Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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use scientific notation quick check sam is comparing the half - life of…
B. $2.81\times 10^{4}$
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13.2 describe the different levels of federal courts, expansion of fede…
a class - action lawsuit.
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which chemical reaction below is cellular respiration? 6o₂ + c₆h₁₂o₆ → …
The chemical reaction $C_6H_{12}O_6+6O_2 ightarrow6CO_2 + 6H_2O$ (the first reaction shown in the image) is cellular respiration.
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use scientific notation quick check in chemistry class, carlos calculat…
B. $6.02\times 10^{25}$
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1. in the blank, label the elements or properties as metal(m), nonmetal…
1. Metal (M): Potassium, Chromium, Sodium, Cobalt, Calcium; Non - metal (NM): Argon, Arsenic, Neon, Nitrogen, Radon; Metalloid (met): Silicon, Antimony 2. Metals are lustrous and …
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2.1 the nature of matter 1. in the atom, which particles are in constan…
1. d. electrons 2. Sodium chloride has different properties from sodium and chlorine. Sodium is a reactive metal, chlorine is a toxic gas, and NaCl is a common - salt. 3. Isotopes…
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a physical change ____ change the composition or identity of the substa…
1. B. will not 2. A. crushing a rock 3. A. changes in the phase of matter
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which sign is not for a chemical change? a color change b change in vol…
1. B. change in volume 2. B. mass is conserved 3. C. the burning of wood
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the first reaction bubbled because a ______ was formed. a gas b liquid …
1. A. gas 2. B. precipitate 3. A. chemical
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the reactivity of an element is based on its _________. a protons b ele…
1. B. electrons 2. A. Outer 3. B. Combustibility
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ms. crawford gave the following instructions to her science class: • pl…
A. chemical - gas produced
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brad and juan conducted several tests to determine the properties of si…
B. Silver reacts with nitric acid to produce a gas.
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salt plus water two compounds mixed together to form a solution. the wa…
C. The separation of the two is based on the different boiling points of the salt (higher) and the water (lower) when the solution is heated.
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a student takes four samples of a white crystalline solid and places ea…
A. The solid dissolves quickly
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ms. sloans students are studying changes and heat energy in science. th…
B. Heating the solid sugar cubes caused evaporation and the sugar disappeared and something new to form and a chemical change to occur.
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electron configuration practice worksheet in the space below, write the…
1. Sodium: $1s^{2}2s^{2}2p^{6}3s^{1}$ 2. Iron: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{6}$ 3. Bromine: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{5}$ 4. Barium: $1s^{2}2s^{2…
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how does matter change? that was a question students were investigating…
C. Chemical; a gas was produced and the temperature changed.
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barnard and juan conducted several tests to determine the properties of…
C. When the silver was dropped into nitric acid, a gas was released.
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part a consider the images depicting change. which statement accurately…
D. The pipes in image I are going through a chemical change called rusting; the evidence is the color change.
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critical read for properties and changes of matter activate: first read…
| WORD | + | / | - | Example | Definition | | ---- | ---- | ---- | ---- | ---- | ---- | | physical | + | | | Melting point is a physical property. Ice melts at 0°C. | A characteri…
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the selection states that many odor testers have a college degree. whic…
C. chemistry, because they need to study the chemical makeup of products
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classify the following statements as heterogeneous mixture, a suspensio…
1. Heterogeneous mixture 2. Solution (homogeneous mixture) 3. Heterogeneous mixture 4. Colloid 5. Heterogeneous mixture 6. Solution (homogeneous mixture) 7. Heterogeneous mixture …
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elements, compounds, and mixtures classify each of the pictures below b…
1. B 2. C 3. E 4. D 5. A 6. B 7. A 8. E 9. E 10. E 11. B 12. B 13. B 14. D 15. E
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signs that say \do not use near an open flame\ refer to a(n) a energy p…
B. chemical property
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which image displays a chemical property about a substance? choose all …
A. II and IV
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a device used to separate fresh water from salt water using heat is cal…
C. still
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use the formula for density, d = m/v, where d is density, m is mass, an…
A. Substance A, C. Substance C
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a 0.150 m sodium chloride solution is referred to as a physiological sa…
2.41 g
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matter has many properties. physical properties do not change the compo…
Chemical Property: Reactivity, pH, Toxicity, Combustibility Physical Property: Melting point, Hardness, Color, Density, Mass
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freezing point where would you place this property in the venn diagram?
A. A
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14. classify the following as heterogeneous or as homogeneous: sand & s…
Question 14: Sand & salt mixture: Heterogeneous Hydrogen: Homogeneous Iron: Homogeneous Salt water: Homogeneous Unfiltered air: Homogeneous Iron with rust: Heterogeneous Pure wate…
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what happens in the story that leads you to believe this? what is the t…
The marketing team has a conflict over the color scheme for a soft - drink campaign and brings in an outside consultant to solve it.
