Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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summarize it! drag and drop the words or phrases that best complete the…
Matter, Physical, Density, Solubility, Conductivity, Magnetism, Boiling and melting
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practice it! physical properties describe how matter can be observed wi…
Sugar dissolves in water.
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water has a melting point of 32^{0}f (0^{0}c) and a boiling point of 21…
All the statements (Water has a melting point that can be seen in nature; The melting point of salt is higher than that of water; Salt would not melt or boil in nature on Earth's …
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5 select the correct answer. iron oxide reacts with aluminum to give al…
C. replacement
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3 select the correct answer. samuel adds a teaspoon of salt to a glass …
B. It's a physical change because the water and the salt kept their original properties.
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drag the tiles to the correct boxes to complete the pairs. identify the…
Food burns in oxygen gas and releases a lot of energy. → combustion
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select the correct answer. what kind of chemical reaction does the chem…
D. synthesis
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select the correct answer. which property of a substance can be determi…
A. acidity
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select the correct answer. daltons completing an investigation in the s…
A. boiling point
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drag each label to the correct location. classify each characteristic a…
| Metal | Nonmetal | |--|--| | shiny surface | dull surface | | good conductor of electricity | poor conductor of electricity | | good conductor of heat | poor conductor of heat |…
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select the correct answer. which sentence describes an example of subli…
C. Dry ice changes to carbon dioxide gas when kept in an open container.
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select the correct answer from each drop - down menu. andy has two samp…
Sample A is acidic, and sample B is acidic.
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drag each label to the correct location on the table. sort the processe…
| Thermal Energy Added | Thermal Energy Removed | |--|--| | melting, evaporation, sublimation | condensation, freezing, deposition |
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in the periodic table of elements, what do all of the elements in group…
C. Each element is an alkaline earth metal.
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the image shows a portion of the periodic table. which two elements hav…
C. fluorine and chlorine
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select the correct answer. salt is dissolved in a flask of tap water. d…
D. thermal energy
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select the correct metal. martina has a sample of an unknown substance.…
Aluminum
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identify bohrs model of the atom. his model describes the reactivity of…
D. D
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5 select the correct answer. mr. adams asked his students to write the …
B. \(Zn\)
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select the correct answer. the atomic number of krypton (kr) is 36, and…
C. 48
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select the correct answer. sodium (na) and potassium (k) are in the sam…
B. 1
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ionic bonds name the following ionic compounds (rule 1 and 2): 1. nabr …
1. Sodium bromide 2. Calcium oxide 3. Lithium oxide 4. Magnesium bromide 6. Beryllium hydroxide 7. Iron(III) chloride 8. Lead(II) oxide 9. Ammonium sulfate 10. Cobalt(II) sulfide …
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multiple - choice question what does hydrophobic mean? water - loving w…
water - fearing
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multiple - choice question what does hydrophilic mean? water - loving u…
water - loving
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conservation; accommodation conservation refers to the understanding th…
assimilation; accommodation
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find the error with subject - verb agreement. select the incorrect verb…
The incorrect verb is "are", and it should be "is".
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drawing bohr diagrams while the bohr model is an overly simplistic mode…
Boro
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would so₄²⁻ be used as an oxidizing agent or reducing agent in the reac…
oxidizing agent
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circle the misspelled word in the sentence, then write it correctly bel…
Circle "irellevant" and write "irrelevant" below.
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circle the misspelled word in the sentence, then write it correctly bel…
The misspelled word is "wòrd", and the correct spelling is "word".
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which statement about the reaction is true? fe + 3o₂ → 2fe₂o₃ oxygen ha…
Oxygen has an oxidation state of - 2 in \(Fe_2O_3\) (first option).
