化学
化学反応、化学量論、分子構造、元素の性質。
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i am a noble gas. you wont find a member in my family that is lighter t…
Helium (He)
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i am an alkaline earth metal. you will find me in the same period as th…
Barium (Ba)
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7. fill in the blank 1 point 7. type your answer... cucl₂ + type your a…
1, 1, 1, 2 (The coefficients in order for \(CuCl_2\), \(H_2S\), \(CuS\), \(HCl\))
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i am the halogen located in the second period of the periodic table. wh…
Fluorine (F)
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5 fill in the blank 1 point 5. type your answer... zn + type your answe…
The coefficients (from left to right) are 1, 2, 1, 1. So the blanks should be filled with 1, 2, 1, 1 respectively.
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i am an alkali metal located in the second period of the periodic table…
D. Lithium (Li)
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4 fill in the blank 1 point 4. type your answer... h₂o₂ → type your ans…
First blank: 2, Second blank: 1, Third blank: 2
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i am a noble gas. you wont find a member in my family that is lighter t…
Helium (He)
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3 fill in the blank 1 point 3. type your answer... n₂ + type your answe…
The balanced equation is \( \boldsymbol{1}\text{N}_2 + \boldsymbol{3}\text{H}_2 ightarrow \boldsymbol{2}\text{NH}_3 \), so the coefficients (from left to right) are 1, 3, and 2.
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term | information (definition, examples) | picture atom | | sodium ato…
- **Definition**: The smallest unit of a chemical element that retains the element’s properties, consisting of a nucleus (with protons and neutrons) and electrons orbiting the nuc…
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2 fill in the blank 1 point 2. type your answer... h₃po₄ + type your an…
First blank: 1 (coefficient of $\ce{H3PO4}$) Second blank: 3 (coefficient of $\ce{KOH}$) Third blank: 1 (coefficient of $\ce{K3PO4}$) Fourth blank: 3 (coefficient of $\ce{H2O}$) S…
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life requires about 25 chemical elements. matter is anything that takes…
Oxygen (O), Carbon (C), Hydrogen (H), Nitrogen (N) ### Sub - Question 2
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question 3 of 12 how did george washington carver use chemistry to help…
- He made other products, like soap and molasses, out of unwanted crops. - He tested the soil and found that Nitrogen needed to be added.
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part b the image models what happened after each cup was placed over an…
- **Water Level**: The water level in the bowl with red liquid (left) and the bowl with yellow liquid (right) may be similar or show a slight difference (e.g., left has a bit more…
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i) vsepr. draw the lewis structure for each of the following and determ…
1. $\text{CBr}_4$: Lewis structure: Central C with 4 single bonds to Br; each Br has 3 lone pairs. No resonance. VSEPR Geometry: Tetrahedral 2. $\text{H}_2\text{S}$: Lewis structu…
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when a formula unit of magnesium sulfide, mgs, is separated into magnes…
ions.
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when a formula unit of magnesium sulfide, mgs, is separated into magnes…
C. ions.
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36 am use the table, along with dimensional analysis, to convert the gi…
\(6000\)
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what is the correct electron dot formula for sodium chloride?\ \ \\(\\b…
$\boldsymbol{[Na]^+ \ [:\ddot{Cl}:]^-}$ (the second option)
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compounds can be classified as covalent or ionic by noting the location…
☑ sodium chloride ☑ potassium bromide ☑ magnesium chloride
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type the correct answer in the box. given: 8co + 17h₂ → c₈h₁₈ + 8h₂o in…
27.8
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select the correct answer. how many moles are contained in $3.131 \\tim…
A. 5.199 mol
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select the correct answer. what is the molar mass of babr₂? a. 217.2 g/…
B. 297.1 g/mol
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select the correct answer. how many particles are in one mole? a. $6.02…
A. $6.022 \times 10^{23}$
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1 type the correct answer in the box. sarah measures out 151 grams of s…
2.36
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given: 2libr + i₂ → 2lii + br₂ calculate the mass of bromine produced w…
239.7 grams
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10 multiple choice 1 point barium (ba) is in which group/ family? trans…
alkaline earth metals
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radon (rn) is in which group/ family? transition metals alkaline earth …
1. noble gases 2. halogens
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nickel (ni) is in which group/ family? alkaline earth metals noble gase…
1. Nickel (Ni): transition metals 2. Potassium (K): alkali metals
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determine if each element below is a metal, nonmetal, or metalloid. eac…
Xenon (Xe): Nonmetal Antimony (Sb): Metalloid Strontium (Sr): Metal
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13 multiple choice 1 point which of the following elements is a metallo…
B. germanium (Ge)
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1 mol sio₂ \\times \\frac{1 mol h₂o}{1 mol sio₂} = 30.0 g h₂o the total…
The total mass of the reactants is $\boldsymbol{140.0\ \text{g}}$ (from $60.0\ \text{g }\ce{SiO2} + 80.0\ \text{g }\ce{HF}$) The total mass of the products is $\boldsymbol{140.0\ …
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the chemical basis of life: atomic structure through chemical reactions…
To complete the table, we define the terms "Element" and "Compound" and provide examples: ### For "Element": - **Definition**: A pure substance consisting of only one type of atom…
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11 multiple choice 1 point alkali metals typically bond with which grou…
11. halogens 12. noble gases
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select the correct answer from each drop - down menu. read this sonnet,…
To solve this, we analyze the sonnet: ### 1. Sonnet Form Edmund Spenser’s sonnets follow the **Spenserian** form (a variant of the sonnet, with a unique rhyme scheme and structure…
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based on the information in the diagram, which conclusion is accurate?t…
A faster rate of physical weathering happens in dry climates
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85 rb 37 use the information for rubidium (rb) provided above. a neutra…
37 protons, 48 neutrons, and 37 electrons.
