Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
-
1 ion comes from a greek word that means \going\ or \something that goe…
B. They are active, likely to participate in reactions
-
7. when determining charges in sodium chloride and ethane, why were you…
Water is polar. For \(NaCl\), its ions interact with water's polar ends (helping determine charges). Water dissolves \(NaCl\) (due to ion - dipole forces) but not ethane (non - po…
-
select the correct answer. which naming scheme identifies the columns o…
D. A, B, C
-
brainpop science / investigation / activate | page 2 of 4 this image is…
D. Crystallization
-
10 mark q review a chemist mixed a liters of a 2% saline solution with …
A. \(0.02x + 0.07y=0.04(x + y)\)
-
to collect salt this way, ocean water is channeled into large, shallow …
C. Salt dissolves in water but it does not evaporate
-
multiple choice 2 points what does \organic\ mean when referring to foo…
It is certified to have grown on soil without prohibited substances for three years prior to harvest.
-
read the poem. there are 20 lines in the poem. the poem is numbered eve…
Part A: 2. Troubles will return, but summer lets the speaker forget them for a short time. Part B: 2. "Before my cottage door she spread The softest carpet nature weaves," (Lines …
-
1 this video shows a traditional method of harvesting sea salt. how is …
- They are both white solids - They are both made of tiny crystals
-
read the lines from act ii, scene ii of romeo and juliet. juliet: o rom…
hope - fulness and longing.
-
note: to answer some of the questions, it may help to reference a perio…
The central iodine atom has 10 valence electrons (3 bonding pairs and 2 lone pairs) instead of 8, thus breaking the octet rule.
-
match each energy form with the correct example. electrical sound light…
electrical - static shock sound - horn blowing light - sunlight chemical - coal combustion nuclear - atomic fission
-
note: to answer some of the questions, it may help to reference a perio…
tetrahedral shape because there are four shared pairs of electrons and no lone pairs of electrons in the bond.
-
using vsper theory, what are the approximate bond angles of a compound …
The molecule will form \(120^{\circ}\) bond angles because the lack of lone pair electrons means there will be no additional repulsion forces acting upon the atoms. Therefore, ato…
-
based on the vsepr theory, what molecular shape can be predicted if a m…
bent structure
-
3. how are molecules formed?
Molecules are formed when atoms bond together through covalent, ionic, or metallic bonds.
-
note: to answer some of the questions, it may help to reference a perio…
the number of lone pairs of electrons on the central atom, the size of the central atom in the bond, the number of bonding pairs of electrons on the central atom
-
2. what is the periodic table of elements?
The Periodic Table of Elements is a tabular arrangement of chemical elements organized by atomic number, electron configuration, and chemical properties, showing trends in propert…
-
note: to answer some of the questions, it may help to reference a perio…
molecular geometry
-
5) sodium bicarbonate (baking soda) - find the mass of a scoop of bakin…
a) \(0.0401\space mol\) b) \(2.415\times 10^{22}\space molecules\) c) \(1.449\times 10^{23}\space atoms\)
-
note: to answer some of the questions, it may help to reference a perio…
valence bond theory
-
1. find the words that are defined in the table below. 2. place the wor…
1. Atom 2. Proton 3. Neutron 4. Electron 5. Ion 6. Isotope 7. Atomic number 8. Mass number 9. Nucleus 10. Electron cloud 11. Democritus 12. J.J. Thomson 13. Ernest Rutherford 14. …
-
note: to answer some of the questions, it may help to reference a perio…
The first option: Oxygen has six valence electrons; it needs to gain two electrons to reach the octet rule with a full second energy orbital. Magnesium has two valence electrons; …
-
note: to answer some of the questions, it may help to reference a perio…
space - filling model, ball - and - stick model
-
muscles functioning anaerobically sports physiologists at an olympic tr…
lactate
-
note: to answer some of the questions, it may help to reference a perio…
The first image (with 6 dots around \(O\)) shows the proper Lewis structure for an atom of oxygen.
-
what is the octet rule? in order to achieve eight total electrons, atom…
In order to reach eight electrons in their valence shells, atoms tend to lose, gain, or share electrons.
-
why would two atoms form a covalent bond instead of an ionic bond? both…
Both atoms in a bond have high electronegativity; thus, neither atom is willing to transfer the electrons. Instead, the atoms both share electrons to satisfy the octet rule.
-
which type of compound is a white powder that does not dissolve in a po…
i. covalent compound
-
note: to answer some of the questions, it may help to reference a perio…
A double bond is between the two carbon atoms and each hydrogen atom shares a single bond with a carbon.
