Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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what is the h⁺ in a solution that has a ph of 3.35? a. 1 × 10^3.35 m b.…
c. \(4.5\times 10^{-4}\space M\)
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a solution is an example of a (an)_____ a. pure substance b. element c.…
d. homogeneous mixture
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2.4 chemical reaction 6o₂ + c₆h₁₂o₆ 1. 2. 6co₂ + 6h₂o 3. bond energy: c…
1. Reactants 2. Reaction Arrow (→) 3. Products Bond energy: Energy required to break (or released when forming) a chemical bond. Chemical equilibrium: State where forward and reve…
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which of the following is not true? ○ increasing temperatures lead to f…
water molecules become more spaced out from one another once they have evaporated
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density calculations density is the ration of mass to volume within a s…
\( 2.70\space g/mL \) ### Problem 2
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2. *what property does distillation rely on to separate substances? a. …
C. Boiling point ### Question 4
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q1 chemistry: u1l4 mixture types part 3: multiple choice questions 1. *…
C. Filtration ### Question 3
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question 1 what is the most common ionic charge of an atom of astatine?…
-1 ### Question 2: Ionization energy order (K, Ca, Cl) Ionization energy generally increases across a period (left to right) and decreases down a group. Potassium (K) is in Period…
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2. for multipl... with the least amount of signi... (table with additio…
\( 28.32\ \text{cm} \) ### 2) \( 48.0032\ \text{g} + 9.17\ \text{g} + 65.4321\ \text{g} \)
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complete the following scientific calculations and make sure to keep tr…
\( 7.5 \, \text{in}^2 \) ### Problem 2: \( 1.543 \, \text{m} \times 4.32 \, \text{m} \)
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name ______ class ______ date ______ concept review continued 16. when …
A sample of matter is a pure substance when it consists of only one type of element or compound (has a fixed composition and distinct properties). ### Question 17
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name ______ class ______ date ______ skills worksheet concept review ma…
s to Element Symbol/Name Questions: 1. C: Carbon 2. S: Sulfur 3. N: Nitrogen 4. Au: Gold 5. Hg: Mercury 6. Sn: Tin 7. silver: Ag 8. lead: Pb 9. potassium: K 10. iron: Fe 11. sodiu…
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question 2 how many atoms are in al₂(so₄)₃? (note: corrected from poten…
17
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part b – balancing practice (show your work) balance the following equa…
$\boldsymbol{\ce{2H_2 + O_2 ightarrow 2H_2O}}$ ### 2. Balancing $\boldsymbol{\ce{Na + Cl_2 ightarrow NaCl}}$
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using the reactivity series below, explain why the element gold is used…
- **Claim:** Gold is used for monetary units because it is highly unreactive. - **Evidence:** Gold is at the bottom of the given reactivity series, showing the lowest reactivity a…
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does this diagram represent a chemical change? (be sure to answer in ce…
- **Claim:** The diagram represents a chemical change. - **Evidence:** The diagram shows a reactant molecule (smaller atom group) forming a different product molecule (larger, new…
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which of the following best describes why some elements are more chemic…
The option "Chemical reactivity depends on the arrangement of an atom's electrons. Different elements have different numbers of valence electrons." (the third option with the blue…
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which metal would you expect to lose its electrons more easily? reactiv…
B. Calcium
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reactivity series of metals lithium rubidium potassium barium calcium s…
Copper
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reactivity series of metals lithium rubidium potassium barium calcium s…
B. Calcium (assuming the options are labeled, but based on the list, Calcium is the most reactive among the given choices as it’s higher in the series than Aluminum, Copper, and N…
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question 1 which element is found the fifth period and the first group …
Rubidium (Rb) ### QUESTION 2
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3) choose the best answer. compounds and their elements cannot be broke…
their properties changing ### Question 4
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1) choose the best answer. a(n) ______ is a chemical combination of ato…
A. molecule ### Sub - Question 2
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5) choose the best answer. a ____ compound is made in a laboratory and …
B. synthetic ### Question 6
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blue and orange are type your answer... colors because they are across …
