Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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at what temperature do molecules have no energy or motion? 100 degrees …
B. Absolute zero or 0 degrees Kelvin
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17. when the equation ▲fe₂o₃ + ▲h₂ → __fe + __h₂o is balanced using who…
C. 3
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17. when the equation 2.fe₂o₃ + _ h₂ → _ fe + _ h₂o is balanced using w…
B. 6
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question 91 (1 point) moriah has a nail deformity. the general term for…
a. onychosis ### Question 92
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which of the following atoms is the smallest? be o li b ne submit previ…
O (the option with "O" is correct, which is the second option in the list: "O" with the blue selected circle)
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which of the following atoms is the smallest? be o li b ne
O (the option with "O" as the atom, which was already selected in the provided image, but the correct atom is O)
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which of the following atoms is the smallest? be o li b ne
O (the option with "o" - note: likely typo for "O", Oxygen)
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the size of an atom generally increases: up a group and from right to l…
C. down a group and from right to left across a period. (Note: Assuming the options are labeled A - E, the third option is the correct one. If original labels differ, adjust to th…
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which of the following elements has the highest ionization energy? ba n…
B. Ne
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question 31 0 deg c = ---- deg f
32
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8. saskatchewan an materials are encouraged to carry a safety and survi…
a. -1653 kJ b. 236 J A. Faster moving particles have more kinetic energy than slower particles.
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3. consider this equation and its heat of reaction. 2c₄h₁₀(g) + 13o₂(g)…
3. b. \(2\text{C}_4\text{H}_{10}(g) + 13\text{O}_2(g) + 5320\text{ kJ} ightarrow 8\text{CO}_2(g) + 10\text{H}_2\text{O}(l)\) 4. A. Surroundings gain energy 5. c. II and III 6. d. …
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question 22 (1 point) what is the technical term for brittle hair? a pi…
d. Fragilitas crinium ### Question 23
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¿qué elemento representa la siguiente notación de caja: orbital filling…
O Ni
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¿cuál es el diagrama orbital correcto para un átomo de litio?
El diagrama orbital correcto para el litio es el que se encuentra en la esquina inferior derecha (con \(1s\) con dos electrones de espines opuestos, \(2s\) con un electrón y \(2p\…
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la configuración electrónica del cesio, número atómico 55, es xe 6s¹. ¿…
Período 6
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¿cuál es el elemento con la configuración electrónica kr 5s² 4d¹⁰ 5p⁵ ○…
Yodo - I
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¿cuál es la configuración electrónica de un ion óxido (o²⁻)? ○ 1s²2s²2p…
\(1s^2 2s^2 2p^6\) (the option with this configuration, likely the bottom - right or as per the visual: the option \(1s^2 2s^2 2p^6\))
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¿qué configuración electrónica tiene tres orbitales medio llenos? ○ 1s²…
\(1s^2 2s^2 2p^3\) (la opción del segundo renglón, segunda columna)
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4-3 exercises a 1. the sum of a certain number and a second number is -…
The first number is 5 and the second number is -47. ### Problem 2:
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the ph readings for wines vary from 3.2 to 4.2. find the corresponding …
\(6.31\times 10^{-5}\leq[H^+]\leq6.31\times 10^{-4}\) (the first option)
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the hydrogen ion concentration of a sample of each substance is given. …
(a) The pH of oranges is approximately 3.6. (b) The pH of tomato juice is approximately 3.5. (c) The pH of seawater is approximately 8.3.
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6 forms of energy that can be converted to heat energy mechanical energ…
- mechanical energy: friction - electrical energy: light bulb - chemical energy: burning wood - radiant energy: infrared rays - nuclear energy: fission - sun: nuclear reactions tr…
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8. aisha is a new student at her school. her classmates are all friendl…
B. They are referring to an in - joke.
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2. the statue of libertys green color comes from a patina, $\\ce{cu2so4…
Copper (Cu) is likely to have a larger first ionization energy than tin (Sn).
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1. based on their positions in the periodic table, predict which has th…
Cs (Cesium) has the smallest first ionization energy among Li, Cs, N, F, I.
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1. based on their positions in the periodic table, predict which has th…
Cs (Cesium) has the smallest first ionization energy.
