化學
化學反應、化學計量、分子結構與元素性質。
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in a solution the _____ is dissolved. options: solute (yellow button), …
A. solute
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6. please identify each element associated with the orbital notation or…
Beryllium (Be) ### Part (b)
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value: 3 an ion is an atom where the number of electrons is _____ to th…
b. not equal
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rank the glasses from most concentrated to least concentrated. options:…
Glass D, Glass B, Glass A, Glass C
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value: 3 a negatively charged ion is called a ____. ○ a. anion ○ b. cat…
a. anion
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the salt is the ......... options: solute, solution, solvant (note: sol…
A. Solute
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value: 3 the complete transfer of valence electrons between atoms is re…
a. Ionic
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cl⁻: which neutral atom is isoelectronic with cl⁻? how many valence ele…
- The neutral atom isoelectronic with $Cl^-$ is Ar. - A neutral Cl atom has 7 valence electrons.
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value: 3 a positively charged ion is called a ______. a. anion b. catio…
b. cation
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what is agitation? color stirring heating size
B. Stirring
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which neutral atom is isoelectronic with n⁻³? ______________ how many v…
The neutral atom isoelectronic with \(N^{3-}\) is Ne (neon). Neutral \(N\) has 5 valence electrons.
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in a solution the _____ is dissolved. options: solvent (yellow button),…
solute (corresponding to the purple option labeled "solute")
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in an aqueous solution the ________ is water. options: solution, solven…
B. Solvent
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what is the rate of dissolution? options: how cold a substance is, how …
C. how quickly a substance dissolves (assuming the orange option is labeled C; if labels differ, adjust to the option with "how quickly a substance dissolves")
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look at the solution of tea and water. what do you think the terms dilu…
B. Diluted means more water, concentrated means less water
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value: 5 identify the positive ion(s) from the list below. mark all cor…
a. Mercury, b. Aluminum
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look at the text below. if there is an error with subject-verb agreemen…
The number of protons in an atom is expressed by that element's atomic number on the periodic table.
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which of the following medication categories require special handling p…
B. Chemotherapy agents
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which statement best describes how a catalyst can speed up a chemical r…
The catalyst decreases the activation energy needed.
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6 c carbon 12.011 according to the image, the atomic mass of carbon is …
B) By adding the number of protons and the number of neutrons
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fill in the name and empirical formula of each ionic compound that coul…
To solve for the empirical formulas and names of the ionic compounds formed from $\ce{Ca^{2+}}$ and the given anions, we use the criss - cross method (where the magnitude of the c…
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fill in the name and empirical formula of each ionic compound that coul…
| cation | anion | empirical formula | name of compound | | ---- | ---- | ---- | ---- | | $\ce{Ca^{2+}}$ | $\ce{P^{3-}}$ | $\ce{Ca_{3}P_{2}}$ | calcium phosphide | | $\ce{Ca^{2+}}…
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which is the best definition of activation energy? ○ the energy require…
the energy required to form or break the bonds of reactant molecules
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4. write the electron configuration, for mn and mn⁴⁺. how many electron…
s: - Mn electron configuration: $[Ar] 4s^2 3d^5$ (or $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^5$) - $Mn^{4+}$ electron configuration: $[Ar] 3d^3$ (or $1s^2 2s^2 2p^6 3s^2 3p^6 3d^3$) - N…
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fill in the name and empirical formula of each ionic compound that coul…
To solve for the empirical formulas and names of the ionic compounds formed from \( \text{Ba}^{2+} \) and the given anions, we use the criss - cross method (where the magnitude of…
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multiple choice 1 point according to the ph range which substance is mo…
hydrochloric acid
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drag and drop the words or phrases that accurately complete the scenari…
To solve this, we analyze each investigation: ### Investigation #1 - **Type**: Descriptive (since it's observing what happens, no comparison or variable manipulation). - **Limitat…
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it takes 242. kj/mol to break a chlorine-chlorine single bond. calculat…
\(495\)
