pliable…
C. plasticity
-
molecular shape for xef₄ (hint: start with a lewis structure) square py…
square planar
-
which of the following images represents a trigonal planar molecular ge…
The image with the teal border (the bottom - most image among the four) represents a trigonal planar molecular geometry.
-
title = q2a8 consider the following processes: (i) making kool-aid™ by …
(i), (ii), and (v) (the last option in the list: (i), (ii), and (v))
-
question 1 1 pts title = q1a4 which of the following scientific observa…
None of the above statements in and of itself proves that "Hydrogen an element" (the option with this text, as it's the correct reasoning that the other observations don't prove h…
-
pre-lab 1 question 9 4.75 points homework • unanswered • due today, 1:3…
c. 2.000 g/cm³
-
pre-lab 1 question 8 4.75 points homework • answered • due today, 1:30 …
b. 2.70 g/cm³
-
question 4 if a molecule is polar, we would expect which of the followi…
A. It will form hydrogen bonds with water
-
which part(s) of the molecule below can form hydrogen bonds with water?…
B, D (and potentially C depending on context, but B and D are more direct for H - bonding with water)
-
title = q7a10 the temperature of a chemistry lab you are working in is …
158.1 g
-
question 1 which functional groups are in the molecule below? molecular…
- A: Aryl halide (or Chloro group on aromatic ring, Haloarene) - B: Heterocyclic amine (Piperazine, Cyclic diamine) - C: Ether - D: Carboxylic acid (If we consider each labeled pa…
-
current attempt in progress estimate δu for the following reaction usin…
-90 kJ/mol
-
current attempt in progress we can describe the combustion of glucose, …
-945 kJ mol⁻¹ (corresponding to the option: -945 kJ mol⁻¹)
-
view policies current attempt in progress estimate the reaction energy …
The reaction energy for the reaction \(H_2 + F_2 ightarrow2HF\) is \(\boldsymbol{- 542\space kJ/mol}\) (the negative sign indicates that the reaction is exothermic).
-
rank the elements or compounds in the table below in decreasing order o…
For rank 2: D (the substance with Lewis structure \(C_2Cl_4\)), for rank 3: B (the substance with Lewis structure \(O = N - Cl\))
-
rank the elements or compounds in the table below in decreasing order o…
1. A (\(CaCl_2\)) 2. B (\(ONCl\)) 3. D (\(C_2Cl_4\)) 4. C (\(Cl_2\))
-
rank the elements or compounds in the table below in decreasing order o…
1. Highest boiling point: B (CaO) 2. Next highest: A (\(CH_3CH_2OH\) or the Lewis structure shown for A) 3. Next: D (the Lewis structure shown for D) 4. Lowest: C (CO)
-
rank the elements or compounds in the table below in decreasing order o…
1. D 2. B 3. C 4. A (If selecting the next highest after D, choose B; after B, choose C; after C, choose A.)
-
part 3 - thinking with the periodic table 7. what do the elements that …
D. Electron Energy Levels ### Question 10
-
the first charter of virginia, 1606 also we do, for us, our heirs and s…
B. The development of representative democracy.
-
the first charter of virginia, 1606 also we do, for us, our heirs and s…
A. The democratic ideals of the Enlightenment.
-
the first charter of virginia, 1606 also we do, for us, our heirs and s…
C. The origins of democracy in the North American British colonies.
-
ments east atoms ame ferent rons mple, hich is that of all of ighted ₆¹…
To determine the number of neutrons and mass number for each carbon isotope, we use the following concepts: ### For \( \boldsymbol{_6^{12}C} \): ## Step1: Calculate number of neut…
-
substance x is known to exist at 1 atm in the solid, liquid, or vapor p…
To solve this problem, we analyze the heating process of Substance X step by step: ### Step 1: Heat Solid X from \( 20^\circ \text{C} \) to Melting Point (\( 30^\circ \text{C} \))…
-
a piece of silver whose mass is 10.4 g is immersed in 20.9 g of water. …
\( 33.2 \) ### For energy absorbed by water:
-
exit ticket summary - history of the atomic model (b) fill in the blank…
### John Dalton (1808) - **Contribution blanks**: - First true **atomic theory** - Substances combined in strict **numerical ratios** (or "fixed proportions") - Atoms are **solid*…
-
question 7 of 15 view policies current attempt in progress a piece of s…
Approximately $\boldsymbol{33.2}$ J (or more precisely 33.24 J) ### Part 2: Energy absorbed by water
-
physical and chemical changes - 7.6c what other changes do you see happ…
To answer this, we can list common physical and chemical changes: ### Physical Changes (no new substance, just form/state change): - **Melting ice**: Ice (solid $\ce{H2O}$) become…
-
study the following phase diagram of substance x. use this diagram to a…
s: 1. State of the sample at \( 81^\circ\text{C} \) and 1.0 atm: liquid 2. When pressure decreases by 0.5 atm at constant \( 81^\circ\text{C} \): vaporize (liquid to gas) 3. When …
-
an electric heater supplies 46.9 joules of energy to 13.5-g sample of c…
\( 20.5 \) (or a more precise value depending on calculation, but approximately \( 20.5^\circ\text{C} \))
-
study the following phase diagram of substance x. use this diagram to a…
### Sub - Question 1: Determine the state at \(-234^\circ C\) and \(1.7\) atm #### Step 1: Convert temperature to Kelvin The formula to convert Celsius to Kelvin is \(T(K)=T(^\cir…
-
14. what is electronegativity? 15. how does the electronegativity chang…
Electronegativity is the tendency of an atom to attract electrons in a chemical bond. ### Question 15: How does electronegativity change across a period? Why?
