化學
化學反應、化學計量、分子結構與元素性質。
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5. identify which particle can be added or removed from the carbon atom…
Neutron
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phenolphthalein solution is used as an indicator of acids and bases. if…
C. pink.
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what is the oxidation state of sulfur in so₃²⁻? a. 0 b. -2 c. +3 d. +4 …
d. +4
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explain the changes in molecular motion of particles as they change fro…
A. As the phase changes occur, the freedom of motion of the particles increases.
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5. identify which particle can be added or removed from the carbon atom…
Neutron
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when carbon dioxide is formed, one carbon atom forms double covalent bo…
C. more stable than individual atoms as now the outer energy levels of all atoms are filled.
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3. identify the one particle the does not affect the atoms mass number.…
Electron
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the form of energy most responsible for producing sunlight is a heat en…
B. nuclear energy.
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5. identify the subatomic particle(s) responsible for an atom’s identit…
Protons
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x-ray crystallography is a technique used by chemists, physicists, and …
D. wavelengths
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part c pour the water from part b into one of the large containers. pou…
When pouring the water - part B mixture and vinegar into containers: - **Visual Observation**: If part B was a reactive substance (e.g., a solid that dissolves/reactsin water or v…
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part b label the small containers 1 and 2. add ¼ cup of room - temperat…
- Hypothesis for water and baking soda: Combining water and baking soda will not result in a chemical reaction (or will result in a physical dissolution process without a signific…
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ws 1.4 density problems (be certain to specify final units) 1. calculat…
1. 1.52 g/cm³ 2. 0.65 g/mL 3. 131.6 mL 4. 0.354 cm³ 5. 637.4 g 6. 2.38×10⁴ mL 7. 2.45 g/cm³ 8. 3.75×10⁴ g
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19. now, look at the galaxy cards on the next slide. based on what you …
Since the problem is about classifying galaxies using Edwin Hubble's Classification Scheme (which involves types like Ellipticals, Spirals, Irregulars, etc.), the relevant subfiel…
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20. is it correct or incorrect in science to define a theory as someone…
Incorrect. A scientific theory is a well - substantiated, comprehensive explanation of natural phenomena, supported by extensive evidence (like experiments, observations). A "best…
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water for questions 10–12, write true if the statement is true. if the …
False, replace "covalent" with "hydrogen" ### Question 11
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question 1: hypothesis and data collection part a place ½ teaspoon of b…
Breaking up lumps increases the surface area of baking soda, ensuring uniform and efficient reactions (if reacting with other substances), accurate measurement, and consistent exp…
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place a t for true or an f for false on the blank for each of the follo…
F; Correct: water ### 2.
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3. how many valence electrons do the following elements have? ___ fr __…
s (Key Highlights): #### Problem 3: - Fr: 1 - O: 6 - Ne: 8 - C: 4 - Mg: 2 - Cl: 7 - Al: 3 #### Problem 14: - Atom: Na (Sodium) - Valence e⁻: 1 #### Problem 15: - Atom: Ne (Neon) -…
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water is frequently used to generate steam, a product you can sometimes…
16.3
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states of matter identifying a molecule from its electrostatic potentia…
\(\boldsymbol{HI}\) (and also, upon re - evaluation, \(HBr\) and \(CO\) might be considered? Wait, no, let's re - check the electrostatic potential map. The map shows a molecule w…
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this sketch of a neutral molecule is shaded red or blue wherever the el…
\(\boldsymbol{\text{HI}}\), \(\boldsymbol{\text{HBr}}\) (check the boxes for HI and HBr)
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background bohr diagrams are used to illustrate the probable location o…
Each has 1 electron in the outer energy level. #### Part (b)
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4. which subatomic particle is most responsible for the current arrange…
Proton ### Question 5
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categorize drag and drop each substance to the correct column based on …
- **Molecule** column: Hydrogen ($H_2$), Oxygen ($O_2$), Iodine ($I_2$) - **Compound/Molecule** column: Methane ($CH_4$), Ammonium Nitrate ($NH_4NO_3$), Glucose ($C_6H_{12}O_6$), …
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1. which state of matter is easily compressible? gas, because the parti…
