Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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select the true statements. a sodium atom has eleven valence electrons.…
Las afirmaciones verdaderas son: - A chemical bond forms when valence electrons of one atom are attracted to the nucleus of another atom. - The electrons farthest from an atom's n…
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classify each bond as covalent, ionic, or metallic according to its des…
- The type of bond in \( \text{MgCl}_2 \): Ionic (marcar el círculo bajo "Ionic") - The type of bond that has a sea of moving electrons: Metallic (marcar el círculo bajo "Metallic…
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does the model correctly represent the electron dot diagram of magnesiu…
Yes, because the chemical symbol of magnesium is Mg., Yes, because magnesium has two valence electrons.
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freely moving electron na nucleus select all the true statements. metal…
The true statements are: - In a metal, valence electrons are shared among all of the atoms in the material. - In a metal, valence electrons move freely throughout the entire latti…
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determine whether each statement is true or false. both the bohr model …
- "Both the Bohr model and the Lewis dot structure represent an ionic bond formed between two nonmetal atoms.": False - "A sodium cation has eight valence electrons.": True - "Val…
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5. instant ramen seasoning packet the seasoning packet effectively diss…
100.28°C
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metal atom nonmetal atom ionic compound compare the sodium atom and chl…
A sodium atom has \boxed{1 valence electron}, and a chlorine atom has (7 valence electrons, pero en las opciones dadas, la tercera opción para el final es) \boxed{8 valence electr…
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bohr model of cl₂ or lewis dot structures of cl₂ in a lewis dot structu…
- A chlorine molecule has 34 total electrons, 14 of which are valence electrons. - There are six lone pairs in a chlorine molecule.
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6. salt for de-icing roads road crews spread rock salt on icy pavement,…
-1.59°C
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een two nonmetal chlorine atoms. two chlorine atoms, electrons, combine…
2
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nonmetal atom nonmetal atom covalent compound complete the sentences. a…
1. nonmetal 2. 7 3. share 4. 8 (or "eight" for context, but 8 is the octet count) (Note: The dropdowns likely have options like "nonmetal/metal" for first, "7/other" for second, "…
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a covalent bond is formed when two atoms share one or more pairs of ele…
A covalent bond forms between two $\boldsymbol{\text{nonmetal}}$ chlorine atoms. Two chlorine atoms, each with $\boldsymbol{7}$ valence electrons, combine by sharing $\boldsymbol{…
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how many phosphorus atoms are in the formula below (only type the numbe…
3
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order the steps to take when drawing electron dot diagrams. count the d…
1. Use the periodic table to find the chemical symbol of the atom and the number of electrons in the valence shell. 2. Write the chemical symbol of the atom. 3. Draw dots around t…
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select all the true statements. in metallic bonding, a pair of electron…
- "Valence electrons move freely throughout a metal" (la tercera afirmación) - "Metallic bonding occurs between metal atoms" (la cuarta afirmación)
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bohr model of nacl lewis dot structure of nacl select the true statemen…
- Valence electrons are shown in the Lewis dot structure of a chloride anion. (True) - Valence electrons are shown in the Bohr model of a sodium cation. (False, should be unchecke…
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Question was provided via image upload.
Atomic number: 44; Number of electrons: 44; Remaining electrons: 8; Orbitals: \(5s\), \(4d\); Electron configuration: \([Kr]5s^{1}4d^{7}\)
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describing electron dot diagrams what information is shown in an atoms …
the number of valence electrons an atom has
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identifying types of chemical bonds calcium chloride is used to make pi…
Calcium chloride contains ionic bonds. Pennies contain metallic bonds. Hydrochloric acid contains covalent bonds.
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becomes a positively charged cation, and the nonmetal atom becomes a ne…
Para completar la tabla de número de electrones de valencia: - **Sodium atom (átomo de sodio)**: 1 (pertenece al grupo 1, tiene 1 electrón en su nivel de valencia). - **Chlorine a…
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explaining the octet rule sample response: no, it does not, because the…
The octet rule says that atoms need to have eight electrons to be stable, except for hydrogen and helium, which need only two electrons. This atom has only one electron, so it doe…
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bohr model of cl₂ lewis dot structures of cl₂ in a lewis dot structure,…
A chlorine molecule has 14 total valence electrons. There are three lone pairs in a chlorine molecule. There are two bonding electrons in a chlorine molecule.
