Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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question 5 of 9 what is the primary purpose of an emergency eyewash sta…
To flush chemicals out of a person's eyes.
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how many electrons are transferred in the compound mgf₂ 8 16 1 2
D. 2
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4 multiple choice 1 point what is the correct formula for a compound co…
D. $MgSO_{4}$
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what is a fundamental rule regarding food and beverages in a laboratory…
They should not be consumed or stored in areas where chemicals are handled.
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what is the correct name for the following compound: (nh4)3po4 ammonium…
D. Ammonium Phosphate
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question 2 of 9 which of the following is generally recommended for foo…
Closed-toe shoes that cover the entire foot.
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2 multiple choice 1 point what is the correct name for the following co…
A. Barium Bromide
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the electron configuration for a fluorine ion is... 1s²2s²2p⁶ 1s²2s²2p⁵…
$1s^{2}2s^{2}2p^{6}$
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10 multiple choice 1 point how can land pollution harm the environment?…
B. All of the above
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reactivity quick check which elements would react most easily with each…
an element with a high electronegativity and an element with a single valence electron
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20. atoms are the smallest unit of matter that retain chemical properti…
True
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19. compounds are made of two or more different elements. true false cl…
True
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which element listed would have the greatest electronegativity? (1 poin…
Bromine
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how are reactivity and electronegativity related? (1 point) elements wi…
An element will be more reactive if it has a very high or very low electronegativity
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reactivity quick check which elements on the periodic table are the lea…
the group with helium at the top
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10. a substance made of only one type of atom is a: element compound mi…
A. Element
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9. which of the following is a chemical change? burning wood melting ic…
Burning wood
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reactivity quick check which element would have the lowest electronegat…
an element with a small number of valence electrons and a large atomic radius
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8. the law of conservation of matter states: matter can be created matt…
Matter cannot be creating or destroyed
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6. solar energy is an example of potential energy chemical energy elect…
C. Electromagnetic radiation
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part i. matching: match the choices to the statements. use each choice …
1. B. Atomic Number 2. T. Synthetic 3. Q. Radioactive 4. I. Mendeleyev 5. P. Proton 6. C. Atoms 7. F. Element Family 8. N. Period 9. H. Liquid 10. E. Elements 11. L. Mixture 12. G…
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1. which of the following is an example of a compound? oxygen (o) gold …
C. Water (H₂O)
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6) a gas has a density of 1.23 g/l. what would be the density of the ga…
1230 μg/mL
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return all unused chemicals to their original containers. false true
A. False
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2.3 identify each of the following as either an atom, element, molecule…
a. Compound b. Element c. Atom d. Element e. Molecule
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match the description to the appropriate chemical family. alkali metals…
1. transition metals - makes up the d - block of the Periodic Table, these are used as catalysts for chemical reactions 2. alkali metals - most reactive of all metals, chemical re…
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lab safety when you perform an experiment at home or school, your first…
1. wash 2. directions 3. organized 4. safety equipment 5. safety goggles 6. eat or drink 7. spill 8. flame 9. long hair 10. sharp 11. well - lit 12. unclosed 13. heat - resistant …
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1. **explain the difference between heterogenous and homogeneous mixtur…
1. Homogeneous mixtures look uniform macroscopically; heterogeneous mixtures have visible different parts. 2. Homogeneous mixtures have evenly - distributed particles at the nanos…
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valence electrons interact with the outermost electrons of other atoms …
the outermost electrons of other atoms
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when you perform an experiment at home or school, your first priority s…
1. wash 2. directions 3. organized 4. safety equipment 5. safety goggles 6. eat or drink 7. spill 8. flame 9. long hair 10. sharp 11. well - lit 12. unapproved 13. heat - resistan…
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what are valence electrons? the electrons in the electron cloud the ele…
the electrons in the energy level furthest from the nucleus
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the noble gasses are very unreactive are likely to spontaneously catch …
Son muy inreactivos.
