化学
化学反応、化学量論、分子構造、元素の性質。
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why does nolka refer to the chemen as grandfather? she misses her grand…
She is trying to trick him into seeing her as a person instead of a meal.
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which block on the periodic table contains the actinide series of eleme…
C. f - block
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in which region of the periodic table do all the elements have two vale…
Region A.
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250 words remaining which region of this periodic table is the f - bloc…
B.
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write the electron configuration of sodium using noble - gas notation. …
\[ [\text{Ne}]3s^{1} \]
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what is the highest occupied sublevel in the structure of an atom of ar…
B) 4p
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how many elements are included in the second row of the periodic table?…
A) 8
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what property of the element does the \15.999\ refer to in the diagram?…
C) atomic mass
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why is argon placed before potassium in the modern periodic table? 250 …
Argon is placed before potassium in the modern periodic table because the modern periodic table is organized based on atomic number. Argon has an atomic number of 18, and potassiu…
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determining ethical actions a reporter is covering a protest at a local…
Minimize harm because the protester might be affected by the interview. Seek truth from another source, because the protester made a statement about a major issue.
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what similarity defines a group of elements on the periodic table? a) e…
A. electron structures
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what did the blank spaces in mendeleevs periodic table represent? a) el…
D. undiscovered elements
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14. mark observes that magnesium reacts vigorously with hydrochloric ac…
1. Reactant particles must collide with sufficient energy (activation energy) and correct orientation. 2. Refrigeration for food preservation (slows down spoilage reactions) and c…
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why is safety training important for handling chemicals at work? (1 poi…
It explains safe ways to handle chemicals.
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what information is on a material safety data sheet (msds)? (1 point) t…
Details about how to safely handle chemicals.
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balance this equation: c₂h₆ + o₂ > co₂ + h₂o
\(2C_{2}H_{6}+7O_{2} ightarrow4CO_{2}+6H_{2}O\)
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6. the maxwell - boltzmann distributions of molecular speeds in samples…
a) Gas A ### Question 7(a)
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1. a 2 l container will hold about 4 g of which of the following gases …
d) \(CO_2\) ### Question 2
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select the correct answers from each drop - down menu. what are the two…
Cones and spheres are examples of Geometric forms, whereas mountains and trees are Organic forms.
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select the correct answers from each drop - down menu. what are the two…
First blank: Geometric; Second blank: Organic
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1 multiple choice 10 points what is a sonnet? a fourteen - line rhyming…
1. A. A fourteen - line rhyming poem 2. They have a rhyme scheme, They are made of an octave and a sestet or three quatrains and a couplet, They are typically in iambic pentameter
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practice: write the formulas calcium carbonate → ca²+ and co₃²- → caco₃…
| Cation | \(Mg^{2+}\) | \(NH_{4}^{+}\) | \(Al^{3+}\) | \(Ca^{2+}\) | \(K^{+}\) | |---|---|---|---|---|---| | Anion | \(PO_{4}^{3 -}\) | \(Cl^{-}\) | \(SO_{4}^{2 -}\) | \(OH^{-}\)…
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2. compare what is the relative amount of potential energy of water mol…
Liquid water molecules have a greater amount of potential energy than water molecules in solid ice.
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quiz 5 review ionic compounds & crystal lattices name: period: date: 1.…
| Ions | Final Formula | Name of Compound | |---|---|---| | \(Ca^{2+}\) and \(F^{-}\) | \(CaF_{2}\) | calcium fluoride | | \(K^{+}\) and \(O^{2 -}\) | \(K_{2}O\) | potassium oxide…
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the chemical trimethylamine n - oxide not only gives fish their fishy s…
B. As a result,
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directions: use the terms below to complete the following paragraphs ab…
1. proton(s) 2. neutron(s) 3. neutron(s) 4. proton(s) 5. number 6. atomic 7. mass 8. proton(s) 9. neutron(s) 10. quarks 11. Electrons 12. Isotopes 13. atomic number 14. proton(s) …
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5.单选题 (10分) 已知h₃po₄的pka₁ = 2.16, pka₂ = 7.21, pka₃ = 12.32。0.20 mol·l⁻¹…
B. 7.21
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question 4 (1 point) a student notices that when he breathes out on a c…
d. Heat leaves the water vapor as it touches the cool window.
