化学
化学反应、化学计量、分子结构与元素性质。
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started jan 15 at 7:44am quiz instructions question 7 4 pts find the pa…
must have 0.5 grams or less of fat per serving If for "low fat":
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choose the complete ground - state electron configuration for neutral r…
[Kr] 5s1
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choose the complete ground - state electron configuration for the alumi…
B. 1s2 2s2 2p6 3s2 3p1
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use dimensional analysis for each problem. how many kilograms are equal…
B. $1.6 \times 10^{-2}\ \text{kg}$
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which of the following are potential hazards which you might encounter …
infectious microorganisms open flames hot surfaces corrosive chemicals sharp tools or broken glass
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al₂o₃ → al + o₂ cl₂ + nabr → nacl + br₂ h₂ + n₂ → nh₃ na + br₂ → nabr c…
Decomposition ### 2. $\ce{Cl_{2} + NaBr -> NaCl + Br_{2}}$
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part i. complete the table identifying the five reaction types (use the…
s for Part II: 1. $\text{P} + \text{O}_2 ightarrow \text{P}_4\text{O}_{10}$: Rxn Type: $\boldsymbol{\text{S (or C)}}$ (if we take synthesis: S, if combustion: C. But based on the …
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determining the combustion of methane gas conclusion initial mass: 1.00…
The reaction is mostly incomplete combustion.
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determining the formation of an iron chloride experimental data for rea…
4.54 g FeCl₂
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determining the decomposition of nahco₃ conclusion initial mass: 7.53 g…
The correct reaction is the one with the equation \( 2\text{NaHCO}_3(\text{s}) ightarrow \text{Na}_2\text{O}(\text{s}) + 2\text{CO}_2(\text{g}) + \text{H}_2\text{O}(\text{g}) \) (…
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determining the decomposition of nahco₃ experiment introduction alexand…
B. solid
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determining the formation of a tin nitride compound conclusion the expe…
Statement III
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determining the formation of a tin nitride compound experimental data f…
2.16 g Sn₃N₂ (corresponding to the option "2.16 g Sn₃N₂")
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determining the formation of a tin nitride compound experiment introduc…
\( \text{Sn}_3\text{N}_2 \) and \( \text{Sn}_3\text{N}_4 \) (the third option: "Sn₃N₂ and Sn₃N₄")
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determining the formation of a sulfur oxide conclusion initial mass: 5.…
\( \text{S}_5\text{N}_6 \) (the option with \( \text{S}_5\text{N}_6 \))
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part 2 use electron dot diagrams to show the ionic bonding in the follo…
### PART 2 (Ionic Bonding Formulas): 1. Barium oxide: $\text{BaO}$ 2. Calcium chloride: $\text{CaCl}_2$ 3. Aluminum oxide: $\text{Al}_2\text{O}_3$ 4. Sodium oxide: $\text{Na}_2\te…
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question #4 ethanol, a liquid at room temperature, is the intoxicating …
\( 2.42 \) (rounded to two decimal places, or more precisely \( 2.418 \)) \(\frac{\text{J}}{\text{g}^\circ\text{C}}\)
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the way we measure the amount of matter in a sample is by using a balan…
Primera línea en blanco: masa Segunda línea en blanco: constante (o "la misma")
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an element with mass 730 grams decays by 28.8% per minute. how much of …
22.0 grams
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question 10 of 10 what will occur when the following chemical reaction …
D. The concentration of \(H_2O\) will reach its maximum. (Wait, no—correction: The correct answer is C. Wait, no, re - checking: Wait, the correct analysis: In dynamic equilibrium…
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photosynthesis and cellular respiration $6\\ce{co_{2}} + 6\\ce{h_{2}o} …
B. Product
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determining the formation of an iron chloride experiment introduction d…
B. \( \text{Fe}^+ \)
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determining the formation of a tin nitride compound experiment introduc…
\( \text{Sn}_3\text{N}_2 \) and \( \text{Sn}_3\text{N}_4 \) (the third option: "Sn₃N₂ and Sn₃N₄")
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determining the formation of an iron chloride experiment introduction f…
A. FeCl
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most modern food production and distribution service exposes consumers …
d. All of the above
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value 3 which of the following have introduced the use of natural pest …
c. Crop cultivation ethics
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marco and his classmates are anxious about the upcoming chemistry test.…
- B. Politely refuse to cheat and start studying more. - C. Start a study group to prepare for the exam and build confidence. - E. Identify the act of cheating as wrong and too ri…
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soil permeability soil permeability is how quickly liquids can move ver…
A. It impacts irrigation and farming decisions.
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soil permeability leaching leaching can dissolve various substances lik…
C. nutrients, pesticides, and potentially harmful chemicals (assuming the options are labeled A, B, C with C being the third option as per the content)
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sample (nacl) | sample mass (g) | molar mass (g/mol) | number of moles …
The molar mass of NaCl is $\boldsymbol{58.4\ \text{g/mol}}$.
