化学
化学反応、化学量論、分子構造、元素の性質。
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match the following changes to a neutral atom and the effect that it wo…
Reducing the number of electrons: Creates a cation Increasing the number of electrons: Creates an anion Changing the number of protons: Changes the type of element Changing the nu…
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question 24 1 pts what neutral atom has the same number of electrons as…
C. Ar
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question 25 1 pts which species have the same number of electrons as th…
Ca²⁺, P³⁻, Cl⁻, K⁺, S²⁻
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question 17 1 pts what is the ion that results from the following proce…
Question 17: C. $\ce{N^{3 - }}$ Question 18: D. $\ce{Ca^{2+}}$
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how many protons, electrons, and neutrons, respectively, does ⁸⁹sr²⁺ ha…
First question: A. 38, 36, 51 Second question: A. cations, anions
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how many neutrons are in the following isotope of bromine: $_{35}^{79}b…
For the first question: C. 44 For the second question: B. O
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carbon-12, carbon-13 and carbon-14 are all ______________ of carbon. is…
1. A. isotopes 2. B. neutrons
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how many neutrons are present in a bromine atom with a mass number of 8…
For the first question: D. 46 For the second question: C. 12 amu
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an atom that has 54 protons, 54 electrons, and 78 neutrons is _. \\( _{…
First question: B. $\ce{^{132}_{54}Xe}$ Second question: D. 35
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question 6 1 pts a certain isotope x²⁺ contains 48 electrons and 75 neu…
125
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what is the element x given the following: _{12}^{24}x^{2 +} helium sod…
1. Magnesium 2. Nitrogen
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question (start on a new page) the following graph shows a potential en…
1. The forward reaction is exothermic. 2. $\Delta H =$ (Potential energy of products) - (Potential energy of reactants) and is negative for the forward reaction. 3. The activation…
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10. (a) state any three 1. uses of herbs in a community, 2. disadvantag…
(a) 1. Medicinal, culinary, natural pesticides. 2. Allergic reactions, variable potency, potential toxicity. (b)(i) 1. Distillation 2. Condenser (b)(ii) Cools vapor to liquid. (b)…
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21. for the masses and volumes indicated, calculate the density to gram…
a. $\approx1.55\ g/cm^{3}$ b. $\approx0.51\ g/cm^{3}$ c. $1.01\ g/cm^{3}$ d. $\approx0.09\ g/cm^{3}$
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20. the element bromine (br) at room temperature is a liquid with a den…
The mass of 125 mL of bromine is 390 g. The volume that 85.0 g of bromine occupies is approximately 27.24 mL.
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9. (a) table 9.1 shows different types of alloys, their composition and…
1. Alloys have better properties like strength and corrosion resistance. 2. It has an attractive look, is durable and can be cast well. 3. It is rust - resistant, durable and easy…
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39. ab + cd → ad + be is this a legitimate example of an exchange react…
No, because in a proper exchange (double - displacement) reaction, the products should be in the form of AB + CD → AD + CB, not AD + BE. ### 40.
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38 could two atoms of oxygen engage in ionic bonding? why or why not?
No, because ionic bonding requires a metal and a non - metal for electron transfer, and oxygen is a non - metal. Two oxygen atoms would form a covalent bond by sharing electrons.
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critical thinking questions 33. the most abundant elements in the foods…
These elements are useful because oxygen is essential for cellular respiration to release energy, carbon is the backbone of organic compounds like carbohydrates, lipids, proteins,…
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23. a substance dissociates into k⁺ and cl⁻ in solution. the substance …
23. c. salt 24. b. Ty’s blood is slightly alkaline. 25. c. hexose monosaccharide 26. a. glucose
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16. ab → a + b is a general notation for a(n) __________ reaction. a. a…
16. c. decomposition 17. d. Catabolic, exergonic, and decomposition 18. a. hydrogen and hydrogen 19. d. saliva contains enzymes
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d. activation energy 15. the bonding of calcium, phosphorus, and other …
B. synthesis
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13. which of the following statements about chemical bonds is true? a. …
None of the above options are true.
