化学
化学反应、化学计量、分子结构与元素性质。
-
how many neutrons does this atom have? charge neutral mass 26 electrons…
14
-
complete the sentence using one of the following words: electrochemistr…
química
-
how many protons does this atom have? multiple - choice question
4
-
multiple - choice question what does this model represent? a negatively…
A neutral fluorine atom
-
complete the sentence using one of the following words: numbers, matter…
# Breve explicación: La química es la ciencia que estudia la materia, sus propiedades, estructura y los cambios que experimenta, incluyendo cómo los átomos se combinan para formar…
-
which statement is true regarding the macroscopic and microscopic natur…
# Breve explicación: La química estudia los cambios y propiedades de las sustancias a nivel macroscópico y microscópico. Los químicos realizan observaciones a nivel macroscópico (…
-
multiple - choice question what is this atoms charge, and why? 0, becau…
-1, because it has two electrons and only one proton
-
which question cannot be answered by chemistry? a how could a particula…
d. ¿Por qué existe la materia?
-
multiple - choice question what is this atoms mass, and why? protons ne…
2, because it has one proton and one neutron
-
which statement best describes the macroscopic and microscopic nature o…
# Breve explicación: La química estudia los cambios y propiedades de las sustancias a nivel macroscópico y microscópico. Los cambios en el nivel macroscópico se deben a lo que ocu…
-
multiple - choice question what is the charge of this atom? protons neu…
0
-
multiple - choice question what is the mass of this atom? what is the m…
3
-
nitrogen is the ____ in air. a solvent b solute c solution
a. Solvent
-
name warm up sept 18th be prepared for a quiz tomorrow (sept 19th frida…
$KBr, KCl, NaCl$
-
this model represents an atom of which element? protons neutrons electr…
A. Hydrogen
-
seawater is an example of a ______ solution. a liquid in gas b gas in l…
c. Solid in liquid
-
soda pop is an example of a ____ solution. a liquid in gas b gas in liq…
B. Gas in liquid
-
which of the following examples illustrates the phrase, \like dissolves…
D. two of the above
-
____ is a solute and ____ is a solvent in the atmosphere of earth. a wa…
B. Oxygen, nitrogen
-
which of the following example(s) from everyday life are made possible …
A. When you have a cold, you take a pill to get relief. B. After you eat an apple, you get a boost of energy. C. You wear a synthetic spandex athletic shirt while exercising.
-
5 g sodium is dissolved in 100 ml liquid ammonia. the solute(s) of the …
A. Na
-
15 ml water is added to in 50 ml aqueous kcl solution. the solvent of t…
A. Water
-
which of the following are considered to be part of the study of chemis…
# Breve explicación: La química es la ciencia que estudia las propiedades, la composición y los cambios de la materia. Las interacciones entre seres vivos son objeto de estudio de…
-
what is a type of contaminant that can cause foodborne illness? chemica…
A. parasites
-
which statement correctly describes the electrons in a water molecule? …
Electrons are pulled closer to the oxygen atom.
-
20. which of the following indicates that a physical change has taken p…
- Question 20: c. fracture formation - Question 21: d. extrusion - Question 22: d. two atoms of hydrogen - Question 23: b. diamond - Question 24: d. the rock cycle - Question 25: …
-
driver education final exam form a 1. a drivers license is required for…
1. C. Both I and II 2. D. revoke the driver’s license for at least 12 months 3. C. Both I and II 4. C. Both I and II 5. D. passing a stopped school bus loading and unloading child…
-
because many minerals are similar in color and certain elements may cha…
11. d. foliated 12. a. fractional crystallization 13. a. plain 14. c. coarse - grained/granite 15. b. regional metamorphism 16. a. joints 17. a. chain by sharing corner oxygen ato…
-
lets talk vocab...cosmetology: infection control for cos\ match the def…
43. AIDS 44. Non - porous 45. Tinea barbae 46. Centers for Disease Control and Prevention (CDC) 47. Acquired immunity 48. Disinfection 49. Tinea capitis 50. Antiseptic 51. Parasit…
-
what is the term for the study of matter and the changes it undergoes. …
a. Chemistry
-
for neutral atoms only, the number of protons is typically equal to the…
A. electrons
-
the statement, \when vinegar and baking soda are mixed, carbon dioxide …
# Breve explicación: La reacción entre vinagre (ácido acético) y bicarbonato de sodio (sodio hidrogenocarbonato) que produce dióxido de carbono es un fenómeno químico. En química …
-
what is responsible for ice floating in liquid water? a waters hydrogen…