complementary ### Second Blank (Social Interaction/Communication):
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what is the best tool for securing the stake to a stem when extending a…
A. Floral stem tape ### Question 2 (Fill in the Blank):
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____ is an example of an organic compound. ○ sulfuric acid ○ hydrogen c…
D. Sugar ### Second Question (Multiple - choice)
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13 true or false 5 points to help the upper portion of the waterfall de…
True ### Question 14
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11) choose all that apply. which two elements are combined to create sa…
B. silicon, C. oxygen ### Question 12
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10) choose the best answer using the table. chemical compounds compound…
sugar
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question 8 of 10 which of these demands is most closely linked to an in…
B. Demand for cheap, processed food
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choose two facts about organic compounds. □ organic compounds are often…
- $\square$ Organic compounds are often associated with life. (checked) - $\square$ Organic compounds contain the element carbon. (checked) ### Part 2: What is the chemical formul…
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question 3 of 10 which of these choices is required by sustainable agri…
B. Low food miles
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question 1 of 10 how does planting high-yield crop varieties make farmi…
B. It decreases the amount of land needed
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4) element x has an electron configuration of 1s²2s²2p⁶3s¹, while eleme…
s: a) Fluorine (Z) b) Sodium (X) c) Fluorine (Z) d) Fluorine (Z) (anion \( \text{F}^- \))
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3) the first ionization energy for potassium, k, is 419 kj/mol and the …
The first ionization of \( \boldsymbol{\text{K}} \) removes an electron from a neutral atom (\( \text{K} ightarrow \text{K}^+ + e^- \)), while the second ionization of \( \boldsym…
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(c.6e) use the periodic table and your knowledge of atomic structure to…
To solve this, we match each element with its correct electron configuration using the periodic table and electron configuration rules (Aufbau principle, Pauli exclusion, Hund's r…
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(c.6b) many people believe that the atomic number of the atom is the nu…
When the atom is neutral and the number of electrons and the number of protons are equal.
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(c.6b) match each term and definition. this is a subatomic particle wit…
### First Term - "This is a subatomic particle with a negative charge and very little mass." - The correct term is "Electron" because electrons are subatomic particles that have a…
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(c.6b) match each term and definition. this is a subatomic particle wit…
Electron ### Second Term - "This is an atom that has lost or gained electrons."
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how does frost use irregular blank verse to affect the language of his …
B. Frost makes the language sound like everyday speech through irregular blank verse.
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what characteristics suggest that the second example is written in blan…
B. no rhyme, ten syllables to a line, and pairs of syllables in which the second syllable is stressed
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convert 6.7 μg to g. 6.7 μg → ??? g tap arrows to move the decimal poin…
\(6.7\times10^{-6}\ \text{g}\) (or \(0.0000067\ \text{g}\))
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nitrogen dioxide is a gas commonly found in polluted air. it is produce…
s: - Number of N atoms: \( \boldsymbol{4} \) - Number of O atoms: \( \boldsymbol{8} \) - Number of \( NO_2 \) molecules: \( \boldsymbol{4} \)
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consider the following reaction: some amount of hydrogen peroxide (h₂o₂…
s: - H atoms: 20 - O atoms: 20 - H₂O₂ molecules: 10
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this passage describes a chemical reaction. read the passage. then, ans…
lactic acid ($\ce{C_3H_6O_3}$)
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this passage describes a chemical reaction. read the passage. then, ans…
- ferric oxide ($\ce{Fe_{2}O_{3}}$) - aluminum (Al)
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this passage describes a chemical reaction. read the passage. then, ans…
B. water ($\ce{H_{2}O}$), D. sodium fluoride ($\ce{NaF}$)
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this passage describes a chemical reaction. read the passage. then, ans…
- silver (Ag) - hydrogen sulfide ($\ce{H_{2}S}$)
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this passage describes a chemical reaction. read the passage. then, ans…
The correct reactants are: - nitrogen (N₂) - hydrogen (H₂) (Note: Ammonia (NH₃) is a product, not a reactant, so it should not be selected.)