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elements in group 17 are called the halogens. these elements - react wi…
reaccionan con metales para formar sales
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elements within the same family share similar: facial features physical…
# Breve explicación: En la tabla periódica, los elementos de la misma familia tienen propiedades físicas y químicas similares. # Respuesta: physical and chemical properties
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part 3: match each diagram with its correct description. diagrams will …
| Column A | Column B | Column C | |--|--|--| | 1. Summer Sausage | HM | Texture, Color | | 2. Steam | C | Density, Boiling Point | | 3. Salt Water | S | Conductivity, Density | |…
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multiple - choice question the periodic table is organized into 18 diff…
groups or families
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who was credited with developing the first periodic table and in what y…
Dmitri Mendeleev en 1869
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managerial work in finance and insurance use the information below to a…
chemistry and artistic skills
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e - cigs can have the same cancer causing chemicals as cigarettes.
RIGHT
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vape smoke could expose you and your pets to toxic chemicals like forma…
RIGHT
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when you perform an experiment at home or school, your first priority s…
1. wash 2. directions 3. organized 4. safety equipment 5. safety goggles 6. taste 7. spill 8. flame 9. long hair 10. sharp 11. well - ventilated 12. broken glass 13. heat - resist…
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which period or style of greek sculpture represents the greeks first at…
- Question 1: C. Archaic - Question 2: False - Question 3: False
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multiple choice 1 point what particle(s) is/are found outside the nucle…
D. Electrons
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what images are those in which the object or scene is not easily identi…
1. D. Abstract 2. False 3. Nephrite
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what images are those in which the object or scene is not easily identi…
- First question: D. Abstract - Second question: False - Third question: Nephrite
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wu: history of the atom multiple answer 1 point which of daltons postul…
C. All atoms of an element are identical, having the same size, mass, and chemical properties. D. Atoms cannot be created, divided into smaller particles, or destroyed.
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select the independent clause. frozen foods may lose water molecules an…
Frozen foods may lose water molecules and become dehydrated
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column a lists a substance. in column b, list whether the substance is …
| Column A | Column B | Column C | |--|--|--| | 1. Summer Sausage | HM | texture, color | | 2. Steam | S | temperature, pressure | | 3. Salt Water | S | density, boiling - point |…
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which major branch of chemistry would be most concerned with studying t…
A. organic
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part 3: match each diagram with its correct description. diagrams will …
1. C 2. E 3. B 4. A 5. D
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homeworks learning cycle 1 pre - assessment puntos posibles: 2.67 fill …
Chemical; Light; Sound; Heat
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fireworks learning cycle 1 pre - assessment puntos posibles: 1.33 carbo…
6 protons, 6 electrons, 6 neutrons
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fireworks learning cycle 1 pre - assessment puntos posibles: 0.57 what …
the number of outermost electrons
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part 2: classify each of the following as elements (e), compounds (c) o…
Diamond (C): E Air: M Krypton (K): E Water (H₂O): C Ammonia (NH₃): C Wood: M Dry Ice (CO₂): C Sugar (C₆H₁₂O₆): C Sulfuric Acid (H₂SO₄): C Bismuth (Bi): E Alcohol (CH₃OH): C Salt (…
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fireworks learning cycle 1 pre - assessment match each subatomic partic…
protons - positive neutrons - neutral electrons - negative
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question 8 of 10 what was the plum - pudding atomic model? a. a descrip…
B. A description of electrons scattered inside the atom
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under certain conditions, the substance water can be broken down to for…
27 grams
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question 7 of 10 which of the following ideas did john dalton teach? a.…
A. That matter was made of indivisible particles
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under certain conditions, zinc oxide and water combine to form zinc hyd…
37.1307 grams
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question 5 of 10 what was one main point of daltons atomic theory? a. t…
D. That atoms made up the smallest form of matter
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in the following equation for a chemical reaction, the notation (s), (l…
$O_2(g)$: reactant $SO_2(g)$: reactant $SO_3(g)$: product When the reaction takes place, energy is released.
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in the following equation for a chemical reaction, the notation (s), (l…
$CO(g)$: reactant $H_2(g)$: reactant $CH_4(g)$: product $H_2O(g)$: product The reaction is exothermic, so energy is released.
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in the following equation for a chemical reaction, the notation (s), (l…
$CO(g)$: Reactant $H_2(g)$: Reactant $CH_4(g)$: Product $H_2O(g)$: Product The reaction is exothermic (energy is a product).
