Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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2hcl + na₂co₃ → h₂o + co₂ + 2nacl he mixes exactly 235.0 ml of 0.600 m …
HCl and \( \text{Na}_2\text{CO}_3 \) are both used completely.
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18. classify each reaction below using one of the 5 reaction types: syn…
DR #### Part b
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he adds 45.0 ml of 0.200 m kmno₄ to excess ethene (c₂h₄). what mass of …
\boxed{0.782} (Wait, but maybe the correct answer is 0.782 g, but let me check again. Wait 86.94 * 0.009 = 0.78246, so with three significant figures, 0.782 g. Alternatively, mayb…
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kai creates his potassium permanganate solution and combines it with et…
3. \( \ce{K+} \)
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kai wants to create 0.250 l of 0.200 m potassium permanganate solution.…
7.90 (or 7.902)
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what is the concentration of the compound kmno₄ in the particle model s…
The concentration of \( \text{KMnO}_4 \) is \( \boldsymbol{0.2\ \text{M}} \) (or \( 0.2\ \text{mol/L} \)).
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what is the concentration of the compound kmno₄ in the particle model s…
# Explanation: ## Step1: Count the number of \( K^+ \) and \( MnO_4^- \) ions From the particle model, count the gray ( \( K^+ \)) and purple ( \( MnO_4^- \)) particles. Let's say…
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what is the electrolyte capacity of the compound in the particle model …
1
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6. zns + alp → zn₃p₂ + al₂s₃
The balanced chemical equation is \( \boldsymbol{3ZnS + 2AlP ightarrow Zn_3P_2 + Al_2S_3} \).
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2. kbr + cl₂ → kcl + br₂
$$2\text{KBr} + \text{Cl}_2 ightarrow 2\text{KCl} + \text{Br}_2$$
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what volume, in ml, of 0.35 m ca(no₃)₂ is required to completely react …
\( \boxed{107} \)
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25 ml of hydroiodic acid generates 1.20 l of h₂ gas at stp conditions w…
\( \approx 4.28\ M \) (or more precisely, using exact calculations: \( \frac{2\times1.20}{22.4\times0.025}=\frac{2.4}{0.56}\approx4.2857\ M \))
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how many grams of mg(oh)₂ form when 75.0 ml of 0.60 m naoh react with e…
1.31
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what volume of vinegar is required to generate 945 ml of co₂ gas at stp…
\( 50.7 \) mL (or approximately 51 mL depending on rounding during steps)
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how many grams of al are needed to produce 0.450 l of 1.6 m alcl₃? 2al …
\( \approx 19.4 \) (or 19.43) grams
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which measurement is more precise? 0.25 grams 1.25 grams 0.005 grams 0.…
0.005 grams
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eugene describes the physical property of a material as \sweet and flor…
odor
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water is made of two hydrogen atoms and one oxygen atom bonded together…
Atoms remain bonded to each other in physical changes.
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what happens when a substance undergoes a physical change? some physica…
Some physical properties change, but the substance keeps its identity.
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part b: technology-enhanced (multiple select) 7. select two statements …
A. Zombie fires can burn underground for long periods of time, C. During burning, some matter becomes gases like \(CO_2\) and water vapor ### Part C (Question 8)
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practice: identify the following as being true or false to the left of …
1. True 2. True 3. False 4. True 5. False
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which of the following best describes peat? an unnatural flammable gas …
B. an early stage of coal formation (assuming the options are labeled A, B, C, D with the second option being B; if the original labeling is different, adjust the label but keep t…
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indicates a physical change. atomic theory bohr, democritus and rutherf…
1. **Atomic theory main points**: - Democritus: Matter is made of indivisible, indestructible atoms; different atoms have different shapes and sizes. - Bohr: Electrons occupy fixe…
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23. the element located in the 4th period and in group 11 is ______.24.…
23. Copper (Cu) 24. smaller 25. metals 26. valence electrons
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20. five unknown elements that are sealed in separate glass containers …
20. a. Elements 1, 2, 3 b. halogens: Element 5; noble gases: Element 4 c. Elements 1, 2, 3 d. 1: Aluminum; 2: Magnesium; 3: Calcium; 4: Helium; 5: Chlorine 21. BOTTOM, LEFT 22. TO…
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at what temperature does liquid water turn into steam? 212 degrees fahr…
A. 212 degrees Fahrenheit
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name: lucy egrions unit 1: atomic structure remember: - the # of proton…
### 1. Identify #p, #n, #e: - $_8^{16}\text{O}$: 8 protons, 8 neutrons, 8 electrons - $_{83}^{210}\text{Bi}$: 83 protons, 127 neutrons, 83 electrons ### 2. Write the symbol: - 36p…
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metalloid (md). 1. sodium na metal 2. silicon si metalloid 3. neon ne n…
1. Sodium $\boldsymbol{Na}$ $\boldsymbol{metal}$ 2. Silicon $\boldsymbol{Si}$ $\boldsymbol{metalloid}$ 3. Neon $\boldsymbol{Ne}$ $\boldsymbol{non-metal}$ 4. Calcium $\boldsymbol{C…
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8. ethyne, c₂h₂, is used in the process of gas welding. at 500.0 k, ( k…
\( Q_{eq} \approx 74.45 \), and the system will shift to the right (toward the products) to reach equilibrium.
