Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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diamond is composed of carbon. a model of diamond’s atomic structure is…
Diamond consists of \boxed{carbon atoms}, therefore, it is a/an \boxed{crystalline} solid. Each carbon is held in place by \boxed{covalent} forces.
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the different melting points of sugar and salt can be explained using t…
| Chemical name | Table sugar (sucrose) | Table salt (sodium chloride) | | --- | --- | --- | | Chemical formula | $C_{12}H_{22}O_{11}$ | $NaCl$ | | Element types | Non - metals (C…
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the different melting points of sugar and salt can be explained using t…
Table sugar - Element types: Carbon, Hydrogen, Oxygen Table sugar - Type of solid: Molecular solid Table sugar - Type of electrical attraction which must be overcome to melt: Hydr…
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pure gold is called 24 - karat gold. typically, jewelry is not made of …
First blank: metallic; Second blank: able to slide past each other (or similar description about atomic mobility in metallic solids)
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model of silicas atomic structure consisting of silicon (gray) and oxyg…
silicon and oxygen atoms arranged in a continuous network network covalent strong covalent
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based on the lewis structures in the table above, determine the stronge…
acetone: dipole-dipole hexane: London dispersion forces water: hydrogen bonding Liquid A: hexane Liquid B: water Liquid C: acetone
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how many electrons would an element in group 16 have in its outer shell…
6
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solve for n in terms of p, v, r, and t. pv = nrt n =
$\frac{PV}{RT}$
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radioactive decay (aka transmutation) name _______________ period_____ …
1. Transmutation is the conversion of one chemical element or isotope into another. 2. Their nuclei are unstable (have too many protons/neutrons, or excess energy). 3. Half-life i…
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this problem requires multiple steps, check your work here (not scored)…
He: London dispersion forces $\text{H}_2\text{S}$: Dipole-dipole interactions $\text{H}_2\text{Se}$: Dipole-dipole interactions Ne: London dispersion forces He $\>$ Ne $\>$ $\text…
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radioactive decay (aka transmutation) name _______________ period___ 1)…
Transmutation is the conversion of one chemical element (or isotope) into another via nuclear processes (decay or bombardment), changing the atomic nucleus. ### Question 2: Why do…
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complete the table to compare the relative strength of each intermolecu…
London dispersion: Relative strength = Weakest, Energy needed to overcome = Least hydrogen bonding: Relative strength = Strongest, Energy needed to overcome = Most dipole-dipole: …
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complete the table to describe polar and nonpolar molecules. then, answ…
B. nonpolar Polar: Have individual bond dipoles that do not cancel out; Uneven charge distribution Nonpolar: Have individual bond dipoles that cancel out; Even charge distribution
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consider the following diagram of a hypothetical polar molecule, az. us…
### Intramolecular forces - Occur: Within a molecule - Overcoming these forces results in a: Chemical - Represented by the: Solid (or bold) ### Intermolecular forces - Occur: Betw…
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understand: intermolecular forces google classroom microsoft teams cons…
- Intramolecular forces - Occur: within a molecule - Intermolecular forces - Occur: between molecules
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quiz 1 use the periodic trend for electronegativity (en) to complete th…
polar covalent: The EN difference between atoms is... 0.4 to 1.7; The bonded electrons are... shared unequally nonpolar covalent: The EN difference between atoms is... 0 to <0.4; …
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use the periodic trend for electronegativity (en) to complete the table…
nonpolar covalent: The EN difference between atoms is... 0 to 0.4; The bonded electrons are... equally shared ionic: The EN difference between atoms is... > 1.7; The bonded electr…
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2ng + cl₂ -> 2nacl
The corrected, balanced chemical equation is: $$2\text{Na} + \text{Cl}_2 \xrightarrow{\Delta} 2\text{NaCl}$$ (Note: The original had typographical errors in element symbols; sodiu…
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crystals of xenon tetrafluoride if 0.880 grams of $\\ce{f_{2}}$ are pro…