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1. based on their positions in the periodic table, predict which has th…
Cs (Cesium)
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is the study of the transfers of energy as heat that accompany chemical…
Thermochemistry
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match the following terms to the correct definition: a dynamic conditio…
- "A dynamic condition in which two opposing changes occur at equal rates in a closed system" - Equilibrium - "Any part of a system with uniform composition and properties" - Phas…
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3 fill in the blank 1 point complete the following statements: - answer…
- First statement: Answer (liquid description): volatile; Answer (force): weak - Second statement: Answer (liquid description): nonvolatile; Answer (force): strong
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8 multiple choice 1 point the ph of a 0.500 m aqueous solution of ba(oh…
14.000 (The correct option is the one with 14.000, as calculated from the dissociation of $\text{Ba(OH)}_2$ and the pH - pOH relationship.)
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question 24 (1 point) enter the measurement of the water in the graduat…
Question 24: 45 Question 25: 2.5
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22. circle the atom in each pair that has the greater electronegativity…
Ga #### b) Li vs O
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complete the sentences with the correct words. before class, the chemis…
1. formulated 2. materials 3. barrages 4. unfolded 5. rhythms
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13. when a chlorine atom forms an ion its radius increases, but when a …
Chlorine gains an electron (increasing electron - electron repulsions and keeping effective nuclear charge similar, expanding the electron cloud). Sodium loses a valence electron …
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3. give two examples of elements for each category. \ta) noble gases\t\…
## Problem 3 a) Noble gases: Helium (He), Neon (Ne) b) Halogens: Fluorine (F), Chlorine (Cl) c) Alkali metals: Lithium (Li), Sodium (Na) d) Alkaline earth metals: Magnesium (Mg), …
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19. what is the molar mass of a nonpolar molecular compound if 3.42 g d…
C. 96.7 g/mol
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18. what is the boiling point of a solution containing 0.80 g caffeine,…
C. 80.9 °C
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17. the vapor pressure of pure water at 35 °c is 42.2 mm hg. what is th…
E. 41.8 mm Hg
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16. a sulfuric acid solution that is 65.0% h₂so₄ by mass has a density …
C. 10.3 M
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5. what is the molality of a 13.82 % by mass glucose solution? the mola…
C. 0.8901 m
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test yourself 1 what is the volume of ( 1.204 \times 10^{23} ) molecule…
c. 44.8L
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q2 the rate of a slow metabolic reaction is sped up by the addition of …
5. Decrease the free energy required to reach the transition state
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water: a cool molecule teen channel: science scene the shape of water m…
### Surface Tension: - **Cause**: Water molecules are polar (oxygen is electronegative, creating partial positive/negative charges). Hydrogen bonds between \( \ce{H2O} \) molecule…
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water: a cool molecule teen channel: science scene while walking to sch…
D. It’s the reason a drop of water has a spherical shape.
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draw the following lewis structures: $ph_3$ $cn^-$ $h_2s$ $hf$ $cs_2$ $…
### Lewis Structures: - \(PH_3\): P as central, 3 single bonds to H, 1 lone pair on P. - \(CN^-\): C and N triple - bonded, C has 1 lone pair, overall - 1 charge (total valence el…
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instructions 1. draw the following resonance structures: - $co_{32}^-$ …
### Resonance Structures and Molecular Geometry - \( \boldsymbol{CO_3^{2-}} \): 3 resonance structures (double bond with each O), trigonal planar. - \( \boldsymbol{O_3} \): 2 reso…
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water: a cool molecule teen channel: science scene while walking to sch…
B. The molecule has opposite charges on each end.
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use the formula $ph = -logh^+$, where $h^+$ represents the concentratio…
2.10
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which of these is not a way sedimentary rock is made? a from fragments …
d. Cooled magma
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clastic sedimentary rock forms as sediments are compacted and cemented …
precipitate
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what potential risks are associated with consuming substances that alte…
C. engaging in potentially dangerous behaviors
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which of the following statements correctly describes the pollutants re…
C. Factories release greenhouse gases and particulate matter into the environment. (Here we assume the options are labeled A, B, C in order from top to bottom as is common in mult…
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in the early 1900s, what trend emerged concerning chemical weapons? ○ c…