-
silicon dioxide (sand) - find the mass of a scoop of sand using a weigh…
a) \(n=\frac{3.25}{60.09}\approx0.0541\) mol b) \(N = 0.0541\times6.022\times10^{23}\approx3.26\times10^{22}\) molecules c) \(N_O=2\times3.26\times10^{22}=6.52\times10^{22}\) O at…
-
note: to answer some of the questions, it may help to reference a perio…
covalent bond
-
aluminum - find the mass of the aluminum foil. a) calculate the number …
a) The number of moles is approximately \(1.48\times 10^{-3}\space mol\) b) The number of aluminum atoms is approximately \(8.91\times 10^{20}\space atoms\)
-
2) copper - find the mass of the copper wire. a) calculate the number o…
a) The number of moles is approximately \(0.00535\space mol\). b) The number of copper atoms is approximately \(3.22\times 10^{21}\space atoms\).
-
based on the chemical formula, what type of compound is sodium nitrate …
Sodium nitrate is an ionic compound because it is composed of a positive and negative ion (metal and nonmetal).). A metallic compound would have multiple metals bonded to each oth…
-
note: to answer some of the questions, it may help to reference a perio…
B. This model is not an ionic compound because the electrons are not being transferred between positive and negative ions; instead, only positive ions are present. C. metallic com…
-
which instrument would be most useful for identifying the chemical comp…
Spectroscope
-
note: to answer some of the questions, it may help to reference a perio…
The compound represented in the model is metallic. This is because it shows positive ions surrounded by a sea of delocalized electrons (the blue spheres), which is the key feature…
-
1) metal - find the mass of the piece of metal. a) calculate the number…
a) The number of moles is approximately $0.4444\ mol$. b) The number of atoms is approximately $2.677\times 10^{23}\ atoms$.
-
if a compound is a brittle, blue crystal with a high melting point, wha…
ionic compound
-
note: to answer some of the questions, it may help to reference a perio…
a compound consisting of a bond between metals and nonmetals
-
why do industries use metallic compounds to make wires? (select all tha…
- First option: Metallic compounds are ductile due to the free - moving electrons that allow the metal nuclei to roll over each other; thus, they are able to be re - shaped into t…
-
note: to answer some of the questions, it may help to reference a perio…
the sea of electrons being freely shared between the positive nuclei of the metal atoms
-
lab #11: mole calculations name purpose: to become proficient in calcul…
a) Approximately \(0.00694mol\) b) Approximately \(4.18\times 10^{21}\) molecules c) Approximately \(1.254\times 10^{22}\) atoms
-
note: to answer some of the questions, it may help to reference a perio…
Electrons
-
note: to answer some of the questions, it may help to reference a perio…
The electrons are shared by all the nuclei because the electrons are not strongly attracted to the atoms' nuclei and therefore move around freely between the metal atoms.
-
to answer some of the questions, it may help to reference a periodic ta…
hexagonal close - packed crystal structure
-
what is formed when the positively charged ions of metals are evenly ar…
metallic bond
-
which term describes the physical properties of a metal? (select all th…
malleable, conducts heat well, ductile
-
how many electrons, protons, and neutrons are in an atom of $_{45}^{67}…
a. 45 electrons, 45 protons, 22 neutrons.
-
question 9 (10 points) each group a number (1a, 2a, 3a, 4a, 5a, 6a, 7a,…
c. a valence electron
-
multiple - choice question what is chlorine gas classified as? compound…
Element
-
verdadero o falso: la fórmula química de la glucosa es c - 5 h - 12 o -…
FALSO
-
multiple - choice question what is steel classified as? homogeneous mix…
Homogeneous mixture
-
multiple - choice question what is sugar classified as? compound hetero…
Compound
-
multiple - choice question what is air classified as? homogeneous mixtu…
Homogeneous mixture
-
multiple - choice question what is aluminum classified as? compound ele…
B. Element
-
multiple - choice question what is sea water (salt water)? heterogeneou…
Homogeneous mixture
-
multiple - choice question what is crushed ice? compound element hetero…
Compound
-
multiple - choice question what is the difference between homogeneous a…
A. A homogeneous mixture is evenly mixed, hard to see the different parts.
-
multiple - choice question what is a pure substance? it is made of one …
It is one type of matter.
-
which statement best describes how potassium bonds with bromine? potass…
Potassium will donate an electron to bromine.
-
compounds can be classified as covalent or ionic by noting the location…
sulfur dioxide (SO₂)
-
cms physical science: unit 3 summative assessment 7 of 20 ionic compoun…
C. potassium chloride (KCl)
-
alkaline earth metals are not found in their free state in nature. thei…
C. Ionic
-
methanol (wood alcohol) can be produced by the following reaction. co₂ …
B. hydrogen (\(H_2\))
-
when table salt (nacl) is produced, which of the following best describ…
Sodium and chlorine atoms bond chemically.