2.39
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apply: mole calculations with compounds you might need: calculator, per…
129
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this problem requires two steps, check your first step here! (not score…
To solve the problem of determining the unknown salt, we first need to calculate the molar mass of the salt using the given table (which is not shown here, but we can calculate th…
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the average human body contains 32.4 moles of calcium, 99% of which is …
\( 1.95 \times 10^{25} \)
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a typical toy balloon holds $3.50 \\times 10^{23}$ atoms of helium. toy…
\( 0.581 \)
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most modern beverages are sold in aluminum cans. lightweight and flexib…
15.0
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the \welcome nugget\ was discovered by cornish miners in australia in 1…
350
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8. solid magnesium is placed in a solution of lead(ii) acetate 9. the h…
The balanced chemical equation is \(Mg(s)+Pb(CH_{3}COO)_{2}(aq)=Mg(CH_{3}COO)_{2}(aq)+Pb(s)\) ### For Question 9:
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animal money on display at the national history museum in kuala lumpur …
1351
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how many atoms of calcium are in the average human body? express your a…
$1.50\times10^{25}$
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a chemistry stockroom contains two bottles of sugar. bottle x contains …
C. Both bottles contain the same number of molecules. C. Both bottles contain the same number of carbon atoms.
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5. solid aluminum hydroxide is heated
The balanced chemical equation for heating solid aluminum hydroxide is $2\ce{Al(OH)_{3}(s)}\stackrel{\Delta}{=\!=\!=}\ce{Al_{2}O_{3}(s)}+3\ce{H_{2}O(g)}$
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the activity series of metals which of the following is most likely to …
B. Zinc is oxidized and copper is reduced.
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the chemical equation for this reaction is shown below.\\(\\ce{casio_3}…
calcium silicate ($\text{CaSiO}_3$): Reactant calcium fluoride ($\text{CaF}_2$): Product hydrofluoric acid ($\text{HF}$): Reactant silicon tetrafluoride ($\text{SiF}_4$): Product …
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the following diagrams represent opposite processes for the breaking do…
Bond breaking: Diagram A Bond forming: Diagram B Energy released (-): Diagram B Energy added (+): Diagram A Endothermic process: Diagram A Exothermic process: Diagram B
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a chemist bubbles chlorine gas through an aqueous solution of tin(ii) f…
E. No chemical reaction will occur.
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3. magnesium metal combines with nitrogen gas
To determine the chemical reaction when magnesium metal combines with nitrogen gas, we follow these steps: ### Step 1: Identify the reactants and products - Reactants: Magnesium (…
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a coil of magnesium ribbon what is the chemical equation for this react…
A. $\ce{Mg}(s) + 2\ce{HCl}(aq) ightarrow$ (assuming the product side is $\ce{MgCl_2}(aq) + \ce{H_2}(g)$ which is the correct product of the reaction between magnesium and hydrochl…
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aluminum shavings the activity series of metals which of the following …
C. Aluminum is oxidized and silver is reduced.
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old copper coins with a layer of copper(ii) oxide which of the followin…
D. Oxygen is reduced. E. This is a synthesis reaction
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（此处省略图像相关内容，仅保留选项相关文字：选项b、c、d，以及反应进程与势能的图像相关描述，如reactants、produ、reactio…
B. (The diagram labeled B, with reactants at a certain energy, a peak (activation energy), and products at lower energy than reactants)
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the following diagrams represent opposite processes for the formation a…
Bond breaking: Diagram B Bond forming: Diagram A Energy released (-): Diagram A Energy added (+): Diagram B Endothermic process: Diagram B Exothermic process: Diagram A
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energy diagram shows the changes in energy that occur over the course o…
A. The minimum energy required to initiate the reaction B. The overall energy change for the reaction C. The energy released as the product bonds form
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drag the right word to its definition in a solution, a substance that d…
The word that matches the definition "in a solution, a substance that dissolves another" is "solvent".