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what is the oxidation state of zinc in zn(oh)4^2-? 0 4+ 1+ 2+
\(2+\) (the fourth option)
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practice calculating the number of atoms using parenthesis • to find th…
- First blank: sub - script outside the parentheses - Second blank: \(2 + 3+12=17\)
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practice subscripts + coefficients · ___number at the beginning of a fo…
1. Big (or Coefficient) 2. Molecules 3. Coefficient 4. \(14\)
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practice subscripts + coefficients · number at the beginning of a formu…
1. Coefficient 2. molecules 3. coefficient; \(14\)
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problem: the oxygen in the atmosphere—the oxygen all animals breathe—ha…
Oxygen is found as \(O_2\) rather than O in nature because \(O_2\) satisfies the octet rule (each O atom has 8 valence electrons in \(O_2\)) and is more stable, while an isolated …
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question 43 1 pts not all gases are greenhouse gases. which of the foll…
a gas that absorbs heat that radiates away from the Earth's surface
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elements · a that cannot be broken down into another substance · each u…
1. pure substance 2. letter
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scientists sometimes want to show whether more energy is used or releas…
glucose + oxygen → carbon dioxide + water + energy
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this passage describes a chemical reaction. read the passage. then, fol…
| Substance | Reactant | Product | |--|--|--| | hydrogen sulfide (\(H_2S\)) | Yes | No | | oxygen (\(O_2\)) | Yes | No | | sulfuric acid (\(H_2SO_4\)) | No | Yes |
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this passage describes a chemical reaction. read the passage. then, fol…
| Substance | Reactant | Product | |--|--|--| | hydrofluoric acid (HF) | Yes | No | | sodium fluoride (NaF) | No | Yes | | sodium hydroxide (NaOH) | Yes | No | | water ($H_2O$) | …
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this passage describes a chemical reaction. read the passage. then, ans…
glucose (\(C_6H_{12}O_6\))
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this passage describes a chemical reaction. read the passage. then, ans…
water (\(H_2O\)), isoamyl acetate (\(C_7H_{14}O_2\))
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this passage describes a chemical reaction. read the passage. then, ans…
water (\(H_2O\)), carbon dioxide (\(CO_2\)), sodium chloride (\(NaCl\))
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this passage describes a chemical reaction. read the passage. then, ans…
Oxygen (\(O_2\)), Glucose (\(C_6H_{12}O_6\))
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the chemical formulae of some acids are listed in the first column of t…
| acid | strong or weak? | species present at \(10^{-6}\space mol/L\) or greater when dissolved in water | |---|---|---| | \(HBrO_4\) | strong | \(H^{+}, BrO_{4}^{-}\) | | \(HBr\)…
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short answer how would you calculate the total number of atoms in 2h₂so…
The total number of atoms in \(2H_2SO_4\) is \(14\). We first find the number of atoms in one \(H_2SO_4\) molecule (\(2\) \(H\), \(1\) \(S\), \(4\) \(O\): \(2 + 1+4 = 7\) atoms), …
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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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this passage describes a chemical reaction. read the passage. then, fol…
reactant
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multiple choice read each question carefully and circle the correct ans…
1. B. Hydrogen 2. A. 1 3. C. The number of atoms of that element 4. C. 6 5. B. 4
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the chemical formulae of some adds are listed in the first column of th…
| acid | strong or weak? | species present at \(10^{-6}\ mol/L\) or greater when dissolved in water | |---|---|---| | \(HClO_3\) | strong | \(H^{+},ClO_3^{-},H_2O\) | | \(HF\) | w…
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the chemical formulae of some acids are listed in the first column of t…
| acid | strong or weak? | species present at \(10^{-6}\text{ mol/L}\) or greater when dissolved in water | | ---- | ---- | ---- | | \( \ce{HClO3} \) | strong | \( \ce{H+}, \ce{Cl…
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for each chemical reaction in the table below, decide whether the highl…
| reaction | Bronsted - Lowry acid | Bronsted - Lowry base | neither | |---|---|---|---| | \(HClO_{3}(aq)+OH^{-}(aq)\to ClO_{3}^{-}(aq)+H_{2}O(l)\) | \(HClO_{3}(aq)\) | \(OH^{-}(a…
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complete the sentence with the correct plural. by chemically analyzing …
alloys
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16 tot le matin, alors que la température est de 10°c et la pression at…
\( 255\space kPa\) 17. a)
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atom: the smallest part of an element that still has the properties ele…
- Element: A pure substance made of only one kind of atom. - Compound: A pure substance formed when two or more elements are chemically bonded together. - Mixture: A combination o…
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try again your answer is incorrect. for each chemical reaction in the t…
| reaction | highlighted reactant | |--|--| | \(ClO_{3}^{-}(aq)+NH_{4}^{+}(aq)\to HClO_{3}(aq)+NH_{3}(aq)\) | Bronsted - Lowry acid | | \(HClO_{3}(aq)+NH_{3}(aq)\to ClO_{3}^{-}(aq…
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m - a = n to comple 30 zinc 65.39 atomic # = atomic mass = # of protons…
Atomic # = 30 Atomic Mass = 65.39 # of Protons = 30 # of Neutrons = 35 # of Electrons = 30
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apply the rules of a = p = e atomic # = atomic mass = # of protons = # …
Atomic # = \(8\) Atomic Mass = \(15.999\) # of Protons = \(8\) # of Neutrons = \(8\) # of Electrons = \(8\)
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electrolysis is when chemicals break down into charged particles, calle…
A. Ions
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atoms that lose ______ become positively charged. select one: ○ a. elec…
A. Electrons
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what ion is formed when an atom of mercury (hg) loses two electrons? hg…
Hg⁺²
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nonmetals form covalent bonds (shared electron pairs) with other atoms.…
A. the number of additional electrons the nonmetal needs to fill its valence shell
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which formula accurately represents a neutral ionic compound? choose 1 …
A. \(BaO\)
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use the reaction to answer the question. c₁₀h₈ + 12o₂ →? which products…
C. \(10CO_2 + 4H_2O\)
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using the table of standard formation enthalpies that youll find under …
$-6542\ kJ$
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which option describes something that causes ionic bonds to form? (1 po…
large electronegativity differences
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approximately in which range of electronegativity differences would pol…
0.5 to 1.7
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use the equation to answer the question. ch₄ + ______cl₂ → ccl₄ + _____…
4, 4
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sodium hydroxide (naoh) and hydrochloric acid (hcl) combine to make tab…
\( \text{NaOH} + \text{HCl} ightarrow \text{NaCl} + \text{H}_2\text{O} \)
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a coefficient serves which purpose in a chemical equation? (1 point) it…
It shows how many molecules there are of a particular substance.
