Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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periodic table basics practice mark all that are made of diatomic molec…
- Bromine - Hydrogen - Nitrogen - Chlorine
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match the description to the element alkali metal with an atomic number…
### 1. Alkali metal with atomic number 19 - Atomic number 19 means 19 protons. Alkali metals are Group 1. Element: K (Potassium). ### 2. Most common mass number 70 - Mass number =…
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periodic table basics practice mark all that are correct about the elec…
- A neutron has no effect on a proton - A neutron exerts no electromagnetic force
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periodic table basics practice mark all that are correct about the elec…
- Electrons attract protons - A nucleus repels protons - A nucleus attracts electrons - An anion attracts a cation
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periodic table basics practice mark all that are correct about the elec…
- Opposite charges attract - Same charges repel - Two protons repel each other - Two electrons repel each other
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adapted from presidential retreat by the national parks service camp da…
It connects ideas in the text by explaining how the evidence relates to the argument
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has the largest atomic mass only alkali metal with no stable isotopes a…
To solve these matching problems, we analyze each clue: 1. **Largest atomic mass**: Typically, elements like Oganesson (but in common context, maybe Radon? Wait, no—Uranium? Wait,…
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periodic table basics practice match the description to the element ato…
To solve this, we match each description to the element using known atomic/mass numbers: 1. **Atomic mass of 91.224** → Zirconium (Zr) (atomic mass ~91.224) 2. **Atomic Mass of 11…
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periodic table basics practice choose all that apply to mercury □ trans…
- Transition Metal - Group 12 - 6 electron energy level - Period 6 - Same period as erbium - Same group as zinc - 80 protons - Liquid at room temperature
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periodic table basics practice choose all that apply to europium transi…
- Member of the lanthanide series - Period 6 - Unstable
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which of the following could not form an ionic compound? check all that…
The pairs that could NOT form an ionic compound are $\ce{F-}$ and $\ce{O^{2-}}$, $\ce{Ba^{2+}}$ and $\ce{Ag+}$.
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periodic table basics practice choose all that apply to plutonium □ tra…
- Transition Metal (checked) - 7 electron energy level (checked) - Member of the actinide series (checked) - Same period as seaborgium (checked) - Unstable (checked) (The other op…
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calculate the amount of heat needed to boil 24.0 g of water (h₂o), begi…
\( \boxed{59.0 \, \text{kJ}} \)
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periodic table basics practice choose all that apply to iridium ☐ trans…
- Transition Metal - Group 9 - 6 electron energy level - 77 protons - Same period as europium - Same group as cobalt - Same period as rubidium (Note: Rubidium is in Period 5, Irid…
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periodic table basics practice choose all that apply to silver transiti…
- Transition Metal - 5 electron energy level - 47 protons - Atomic mass of 107.868 - Same group as copper - Same period as xenon - Forms cations when reacting - Symbol is Ag
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17. explain the meaning of significant when describing an earth process…
A delta is formed when a river enters a standing body of water (e.g., ocean, lake). The river's velocity decreases, causing it to deposit the sediment (sand, silt, clay) it was ca…
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take electrons gasses at room temperature 7 elements along the metalloi…
To solve this matching problem, we analyze the properties of Metals, Metalloids, and Nonmetals: ### Metals: - **Groups 1 - 12**: Metals are in these groups. - **To the left of the…
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to the right of the metalloid line; medium amount of valence electrons;…
To solve this matching problem, we analyze each left - hand statement and match it with the appropriate right - hand concept (assuming the right - hand concepts are about metals, …
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question 5 what term matches the definition below? an undergraduate aca…
c. Bachelor’s Degree ### Question 6
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how does a pure substance differ from a mixture? check all that apply. …
- Every sample of a given pure substance has exactly the same characteristic properties. - Every sample of a given pure substance has exactly the same composition.