d. all of the above
-
the bonding responsible for the structure of ice is: a hydrogen bonding…
d. covalent bonding and hydrogen bonding
-
fill in each blank with the most appropriate answer. the most important…
protons; nucleus; atomic number
-
the structure of ice is best characterized as: a an amorphous solid wit…
c. a hexagonally - shaped, open framework of molecules
-
the hydrogen bonds in liquid water are ______ because water ______. a s…
A. short - lived; is a fluid
-
cp earth science unit 1 multiple choice identify the choice that best c…
1. d. metamorphism 2. b. chemical bonds 3. d. Earth’s history and our place in the universe 4. d. astronomy 5. c. clastic 6. d. well sorted 7. b. silicon and oxygen 8. a. graded b…
-
metalloids have properties of metals and nonmetals and can be found on …
on the staircase
-
2 ml water is added to 100 ml aqueous sodium hydroxide solution. the so…
B. Water
-
delicious kool - aid is a common solution enjoyed in the summertime. wh…
D. Kool - aid mix is the solute and water is the solvent
-
out of the solute and solvent of a solution, which one is present in a …
B. Solvent
-
question 12 of 15 even though hydrogen is to the left of the staircase,…
B. Nonmetal
-
is the material present in the smaller amount. a solute b solution c so…
A. Solute
-
question 11 of 15 which family is the most stable? family 18 family 10 …
Family 18
-
question 1 of 5 which statement most accurately compares epic poetry an…
A. Epic poetry tends to be long, whereas lyric poetry tends to be short.
-
question 10 of 15 where are nonmetals found? to the left of the stairca…
C. To the right of the staircase
-
question 9 of 15 since a non - metal is brittle, it can be easily- diss…
broken
-
question 8 of 15 since metals are ductile, they can be- used to paint. …
stretched into wires
-
8. use the aufbau diagram to draw the orbital notation for nickel:
1s²2s²2p⁶3s²3p⁶4s²3d⁸ (In orbital - notation form, draw arrows in boxes: 1s has one box with two arrows of opposite spin, 2s has one box with two arrows of opposite spin, 2p has t…
-
since metals are malleable, they can be thrown in the air. thrown in th…
shaped
-
question 6 of 15 transition metals can be found- on the moon in nature …
B. In nature
-
part c: application 5. why are elements in the same group similar in ch…
5. Same number of valence electrons. 6. 7 7. Sodium (Na) is more reactive because sodium has 1 valence electron and readily donates it, while neon has a full outer - shell and is …
-
question 4 of 15 what is the most reactive family? family 1 family 18 f…
Family 1
-
question 3 of 15 ________ are good conductors of heat and electricity. …
A. Metals
-
question 1 of 15 what are the best conductors- metals metalloids nonmet…
A. Metals
-
this section describes what happens to chemical bonds during chemical r…
1. A process where reactants are transformed into products by breaking and forming chemical bonds. 2. Reactants: Starting substances in a chemical reaction. Products: Substances f…
-
this section describes what happens to chemical bonds during chemical r…
1. A process that changes one set of chemicals into another set of chemicals. 2. Reactants: Starting substances in a chemical reaction. Products: Substances produced by a chemical…
-
16. all of the following are renewable energy sources that will never r…
16. c) Wood 17. a) The Clean Air Act of 1972 reducing smog and other harmful pollutants in the atmosphere 18. d) Clean Water Act
-
which substance is a compound? o salt o phosphorus o sulfur o oxygen
salt
-
3. gases from the eruption are released into the air and combine with w…
B. Atmosphere & Hydrosphere — acid rain changes the chemical composition of the ocean
-
question 12 of 13 how many electrons can you have in the first ring? 18…
B. 2
-
comprehension check questions chem 2.2_periodic table & atomic calculat…
| Element (Nuclear notation) | Atomic # | Mass # | \(\#p^{+}\) | \(\#n^{0}\) | \(\#e^{-}\) | |---|---|---|---|---|---| | \(^{27}Al\) | \(13\) | \(27\) | \(13\) | \(14\) | \(13\) |…
-
question 11 of 13 elements in the same column, or family/group, have th…
True
-
question 10 of 13 elements in the same column, or family/group, have th…
C. Electrons (specifically valence electrons)
-
question 9 of 13 the arrangement of the periodic table is random. true …
B. False
-
directions: write the correct answer in the space provided. write the w…
9. True 10. False 11. True 12. True 13. False 14. N/A 15. N/A 16. N/A 17. N/A 18. N/A 19 - 25: N/A
-
question 8 of 13 what is inside the nucleus of an atom? shells electron…
C. Neutrons, D. Protons
-
