化学
化学反応、化学量論、分子構造、元素の性質。
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1. determine the elements group number and number of valence electrons …
21. Fluorine: 7; Phosphorus: 5; Calcium: 2; Nitrogen: 5; Strontium: 2; Argon: 8; Potassium: 1; Helium: 2; Magnesium: 2; Sulfur: 6; Hydrogen: 1; Aluminum: 3; Barium: 2; Oxygen: 6; …
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1) 2 examples of a substance - 2) 2 examples of mixtures - 3) 3 example…
1. Pure water, gold 2. Salt - water solution, air 3. Elements: oxygen, hydrogen; Compounds: water, carbon - dioxide 4. Muddy water, sand - water mixture 5. Milk, fog 6. Sugar - wa…
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name: bianca date: student exploration: ph analysis: quad color indicat…
1. A. Sour - B. Stinging 2. A. Slippery - B. Bitter - C. Burning/stinging 3. 1. Dark blue - 2. Around 11 - 12; Alkaline
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5. experiment: turn on show electronegativity. electronegativity (en) d…
1. For two non - metals with small (or no) EN difference: The shared electrons are shared equally. 2. For two non - metals with large EN difference: The valence electrons are pull…
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10. factors that increase the speed of chemical reactions include a. in…
A. increasing the temperature, C. increasing the concentration of the reactants, D. catalysts
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5. experiment: turn on show electronegativity. electronegativity (en) d…
For the first question about two non - metals with small (or no) EN difference: The shared electrons are attracted equally by each atom, forming a nonpolar covalent bond. For the …
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mid - term study guide 29 why does earth have a magnetic field? plate t…
29. Earth's magnetic field is generated by the motion of molten iron - nickel in its outer core creating electric currents via the dynamo effect. 30. Under the continents. 31. Und…
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short answer essay 11. why is a study of basic chemistry essential to u…
11. Chemical reactions underlie physiological processes. 12. Energy causes matter to move/change; capacity to do work. 13. Kinetic is energy of motion, potential is stored; can co…
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what is capillary action? the ability to get into small spaces and redu…
When water molecules grabbing at the walls of a vessel, drawing the water upward even against the effects of gravity
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question 1 (1 point) listen how would you prepare a 15% sugar solution?…
5) All of the above
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water resists changing its temperature a high polar and ionic. universa…
specific heat
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part f: interpreting the periodic table use your periodic table to find…
1. 3 2. 24.31 3. Pb 4. +1, +2 5. Calcium 6. Fluorine 7. Xe 8. 183.84 9. Carbon 10. 0
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q1 chemistry: do now: for each multiple - choice question below, use st…
1. c. Na⁺ 2. a. S⁻² and Cl⁻¹ 3. I calculated the number of electrons in each ion/atom based on their atomic numbers and the charge on the ion. 4. They have similar chemical and ph…
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3. experiment: turn off show polar molecule inset and show nonpolar mol…
A. The sodium valence electron is transferred to the chlorine atom. B. Ionic bonds are formed, with electrons completely transferred from the metal to the non - metal. 4. A. Coval…
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name roberto garza jr period 6 110125 naming compound and balancing equ…
# Explicación: ## Paso 1: Balancear la ecuación 2 Comenzamos con $C_3H_8 + O_2 ightarrow CO_2 + H_2O$. Primero, balanceamos los átomos de carbono. Hay 3 átomos de carbono en $C_3H…
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numeric 1 point determine the number of sig figs in the number below: 0…
2
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6. deux ballons de verre identiques ont été remplis à la même températu…
Le premier ballon (avec la diazote) a la pression la plus élevée car le nombre de moles de diazote est supérieur au nombre de moles de dioxyde de carbone dans les conditions de mê…
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39. a substance that has neither a definite shape nor definite volume c…
# Explanation: ## Step1: Recall states of matter properties Solids have definite shape and volume, liquids have definite volume but no definite shape, and gases have neither defin…
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a scientist finds an element and only knows that it is contained in gro…
The element should be handled carefully when exposed to water.
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calculate the density of the red mystery substance. instructions: 1. ma…
Mass = 41.1 g Volume = 25 mL Density = 1.644 g/mL
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what does the word culmination mean in the sentence, the discovery of t…
B. final product
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greenhouse gases include carbon dioxide and methane. how do greenhouse …
B. They trap heat that is radiated from the surface.
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a scientist who wanted to create a different arrangement of the periodi…
new elements have been discovered that show properties different than those predicted by the periodic table.
