Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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cer: periodic table & atomic structure. an unknown element is discovere…
Claim: The student's claim is valid. Evidence: The element with 20 protons is calcium. Elements in Group 2 have 2 outer - shell electrons, and calcium has an electron - configurat…
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which of the following elements has the following complete electron con…
1. B. Calcium 2. C. 1
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give the chemical symbol for each of the following elements. a. silver …
Chemical symbols: Ag, Al, Cd, Sb, Sn, As, Hg, V, F, Ca, Br, Bi Electron - transfer equations: a. Sr→Sr²⁺ + 2e⁻ b. Se+2e⁻→Se²⁻ c. Fe→Fe²⁺ + 2e⁻ d. P + 3e⁻→P³⁻ e. Br+e⁻→Br⁻ f. Au→Au…
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2. in each of the following statements, you are given a pair of element…
a. Different elements b. Isotopes e. Different elements
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9. given that when, in the reaction above, 100.0 g of pbcl2(s) is used …
$42.1785\ kJ$
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group #: 15 nitrogen group → color this family dark blue on the blank t…
For Nitrogen - Group: - Family Members: N (7), P (15), As (33), Sb (51), Bi (83), Mc (115) - Uses/Existences: Fertilizer production (N), essential for life and in matches (P), his…
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how many energy levels are shown in a bohr diagram for an atom of oxyge…
1. First question: 2 2. Second question: All electrons move in a circular orbit around the nucleus.
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activator. use these words to answer the questions below. protons, neut…
a. Changing the number of protons will change the name of the element. b. Changing the number of neutrons makes an atom stable or unstable and creates different isotopes. c. Chang…
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select the statement that accurately explains why an atom is left with …
1. There are more positively charged subatomic particles in the atom's nucleus than electrons in the atom. 2. 2 electrons in the first level, 8 electrons in the second level, 2 el…
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part ii. application questions 1. how many horizontal rows are there on…
1. 7 horizontal rows, 7 principal energy levels in use. 2. 18 columns in the periodic table, 8 "A" columns. 3. Varying number of elements per row (2, 8, 18, 32 for different perio…
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which of the following is a characteristic of the group 14 elements? * …
1. They have 4 valence electrons. 2. Those with the lowest energy.
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draw the orbital diagram for each of the foll oxygen energy
1s: $\uparrow\downarrow$ 2s: $\uparrow\downarrow$ 2p: $\uparrow\downarrow$ $\uparrow$ $\uparrow$
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the diagram shows the structural formula for starch. which of the follo…
# Explicación breve: Las polímeros son compuestos formados por la unión repetitiva de subunidades llamadas monómeros. La estructura de la amistos muestra una combinación repetitiv…
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5. given that when, in the reaction above, 2.000 g of ch4(g) is used in…
The value of $\Delta H$ for the reaction (per mole of $CH_4$) is approximately $- 40.86\ kJ/mol$
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multiple choice question what is fascia? the most superficial layer of …
the most superficial layer of connective tissue surrounding and separating muscles
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the correct symbol for the isotope of potassium with 22 neutrons is 15 …
Question 3: $\ce{^{41}_{19}K}$ Question 4: protons Question 5: the number of protons plus neutrons
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5. given that when, in the reaction above, 2.000 g of ch4(g) is used in…
$5090.82\ J$
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consider a neutral atom with 30 protons and 34 neutrons. the mass numbe…
Question 1: 64. Question 2: $^{41}_{19}X$ and $^{39}_{19}X$ are isotopes of each other.
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2. given that when, in the reaction above, 1.000 g of c2h4(g) is used i…
$3046.75\ J/g$
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which statements about this area are true based on what you know about …
The area was once a forest. The area was uplifted. The area was probably covered by water. The area was covered by volcanic material.