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does this atom satisfy the octet rule? why or why not? (image of a sodi…
No, this sodium atom does not satisfy the octet rule because its outermost shell contains only 1 valence electron instead of 8.
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7. which of the following is not a transition metal? (a) mg b. ti c. cr…
a. Mg ### Question 8
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complete the sentences. a covalent bond forms between two chlorine atom…
1. nonmetal 2. 7 3. 2 4. 8 (Asumiendo que los espacios en blanco son, en orden: el primer dropdown es para "nonmetal", el segundo para 7, el tercer para 2, el cuarto para 8)
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match each type of bond to the correct description. bond in chlorine ga…
- bond in chlorine gas: electrons are shared - bonds in table salt: electrons are transferred
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1 mole = 6.02 × 10²³ particles (atoms, molecules or formula units) 1 mo…
a. \(3.11\times 10^{24}\) molecules
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unit 6 test moles record your answer in the blank provided. only the an…
b. mole ### Question 2
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this table shows the electronegativity. element | electronegativity f |…
When sulfur and oxygen react, valence electrons are **shared** between the atoms because their EN difference is **less than** two. When magnesium and oxygen react, valence electro…
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element | character | electronegativity f | nonmetal | 3.98 o | nonmeta…
- In general, metal atoms have lower electronegativities than nonmetal atoms. - Atoms with high electronegativities tend to gain or share electrons when forming chemical bonds. - …
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complete the sentence. atoms form chemical bonds to satisfy the ule{1cm…
octet; stable (or chemically stable)
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toms tend to lose, or give up, valence electrons when forming chemical …
Las afirmaciones verdaderas son: - Magnesium atoms tend to lose electrons when forming chemical bonds. - Oxygen atoms tend to gain or share electrons when forming chemical bonds. …
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1. make sure you can name and identify the charge and valence electron …
c. Br (Bromine) should have chemical properties similar to F (Fluorine) because elements in the same group of the periodic table (Group 17 for both F and Br) have the same number …
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complete the sentences. an oxygen atom is less stable than a neon atom.…
2
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complete the sentences. an oxygen atom is less stable than a neon atom.…
increase
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which model represents the electron dot diagram of silicon? si (with do…
The Left Graph (Si with 4 dots)
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complete the sentences. an oxygen atom is than a neon atom. an oxygen a…
An oxygen atom is \boxed{less stable} than a neon atom. An oxygen atom will \boxed{gain electrons} to fill its valence shell. (Nota: Aunque la segunda parte no tenía opciones visi…
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ectrons in their valence shell. are the bohr models of neon and oxygen.…
An oxygen atom is \boxed{larger} than a neon atom. An oxygen atom will \boxed{increase} its electron count by \boxed{gaining 2 electrons} to fill its valence shell. (Nota: La terc…
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are not stable enough to exist in nature as individual atoms. noble gas…
Helium has $\boldsymbol{2}$ valence electrons, neon has $\boldsymbol{8}$ valence electrons, and argon has $\boldsymbol{8}$ valence electrons. All three noble gases have $\boldsymb…
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using the periodic table, identify the number of valence electrons in a…
Para Na: 1 Para N: 5 Para Ne: 8 (En la tabla, los espacios en blanco deberían ser llenados con 1, 5 y 8 respectivamente para Na, N y Ne.)
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select the true statements. a chemical bond forms when electrons of one…
B. A chlorine atom has seven valence electrons, C. Valence electrons can be shared between atoms or transferred from one atom to the other, D. Atoms combine by forming metallic, c…
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continue to add dots moving clockwise around the symbol. click the loca…
The location below the Cl symbol.
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sodium metal chlorine gas table salt why do sodium metal, chlorine gas,…
B. When atoms of two different elements bond, they form a new compound with unique properties. D. In table salt, sodium and chlorine are held together by chemical bonds.
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construct the electron dot diagram for chlorine. click or tap the locat…
The first dot should be placed at the top position around the Cl symbol.
