化學
化學反應、化學計量、分子結構與元素性質。
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write the systematic name of each organic molecule: structure cl—c(cl)=…
1,1 - dichloro - 4 - methylpent - 2 - ene
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p⁺= e⁻= n⁰= 2. determine the number of protons, neutrons, and electrons…
For \(\boldsymbol{_1^1 H}\): \(p^+ = 1\), \(e^- = 1\), \(n^0 = 0\) For \(\boldsymbol{_1^2 H}\) (Deuterium): \(p^+ = 1\), \(e^- = 1\), \(n^0 = 1\) For \(\boldsymbol{_1^3 H}\) (Trit…
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name _______________________________ set 8th warm up 1. determine the n…
\( p^+ = 9 \), \( e^- = 9 \), \( n^0 = 10 \) ### Part b: \( \text{F}^- \) (Fluoride ion)
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uncertainty in measurement quiz cp chemistry a 0 / module 1: chemistry …
C. There are 30 students in the class, D. There are 100 cm in 1 m
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molecules are attracted to one another by van der waals forces. how do …
B. Van der Waals forces are weaker than ionic and covalent bonds.
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3. which of the following correctly shows the measurement 9.603 s round…
B. 9.60 s (assuming the options are labeled as A: 9.6 s, B: 9.60 s, C: 9.6030 s, D: 9.603 s)
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how does a molecular compound compare to the elements that make up the …
D. The properties of a compound are usually very different from the properties of the elements that make it up.
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2. what is the result of the following calculation? record to the corre…
7.535 mL
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the atomic number of carbon is six, which means that a carbon atom has …
B. All carbon atoms have six protons and six electrons. D. Atoms of some naturally occurring carbon isotopes may have six neutrons.
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deuterium is an isotope of hydrogen. it has a mass number of two. which…
A. a nucleus of one proton and one neutron, which is orbited by one electron
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when electrons transfer from one atom to another, both atoms become cho…
First "Choose" (for the type of species after electron transfer): ions Second "Choose" (for the bond type with electron transfer): ionic Third "Choose" (for the bond type with ele…
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complete the table about subatomic particles. terms can be used more th…
To complete the table about subatomic particles, we use the properties of electrons, protons, and neutrons: ### First Row (Particle with negative charge): - **Particle**: electron…
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q1 chemistry: u1l7 unit 1 review teacher: ____________ date: __________…
c. A mixture can be separated by physical means. ### Question 4
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1. **carbon dioxide has a formula of co₂. use this knowledge to represe…
### Problem 1 (Carbon Dioxide Phase Changes) #### Explanation: To represent the phase changes of \( \text{CO}_2 \) (solid → liquid → gas) and create a key: 1. **Solid Phase (Dry I…
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if the known mass of an object is 2.5 grams, which of the following mea…
2.49 g
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read the descriptions of rhyme schemes below free verse: poetry that do…
A. free verse
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read the following passage: the problem began simply enough. in the 195…
A. By tracing the contamination problem over time
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2/11 which data set is most precise? 150 g 75 g 1.75 g 2.49 g 4.50 g 3.…
The dataset with values 1.75 g, 1.72 g, 1.79 g (the orange - colored option) is the most precise as it has the smallest spread (difference between maximum and minimum values) amon…
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read the following passage: the problem began simply enough. in the 195…
A. Government slowdowns can lead to environmental disasters.
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you have a mixture of hydrogen gas (h₂) and oxygen gas (o₂). the mixtur…
The partial pressure of oxygen gas is \( \boldsymbol{830 \, \text{mmHg}} \).
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11 i can calculate the partial pressure of a gas from moles, temperatur…
The partial pressure of oxygen gas is $\boxed{404}$ mm (assuming $P_{\text{H}_2} = 475$ mm; if $P_{\text{H}_2}$ is different, substitute the correct value in Step 3).
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the total pressure of the gas mixture is 879 mm, using the partial pres…
Assuming Dalton's Law and \( P_{\text{H}_2} = 439.5 \) mm (from previous calculation), the partial pressure of \( \text{O}_2 \) is \( \boldsymbol{439.5} \) mm (or if the ratio is …
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which type of compounds is carbon found in? options: ionic compounds, m…
C. Organic compounds, D. Inorganic compounds (Note: Carbon is found in both organic (e.g., hydrocarbons, sugars) and inorganic compounds (e.g., CO₂, Na₂CO₃). If we consider the mo…
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8.give the symbol and number of electrons in a neutral atom of: uranium…
Uranium: U, 92 electrons Chlorine: Cl, 17 electrons Boron: B, 5 electrons Iodine: I, 53 electrons Antimony: Sb, 51 electrons Xenon: Xe, 54 electrons ### Question 9
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atomic number quick check which statement describes the properties of l…
C. They are malleable and lustrous, and they tend to conduct both electricity and thermal energy.
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use the periodic table to answer the question. in which group of elemen…
C. metalloids
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atomic number quick check use the periodic table to answer the question…
phosphorus (P)
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how does mercury differ from other metals? (1 point) it does not chemic…
