Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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key vocabulary reactants, products, coefficients, subscripts, balanced …
\( 2 \) \( \text{Na} + 1 \) \( \text{Cl}_2 ightarrow 2 \) \( \text{NaCl} \) (Coefficients: 2, 1, 2) ### Problem 21:
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1. identify reactants and products: a) na + cl₂ → nacl 2. what does the…
Reactants: Sodium (\( \text{Na} \)), Chlorine (\( \text{Cl}_2 \)); Products: Sodium Chloride (\( \text{NaCl} \)) ### 2.
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d. if 30.6 g of methanol (ch₃oh) is used to start a fire, how many mole…
Approximately $5.75\times10^{23}$ molecules
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d. if 30.6 g of methanol (ch₃oh) is used to start a fire, how many mole…
Approximately $5.75\times10^{23}$ molecules of methanol were used.
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0.200 grams of di water is added to 4.93 grams of tert - butyl alcohol.…
\(8.45\ ^{\circ}\text{C}/m\) (or a value close to it depending on more precise calculations)
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0.500 grams of an unknown alcohol is added to 4.71 grams of tert - buty…
$\approx 46.8 \text{ g mol}^{-1}$ (or more precise value depending on calculation steps, e.g., if we use more precise values during calculation: $m=\frac{18.98}{8.37}\approx2.2676…
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short question why standard state is used for enthalpy changes?
Standard state is used for enthalpy changes to provide a consistent, universal reference point. Since absolute enthalpy cannot be measured, this defined set of conditions (1 atm, …
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identify whether each pair of reactants will react or not react. react …
## React: $\text{Al}(s) + \text{CuSO}_4(aq)$ $\text{Ca}(s) + \text{Pb(NO}_3\text{)}_2(aq)$ $\text{Ag}(s) + \text{HNO}_3(aq)$ ## Do not react: $\text{Zn}^{2+}(aq) + \text{SnCl}_2(a…
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which is a concept that helps increase short - term memory? ○ repetitio…
repetition
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question 28 (1 point) listen which of the following binary ionic compou…
d) potassium cyanide, KCN
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question 27 (1 point) listen which of the following binary ionic compou…
c) iron (III) bromide, $\text{FeBr}_3$ e) magnesium chloride, $\text{MgCl}_2$
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question 26 (0.5 points) listen which of the following compounds are na…
a) $\text{I}_2\text{O}_7$ - diiodine heptoxide c) $\text{CO}_2$ - carbon dioxide e) $\text{Br}_2\text{O}_3$ - dibromine trioxide
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practice unit 3 - spring 2026 question 25 (0.25 points) listen what is …
e) $S_2F_{10}$
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question 24 (0.25 points) listen what is the correct formula for the co…
c) $\text{CBr}_4$
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question 23 (0.25 points) listen what is the correct formula for the co…
b) $\text{Si}_3\text{N}_4$
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question 22 (0.25 points) listen what is the correct iupac name for p₃n…
d) triphosphorus pentanitride
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question 21 (0.25 points) listen what is the correct iupac name for \\(…
d) tetraphosphorus decoxide
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label the following compounds as molecular or ionic from their chemical…
- $\text{GaCl}_3$: 2. Ionic - $\text{ScN}$: 2. Ionic - $\text{P}_4\text{O}_{10}$: 1. Molecular - $\text{Na}_2\text{O}$: 2. Ionic - $\text{Bi}_2\text{S}_3$: 2. Ionic - $\text{CdSe}…
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question 19 (1 point) listen match the following elements to their grou…
- Iodine (I): 3. $\text{[Kr]} 5s^2 4d^{10} 5p^5$ - Zirconium (Zr): 6. $\text{[Kr]} 5s^2 4d^2$ - Arsenic (As): 1. $\text{[Ar]} 4s^2 3d^{10} 4p^3$ - Cadmium (Cd): 5. $\text{[Kr]} 5s…
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match the following elements to their ground - state electron configura…
- Beryllium (Be): 2. $1s^22s^2$ - Boron (B): 6. $1s^22s^22p^1$ - Fluorine (F): 4. $1s^22s^22p^5$ - Neon (Ne): 5. $1s^22s^22p^6$ - Sodium (Na): 7. $1s^22s^22p^63s^1$ - Nitrogen (N)…
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question 9 (0.25 points) listen what is the ground - state electron con…
$1s^22s^22p^63s^2$ --- ### Question 10
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question 5 (0.5 points) listen which of the following statements are tr…
- The only allowed values for $m_s$ are +1/2 and -1/2 - If $l = 0$, the electron must be in an s-orbital. - If $m_l = 2$, the electron must be in a d-orbital. --- ### Question 6
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match the element name with its correct symbol. barium bismuth 1. b bor…
- barium: 3. Ba - bismuth: 4. Bi - boron: 1. B - berkelium: 7. Bk - beryllium: 2. Be - bromine: 6. Br - bohrium: 5. Bh --- ### Second Multiple-Choice Problem
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match the element name with its correct symbol. sulfur silver 1. ag tin…
- sulfur: 3. S - silver: 1. Ag - tin: 9. Sn - scandium: 5. Sc - strontium: 6. Sr - selenium: 4. Se - antimony: 10. Sb - silicon: 8. Si - seaborgium: 7. Sg - sodium: 2. Na
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Question was provided via image upload.
