化学
化学反应、化学计量、分子结构与元素性质。
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73 of 74 concepts completed assignment is past due fill in the blank qu…
phase diagram
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complete the sentence with the correct comparative or superlative adver…
worst
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the added sugar content in a serving of this cereal is minimal (< 1g). …
Apple juice concentrate
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a popular breakfast cereal has a claim on the front panel of the box, w…
d. nutrient claim
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exercise 1. state the three main type of salt and example each 2. state…
1. Acidic Salt - Example: $\ce{NaHSO4}$ 2. Basic Salt - Example: $\ce{Ca(OH)Cl}$ 3. Neutral Salt - Example: $\ce{NaCl}$ ### Sub - Question 2: State any 4 properties of salt
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which statement best describes the rhyme scheme in \a psalm of life\? t…
D. Each stanza adheres to its own rhyme scheme (ABAB, CDCD, EFEF, etc.).
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which statement best describes the rhyme scheme of \a thought on the in…
There are two stanzas with the rhyme scheme ABCB throughout.
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which statement best describes the rhyme schemes of \the author to her …
Bradstreet uses couplets for their overall rhyme scheme and structure; Wheatley uses couplets to enhance the poem as a song of praise for creation.
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match the type of intermolecular force with the description of where it…
To solve this, we analyze each intermolecular force: ### Dipole - Dipole Forces These act between polar molecules (molecules with permanent dipoles, i.e., partial positive and par…
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question 13 1 point which otc product is used to provide temporary reli…
1. B. Cough suppressant 2. B. Aspirin
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5. convert 2.50 x 10⁷ ng into cg. 6. convert 9.7 x 10⁻⁶ kj into mj. 7. …
5. $2.50 \times 10^2\ \text{cg}$ 6. $9.7\ \text{mJ}$ 7. $\approx 8.28\ \text{kL}$ (rounded to 3 significant figures) 8. $\approx 0.20\ \text{km}$ (rounded to 2 significant figures…
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if 14.0 grams of co₂ are removed from the lunar module air, how many mo…
\( 1.91 \times 10^{23} \) molecules (Option: 1.91 x 10^23 molecules)
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ground control reports that 38.5 grams of lioh have been used in the sc…
59.48 grams
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environmental sensors detect 3.42 grams of h₂o inside the lunar module.…
\(0.380\) Moles
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label the following diagram with the correct phase changes. drag the la…
- Water → Vapor (up): Evaporation - Vapor → Water (down): Condensation - Water → Ice (down): Freezing - Ice → Water (up): Melting - Ice → Vapor (left curve): Sublimation - Vapor →…
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which of the following changes in state require energy to occur? which …
- Energy is required: Melting, Evaporation, Sublimation - Energy is released: Freezing, Condensation, Deposition
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ground control predicts that 0.426 moles of co₂ will accumulate in the …
20.41 grams (Option: 20.41 grams)
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when the explosion occurred, the o₂ tank lost 145,000 g of o₂ and power…
4530 Moles (the option: 4530 Moles)
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multiple choice question which group of elements commonly forms ions th…
Be, Mg, Ca, Sr, Ba
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multiple select question select all that apply which statements describ…
- The sum of the oxidation number of each ion multiplied by the number of ions in a formula unit must equal zero. - If no subscript is written, it is assumed to be one. - Subscrip…
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multiple choice question what term describes a one - atom ion, such as …
A. monatomic ion
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fill in the blank question the chemical formula for an ionic compound, …
empirical formula
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multiple choice question for an element in an ionic compound, the numbe…
A. oxidation
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multiple select question select all that apply which statements about f…
- The overall charge of a formula unit is zero. - The chemical formula for an ionic compound represents a formula unit. - The formula unit represents the simplest ratio of the ion…
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multiple choice question most transition metals and group 13 and 14 met…
more than one possible ionic charge
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fill in the blank question a one - atom ion is called a(n) □ ion.
