Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
-
properties can be observed only when substances are changing into diffe…
First question: Chemical Second question: Change in color, Formation of a precipitate, Evolution of gas
-
3 ccc scale, proportion, and quantity which subatomic particles account…
Protons and neutrons account for most of an atom's mass; electrons account for most of an atom's volume.
-
butane gas has a density of 2.54 kg/m³. air has a density of 1.22 kg/m³…
Sink
-
a ____ is a practical person * 10 points pragmatist theorist realist sc…
1. A. Pragmatist 2. D. critical thinking
-
butane gas has a density of 7.56 kg/m³. air has a density of 1.27 kg/m³…
1. True 2. False
-
charlie takes a supplement that is labeled as atural.\ what does this l…
Nothing; "natural" is not verified by anyone.
-
calculating average atomic mass - round average atomic mass to 3 decima…
1. $14.004$ 2. $39.985$ 3. $117.755$ 4. $82.986$
-
given this table of electronegativities: atom electronegativity h 2.2 c…
$CO_2<NI_3<HI<NH_3$
-
using the vsepr model, predict the electron domain geometry and the mol…
Part 1 of 4 ClF₃ Electron Domain Geometry: trigonal bipyramidal Molecular Geometry: T - shaped Part 2 of 4 SeCl₆ Electron Domain Geometry: octahedral Molecular Geometry: octahedral
-
question 1 (2 points) ________ is the process of focusing awareness on …
Question 1: D. Attention Question 2: D. photoreceptors
-
how many protons does this atom have? how many neutrons does this atom …
Number of protons: <Count of blue + spheres in nucleus> Number of neutrons: <Count of red spheres in nucleus> Number of electrons: <Count of green spheres outside nucleus>
-
an atomic scientist was studying an atom and through experimentation fo…
This atom has nine electrons.
-
which statement(s) correctly compare the masses of protons, neutrons, a…
Protons and neutrons have similar mass. Electrons are smaller than a proton or a neutron.
-
a venn diagram shows the similarities and the differences of two things…
A. Found in the nucleus E. Has mass of one amu
-
8) write the nuclear symbols for both atoms: 9) explain why they are or…
8) First atom: $_{5}^{10}B$, Second atom: $_{5}^{11}B$ 9) They are isotopes because they have the same number of protons (5) but different numbers of neutrons (5 and 6).
-
knowing what you know about the nucleus and the subatomic particles in …
Positive
-
7) element x has 3 isotopes. one isotope has a mass of 127.0 and is fou…
$126.86$
-
objective 5: rewind your mind 1. how are minerals place into families/g…
1. Based on chemical composition and crystal structure. 2. Igneous, sedimentary, and metamorphic. 3. Melting of metamorphic rock into magma; when magma cools to form igneous rock,…
-
an element has the following isotopes: abundance mass/amu 1.40% 203.973…
208.22 amu Bi
-
jaiden is writing a report about the structure of the atom. in her repo…
No, because an atom has three sub - atomic particles (protons, neutrons, electrons), not two as stated.
-
19. 0 / 1 points sulfur has four isotopes: sulfur 32 (31.97207 amu, 95.…
$32.06383$
-
physical and chemical properties physical properties are observable and…
1. Physical Property 2. Physical Property 3. Chemical Property 4. Physical Property 5. Chemical Property 6. Physical Property 7. Physical Property 8. Physical Property 9. Physical…
-
6) determine the average atomic mass of the isotopes in the data table …
$10.811$
-
element information section answer the following questions. use proper …
a. There are 8 protons and 8 neutrons in the nucleus. b. There are 2 electrons in Energy Level (Shell) 1. c. There are 6 electrons in Energy Level (Shell) 2. d. There are 0 electr…
-
sep develop models each helium atom has two protons. sketch models of h…
Sketch a model of helium - 3 with 2 protons, 1 neutron in the nucleus and 2 electrons in electron - shells. Sketch a model of helium - 4 with 2 protons, 2 neutrons in the nucleus …
-
sep develop models each helium atom has two protons. sketch models of h…
Sketch a model of helium - 3 with 2 protons, 1 neutron, and 2 electrons. Sketch a model of helium - 4 with 2 protons, 2 neutrons, and 2 electrons, labeling protons, neutrons, and …
-
5) pure nitrogen is found as a mixture of 2 isotopes, n - 14 and n - 15…
The percent abundance of N - 14 is 99% and the percent abundance of N - 15 is 1%.