B. It is not solid under normal conditions.
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which of these structures shows how the pictured molecule will look aft…
The second option (middle top) with the structure: ``` CH₃ | OH H C C=O H | (chain) ``` (Visually, the option with carbonyl on the right, chiral center with OH (solid wedge), H (d…
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atomic number quick check an element is highly conductive, highly react…
A. alkali metals
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critical thinking 5. applying concepts what happens to the volume of a …
The volume of the balloon decreases. This is explained by Charles's Law (at constant pressure, volume of a gas is directly proportional to its absolute temperature). When the ball…
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which type of bond forms between water molecules? ○ capillary bond ○ hy…
B. hydrogen bond
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laboratory simulation ch the papers to the most likely contents of each…
To solve this problem, we analyze the appearance of the papers and typical properties of substances (like water, alcohol, oil, etc.) that affect how they spread on paper: ### Pape…
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across 5. a tool used to stir mixtures and such. 8. a tool used to meas…
This is a crossword puzzle related to laboratory safety and equipment, which falls under the Natural Science discipline, specifically Chemistry (since it involves lab procedures a…
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which best explains the surface tension of water? ○ capillary action ○ …
B. cohesion
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which example illustrates adhesion? ○ water droplets sticking to a wind…
A. water droplets sticking to a window
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19 wearing sandals is appropriate attire for a science lab. a true b fa…
B. False ### Question 20:
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17 in a science lab, it is safe to smell chemicals directly to identify…
B. False ### Question 18
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important to tie back long hair in the science lab? a to keep it styled…
C. To prevent it from catching fire or dipping into chemicals. ### Question 15 (unsafe action with open flames in lab)
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which statement explains why hydrogen bonds are able to form between wa…
A. Water molecules are polar.
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a always wear safety goggles. b eat and drink in the lab. c ignore spil…
B. Tell the teacher immediately and rinse the area with plenty of water.
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experimental design directions: drag each tile to the correct box. eddi…
To determine the correct order of steps for Eddie's experiment, we follow the scientific method: ### Step 1: Make a Prediction Before conducting the experiment, Eddie should hypot…
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a robot spacecraft returned samples from the planetesimal 98765 aleks, …
The average atomic mass of ruthenium (Ru) for this sample is approximately $\boldsymbol{100.1}$ amu (rounded to the correct number of significant digits, or as calculated: $100.08…
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shakita wants to know if the ph of an open can of soda changes over tim…
B. the pH of the soda
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jay wants to know how the amount of acidity in rainwater influences the…
D. He can repeat his experiment multiple times and ask someone else to replicate his experiment.
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what appears to be the trend in electronegativity as you move down a gr…
B. decreasing
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using the mass and volume information, calculate the density of each ob…
$11.3\ \text{g/mL}$ #### Part (b)
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what appears to be the trend in electronegativity as you move from left…
increasing
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what appears to be the trend in first ionization energy as you move dow…
decreasing
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what appears to be the trend in the first ionization energy as you move…
A. increasing
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what appears to be the trend in atomic radius as you move down a group?…
A. increasing
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what appears to be the tre... us as you move from left to right in a pe…
decreasing
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from nature; addresses, and lectures 1. the first in time and the first…
4. Man desires to find the interrelation of elements in nature.
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name: riley sanchez date: class period: unit: atomic structure “history…
The idea of the atom was first developed around 400 B.C. by the Greek philosopher Democritus. His theory proposed that matter consists of tiny, indivisible particles called atoms,…
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complete the table below, using the diagram of an atom shown at right. …
| name | symbol | charge (in multiples of e) | approximate mass (amu) | location on diagram | |----------|--------|----------------------------|------------------------|----------…
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complete the table below, using the diagram of an atom shown at right. …
| name | symbol | charge (in multiples of e) | approximate mass (amu) | location on diagram | |----------|--------|----------------------------|------------------------|----------…
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bellringer 09/08 • unit 2: • nuclear processes whats the smallest part …
The smallest part of an element that still has the properties of that element is an atom. The three subatomic particles that make up an atom are protons, neutrons, and electrons.
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product reactant based on the particle model, which part is favored at …
Reactant
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calculate the temperature change that results from adding 250 j of ther…
To solve for the temperature change (\(\Delta T\)) when thermal energy (\(q\)) is added, we use the formula for molar heat capacity: \[ q = n \cdot C_m \cdot \Delta T \] Rearrangi…
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how many valence electrons are in the bohr model below?
7
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read these lines from \the monk’s tale.\ he had a son, belsazar was his…
D. abab
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c. what group does the element o belong? group 16 12.) which of these e…
a. Li ### Question 13: Which of these elements has the lowest ionization energy? (Options: a. O, b. B, c. C, d. F)
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question 7 (fill-in-the-blank worth 3 points) (01.02r lc) 25,000 cg is …
250
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if you calculated 41.0 ÷ 0.302, how many significant figures would be i…
3
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which of the following is a valid conversion factor? (\frac{1,000 \text…
\(\boldsymbol{\frac{1000\,\text{mL}}{1\,\text{L}}}\) (the first option)
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does oxygen belong? group 2 c. what group does chlorine belong? group 1…
Group 17 (or VIIA) ### Question 7: Which of the following will have a larger radius than Zinc? (Options: Gallium, Aluminum, Magnesium, Strontium)
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forms of energy practice directions: sort the following pictures into t…
To solve this, we analyze each image and assign to energy forms: ### Mechanical (motion/force): - A (biking), B (gears), H (scissors), L (drill), P (see-saw), S (car), V (stapler)…
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name: ______ instruction: answer the following. please refer to your pe…
Cl ### 1. b.