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drag the right word to its definition the smallest particle of an eleme…
atom - the smallest particle of an element that can exist.
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drag the missing word into place. during a chemical change, existing at…
bonds
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drag the right word to its definition. a change in how the atoms of one…
chemical change
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13. classify the following as pure substances or as mixtures: air, gaso…
13. - Air: Mixture - Gasoline: Mixture - Grain alcohol: Pure substance - Water: Pure substance - Sugar: Pure substance - Gold: Pure substance - Mercury: Pure substance - Oxygen: P…
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what is the iupac name of the ion formed by phosphorus? a) phosphide(ii…
C. Phosphide
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what type of ion does phosphorus form and why? a) a cation, because it …
d) An anion, because it is a nonmetal
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drag the missing word into place. cutting down a branch from a tree is …
physical change
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10. explain how to separate the sugar and water in a solution of sugar …
10. Evaporate the water to get sugar crystals. 11. Use distillation to separate alcohol and water. 12. Use filtration to separate sand and water.
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during a chemical change, existing rearrange themselves to form new che…
atoms
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energy from an atom: flame test directions: carefully hold the wooden s…
1. Arrow from ground state to excited state: Absorption of energy. Arrow from excited state to ground state: Emission of energy. 2. The ground state is the most stable energy stat…
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a type of physical matter or material. chemical change physical change …
substance
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drag the missing word into place. once something undergoes a , it can u…
chemical change
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earlier, you named oxygen, sulfur and iodine. which element is a metal,…
B. Neither of them
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which description is an example of direct characterization? a. the actr…
C. Amir was always in good spirits – his laugh would bubble through the room, infecting those around him with giggles.
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question 3 of 4 points possible: 1.00 in a certain compound of iron and…
d. Fe₂O₃
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question 2 of 4 < points possible: 1.00 which of the following is true …
d. Calcium hydroxide is produced.
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question 1 of 4 points possible: 1.00 not yet answered a 0.784 g sample…
c. 0.0323 mol
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after reading the infographic, put the stages of the circular process i…
1. Plastic waste is collected. 2. The plastic is sorted. 3. The plastic waste is heated. 4. The plastic waste is turned into liquid. 5. New chemicals are produced. 6. The chemical…
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writing prompt the endocrine system works a lot like the behind - the -…
The pituitary gland is like the principal of a school. Just as a principal is in charge of overseeing teachers and making sure the school runs smoothly, the pituitary gland is oft…
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which statement best describes how electrons fill orbitals in the perio…
Electrons fill orbitals in order of their increasing energy from left to right.
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what is the atomic number of zirconium? 39 40 41 42
B. 40
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which characteristic is given by the angular momentum quantum number? o…
orbital shape
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which substance is a mixture? o table salt o gasoline o aluminum o carb…
gasoline
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which physical method can be used for obtaining a sample of salt from a…
boiling
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a single atom of an element has 11 protons, 11 electrons, and 12 neutro…
Na
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which element has 32 protons in its nucleus? phosphorus cobalt germaniu…
germanium
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daltons atomic theory revived the idea of the atom. true false
True
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question 1 who determined that the sum of the masses of the reactants o…
A. Lavoisier
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atoms can be changed from one type to another. true false
True
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question 1 who postulated for his atomic theory that \all matter is com…
A. Dalton
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you will want to have an understanding of the vocabulary we went over i…
1. Pavlov's study showed learning as an associative process via classical conditioning. 2. Initial stage of learning - b. Acquisition; Pairing conditioned stimulus with new neutra…
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5. why do we need to know the chemical properties of substances in indu…
5. In medicine, for drug - related aspects and safety; in construction, for material selection. 6. a) Reactivity with oxygen. b) Formation of new substance, color change, loss of …
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2. which electron configuration represents an atom in an excited state?…
2 - 7 - 1
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3. which electron configuration represents an excited state for a potas…
2 - 8 - 7 - 2
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5. what is the total number of partially occupied 2p orbitals in a nitr…
3
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5. why do we need to know the chemical properties of substances in indu…
5. In medicine, for drug - making and safety; in construction, for material choice. 6. a) Reactivity with oxygen and water. b) New substance formation, color change, loss of origi…
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2. which electron configuration represents an atom in an excited state?…
2 - 7 - 1
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1. which species does not have a noble gas electron configuration? s ar…
S
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read this excerpt from walt whitmans poem \i hear america singing\ from…
A. present a poem with a natural, conversational rhythm.
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molecule is best described as being identical to the resonance structur…