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name: madison beutron date: 1/2=12024 per 2 more lewis structure practi…
To solve for the Lewis structure of \( \ce{H2O} \) (Water), we follow these steps: ### Step 1: Determine the total number of valence electrons - Hydrogen (\( \ce{H} \)) has 1 vale…
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name. date. per more lewis structure practice!!! formula name before af…
To determine the Lewis structure of \( \ce{CO2} \) (Carbon Dioxide), we follow these steps: ### Step 1: Calculate the total number of valence electrons - Carbon (C) is in Group 14…
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8 how many moles are in 1.00 g of propane (c3h8)? * enter your answer 9…
\( 0.0227 \) (or rounded as needed, e.g., 0.0227 mol) ### Question 9
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6 phenyl magnesium bromide is used as a grignard reagent in organic syn…
\( C_6H_5MgBr \) ### Question 7
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4 the empirical formula for trichloroisocyanuric acid, the active ingre…
s: Question 4: \( \boldsymbol{\text{C}_3\text{N}_3\text{O}_3\text{Cl}_3} \) (or \( \text{O}_3\text{C}_3\text{N}_3\text{Cl}_3 \)) Question 5: \( \boldsymbol{\text{C}_{10}\text{H}_{…
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the empirical formula of a hydrocarbon (compound that contains only c a…
\( C_6H_6 \)
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what causes different colors to appear in the sky? the absorption of li…
the scattering and reflection of light by dust particles
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question 3 (1 point) match the term with its definition: column a 1. ki…
1. Kinetic Energy - d. The energy associated with an object in motion 2. Chemical Potential Energy - b. The energy stored in the bonds of molecules 3. Conservation of Energy - a. …
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question 1 (1 point) what is the primary difference between hydrogen an…
1. Question 1: a. Hydrogen produces more energy per gram than gasoline 2. Question 2: b. The strength of the bonds formed or broken. 3. Question 3: 1. d. The energy associated wit…
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which of these work together to attach to rock to chemically change roc…
A. pioneer species
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question 37 (1 point) when is the inverter magnet system most stable? a…
d. When magnets are equidistant and balanced. --- # Question 38
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question 33 (1 point) modeling bond length which model uses small magne…
Question 33: a. Magnetic Marbles Model Question 34: a. The temperature increase in the room Question 35: False Question 36: c. It doesn't accurately simulate all types of molecule…
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question 29 (1 point) what determines if a reaction results in an incre…
Question 29: b. All of the choices Question 30: c. The end of the bond-breaking process Question 31: c. Combustion produces CO₂ and water as by-products Question 32: b. Transporta…
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question 25 (1 point) breaking bonds during a chemical reaction require…
Question 25: True Question 26: d. Observations about trends in the data. Question 27: a. Endothermic reactions Question 28: b. Bonds strengthen as atomic size decreases.
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question 19 (1 point) what happens to the overall energy in a reaction …
Question 19: b. Energy is released. Question 20: b. To track progress in understanding hydrogen combustion Question 21: d. Both physical (virtual) and computational models
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question 17 (1 point) why might hydrogen produce more energy per gram t…
Question 17: c. The combustion process of hydrogen releases a greater amount of heat Question 18: b. Renewable fuels tend to produce less CO2 than fossil fuels
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question 15 (1 point) what part of the simulation corresponds to bond b…
Question 15: b. The simulation shows particles moving apart and separating Question 16: d. The strength of the bonds being formed and broken differs.