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nder – 200s (image of a graduated cylinder with markings: 40, 80, 120, …
195 mL
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if a sample of matter can not be separated and can not be decomposed by…
D. an element
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if a sample of matter can be separated and is not uniform in compositio…
C. a heterogeneous mixture
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magnesium, bromine, silicon, uranium, hydrogen, helium, boron, arsenic,…
To solve this, we classify each element into Metal, Nonmetal, or Metalloid: ### Step 1: Recall Element Categories - **Metals**: Typically shiny, good conductors (e.g., Mg, U, Pt, …
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ing with a grad owing graduated cylinders and determine the image of a …
60 mL
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only metal that is liquid at room temperature only nonmetal that is liq…
1. Only metal that is liquid at room temperature: Mercury 2. Only nonmetal that is liquid at room temperature: Bromine 3. Solid halogen with the smallest atomic mass: Iodine 4. Ga…
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ylinder - 10s (and a graduated cylinder diagram with markings 2, 4, 6, …
3 mL
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phet: states of matter name introduction: there are more states of matt…
Spacing: Particles are closely packed with little space between them. Motion: Particles vibrate in fixed positions (no free translational movement). ### For Question 3 (Cooling a …
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question 12 1. iron has three main isotopes. fe-54, fe-56 and fe-57. th…
56.18 (or 56.179, depending on rounding. If we use more precise calculation, the average atomic mass of iron is approximately 55.85, but wait, maybe I made a mistake in the isotop…
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alkali metal with 4 energy levels alkaline earth metal with 2 energy le…
To solve this matching problem, we analyze each description using the periodic table rules (period = energy levels, group = column): ### 1. Alkali metal (Group 1) with 4 energy le…
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snc2p chemistry unit 2. classify the following as a homogenous or heter…
Homogeneous #### b) Cherry vanilla ice cream
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chemistry matter review practice 1. classify the following as an elemen…
To solve this, we recall the definitions: - **Element**: Pure substance with one type of atom (e.g., Fe, Ag, Ne). - **Compound**: Pure substance with two+ different atoms (e.g., N…
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period 5 & group 11 period 7 & groups 17 period 7 & group 1 period 6 & …
To solve this matching problem, we analyze each description using periodic table rules (period = energy levels, group = valence electrons, noble gases have full valence shells, gr…
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question 20 the name of co₂(so₄)₃ is blank 1. blank 1 add your answer
cobalt(III) sulfate
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question 18 the formula for calcium nitrate is blank 1. blank 1 add you…
$Ca(NO_3)_2$ ### Question 19
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part d 80.732 g sn express your answers using four significant figures …
$4.094\times 10^{23}$ atoms
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part c 22.867 g pt express your answers using four significant figures
\( 7.059 \times 10^{22} \) atoms
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part b 49.858 g s express your answers using four significant figures n…
$9.364\times10^{23}$ atoms
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question 3 of 10 read these lines: that conqueredst alexandria by the r…
B. abaaca
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blank 1 is the name of alpo₄. add your answer
Aluminum Phosphate
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complete the sentences. the number of protons in the fluorine atom is b…
The number of protons in the fluorine atom is \(\boldsymbol{9}\), the number of electrons is equal to the number of protons, so the fluorine atom has a \(\boldsymbol{neutral}\) ch…
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part a 20.690 g cr express your answers using four significant figures …
\( 2.398 \times 10^{23} \) (or if using 52.00 g/mol, 2.396 × 10²³, but the more accurate molar mass gives 2.398 × 10²³)
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which of the following is an example of an atom? * 1 point ○ hydrogen ○…
A. hydrogen
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which of the following is an example of a compound? * hydrogen ocean wa…
C. sodium chloride
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blank 1 is the name of nullo3. blank 1 add your answer
Sodium Nitrate
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complete the sentences. the number of protons in the fluorine atom is l…
equal to
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page(s) 45-46 3.1. compare and contrast the types of bonds that form mo…
The order from strongest to weakest is covalent, ionic, hydrogen. So the sequence is: covalent, ionic, hydrogen.