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reread the first six lines of the sonnet. if the first line is identifi…
- Thou art more lovely and more temperate: b - Rough winds do shake the darling buds of May: a - And summer's lease hath all too short a date: b - Sometime too hot the eye of heav…
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which steps will help you identify central ideas in a sonnet? check all…
- using context clues or a dictionary to define unfamiliar words - restating main ideas in my own words - finding a single idea or concept that links the big ideas in each quatrain
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read the first five lines of shakespeares \sonnet 12\ and use the drop …
Line 1: A Line 2: B Line 3: C Line 4: D Line 5: E Rhyme scheme: A B C D E
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sonnets which statements about sonnets are true? check all that apply. …
- The sonnet form was invented in Italy, and then adopted by English poets. - Sonnets are a kind of poetry. - The two types of sonnets are English (Shakespearean) and Italian (Pet…
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question 9 1 pts what step can a clinician take to learn more about any…
Question 9: Ask the woman to obtain her workplace MSDs (material safety data sheets). Question 10: D. A and C only Question 11: A hormonal intrauterine device (IUD) (or another lo…
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what is the main purpose of timing and sequencing explosions in firewor…
2. To entertain the audience
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question 2 what happens to the electrons in the atoms of chemical compo…
4. They become 'excited' and jump to higher energy levels
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4. you have been given a sample of aluminum measuring 30.00 cm by 10.00…
The number of particles (atoms) in the aluminum sample is approximately \( \boldsymbol{1.81 \times 10^{25}} \) (or more precisely, following significant figures, if we consider th…
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11. turbine moved by cyclist pedaling at medium speed with a fluorescen…
In this system, $\boldsymbol{\text{chemical}}$ energy from the cyclist is converted to a lot of $\boldsymbol{\text{kinetic (mechanical)}}$ energy and a little bit of $\boldsymbol{…
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fill in the missing chemical formulae in the tables below. acid\tconjug…
| acid | conjugate base | base | conjugate acid | |-------------|----------------|------------|----------------| | $\ce{H2PO4^-}$ | $\ce{HPO4^{2-}}$ | $\ce{SO4^{2-}}$ | $\ce{HSO4^…
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5) _ nabr + _ nabro₃ + _ h₂so₄ → _ br₂ + _ na₂so₄ + _ h₂o
5 $\ce{NaBr}$ + 1 $\ce{NaBrO3}$ + 3 $\ce{H2SO4}$ $ ightarrow$ 3 $\ce{Br2}$ + 3 $\ce{Na2SO4}$ + 3 $\ce{H2O}$ So coefficients: 5, 1, 3, 3, 3, 3.
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6) ____ kno₃ + ___ c₁₂h₂₂o₁₁ → ____ n₂ + ____ co₂ + ____ h₂o + ____ k₂c…
48 \( \text{KNO}_3 \) + 5 \( \text{C}_{12}\text{H}_{22}\text{O}_{11} \) → 24 \( \text{N}_2 \) + 36 \( \text{CO}_2 \) + 55 \( \text{H}_2\text{O} \) + 24 \( \text{K}_2\text{CO}_3 \)…
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a chemist carefully measures the amount of heat needed to raise the tem…
\( 1.9\space J\cdot g^{-1}\cdot K^{-1} \)
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a chemist prepares a solution of silver nitrate ($\\ce{agno_3}$) by mea…
\( 7.71 \)
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s₂o₂: disulfur dioxide part 3 of 3 nbr₃:
Nitrogen tribromide
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name each covalent compound. part 1 of 3 cf₄: part 2 of 3 s₂o₂:
carbon tetrafluoride ### Part 2: Naming \( \boldsymbol{S_2O_2} \)
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part 3 of 4 phosphorus trifluoride: part 4 of 4 sulfur trioxide:
s: Part 3: $PF_3$ Part 4: $SO_3$
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question attempt: 1 of 3 give the formula for each of the following com…
$CS_2$ ### Part 2 of 4: Dinitrogen Monoxide
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part 3 of 5 aluminum dihydrogen phosphate: part 4 of 5 rubidium sulfite:
s: Part 3: $\boldsymbol{\text{Al}(\text{H}_2\text{PO}_4)_3}$ Part 4: $\boldsymbol{\text{Rb}_2\text{SO}_3}$
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select the correct answer. read the sentence from paragraph 2 all the n…
B. struggle
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write a formula from each name. part 1 of 5 cuprous nitrate: part 2 of …
$\boldsymbol{CuNO_3}$ ### Part 2 of 5: Chromium(II) Nitrite
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part 2 of 4 be(oh)₂ rb₂so₃ rubidium sulfite
Beryllium Hydroxide
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give the correct name for the following compounds. part 1 of 4 rb₂so₃
rubidium sulfite
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be²⁺ and nitrite anion (no₂⁻).