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this passage describes a chemical reaction. read the passage. then, ans…
B. acetic acid ($\ce{C2H4O2}$) D. aspirin ($\ce{C9H8O4}$)
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this passage describes a chemical reaction. read the passage. then, ans…
B. carbon dioxide ($\ce{CO_{2}}$), C. calcium carbonate ($\ce{CaCO_{3}}$)
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this passage describes a chemical reaction. read the passage. then, ans…
A. silica (SiO₂) B. hydrofluoric acid (HF)
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refer to passage 1 to answer this question. what does the author think …
D. He believes these plans have many mistakes. (Note: Assuming the options are labeled A - D as is common, with A: He respects and admires these plans, B: He thinks these plans ar…
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this passage describes a chemical reaction. read the passage. then, ans…
- lauryl alcohol ($\ce{C_{12}H_{26}O}$) - soda ash ($\ce{Na_2CO_3}$) - sulfur trioxide ($\ce{SO_3}$)
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this passage describes a chemical reaction. read the passage. then, ans…
B. sodium chloride ($\ce{NaCl}$) C. water ($\ce{H_{2}O}$) D. carbon dioxide ($\ce{CO_{2}}$)
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this passage describes a chemical reaction. read the passage. then, ans…
C. diphenyl oxalate ($\ce{C_{14}H_{10}O_4}$) D. hydrogen peroxide ($\ce{H_2O_2}$)
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this passage describes a chemical reaction. read the passage. then, ans…
The products are: - Isoamyl acetate ($\ce{C7H14O2}$) - Water ($\ce{H2O}$) (So, the correct checkboxes should be for "isoamyl acetate ($\ce{C7H14O2}$)" and "water ($\ce{H2O}$)"; th…
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this passage describes a chemical reaction. read the passage. then, ans…
DEET ($\ce{C_{12}H_{17}NO}$)
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this passage describes a chemical reaction. read the passage. then, ans…
Only the option "glucose ($\ce{C6H12O6}$)" is a reactant. So the correct selection is: glucose ($\ce{C6H12O6}$)
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this passage describes a chemical reaction. read the passage. then, fol…
product
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this passage describes a chemical reaction. read the passage. then, fol…
reactant
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this passage describes a chemical reaction. read the passage. then, fol…
reactant
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how many nitrogen atoms are there in 5 molecules of nh₃?
5
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how many fluorine atoms are there in 2 molecules of hf? hint: the symbo…
2
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how many silicon atoms are there in 3 molecules of sih₄? hint: the symb…
3
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b. now assume that six percent of the chemical is not used and disposed…
To solve this, we need the basic EOQ formula and the given data (which is missing here, but typically EOQ uses demand \( D \), ordering cost \( S \), and holding cost \( H \)). Le…
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how many bromine atoms are there in 4 molecules of ch₃br? hint: the sym…
4
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how many boron atoms are there in 2 molecules of bf₃? hint: the symbol …
2
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how many phosphorus atoms are there in 5 molecules of pcl₃? hint: the s…
5
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how many iodine atoms are there in 2 molecules of hi? hint: the symbol …
2
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how many sulfur atoms are there in 5 molecules of h₂s? hint: the symbol…
5
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how many carbon atoms are there in 4 molecules of c₃h₈?