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activity a: bond polarity get the gizmo ready: • on the bond polarity t…
1A. The electrons are clustered more around the more electronegative atom. 1B. The atom with more electrons has a partial negative charge and the other has a partial positive char…
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39. a substance that has neither a definite shape nor definite volume c…
# Explanation: ## Step1: Recall states of matter properties Solids have definite shape and volume, liquids have definite volume but not definite shape, and gases have neither defi…
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which of these sentences from the text provides an argument that suppor…
Hefferlin’s chart reveals that certain properties of molecules—the distance between atoms and the energy required to ionize the molecule, for instance—occur in regular patterns.
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read about how the periodic table of elements was created and adapted b…
The periodic table of the elements we know today is the result of years of research by many different scientists. So the answer is: Years of research by many different scientists …
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do the following represent elements in a group, period, family or neith…
32. a. Group 33. b. Period 34. c. neither 35. a. Alkali metal 36. B. Halogen 37. c. Transition metal 38. solid
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bonds among water molecules covalent bonds hydrogen bonds polar bonds r…
hydrogen bonds
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25. in an atom the nucleus contains______. a. all the protons and neutr…
25. a. All the protons and neutrons 26. d. Subatomic particles 27. a. 0 28. b. 56 29. c. +1 30. a. Protons 31. c. 74.922 amu
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gizmo warm - up just like in a tug - of - war, atoms that are bonded to…
1. The sodium atom loses its valence electron to the chlorine atom. 2. Chlorine atom. Because chlorine is more electronegative. 3. Sodium becomes a lighter - colored cation, chlor…
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elements and the periodic table workbook this workbook contains a varie…
1. Hydrogen, H; Oxygen, O 2. Beryllium, Be; Calcium, Ca 3. Aluminum, Al; Barium, Ba 4. Iron, Fe; Silver, Ag
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student exploration: polarity and intermolecular forces vocabulary: dip…
1. The bully 2. The ball will stay in place.
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17. chromium is an example of an element that is a _. a. nonmetal b. tr…
17. b. Transition metal 18. a. The elements in each group have similar chemical properties 19. d. Strontium 20. b. Helium 21. c. Germanium 22. a. Br 23. c. Sn 24. (No options prov…
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13. calculate solve each of the following. a. if 22.99 g of sodium and …
$58.44\ g$ ### 13b
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b. cerebellum: c. pituitary gland: 10. explain the role of neurotransmi…
10. Neurotransmitters are chemical messengers that cross the synaptic cleft to bind to receptors on neighboring neurons, exciting or inhibiting their activity for neuron - to - ne…
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20 40.078 ca calcium a. atomic mass b. atomic number c. the number avai…
12. c. Al 13. b. Na 14. a. Calcium 15. d. Lead 16. b. An alkaline metal
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multiple - choice question what does it mean when we say that a molecul…
The molecule has an unequal sharing of electrons among atoms.
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which website citations are formatted correctly? select three options. …
B. Greene, Tom. Home Composting. Hanover Growers Guild, 15 March 2010. Web. 22 April 2011. C. Schultz, Renee. Monitoring Seed Germination. Chesterfield County Agricultural Extensi…
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6. who discovered the first subatomic particle? a. democritus. the atom…
6. c. Thomson. The electron 7. a. Electron cloud 8. c. Identity 9. d. Nucleus 10. b. Stability
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1.what element is shown in this bohr model? a. helium b. argon c. sulfu…
1. B. Argon 2. A. 3 3. C. 8 4. A. Selenium 5. C. Atomic number
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1.what element is shown in this bohr model? a. helium b. argon c. sulfu…
B. Argon
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11. describe the results of a physical change and list three examples o…
Results: Change in form or state without chemical composition change. Examples: Melting ice, tearing paper, cutting wood ### 12.
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question 3 1 pts the chemical messengers that are manufactured by a neu…
B. neurotransmitters
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post - lab for build an atom 1. you build an atom that has the followin…
# Explicación: ## Paso 1: Identificar el elemento El número de protones define el elemento. Con 3 protones, el elemento es litio (Li). ## Paso 2: Calcular la masa atómica La masa …
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10. classify each change as physical or chemical. a. crushing an alumin…
a. Physical change b. Physical change c. Chemical change
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1. the world energy consumption is shown in the chart below. categorize…
1. Wind power: KE Solar power: KE Nuclear: PE Natural Gas: PE Coal: PE 2. Initially gravitational potential energy, then kinetic energy during the fall, and upon hitting the groun…
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5. phenolphthalein will turn a solution pink if the solution contains a…
| Substance | Acid, Base, or Neutral? | Color after adding phenolphthalein | |--|--|--| | Soda | Acidic | Colorless | | Water | Neutral | Colorless | | Bleach | Alkaline | Pink | …
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instructions read and answer the following questions. (a) define the te…
23.3 amu
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started: oct 6 at 9:51am quiz instructions 1. read each question and an…
D. The amount of space that an object occupies, measured in liters or centimeters cubed. mL
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question 4 which answer choice gives the best description of mass and g…
The amount of matter in an object.