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which statement best represents the law of conservation of matter with …
The reactants and products have the same number and type of atoms, but the atoms may be recombined.
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how many electrons does hydrogen have in its valence shell when it is f…
one, seven, eight, two
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the half - life of palladium - 100 is 4 days. after 20 days a sample of…
The initial mass of the sample is \(32\) mg. The mass 8 weeks after the start is approximately \(0.0020\) mg.
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completa este cuestionario para finalizar la tarea de química moderna q…
Tritio
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2. we learned in class that oil is not soluble in water. what is solubi…
A. The ability of a substance to dissolve in a solvent
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rows on the period table are called ____ while columns are called ____.…
Rows on the period table are called periods while columns are called groups, families.
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which of the following elements in period 3 would be classified as a me…
Sodium
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boyles law explains the way to develop an idea and design an experiment…
the relationship between pressure and the volume of gas.
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if we have a sample of silicon (si) atoms that has 14 protons, 14 elect…
silicon - 32
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the model below shows a calcium atom. how many electrons are in the thi…
2
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the model below shows a carbide ion. what could be done to change this …
remove 2 electrons
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uranium is an element that is often used in nuclear power plants. urani…
They each have the same number of protons.
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4. propane is a commonly used barbeque fuel. determine the efficiency o…
The efficiency of the barbeque is \(31.1\%\)
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insert two dashes where needed. at sunfest organic farm a cutting - edg…
At Sunfest Organic Farm—a cutting - edge herb farm in Okeechobee, Florida—the herbs are washed with ultraviolet light in a vacuum - sealed room.
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ariana garcia apontes practice mm.2 order adject 9 put the words in the…
the successful chemistry experiment
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ariana garcia apontes practice mm.2 order adjec 9 put the words in the …
the successful chemistry experiment
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match each characteristic of minerals to the correct description. solid…
- solid: having a definite volume and shape - crystal structure: particles line up in a repeating pattern - inorganic: not formed from living or once living things - naturally occ…
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explain what does the color of each box tell you about the element? met…
The color of each box indicates whether the element is a metal, metalloid, or non - metal.
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identify label the element key.
Atomic number
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identify label the element key.
- The number \(2\) is the atomic number. - \(He\) is the element symbol. - “Helium” is the element name. - \(4.003\) is the atomic mass.
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apply it interpret a team of scientists studying the surface of a new p…
- **Mendeleev's Arrangement (by atomic mass)**: A (60.4), I (63.1), C (63.4), D (62.7), G (65.0), E (68.2), J (68.3), B (70.4), F (70.9), H (71.2) - **Moseley's Arrangement (by at…
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predicting properties of undiscovered elements when mendeleev arranged …
Atomic mass.
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patterns in properties the term periodic meansrepeating pattern. for ex…
The melting points of elements in rows 2 and 3 of the periodic table show a pattern of first increasing and then decreasing.
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developing a periodic table in 1869, a russian chemist and teacher name…
1. Density 2. Color 3. Melting point 4. Atomic mass
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what is the periodic table? the junk drawer in the figure is full of pe…
There are about 118 elements. Scientists use a periodic table to organize the elements. The periodic table is a chart of the elements arranged into rows and columns according to t…
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explain organize information about the periodic table in the chart belo…
There are about 118 elements. Scientists use the periodic table to organize elements. The periodic table is a tabular arrangement of chemical elements, ordered by their atomic num…
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a sample of a radioactive metal starts with a mass of 400 grams. when a…
For the first question: 25 grams. For the second question: Not enough information to solve this.
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what element should go in the empty box in this equation? 79 33 as → 0 …
Selenium - 79 (the first option)