-
question 6 (6 points) an atom containing 43 protons, 56 neutrons, and 4…
A. \(^{99}\text{Tc}\)
-
what is the iupac name for the compound n₂o₃? nitric oxide nitrous oxid…
C. dinitrogen trioxide
-
cms physical science unit 3 summative assessment the dot structure for …
Sodium will lose 1 electron and form an ion.
-
question 5 (12 points) which element has the ground state electron conf…
a. Copper
-
a bond is formed when an electron is transferred from a sodium atom to …
The atom becomes a positive ion.
-
magnesium bromide is one of the most abundant compounds found in seawat…
\(MgBr_{2}\) (the fourth option \(MgBr_{2}\))
-
try these ones... count the number of atoms of each element in the foll…
| Compound | Elements Present | Number of Atoms | |---|---|---| | \(CuSO_4\) | \(Cu\) | \(1\) | | | \(S\) | \(1\) | | | \(O\) | \(4\) | | | Total Number of Atoms: | \(6\) | | \(Li…
-
question 3 (6 points) the number of protons in an atom of an element is…
C. atomic number.
-
directions: the article below discusses the venezuelan economy. use the…
B. Socialism
-
select the correct answer. macy observes the lake near a park is covere…
B. An algal bloom has drained the lake of oxygen.
-
which of the following people will be most likely to pay the lowest hea…
A person who is a nonsmoker for more than 10 years.
-
how does oxygen make water?* 1 point it combines with one hydrogen it c…
It combines with two hydrogens.
-
classify each of the materials below. in the center column, state wheth…
| Material | Pure Substance or Mixture | Element, Compound, Homogeneous, Heterogeneous | |--|--|--| | concrete | Mixture | Heterogeneous | | sugar + pure water ($C_{12}H_{22}O_{11…
-
picture 6 classification choices - element, compound, homogenous mixtur…
Hétérogène mixture. 1. Les composants sont visuellement distincts. 2. Les propriétés physiques ne sont pas uniformes.
-
question 10 (1 point) how many grams are 0.00771 moles of aspirin? repo…
1.39
-
question 9 (1 point) how many moles are 0.5896 g of salicylic acid? rep…
0.00427
-
question 8 (1 point) how many moles are 8.38 ml of acetic anhydride? re…
0.0886
-
question 7 (1 point) given that the density of acetic anhydride is 1.08…
4.77
-
question 5 (1 point) what is the molecular formula of aspirin? hc₂h₃o₂ …
C. \(C_9H_8O_4\)
-
question 4 (1 point) what is the molar mass of acetic anhydride? use th…
102.09
-
question 3 (1 point) what is the molecular formula of acetic anhydride?…
\(C_4H_6O_3\) (the fourth option)
-
question 2 (1 point) what is the molar mass of salicylic acid? use the …
138.12
-
question 1 (1 point) what is the molecular formula of salicylic acid? c…
\(C_7H_6O_3\)
-
practice it! reflect upon what you have learned about the transformatio…
Electrical energy is the movement of protons to create electricity.
-
d. alexis sister does not like to ride a dirty bike 4. what happened to…
4. d. His bike began to rust 5. b. Folding paper into a paper airplane
-
1. why is denting the bike fender not a chemical change? a. the bike lo…
1. B. The metal does not change into another substance it only changed its shape 2. C. A new substance is formed that is different from the original substance 3. A. So their bikes…
-
properties of atoms and the periodic table directions: match the term i…
1. g. mass number 2. j. electron cloud 3. a. nucleus 4. n. group 5. d. neutrons 6. i. average atomic mass 7. c. protons 8. k. periodic table 9. o. electron dot diagram 10. b. elec…
-
which of the following are accurate examples of forms of energy? a lawn…
A. A lawn mower uses mechanical energy. C. A battery stores chemical energy. E. A hot cup of coffee contains thermal energy.
-
drag and drop the words or phrases that accurately complete the paragra…
1. potential 2. stored 3. kinetic 4. transformed
-
q.22. the table shows the melting points and boiling points for differe…
| | State at Room Temperature | |--|--| | Water | liquid | | Oxygen | gas | | Iron | solid | | Sulfuric acid | liquid | | Magnesium | solid | | Nitrogen | gas |
-
surname: q.14. when the particles are ____________, they gain energy an…
Q.14: a) heated Q.15: c) Gas Q.16: b) Pencil Q.17: c) Condensation Q.18: d) Freezing Q.19: a) Sublimation Q.20: c) gas Q.21: b) liquid Q.22: - Water: liquid - Oxygen: gas - Iron: …
-
summarize it! drag and drop the words or phrases that accurately comple…
1. cannot 2. kinetic 3. mechanical
-
practice it! dante eats a large bowl of cereal before walking to school…
Dante is using gravitational potential energy when walking to school.