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drag over the word that goes best with the image
homogeneous
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combines with chlorine (a toxic gas) the atoms rearrange to form table …
- Sodium (Na) has a \(\boldsymbol{\text{coefficient}}\) of 2. - Chlorine (\(\text{Cl}_2\)) has a \(\boldsymbol{\text{subscript}}\) of 2 (or "number of atoms" depending on context,…
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drag the right word to its definition in a solution, a dissolved substa…
solute
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quiz 1 google classroom microsoft teams the equation for the synthesis …
A. $\ce{CH4(g) + 4Cl2(g) -> CCl4(l) + 4HCl}$ (assuming the full product for option A is as derived)
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drag over the word that goes best with the image compound solute mixture
mixture
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a is formed when atoms of two or more elements bond in a chemical react…
compound
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clean water from a public drinking fountain the chemical equation for t…
| Substance | State of matter | |--------------------|-----------------| | hydrochloric acid (HCl) | aqueous (aq) | | oxygen (O₂) | gas (g) | | water (H₂O) | liquid (l) | | chlori…
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drag the right word to its definition not the same throughout. homogene…
La palabra que corresponde a la definición "not the same throughout" es heterogeneous.
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a group of students was tasked with balancing the following equation.\\…
C. Both students' answers are correct.
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drag the missing word into place carbon and oxygen bond to form carbon …
compound
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the equation for the decomposition of potassium chlorate is shown below…
A. \( 2 \text{KClO}_3(s) ightarrow 2 \text{KCl}(s) + 3 \text{O}_2(g) \) (assuming the full option A is this balanced equation)
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apply: balancing equations google classroom microsoft teams the followi…
$1\ \text{N}_2\text{H}_4(l) + 3\ \text{O}_2(g) ightarrow 2\ \text{NO}_2(g) + 2\ \text{H}_2\text{O}(g)$
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apply: counting atoms in chemical equations google classroom microsoft …
10
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apply: counting atoms in chemical equations google classroom microsoft …
5
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apply: counting atoms in chemical equations you might need: calculator …
12
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apply: counting atoms in chemical equations google classroom microsoft …
27
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you might need: calculator how many oxygen atoms are on the left side o…
8
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a polynomial with three terms is known as a ______. adding or subtracti…
1. trinomial 2. physics (or other valid STEM fields like chemistry; trinomial is fixed, second blank has common valid answers like physics) 3. degree (or "form", "structure"; degr…
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a student notices that the periodic table has most of the elements with…
D. Nonmetals tend to be gases or liquids at room temperature and are found on the right side of the table.
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hydrogen is in group 1a of the periodic table, known as the alkali meta…
A. Hydrogen has a similar electron configuration as alkali metals.
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using the periodic table, elaborate the difference between the number o…
D. The number of electrons are the same for all isotopes of an element - so both oxygen - 16 and oxygen - 18 contain 8 electrons.
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using the periodic table and your knowledge of atomic structure. compar…
A. Both have 6 electrons.
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what can you conclude about the classification of krypton? a krypton is…
B. Krypton is a noble gas and has a full valence electron shell, is chemically non - reactive, and located in group 8A.
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consider the element carbon. how many electrons can be found in a carbo…
B. 6; 4
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illustrated here are three different ______ of carbon. they vary by the…
D. Isotopes; neutrons
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______ are atoms with the same number of protons, but differing numbers…
C. Isotopes
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an atom either gains or loses ______ to become an ion. a electrons b ne…
A. electrons
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chlorine forms the chloride ion to bond with many metals. to become a c…