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construct the electron dot diagram for chlorine. step 1: use the period…
7
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construct the electron dot diagram for chlorine. step 1: use the period…
Cl (the option labeled "Cl")
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using the periodic table to find the number of valence electrons of an …
4
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in this exercise you will: * apply naming practices to unknown compound…
The completed tables are as shown above. For the practice table, each compound's name, formula, and ionic/covalent nature are filled. For the challenge table, the systematic names…
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how knowing changes directions: jean piaget studied thousands of childr…
| Piaget's Stages | Characteristics of Stage | Example of Schema | Criticisms | |--|--|--|--| | Sensorimotor | Infants use senses and motor actions; object permanence develops | C…
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3. saltwater for cooking pasta ≈0.598℃ a chef adds 25.0 g of nacl to 1.…
100.44°C
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describing types of chemical bonds match each bond with the rearrangeme…
ionic bond → transferring of electrons covalent bond → sharing of electrons metallic bond → sharing of many electrons
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a chemical test is used to measure reaction time blood alcohol content …
Blood alcohol content (the option labeled "Blood alcohol content" in the list)
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persuasive language lets focus on logos logos is an appeal to logic; it…
### Task One: 1. Effective? Yes Explain: Valid syllogism with true premises. 2. Effective? No Explain: False premise (“everyone has children”) undermines logic. 3. Effective? Yes …
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question 19 1 pts what does the law of multiple proportions account for…
subscripts in chemical formulas ### Question 20
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consider this reaction: li₃n (s) + 3h₂o (l) ⟶ nh₃ (g) + 3lioh (l) you n…
117 g
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ammonia (nh₃) can be produced by the reaction of hydrogen gas with nitr…
First question: \(60\%\) (the second option in the first multiple - choice question) Second question: The product participates in a side reaction (the third option in the second m…
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what is the formula mass (molar mass) of sucrose (c₁₂h₂₂o₁₁), table sug…
\(342\ g/mol\) ### Question 15
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a cookie recipe is provided. chocolate chip cookie recipe: 1 cup of flo…
chocolate chips
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question 12 1 pts consider this hypothetical reaction: a + 3b \\longrig…
A. \(A/B\)
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when aluminum oxidizes in air, it forms aluminum oxide (al₂o₃): 4al (s)…
27 g
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get it? cite evidence how do the properties of electrons influence the …
Electrons' properties, such as their number (especially valence electrons), distribution (electron configuration), and behavior (e.g., delocalization in metals), influence an elem…
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when ethane (c₂h₆) burns, it produces carbon dioxide and water: 2c₂h₆ (…
A. \(179\space L\)
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part a. write the chemical formula for each of the following compound. …
1. $H_2S$ 2. $K_2O_2$ 3. $Fe(HSO_4)_2$ 4. $NH_4IO_3$ 5. $HNO_3$ 6. dinitrogen pentoxide 7. magnesium chloride hexahydrate 8. manganese(IV) carbonate 9. phosphoric acid 10. cobalt(…
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consider this reaction: h₂ (g) + cl₂ (g) ⟶ 2hcl (g) how many liters of …
22.4 L
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which statement is true about 22.4 l each of hydrogen, ammonia, and ura…
The gases have the same number of molecules.
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which statement is true about 22.4 l each of hydrogen, ammonia, and ura…
24 moles
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what is the formula mass of calcium sulfate dihydrate caso₄·2h₂o? be su…
172 g/mol
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what is the formula mass of calcium sulfate dihydrate caso₄·2h₂o? be su…
34 L
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approximately how many particles are in 2 moles? 1.8 x 10²⁴ 1.2 x 10²⁴ …
For the first question: \(1.2\times 10^{24}\) For the second question: \(72\space g\)
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get it? explain how to write the noble-gas notation for an element. wha…
The noble - gas notation for calcium is \([\text{Ar}]4s^{2}\).