-
4.) why is mass number a whole number, but atomic mass a decimal number?
The mass number is a count of protons and neutrons (whole entities), while atomic mass is a weighted - average of isotope masses, leading to a decimal value.
-
3.) what are two characteristics atomic isotopes differ in: a) ________…
a) Mass - number b) Atomic mass
-
fill in each blank with a word from the vocabulary in the reading passa…
1. subatomic 2. neutron 3. charge 4. chemical 5. electron 6. atom 7. meitnerium 8. mass 9. Periodic 10. hydrogen 11. nucleus 12. particles 13. protons 14. elements 15. matter
-
2. what are two characteristics atomic isotopes must have in common: b)_
a) Number of protons b) Chemical properties
-
explaining the importance of stud based on what you have just read, why…
Studying atoms and their parts and particles is helpful for understanding matter, advancing in medicine, materials science, energy, and developing new technologies to solve enviro…
-
1. explain why the beans could be compared to atomic isotopes?
Beans can be compared to atomic isotopes because different - sized or - weighted beans can represent isotopes of an element, similar to how isotopes of an element have similar che…
-
which atom is being researched as a possible ingredient of magnetic soa…
D. iron
-
question 1 2 pts which is the most compelling reason parents should int…
Food allergies may present
-
6 sep use mathematics complete the table by identifying the atomic numb…
| Atom | Atomic number | Mass number | Protons | Electrons | Neutrons | | ---- | ---- | ---- | ---- | ---- | ---- | | $\ce{^{23}_{11}Na}$ | 11 | 23 | 11 | 11 | 12 | | $\ce{^{32}_{…
-
use the information from the reading passage to answer the following qu…
1. Protons, neutrons, electrons 2. Protons, neutrons 3. Hydrogen, oxygen, carbon 4. The number of protons 5. 8 6. The number of protons in an atom's nucleus 7. The sum of protons …
-
sep use mathematics complete the table by identifying the atomic number…
| Atom | Atomic number | Mass number | Protons | Electrons | Neutrons | |---|---|---|---|---|---| | \(_{11}^{23}Na\) | 11 | 23 | 11 | 11 | 12 | | \(_{16}^{32}S\) | 16 | 32 | 16 | …
-
19. a family goes camping and creates a fire to roast marshmallows. the…
19. C. The ashes cannot be put back together to create a log again. 20. C. The process cannot be reversed.
-
practice and apply use complete sentences to answer each question, show…
1. They hoped to project strength and dignity. 2. Because it could weaken the community and increase vulnerability. 3. To build discipline, strength, and necessary values and skil…
-
which is an example of a chemical change? a baking a cake b. freezing w…
1. A. baking a cake 2. C. an ice cube melting 3. A. physical 4. D. Ice melting is a physical change because it may be reversed.
