化学
化学反応、化学量論、分子構造、元素の性質。
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what is atomic mass? how is it calculated? match the items in the left …
- The atomic mass of an element represents: the average mass of the isotopes that compose that element, weighted according to the natural abundance of each isotope - It is calcula…
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how does the absorption of light provide heat energy in the ocean? tiny…
When light is absorbed, molecules vibrate and electromagnetic energy is converted to heat.
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which of the following has the highest residence time? chloride (cl-) c…
Iron (Fe)
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the solid phase of water is less dense than the liquid phase. true false
True
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water dissolves more substances than any other liquid; it is not a \uni…
True
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the latent heat of seawater is different than pure water due to the dis…
True
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the polarity of water makes it able to dissolve many compounds. true fa…
True
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water has the highest specific heat of any liquid except ammonia. t/f
T
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chemistry lab and classroom worksheet answer the following questions on…
- Read the experiment’s instructions thoroughly. - Wear proper PPE (lab coat, goggles, gloves, closed - toe shoes). - Inspect all lab equipment for damage. - Organize and clear th…
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what is the average ph of the ocean? 7.5 8.1 7.0 8.7
B. 8.1
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1. classify each of the following elements as metal, non metal or metal…
- K: Metal - Xe: Non - metal - Ge: Metalloid - Pu: Metal - Ni: Metal - Kr: Non - metal ### Question 2
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which of the following statements is not correct? a calorie is the amou…
B. It takes more heat to melt one gram of ice than it does to boil one gram of water to water vapor
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which are the two most common ions in seawater are? bicarbonate (hco3-)…
D. chloride (Cl⁻) & sodium (Na⁺)
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b. mining and clear cutting in the canadian shield canadas mining indus…
Three valuable natural resources in the Canadian Shield are gold, silver, and timber (or any three from gold, silver, copper, zinc, lead, iron ore, uranium, nickel, or timber-rela…
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question 3 (4 points) why is it important to blend the powders using th…
The "doubling" (geometric dilution) technique ensures uniform blending, especially when ingredient quantities differ greatly. Blending all at once risks uneven distribution (segre…
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question 6 (4 points) what kind of mortar and pestle is most ideal for …
The most ideal mortar and pestle for many laboratory grinding procedures is Wedgewood (often agate - based Wedgewood - type). It is ideal because it is extremely hard and chemical…
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youve been asked to stabilize a compound whose general state is altered…
An alkali metal (e.g., Sodium, Na) Why? Alkali metals are highly electropositive, readily donating their single valence electron to neutralize the excess electrons in the compound…
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question 5 (4 points) what purpose does the sieve serve after triturati…
After trituration, a sieve serves to separate particles by size: it allows properly ground (small - sized) particles to pass through its openings while retaining larger, insuffici…
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one of us is lying chapter 8 bronwyn 1. true or false. after the funera…
Bronwyn shares that she got a B on her chemistry test (not the A+ her parents expected) and that she has been struggling with chemistry. ### Question 3
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capacity before moving on. - electrons on the outer most ring are known…
a. Element = Carbon (C); Valence Electrons = 4 b. Element = Phosphorus (P); Valence Electrons = 5 c. Element = Argon (Ar); Valence Electrons = 8 --- a. Nitrogen (N): Valence Elect…
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capacity before moving on. - electrons on the outer most ring are known…
### Problem 22 (assuming we analyze part a first, and we'll follow the same logic for b and c) #### Part a: # Explanation: ## Step 1: Count total electrons (protons = electrons in…
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chlorine-35 has 17 protons. how many protons and neutrons does the isot…
17 protons and 19 neutrons
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understand: collision theory google classroom microsoft teams according…
B. The reactants must collide with enough energy to break bonds. C. The reactants must be in a specific orientation.
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understand: collision theory the most common chemical reactions have tw…
C. It's more probable for two molecules to collide in the correct orientation than three or more molecules.
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complete the table to compare the properties associated with acidic and…
pH (Acidic): less than 7 pH (Basic): greater than 7 Conductivity (Acidic): conducts electricity Conductivity (Basic): conducts electricity Effect on litmus paper (Acidic): turns b…
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select the correct answer. what defines the mass number of an isotope? …
A. the sum of the neutrons and protons
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sports drinks contain useful electrolytes which of the following statem…