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6. draw an energy level diagram, as shown in question 5, for each ion. …
7. Metals and nonmetals 8. 1. Alkali metals have 1 valence electron; halogens have 7. 2. Alkali metals form +1 ions; halogens form -1 ions. 3. Alkali metals are soft solids; halog…
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quiz choose the correct answer for the question. when finished, select …
C) Easy to repair
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part e in a lab, strontium (sr) and oxygen (o₂) are combined to produce…
23.2
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how does a food pyramid help individuals eat a healthy diet? a. a food …
healthy diet and what percentage of the diet each group should make up. # Brief Explanations: Food pyramids are visual guides that outline core food groups for balanced eating, al…
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9. complete the following table to write the chemical formula for each …
| Name of compound | Cation | Anion | Chemical Formula | |---------------------------|-----------|-----------|------------------| | (a) copper(I) oxide | $\text{Cu}^+$ | $\text{O}…
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balance the chemical equation. based on the equation, how many grams of…
Balanced equation: $\boldsymbol{\text{Cl}_2 + 2\text{KBr} ightarrow 2\text{KCl} + \text{Br}_2}$ Mass calculation sequence: $\boldsymbol{11.0\ \text{g KBr}} \times \boldsymbol{\fra…
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7. complete the following table to find the charge on the cation in the…
| Compound | Charge on cation | |----------|------------------| | (a) $\text{Cu}_2\text{S}$ | +1 | | (b) $\text{Cr}_2\text{O}_3$ | +3 | | (c) $\text{PbO}_2$ | +4 | | (d) $\text{Ni…
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Question was provided via image upload.
1. Alkali metals have 1 valence electron, halogens have 7 valence electrons. 2. Alkali metals form +1 cations; halogens form -1 anions. 3. Alkali metals are soft, metallic solids …
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given: $2\\ce{c8h18} + 25\\ce{o2} \ ightarrow 16\\ce{co2} + 18\\ce{h2o}…
$84.00\ \text{g}\ \text{CO}_2 \times \frac{1\ \text{mol}\ \text{CO}_2}{44.009\ \text{g}\ \text{CO}_2} \times \frac{25\ \text{mol}\ \text{O}_2}{16\ \text{mol}\ \text{CO}_2} \times …
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21. substance which contains carbon (1 point) inorganic substance micro…
21. D. Organic Substance 22. C. Complete Protein 23. A. Complementary Protein 24. B. Carbohydrate
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13. nutrient levels set for nutrients which lack evidence to develop an…
13. B. AI (Adequate Intake) 14. C. Vitamin 15. D. Inorganic Substance 16. B. Nutrient Toxicity
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5. average daily nutrient intake level for half of the healthy individu…
5. EAR (Estimated Average Requirement) 6. Mineral 7. Non-Essential Nutrient 8. Essential Nutrient
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clues eins/sehr gut zwei/gut drei/befriedigend vier/ausreichend fünf/ma…
None of the options seem to accurately match the grade "D+". However, if we assume a mis - mapping of grades and consider "D+" as a relatively low grade, the closest (though still…
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use the periodic table to choose the element that matches each descript…
chlorine ### group IIA:
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a classmate ran the same lab. they obtained 1.28 g of water vapor (h₂o)…
74.41%
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in the lab, we found that we obtained 0.90 grams of water vapor (h₂o). …
52.32%
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c₆h₁₂o₆ (s) + 6 o₂ (g) → 6 co₂(g) + 6 h₂o (g) step 1) first lets find o…
To determine the mole ratios for the reaction \( \ce{C6H12O6 (s) + 6 O2 (g) -> 6 CO2(g) + 6 H2O (g)} \), we use the coefficients from the balanced equation. ### For the \( \ce{O2}…
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ws 5h, ionic compounds w/polyatomic ions common polyatomic ions name\tf…
### Part A: Naming Ionic Compounds with Polyatomic Ions #### a. $\ce{CaCO_{3}}$ ## Step1: Identify cation and polyatomic ion Cation: $\ce{Ca^{2+}}$ (calcium), Polyatomic ion: $\ce…
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what caused the color? the flame was pink/purple for the green bear jus…
metals
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what caused the color? the flame was for the green bear just like the r…
1. First dropdown: the same 2. Second dropdown: did not 3. Third dropdown: chemicals (or elements/ions) 4. Fourth dropdown: gummy bear 5. Fifth dropdown: ions (or elements/chemica…
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trial 1 trial 2 (from video) potassium chlorate before heating white po…