12
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count the hydrogen atoms in this molecule. how many hydrogen atoms are …
6
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count the chlorine atoms in this molecule. hint: the symbol for chlorin…
3
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count the fluorine atoms in this molecule. hint: the symbol for fluorin…
1
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what do these two changes have in common? an iceberg melting slowly sno…
A. Both are changes of state.
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what do these two changes have in common? bleaching hair a log decompos…
A. Both conserve mass C. Both are chemical changes
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what do these two changes have in common? rain forming in a cloud cellu…
D. Both conserve mass.
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what do these two changes have in common? rust forming on a bicycle fra…
B. Both conserve mass D. Both are chemical changes (Note: The options are labeled as per typical multiple - choice labeling. If the original problem had different labels, adjust a…
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what do these two changes have in common? filtering air to remove dust …
D. Both are only physical changes
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what do these two changes have in common? using a large magnet to remov…
Both conserve mass.
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what do these two changes have in common? water evaporating from a pudd…
A. Both are only physical changes.
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what do these two changes have in common? acid rain weathering a marble…
B. Both are chemical changes.
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what do these two changes have in common? melting glass chicken cooking…
The correct option is: Both are caused by heating.
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how do soils form? ○ erosion transports mineral particles, and plants d…
Weathering breaks rocks into minerals, and plants die and decay ### Question 2: Which order of sediment size in these materials is correct from smaller to bigger particles?
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carbon atoms have four valence electrons. oxygen atoms have six valence…
To solve this, we analyze the valence electrons: - Carbon (C) has 4 valence electrons (needs 4 more for an octet of 8). - Oxygen (O) has 6 valence electrons (needs 2 more for an o…
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what do these two changes have in common? erosion caused by wind adding…
A. Both are only physical changes.
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oxygen (o), carbon (c), oxygen (o) with electron shell diagrams (blue n…
The molecule is Carbon Dioxide (\( \text{CO}_2 \))
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b. now assume that six percent of the chemical is not used and disposed…
To solve part (b), we need the basic EOQ formula and the given data (which we assume includes annual demand \( D \), ordering cost \( S \), and holding cost per unit \( H \), thou…
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self-check use this self-check to gauge your understanding. you can ret…
B. evaluate and compare data. (assuming the options are labeled A, B, C, D with A being "identify what she needs to know", B "evaluate and compare data", C "present on what she di…
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after the transfer of electrons, calcium becomes an ion with a charge o…
Calcium ion charge: $+2$; Oxygen ion charge: $-2$
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ionic and covalent bonding review a calcium atom has type here valence …
A calcium atom has \(\boldsymbol{2}\) valence electrons. It needs to transfer \(\boldsymbol{2}\) electrons to oxygen to have a full outer shell. An oxygen atom has \(\boldsymbol{6…
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problem 2-17 using curved arrows, show how the species in part (a) can …
### Part (a): Lewis Bases Reacting with HCl Lewis bases donate an electron pair. HCl is a Lewis acid (accepts electron pair, via \( \text{H}^+ \) or \( \text{Cl}^- \), but here \(…
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onding atoms can achieve a full outer shell of electrons either by tran…
The hydrogen molecule ($H_2$) forms a covalent bond by sharing electrons between the two hydrogen atoms.
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complete the model of a neon atom by dragging and dropping electrons on…
- First electron shell (innermost): Place 2 electrons. - Second electron shell (outer): Place 8 electrons.
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nding electrons in atoms neon (ne) in chemical reactions, atoms tend to…
Neon has 2 electrons in its first (inner) shell and 8 electrons in its second (outer) shell, with both shells full (first shell full at 2, second at 8).
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3. ionization energy is the energy required to remove an electron from …
### 3. IONIZATION ENERGY #### Trend across periods: **Step 1: Determine the trend direction** As you move from left to right across a period, ionization energy will *increase*. **…
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b. now assume that six percent of the chemical is not used and disposed…
To solve this, we likely need the basic EOQ formula and the holding cost details (which are missing here, but let's assume we have annual demand \( D \), ordering cost \( S \), an…
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2. ionic radius ion vs. neutral atom nonmetals gain electrons. this mea…
### 1. Pregunta sobre el radio iónico del sodio (opciones A - D) # Explicación: El ion de sodio ($\text{Na}^+$) se forma cuando el átomo de sodio ($\text{Na}$) pierde un electrón.…