A. Chemical weapons became deadly, as did other aspects of warfare.
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note that a peroxyacid contains one more oxygen atom than does a carbox…
The carbon - carbon double bond (the alkene moiety) in the cyclohexene ring is susceptible to the attack of peroxyacetic acid, and the product will have an epoxide ring formed at …
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which human activity would be most likely to have a negative impact on …
C. Burning coal and oil to generate electric power.
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balance the following chemical equation: fe(oh)₃ → fe₂o₃ + h₂o
The coefficients are 2 (for $\ce{Fe(OH)3}$) and 3 (for $\ce{H2O}$), so the balanced equation is $\boldsymbol{2\ce{Fe(OH)3} ightarrow \ce{Fe2O3} + 3\ce{H2O}}$
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physical and chemical changes note-taking guide directions: complete th…
1. For the first blank (how the paper changes when folded/cut): The shape (or size) of the paper changes. No new substance is formed. 2. For the second blank (type of change for f…
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differentiating chemical changes directions: complete the tasks by writ…
When we burn paper to start a campfire, the paper undergoes a **chemical change**. In this process, the paper (composed of organic compounds like cellulose) reacts with oxygen fro…
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which group of coefficients balances the following chemical equation? 2…
a. 2, 3
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physical and chemical changes directions: contemplate the note-taking g…
The subfield is Chemistry (under Natural Science). For the fill - in - the - blanks (assuming typical answers): - "A single piece of paper can be torn up or cut into many \(\bolds…
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skill level: to be determined i which group of coefficients balances th…
c. 2, 3
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a ____ is a chemical or a combination of chemicals that can take up exc…
buffer
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capd is so named because the ________ of the abdominal cavity is the di…
1. peritoneal lining 2. dialysate 3. Waste; Water (or Waste; Salt) 4. gravity
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fill in the blank question the atomic mass of an element is not a whole…
First blank: average; Second blank: numbers of neutrons (or neutron numbers, or masses - but more accurately, numbers of neutrons as the reason for different masses)
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glomerular filtrate contains small, dissolved molecules in approximatel…
blood plasma
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compare the student text with the source. source: carolyn williams, \a …
Yes, because it fails to use quotation marks and fails to cite the source.
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the diagram shows the electron configuration of an atom of an element f…
13
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name: _______________ name: _______________ 5) calcium + chlorine 6) ma…
5) Formula: $\boldsymbol{CaCl_2}$, Name: Calcium Chloride 6) Formula: $\boldsymbol{MgF_2}$, Name: Magnesium Fluoride 7) Formula: $\boldsymbol{KBr}$, Name: Potassium Bromide 8) For…
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1)sodium + chlorine formula: _______________ name: _________________ 2)…
1) Formula: $NaCl$, Name: Sodium Chloride 2) Formula: $KI$, Name: Potassium Iodide 3) Formula: $MgO$, Name: Magnesium Oxide 4) Formula: $CaS$, Name: Calcium Sulfide
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3. **explain what a crystal lattice structure is.
A crystal lattice structure is a periodic, three-dimensional arrangement of atoms, ions, or molecules in a crystalline solid, defined by a repeating unit cell whose translation ge…
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name teacher: date: q2 chemistry: u4l3.5 lattice structure intro prepwo…
| Element Pair | Lewis Dot Diagram of Ionic Compound | Formula | Name | |---------------------|------------------------------------------------------------------------------------…
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click the \investigation\ tab and break all the bonds in the reactants.…
\(-802\)
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multiple choice 1 point 1 what is this an example of? (pizza with toppi…
Heterogenous mixture (the option labeled "Heterogenous mixture")
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following an accident at work where chemicals splashed in his eyes, the…
d. scleritis Wait, correction: Wait, no—scleritis is inflammation of the sclera (the white outer layer). But chemical splash causing inflammation of the white part—wait, conjuncti…
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pq-13. the lewis dot structure of ethanol is given below. estimate the …
B. -1255 kJ·mol⁻¹
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read the passage. there are several questions about the passage. stinki…
4. Large quantities of sulfur make Io the smelliest place in the Solar System. ### Part B