A. Gas, because the particles are very far apart from each other.
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water molecules are held together by: metallic bonds ionic bonds polar …
Hydrogen bonds
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in one to two sentences, explain why structural formulas are a good opt…
Structural formulas are good for depicting complex molecules (e.g., carbon - based compounds, polymers) as they illustrate the arrangement of atoms and bonds, aiding in understand…
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1. a learner investigates the relationship between the pressure and vol…
Boyle's Law ### 1.2
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determine whether each statement is a description of a physical propert…
chemical ### For "Salt is soluble":
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determine whether each statement is a description of a physical propert…
chemical (select the "chemical" option for the first statement) ### For the second statement: "Steel is attracted to magnets."
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which option describes the molecule geometry of a molecule with one bon…
linear
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which type of model best represents the molecular arrangement of crysta…
The correct option is ball - and - stick.
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polymers are long chains of (1 point) o crystals. o electrons. o atoms.…
molecules.
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when a single salt crystal is added to a cool liquid, large crystals fo…
The liquid is a pure substance because it was made up of a single compound.
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in the space below, write the noble gas notation/shorthand electron con…
\([\text{He}]2s^{2}2p^{3}\)
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determine whether each statement is a description of a physical propert…
physical (check the box next to "physical" for "Copper conducts heat well") ### For "Alcohol has a sweet odor":
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which statement about pure substances and molecules is correct? (1 poin…
All molecules are pure substances
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1 - background information 2. the attraction that forms between atoms w…
Ionic ### Question 3
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max puts cereal in a bowl and pours milk over it. which term best descr…
heterogeneous mixture
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determine whether each statement is a description of a physical propert…
physical (check the box next to "physical" for "Copper conducts heat well") ### For "Alcohol has a sweet odor":
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which option is a physical property of matter? (1 point) flammability a…
boiling point
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directions complete the sentences by writing in the term from the vocab…
nutrition ### 2.
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the composition of the solution and the state of the light bulb (lit or…
D. The sodium chloride and potassium iodide dissolve to form positive and negative ions which allow the solution to conduct electricity.
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magnesium reacts with another element to form a compound. which element…
C. Sulfur
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multiple choice items which compound will most likely form when an elem…
C. hydrochloric acid, HCl
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a man makes breakfast. he puts some toast in the toaster, and mixes som…
B. Burning toast is a chemical change; straining orange juice is a physical change
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why are intensive properties useful for identifying a substance? (1 poi…
A. They do not depend on the amount of substance you have.
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what is true about boiling? (1 point) the boiling point of acetone is h…
The boiling point of a liquid depends on atmospheric pressure
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what is a pure substance made of positive and negative ions in a fixed …
an ionic compound
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introduction to chemistry unit test how does hydrogen bonding explain t…
It makes ice float on top of water instead of sink.
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1) oxygen 2) bromine 3) phosphorus 4) argon 5) nitrogen determine what …
s (Sample for Key Parts): - **Nitrogen Electron Configuration**: $\boldsymbol{[He] 2s^2 2p^3}$ - **Element for $1s^2 2s^2 2p^3$**: $\boldsymbol{\text{Nitrogen (N)}}$ (Repeat simil…
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the mendeleev lab of 1869 introduction: the elements had been listed an…
To solve for the identity of each unknown element, we analyze their properties and match them to the periodic table trends (e.g., group/period trends for physical state, density, …
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15. how many atoms are there in 1 mole of nacn?
