Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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6. explaining why salts used in food processing tend to be hard solids …
Salts used in food processing are ionic compounds with a tightly bound ionic lattice held by strong coulombic attractions between oppositely charged ions. This strong, ordered ion…
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name directions: answer the questions based on the clusters on chemical…
1. b) Long chains of atoms bonded together within each molecule 2. | Substance | Type of Bonding (Ionic or Covalent) | Evidence | |-----------|------------------------------------…
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procedure: using your computer, tablet or mobile device, navigate to th…
1. Sodium (Na) a. Alkali Metal (Group 1 Metal) b. 1 2. Fluorine (F) a. Halogen (Group 17 Nonmetal) b. 7 3. Ionic bond 4. Lewis Dot Diagrams: - Na: $\ce{Na \cdot}$ [LLM SSE On Fail…
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1.16-chem review when smaller atoms combine to create a new larger atom…
C. Nuclear fusion
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stomach acid ph= 1 ☐ neutral ☐ basic vinegar ph= 3 ☑ acidic ☐ neutral ☐…
### Corrected pH Category Assignments: 1. Stomach Acid (pH=1): ☑ Acidic, ☐ Neutral, ☐ Basic 2. Vinegar (pH=3): ☑ Acidic, ☐ Neutral, ☐ Basic 3. Water (distilled) (pH=8): ☐ Acidic, …
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1.16-chem review protons and neutrons make up the mass of a nucleus. tr…
True
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1.16-chem review electrons have low to no mass. true false
True
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saliva ph=7 acidic neutral basic shampoo ph=7 acidic neutral basic stom…
| Substance | pH Value | Classification | |---------------------|----------|----------------------| | Saliva | 7 | Neutral | | Shampoo | 7 | Neutral | | Stomach Acid | 1 | Acidic …
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introduction: lab #14: ionic and covalent bonds (holiday) atoms form bo…
The dot in the Lewis dot diagram of lithium represents its **valence electron** (specifically, the 1 electron in its outermost (valence) energy level).
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lemon juice ph= acidic neutral basic orange juice ph= acidic neutral ba…
1. Lemon Juice: pH=2, ☑ Acidic 2. Orange Juice: pH=3, ☑ Acidic 3. Tomato Juice: pH=4, ☑ Acidic 4. Milk: pH=6.5, ☑ Acidic (slightly acidic) 5. Milk of Magnesia: pH=10, ☑ Basic 6. O…
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what is the density of the object, reported to two significant figures?…
$1.8\ \frac{\text{g}}{\text{mL}}$
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how many significant figures should the answer be reported with? \\(\\f…
2 significant figures
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how many significant figures are in the measurement 9.1 ml? 9.1 ml has …
2
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identify the ph of each substance. then, classify them as acidic, neutr…
| Substance | pH | Classification | |-----------------|-----|----------------| | Ammonia | 11 | Basic | | Baking Soda | 9 | Basic | | Bleach | 13 | Basic | | Coffee | 5 | Acidic |…
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how many significant figures are in the measurement 16.400 g? 16.400 ha…
5
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frequency and he found that this frequency was mathematically related t…
Yes, there were problems with Mendeleev’s Periodic Table. - **Atomic Mass - based Arrangement Exceptions**: Elements were arranged by atomic mass, but some elements (e.g., telluri…
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elements every element has a unique atomic number which indicates the t…
12 (for Magnesium, neutrons ≈ 12) If the question was different (e.g., identifying the element), the answer would be Magnesium (Mg), atomic number 12. Please clarify the exact que…
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who created the first periodic table of elements? identify the two char…
1. Atomic Mass (from the numbers in parentheses for each element). 2. Chemical Properties (from oxide formulas, e.g., \( R_2O \), \( RO \), \( R_2O_3 \), etc., showing similar rea…
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find argon on the periodic table and provide the number of protons, neu…
18 protons, 18 electrons, 22 neutrons
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the more density an object has, the more likely it is to______ in water…
1. Sink 2. Products
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purpose: to determine the trends of the periodic table relating to atom…
### Data Analysis 1 (Trends Across a Period and Down a Group) #### Across a Period (→) - **Atomic Radius**: As you move from left to right across a period, the atomic radius tends…
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multiple choice question weight, height, skinfold thicknesses, and body…
O anthropometric
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the number of valence electrons an element has determines not only what…
To solve this, we analyze the group behavior of each element: ### Part a: Ca (Calcium) Calcium is in Group 2 (alkaline earth metals). Elements in the same group have similar chemi…