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a researcher is designing a laboratory experiment to determine whether …
B. First, he should measure how long it takes for the liquid to become clear if X and Y are mixed together. Then, he should measure how long it takes if he also adds substance A t…
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8. which example represents a physical change? a. water evaporating b. …
A. Water evaporating ### Question 9
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practice it! sally is a chemist who read an article about how 40% of th…
comparative
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homework 1.4 due in bin directions: read each question carefully and an…
b. Physical change ### Question 2
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the amount of energy that must be absorbed or lost to raise or lower th…
F. is 1 calorie
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fill in the name and empirical formula of each ionic compound that coul…
| cation | anion | empirical formula | name of compound | | ---- | ---- | ---- | ---- | | \( \text{Cs}^+ \) | \( \text{I}^- \) | \( \text{CsI} \) | cesium iodide | | \( \text{Cs}^…
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which would not increase the rate of dissolution? ice agitation heat sm…
A. Ice
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atoms, ions and molecules naming binary ionic compounds fill in the nam…
The table follows the pattern of binary ionic compound formation: cation ($K^+$) + anion (halide, -1 charge) → empirical formula (1:1 ratio) and name "potassium [halide -ide]". Fo…
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unsaturated solution, saturated solution, supersaturated solution (disp…
B. Solute
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which of the following actions increases the concentration of an aqueou…
B. increasing the amount of the solute (tea)
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3. write the electron configuration, for sr and sr⁺². how many electron…
Sr: $\boldsymbol{1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^6 5s^2}$ (or $\boldsymbol{[Kr] 5s^2}$) $Sr^{2+}$: $\boldsymbol{1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^6}$ (or $\boldsym…
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look at the text below. if there is an error with subject - verb agreem…
"I would rather buy free - range, organic chicken," Antonio admitted to the clerk at All Natural Grocer, "but six dollars per pound is more money than I can afford!"
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look at the text below. if there is an error with subject - verb agreem…
To solve this, we check for misspelled words. Let's go through each word: - "raither" is misspelled. The correct word is "rather". - "carign" is misspelled. The correct word is "c…
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instructions review the following diagrams below carefully. you will be…
To solve this, we analyze each diagram based on the definitions: - **Element**: Only one type of atom (single or bonded, but same atom). - **Compound**: Molecules with two or more…
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chemistry 20: bonding unit. molecular shapes. choose model\ molecule sh…
### For $\ce{NH_{3}}$: #### Lewis Dot Diagram: - Nitrogen ($\ce{N}$) has 5 valence electrons, and each hydrogen ($\ce{H}$) has 1. - $\ce{N}$ forms 3 single bonds with 3 $\ce{H}$ a…
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2. draw a diagram of a correct bunsen burner flame and label the hottes…
The Bunsen burner flame (with open air hole) has an inner blue cone (unburnt gas - air mixture) and an outer cone (complete combustion). The hottest spot is at the tip of the inne…
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iron has a density of 7.86 g/cm³. calculate the volume (in dl) of a pie…
\(4.31\)
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looking for patterns in household objects/chemicals object/chemical | o…
To solve the task of identifying patterns and listing observations, we analyze each object/chemical: ### Step 1: Recall Definitions - **Element**: Pure substance with one type of …
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decide whether each pair of elements in the table below will form an io…
To solve this, we analyze each pair of elements: ### 1. Oxygen (O) and Chlorine (Cl) - **Step 1: Check Ionic Compound Formation** Ionic compounds form between metals and nonmetals…
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how does solid rock become soil? it falls apart and combines with parti…
The correct option is: It breaks down and combines with water, air, and organic matter.
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which type of weathering is caused by plants? ○ chemical weathering ○ m…
both mechanical and chemical weathering
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1 kg / 1000 g 1000 mg / 1 g 1 mg / 1000 µg 1000 µg / 1 mg 1000 g / 1 kg…
### Part A (Filling the Conversion Factor Table) #### 1. 500 g of medication A in terms of mg ## Step1: Identify the conversion factor We know that to convert grams (g) to milligr…
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which factor influences both chemical weathering and mechanical weather…
plants
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17. why is water such a good solvent?