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based on what you’ve learned about what happens when water freezes, whi…
# Brief Explanations: 1. Analyze "Salt generates covalent bonds with water and prevents freezing": Salt (ionic compound) forms ionic interactions with water (polar), not covalent …
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todo lo que te rodea —tu escritorio, el aire que respiras, incluso tu p…
Los átomos son los bloques básicos de construcción de la materia; todo lo que te rodea (escritorio, aire, propio cuerpo, etc.) está compuesto de ellos, y son tan pequeños que no s…
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1. define the following terms: | state | definition | sketch of atomic …
To complete the "Sketch of Atomic Arrangement" column for each state of matter: ### Solid - **Explanation**: In a solid, atoms (or molecules) are closely packed in a regular, repe…
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page(s) 51-53 3.5. explain the difference between hydrophilic and hydro…
Hydrophilic: ions, polar molecules, NaCl Not Hydrophilic: nonpolar molecules
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possible carbon replacement drag appropriate answer(s) here capable of …
### Possible Carbon Replacement: - capable of forming a large number of bonds - can form bonds with many other atoms - can form long chains or rings with other atoms - prefers to …
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3.5. explain the difference between hydrophilic and hydrophobic molecul…
Correct Answer(s): The solution becomes less acidic. The pH increases. Incorrect Answer(s): The solution becomes more acidic. The pH decreases.
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3.6. predict whether a solution has a high or low concentration of free…
Lemon juice, because it donates more $\ce{H+}$ ions than orange juice.
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using only these supplies, which question can adele investigate with an…
Does milk chocolate melt faster when heated in a microwave or on a stove?
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inquizitive: chapter 3: chemistry of life: breaking good inquizitive ch…
- Water molecules with dashed lines: hydrogen - Middle electron - sharing image: covalent - Na⁺ - related image: ionic
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calculate the amount of heat needed to boil 75.8 g of ethanol (ch₃ch₂oh…
To solve this, we need the following data (assumed or standard values for ethanol): - Melting point of ethanol: \(-114^\circ\text{C}\) (but we start at \(-13.1^\circ\text{C}\), so…
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question 15 potassium has two main isotopes, k-39 and k-41. the average…
6.5
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chapter 3: chemistry of life: breaking good page(s) 56-58 3.6. predict …
1. washing soda with a pH of 8 - 10 2. milk with a pH of 6.5 3. a solution of $\ce{H_2SO_4}$ with a pH of 2
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in the poems, how does shakespeare allude to, or refer to, ovid’s poem?…
B. by personifying time as cruel and destructive
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a chemist puts 0.1 liters of liquid in each of 12 beakers. how much liq…
\(1.2\) liters
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identify the location where you would expect to find a substance with t…
The location with the lowest \(H^+\) concentration is at the top of the scale, corresponding to pH 14 (the blue - topped area or the position labeled 14).
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match the type of bond to its description. drag each item on the left t…
- covalent → atoms that share electrons - ionic → attraction of a negatively charged atom or molecule with a positively charged one - hydrogen → a partially positively charged hyd…
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lecture activity no. 1 since we only have a 1-hour class schedule, this…
The formula mass of $\ce{CaCl2}$ is $\boldsymbol{110.98\ \text{g/mol}}$. ### Question 3:
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complete each sentence with a word or words from the word bank. not all…
### Across 2. **Answer**: loosely **Brief Explanations**: In liquids, molecular packing is less tight (more loose) than in solids. 3. **Answer**: shape **Brief Explanations**: Liq…
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for each of the noted items on the ph scale, match the label that indic…
- \(10^+\) → Milk (6.5) - \(100^+\) → Natural rainwater (5.6) - \(1000^+\) → Tomatoes (4.5) - \(10,000^+\) → Oranges (3.5) (Other substances like lemons, stomach acid, seawater, b…
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question 1 (multiple choice worth 4 points) (01.06r mc) which of the fo…
A. Cream and milk, because of their difference in density
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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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answer the following questions in the space provided. 24. explain how c…
Chemicals and chemical reactions are essential. Digestion (enzymes break food), respiration (glucose + O₂ produces energy), cleaning (detergents react with dirt), and photosynthes…
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5 why does rita describe the properties of elements that make up a comp…
B. To demonstrate how the properties of elements change after becoming a compound
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elements and compounds - 7.6a, 7.6b based on images, scientists believe…
Since no specific question is provided about this text, it's not possible to give a targeted answer. If you want to know about the scientific concepts (like elements/compounds in …
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unit 1 hw: atomic structure & properties part i: short response use the…
The empirical formula is \( \text{SiO}_4 \)? Wait, no—wait, recalculating: Wait, 14.0 g Si is \( 14 / 28.09 \approx 0.5 \) mol. 32 g O is \( 32 / 16 = 2 \) mol. So ratio Si:O is \…
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what product is formed in the hydration reaction shown below? alkene st…
The first option (the one with \(OH\) attached to the carbon with two methyl groups in the product structure)
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what is the structure of 3-methylcycloheptene? options with chemical st…
The second option (the one with the 7 - membered ring, a double bond, and a $CH_3$ group attached to the appropriate carbon)
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which term correctly describes the relative position of the two substit…
ortho
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14. milk souring p/c c 15. gasoline burning p/c c 16. ice melting p/c p…