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using the periodic table to identify number of valence electrons and th…
(for Group 1A as an example): - Valence Electrons: 1 - Ion Charge: \( +1 \) (You can follow the same logic for other groups. If you want a specific group's answer, just specify th…
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21. which element is the most reactive in the... a. alkali metals? b. a…
Noble gases have a full valence electron shell (e.g., octet configuration, or 2 electrons for He). This stable electron arrangement means they do not need to gain, lose, or share …
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limiting reactant - regular problem 9.23 for each of the following reac…
$\text{O}_2$
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problem 9.23 for each of the following reactions, 28.0 g of each reacta…
$31.1\ \text{g}$
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early earth: 1st half - place in the correct order (oldest to youngest.…
Oldest (top) to Youngest (bottom): 1. - molten surface constantly bombarded by asteroids and planetesimals, keeping temperatures so hot that rock remained liquid because the kinet…
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the ideal gas equation is $$pv = nrt$$ where $p$ is pressure, $v$ is vo…
- Convert the pressure to atmospheres (atm) - Convert the volume to liters (L)
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the equation for molarity, m, is where v is volume and n is the number …
6.51 mol (rounded to three significant figures, consistent with the given values)
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you do not need any science knowledge to perform the following calculat…
$2.28$ $\text{g/cm}^3$
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going from a decimal to a percentage as you saw in the previous parts, …
12.8
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name homework unit 8 mixed practice complete each step for all of the f…
### Question 1: Dicarbon hexahydride reacts with oxygen gas to produce carbon dioxide and water #### Step 1: Translate to chemical equation Dicarbon hexahydride is \( \ce{C2H6} \)…
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name: considering the heating systems below are two diagrams showing th…
1. **Same Molecule Traits**: Both use $H_2O$ molecules with identical 30°C average kinetic energy. 2. **Different Molecule Traits**: Groundwater may have dissolved minerals; heate…
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short for chlorofluorocarbons, cfcs are chemical compounds. scientists …
B. cause/effect
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3. which as the larger percent by mass of sulfur, h2so3 or h2s2o8? (0.5…
\(H_2SO_3\) ### Question 4
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hi, maya. when you submit this form, the owner will see your name and e…
$45.05\%$ ### Question 2
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look at the key and four images below. answer the reflection question, …
B. Hot Water (spread-out molecules) / Cold Water (tight, dense molecules)
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identifying rhyme scheme directions 1. read the following poems. 2. for…
### Rhyme Scheme (line by line): Mary had a little lamb: A Her fleece was white as snow: B And everywhere that Mary went: C The lamb was sure to go: D It followed her to school on…
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today i had a rotten day today i had a rotten day. as i was coming in f…
AABB
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my penmanship is pretty bad my penmanship is pretty bad. my printings p…
ABAB
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all my great excuses i started on my homework but my pen ran out of ink…
ABAB
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express your answer in kilograms per cubic meter. view available hint(s…
$5.23 \times 10^{3}$
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mr. brown the circus clown mr. brown, the circus clown puts his clothes…
AABB
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name unit 8 mixed practice complete each step for all of the following …
### Question 1: Dicarbon hexahydride reacts with oxygen gas to produce carbon dioxide and water #### Step 1: Translate to chemical equation Dicarbon hexahydride is \( C_2H_6 \), o…
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rhyme scheme directions 1. read the following poems. 2. for each poem, …
Line 1: A Line 2: B Line 3: A Line 4: B Rhyme scheme: ABAB
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my cat #2 my cat is nice. my cat is fat. my cat likes mi i like my cat.…
Rhyme scheme: AB CB
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rhyme scheme directions 1. read the following poems. 2. for each poem, …
- My Cat #1 Rhyme Scheme: AABB - My Cat #2 Rhyme Scheme: AB CB
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rhyme scheme directions 1. read the following poems. 2. for each poem, …
### My Cat #1 - My cat is nice.: A - My cat likes mice.: A - My cat is fat.: B - I like my cat.: B - Rhyme scheme: AABB ### My Cat #2 - My cat is nice.: A - My cat is fat.: B - My…
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in this experiment, you will first change the temperature of the water …
How do water temperature and antacid tablet size affect the time required for an antacid tablet to dissolve?