-
view policies current attempt in progress the heat capacity of silver i…
254 J
-
1. draw and label the parts of an atom. 2. draw a water molecule and la…
- **Nucleus**: Contains protons (positive charge) and neutrons (neutral). - **Protons**: Positively charged particles in the nucleus. - **Neutrons**: Neutral particles in the nucl…
-
study the following phase diagram of substance x. use this diagram to a…
liquid ### Second Question:
-
10. which of the following digits are not considered significant? ○ zer…
B. zeros to the left of non - zero digits
-
8. how many significant figures are present in the measurement 0.004820…
5 (corresponding to the option "5")
-
a backpacker climbs a hill. energy is consumed, energy is produced. rad…
Consumed: Chemical energy; Produced: Potential energy (and Thermal energy as a by - product, but the main useful energy change for height gain is potential. If considering the ene…
-
current attempt in progress in the following process, energy is transfo…
Consumed energy: Chemical (or sometimes written as "Chemical Energy"), Produced energy: Gravitational Potential (or "Gravitational Potential Energy") (Note: Depending on the optio…
-
test review: periodicity 3s²3p¹ 4s²3d¹⁰4p⁵ periodic trends: 1. what is …
Periodicity is the repeating pattern of chemical and physical properties of elements in the periodic table with increasing atomic number, due to periodic electron - configuration …
-
question 8 (1 point) what is the charge on a particle that has 17 proto…
e) None of the above
-
2. what does this model represent? 1. positive nucleus, electrons movin…
4. Plum Pudding/Blueberry Muffin
-
question 7 (1 point) how many electrons are in the element potassium wi…
a) 19
-
current attempt in progress explain how each of the following observati…
(a) First blank: potential; Second blank: potential; Third blank: potential; Fourth blank: kinetic (b) First blank: increase; Second blank: kinetic; Third blank: thermal
-
question 8 (1 point) what is the atomic mass (in amu) for an element wi…
c) 30.97
-
question 5 (1 point) which of the following is/are true about isotopes?…
- The atomic number must be the same - The number of neutrons must be different
-
which element has 19 protons in its nucleus? a) f b) k c) cannot determ…
b) K
-
a chemical change-- a can easily be reversed by physical means. b alter…
B. alters a substance’s chemical structure to create a new substance
-
what are the four main indicators of a chemical change? a state-of-matt…
D. Precipitate, energy exchange, color change, gas production
-
select all of the sentences that do not use brackets correctly. □ in 19…
- Dr. Janusch began his experiments during the 1920s [See pages 33 and 34.], but the turning point in his work came in 1935. - The feature of the day is the Hubble Telescope movie…
-
which of the following is an example of a chemical change? a mixing two…
A. Mixing two substances and seeing bubbles
-
physical and chemical changes - 7.6c physical changes affect the— a col…
D. observable properties of an object
-
which of the following are physical properties? a flammable, magnetic b…
B. Dull, nonmagnetic
-
elements and compounds - 7.6a, 7.6b data table group a\t\t\tgroup b for…
25 (if Group A total atoms is the question) Or if Group B: $2 + 3 + 1 + 1 + 3 = 10$ Since the problem isn't fully stated, but based on the table, a common task is summing atoms. L…
-
name wendy ponce, sept,10 period 2 phet -building an atom part 1 and 2 …
Protons and neutrons ### Question 4
-
3.3 energy changes in chemical reactions in the following reaction, the…
The energy required to break a mole of \( O_2 \) (i.e., break the \( O=O \) bond in one mole of \( O_2 \) molecules) is \( \boldsymbol{498} \, \text{kJ/mol} \).