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16. scientists believe there may be trillions of other smaller celestia…
mass and orbital path
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how did urbanization affect poor children? led to better jobs for their…
- Primera pregunta: Poverty in poor households forced children to work. No education and few opportunities to escape poverty. - Segunda pregunta: Factories - Tercera pregunta: La …
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which would increase the solubility of the drink powder mix? a cooler t…
C. warmer temperature water
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6. which of the following tests would be a correct way to separate a ce…
A. Use a magnet to separate the metal parts
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which of the following pathological conditions might develop into a ful…
B. transient ischemic attack
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5. how can a saltwater solution be separated into its components? a fil…
C. Evaporation
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4. which statement is true about mixtures? a mixtures cannot be separat…
C. Original components of mixtures retain(keep) their individual properties, and no new chemical bonds are formed
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3. ian has been learning about different kinds of mixtures at school. w…
D. heterogeneous
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8. ian has been learning about different kinds of mixtures at school. w…
A. heterogeneous
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7. how can a saltwater solution be separated into its components? a mag…
C. Evaporation
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8. which statement is true about mixtures? a mixtures are always liquid…
B. Original components of mixtures retain(keep) their individual properties, and no new chemical bonds are formed
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6. which of the following tests would be a correct way to separate a mi…
A. Use a magnet to separate the metal parts.
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4. we learned in class that oil is not soluble in water. what is solubi…
C. The ability of a substance to dissolve in a solvent
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3. kate was drinking grape juice one morning at breakfast. she had been…
D. a homogeneous mixture in which a substance is dissolved in a liquid
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2. true or false: the chemical properties of the starting substances ch…
B. False
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7. which would increase the solubility of the drink powder mix? a. warm…
A. warmer temperature water
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the n = 1 shell of a bohr model can hold a maximum of ______ electrons.…
A. two
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which arrow represents the transition in which dew is formed? 1 2 4 6
4
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14. mark observes that magnesium reacts vigorously with hydrochloric ac…
1. Reactant particles must collide with sufficient energy (activation energy) and correct orientation. 2. Food preservation (e.g., refrigeration slows down spoilage - related reac…
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unit 3: factors affecting the rate of chemical reaction instructions: r…
1. Temperature 2. Surface Area 3. Catalyst 4. Concentration 5. Temperature 6. Nature of Reactant 7. Surface Area 8. Concentration 9. Temperature 10. Catalyst 11. Surface Area 12. …
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methane (ch₄, 16.05 g/mol) reacts with oxygen to form carbon dioxide (c…
\(54.3\%\)
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which best describes the process that arrow 1 represents? molecules are…
Molecules are slowing down during condensing.
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question 1 the lines in a covalent structure are bonds. these bonds con…
shared
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which statement best describes the process that the diagrams show? a so…
C. A solid gains kinetic energy to become a liquid and then becomes a gas.
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what are the main components of air as a gas solution? nitrogen, oxygen…
Nitrogen, oxygen, and carbon dioxide.
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the arrows in the chart below represent phase transitions. which arrows…
4, 5, and 6
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which of the following is a common example of a gas solution? air bronz…
Air
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the diagrams below represent the four states of matter. which diagram r…
Diagram 1
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8/10 what is the most common solvent in liquid solutions? oil acetone a…
Water
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what is an aqueous solution? a solution with alcohol as the solvent a s…
A solution with water as the solvent
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6/10 in a solution, what is the term for the substance that gets dissol…
Solute
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add the correct coefficients to balance the following skeleton equation…
- First equation: \(1H_{2}CO_{3}\to1H_{2}O + 1CO_{2}\) - Second equation: \(1Fe_{3}O_{4}+4H_{2}\to3Fe + 4H_{2}O\)
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1) what is the law of conservation of mass? use a complete sentence. 2)…
1. The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. 2. B. Reactants
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what would earth lack if earth didnt have a liquid outer core? its geom…
Its magnetic field
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part v: problems. solve the following problems. show the given, the for…
The heat lost is approximately \(1.04\times 10^{5}\space J\)
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5/10 what is another term for homogeneous mixtures? compounds solutions…
Solutions
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4/10 which of the following is a solid solution? oil and water air salt…
Bronze
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sound is able to travel faster in response because the molecules are st…
steel, more densely packed
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which of the following is an example of a heterogeneous mixture? chocol…
Chocolate milk
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add the correct coefficients to balance the following skeleton equation…
- \(1H_2CO_3\to1H_2O + 1CO_2\) - \(1Fe_3O_4+4H_2\to3Fe + 4H_2O\)
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practice it form of therapy that combines behavioral and cognitive trea…
cognitive behavioral therapy (CBT)
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practice it form of therapy that combines behavioral and cognitive trea…
cognitive behavioral therapy (CBT)
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abajo se muestran tres isótopos. los círculos rojos representan neutron…
# Explicación breve: El tritio es un isótopo del hidrógeno. El hidrógeno tiene un protón. El tritio tiene 1 protón, 1 electrón y 2 neutrones. Observando las representaciones: - En…
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¿qué isótopo del hidrógeno también se conoce como hidrógeno ordinario? …
Protio, o hidrógeno - 1
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11. homogeneous mixtures are a) evenly distributed b) not evenly distri…
11. a) evenly distributed 12. b) NOT evenly distributed 13. a) homogeneous mixture 14. a) salt water, d) sugar solution 15. b) a homogeneous mixture 16. b) homogeneous mixture 17.…
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lets review... circle the number of all the heterogeneous mixtures 1. r…
4
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question 1 - 2 cowboy life a traditional american cowboy ballad o come …
They create a sympathetic tone.