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question 12 (1 point) what does the law of conservation of energy state…
Question 12: a. Energy remains constant and can only be transformed, not created or destroyed Question 13: True Question 14: d. The interaction between charged particles.
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question 10 (1 point) what happens when two bonded atoms are pushed clo…
Question 10: d. Repulsive forces increase significantly. Question 11: c. It is absorbed by the system.
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question 8 (1 point) match the material with its use in the syringe des…
### Question 8: 1. Hot Water - a. Provides the heat source to increase particle movement 2. Syringe - b. Shows the observable scale movement of particles 3. Thermometer - d. Measu…
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question 6 (1 point) what observation supports the idea that burning et…
Question 6: b. The ethanol produced heat and light during burning Question 7: b. Energy is being absorbed into the system.
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question 4 (1 point) data analysis what might \wanderings\ about the ch…
c. Predicting why bond energy decreases for larger atoms. --- # Question 5
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which of these elements forms the same number of covalent bonds (shared…
A. nitrogen
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oxygen difluoride (\\(\\ce{of2}\\)) and magnesium oxide (\\(\\ce{mgo}\\…
A. \( \text{OF}_2 \)
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for each nonmetal below, identify how many covalent bonds (shared elect…
| Element | Number of covalent bonds | |---------|--------------------------| | H | 1 | | C | 4 | | N | 3 | | O | 2 | | Br | 1 |
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apply: predicting covalent bonds google classroom microsoft teams you m…
A. hydrogen B. oxygen
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in general, nonmetals in the same form the same number of covalent bond…
group
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complete the statements. a single covalent bond involves shared pair(s)…
s: - Single covalent bond: 1 shared pair, 2 electrons total. - Double covalent bond: 2 shared pairs, 4 electrons total. - Triple covalent bond: 3 shared pairs, 6 electrons total. …
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complete the statement. in general, nonmetals in the same ______ form t…
B. group
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nonmetals form covalent bonds (shared electron pairs) with other atoms.…
C. the number of additional electrons the nonmetal needs to fill its valence shell
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(salts). three pure halogens: chlorine gas, liquid bromine, and solid i…
First dropdown: gain Second dropdown: 1 Third dropdown: negative
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which scenario is an example of a physical change? wood is burned in a …
Lead is melted into a liquid to form pellets.
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fill in the table by selecting the correct iupac name for each formula.…
To solve this, we analyze each chemical formula and correct its IUPAC name: ### For \(\boldsymbol{\ce{RbCl}}\): - \( \ce{Rb} \) is rubidium (not "rubidium" misspelled as "rubidium…
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which describes a feature of the physical changes of all substances? ca…
does not change the identity of a substance
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read the stanza from \the charge of the light brigade:\ \forward, the l…
AABBDDEEC
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the mass number of a nitrogen atom is 14. find its atomic number in the…
There are 7 neutrons.
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your answer is incorrect. decide what kind of crystalline solid each el…
### For \( \ce{F2} \): - Type of solid formed: molecular - Force holding the solid together: London dispersion forces ### For \( \ce{HOCl} \): - Force holding the solid together: …
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energy changes and rates of reaction 5. use hess’s law to calculate the…
\( \Delta H^\circ = -1628.2 \, \text{kJ} \)
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which statement primarily appeals to pathos to support the position tha…
If we want students to become well-rounded citizens who are passionate about lifelong learning, we must allow them to pursue their interests by taking elective courses.
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which phrase describes air density? increases as altitude increases equ…
equals mass divided by volume
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which statements correctly describe the properties of air? select three…
- B. Air pressure is created by the weight of the atmosphere pushing on Earth’s surface. - D. Denser air is heavier than less dense air. - E. Air is less dense at higher altitudes.
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4. name the following molecules using iupac rules.