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multiple choice 2 points the atomic number of an element is the number …
protons
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chapter 15 use vocabulary complete each sentence with the correct term …
14. Compounds 15. Suspension 16. Physical changes 17. Elements 18. Distillation 19. B. physical 20. B. burning 21. B. compound 22. D. the Tyndall effect 23. A. chemical change 24.…
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15 multiple choice 2 points electrons have a charge that is _. positive…
### Pregunta 15 # Breve Explicación: Los electrones son partículas subatómicas con una carga eléctrica negativa. # Respuesta: negativa ### Pregunta 16 # Breve Explicación: AMU es …
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16 multiple choice 2 points what does amu stand for. atomic mass unit a…
1. ¿Qué significa AMU? Respuesta: Unidad de masa atómica 2. ¿Cuál es la carga de los electrones? Respuesta: negativa
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which process is an example of chemical weathering? ○ iron in rocks rus…
Iron in rocks rusting when exposed to oxygen
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multiple choice 3 points 11 daltons theory did not include which of the…
11. Most of an atom's mass is in its nucleus. 12. subatomic particles
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show what you know: name that element! directions: use the article ame …
1. A. francium (Fr) 2. D. vanadium (V) 3. C. 26 4. D. tin (Sn) 5. B. bromine (Br)
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element name sulfur element symbol _ questions 13 atomic number: # of p…
Element Symbol: S Atomic Number: # of Protons = 16, # of Electrons = 16 Atomic Mass (actual weight): 32.066 u (rounded weight 32 u) # of Neutrons = 32 - 16 = 16 Is your element a …
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multiple choice 3 points how are electrons described in the electron cl…
the most likely locations of the electron is shown as a fuzzy orbital
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in stoichiometry, the coefficients in a balanced equation represent the…
moles
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credited with the first concept of a smallest piece of matter. john dal…
# Breve explicación: Demócrito fue el primero en concebir la idea de un átomo como la pieza más pequeña de la materia. John Dalton es conocido por la primera teoría atómica modern…
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pre - lab questions answer these questions before arriving for lab. sho…
1. Molar mass of $NO_3^-$: 62 g/mol; Molar mass of $PO_4^{3 -}$: 95 g/mol 2. Molar concentration of $NO_3^-$: $8.74\times10^{-5}$ mol/L 3. Concentration of $PO_4^{3 -}$ in ppm: 71…
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a thought on the inestimable blessing of reason by mercy otis warren. w…
There are two stanzas with the rhyme scheme ABCB throughout.
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unit 2 study guide topics covered: atomic history: atomic models atomic…
| | Mass | Charge | Location | |---|---|---|---| | Protons | 1 amu | +1 | Nucleus | | Neutrons | 1 amu | 0 | Nucleus | | Electrons | $\frac{1}{1836}$ amu | - 1 | Outside nucleus |…
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1. atomic theory (fill in the blank) give name of scientist and name of…
1. John Dalton, solid - sphere model 2. J. J. Thomson, plum - pudding model 3. Ernest Rutherford, nuclear model 4. Ernest Rutherford (protons), James Chadwick (neutrons), Bohr mod…
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atomic theory (fill in the blanks) give name of scientist and name of m…
The correct calculation to find the average atomic mass of chlorine is $(35\times0.75)+(37\times0.25)$.
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topics covered: atomic history: atomic models atomic structure: protons…
| | Mass | Charge | Location | |---|---|---|---| | Protons | 1 amu | +1 | Nucleus | | Neutrons | 1 amu | 0 | Nucleus | | Electrons | ~0 amu | - 1 | Electron - cloud | | Name | Sym…
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1. covalent compounds are also called: molecular compounds 2. covalent …
1. molecular compounds 2. shared; nonmetal + nonmetals 3. metal + metal 4. transferred; metal + nonmetal
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5. complete the properties associated with a covalent bond. a. melting …
a. low b. it depends (polar covalent compounds can be soluble, non - polar ones are not) c. no 6. true molecules
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which property of water allows it to absorb large amounts of heat energ…
A. water's high specific heat
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jodie has an unknown substance in a cup. she placed a thermometer in th…
D. Heat was somehow removed from the substance.
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which element has physical and chemical properties similar to aluminum …
D. Boron (B)
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substances at different temperatures which conclusion fits the data in …
C. Matter may change shape when it is heated.
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12. write the name or chemical formula for the molecular compounds belo…
$SO_3$: sulfur trioxide $P_2O_5$: diphosphorus pentoxide $N_2O_3$: dinitrogen trioxide $PBr_3$: phosphorus tribromide $S_4N_4$: tetrasulfur tetranitride $CS_2$: carbon disulfide $…
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question 8 of 21 which statement accurately describes the composition o…
An atom has a central nucleus that contains protons and neutrons with the electrons orbiting the nucleus.