Water is a polar molecule with a partial positive charge on hydrogen and partial negative on oxygen, can form hydrogen bonds, and its polarity/intermolecular forces interact with …
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15. in a cup of tea, what is the solvent? what is the solute?
- Solvent: Water (the liquid in the tea that dissolves other substances). - Solute: Compounds from tea leaves (and any added substances like sugar, etc.) that are dissolved in wat…
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which statement best describes how a catalyst can speed up a chemical r…
The catalyst decreases the activation energy needed.
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describing catalyst function what happens to the rate of a chemical rea…
It speeds up.
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how do catalysts function in a chemical reaction? they lower the amount…
The correct option is the one with the statement: "They lower the amount of energy required for the reaction to begin." (Assuming this is, for example, the top - right option amon…
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question 19 of 22 > attempt 3 correct bonding incorrect bonding
The incorrect bonding is the structure with a carbon atom bonded to four hydrogen atoms (the right - most square - shaped structure).
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how many single covalent bonds does each element generally form? enter …
carbon: 4 hydrogen: 1
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q1 chemistry: u2l2 the atomic symbol date: ______ prepwork part 1: the …
To solve these chemistry problems, we'll analyze each question step by step: ### Question 1 (Table Completion - Row 1) - **Step 1: Atomic Number and Identity** Atomic number = num…
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the diagram below is a model of two solutions. each blue ball represent…
Solution B
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question 17 of 22 ionic (cyan circle) and covalent (pink circle) venn d…
To solve this Venn diagram problem about ionic and covalent bonds, we analyze each statement: ### Ionic (Only) - **form between oppositely charged ions**: Ionic bonds are between …
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the diagram below is a model of two solutions. each green ball represen…
Solution A
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6) a correlation shows the relationships between two or more factors. ○…
True ### Question 7
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question 16 of 22. organic, inorganic. answer bank: methane (structure:…
- Organic: Methane, Acetic Acid - Inorganic: Oxygen, Phosphate
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the diagram below is a model of two solutions. each purple ball represe…
# Explanation: ## Step1: Count solute particles in A Solution A has 5 purple particles. ## Step2: Count solute particles in B Solution B has 5 purple particles? Wait, no, wait. Wa…
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which statement about organic compounds is true? a compound found withi…
D. An organic compound typically has at least one carbon–hydrogen or carbon–carbon bond.
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name: ______ teacher: ______ date: ______ q1 chemistry: u2l2 the atomic…
All isotopes of an element have the same number of protons (atomic number), the same number of electrons (in neutral atoms), and the same chemical properties. #### 2. What differe…
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which of the statements describe hydrogen bonding between water molecul…
- The slightly negative oxygen atom of one water molecule is attracted to the slightly positive hydrogen atom of another water molecule. - A water molecule is polar because it has…
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2. list at least two appropriate items for the student on the right. 3.…
- Lab coat (protects clothing from chemical spills and stains) - Safety goggles (protects eyes from chemical splashes or broken glassware) ### Question 3
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the diagram below is a model of two solutions. each pink ball represent…
Solution B
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q1 chemistry: u2l2 the atomic symbol date: prepwork part 1: the atomic …
### Question 1 (Table Completion) #### Step 1: Analyze the first row (Q#1) - **# of protons** = 16, so **Atomic #** = 16 (since atomic number = number of protons). The element wit…
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question 11 of 22 polar bonds nonpolar bonds answer bank the bond betwe…
### Polar bonds: - electrons are not equally shared by the atoms in a covalent bond - one atom of a covalent bond has higher electronegativity than the other atom in the bond - th…
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which of the phrases describe a chemical bond? select all that apply. ☐…
- sharing of electrons between atoms - interaction between ions with opposite charges
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q1 chemistry: u2l2 the atomic symbol date: prepwork part 1: the atomic …
### Question[SSE Completed, Client Connection Error][SSE Completed, Client Connection Error][LLM SSE On Failure]
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how many protons does an ion with 10 electrons and a charge of +1 conta…
11
