化学
化学反应、化学计量、分子结构与元素性质。
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11. if you have 158.2 grams of table salt, how many molecules do you ha…
1.630 x 10^24 molecules ### Question 12
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9. how many moles of magnesium are in 3.01 x 10^22 atoms of magnesium? …
0.0500 mol ### Question 10
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people have used silver (ag) throughout history to make jewelry and sil…
silver sulfide (Ag₂S)
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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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why are there often holes in slices of bread? the holes are created by …
glucose ($\text{C}_6\text{H}_{12}\text{O}_6$)
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5. how many moles of oxygen atoms are present in 5.00 mol of diphosphor…
25.0 mol (Option: 25.0 mol) ### Question 6
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3. plants and animals depend on glucose as an energy source. calculate …
7.50 mol (the option with "7.50 mol") ### Question 4
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1. aluminum oxide, often called alumina, is the principal raw material …
2.50 mol (corresponding to the option "2.50 mol") ### Question 2
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name: ______ pd: ____ directions: for each of the following ionic compo…
To draw the Lewis structures for these ionic compounds, we follow these general steps for ionic compounds (composed of cations and anions): ### Step 1: Identify the ions For an io…
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which renewable resource, despite being made from organic matter, still…
D. Biomass
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5. fill in the ions | | | | atom symbol | number of electrons | number …
The filled table (key values) is as above. For each ion: - Be: \( \text{Be}^{2+} \) (protons = 4, electrons in ion = 2, charge = +2) - O: \( \text{O}^{2-} \) (protons = 8, electro…
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4. which of the following pairs of elements have the lower electronegat…
To determine which element in each pair has lower electronegativity, we use the **trends of electronegativity in the periodic table**: - Electronegativity generally **increases ac…
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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 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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which of the following formulas represent covalent compounds? check all…
$\ce{H_{2}SO_{4}}$, $\ce{C_{3}H_{8}}$, $\ce{CH_{5}N}$
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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 copper. ☐ alkali metal ☐ alkaline …
metal, transition metal
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check all of the terms that apply to silicon. □ alkali metal □ alkaline…
The terms that apply to silicon are: - main group element - metalloid - nonmetal (To mark the boxes: check "main group element", "metalloid", and "nonmetal")
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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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fix any errors with subject-verb agreement below. click \submit answer\…
The team of chemists **consists** of three women and two men, although Black Widow wants to hire more people.
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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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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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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 $\boldsymb…
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strawberry aldehyde (c₁₂h₁₄o₃) is a chemical that helps give strawberri…
ethyl chloroacetate ($C_4H_7ClO_2$) acetophenone ($C_8H_8O$)
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what are three industries that support production agriculture? what are…
1. Agricultural Machinery Industry (manufactures farm equipment like tractors, combines). 2. Fertilizer Industry (provides nutrients for crop growth). 3. Agricultural Chemical (Pe…
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if you visit a cave, you may notice icicle - shaped rocks called stalac…
- calcium carbonate ($\text{CaCO}_3$) - carbon dioxide ($\text{CO}_2$)
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11. if you have 158.2 grams of table salt, how many molecules do you ha…
1.630 x 10^24 molecules ### Question 12
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9. how many moles of magnesium are in 3.01 x 10^22 atoms of magnesium? …
0.0500 mol ### Question 10
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people have used silver (ag) throughout history to make jewelry and sil…
silver sulfide (Ag₂S)
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review ✓ all changes in matter are either physical or chemical. ✓ a phy…
The two categories of matter changing are physical change and chemical change.
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why are there often holes in slices of bread? the holes are created by …
glucose ($\text{C}_6\text{H}_{12}\text{O}_6$)
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5. how many moles of oxygen atoms are present in 5.00 mol of diphosphor…
25.0 mol (Option: 25.0 mol) ### Question 6
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3. plants and animals depend on glucose as an energy source. calculate …
7.50 mol (the option with "7.50 mol") ### Question 4
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1. aluminum oxide, often called alumina, is the principal raw material …
2.50 mol (corresponding to the option "2.50 mol") ### Question 2
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name: ______ pd: ____ directions: for each of the following ionic compo…
To draw the Lewis structures for these ionic compounds, we follow these general steps for ionic compounds (composed of cations and anions): ### Step 1: Identify the ions For an io…
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which renewable resource, despite being made from organic matter, still…
D. Biomass
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5. fill in the ions | | | | atom symbol | number of electrons | number …
The filled table (key values) is as above. For each ion: - Be: \( \text{Be}^{2+} \) (protons = 4, electrons in ion = 2, charge = +2) - O: \( \text{O}^{2-} \) (protons = 8, electro…
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4. which of the following pairs of elements have the lower electronegat…
To determine which element in each pair has lower electronegativity, we use the **trends of electronegativity in the periodic table**: - Electronegativity generally **increases ac…
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from nature, addresses, and lectures 1. the first in time and the first…
4. Man desires to find the interrelation of elements in nature.
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8. the most useful property of metalloids is their a. varying ability t…
a. Varying ability to conduct electric current ### Question 9
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final for semester 1 name online portion (____ / 93 pts) + paper portio…
### Part 1: Molar Mass Calculation #### For $\boldsymbol{Fe_2(SO_4)_3}$ - Atomic masses: $Fe = 55.85\ \text{g/mol}$, $S = 32.07\ \text{g/mol}$, $O = 16.00\ \text{g/mol}$ - Molar m…
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determine the percentage composition of hydrogen (h) in hcl find total …
The percentage composition of hydrogen (H) in HCl is approximately 2.76%.
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multiple choice question misty begins her conclusion by saying, \my pur…
D. She starts off with the phrase "my purpose today has been."
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antonio stradivari and other craftspeople in the sixteenth to eighteent…
I quality of Cremonese violins results in part from a method the craftspeople used to alter the wood
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tobacco teaser 1. cigarette smoking is the most? cause of death in amer…
1. L. preventable 2. I. nicotine 3. C. inhale 4. A. wrinkles 5. G. cigars 6. K. addicted 7. F. carbon monoxide 8. H. eighteen 9. N. lung cancer 10. D. tar 11. M. lungs 12. E. with…
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1. using the formula given below, determine whether the ions will attra…
### Table for Step1 (already provided, confirmed): | Variable | Charge | Equation Value | |----------|--------|----------------| | $q_1$ | $+3$ | $3$ | | $q_2$ | $-2$ | $2$ | ### …
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multiple choice question if your specific purpose is \to persuade my au…
C. a reason why listeners should only eat organic produce
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name: ice cream in a bag chemistry plays an important role in many ever…
1. An ion is an atom with a charge. 2. A phase change is when matter goes from one state to another as a result of an energy exchange. 3. When salt is added to ice, the salt disso…
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na₂co₃ + pb(no₃)₂ → pbco₃ + 2nano₃ 25.1 g of sodium carbonate reacts wi…
\( 63.3 \)
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directions: two beakers of water are heated on the same stove for exact…
Beaker A will have a higher temperature because the same amount of energy was added to a smaller mass.
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name: myles date: jan 13th block: 2nd 1. for each of the following, lab…
nonmetal #### b.