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10. identify the number of electrons that are being shared below :cl - …
2 4 6
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answer the questions and find the letter in the column for that row. de…
r e g c e b e g i g r
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what determines a minerals unique characteristics? color and temperatur…
D. Chemical composition and crystal structure
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multiple choice 1 point identify the type of reaction (note the equatio…
double replacement
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5 multiple choice 1 point identify the type of reaction (note the equat…
A. decomposition
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4 multiple choice 1 point identify the type of reaction (note the equat…
C. single replacement
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3 fill in the blank 1 point balance the reaction shown below by typing …
1, 2, 1, 2
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2 fill in the blank 1 point balance the reaction shown below by selecti…
2, 4, 3
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exit ticket: balancing and rxn types 1 fill in the blank 1 point balanc…
1, 2, 2, 1
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melissas physical science teacher provides her with four substances lab…
C. Substance A
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based on this information, which one of the following elements has phys…
Potassium (K)
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read the passage and use it to determine the meaning of the terms. not …
1. E. The energy an object possesses due to its motion 2. L. The action of an object changing its position 3. M. The basic unit of a chemical element 4. D. The energy transferred …
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3. calculate the average atomic mass
$207.22$
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read the passage that is missing some key terms. find the term for each…
1. work 2. kinetic energy 3. component 4. within 5. ride a bike 6. force 7. tiniest 8. matter 9. destroyed 10. conservation 11. forms
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which of the following lewis diagrams could represent a neutral atom fr…
D.
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what type of weathering is the observation below? (one word, no spaces)…
1. physical 2. physical 3. chemical
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complete the paragraph using words from the word bank. word bank: appea…
Changes; chemical; appearance; cutting; transforms; vinegar; physical; original
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highlight the verb(s). the chemist scatters confetti on nemos table.
scatters
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part 2: determine the products formed by each of the following pairs of…
# Explanation: ## Step1: Determine ion charges For metal - non - metal pairs, metals lose electrons to form cations and non - metals gain electrons to form anions. For example, Be…
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327 chemistry prep b unit 2 ch 4 test name: i affirm that i did not giv…
| Isotope Name notation | Protons | Neutrons | Electrons | Mass number | Atomic number | Isotopic Symbol notation (AZ Notation) | |---|---|---|---|---|---|---| | Molybdenum - 99 |…
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part 2: determine the products formed by each of the following pairs of…
| # | Pair of Elements | Charges | Ionic Formula of the Compound Formed | Name of Compound | |---|---|---|---|---| | 1 | Be, F | $Be^{2+}, F^{-}$ | $BeF_{2}$ | Beryllium fluoride …
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part 2: determine the products formed by each of the following pairs of…
| # | Pair of Elements | Charges | Ionic Formula of the Compound Formed | Name of Compound | |---|---|---|---|---| | 1 | Be, F | Be$^{2 +}$, F$^{-}$ | BeF$_{2}$ | Beryllium fluori…
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isotope name (symbol) protons neutrons electrons mass number atomic num…
## Part II 1. Iron - 57 2. 26 3. 26 4. 57 5. 31 ## Part III 108.1 amu
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the question has two parts. read the passage. then answer part a. the e…
1. The author starts in the middle of an exciting event.
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the octet rule states that a full valence shell must contain eight elec…
True
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an ionic bond exists when one atom received an electron from another. t…
False
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why are noble gases the most stable elements? they have full valence sh…
They have full valence shells.