The number of atoms in 1 mole of \(\text{NaCl}\) is \(\boldsymbol{1.204\times 10^{24}}\) (or more precisely \(1.2044\times 10^{24}\))
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6 - write the chemical formula for the following compounds and indicate…
| Compound Name | Chemical Formula | Ionic or Covalent | | --- | --- | --- | | sulfur dibromide | $SBr_2$ | Covalent | | sodium nitride | $Na_3N$ | Ionic | | magnesium oxide | $Mg…
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table rows: gaf₃ (gallium fluoride, ionic); ph₃ (phosphine, covalent); …
boron trifluoride
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13. ____ sublevel. rows 6 and 7 contain elements that are placed at the…
s: 13. $f$ 14. Lanthanide 15. Actinide 16. $f$ 17. Lanthanides 18. Actinides 19. Alkali Metals 20. Alkaline Earth Metals 21. Halogens 22. Noble Gases 23. $s$ 24. $p$ 25. Non - met…
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use the provided image and the phrases below to correctly complete the …
bulk element (or reactive element, or metal element - based on typical potassium properties; from the labels, "bulk element" or "reactive element" or "metal element" are options. …
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ph₃ covalent cao ionic p₂br₄ covalent nh₃ covalent mgbr₂ ionic li₂s ion…
To determine the bond type (ionic or covalent) for each compound: ### \( \ce{PH3} \) - Step 1: Identify elements. \( \ce{P} \) (nonmetal) and \( \ce{H} \) (nonmetal). - Step 2: No…
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5 - name the following compounds and indicate whether they are ionic or…
### For NaBr: ## Step1: Identify ions Na⁺ (sodium ion) and Br⁻ (bromide ion). ## Step2: Name the compound Combine names: Sodium bromide. ## Step3: Determine bond type Ionic (metal…
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11. how many moles are in 17.987 grams of water (mgcl₂)? 12. approximat…
\( \approx 0.189 \) moles ### Question 12: Approximately how many atoms are in 28.923 grams of \( \text{Na} \)?
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4 - synthesize the information you learned about ionic and covalent bon…
| Ionic | both | Covalent | | --- | --- | --- | | Transfer valence electrons | Valence Electrons | Share valence electrons | | Metal + nonmetal (or polyatomic ions) | Elemental Co…
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group halogen henry moseley lanthanoids mendeleev metals metalloid nobl…
s: 1. Periodic Table 2. Mendeleev 3. atomic mass 4. Periodic Law 5. Henry Moseley 6. atomic number 7. Period 8. Group 9. Family 10. Valence Electrons 11. 8 (eight) 12. Transition …
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select the correct answer. which of these reactions is a combustion rea…
A. burning wood
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3. differentiate ionic from covalent: use the word bank to complete the…
| | Ionic Bond | Covalent Bond | |------------------|--------------------------|--------------------------| | Electrons | Transferred | Shared | | Materials | Metal + Nonmetal | N…
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problem worksheet below. fill in the blanks numbered with words from th…
To solve this fill - in - the - blank problem about the periodic table, we refer to the knowledge of chemistry (a subfield of Natural Science) and the given word bank: ### 1. The …
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name one periodic trend, and what is its trend?
One periodic trend: Atomic radius. Its trend: Generally decreases across a period (left - right) and increases down a group (top - bottom).
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determine what elements are denoted by the following electron configura…
7) Nitrogen (N) 8) Chromium (Cr) 9) Terbium (Tb) (Note: The electron configuration [Xe] 6s²5d⁹ is non - standard; the correct configuration for Terbium is [Xe] 4f⁹6s², but followi…
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substance | element 1 symbol; metal/nonmetal | element 2 symbol; metal/…
### For $\boldsymbol{Al_2O_3}$: ## Step1: Identify Element 1 Element 1 is Al (Aluminum). Aluminum is a metal. ## Step2: Identify Element 2 Element 2 is O (Oxygen). Oxygen is a non…
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6 formula 1 point a block of unknown metal occupies a volume of 27.59 m…
$5.72\ g/mL$ ### Question 7
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in the space below, write the noble gas notation/shorthand electron con…
\([\text{He}] 2s^2 2p^3\)
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match each term to its definition. tiles chemical energy transition sta…
temperature - a measure of the average kinetic energy of particles, chemical energy - energy that a substance has because of the arrangement of its atoms, chemical reaction - the …
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15 formula 1 point a student collects co₂ gas in a gas collection tube.…
$0.18$ ### Question 16
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finish later submit check my answers 1 left na mg k ca sc ti v cr mn fe…
Blue ### Part b
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check all that apply - if the ratio of protons (h⁺) to hydroxide ions (…
- If the ratio of protons ($\text{H}^+$) to hydroxide ions ($\text{OH}^-$) is ten to one ($10:1$), then the solution is acidic. (Checked) - Adding a base to an acidic solution wil…
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select all the correct answers. some chemical reactions absorb energy r…
Plants use sunlight and atmospheric gases to make food., A person activates a cold pack by hitting it against a surface., A rechargeable battery is plugged in to charge., Heat is …
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the salt in the glass of saltwater is considered the (options: solute, …
A. solute
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select all the correct answers. fireworks are chemical reactions that r…
Muscles work to perform a task, Fuel burns and heats the surroundings, A battery supplies current to a device, A car's air bag expands by igniting a chemical.