1. A hybrid of average of all the contributing resonance structures. 2. To reflect the overall charge of the ion.
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consider the lewis structure for ozone (o₃), which has one single bond …
1. +1 2. $O = S = O$ (formal charges: $O = 0,S = 0,O = 0$)
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how many total valence electrons are present in a carbonate ion (co₃²⁻)…
The total number of valence electrons in a carbonate ion ($CO_{3}^{2 -}$) is 24. The number of covalent bonds in the ammonium ion ($NH_{4}^{+}$) is 4. The formal charge on the nit…
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match each word to its definition. the smallest unit of a chemical elem…
1. c. atom 2. e. electron 3. d. force 4. b. neutron 5. a. proton
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how many total valence electrons are present in a molecule of carbon di…
For the first question: None of the options are correct. For the second question: O=C=O (assuming the option with double bonds is the one represented as O=C=O among the given choi…
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according to the octet rule, most atoms in neutral compounds strive to …
1. A. 8 2. A. $BF_3$
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according to the octet rule, most atoms in covalent compounds strive to…
1. D. 8 2. B. $BF_3$
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blewis@stu.kountzeisd.org which of the following best defines valence e…
1. Electrons in the outermost energy level of an atom that are involved in chemical bonding. 2. 5
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2. using the picture above, how many atoms of carbon are in the compoun…
3. 12 4. 24
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1. using the picture below, how many elements are in the compound? * gl…
1. 3 2. 6
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1. using the picture below, how many elements are in the compound? * gl…
3
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classify each substance below using the items in the answer key: drag a…
1. Heterogeneous Mixture 2. Element 3. Compound 4. Homogeneous Mixture
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classify each substance below using the items in the answer key: substa…
Salt Water: Homogeneous Mixture Chlorine: Element Hydrochloric Acid (HCl): Compound Salad: Heterogeneous Mixture Aluminum: Element
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use the answer bank to complete the diagram below: drag and drop matter…
From top - left to bottom - right: Pure Substance, Element, Compound, Mixture, Homogeneous Mixture, Heterogeneous Mixture
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use the answer bank to classify each of the mixtures below: tacos, pain…
Tacos: Heterogeneous Paint: Homogenous Wood: Heterogeneous Tea: Homogenous Apple Juice: Homogenous Raw Eggs: Heterogeneous
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types of mixtures homogeneous mixtures: a uniform composition. parts of…
Cookies: Heterogeneous Coffee: Homogeneous Pizza: Heterogeneous
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use the answer bank to classify each pure substance below: neon carbon …
Neon: Element Carbon: Element Carbon Dioxide: Compound Gold: Element Ice: Compound Table Salt: Compound
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types of pure substances elements: made of only one type of atom. compo…
Silver: Element Water: Compound Oxygen: Element
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vocabulary worksheet: atoms, elements, and the periodic table match eac…
1. L 2. T 3. G 4. D 5. X 6. S 7. K 8. E 9. Z 10. J 11. E 12. V 13. M 14. P 15. O 16. N 17. Q 18. Y 19. I 20. G 21. A 22. A 23. W 24. T 25. C 26. F
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use words from the word - bank to complete the sentences. word bank: de…
1. Subscript; Chemical change; Solution; Toxicity; Boiling - point; Catalyst; Reactant; Solubility; Exothermic reaction; Density 2. The Law of Conservation of Mass states that in …
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use words from the word - bank to complete the sentences. word bank: de…
1. Subscript; Chemical change; Solution; Toxicity; Boiling point; Catalyst; Reactant; Solubility; Exothermic reaction; Density 2. The Law of Conservation of Mass states that in a …
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subscript yield products reactant open - system closed - system malleab…
Subscript: S. Number that tells how many atoms of each element are in a compound Products: U. New substances formed as a result of a chemical reaction Reactant: Q. A substance tha…
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directions: match each vocabulary word with the correct definition. wri…
Physical property - B Chemical property - K Physical change - (No correct option in given) Chemical change - C Reaction - J Catalyst - A Precipitate - H Law of Conservation of Mas…
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question 4 rustenburg/september 2024 the balanced equation below repres…
4.1 The reaction is EXOTHERMIC because the energy of the reactants ($351\ kJ.mol^{-1}$) is greater than the energy of the products ($109.2\ kJ.mol^{-1}$). 4.2 $\Delta H=-241.8\ kJ…
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in 1974, mexican chemist mario molina and us chemist f. sherwood rowlan…
A. Specifically,
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after the addition of an acid, a solution has a volume of 90 milliliter…
43.5 milliliters
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6. an unknown group iia metal oxide weighs 19.8 g and would equate to 0…
The unknown metal is magnesium ($Mg$).
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1. calculate the number of moles in 5.56 x 10^24 atoms of sodium sulfat…
1. $9.2\text{ mol}$ 2. $0.098\text{ mol}$ 3. $2.22\text{ mol}$
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chemistry 2202 assignment e name: claire healey answer each of the ques…
1. $n_1=\frac{5.56\times 10^{24}}{6.022\times 10^{23}}\approx9.23\text{ mol}$ 2. $n_2=\frac{14.6}{149.12}\approx0.0979\text{ mol}$ 3. $n_3=\frac{49.7}{22.4}\approx2.22\text{ mol}$