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13. which of the following statements about chemical bonds is true? a. …
13. None of the above 14. a. potential energy 20. b. organic 21. a. sodium ions and chloride ions 22. d. suspension
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6. a distinctive property is its number of a. protons b. neutrons c. el…
1. a. protons 2. c. more than 80 neutrons each
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4. together, just four elements make up more than 95 percent of the bod…
4. d. oxygen, carbon, hydrogen, and nitrogen 5. b. atom 6. a. protons 9. c. $H_2$ 10. c. polar covalent bonds 11. a. an ion 12. b. salt
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7. (a) (i) name the ore from which iron is obtained. (ii) write a balan…
(a)(i) Hematite (a)(ii) $Fe_2O_3 + 3CO ightarrow 2Fe+3CO_2$ (a)(iii) Limestone decomposes to $CaO$, which reacts with $SiO_2$ (an impurity) to form $CaSiO_3$ (slag). (b) Iron reac…
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36. identify the four components of a negative - feedback loop and expl…
36. Components: stimulus, sensor, control center, effector. Outcome of over - correction: chemical level drops too low. 37. Regulatory processes: shivering, vasoconstriction. 38. …
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reflect think of two substances that arent mentioned on these pages. na…
Substance 1: Wood - Physical property: Density (varies depending on type of wood, can be measured) - Chemical property: Combustibility (burns in the presence of oxygen to form new…
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question 5 (1 point) which graph has the most precise data set?
A.
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question 4 (1 point) what data will you be graphing in this experiment?…
C. x - axis: concentration, y - axis: absorbance
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question 3 (1 point) saved what is/are the unit(s) for absorbance? a) n…
A. No unit
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5. (a) fig. 8.1 shows three electric cells that were used to compare re…
A potential difference is produced when paired with copper, indicating they can displace copper and lose electrons more readily. # (a)(ii)
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question 1 (1 point) in the dilution equation, $c_1v_1 = c_2v_2$, what …
B. Concentration of stock solution
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question sam and amanda moved from hawaii to iowa. their grocery budget…
$100 = $5×Q_1 + $10×Q_2
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4. classify think about different mixtures that are in a kitchen. name …
Homogeneous mixtures: 1. Air in the kitchen - A uniform mixture of gases. 2. Sugar water solution - Sugar uniformly dissolved in water. Heterogeneous mixtures: 1. Bowl of cereal w…
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1 sep interpret data which term or terms can be used to describe this m…
A molecule and a compound
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1. what kind of therapy is biofeedback? holistic biochemical psychosoma…
1. psychosomatic 2. Reflexology
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11) which of these treatments would commonly be labelled \orthodox or c…
11) Chemotherapy 12) Juniper
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3) biofeedback is a type of __________ therapy. holistic biochemical ps…
3) holistic 4) olfactory stimulation
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which multimedia choice would be most effective in persuading blog read…
a video clip featuring the unhealthy ingredients in fast food
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when should you wear safety goggles? * when working with any form of he…
E. All of the above
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when should you wear safety goggles? when working with any form of heat…
# Brief Explanations: Safety goggles protect eyes. Working with heat can cause sparks or splashes, chemicals can splash or emit fumes[SSE onError error]
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multiple select question select all that apply which substances is nitr…
- protein - DNA
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an atomic cation with a charge of +1 has the following electron configu…
What is the chemical symbol for the ion? $Na^{+}$ How many electrons does the ion have? 10 How many 2S electrons are in the ion? 2
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fill in the blank question carbon dioxide and water are substances that…
elements
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multiple choice question the law of conservation of matter states that …
O change form.