-
11. which best explains why melting ice is a physical change instead of…
11. C. It does not form a new substance. 12. A. A physical change occurs, because the water changes form. 13. D. A physical change occurs because water and vapor are different sta…
-
match the vocabulary word to its definition. neutron a neutral particle…
neutron - a neutral particle located in the nucleus of an atom nucleus - the central part of the atom containing protons and neutrons proton - a positively charged particle locate…
-
which example best describes a chemical change? a wax melting b an appl…
6. B. an apple turning brown 7. C. breaking an egg 8. D. It was a chemical change, because rust is a new substance on the metal. 9. A. A piece of wood is burned and turns to ash. …
-
1 which example best describes a physical change? a baking a pie b burn…
1. C. making a paper airplane 2. A. crayons melted; changed from solid to liquid 3. C. chocolate left in a warm car to melt 4. A. The basketball’s shape is changed. 5. B. baking c…
-
9. as the gas in a rigid container is heated, its a. pressure increases…
9. a. pressure increases. 10. b. flows quickly. 11. volume 12. high; low 13. Chemical 14. Sublimation 15. law of conservation of energy 16. True 17. False (New substances are form…
-
write the letter of the correct answer on the line at the left. 1. the …
1. a. temperature 2. d. definite volume 3. b. condensation 4. b. becomes softer and softer as temperature rises 5. c. volume decreases 6. d. water droplets form on a mirror 7. c. …
-
8. a chemical bond is a. a group of atoms that are joined together. b. …
8. c. the force that holds two atoms together. 9. d. burning leaves 10. a. They are composed of molecules. 11. molecule 12. density 13. length 14. element 15. ore 16. False. Durin…
-
multiple choice write the letter of the correct answer on the line at t…
1. a. boiling point 2. b. volume 3. d. by heating iron ore and a source of carbon 4. c. different samples have different properties 5. a. mass 6. c. never change 7. d. solution
-
identify the parts of the atom that are labeled in the diagram. label a…
Label A: Nucleus Label B: Electron
-
what fraction of the daughter material exist after 2 half - lives? obje…
\(\frac{3}{4}\) 1. # Brief Explanations: Minerals are grouped based on their chemical composition and crystal structure. For example, silicates are minerals that contain silicon a…
-
the pronoun in bold is not vague. select its one clear antecedent. nine…
Ninety - two chemical elements
-
the reasoning below is... claim: humans enjoy interacting with pets bec…
Weak Reasoning: Doesn't Connect the Evidence to the Claim
-
remember the amount of energy going in to a system must equal the amoun…
Microwave: 5000 J thermal energy out; Lamp: 2400 J light energy out; Heater: 2000 J electrical energy in; Bus: 2500 J thermal energy out; Singer: 483 J mechanical energy out; Rock…
-
9 multiple choice 4 points which of these individuals criticized the us…
9. Dr. Richard Harlan criticized the use of common preservatives such as arsenic in regards to embalming. 10. Without specific historical context, it's hard to say for sure, but l…
-
15. the graph above shows how a particular real gas deviates from ideal…
D. $SO_2$, because it has the largest molecular volume. ### 16.
-
physical and chemical changes understanding main ideas check the type o…
1. Physical Change 2. Chemical Change 3. Physical Change 4. Physical Change 5. The total amount of energy is conserved in both physical and chemical changes according to the law o…
-
13. equimolar samples of ch4(g) and c2h6(g) are in identical containers…
13. B. $C_{2}H_{6}$ molecules have a larger, more polarizable electron cloud than $CH_{4}$ molecules do. 14. D. $CO_{2}$ is a nonpolar molecule that has London dispersion intermol…
-
which statement best describes the rhythm of \song of myself\? the poem…
The rhythm is very similar to the rhythm of everyday speech.
-
arrange the highlighted bonds in the table below in decreasing order of…
1. P - F 2. S - F 3. Cl - F
-
the diagrams above use arrows to represent the speed of a gas particle.…
10. D 11. D
-
8. at 10.°c, 20.g of oxygen gas exerts a pressure of 2.1atm in a rigid,…
B. 2.3 atm, because the pressure P increases by the proportion $\frac{313}{283}$ ### 9.
-
question 3 2 pts antibodies are edema - causing large peptide molecules…
giant protein molecules
-
question 2 2 pts amino means containing ______. oxygen nitrogen carbon …
B. nitrogen
-
which statement belongs to daltons atomic theory? atoms have a massive,…
Atoms cannot be created or destroyed.
-
6. the structures of two allotropes of carbon are represented above. wh…
C. Carbon atoms in diamond have four covalent bonds, whereas graphite is made of layers that are held together by relatively weak dispersion forces. ### 7.
-
the atomic models after daltons time included ideas about the atomic st…
Schrödinger's model
-
4. the diagrams to the left represent two allotropes of solid phosphoru…
B. Allotrope II, because it has covalent bonds between the phosphorous atoms that are stronger than the dispersion forces between the $P_4$ molecules in allotrope I. ### 5.
-
the plum pudding model of the atom states that each atom has an overall…
an atom is made up of electrons in a sea of positive charges.