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water is polar, what does that mean? it is a molecule with identical ch…
C. It is a molecule with opposite charges on opposite ends (assuming the orange option is labeled C; if labels are A - D: A. It is a molecule with identical charges on opposite en…
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1 - background information 2. the attraction that forms between atoms w…
First blank: covalent; Second blank: ionic ### Question 3
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1 - background information 2. the attraction that forms between atoms w…
First blank: covalent bond; Second blank: ionic bond ### Question 3
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what are the bonds called between a slightly positive hydrogen in a pol…
D. Hydrogen Bonds
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label these representations of an organic molecule as: ribbon diagram (…
1. Ribbon Diagram 2. Ball and Stick 3. Lewis Structure 4. Space - Filling
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14/10 what kind of molecule is water? scroll more nonpolar covalent ion…
C. Polar Covalent
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which of the following can water not dissolve? nonpolar compounds ionic…
A. Nonpolar Compounds
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which part of a water molecule has a positive charge? options: the bott…
C. The Hydrogen
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question # 7 multiple choice which of the following equipment would be …
A. hoses and nozzles
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which of the following is the correct molecular structure for water, h₂…
The first option (the one with the red atom (O) and two yellow atoms (H) in a bent arrangement) is the correct molecular structure for \(H_2O\).
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in the space below, write the longhand electron configurations of the f…
$1s^2 2s^2 2p^4$ ### 2) Iodine
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a water strider can skate along the top of a pond because: covalent bon…
D. hydrogen bonds result in water cohesion (surface tension)
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water is a universal solvent because it... scroll more ↓ it can be foun…
C. Dissolves most substances (assuming the red option is labeled C; adjust label if needed, but the text is "Dissolves most substances").
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large bodies of water do not quickly fluctuate in temperature. why? wat…
B. Water has a high heat capacity.
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why does ice float? water expands when it freezes, making ice less dens…
A. water expands when it freezes, making ice less dense than water
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the fact that ice floats on liquid water is due to the fact that water’…
3. less dense
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which part of a water molecule has a negative charge? options: the left…
C. The Oxygen
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lesson 6 what is a polymer? exists as either pure substances or mixture…
s for the blanks: 1. The first blank: $\boldsymbol{one}$ 2. The second blank: $\boldsymbol{element}$ 3. The third blank: $\boldsymbol{compound}$
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read this! the bonding electrons in some molecules are not equally shar…
To draw 10 water molecules forming a cluster with hydrogen bonds: ### Step 1: Represent a Single Water Molecule A water molecule ($\ce{H_2O}$) has a central oxygen (O, typically d…
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3 how many significant figures are in the result of 56.00 / 7.000? a 1 …
D. 4
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which of the following are effects of aging on the bodys tissues? ○ a c…
D. All of the listed responses are effects of aging on body tissues. (Note: Assuming the options are labeled A - D with the last option as D; if original labels differ, adjust acc…
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model 2 – attraction of water molecules image of water molecules with w…
The small, unshaded circles in Model 2 represent hydrogen atoms. ### Question 6b