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list the s orbitals, if any. are any of them s orbitals? yes no list th…
Are any of them s orbitals? yes List the s orbitals, if any: A Are any of them p orbitals? yes List the p orbitals, if any: B
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are any of them s orbitals? yes no list the s orbitals, if any are any …
Are any of them s orbitals? yes List the s orbitals, if any: D Are any of them p orbitals? yes List the p orbitals, if any: A
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for the acids, use the formula ph = -logh⁺. (because hcl has 1 h⁺ ion p…
0.1 M HCl: 1 0.001 M HCl: 3 0.00001 M HCl: 5 Distilled Water: 7 0.00001 M NaOH: 9 0.001 M NaOH: 11 0.1 M NaOH: 13
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¿qué término se utiliza para describir la cantidad de calor que se requ…
calor de fusión
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un químico quiere calcular la cantidad de calor que absorbe una muestra…
$\Delta H_{fus}$
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¿qué término se utiliza para describir la cantidad de calor que se requ…
calor molar de vaporización
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una muestra de la sustancia con una masa de libera cal al congelarse en…
775.6 cal/mol
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nacl tiene una . ¿cuál es la masa de una muestra de que necesita de cal…
1,417.7 g
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2. sep developing and using models why was organizing the elements into…
# Breve explicación: Durante la época de Mendeleev y Chancourtois, la tabla periódica permitía predecir propiedades de elementos no descubiertos aún basados en la regularidad de l…
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sc2302_mvoa química semestre 6 cambios de entalpía y fase ¿qué herramie…
la tabla periódica
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name vocabulary quiz iatrogenic auscultation acute nosocomial precipita…
1. Palliative 2. Homeostasis 3. Remission 4. Acute 5. Predisposing 6. Nosocomial 7. Prognosis 8. Pathogenesis 9. Exacerbations 10. Symptoms 11. Diagnosis 12. Chronic 13. Disorder …
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aplicación del razonamiento sobre el flujo de calor el calor de vaporiz…
$339.2\ kJ$
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name: dannivah corales vocabulary quiz iatrogenic auscultation acute no…
2. Homeostasis 3. Remission 7. Prognosis 8. Pathogenesis 14. Holistic 15. Precipitating 19. Auscultation 20. Signs
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descripción de los cambios de fase heating curve graph ¿qué procesos po…
condensación, reacción exotérmica, congelación
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1. fill in the following chart. (assume all atoms are electrically neut…
See the filled - in table above.
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model 1 - copper samples group number|volume (cm³)|mass (g)|substance 1…
1. Copper 2. Mass and volume 3. Measure the volume of different - sized copper pieces (using water - displacement or geometric formulas) and then measure their masses using a bala…
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read the poem monets waterllies by robert hayden. today as the news fro…
B. There is no rhyme scheme. C. The lines are unequal in length.
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what are the characteristics of fixed poetry? select three options. a r…
a regular rhyme scheme lines of equal length a set number of lines
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scientists rely on data to describe nature and uncover relationships. t…
1. Copper 2. Mass and volume 3. Measure the mass of copper samples with different volumes at a constant room - temperature of 21.7°C. 4a. Volume; it is deliberately changed. 4b. M…
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in the table below you will find three descriptions of scientists engag…
1. Experiment 2. Hypothesis 3. Hypothesis
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think about the periodic table. what is the science behind its organiza…
# Explicación detallada: ## Paso 1: Respuesta a la pregunta 1 ¿Por qué los elementos en el mismo grupo de la tabla periódica tienen propiedades químicas similares? ## Paso 2: Resp…
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question 25 of 25 what is characteristic of a covalent bond? a. electro…
D. Electrons are shared between two different nuclei.
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question 24 of 25 which molecule has a dipole moment? a. h₂s (bent geom…
A. $H_2S$ (bent geometry)
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question 23 of 25 what is the standard cell notation for an electrolyti…
D. $Al(s)\ |\ Al^{3 + }(aq)\ ||\ Au^{+}(aq)\ |\ Au(s)$
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question 22 of 25 what kind of reaction is symbolized by ab → a + b? a.…
A. Decomposition
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question 21 of 25 what does stoichiometry use to relate moles of one mo…
A. Coefficient ratios
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question 20 of 25 what does the molarity of a solution indicate? a. the…
B. The concentration in moles of a substance in the solution
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question 19 of 25 what is the net ionic equation for the reaction betwe…
B. $SO_4^{2 -}(aq)+Ca^{2 +}(aq) ightarrow CaSO_4(s)$
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question 17 of 25 which element would have properties most like ca (cal…
C. Mg (magnesium)
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question 16 of 25 what are the half - reactions for a galvanic cell wit…
C. $Al(s)\to Al^{3 + }(aq)+3e^-$ and $Au^{ + }(aq)+e^-\to Au(s)$
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1s why is it important to have a final approval step before publishing?…
To ensure the document aligns with organizational or publication standards.
