Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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how does the author’s use of free verse allow him to effectively expres…
D. The use of free verse allows him to use unconventional rhythm. (Note: Assuming the options are labeled A - D in order, with the last option being D. If the original options had…
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a student conducts an experiment to determine the effect of adding salt…
C) volume of water
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the accepted value for a quantity is 5.67 g. if the measured value is 5…
A) 3.74%
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the accepted value for a quantity is 5.67 g. if the measured value is 5…
A) 3.74%
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there can be advantages to using fossil fuels. what is one advantage? ○…
B. Fossil fuels are inexpensive and readily available with existing equipment.
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which types of matter match the models? move one correct answer to each…
To solve this, we analyze the particle models: ### Top Model (Mixed Molecules): The top box has two different types of molecules (e.g., one with orange-yellow atoms, another with …
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teks 8.6.a models of matter 8.6.a: explain by modeling how matter is cl…
D. Move the molecules around so that one compound is clustered together, and the other compound is clustered together with only a little mixing.
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teks 8.6.a models of matter 8.6.a: explain by modeling how matter is cl…
B. Alexandra is correct because there is only one type of atom in each molecule.
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a student conducts three trials of an investigation to find the density…
B) 2.66 \( \text{g/cm}^3 \)
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look at the table of density data for an unknown substance. based on th…
B) 29.7g
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use the densities shown on the table to answer the question. substance …
C) gasoline, water, mercury
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which is a quantitative observation? a) melting point b) hardness c) te…
A) melting point
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which of the following properties of matter can be explained on a submi…
A) All the above
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color this answer yellow. 16 2.532 grams = ___ mg color this answer lig…
\(2532\)
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caroline conducted an investigation to test the effectiveness of water …
The unfiltered tap water
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which of the following is the primary way that recycling impacts marine…
A. By recycling as much plastic as possible, it prevents waste from entering the water.
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a student conducts an experiment to determine the effect of adding salt…
A) amount of salt added
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a student used an experiment to determine the effect of salt on the boi…
C. The control provides a standard (baseline) for comparison to see how salt affects the boiling point.
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cycles 1. what process adds carbon dioxide to the atmosphere? (handwrit…
Processes like **combustion (e.g., burning fossil fuels, oil refining)**, **animal respiration**, and **microbial decomposition** add carbon dioxide to the atmosphere. (From the d…
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question 1 what makes water a polar molecule? a it has no charged regio…
c. It has an unequal distribution of charges
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who is credited with creating the first periodic table? ○ johann dobere…
C. Dmitri Mendeleev
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what is the chemical symbol for magnesium? ○ mo ○ mn ○ mg ○ md
C. Mg
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how did the work of dmitri mendeleev differ from that of john newlands …
B. Mendeleev predicted elements that would later be discovered.
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which element has the greatest average atomic mass? ○ iodine ○ bromine …
C. tellurium
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how was the work of newlands similar to that of mendeleev on the period…
A. They both arranged the elements in order of increasing atomic mass.
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which element is classified as a noble gas? o n cl xe
D. Xe
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how did moseley establish a more accurate periodic table? by arranging …
B. by arranging the elements according to atomic number instead of atomic mass
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members of which group easily lose an electron to form a +1 cation? ○ h…
D. alkali metals
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which is classified as an inner transition element? ○ calcium ○ copper …
C. fermium
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which is another name for groups of elements? actinides families haloge…
B. families
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sound can travel through molecules other than air. true false
True
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question 1 why do we hear sound? ○ because of disturbed/moving air mole…
A. Because of disturbed/moving air molecules
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consider the model of the nitrogen atom. which electron configuration m…
\(1s^2 2s^2 2p^3\) (the second option: \(1s^2 2s^2 2p^3\))
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select the correct answer. which sentence best explains how steam power…
C. Steam - powered railways helped transport and sell agricultural produce far from where it was grown
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which is the electron configuration for lithium? ○ 1s² ○ 2s³ ○ 1s²2s¹ ○…
\(1s^2 2s^1\) (the third option: \(1s^2 2s^1\))
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which is the electron configuration for bromine? ○ ( 1s^2 2s^2 2p^6 3s^…
\(1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^5\) (the first option)
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each atom of an element has the following electron configuration. 1s²2s…
B. iodine
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when a 5.00 g piece of metal a was immersed in 38.0 ml of water, the wa…
The density of Metal A (\( \approx 0.417 \, \text{g/mL} \)) is greater than the density of Metal B (\( \approx 0.227 \, \text{g/mL} \)).