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two molecules of one reactant combine with 3 molecules of another to pr…
\(2A + 3B ightarrow5C\) ### Question 2
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which chemical formula reflects the diagram? 6o12h6c 6c12h6o o₆h₁₂c₆ c₆…
\(C_{6}H_{12}O_{6}\) (the last option)
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get it? state the three rules that define how electrons are arranged in…
The three rules are: - Aufbau principle: Electrons fill orbitals starting from the lowest energy level. - Pauli exclusion principle: Each electron has a unique set of quantum numb…
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question 4. which of the following diagrams has arrows that point in th…
The third diagram (the one with vertical red arrow pointing down and horizontal red arrow pointing left)
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question 9 1 pts carbon dating requires that the object being tested co…
A. organic material.
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question 8 1 pts different isotopes of an element have different number…
D. neutrons (assuming the last option is D; if options are labeled as per the order: the option "neutrons" is the correct one, so if the options are A. protons, B. hadrons, C. pho…
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12. how many atoms are found in 6.00 moles of calcium oxide? options: 3…
3.62 × 10²⁴ (the first option, e.g., A. 3.62 × 10²⁴)
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nitrogen gas is considered a diatomic molecule. what is the mass for on…
First box: 28, Second box: g/mol
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question 7. four elements are shown in the diagram below. based on thei…
Element 1
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10. directions drag and drop the correct answer choice to each answer b…
First box: 44.01, Second box: g/mol
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question 6. rank the following atoms in order of decreasing electronega…
Chlorine (Cl) > Phosphorus (P) > Lithium (Li) > Barium (Ba)
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9. what volume at stp does 88.0 g of co₂ occupy? options: 44.79l, 22.40…
44.79L
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question 5. rank the following atoms in order of increasing electronega…
Potassium (K) < Calcium (Ca) < Nitrogen (N) < Fluorine (F)
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question 4. which of the following elements are less electronegative th…
B. Germanium (Ge), D. Magnesium (Mg)
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7. how many hydrogen atoms are there in 7.30 moles of ethanol (c₂h₅oh)?…
2.64 × 10²⁵ atoms (corresponding to the option "2.64 × 10²⁵ atoms")
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question 3. which element in each pair is more electronegative? a) as, …
a) As b) N c) Be
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6. which of the following is the mass in grams of 4.25 × 10⁻³ mol of n₂…
\(1.19\times 10^{5}\space g\) (the option with \(1.19\times 10^{5}\space g\))
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4. what is the molar mass of cacl₂? options: 110.98 g/mol, 75.53 g/mol,…
110.98 g/mol (the option with 110.98 g/mol)
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3. what is the molar mass of kbr? 54.0 g/mol 74.1 g/mol 119 g/mol 1.20 …
119 g/mol (the option with "119 g/mol")
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question 1. the figure below illustrates the electronegativity of diffe…
The ability of an atom in a chemical bond to attract shared electrons towards itself. ### Part B
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2. which of the following has the highest mass? 50.0 l of oxygen at stp…
50.0 mol NaCl
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1. what mass of sulfur would have precisely 4.7×10²² atoms of sulfur? 2…
2.50 g sulfur
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12 how many atoms are found in 6.00 moles of calcium oxide? clear all 1…
\(3.62\times 10^{24}\)
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12 how many atoms are found in 6.00 moles of calcium oxide? clear all 1…
\(3.62\times 10^{24}\) (assuming some rounding differences in the problem - provided options, if we consider \(6.00\times6.02\times10^{23}\times1\) (wrongly taking 1 atom per form…
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5. how many moles are there in 1.505 × 10²⁴ molecules of water, h₂o?
\(2.5\) moles
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exit ticket 6 (module 5 - lesson 2) question 3. using the periodic tren…
The order from least electronegative to most electronegative is: Potassium (K), Lithium (Li), Silicon (Si), Bromine (Br), Nitrogen (N)
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question 2. based on the periodic trend of electronegativity, which of …
B. Oxygen (O)
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complete the sentence with the best relative pronoun. in 1733, english …
which
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atomic theory and basic structure contributor/date\tcontribution\tmodel…
| Contributor/date | Contribution | Model (sketch) | | ---- | ---- | ---- | | John Dalton (1803) | Proposed atomic theory (atoms are indivisible, unique to elements, fixed ratios …
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name | ionic or covalent? | formula iron (ii) fluoride | | sodium sulfi…
| Name | Ionic or Covalent? | Formula | |------|---------------------|---------| | Iron (II) Fluoride | Ionic | \(FeF_2\) | | Sodium Sulfide | Ionic | \(Na_2S\) | | Tricarbon Hept…