**: C ### 15. Gasoline burning Burning gasoline (hydrocarbons + O₂ → CO₂ + H₂O) produces new substances.
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the contents on a box of cupcakes lists partially hydrogenated soybean …
B. It decreases the percent of unsaturation that is present.
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2. a cup of metal beads was measured to have a mass of 430 grams. by wa…
The metal is Copper (density calculated as $\approx 8.96\ \text{g/mL}$, matching copper's density).
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the molecules cis-2-pentene and trans-2-pentene are an example of a pai…
B. stereoisomers
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3. the gas state of a substances that is usually a solid or a liquid at…
vapor
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8. calculate the density in g/l if a block of silver (ag) has a mass of…
\( \approx2.04\times10^{-5}\space g/L \) (rounded to three significant figures)
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question 1 (10 points) listen what product is formed from the reaction …
The correct option is the one with the structure: \(\boldsymbol{\text{cyclopentane with a } -CH_3 \text{ group attached (the second option among the given choices)}}\) (in the for…
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1. a gas has no definite ____________ and no definite ____________.
A gas has no definite \underline{volume} and no definite \underline{shape}.
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1 a chemical is any substance that has definite, indefinite composition…
1. definite; all around us ### Question 2
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7. the density of lead is 11.342 g/ml. what would be the volume of a 20…
The volume of the lead sample is approximately $17634\space mL$ (or $17.634\space L$)
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triglycerides form when three fatty acid molecules combine with one mol…
3
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8. usually, stronger ________ forces between particles is linked to a g…
Usually, stronger $\boldsymbol{\text{intermolecular}}$ forces between particles is linked to a greater $\boldsymbol{\text{surface tension}}$ (or $\boldsymbol{\text{viscosity}}$, b…
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6. 28 g of iron shot is added to a graduated cylinder containing 40 ml …
The density of iron is $\boldsymbol{7\ g/cm^3}$ (or $\boldsymbol{7000\ g/L}$) ### Problem 7:
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5. what volume of silver metal will mass exactly 2500.0 g? the density …
The volume of silver metal is approximately $\boldsymbol{238.1\space cm^3}$ (or exactly $\boldsymbol{\frac{5000}{21}\space cm^3}$).
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3. what is the mass of the ethyl alcohol that exactly fills a 200.0 ml …
The mass of the ethyl alcohol is $157.8\ \text{g}$.
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3. the gas state of a substances that is usually a solid or a liquid at…
vapor
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parte 1a: análisis de documentos: analice los tres documentos siguiente…
To solve these questions, we analyze the document (Discurso de Miantonomo, tribu Narragansett, 1642) and answer each one: ### 1) ¿Qué sugiere Miantonomo que las tribus nativas ind…
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b. if the particles are randomly arranged, the solid is a(n) ______ sol…
amorphous
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a. when the particles are arranged in a specific, repeating order, the …
crystalline
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2. an element is a building block of choose an answer . the elements ar…
(for typical options): First blank: matter Second blank: in the periodic table Third blank: mass
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read the paragraph about what the endangered species act does. one sent…
The sentence to remove is: "Meanwhile, the Clean Air Act was passed to help keep dangerous chemicals out of the air."
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2. the type of solid depends on how the __________ in the solid are arr…
particles (atoms, ions, or molecules)
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1. drag and drop the label to the correct part of the entry for titaniu…
- A: name of element - B: chemical symbol - C: atomic mass
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matching: a) democritus b) dalton c) rutherford d) thomson 18. famous f…
C) Rutherford ### 19.
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16. which subatomic particle(s) will change the identity of the element…
a. proton ### Question 17