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question 1 4. what is the amount of moles present in ( 1.27 cdot 10^{29…
\(2.11\times 10^{5}\text{ mol K}\)
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question 2 5. what is the mass in grams of 65 moles strontium? g sr
\(5695.3\)
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part ii: fill - ins. complete the sentence with the best term. 1. the _…
1. freezing point 2. boiling point 3. decantation 4. distillation 5. mass; volume Part III: 1. Compound 2. Element 3. Heterogeneous Mixture 4. Homogeneous Mixture 5. Heterogeneous…
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question 3 6. how many atoms are present in 330 moles of francium? x 10…
\(1.99\times 10^{26}\text{ atoms Fr}\) (rounded to three significant figures)
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question 4 10. how many grams are found in 100 moles of copper? g cu
\(6355\space g\)
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question 5 17. how many atoms are found in 999 moles of neon? x 10 atom…
\(6.02\times 10^{26}\) atoms \(Ne\) (rounded to three significant figures)
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18. how many moles are in 5.49·10²⁵ atoms gold? mol au
\(91.2\)
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anzas is in blank verse? what characteristics suggest that the second o…
B. no rhyme, ten syllables to a line, and pairs of syllables in which the second syllable is stressed
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question 7 13. what is the mass of 8.2·10²⁶ atoms of lithium? g li
\(9452\)
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9. natural sources of calcium area. cheese, yogurt and milkb. peas and …
- 9. A. cheese, yogurt and milk - 10. C. supplements - 11. have withdrawal symptoms, be irritable, be gassy, don't sleep well, cry a lot - 12. C. alcohol - 13. D. Fetal Alcohol Sy…
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question 8 16. how many atoms are in 8.26 grams of magnesium? ×10 atoms…
\(2.05\times 10^{23}\space atoms\)
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completa este cuestionario para finalizar la tarea de quimica ¿cuál de …
Todas las respuestas son correctas.
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completa este cuestionario para finalizar la tarea de química m ántos n…
22
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completa este cuestionario para finalizar la tarea de química mode áles…
Antropogénico
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completa este cuestionario para finalizar la tarea de quimica moderna ¿…
Los isótopos de un mismo elemento tienen el mismo número de neutrones.
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which subatomic particle does the green circle represent?*
neutron
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whats a valence electron? o electrons in the second energy level o elec…
electrons in the outermost energy level
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which element has 15 electrons? neon lithium phosphorus sodium
phosphorus
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what type of energy makes heat transfer by conduction possible? mechani…
kinetic
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el nitrógeno tiene un número atómico de 7 y posee 7 neutrones. ¿cuál es…
14
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particle motion is what type of energy? chemical energy kinetic energy …
kinetic energy
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si conoces el número atómico y la masa deberías poder averiguarlo... el…
todo esto
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completa este cuestionario para finalizar la tarea de química moderna q…
A. Todos estos
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el titanio tiene 22 electrones y 26 neutrones. ¿qué podemos concluir so…
A. todo esto
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bellwork: mass to mole conversion copy the question and answer the foll…
1. Approximately \(0.82\space mol\) 2. Approximately \(2.09\space mol\) 3. Approximately \(1.02\space mol\)