C. gain one electron.
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bromine, chlorine, and fluorine are examples of ______. a halogens b me…
A. halogens
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a group on the periodic table is best described as a _______. a column …
A. column
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lithium, sodium, and potassium are examples of ______. a non - metals b…
B. alkali metals
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move the cards to match the name with the correct chemical formula. che…
$\ce{NH4OH}$ \> ammonium hydroxide $\ce{AlN}$ \> aluminum nitride $\ce{Al(NO3)3}$ \> aluminum nitrate $\ce{NH4NO2}$ \> ammonium nitrite $\ce{Al(OH)3}$ \> aluminum hydroxide $\ce{N…
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5. which of the following was not used to break through trench lines? a…
A. Mounted cavalry charges
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question an element with mass 310 grams decays by 8.9% per minute. how …
$54.2$
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4. based on your knowledge of ionic and covalent bonds, complete the mi…
| Name | Formula | Ionic or Covalent? | |---------------------|-----------|---------------------| | Beryllium bromide | $\text{BeBr}_2$ | Ionic | | Phosphorus trifluoride | $\text…
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which functional group is present in carbohydrates? see figures below. …
D. Hydroxyl (assuming the option for Hydroxyl is labeled as such; if the option identifier for Hydroxyl is, e.g., the fourth option, then the answer would be the option with "Hydr…
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7. a paperclip has a mass of 250 milligrams. how many grams is this? de…
0.25 grams
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in the picture below, which functional group in gray is a sulfhydryl gr…
E
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question 5 0.5 pts the molecules in the picture are ______. molecular s…
D. cis - trans isomers
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the density of a mystery metal is 455 noup/nollag. what is the density …
\( \approx 25.8 \text{ g/mL} \)
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33) an isotope has 15 protons, 16 neutrons, and 15 electrons. which of …
$\boldsymbol{P-31}$
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31) what is the atomic number of barium? (3pts) 56 137 27 13 32) isotop…
31) $\boldsymbol{\square}$ 56 32) $\boldsymbol{\square}$ atomic number.
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30) the element with atomic number 16 is (3pts) iron oxygen sulfur copp…
☑ sulfur
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29) which of the following statements about atomic structure is not acc…
Neutrons are slightly smaller than a proton and neutral in charge.
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27) what is the mass number of an atom that contains 23 protons, 23 ele…
27) D. 51 28) A. 24
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24) which pair of formulas illustrates the law of multiple proportions?…
$\boldsymbol{\text{CH}_4 \text{ and } \text{C}_8\text{H}_{18}}$ For question 25, the full options are not provided, so it cannot be answered. Please provide the complete options f…
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23) the specific heat of iron is 0.473 j/g°c. how much energy is requir…
757 J
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21) the quantity of heat required to raise the temperature of 1.0 gram …
□ specific heat.
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20) which of the following is a chemical change? (3pts) ice melts alcoh…
silver tarnishes
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19) which of the following is a physical change? (3pts) □ kerosene burn…
salt dissolving in water
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18) which of the following compounds would contain 6 atoms of oxygen? (…
$\boldsymbol{\text{Co(NO}_3\text{)}_2}$
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complete the rhyme scheme. a a b b c the great bare tree looked down an…
1. The great bare Tree looked down and smiled. - A 2. "Good-night, dear little leaves," he said; - B 3. And from below each sleepy child - A 4. Replied, "Good-night," and murmured…
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complete the rhyme scheme. two roads diverged in a yellow wood, and sor…
1. Two roads diverged in a yellow wood, → A 2. And sorry I could not travel both → B 3. And be one traveler, long I stood → A 4. And looked down one as far as I could → A 5. To wh…
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3 sara wants to dissolve these sugar cubes in water. list three ways sh…
1. Stir the water while adding the sugar cubes. 2. Use hot (or warm) water to dissolve the sugar cubes. 3. Crush the sugar cubes into smaller pieces (or a powder) before dissolvin…
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student - response activity 1 explain how you would separate a mixture …
To separate a mixture of salt and sand, follow these steps: 1. Add water to the mixture to dissolve the salt (sand is insoluble). 2. Filter the mixture to separate the sand (resid…
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1) choose the correct answer. the story line of fiddler on the roof cam…
1. D. Sholem Aleichem 2. A. Jewish; secular 3. D. watered-down
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7 a bottle of purple ink contains a mixture of red and blue dyes. which…
D. Paper chromatography
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4 what is the best method to test if an unknown sample of liquid is pur…
C. Measure its boiling point ### Question 5