The chemical formula of the compound formed by \( \text{Be}^{2+} \) and \( \text{NO}_2^- \) is \( \boldsymbol{\text{Be(NO}_2\text{)}_2} \)
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write the formulas for each of the ionic compound formed from the given…
\( \text{Li}_2\text{SO}_4 \)
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part 2 of 2 19 protons and 18 electrons:
The species with 19 protons and 18 electrons is the potassium ion (\(K^+\)) with a charge of \(+ 1\). The electron - proton count shows it is a cation (has more protons than elect…
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write the ion symbol for an atom with the given number of protons and e…
\(O^{2-}\)
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write the ion symbol for an atom with the given number of protons and e…
\(O^{2-}\)
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which of the following formulas represent covalent compounds? check all…
- $H_2SO_4$: Covalent compound (formed by non - metals with covalent bonds). - $C_3H_8$: Covalent compound (hydrocarbon, non - metal atoms bonded covalently). - $CH_5N$: Covalent …
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which of the following formulas represent covalent compounds? check all…
- $H_2SO_4$: Covalent compound (formed by non - metals with covalent bonds). - $C_3H_8$: Covalent compound (hydrocarbon, non - metal atoms bonded covalently). - $CH_5N$: Covalent …
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follow the links on the following page to read about the following canc…
### Completed Table: | TREATMENT TYPE | WHAT IS IT? | SIDE EFFECTS | |----------------------|-----------------------------------------------------------------------------|--------…
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check all of the terms that apply to silicon. alkali metal alkaline ear…
- main group element (checked) - metalloid (checked) - nonmetal: No (so not checked) Wait, no, the correct answer is that the terms applying to silicon are main group element, met…
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check all of the terms that apply to copper. ☐ alkali metal ☐ alkaline …
metal, transition metal
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check all of the terms that apply to silicon. alkali metal alkaline ear…
- main group element (checked) - metalloid (checked) - nonmetal: No (so not checked) Wait, no, the correct answer is that the terms applying to silicon are main group element, met…
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check all of the terms that apply to selenium. list of terms with check…
The terms that apply to selenium are: - nonmetal (check the checkbox for "nonmetal") - main group element (check the checkbox for "main group element") (Note: If there was a mista…
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part 4 of 4 a transition metal in period 4, group 12. a main group elem…
Magnesium (Mg) ### For "A transition metal in period 4, group 12"
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type the element’s name that fits each description. part 1 of 4 a main …
s: Part 1: Lithium (Wait, no, wait: period 2, group 1A: Lithium? Wait, no, Li is in period 2? Wait, yes, Li is in period 2. Wait, but I think I messed up. Wait, period 2: Li (Z=3)…
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part 2 of 2 125te protons: neutrons: electrons:
Protons: 52 Neutrons: 73 Electrons: 52
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give the number of protons, neutrons, and electrons in each isotope. pa…
Protons: 81 Neutrons: 122 Electrons: 81
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complete the following table for neutral elements. | | element symbol |…
| Element Symbol | Atomic Number | Mass Number | Number of Protons | Number of Neutrons | Number of Electrons | |----------------|---------------|-------------|-------------------…
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value: 25 match the description to the various ways in which the enviro…
a. 3. Hybrid cars b. 4. Organic farming c. 5. Natural pest control d. 2. Hydroponics e. 1. Xeriscaping
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question 20 (2.5 points) one gram is equivalent to how many micrograms?…
1,000,000 (the option with 1,000,000)
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which is the most commonly used measuring parameter for liquids in the …
C. Milliliter ### Question 2
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multiple-choice question what are the signs that a rotting fruit is goi…
A. change in color as mold grows C. a noticeable moldy smell
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which of the following are new substances of matter formed by the burni…
- ash (checked) - smoke (checked) - light (uncheck) - heat (uncheck)
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multiple-choice question what are indicators that a chemical change has…