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which of the following is false? two objects, both having positive char…
Electrostatic forces are responsible for the energy absorbed or released in chemical changes.
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1 the atom shown in the diagram has four energy levels or shells false …
1. False 2. False 3. False 4. True 5. True 6. False 7. True 8. True 9. True 10. False
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classify each of the following pure substances as either an element or …
Nickel: Element Copper: Element Silicon dioxide: Compound
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2. find the mass of a sample of mercury (d = 13.5 g/ml) if the volume i…
134301 g
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classify each of the following particulate level illustrations as a rep…
Top image: Compound Middle image: Element Bottom image: Compound
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a mixture of sand and isopropyl alcohol could most easily be separated …
filtration
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indicate whether each statement about atomic energy levels is true or f…
1. False 2. False 3. False 4. True 5. True 6. False
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classify each of the following mixtures as either homogeneous or hetero…
Apple juice: Homogeneous Pure air: Homogeneous Concrete: Heterogeneous
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question 10 of 10 which kind of force is a dipole - dipole force? a. in…
A. Intermolecular attraction
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classify each of the following particulate level illustrations as a rep…
Top image: Mixture Middle image: Mixture Bottom image: Pure substance
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question 9 of 10 which of the following is a result of intermolecular f…
B. Hydrogen bonds
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question 8 of 10 what does a nonpolar covalent bond show about the elec…
B. The difference in electronegativities of the two atoms is very small.
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in the illustration, o is color - coded as red. is the change represent…
Physical change
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question 7 of 10 how does molecular shape affect polarity? a. if the mo…
B. If the molecule is symmetrical, the effects of polarity will cancel out.
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question 6 of 10 which of these molecules is nonpolar? a. o₂ b. co c. c…
A. $O_2$
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classify each of the following changes as chemical or physical: rusting…
Rusting of iron: Chemical Souring of milk: Chemical Stretching a rubber band: Physical
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sprinters set in the starting blocks at the beginning of a race rely on…
D. Chemical potential energy converting to kinetic energy
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question 5 of 10 which kind of covalent bond has unequal sharing of ele…
D. A polar covalent bond
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classify each of the following properties as chemical or physical: acid…
Acidity: Chemical Combustibility: Chemical Viscosity: Physical
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question 4 of 10 what kind of force acts within a molecule? a. an inter…
B. An intramolecular force
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question 3 of 10 which of the following molecules contains a nonpolar c…
B. $H_2O$, C. $HCl$
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in the following descriptions the particles are atoms, molecules, or io…
Helium: The sample fills its container. Milk: Neither of the given descriptions. Sugar: The particles vibrate about fixed positions.
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question 2 of 10 which of the following is an important application of …
A. Holding DNA together
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why are van der waals forces important? a. they determine how strong di…
D. They are the primary intermolecular attractive forces that act between nonpolar molecules.
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the following illustrations represent different states of the substance…
Top: Solid; Middle: Liquid; Bottom: Gas
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5. how many light years across is the small magellanic cloud?
7000 light-years
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the atomic number of an atom is multiple choice the number of protons i…
the number of protons in the atom.
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what kind of bond is the result of the transfer of an electron? a. a hy…
C. An ionic bond
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question 9 of 10 why do atoms tend to be bonded to other atoms? a. atom…
D. Atoms form bonds to make the results more stable
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what kind of bond is present in nabr? a. covalent bond b. hydrogen bond…
C. Ionic bond
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question 7 of 10 which statement is the best description of a chemical …
D. A chemical bond holds atoms together.
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which of the following examples is a molecule with a covalent bond? (us…
D. CO
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question 5 of 10 which of the following diagrams is the correct electro…
B. $\cdot\ce{Al}\cdot$
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how many total valence electrons take part in a triple bond between 2 a…
D. 6
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what is a covalent bond? a. a bond between two atoms resulting from a t…
D. A bond between two atoms that is made up of shared electrons
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which of the following values best classifies a bond between 2 atoms as…
B. An electronegativity difference of greater than 1.7 between the atoms
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what kind of bond would two nonmetals typically make? a. an ionic solid…
B. A covalent bond