B. Strong electrolytes completely dissociate into ions in solution, resulting in high conductivity.
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you might need: periodic table move the cards to match the name with th…
HCl \> hydrochloric acid HClO₄ \> perchloric acid H₂SO₄ \> sulfuric acid H₂S \> hydrosulfuric acid HNO₃ \> nitric acid HNO₂ \> nitrous acid
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match the number of neutrons to the isotope. drag the items on the left…
- $_4^9\text{Be}$ → 5 - $_9^{19}\text{F}$ → 10 - $_{10}^{20}\text{Ne}$ → 10 - $_8^{16}\text{O}$ → 8 - $_3^7\text{Li}$ → 4
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apply: naming acids and bases google classroom microsoft teams you migh…
ammonium hydroxide: $\text{NH}_4\text{OH}$ (or $\text{NH}_3\cdot\text{H}_2\text{O}$) hydrochloric acid: $\text{HCl}$ acetic acid: $\text{CH}_3\text{COOH}$ (or $\text{C}_2\text{H}_…
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apply: naming acids and bases google classroom microsoft teams you migh…
$\text{HBr}$ \> hydrobromic acid $\text{HClO}_3$ \> chloric acid $\text{H}_2\text{SO}_4$ \> sulfuric acid $\text{H}_2\text{S}$ \> hydrosulfuric acid $\text{HNO}_3$ \> nitric acid …
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consider the elements in this family (group) of the periodic table. bec…
B. They are chemically reactive in a similar way.
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water is made from the elements hydrogen and oxygen. both are gases, bu…
C. A limited number of elements can combine in many ways to form all materials.
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the following model depicts two solutions containing two different acid…
Solution A is a strong acid. The acid molecules completely dissociate meaning it has a high concentration of $\text{H}^+$ ions. Solution B is a weak acid. The acid molecules parti…
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complete the table to compare the properties associated with acidic and…
pH (Acidic solutions): less than 7 pH (Basic solutions): greater than 7 Ions produced in solution (Acidic solutions): produce $\text{H}^+$ (or hydronium $\text{H}_3\text{O}^+$) io…
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quiz 1 google classroom microsoft teams complete the statements. - in a…
- In an aqueous solution, the $\boldsymbol{\text{solute}}$ is a solid, liquid, or gas that is evenly dispersed in the $\boldsymbol{\text{solvent}}$, which is always water. - A $\b…
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naphthalene methyl acetate molecular structure polar or nonpolar has ch…
To solve this, we analyze the properties of naphthalene and methyl acetate: ### Step 1: Recall Solubility Principles Water is polar ($\ce{H2O}$ has a bent structure, polar bonds, …
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a solution is a type of mixture. in a solution everything is evenly spr…
A. sugar water
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which statement best describes all matter on earth? a all matter on ear…
C. All matter is made from a limited number of elements that form compounds.
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specific heat capacity of water this problem requires multiple steps. c…
To solve the problem of calculating the thermal energy gained by water, we use the formula for heat transfer: \[ q = mc\Delta T \] where: - \( q \) = heat energy (J) - \( m \) = m…
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why does the smaller piece of butter melt more quickly? choose 1 answer…
C. Both pieces of butter have the same specific heat capacity, but there are fewer molecules in the smaller piece. Less thermal energy is required to raise their average kinetic e…
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what is the effect of the biogeochemical cycles? cycling energy through…
B. recycling matter through the biosphere
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choose 1 answer a 1,421.2 j b 1,776.5 j c 20,565.6 j d 62,867.2 j check…
\( 0.385 \)
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what is the primary reason the larger pot takes longer to boil? choose …
A. The water in both pots has the same specific heat capacity, but there are more water molecules in the larger pot. More thermal energy is required to raise their average kinetic…
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what is mary shelley casting blame on for victor’s negative choices (or…
Victor is primarily responsible for his own negative outcomes due to his selfish, unethical choices, rather than being a victim of circumstance. Two key quotes support this: 1. Hi…
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directions: label all your answers. 1) during transmutation (radioactiv…
1) 100 2) PARENT 3) STABLE; UNSTABLE 4) 6 hrs 5) 12.5 6) 87.5 7) 30 days; 75 days 8) 3.125 9) 6 m.y. 10) Parent %=25; Daughter %=75
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ure and electrostatic potential map london dispersion present? dipole-d…
methanol (CH₃OH): London dispersion present? Yes; Dipole-dipole present? Yes methane (CH₄): London dispersion present? Yes; Dipole-dipole present? No formaldehyde (CH₂O): London d…
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complete the table to describe polar and nonpolar molecules. then, answ…
A. polar Nonpolar: Individual bond dipoles cancel out; Charge distribution is symmetric Polar: Individual bond dipoles do not cancel out; Charge distribution is asymmetric
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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