To fill in the "TRIAL 2 (from VIDEO)" column, we match the observations from Trial 1 with the provided options (assuming the video trial has similar or consistent results for thes…
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what did at least 20,000 women do during the civil war? a. headed to th…
1. b. Signed up as battlefield nurses 2. a. Establish the American Red Cross 3. c. Bromine 4. d. The portable camera had become widespread. 5. c. It became common to embalm bodies…
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multiple-choice question why are there no parentheses in this formula? …
Because there is only one carbonate, so it is not needed.
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multiple-choice true or false: ion charges are still shown in the chemi…
False
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part 4: explain direction: briefly explain why each element has a large…
Chlorine is to the right of Aluminum in the same period. Moving right across a period, effective nuclear charge increases (more protons, same electron shells), pulling electrons c…
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what is the correct formula for ammonium? ammonium: $\\ce{nh_{4}^{+}}$ …
A. ammonium: $\text{NH}_4^+$
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ng formulas for ternary compounds (with polyatomic lons) calcium nitrat…
B. Because he has two of everything inside the parentheses (assuming the second option is labeled B; adjust the label based on the actual question's option numbering, but the corr…
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2. what distinguishes a pure substance from a mixture? a. substances ar…
D. Mixtures can be separated physically, while compounds cannot.
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in the early 1800s. franz gall proposed his theory of phrenology, which…
A. bumps on the skull that could reveal a person's mental abilities and character traits.
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this is a picture is a representation of what ty bond and ion? this is …
Na
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bell work - metallic bonds this is a picture is a representation of wha…
This is a picture of a metallic bond and a cation (positive) ion.
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the attractive force of electrostatic attraction as the charge on the n…
increases
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data table: solubility of sulfite compounds 11. a student performed an …
Sulfite compounds are typically insoluble, but alkali metals are an exception to this.
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na melts at a lower temperature than mg because the melting point depen…
True
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10. if each of these bottles of carbonated water initially contained th…
Bottle 4
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passage ii glowing on an adventure as i pulled my camera out of my back…
16. J. me; she pointed 17. C. glowing," she said in a hushed, whispering voice. 18. F. NO CHANGE 19. D. in 20. J. be utterly dark. 21. A. I figured she had been to the caves befor…
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8. according to your solubility rules, which of the following salts has…
A. NaClO
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8. which visual aid would make the most sense to include in a quick sta…
an illustration of toothpaste being squeezed onto a toothbrush
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writing chemical formulae (i) 1) magnesium oxide 2) lithium bromide 3) …
1) $\text{MgO}$ 2) $\text{LiBr}$ 3) $\text{Ca}_3\text{N}_2$ 4) $\text{Al}_2\text{S}_3$ 5) $\text{KI}$ 6) $\text{SrCl}_2$ 7) $\text{Na}_2\text{S}$ 8) $\text{RaBr}_2$ 9) $\text{MgS}…
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3. bleach is a chemical used as a cleaning product and is commonly foun…
B. Base
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extract from an article about master perfumers by scott suyare gary mar…
(i) indifferent: Having no particular interest or sympathy; unconcerned/neutral (ii) repelled: Filled with disgust or aversion; repulsed (iii) morph: To change smoothly from one f…
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writing chemical formulae (ii) 1) iron(ii) chloride 2) copper(i) sulfid…
1. $\text{FeCl}_2$ 2. $\text{Cu}_2\text{S}$ 3. $\text{PbI}_4$ 4. $\text{SnF}_2$ 5. $\text{Hg}_2\text{Br}_2$ 6. $\text{SnO}$ 7. $\text{Cr}_2\text{O}_3$ 8. $\text{AuI}$ 9. $\text{Mn…
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in each row, select the molecule with the highlighted h atom that is mo…
s: Row 1: The first molecule (with $\ce{O^+ - H}$) Row 2: The second molecule (with $\ce{S - H}$) Row 3: The first molecule (with $\ce{S - H}$) Row 4: The second molecule (with $\…
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in each row, select the molecule with the highlighted h atom that is mo…