-
match each attractive force with the name or description column a 1. c …
4. c 5. f 6. c 7. c 8. f
-
you may use the tables of slide #18 of module 4.1 to answer the followi…
(1) 4 (2) 1 (3) 4
-
question 18 of 20 what nacl concentration results when 304 ml of a 0.60…
$0.394$
-
question 8 sodium chloride (nacl) has a density of 2.17 g/cm³. the atom…
(a) $0.565$ nm (b) $0.566$ nm
-
aqueous hydrochloric acid (hcl) reacts with solid sodium hydroxide (nao…
$36.0\%$
-
each week capechem, a manufacturer of fine chemicals, uses up 350 kg of…
The maximum theoretical mass of Compound C: 1300 kg The average amount of Compound C actually shipped: 754 kg
-
gaseous methane (ch₄) will react with gaseous oxygen (o₂) to produce ga…
8.4 g
-
question 6 2 pts on the basis of ionic charge and ionic radii, predict …
(1) 0.627 (2) Face - centered cubic (rock - salt type)
-
gaseous ammonia chemically reacts with oxygen (o₂) gas to produce nitro…
$0.11\ mol$
-
the drawing below shows a mixture of molecules: key carbon hydrogen nit…
Of which reactant are there the most initial moles? Enter its chemical formula: $O_2$ Of which reactant are there the least initial moles? Enter its chemical formula: $CS_2$ Which…
-
if a chemical reaction does happen, write a balanced chemical equation …
$4HCl(g) ightarrow 2H_2(g)+2Cl_2(g)$
-
gaseous water and solid potassium oxide are formed by the decomposition…
$2KOH(s) ightarrow H_2O(g)+K_2O(s)$
-
question 11 - 1 point what types of molecules will display hydrogen bon…
Polar molecules containing a hydrogen directly bonded to an electronegative atom (nitrogen, oxygen, fluorine)
-
in the polar molecule hbr, what charge does the h bear? select the corr…
A. Partial positive
-
an ax ceramic compound has the rock salt crystal structure. if the radi…
$1.75\ g/cm^{3}$
-
question 9 · 1 point which state of matter has the weakest intermolecul…
A. Gas
-
question 8 - 1 point which pair of elements will form an ionic compound…
D. Na and F
-
which bond is least polar? select the correct answer below: o na - cl o…
P - Cl
-
which is the correct lewis symbol for a nitrogen atom? select the corre…
O $\cdot\ddot{N}\cdot$
-
what is the name of the compound with the chemical formula xeo₃? select…
D. xenon trioxide
-
question 4 - 1 point which is a difference between molecular compounds …
Molecular compounds are formed of discrete, neutral molecules, while ionic compounds are formed of large repeating arrays of opposite charges.
-
what is the chemical formula for the ionic compound barium iodide? sele…
D. $BaI_{2}$
-
question 2 - 1 point which anion would bond with k+ in a 1 : 1 ratio to…
B. $F^-$
-
question 1 · 1 point what is the name for a positively charged ion? sel…
A. Cation
-
molecules with hydrogen bonds (ch(_3))(_3)n c(_2)h(_5)oh ch(_3)nh(_2) h…
$C_2H_5OH$, $CH_3NH_2$, $CH_3COOH$, $HF$
-
question examine the list of compounds and drag the formulas into the a…
| Ionic bonds | Covalent bonds | Both ionic and covalent bonds | | --- | --- | --- | | Na₃N, LiI | NH₃, CCl₄ | NH₄NO₃, Li₂CO₃ |
-
compound x has a molar mass of 416.41 g·mol⁻¹ and the following composi…
\(P_2Cl_{10}\)
-
intermolecular forces are primarily responsible for: select the correct…
B. holding together molecules in a material
-
question examine the following substances and determine which box each …
- solid iodine: Both intermolecular and intramolecular - argon gas: Intermolecular only - liquid mercury: Intermolecular only - solid sodium chloride: Both intermolecular and intr…
-
question which of the following would have the lowest imf? select the c…
A. gas
-
question polar molecules have attractive dipole - dipole interactions w…
head - to - tail: →→, side - to - side, antiparallel: ↑↓