## Completed Table: | Element | Quantum Numbers (for one valence e⁻) | Orbital diagram of valence electrons | Electron configuration | |-----------|-------------------------------…
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table 1. complete the following table: | element | quantum numbers | or…
| Element | Quantum Numbers | Orbital diagram of valence electrons | Electron configuration | |-----------|------------------------------------------------------------------------…
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low energy to high energy-order of filling 1s 2s 2p 3s 3p 4s 3d 4p 5s 4…
Scandium: $\boldsymbol{[Ar]4s^23d^1}$ Iron: $\boldsymbol{[Ar]4s^23d^6}$ Gallium: $\boldsymbol{[Ar]4s^23d^{10}4p^1}$ Cadmium: $\boldsymbol{[Kr]5s^24d^{10}}$ Lead: $\boldsymbol{[Xe]…
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- magnetic quantum number (m) - magnetic spin number (mₛ) atomic orbita…
- **s-orbital**: A single, hollow sphere centered on the atomic nucleus. - **p-orbitals**: Three separate dumbbell shapes, each aligned along one of the three Cartesian axes (x, y…
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a compressed spring has; chemical energy gravitational potential energy…
C. Elastic potential energy
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which type of energy transformation occurs when a stretched rubber band…
A. Potential to kinetic
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question 5 (2 points) what is the theoretical yield in grams of hydroge…
0.227
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how many atoms of hydrogen are in 1.255 grams of aluminum hydroxide? 0.…
2.906 × 10²² H atoms (the last option) ### Second Question (Balanced Reaction)
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when balanced, what is the stoichiometric coefficient on lioh?\ $\\ce{h…
two ### Question 2:
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this question has multiple parts. work all the parts to get the most po…
s: a. \( \boldsymbol{\ce{_{19}^{39}K}} \) b. \( \boldsymbol{\ce{_{36}^{84}Kr}} \) c. \( \boldsymbol{\ce{_{13}^{27}Al}} \)
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how many electrons, protons, and neutrons are present in an atom of pho…
electrons = 15 protons = 15 neutrons = 17
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the ions get sorted based on their size and a detector records each typ…
B. Different isotopes
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answer the following questions to determine what nanoscale species are …
A. Electrons
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question 6 of 10 choose the statements that are true about hydrogen and…
C. When hydrogen has two electrons in its valence shell, it has a full valence shell. D. Hydrogen can bond with oxygen to make water.
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question 5 of 10 select the statements that are true about electronegat…