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any molecules with a ph from 7 to 14
Bases (or alkaline substances)
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the only molecule that has a ph of 7
Water (H₂O)
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only approved chemicals may be present at whataburger locations. solo l…
A. True Verdadero
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the whataburger hazard communication program binder contains a complete…
B. Chemicals Químicos
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determine the hybridization of the nitrogen atom and oxygen atom in ace…
1. N ($sp^3$); O ($sp^2$) 2. A line-angle structure with: a 5-carbon chain, a double bond between the first and second carbons, and three methyl branches attached to the fifth car…
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question 18 mark this question if you place an object on a balance and …
1
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question 17 butter melting is an example of a(n) ______ change. physica…
physical
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question 13 when an atom absorbs energy, it will likely enter into a(n)…
excited electronic state
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question 12 what is the correct name for cocl₂·6h₂o? ○ cobalt(ii) chlor…
cobalt(II) chloride hexahydrate
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question 11 which of the following is a metalloid? si p zn la
A. Si
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model a (a chemical structure diagram of methane) and model b (a 3d mol…
D. The angles at which atoms are arranged in the molecule
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2. look at the two models shown below. each represents a molecule of me…
D. The angles at which atoms are arranged in the molecule
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question 7 the chemical formula for nitrosyl fluoride is nof. in the le…
1
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question 6 mark this question which of these is more likely to be a gas…
C. $\text{SO}_2$
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question 5 mark this question which of the following is nonpolar and ha…
BeH₂
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17 drag and drop the words with the descriptions. the smallest unit of …
the smallest unit of an element that maintains all of the chemical properties of that element: atom an element that gains or loses an electron: ion an element that has a different…
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14. choose all that apply. which five postulates were proposed by dalto…
All atoms of a given element are identical. They have the same mass. However, atoms differ from other atoms in different elements by size, mass, and chemical properties. All matte…
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if reaction starts with 20g of reactants it should produce a total of 3…
B. a total of 20g of products (assuming the options are labeled A, B, C, D with B being "a total of 20g of products")
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the reaction below is an example of? $ce{agno_{3} + nacl = agcl + nano_…
B. Double Replacement
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oxidation- rocks that contain iron react with oxygen and form rust dest…
destructive (chemical weathering)
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fe + h₂so₄ --> fe₂(so₄)₃ + h₂; decomposition; synthesis (combination); …
Single replacement
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moss, lichens, and fungi create acid that breaks down rocks; constructi…
Destructive (chemical weathering)
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pb(no₃)₂ --> pbo + no₂ + o₂; single replacement; synthesis (combination…
Decomposition
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ch₄ + 2o₂ —— co₂ + 2h₂o which type of reaction is shown? combustion syn…
A. combustion
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which law states that matter cannot be created or destroyed, only rearr…
B. the law of conservation of mass
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the picture shows which type of reaction? options: combustion, single r…
D. synthesis
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which of the following general formulas represents a single - replaceme…
A. \(A + BC = AC + B\)
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5. how would you modify the procedure if another unknown ion was presen…
To modify the procedure for an additional unknown ion: 1. Determine the new ion’s chemical properties (charge, solubility, reactivity). 2. Select reagents that selectively react w…
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how many hydrogen (h) atoms are in nh₄os
The option with "4" (assuming the options are labeled, e.g., if the second purple box is labeled B, then B. 4)
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jin bought a heat pack that weighs 15 g. he shook it so it would releas…
15 g (corresponding to the option with "15 g")
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how many water molecules are in 5.2 moles of water? 5.2 3.1 × 10²⁴ 8.63…
\( 3.1 \times 10^{24} \) (corresponding to the option: 3.1 × 10²⁴)
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what type of reaction shows a substance breaking down into two or more …
decomposition
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which statement is not evidence that a new substance has formed during …
Substance melts
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ch₄ + o₂ → co₂ + h₂o balance and determine the coefficients 1, 2, 1, 2;…
1, 2, 1, 2 (corresponding to $CH_4$, $O_2$, $CO_2$, $H_2O$)
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what type of reaction has carbon dioxide and water as the products? com…
A. combustion
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what is the part of a chemical equation called? --> 2h₂o chemical equat…
C. Products
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a precipitate is a (select two) an aqueous solution a sign of a physica…
C. solid forming from two aqueous solutions, D. a sign of a chemical change
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n₂ + h₂ → nh₃ the equation is balanced... false true
False
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which represents a balanced chemical equation?\ $\\ce{co_{2} + 2h_{2}o …
B. $\boldsymbol{CH_4 + 2O_2 ightarrow CO_2 + 2H_2O}$
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fe₂o₃ + c → fe + co₂ balance the equation and determine the coefficient…
2, 3, 4, 2 (the third option: 2, 3, 4, 2)
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how many oxygen (o) atoms are in $2c_2ho_8cl_2$ options: 16, 8, 2, 5
16
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what is the definition for avogadros number? number of grams per one mo…
B. \(6.02\times10^{23}\) particles per one mole of a substance (assuming the blue option is labeled B; adjust the label as per the original question's numbering if different)
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20/40 which would have more atoms? 1 mole of si 1 mole of au 1 mole of …
None, all are equal
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6. which of the following best illustrates the concept of the tragedy o…
D. Depletion of an aquifer by regional farmers ### Question 7
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part c thinking /10 create a procedure to carry out your experimental d…
### Procedure to Identify Substances (BaCl₂, Mg(NO₃)₂, K₂SO₄) #### 1. Experimental Design Rationale Use **chemical precipitation reactions** (based on solubility rules and ionic i…
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read the passage. the pet food industry you have just adopted a pet, an…
The first option: "These officials run tests on food to make sure it meets its Guaranteed Analysis, the label on food that lists its ingredients and the proportion of each. Howeve…
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the pet food industry you have just adopted a pet, and youre at a pet s…
It suggests a skeptical tone by questioning the reliability of information provided to consumers by pet food companies.
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13. if protons and neutrons have the same mass, what is the approximate…
The approximate mass of a proton and a neutron is 1 amu. ### Question 14
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based on the effective nuclear charge for the atoms shown in the slide,…
# Brief Explanations: Beryllium, magnesium, and calcium are in Group 2 of the periodic table. All have 2 valence electrons, and their effective nuclear charge for valence electron…
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solutions. write balanced equations to support your predictions. organi…
To solve this, we analyze each reaction using solubility rules: ### For \( \boldsymbol{BaCl_2} \) tests: 1. \( \boldsymbol{BaCl_2 + Na_2CO_3 ightarrow} \) - Products: \( BaCO_3 \)…