monatomic
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multiple choice question what is the term for the chemical formula for …
a formula unit
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fill in the blank question a formula unit represents the simplest of th…
ratio
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wilhelm conrad roentgen discovered x - ray by: observing an x - ray pro…
A. observing as X - ray produced with high voltage (assuming the first option is A, adjust the identifier based on actual numbering) ### Question 2 (Thomas Edison contributed grea…
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1. isotopes are often named using hyphen notation, which tells us the e…
Hyphen notation (e.g., Element - MassNumber) is useful for representing isotopes because it clearly provides the element name (defining the number of protons) and the mass number …
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1. isotopes are often named using hyphen notation, which tells us the e…
Hyphen notation (e.g., Element - MassNumber) is useful for isotopes as it directly provides the element name and its mass number. Isotopes of an element have the same atomic numbe…
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section 5: journey to pyramids & the treasure word search! abrade besee…
Paulo Coelho sends Santiago to Egypt and has the treasure in Spain to highlight that the journey (with its lessons, self - discovery, and growth) is the true treasure. The physica…
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each case, she fills a reaction vessel with some mixture of the reactan…
### First Reaction: \( \boldsymbol{2\text{Al}(s) + 3\text{H}_2\text{O}(g) ightarrow \text{Al}_2\text{O}_3(s) + 3\text{H}_2(g)} \) #### Step 1: Convert temperature to Kelvin The te…
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each case, he fills a reaction vessel with some mixture of the reactant…
For the first reaction (\( \text{PbSO}_4(s) + 4\text{H}_2\text{O}(l) ightarrow 4\text{H}_2\text{O}_2(l) + \text{PbS}(s) \)): - \( \Delta G = \boxed{22} \, \text{kJ} \) - Spontanei…
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levi adds 26 grams of lead(ii) nitrate (pb(no₃)₂) into 25 grams of wate…
6 grams
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lola adds 29 grams of sodium nitrate (nano₃) into 25 grams of water (h₂…
4 grams
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what is the best description of argentinas dirty war that lasted from 1…
D. a period of repression and human rights abuses committed by military rulers
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in the formation of a black hole, which step happens before stars emit …
C. A chemical reaction begins to take place
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using the appropriate bond energies, calculate the heat of reaction \\(…
$-806\ \frac{\text{kJ}}{\text{mol}}$
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \( \ce{2 F2(g) + O2(g) → 2 OF2(g)} \)
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fill in the missing information: | symbol | atom or ion? check all that…
| symbol | atom or ion? (check all that apply) | number of protons | number of electrons | |--------|--------------------------------------|-------------------|-------------------…
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directions: use a periodic table to find the information asked for belo…
### Question 1: Atomic Number #### Step 1: Recall the atomic number (number of protons) from the periodic table. - Calcium (Ca): Atomic number is 20. - Iron (Fe): Atomic number is…
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fill in the information missing from this table. | nuclide | protons | …
# Explanation: ## Step1: Recall definitions (Z=protons, A=protons+neutrons, nuclide symbol: element with Z, A) For a nuclide, \( Z \) (atomic number) = number of protons. \( A \) …
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complete the table below. for example, in the first row decide whether …
To solve for the most likely ions, we analyze each element based on its position in the periodic table and typical ion formation: ### Chlorine (Cl) - **Step 1: Determine ion type*…
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the redox reaction given below occurs in a basic solution. \\(\\ce{hpo^…
The number of electrons transferred in the $\ce{HPO_3^{2 - }}$ half - reaction is 2. The balanced half - reaction is $\ce{2e^- + 2H_2O + HPO_3^{2 - } = H_2PO_2^- + 3OH^-}$ (the nu…
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select the correct answer from each drop - down menu. a potassium ion c…
To solve this, we analyze ionic and covalent bonding in potassium compounds: ### For the first drop - down (compound with both ionic and covalent bonds): A compound like $\ce{KNO3…
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57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 la ce pr nd pm sm eu gd tb…
Diatomic Element: hydrogen, iodine, oxygen Monatomic Element: helium, carbon, sodium
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drag each tile to the correct location. classify the elements as diatom…
To solve this, we first recall the definitions: - **Monatomic elements**: Exist as single atoms (most elements, like metals, noble gases, some nonmetals). - **Diatomic elements**:…
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le chateliers principle continued 12.6 kcal + h₂(g) + i₂(g) ⇌ 2hi(g) | …
### First Equilibrium: \( \boldsymbol{12.6 \text{ kcal} + H_2(g) + I_2(g) ightleftharpoons 2HI(g)} \) #### Stress 1: Add \( H_2 \) - **Equilibrium Shift**: Right (given). - **\( […
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4. determine the empirical formula of the indicated compound. (4 points…
A. $\text{P}_2\text{S}_5$ B. $\text{CF}_3$
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Question was provided via image upload.