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which diagram shows a pair of electrons that have opposite spins? ○ ↑↓ …
The first option (the box with \(\boldsymbol{\uparrow\downarrow}\))
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a vessel contains 30 ml of water. a sample of 5.0 g of copper metal is …
The density of the copper sample is \( 0.5\ g/cm^3 \) (or \( 0.5\ g/mL \)).
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carrie is conducting an experiment on a solution. the solution’s initia…
B. a strong base, such as sodium hydroxide (NaOH)
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to show the electron configuration for an atom, what is the advantage o…
B. Orbital notation shows the spin of the electrons.
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guided reading 6.4 part 1 organic chemistry (pages 166-171) 1. what ato…
Carbon
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if a shell can hold a maximum of 32 electrons, what is the value of n? …
4 (corresponding to the option "4")
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buffers are choose choose that can react with strong acids and bases to
The first “Choose” (describing what buffers are) should be filled with: *solutions containing a weak acid and its conjugate base (or weak base and its conjugate acid)*. The second…
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blood is a mixture of a variety of materials. some of the materials are…
C. a suspension
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10 what is an acid give three properties of an acid 12 give two differe…
- **Definition**: A substance that produces $H^+$ (or $H_3O^+$) ions in aqueous solution. - **Properties**: - Sour taste. - Reacts with active metals to produce $H_2$ gas. - React…
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give a symbol and a name for the following elements. a) the 2$^{nd}$ pe…
Symbol: Ne, Name: Neon ### Part (b)
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a 26.0 g sample of a liquid was found to have a volume of 13.0 ml. what…
C) 2.00 g/mL
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what can a drop of liquid mercury be described as? ○ a pure substance a…
D. a pure substance and an element (assuming the last option is labeled D; if the original options had labels like A, B, C, D with the last one being "a pure substance and an elem…
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a teacher makes the following statement. \gasoline boils at a relativel…
A. distillation of a mixture
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which is a characteristic of mixtures? ○ they are chemically bonded tog…
D. They can be separated by physical processes.
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a solid precipitate is formed from the reaction of lead nitrate and sod…
filtration
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the table shows the percentages of hydrocarbons that are found in a sam…
D. a mixture
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instructions: in each box, draw the labeled particle diagram and explai…
Diagram: Identical single - type particles (e.g., all circles labeled as the same element). Explanation: An element is made of only one kind of atom, so the diagram with all ident…
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which sample is a pure substance? ○ zinc oxide ○ sugar dissolved in wat…
A. zinc oxide
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the table describes how some substances were formed. | substance | desc…
R
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which cannot be chemically broken down into simpler substances? ○ compo…
B. element
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which is a substance that is made up of only one type of atom? ○ compou…
B. element (assuming the options are labeled as A. compound, B. element, C. solution, D. mixture)
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which method would be best for separating the components of a mixture t…
A. distillation
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question 2 | chapter review: chapter 1 a scientist researching a new me…
Organic
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5. what is a color wheel? 6. red, pink, light pink are what color schem…
Monochromatic color scheme
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using the correct label to each event. each label can be used more than…
To solve this, we analyze each event based on the definitions of mechanical and chemical weathering: ### 1. "The minerals in a rock... form acids and pores" - **Explanation**: Inv…
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select the correct answer. the statue of leshan giant buddha in sichuan…
E. wind and chemical reaction
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for every 1.0 mole of glycine in the sample, how many molecules of meth…
\(1.08\times 10^{21}\) molecules of methionine
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o additional details were added for this assignment. the isotope of an …
C. Zirconium-93
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phases. a. in which phase(s) do molecules move freely? b. in which phas…
Liquid and Gas (or Gas and Liquid; also, sometimes just Gas is considered, but liquid molecules do move more freely than solids) #### B. In which phase(s) are molecules held toget…
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true or false: functional groups are sets of atoms that are ionically b…
False
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do you think the egg will be done faster if the heat is kept on high as…
Liquid (water) and gas (air) phases. ### Part B:
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2. draw the bohr model for na⁺ 3. draw the bohr model for ca²⁺ 4. draw …
### Problem 2: Draw the Bohr model for $\boldsymbol{\ce{Na+}}$ # Explanation: ## Step 1: Determine the number of protons, neutrons, and electrons in $\ce{Na+}$ - **Protons (P):** …
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the molecular structures of linoleic acid and palmitic acid, two natura…