4. fill in the following chart: (assume all atoms are electrically neut…
| Element symbol | Atomic number | Mass number | # of protons | # of neutrons | # of electrons | |---|---|---|---|---|---| | O | 8 | 16 | 8 | 8 | 8 | | Al | 13 | 27 | 13 | 14 | 13…
-
question 7 of 13 elements can combine with other elements to create com…
True
-
give the percent yield when 28.16 g of co2 are formed from the reaction…
$25.00\%$
-
given the following equation select the appropriate stoichiometric rati…
2 mol NO : 2 mol NH₃
-
question 4 of 13 everything around us is made up of elements true false
True
-
question 3 of 13 the atomic number is the number of- neutrons electrons…
C. Protons
-
question 1 match each term with its definition limiting reagent theoret…
limiting reagent: reactant which produces the least amount of product Theoretical yield: amount of product you can produce based off of the limiting reagent % yield: percentage of…
-
3. fill in the following chart. dont forget to come the isotope symbol …
| Element Symbol | Atomic number | Mass number | # of protons | # of neutrons | # of electrons | | ---- | ---- | ---- | ---- | ---- | ---- | | $_{19}^{39}K^+$ | 19 | 39 | 19 | 20 …
-
directions: place the correct letter in the space on the left. use all …
1. A. Flames 2. D. Lab apron 3. B. Safety Goggles 4. D. Electric Shock 5. B. Heat Resisting Gloves 6. C. Fumes 7. B. Hand washing 8. A. Poison
-
read passage 1: we real cool by gwendolyn brooks and then respond to qu…
B. It uses line length to show how the pool players' actions and lives are sudden and disconnected.
-
water molecules move faster as the temperature increases. what evidence…
The change of water from ice to liquid water and then to steam as temperature increases shows that water molecules move faster. In ice, molecules are relatively fixed; in liquid w…
-
consider these intermediate chemical equations. ch₄(g) + 2o₂(g) → co₂(g…
$\mathrm{CH}_{4}(g)+2\mathrm{O}_{2}(g) ightarrow\mathrm{CO}_{2}(g)+2\mathrm{H}_{2}\mathrm{O}(l)$
-
states of matter quiz cp chemistry a.0 / module 2: basics of matter 3. …
B. solid
-
in the final chemical equation, nacl and o2 are the products that are f…
multiplying the first equation by 2.
-
states of matter quiz cp chemistry a 0 / module 2: basics of matter 2. …
B. Gas, because the particles are very far apart from each other.
-
read the following information from a material safety data sheet (msds)…
A. Remove the shirt, and rinse the skin with water.
-
consider these intermediate chemical equations. no (g) + o₃ (g) → no₂ (…
$-304.1kJ$
-
consider these intermediate chemical equations. 2p (s) + 3cl₂ (g) → 2pc…
$PCl_3$
-
when two intermediate chemical equations are combined, the same substan…
It is a reactant in one intermediate reaction and a product in the other.
-
click the \investigation\ tab and break all the bonds in the reactants.…
- 802
-
the table shows the enthalpy values for the different bonds found in th…
$\Delta H=(4\times413)+(2\times495)-(2\times799)-(4\times463)$ (but from the given options, the part related to bonds broken in $CH_4$ is $\Delta H=(4\times413)+\cdots$ so the rel…
-
what can happen to solar radiation when it enters earths atmosphere? it…
It is absorbed or reflected as it travels to Earth’s surface.
-
chemical bonds have bond enthalpies that describe how much energy is ab…
Total number of C - H bonds in the reactants: 4 Total number of $O = O$ bonds in the reactants: 2 Total number of $C = O$ bonds in the products: 2 Total number of O - H bonds in t…
-
a high school chemistry student is tasked with determining the density …
C. 23.7 $cm^{3}$
-
select basic polar non - polar acidic select
For the top structure: Polar, Acidic For the bottom structure: Basic
-
a sample of metal is heated until it melts and begins to glow red. when…
FALSE
-
causes of drought 1 several factors contribute to drought: 2 low precip…
- The four factors that contribute to drought are low precipitation, changes in climate, water quality issues, and high demand for freshwater. - The main idea of this section is t…
-
someone is working in their garden, giving some plants a liquid fertili…
FALSE
-
select the correct text in the passage. in this excerpt from annus mira…
Methinks already from this chemic flame / I see a city of more precious mould / Rich as the town which gives the Indies name / With silver paved, and all divine with gold
-
a liquid in a container is heated until it turns to a gas. this is enou…
FALSE
-
when two colorless liquids are mixed together, the formation of a solid…
reaction
-
4. if your job is to test the amount of lead found in paint samples, wh…
D. analytical chemistry