- First Molecule: 3 - ethyl - 2 - methyl - 3 - hexene - Second Molecule: Pentanoic acid - Third Molecule: Propanal
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question 3 of 21 which of the following poems most clearly uses its rhy…
D. I see around you a corona of autumn leaves, / but then I think of death!
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the histogram represents the distribution of boiling temperatures, in d…
B. The distributions do not overlap on the same range of temperatures.
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a pure solid sample of substance x is put into an evacuated flask. the …
100 ### Second Question: Phase after 22 kJ/mol Heat
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which of the following equations best represents the reaction shown in …
4A + 2B → 4C + 4D (the first option)
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short answer questions answer the following short answer questions abou…
1. Sodium loses its single valence electron to become a positively charged cation ($\text{Na}^+$), while chlorine gains this electron to become a negatively charged anion ($\text{…
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which phrase defines altitude? how tightly molecules are packed a colum…
D. the height of a given point above sea level
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2 multiple choice 1 point which phrase describes a physical process tha…
D. Movement of air masses transfers heat from one region to another.
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when a dog eats its dinner, it converts ____ ______ from the food into …
Chemical Energy
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5. a natural gas stove converts chemical energy from burning into therm…
C. Transformation
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9. a natural gas stove converts chemical energy from burning into therm…
B. Mechanical Energy
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5. a natural gas stove converts chemical energy from burning into therm…
Thermal energy (the option corresponding to "Thermal energy" among the choices, likely the last option: "Thermal energy")
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5. a natural gas stove converts chemical energy from burning into therm…
C. Energy cannot be created or destroyed (assuming the third option is labeled C; if the original options have different labels, adjust accordingly to match the option text "Energ…
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balanced or unbalanced? determine whether or not the equation is balanc…
1. U 2. U 3. U 4. B 5. B 6. U 7. B 8. B
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name: date: period: counting atoms task cards directions: using the che…
- Number of oxygen atoms: 2 - Total number of atoms: 2
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name: date: period: counting atoms task cards directions: using the che…
- Nitrogen (N): 1 atom - Hydrogen (H): 4 atoms - Total atoms: 5
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name: date: period counting atoms task cards directions: using the chem…
- Ca: 1 atom - N: 2 atoms - O: 6 atoms - Total atoms: 9
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counting atoms task cards directions: using the chemical formula cards,…
- Aluminum (Al): 2 atoms - Sulfur (S): 3 atoms - Oxygen (O): 12 atoms - Total atoms: 17 Note: The formula for card 14 is cut off, so only card 13 ($Al_2(SO_4)_3$) can be solved wi…
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i organic chemistry: 3. draw structural, condensed or line structural d…
### 1. 3 - ethylhexan - 2 - ol #### Step 1: Identify the parent chain The parent chain is hexane, which has 6 carbon atoms. So the carbon skeleton of the parent chain is \( \text{…
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15. complete the ground state orbital - filling diagram and write the c…
s: a. $\boldsymbol{9}$ electrons. b. Element X is $\boldsymbol{\text{Fluorine (F)}}$, electron configuration: $\boldsymbol{1s^2 2s^2 2p^5}$
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what types of substances can be poured down a drain and rinsed with lar…
D. No chemicals at all!!
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are different forms of the same element and can provide clues about env…
I agree with the idea that using almost every part of the science payload (like SAM) to examine the Martian drift is a good approach for thorough scientific exploration, and that …
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2. a) draw the (horizontal) orbital diagram of gallium (ga). b) what ch…
(a): The orbital diagram for Ga is: \(1s\): \(\uparrow\downarrow\) \(2s\): \(\uparrow\downarrow\) \(2p\): \(\uparrow\downarrow\ \uparrow\downarrow\ \uparrow\downarrow\) \(3s\): \(…
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when moving from left to right across a period,the outer electrons feel…
a. Stronger, decreases
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the function of a biosafety cabinet is to exhaust chemical fumes out of…
True
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the atomic radius of aluminum is greater than ______. a thallium b gall…
c. Boron
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guiding question: how does a balanced equation demonstrate the law of c…
## Reasoning: A balanced chemical equation demonstrates the law of conservation of mass by ensuring the total number of each type of atom is identical on both the reactant and pro…
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worksheet 3: writing ionic compounds 1. write the chemical formula for …
a) $\text{NaCl}$ b) $\text{MgO}$
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worksheet 2: valence electrons and ion formation 1. how many valence el…
a) Na: 1 valence electron b) Mg: 2 valence electrons c) Al: 3 valence electrons d) Cl: 7 valence electrons e) O: 6 valence electrons
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b) it wears away rocks and soil from earths surface. c) it builds volca…
B. Wind, water, and temperature changes ### Question 7