The empirical formula is $\text{P}_2\text{S}_5$
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ami day: formulas for acids name construct the chemical formula for eac…
1. $\text{H}_2\text{Cr}_2\text{O}_7$ 2. $\text{HCl}$ 3. $\text{HF}$ 4. $\text{HClO}_2$ 5. $\text{H}_3\text{AsO}_4$ 6. $\text{H}_3\text{P}$ 7. $\text{HCN}$ 8. $\text{HIO}_3$ 9. $\t…
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what number do you use to convert moles to liters? moles to atoms? mole…
- Moles to liters (at STP): Use 22.4 L/mol (conversion factor: Volume = Moles × 22.4 L/mol). - Moles to atoms: Use Avogadro's number (\( 6.022\times 10^{23} \) atoms/mol) (convers…
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ami day: nomenclature for acids name correctly name the following acids…
1. Hydrosulfuric acid 2. Chromic acid 3. Hydrofluoric acid 4. Tetraboric acid 5. Hydrophosphoric acid 6. Iodic acid 7. Hydrocyanic acid 8. Perchloric acid 9. Hydroselenic acid 10.…
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each case, he fills a reaction vessel with some mixture of the reactant…
### First Reaction: $\boldsymbol{\ce{CO2(g) + 2H2O(g) -> CH4(g) + 2O2(g)}}$ #### Step 1: Convert temperature to Kelvin The temperature is $74.0^\circ \text{C}$. To convert to Kelv…
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16. an imaginary element named summerium forms the following imaginary …
### Question 16 1. Monatomic ion 2. $\text{H}_2\text{Su}$ 3. Binary acid 4. Hydrosummeric acid ### Question 17 1. Polyatomic ion 2. $\text{H}_3\text{WnO}_4$ 3. Oxyacid 4. Winteric…
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select the correct answer. when a perfume bottle is opened, some liquid…
A. Gases do not have a definite volume.
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4. drew added yeast and sugar to lukewarm water and placed it in a flas…
The mass should be the same since matter is neither created nor destroyed.
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3 an equation for photosynthesis is shown. \\boxed{\\ce{6co_{2} + 6h_{2…
The incorrect statement is "The number of oxygen atoms in the reactants equals the number in the products" (the first option, as marked in the image, assuming the equation had a t…
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14. an imaginary element named studentium forms the following imaginary…
### Question 14: 1. Monatomic ion 2. $\text{H}_2\text{St}$ 3. Binary acid 4. Hydrostudentic acid ### Question 15: 1. Polyatomic ion 2. $\text{H}\text{BsO}_3$ 3. Oxyacid 4. Basketo…
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assignment: reflect on the lab active reflect on the laboratory experim…
- Ionic substances: sodium chloride, sodium bicarbonate - (For the prediction accuracy question, select the option that matches your actual warm-up performance; e.g., if you got 2…
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11. which of the following is the correct chemical formula for arsenic …
b. $\text{H}_3\text{AsO}_4$
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assignment: reflect on the lab active reflect on the laboratory experim…
- sodium chloride - sodium bicarbonate
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9. which of the following is true concerning boric acid? a. boric acid …
b. Boric acid contains hydrogen with the borate oxyanion.