- the glow from a candle - the smell of a rotten fruit
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6. write the dot diagrams for the following elements. na mg al p o f 7.…
### Question 6: Dot Diagrams (Lewis Dot Structures) for Elements Lewis dot diagrams show the valence electrons of an atom as dots around the element symbol. Valence electrons are …
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multiple-choice question what are examples of chemical changes (check a…
B. boiling an egg, C. explosions, D. burning wood
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atomic number 85 element name number of protons number of electrons
| Element name | Number of protons | Number of electrons | |--------------|-------------------|---------------------| | Astatine (At) | 85 | 85 |
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what is the name for the element represented by p? ○ phosphate ○ phosph…
C. Phosphorus (assuming the options are labeled A - D with A: Phosphate, B: Phosphorus, C: Phosphide, D: Potassium; but based on the given options, the correct one is the "Phospho…
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vaporization of rubbing alcohol: select physical change chemical change
physical change
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burning wood to heat up a grill: select chemical change physical change…
chemical change ### Sub - question 2: Dissolving sugar in water
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13 true or false 2 points for anyone under the age of 21, there is no a…
A. True ### Question 14
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homework: balancing chemical compounds name: pd: 9. al and s → 10. na a…
s: 9. $\boldsymbol{\text{Al}_2\text{S}_3}$ 10. $\boldsymbol{\text{Na}_2\text{O}}$ 11. $\boldsymbol{\text{CuI}_2}$ 12. $\boldsymbol{\text{Fe}_2\text{O}_3}$ 13. $\boldsymbol{\text{C…
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true or false 2 points children and pets are at risk for exposure to th…
True ### Question 4 (True or False)
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to help relieve pain during a dental visit, a dentist may give a patien…
In this chemical reaction, nitrous oxide is a product.
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1. how many grams of k₂cr₂o₇ can dissolve in 100 g of 50° water? 2. whi…
Approximately 25 grams (the value may vary slightly depending on the exact solubility curve, but around 25 g is typical). ### Question 2:
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people use different types of household products when they clean, but u…
- chlorine (Cl₂) - water (H₂O) - sodium chloride (NaCl)
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quiz: dangers of other tobacco products choose the best answer for each…
True ### Question 2
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6. one liter is equal to one thousand milliliters. how many milliliters…
C. 240
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some chemical factories use the chloralkali process to make substances …
sodium chloride (NaCl) water (H₂O)
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what refers to the attraction between different substances? a. adhesion…
a. Adhesion ### Second Question:
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this passage describes a chemical reaction. read the passage. then, fol…
product
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3 true or false 2 points for anyone under the age of 21, there is no ac…
True ### Question 4
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3c. draw a model to explain \how does the heat pack in incubator b keep…
### Energy Transfer Model Update: Draw an arrow labeled "heat energy" pointing from the **reaction system (heat pack)** to the **incubator system (sand + eggs)**. Write $\boldsymb…
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6. one liter is equal to one thousand milliliters. how many milliliters…
C. 240
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strawberry aldehyde (c₁₂h₁₄o₃) is a chemical that helps give strawberri…
ethyl chloroacetate ($C_4H_7ClO_2$) acetophenone ($C_8H_8O$)
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review ✓ all changes in matter are either physical or chemical. ✓ a phy…
We know matter has gone through a physical change when its **form (state, shape, size, etc.) changes, but its chemical identity (the substance itself) remains unchanged** (no new …
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what are three industries that support production agriculture? what are…
1. Agricultural Machinery Industry (manufactures farm equipment like tractors, combines). 2. Fertilizer Industry (provides nutrients for crop growth). 3. Agricultural Chemical (Pe…
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if you visit a cave, you may notice icicle - shaped rocks called stalac…
- calcium carbonate ($\text{CaCO}_3$) - carbon dioxide ($\text{CO}_2$)