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limestone is mostly made of sediment and the fossilized remains of anci…
| Process Description | Chemical Weathering | Gas Exchange | Limestone Formation | |---------------------|---------------------|--------------|---------------------| | Carbon from…
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match each hydrate formula with the correct chemical name. mgso₄·h₂o mg…
- \( \text{MgSO}_4 \cdot \text{H}_2\text{O} \) → Magnesium sulfate monohydrate - \( \text{MgSO}_4 \cdot 2\text{H}_2\text{O} \) → Magnesium sulfate dihydrate - \( \text{MgSO}_4 \cd…
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hands-on labs periodic table of elements h pb h₂so₄ 74 g/mol ca(oh)₂ 98…
- \( H_2SO_4 \) → 98 g/mol - \( Ca(OH)_2 \) → 74 g/mol - \( CuSO_4 \cdot 5H_2O \) → 250 g/mol (or 255? If Cu=63.5, S=32, O=16, H=1: 63.5+32+64 + 5*(18)=159.5+90=249.5≈250 or 255? …
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match each term with the best description. - chemical equation - hydrat…
- Chemical equation: An illustration of the reaction that occurs between two or more chemical compounds - Hydrate: A solid compound that contains water molecules - Mole: Unit of m…
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part 5. physical/chemical properties and changes -see daily review #3 i…
Density is calculated by dividing mass by volume, using the formula \( ho = \frac{m}{V} \) (or "Density = Mass / Volume"). ### Question 35: What is the density if the mass is 21 g…
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select 2 examples of endothermic processes. sulfuric acid & magnesium, …
The two examples of endothermic processes are: the option with "photosynthesis" and the option with "melting ice" (assuming the options are labeled as per the text, e.g., if the s…
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what is the shape of the ozone (o3) molecule? a linear b bent c trigona…
B. Bent
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noble gases - complete outer shells (8 valence electrons w/ 1 exception…
Hydrogen is an exception to Group 1 (alkali metals) because it has 1 valence electron (like Group 1) but lacks metallic properties (e.g., not a solid metal, no metallic conductivi…
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when infrared radiation is absorbed by a greenhouse gas molecule, the m…
- Greenhouse gas molecules gain energy after absorbing infrared radiation. - Greenhouse gas molecules absorb and release infrared radiation.
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if salt ($5.99 \\times 10^{-6}$ mol) is dissolved in $1.50 \\times 10^{…
3.99 × 10⁻⁴ M (corresponding to the option "3.99 × 10⁻⁴ M")
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if the scientists had repeated the steps used in study 2 at 1,500°c, th…
A. below 100 poises.
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which of the following were independent variables in study 2? a type of…
C. Type of mineral added, temperature, and amount of mineral added only
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baking & pastry final review strand 1 - safety and sanitation 1. list 4…
The relevant subfield under Natural Science is likely "Medicine and Health" (or a related subfield like "Others" if considering food - specific safety) as the questions deal with …
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read the text. then answer the question. molecules of nitrogen (n₂) and…
400
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based on the results of study 1, what is the ratio of cao to mgo in lip…
C. 4:1
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according to figure 1, the viscosity of the sample with 2 parts of mgo …
B. \(1,300^{\circ}C\)
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how many valence electrons does si have? ②nitrogen n-14 p= n= e= draw n…
Silicon (Si) has 4 valence electrons. Nitrogen (N) has 5 valence electrons. Bohr model of N - 14: Nucleus with 7 protons and 7 neutrons, first energy level with 2 electrons, secon…
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read the passage. there are several questions about this passage. stink…
3. the contrast between the smell of Io and other smelly places in the Solar System
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question 1 (1 point) balance the equation using numbers 1 to infinity. …
Blank 1: 1 Blank 2: 5 Blank 3: 3 Blank 4: 4
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review sheet 1. evidence of continental drift how did scientists use fo…
s #### 1. Evidence of Continental Drift - Fossils: Identical fossils on separated continents (no ocean crossing) show continents moved. - Plants: Same plant fossils on distant con…
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why was the weigh/filter paper used in this experiment? check all that …
- to weigh the tablet - to make sure that all of the broken pieces of tablet were added to the water - to prevent the tablet from absorbing water - to allow for fair comparison of…
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your stomach is upset. you want relief - and fast! what actions could y…
- heating the water even more - breaking the tablet into smaller pieces - decreasing the amount of water - heating the water and breaking the tablet at the same time (Note: The ch…