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molecules that result after a chemical reaction occurs are called multi…
A. products
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if a ball begins to roll down an incline, its ________ is converted int…
C. potential energy; kinetic energy (assuming the third option is labeled C, with the text "potential energy; kinetic energy")
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name instructions: answer the following. refer to your periodic table. …
a ### Question 8
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complete the table below, using the diagram of an atom shown at right. …
| name | symbol | charge (in multiples of e) | approximate mass (amu) | location on diagram | |----------|--------|----------------------------|------------------------|----------…
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read each description in the first column of the table below. if any ch…
s (filling the table): | Description | Does any element with \( Z \leq 92 \) match the description? | If yes, give the symbol of an element with \( Z \leq 92 \) that matches. | | …
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9 multiple choice 2 points which atomic orbital combination would resul…
The third option (the one with the two orbitals that have a symmetric, head - on - like overlap representation, e.g., the option with $\infty+\infty$ where the orbitals are orient…
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it is easier to determine the electron configurations for the p-block e…
B. their electrons are assigned to s and p orbitals only.
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the following are the broad classes of organic compounds except: organi…
D. organic compounds composed of hydrogen only
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which of these elements has an electron configuration of kr5s²? ○ bariu…
strontium
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7 multiple choice 2 points strong acids dissociate completely in water.…
C. \( \ce{CH3OH} \)
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multiple answer 2 points identify the functional groups in the structur…
A. carboxylic acid, B. aromatic hydrocarbon, C. Alcohol, F. amide
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which one of the molecules shown below has no net molecular dipole mome…
\( \boldsymbol{\text{H}_2\text{CCH}_2} \) (or \( \boldsymbol{\text{H}_2\text{C}=\text{CH}_2} \), ethene)
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multiple choice 2 points which sequence ranks the following isomers in …
3<1<2
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which is the electronic configuration for oxygen? ○ $1s^2 2s^2 2p^1$ ○ …
\(1s^2 2s^2 2p^4\) (the third option: \(1s^2 2s^2 2p^4\))
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3 multiple choice 2 points shown below is one of the sex pheremones fro…
0 (corresponding to the option "0")
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19 wearing sandals is appropriate attire for a science lab. a true b fa…
B. False ### Question 20:
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17 in a science lab, it is safe to smell chemicals directly to identify…
B. False
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2 multiple choice 2 points how many σ bonds does the compound shown con…
10 (the option with 10)
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in the structure below, the sigma bond of the carbonyl is formed from t…
A. \( sp^2, sp^2 \)
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look up any chemical’s sds (msds) form online. on one side of a blank p…
To complete this task, here's a step - by - step guide: ### Step 1: Select a Chemical Pick a common chemical, for example, sodium hydroxide (NaOH). ### Step 2: Find the SDS (MSDS)…
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16 if you do not understand the instructions for an experiment, what sh…
A. Ask the teacher for clarification. ### Question 17
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why is it important to tie back long hair in the science lab? a to keep…
C. To prevent it from catching fire or dipping into chemicals ### Second Question (unsafe action with open flames):
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12 which of the following is a basic safety rule to follow in a science…
A. Always wear safety goggles. ### Question 13 (What should you do immediately if a chemical spills on your skin during an experiment?)
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a sample of an unknown substance has a mass of 89.5 g. if 345.2 j of he…
\( 0.193 \)
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select the correct name of this class: a. oxidizing material b. corrosi…
c. Compressed Gases
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one of the ways to make 550 ml of a 0.077 m solution of sodium chloride…
60.7 mL of the stock solution and 489 mL of water.
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question 11 what does gibbs free energy (g) represent in a chemical rea…
C. The chemical potential energy ### QUESTION 12
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complete the ion symbol for the atom below. submit your answer
\(\boxed{^{17}_{8}\text{O}^{2-}}\) (Note: If the neutron count is different, adjust. But assuming the diagram has 8 protons, 9 neutrons, 10 electrons, this is the ion for oxygen-1…
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question 10 what is the change in gibbs free energy for a reaction in w…
\(-1.1\times 10^{5}\ J\) (corresponding to the option \(-1.1 \times 10^{5}\ J\))
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question 9 a reaction is spontaneous if δg is equal to zero. greater th…
C. Less than zero. (Here we assume the options are labeled as A. Equal to zero, B. Greater than zero, C. Less than zero, D. Equal to the $\Delta H$ of the system)
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question 8 what determines the spontaneity of a reaction? the sign of δ…
The sign of $\Delta G$.
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give the ion symbol for the ion that has 82 protons and 80 electrons.
\( \text{Pb}^{2+} \)