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question 14 of 25 what information does an empirical formula give? a. t…
A. The lowest whole - number ratio of atoms in a molecule
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question 13 of 25 what does the vsepr theory tell about a molecule? a. …
C. The geometry it will have
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question 12 of 25 how are elements arranged on the periodic table? a. b…
C. By increasing atomic number
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question 11 of 25 an avalanche demonstrates what kind of energy convers…
C. Gravitational potential energy to kinetic energy
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question 9 of 25 which of the following is an example of a chemical cha…
A. A solid reacting with a gas to form a new solid
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question 8 of 25 what is a redox reaction? a. a reaction in which the o…
A. A reaction in which the oxidation state of one element increases and another decreases
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question 7 of 25 what periodic trend does the atomic radius follow? a. …
C. It decreases from left to right.
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question 6 of 25 what is the electron configuration for la (lanthanum)?…
B. [Xe]6s²5d¹
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# metal nonmetal formula bonding diagram 1. lithium bromine libr 2. mag…
1. LiBr 2. MgCl₂ 3. Na₂O 4. BeS 5. AlI₃
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question 4 of 25 what is the correct name for n₂o₄? a. nitrogen oxide b…
C. Dinitrogen tetroxide
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question 2 of 25 what property characterizes a spontaneous redox reacti…
C. A positive sum of the two half - reactions' standard potentials
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question 1 of 25 which of the following represents c6h14?
C.
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which piece of text uses this meaning of intrigue? intrigue noun secret…
My favorite author, Sophia Powell, writes spine - tingling novels that are full of mystery and intrigue.
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use the drop - down menus to select the correct structural elements. a …
A group of lines is called a stanza. A sequence of words forms a sentence. A pattern of rhyming words at the end of lines is a rhyme - scheme. Patterns of stressed and unstressed …
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name: q1 chemistry: u1l4 mixture types part 2: summarize the separation…
| Type of Separation | When to Use It | Write a Summary | | --- | --- | --- | | Distillation | Separate liquid - liquid mixtures with different boiling points | Heat mixture, vapo…
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4. how many protons are found in an atom of sulfur - 32? 5. how many el…
4. 16 5. 80 6. Selenium (Se) 7. $^{14}_7N$ 8. $^{92}_{40}Zr$ 9. $^{48}_{23}V$ 10. $^{98}_{42}Mo$
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part 3: multiple choice questions 1. **which separation technique is be…
1. C. Filtration 2. C. Boiling point 3. B. Colored pigments in ink 4. C. Evaporation 5. B. Removing water from cooked pasta 6. C. Density
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part e. complete the following table: assume all atoms are neutral. iso…
| isotope symbol | nuclear symbol | mass number | number of protons | number of neutrons | number of electrons | atomic number | |---|---|---|---|---|---|---| | carbon - 12 | $_{6…
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part e. complete the following table: assume all atoms are neutral. iso…
|isotope symbol|nuclear symbol|mass number|number of protons|number of neutrons|number of electrons|atomic number| |---|---|---|---|---|---|---| |carbon - 12|$^{12}_{6}C$|12|6|6|6…
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gabe amodeo, a nuclear physicist, needs 60 liters of a 60% acid solutio…
40
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gabe amodeo, a nuclear physicist, needs 60 liters of a 60% acid solutio…
20
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2. dé los nombres iupac para los siguientes compuestos: (a) ch3 ch3chch…
# Explicación: ## Paso 1: Identificar la cadena principal Para el compuesto (a) $CH_3CHCH_2CH_2CH_3$ con un grupo metilo en el carbono 2, la cadena principal tiene 5 átomos de car…