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directions: answer the following questions on the lines provided. 1. ho…
1. Usually the first one - or two - letters of the element's English or Latin name. 2. Protons, neutrons, and electrons. 3. No, quarks are smaller. 4. Six types; up - quark (for e…
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ws 1: ionic bonding for each pair of elements below, draw lewis dot str…
| Reactions | Atoms | Valence Electrons | Loses/Gains how many | Ions formed | | --- | --- | --- | --- | --- | | 1) Li + Cl | Li, Cl | 1, 7 | Li loses 1, Cl gains 1 | Li⁺, Cl⁻ | |…
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boron can only form covalent compounds with ______ electrons. two six f…
B. six
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subatomic particles: reviewing the main ideas complete the following ch…
| Particle | Location | Mass (amu) | Charge | | ---- | ---- | ---- | ---- | | Proton | nucleus | 1.007276 | +1 | | Electron | outside nucleus | 0.000549 | - 1 | | Neutron | nucleu…
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hot - air balloons are based on a single concept: warm air rises and co…
1. find
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327 chemistry prep b unit 2 test - chapter 4 directions: for the first …
1. a. same number of protons 2. c. mass number 3. a. atom 4. c. Dalton 5. c. electrons 6. b. Protons 7. A. True 8. b. indivisible 9. c. 0 10. b. Chlorine - 35 11. A. True 12. a. 2…
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question 2: consider the element chlorine (cl) from the periodic table.…
Part A: The average atomic mass of chlorine is approximately 35.45 amu. Part B: The average atomic mass of an element is not a whole number because elements are composed of a mixt…
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question 1. the atomic masses and the natural abundances of the two nat…
\((0.925)(7.02\ amu)+(0.075)(6.02\ amu)\)
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gloves are made from a synthetic rubber and provide protection from a v…
B. Neoprene
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from return of the native the scene was strangely homogeneous, in that …
4. No, because the figure remains inseparable from the structure as a whole until she moves, implying that the word means "motionlessness."
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combinations of atoms 1. there are just over 100 elements that make up …
1. Compound; Chemical bonds 2. Mixture 3. Physical; Chemical 4. Physical; Density; Sink 5. Three; Solid; Ice; Liquid; Water; Gas; Air; Plasma; Stars; Temperature
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8. an engine is 35% efficient. if it takes in 7,000 j of chemical energ…
$2450\ J$
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directions: answer the following questions on the lines provided. 1. ho…
1. Usually the first one - or two - letters of its English or Latin name. 2. A nucleus containing protons and neutrons, and an electron - cloud of electrons surrounding the nucleu…
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what is this used for? * 1 point choose mixing chemicals containing and…
Containing and observing reactions
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what is this? * 1 point choose bunsen burner erlenmeyer flask crucible …
Bunsen Burner
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what does this do? * 1 point choose holds things during an experiment h…
Holds things during an experiment
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think questions for close reading think 1 question how do mrs. caine an…
No answer can be provided without access to the relevant text to analyze the actions and justifications of Mrs. Caine and the police.
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major and related theories of cognition ch5:q2 jean piaget theorized th…
- Ch5:Q2: Assimilation is incorporating new information into existing cognitive schemas without altering the schemas. - Ch5:Q3: Sensorimotor stage (birth - 2 years), Pre - operati…
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question 2. if z is the symbol for an element, which pair among the fol…
51 Z and 51 Z with mass numbers 25 and 26 respectively (assuming this is one of the options as the text formatting is a bit unclear from the image but the logic is based on same -…
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question 2. if z is the symbol for an element, which pair among the fol…
$\ce{^{51}_{25}Z}$ and $\ce{^{50}_{25}Z}$
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match each scientist to their discovery regarding the atom. atoms have …
Dalton - Atoms are indivisible. Thomson - Atoms contain electrons. Millikan - Electrons have a charge of -1. Rutherford - Atoms have a positive nucleus.
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which statement best supports rutherfords idea that an atoms positive c…
Alpha particles passing through a thin sheet of gold foil are scattered in all directions.
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determine whether the following equation is balanced- 2 h2 + o2 → 2 h2o…
The equation is balanced.
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determine whether the following equation is balanced- 2 nabr + caf₂ → 2…
The equation is balanced.
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question 6 2 pts what is the acid - base reaction that happens in our p…
A. baking soda and butter milk
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determine whether the following equation is balanced- k + mgbr → kbr + …
The equation is not balanced because there are more magnesium atoms in the products than the reactants.
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determine whether the following equation is balanced- 8 s₈ + 15 o₂ → 8 …
The equation is not balanced because there are more oxygen atoms in the reactants than the products. (The first option is correct among the given ones as it correctly points out t…
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determine whether the following equation is balanced- 2 ag₂o → 4 ag + 1…
The equation is balanced.