C. Palmitic acid, because the absence of carbon - carbon double bonds allows the molecules to pack closely together.
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question 8 1 pts the respirator that would be used in places where dust…
A. A mask or mouthpiece with a mechanical filter
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atoms, chemical bonds, and inorganic compounds anatomy and physiology i…
base
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question 6 1 pts hepatitis can be caused by contact with ______. ○ chem…
B. blood
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antacids a client presents to the urgent care clinic complaining of chr…
base
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sodium chloride nacl calcium chloride cacl₂ strontium nitrate (sr(no₃)₂…
The Bohr model of \( \text{Ba}^{2+} \) has a nucleus with 56 protons, and electron shells with 2, 8, 18, 18, 8 electrons (from inner to outer shells, with the sixth shell empty). …
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select the correct answer. which of these actions is an example of chem…
C. Oxygen in air reacts with iron content in rocks, causing them to change color
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a scientist working in a lab wants to determine the precise ph of a sol…
C. A pH meter
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which definition best describes a base? a. a substance in a solution th…
C. A substance in a solution that captures hydrogen ions and raises the pH
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which substance in acid rain makes it more acidic than natural rainwate…
C. Sulfuric acid
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in an experiment, a scientist compares the effect of adding acid rain t…
D. Lake Minnetonka contains a buffer, but Upper Kintla Lake does not.
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which sentence correctly describes a solution with a ph lower than the …
D. The solution is acidic.
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a scientist wants to test how much of an acid can be added to a solutio…
D. Methyl yellow, which changes from yellow to red around a pH of 4.0
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which of the following describes a solution that contains a buffer? a. …
D. Acetic acid is added to the solution, but the pH of the solution does not change.
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the diagram on the left represents molecular - level particle drawings …
D. IV, II, III, I
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which substance acts as a buffer in natural water? a. distilled water b…
B. Minerals and salts
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orange juice is a solution that contains citric acid, which gives orang…
B. Battery acid with a pH of 0.8
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a gas occupies a volume of 6.0 l at a pressure of 2.0 atm. if the gas i…
B. 4 atm
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if more water was added to a 3m cucl₂ solution to the 100ml mark, would…
A. No, the number of moles of solute would not increase because the volume of water has no effect on the number of moles of solute.
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a avogadros law b charless law c boyles law d gay-lussacs law part c wh…
C. Gay - Lussac’s Law ### Part D
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which law relates temperature and volume? a avogadros law b gay-lussacs…
C. Charles's Law ### Part B
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which best describes the solute in a solution? a the substance that get…
A. the substance that gets dissolved
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drag each label to the correct location on the image. raul creates a li…
- The arrow pointing to the light from the bulb: radiant energy - The arrow pointing to the wires (or the circuit path): electrical energy - The arrow pointing to the battery: che…
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a gas sample has a volume of 5.0 l and contains 1.5 moles of gas. if th…
The new volume is $10.0\ L$.
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which of the following will decrease the pressure of a gas in a closed …
B. increasing the volume
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there are 4 moles of a gas at a pressure of 5.6 atm and a volume of 12 …
B. 204.6 K
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standard temperature and pressure (stp) is defined as: a 760 torr and 1…
C. 1 atm and 0 °C
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question 7 (1 point) which of the following properties of water helps m…
B. Adhesion ### Question 8
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question 6 (6 points) match the structural diagram to the name of the f…
1. The structure with -OH at the end: 6. 1 - hexanol 2. The structure with N, H, H and alkyl: 2. amine group 3. The structure R - CO - OR': 4. ester link 4. Hexanal line structure…
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question 19 of 25 methane (ch₄) is the main component of natural gas. i…
C. 1