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read the passage from sugar changed the world. no one could have seen i…
B. Advances in the production of sweeteners hastened the end of involuntary servitude.
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7. which of the following substances would be classified as an acid? a.…
7. a. $\text{H}_2\text{C}_4\text{H}_4\text{O}_6$ 8. c. hydrosulfuric acid, a. hydrophosphoric acid (note: option b is incomplete, but the valid binary acids from given options are…
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extra credit name: aluminum antimony argon beryllium boron calcium carb…
This is a word search puzzle related to chemical elements, so the relevant subfield in Natural Science is Chemistry. To solve the word search, we look for each element's name in t…
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calculate the percent composition by mass of zinc in the fictional comp…
\( 49.8\% \)
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calculate the percent composition by mass of calcium in the fictional c…
44.9%
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calculate the percent composition by mass of iodine in the fictional co…
$58.7\%$
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calculate the percent composition by mass of magnesium in the fictional…
\(9.22\%\) (or \(9.21\%\) - slight rounding differences, but typically \(9.22\%\) with 3 sig figs)
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calculate the percent composition by mass of yttrium in the fictional c…
65.0%
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calculate the percent composition by mass of chromium in the fictional …
\( 20.1\% \)
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calculate the percent composition by mass of oxygen in the fictional co…
49.4%
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calculate the percent composition by mass of carbon in the fictional co…
\( 69.2\% \)
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calculate the percent composition by mass of hydrogen in the fictional …
\( 5.89\% \)
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which is an example of a physical change? a candle burning a firework e…
ice cream melting
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separating sand from gravel; physical; chemical
physical
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boiling water; physical; chemical
Physical
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this picture represents which of the following? compound mixture element
mixture
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balancing equation quiz balance the following equations and identify th…
1. $\boldsymbol{1\text{Mg}_3\text{P}_2 ightarrow 3\text{Mg} + 2\text{P}}$ Type: (D) Decomposition 2. $\boldsymbol{1\text{CH}_4 + 2\text{O}_2 ightarrow 1\text{CO}_2 + 2\text{H}_2\t…
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contains two or more atoms combined; mixtures; elements; compounds
Compounds
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which of the following is an element? salt oxygen sugar water
Oxygen
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contains only one kind of atom. mixture element compund
Element
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glucose (c₆h₁₂o₆) is an example of a... mixture element compound
Compound
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classify the picture with the correct label. mixture of elements and co…
C. Mixture of Elements
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which statement best describes the gas in a scuba tank? the gas barely …
The gas is compressed.
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classify the picture with the correct label. compounds; mixture of elem…
B. Mixture of Elements & Compounds
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classify the picture with the correct label. element mixture of compoun…
Compound
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11 multiple choice 1 point ls estudios sociales social media social stu…
B. social studies ### Question 12
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which one shows that a chemical reaction has occurred? melting dissolvi…
formation of a gas
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bike rusting; physical; chemical
Chemical
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examples are diamonds (c) and uranium (u)\ mixtures\ compounds\ elements
elements
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burning leaves chemical physical
chemical
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nahco₃ is an example of — a compound an abbreviation a mixture an eleme…
a compound
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3.07 unit test: gas laws due: fri feb 6, 2026 11:59pm attempt 1 in prog…
There is a rise in temperature.
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11. at antarcticas famous blood falls, bright red water seeps out of th…
Synthesis ### Task 2:
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a bakery has developed a new artisan bread. the staff are giving away t…
- Observe customer reactions while they taste the product. - Measure sales of the new bread after customers have sampled it.
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what does the fda regulate? select all that apply. □ workplace safety □…
- drugs - tobacco products
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2. can oxidation occur without reduction? explain. 3. why would a nail …
No, oxidation cannot occur without reduction. Oxidation is the loss of electrons, and reduction is the gain of electrons. In a redox reaction, electrons lost by one species (durin…