To determine the more acidic molecule in each row, we analyze based on the stability of the conjugate base (after losing \( \ce{H^+} \)) and electronegativity/atom size: ### Row 1…
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lab: ionic and covalent bonds warm-up active formulate a hypothesis the…
...high melting and boiling points, solubility in polar solvents like water, ability to conduct electricity when dissolved in water or melted, and a crystalline solid structure at…
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extract from an article about master perfumers by scott sylvare gary ma…
### (f)(i) 1. Firmenich claims that its scented products reach more than half the world's population every day. 2. The fragrance and flavour industry brings in an estimated $30 bi…
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extract from an article about master perfumers by scott sayare gary mar…
## (c)(i) To mask unwanted odors and create a pleasant, consistent atmosphere for passengers. ## (c)(ii) To stimulate customers' desire to purchase popcorn, increasing concession …
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Question was provided via image upload.
## (a)(i) He needed money, had no formal perfume background, but had a talent for remembering chemical odours. ## (a)(ii) His employer noticed his natural ability to remember chem…
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now that we know the \types of reactions\ it is important for us to als…
### First Equation: Balancing $\boldsymbol{KClO_3 ightarrow KCl + O_2}$ # Explanation: ## Step1: Balance Oxygen atoms On the right, $O_2$ has 2 O atoms, and on the left, $KClO_3$ …
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the two reactions that will take place are as follows. 1st) ( ce{kclo_3…
1st reaction: Decomposition 2nd reaction: Combustion
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matching 4 points match each database role to its scenario. steve is re…
- Steve: db_denydatareader - Mark: db_bckupoperator - Jessica: db_owner - Taylor: db_denydatawriter
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a writer is writing the content for the company website of a backpack m…
1. While shopping for a backpack for his young son, company founder Adam Chen noticed that all of the "boy" backpacks depicted robots, monsters, or vehicles—none of which interest…
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7. which of the following is the best way to determine the relative age…
D. Look at the position of the layer compared to other layers.
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categorization 4 points indicate if each of the given statements relate…
s: 1. It can be categorized into physical and logical schemas. → True 2. The physical schema defines the structure of the database. → False 3. It defines everything about the data…
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2. what type of fossils form when minerals replace the organic material…
C. petrified fossils
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matching 5 points match the vocabulary term to its correct definition. …
- Structured Query Language (SQL) : programming and query language common to many relational database management systems - Structured data : structured tables, allowing for the ea…
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which of these is not a fertilizer component symbolized by npk on a fer…
Krypton
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1. what advance in technology helped lead to trench warfare? a. the air…
D. the machine gun ### Question 2
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name: mad minute: vsepr shapes & angles directions: fill in the missing…
### First Row (Linear Molecule): ## Step1: Analyze the molecule diagram The first molecule diagram is a straight line with three atoms (two terminal, one central), so it's a linea…
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rodrigo is trying to complete a crossword puzzle, but hes stuck on a se…
Tonya, who's taking organic chemistry this semester ### Second Question (Drug Identification)
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name: _guina takemura_ per: _1_ date: _2/5/26_ \gram to mole\ stoichiom…
30.3 mol (or 30.25 if 4 sig figs, but 121 has 3, so 30.3) ### Problem 2:
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what state of matter is the element found at stp? * (1 point) solid liq…
If the element has 8 protons (oxygen), state is Gas. If 16 protons (sulfur), state is Solid. But likely, for the proton question, let's check the second part. ### Second Question …
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5 what is the atomic mass of the element? * 80 121 201 281
C. 201 (assuming the element is Mercury or similar with atomic mass around 201; note: the question lacks the element's name, but from common atomic masses, 201 is a valid option f…