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2.1 evaluate quiz: introduction to matter (sc.8.p.8) quiz instructions …
Liquid B
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name: q1 chemistry: u2l6 isotope & ions review 2. use the data table be…
a. To create the mass spectrum: On the x - axis is the mass number and on the y - axis is the percent abundance. Plot peaks at approximately 69.92 amu with 20.84% abundance, 71.92…
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ariel has an object made of pure zinc with a mass of 2.6 grams. what is…
D. $0.4\text{cm}^3$
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22. create a graphic organizer using the terms bohr model, energy suble…
One possible graphic organizer structure: - **Models**: - Bohr model - Quantum - mechanical model - **Bohr model**: Orbit - **Quantum - mechanical model**: - Principal energy leve…
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instructions: in each question, identify the element with the greatest …
# Explicación paso a paso: ## Paso 1: Identificar los elementos en la tabla periódica Buscar la masa atómica de cada elemento en la tabla periódica. ## Paso 2: Ordenar los element…
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name: teacher: date: q1 chemistry: u2l10 periodic table practice prepwo…
1. $1s^{2}2s^{2}$ 2. Magnesium
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completion complete each statement on the line provided. 1. a(an) _____…
1. solid 2. volumes 3. solid 4. kinetic 5. collisions 6. increases; temperature 7. volume; temperature 8. Kelvin 9. atmospheric 10. exothermic 1. Solids have a definite shape and …
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7. the law that states that the volume of a gas is directly proportiona…
7. d. Charles's law. 8. c. 200 kilopascals. 9. d. both a and b 10. c. stays the same. 11. b. freezing 12. d. vaporization. 13. b. melting. 14. b. vaporization
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periodic table scavenger hunt! prework part 1: periodic table practice …
1. Gold (Au) 2. Magnesium (Mg) 3. Argon (Ar) 4. Lithium (Li) 5. Mercury (Hg), Bromine (Br) 6. Silicon (Si) 7. # of protons: 49, # of electrons: 52 8. Hydrogen (H) 9. Calcium (Ca) …
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1. fill in the blanks: potential energy is shown in the picture 4. in t…
3. $600\ J$ 4a. $29.4\ N$ 4b. $29.4\ J$ 4c. $88.2\ J$ 5. $24\ J$
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consider the element carbon. how many electrons can be found in a carbo…
B. 6, 4
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the difference between an atom like ca, and an ion of an atom, like ca²…
D. the number of electrons
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isotopes are two atoms that have the same ______ but different ______. …
A. mass number; atomic number
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what is the symbol for europium? o eu o eo o ep o em
A. Eu
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instructions: in each question, list the elements from least to greates…
1. C < Si < Sn < Pb 2. Ar < S < Si < Na 3. Ni < Ti < Ca < Ba 4. Na < K < Cs 5. P < Al < Mg 6. O < Zn < Rb
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periodic trends - atomic mass the atomic mass describes the mass of eac…
Draw vertical arrows pointing downwards for each group and horizontal arrows pointing to the right for each period on the given periodic - table grid.
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question 2 how does humidity affect air pressure? humidity does not aff…
Humidity decreases air pressure because water vapor is less dense than dry air.
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match the bone matrix component or function with the appropriate classi…
1. Inorganic material 2. Organic material 3. Organic material 4. Collagen 5. Hydroxyapatite
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energy and matter movement through biogeochemical cycles learn how to t…
# Explicaciones breves: Las nubes son agregados de partículas de vapor de agua y hielo que se mueven con los vientos. Transportan agua en forma de vapor de agua y en algunos casos…
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energy and matter movement through biogeochemical cycles learn how to t…
# Explicaciones Breves: Las corrientes marinas y los procesos biogeoquímicos mueven los minerales y nutrientes en los océanos de la Tierra a largas distancias. Por lo tanto, la af…
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question 17 how does humidity affect air pressure? humidity increases a…
Humidity decreases air pressure because water vapor is less dense than dry air.