B. If the difference in electronegativity is 0 to 0.5, the bond will be nonpolar covalent.
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match the term to its definition. covalent ? composed of two atoms diat…
Diatomic: Composed of two atoms Polar: A bond with unequal sharing of electrons Nonpolar: A bond in which neither atom takes more than its share of electrons Covalent: A bond in w…
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each case, he fills a reaction vessel with some mixture of the reactant…
For the first reaction (\( \text{PbSO}_4(s) + 4\text{H}_2\text{O}(l) ightarrow 4\text{H}_2\text{O}_2(l) + \text{PbS}(s) \)): - \( \Delta G = \boxed{22} \, \text{kJ} \) - Spontanei…
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1. isotopes are often named using hyphen notation, which tells us the e…
Hyphen notation (e.g., Element - MassNumber) is useful for representing isotopes because it clearly provides the element name (defining the number of protons) and the mass number …
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1. isotopes are often named using hyphen notation, which tells us the e…
Hyphen notation (e.g., Element - MassNumber) is useful for isotopes as it directly provides the element name and its mass number. Isotopes of an element have the same atomic numbe…
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section 5: journey to pyramids & the treasure word search! abrade besee…
Paulo Coelho sends Santiago to Egypt and has the treasure in Spain to highlight that the journey (with its lessons, self - discovery, and growth) is the true treasure. The physica…
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each case, she fills a reaction vessel with some mixture of the reactan…
### First Reaction: \( \boldsymbol{2\text{Al}(s) + 3\text{H}_2\text{O}(g) ightarrow \text{Al}_2\text{O}_3(s) + 3\text{H}_2(g)} \) #### Step 1: Convert temperature to Kelvin The te…
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levi adds 26 grams of lead(ii) nitrate (pb(no₃)₂) into 25 grams of wate…
6 grams
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lola adds 29 grams of sodium nitrate (nano₃) into 25 grams of water (h₂…
4 grams
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what is the best description of argentinas dirty war that lasted from 1…
D. a period of repression and human rights abuses committed by military rulers
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in the formation of a black hole, which step happens before stars emit …
C. A chemical reaction begins to take place
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using the appropriate bond energies, calculate the heat of reaction \\(…
$-806\ \frac{\text{kJ}}{\text{mol}}$
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multiple choice question what is the largest source (volume) of groundw…
A. Agricultural chemicals and wastes
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select all that apply which of the following statements most accurately…
A. Bottled water is sometimes sourced from groundwater aquifers, which may not be tested for quality. B. Tests have found that some bottled water contains pathogens or toxins that…
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3. determine which of the values in the first row need to be used for e…
\( 1136003.4 \, \text{J} \) (or more precisely, \( 24.6\times46179 = 1136003.4 \, \text{J} \)) ### 2. Is melting an endothermic or exothermic process?
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directions: write the formulas of the following ionic compounds based o…
1. $\text{AlPO}_3$ 2. $\text{K}_2\text{SO}_3$ 3. $\text{Al}_2(\text{CrO}_4)_3$ 4. $\text{LiNO}_3$ 5. $\text{Sr}(\text{ClO}_4)_2$ 6. $\text{Be}(\text{OH})_2$ 7. $\text{Ca}(\text{C}…
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choosing which 2 types of slide are those that cannot interlock one ano…
B. freezing and deposition
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ibra is analyzing the properties of several samples of elements to find…
B. has a high luster and is very brittle
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this is how manganese appears in the periodic table. what is the arrow …
chemical symbol of manganese
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15. thermal pollution is caused by excess ______. options: sewage inorg…
heat
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7. to be classified as organic, a chemical’s molecules must be ____. ba…
C. based on carbon
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8. storing toxic chemicals in metal drums is unwise because ______. ○ m…
○ the drums corrode
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7. the pollutants associated with eutrophication are ______. ○ nitrates…
nitrates and phosphates
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6. to be classified as organic, a chemical’s molecules must be ______ ○…
based on carbon
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3. mercury, lead, nickel, and chromium are all examples of ____. compou…
○ heavy metals
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water pollutants you have just learned about water pollutants. now matc…
1. heavy metal → a poisonous metallic element with a high mass number 2. toxic chemical → an element or molecule that is directly harmful to living things 3. eutrophication → the …
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guided practice which kind of environmental disturbance is commonly fou…
D. thermal pollution
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guided practice which is a synthetic organic material? a. acid b. lead …
D. plastic
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10. crude oil is a toxic chemical that is ____. a pathogen organic a he…
organic
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9. microorganisms that cause diseases are classified as ______. organic…
○ pathogens
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4. mercury is a pollutant classified as ______. a pathogen an organic m…
a heavy metal
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1 the major cause of water pollution by industries involves—— toxic che…
A. toxic chemicals
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you have just learned about water pollution. now match each term with i…