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what is the difference between an anion and a cation? ○ an anion has a …
D. an anion has a negative charge whereas a cation has a positive charge (assuming the last option is labeled D; if the options are labeled differently, adjust the label according…
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why do atoms form molecules? ○ to achieve a stable number of neutrons ○…
D. to achieve a stable number of electrons (assuming the last option is D; if options are labeled differently, adjust the label but keep the text: "to achieve a stable number of e…
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question 5 of 22 hin atoms, there is an ongoing relationship between th…
### Nucleus: - attracts the negatively charged particles into the space surrounding it - positively charged ### Electrons: - negatively charged - can move from one atom to another…
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why are noble gases, such as argon, chemically inert? ○ noble gases hav…
D. Noble gases have a full outer electron shell. (Note: Assuming the options are labeled A, B, C, D in order. If the original options had different labels, adjust accordingly. Her…
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question 3 of 22 consider the image of oxygen. how many electrons are i…
2, 6 (the option with "2, 6")
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chemistry: u2l2 the atomic symbol date: prepwork prepwork part 1: the a…
c ### Question 5
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5. why should one avoid wearing shorts or skirts while working with che…
One should avoid wearing shorts or skirts because they expose the legs, leaving them vulnerable to chemical spills (which can cause burns or chemical absorption) and injuries from…
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sort the samples based on the type of substance their arrangement repre…
### Mixture(s): - Sample X - Sample Z ### Compound(s): - Sample Y - Sample U (Note: If the task was to drag and drop, the mixtures are X and Z; compounds are Y and U.)
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which of the properties is the unique, defining property of atoms of a …
B. atomic number
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question 3 1 pts a single carbon atom can have a maximum of how many bo…
4. The option corresponding to 4 (the last option in the list: 4)
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$0.93 \\frac{\\text{g}}{\\text{ml}} \\times 3.725 \\text{ ml} = \\squar…
$3.46425$ (or rounded to $3.46$ or $3.5$ depending on significant figures, but the direct calculation is $3.46425$)
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$0.93\\ \\frac{\\text{mol}}{\\text{l}}\\ \\times\\ 0.85\\ \\text{l}\\ =…
\(0.7905\)
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992.1 mol ÷ 0.56 l = □ (mol/l)
\( 1771.61 \) (or more precise value depending on calculation method, e.g., \( \frac{99210}{56}=\frac{49605}{28}\approx1771.61 \))
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7.your teacher asks your group to create a list of ten rules that every…
(List of 10 Lab Rules): 1. Wear appropriate lab attire (lab coat, goggles) at all times. 2. Follow the instructor's directions precisely. 3. No eating, drinking, or chewing gum in…
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5 multiple choice 9 points a student receives a beaker that contains sa…
B. The beaker originally contains a heterogeneous mixture, and after Step 1, it contains a homogenous mixture. (Assuming the second option is labeled B; adjust label based on orig…
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which best defines the term matter? ○ anything that takes up space and …
A. anything that takes up space and has mass
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7 multiple choice 6 points the diagram depicts the atomic arrangement o…
Substance 1: mixture; Substance 2: compound (matching the option "Substance 1: mixture, Substance 2: compound" from the choices)
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select all that apply which are measurements of volume in the si system…
A. $18.055\ L$, B. $45\ cm^3$, C. $22.4\ \mu L$
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multiple choice 9 points salt molecules and water molecules are represe…
Sample X
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multiple choice question convert 23.54 l to ml. ○ 0.00002354 ml ○ 23,54…
B. 23,540 mL (assuming the second option is labeled B, if the original options had labels like A, B, C, D with the second option being B. If the labels were different, adjust acco…
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which particle diagram can be classified as a mixture? diagrams: x (whi…
Sample X
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2. stem the diagram shows the structure of a molecule of sulfur dioxide…
12
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14) capsaicin is a phytochemical that is commonly found in: ○ tomatoes …
B. Chili peppers ### Question 15
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11) the most prevalent nutrient in most food groups is: ○ carbohydrates…
Water ### Question 12
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a chemist working as a safety inspector finds an unmarked bottle in a l…
Density: \(\approx1.0\space g\cdot mL^{-1}\) (or \(1.02\) depending on sig figs), possible to identify: yes, liquid: ethanolamine