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4. the atomic number, or ______ number, is described as the number of _…
A. protons, protons
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1. what is the order of the periodic chart based on 2. name the alkali …
1. By atomic number. 2. Lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), francium (Fr). 3. Beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), bariu…
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part a what is the correct number of protons, neutrons, and electrons f…
Part A: B. $6p^{+},7n^{0},6e^{-}$ Part B: Neutron
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a written document describing hazards of a chemical is a: * 1 point sds…
1. A. SDS 2. B. Fire extinguisher
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the federal agency that regulates workplace safety is: * 1 point osha c…
1. A. OSHA 2. B. PPE 3. (No options provided for the third question to give a full - fledged answer. If we assume it's a multiple - choice with options not shown, the concept is r…
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question 1. hydrogen primarily exists in three distinct forms: hydrogen…
Hydrogen - 1 (protium) has 1 proton and 0 neutrons, is stable. Hydrogen - 2 (deuterium) has 1 proton and 1 neutron, is stable. Hydrogen - 3 (tritium) has 1 proton and 2 neutrons, …
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question 2. the three isotopes of oxygen are oxygen - 16, oxygen - 17, …
| Isotope | Number of Protons | Number of Electrons | Number of Neutrons | Nuclear Notation | |---|---|---|---|---| | Oxygen - 16 | 8 | 8 | 8 | $_{8}^{16}O$ | | Oxygen - 17 | 8 | …
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question 3 a mechanism in a mechanics lift failed and a 1,000 kg car fe…
A. kinetic energy
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investigation 3 experience 1: ionic bonds name a. engage: what happens …
- Reaction of explosive metal with poisonous gas: Varies by specific substances. - Reaction of pure potassium with water: $2K(s)+2H_2O(l) ightarrow 2KOH(aq) + H_2(g)$, highly exot…
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choice: write the letter of the correct choice in the blank. 5. predict…
5. b. trigonal pyramidal 6. d. angular 7. c. trigonal planar
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in a chemistry lab, the temperature of a solution, f(s), in degrees cel…
C. 22
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naming warm - ups (10/3 - 10/10) day 1 (10/3) 1. write the name for p₅n…
1. Pentaphosphorus trinitride 2. $Zn(ClO_{3})_{2}$ 3. $H_{2}Br_{6}$ 4. $N_{7}F_{5}$ 5. Strontium bromide 6. Palladium(IV) sulfate
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question 2. complete the following table by dragging and dropping the c…
| Particle | Symbol | Location | Relative Charge | Relative Mass | |--|--|--|--|--| | Electron | $e^-$ | Surrounding the nucleus | - 1 | $\frac{1}{1840}$ | | Neutron | $n$ | In th…
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question 1. use the information provided to complete the table below. n…
| Notation | Atomic Number | Mass Number | Number of Protons | Number of Electrons | Number of Neutrons | | ---- | ---- | ---- | ---- | ---- | ---- | | Helium - 4 | 2 | 4 | 2 | 2 …
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which tool was most likely used in a procedure if the lab report shows …
B. a graduated cylinder
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which of these steps would most likely be part of a lab procedure? writ…
Record the time to complete a chemical reaction
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7. consider a mixture of water, sand, and oil. how many phases are pres…
7. Number of phases: 3. Separation method: Decantation followed by filtration. 8. a. Distillation b. Filtration c. Evaporation d. Fractional distillation e. Manual sorting f. Chro…
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question 1-27 the major forms of ____________ include thermal, radiant,…
A. energy
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chapter 3 achieving mental and emotional health vocabulary practice i. …
# Breve explicación: 1. La salud mental y emocional incluye la capacidad de aceptarse a sí mismo y manejar emociones. 2. Un modelo a seguir es alguien que sirve de ejemplo para lo…
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all of the following are treatments for mental health disorders except:…
B. chemotherapy
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which statement accurately describes part of the dissolving process of …
Water molecules surround solute molecules.
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which factor influences both solubility and the rate of dissolution? pr…
B. temperature
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which statement describes heterogeneous mixtures? they are made up of t…
They are made up of two or more pure substances that are not chemically bonded together and appear non - uniform.
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brownian motion is not observed in a mixture that includes two phases. …
B. a suspension
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which of the following observations would indicate that a material is a…
It cannot be physically broken down into different types of atoms.
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a can of soda contains many ingredients, including vanilla, caffeine, s…
water
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when a strip of magnesium metal is touched to a flame, a bright light a…
because a new substance is formed
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a piece of sodium metal can be described as o a pure substance and a co…
a pure substance and an element.