- sewage → water that contains organic wastes from humans and industry - surface water → the water that is above ground in streams, lakes, rivers, and ponds - pathogen → a parasit…
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fill in the information missing from this table: some electron shells s…
Shell 1: subshell \( 1s \) (so the missing row is shell 1 with subshell \( 1s \))
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here are sketches of four atomic electron orbitals: a b c d are any of …
- Are any of them s orbitals? $\boldsymbol{Yes}$ - List the s orbitals, if any: $\boldsymbol{C}$ - Are any of them p orbitals? $\boldsymbol{Yes}$ - List the p orbitals, if any: $\…
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a student was studying the ocean floor topography and began to question…
Feature F is a continental shelf, the shallowest part of the ocean floor, while Feature G is a deep ocean trench, the deepest part of the ocean, which has more pressure than the c…
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6. through incidents of cancer and birth defects were reported by peopl…
B. chemicals leaking above ground
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you have just learned about land pollution. now match each term with it…
- hazardous waste → solid, liquid, or gaseous wastes that are potentially harmful to humans and the environment, even in low concentrations - toxic wastes → hazardous wastes made …
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guided practice which is classified as a corrosive hazardous waste? a. …
D. lye
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1. sand and computer chips share which element as their basic component…
silicon
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sample response: salt is ionic, and oil is covalent. if you add water, …
- the idea that water will dissolve salt - the idea that water does not dissolve oil - the idea of using electricity to test
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a scientist recorded the amount of substance z present in an ongoing ch…
0.08 g
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by mistake, you added salt instead of sugar to the oil. how can you rem…
1. Add a small amount of water to the oil-salt mixture and stir gently. The salt will dissolve into the water. 2. Let the mixture sit undisturbed until it separates into two layer…
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have low melting and boiling points and be a poop conductor of electric…
☑️ be a liquid or gas ☑️ not be soluble in water ☑️ not conduct electricity
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if a substance is ionic, then it likely will conduct electricity when d…
☑️ be a crystalline solid ☐ be soluble in water ☐ conduct electricity
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8 choice multiple 2 points which of the following is the most likely re…
A. adding more bleach no longer increased the level of chlorine gas.
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a scientist recorded the amount of substance y present in an ongoing ch…
2.3 g
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6 elección múltiple 2 puntos each of the following is a by - product re…
B. $\ce{NaOCl}$
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the production of a certain plastic calls for a mixture of bleach and a…
C. Minimum of 1.00 mol NaOCl and maximum 1.00 mol NH₃ (assuming the options are labeled A, B, C, D with C being the selected one in the image)
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4 respuestas múltiples 2 puntos select the chemicals that have a covale…
A. \( \text{NH}_4\text{Cl} \) B. \( \text{NH}_3 \) D. \( \text{NCl}_3 \) E. \( \text{Cl}_2 \)
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biogeochemical cycles: the nitrogen cycle decide if each statement is t…
Verdict: FALSE. Explanation: Lightning helps fix atmospheric nitrogen (converts \(N_2\) to nitrogen oxides) which then enter the soil via rain, it does not add nitrogen to the atm…
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3 (choice couple 2 points) if a ninth trial were conducted in experimen…
C. \( 0.12 \, \text{mol} \) (assuming the option with \( 0.12 \, \text{mol} \) is labeled as option C, if the original labeling was different, adjust the label according to the or…
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in experiment 2, different quantities of naocl were added to the ammoni…
The amount of \( \text{NH}_3 \) available for reaction is limited, and once used up, the reaction stops
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summarize what you have studied if a substance is ionic, then it likely…
conduct electricity when dissolved in water (or melted), have a high melting point, and be brittle (the most common core property is: conduct electricity in aqueous solution or mo…
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another know by - product of the reaction of bleach and ammonia is nitr…
C. between the trials of 0.50 and 1.00 mol of NH3. G
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experiment 2 another know by - product of the reaction of bleach and am…
between the trials of 0.50 and 1.00 mol of NH3. G
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you have just learned about minerals. now match each term with its defi…
1. smelting → the process of heating and refining an ore to separate out the valuable minerals 2. ore → a rock or mineral that contains economically desirable metals or nonmetals …
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guided practice which is a characteristic of rocks or minerals that mak…
B. They contain metals or nonmetals.
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gunshot residues because all firearms explode gunpowder, they produce g…
From gunshot residue (GSR) examination, we can learn: (1) Whether a person fired a gun (as GSR could be found on their hands or clothing). (2) Even if GSR is attempted to be remov…
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1) sugarcane is an example of a plant that can be used to produce which…
ethanol
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15. which is not a major component of natural gas? propane hydrogen sul…
carbon monoxide
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13. ethane, with the chemical formula $c_2h_6$, is an example of ____. …
a hydrocarbon