Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
-
mineral oil is not as good as water at dissolving salts. do we think th…
The bonds in mineral oil are a different kind of bond. Mineral oil has non - polar covalent bonds, while salts have ionic bonds and water has polar covalent bonds.
-
write in word form: 3 h₂ + p₂ → 2 ph₃ 6 atoms of hydrogen react with 2 …
B. 3 molecules of $H_2$ react with 1 molecule of $P_2$ to yield 2 molecules of $PH_3$
-
if water is not a salt, why do you think it is good at dissolving? a wa…
Water is a good solvent because it is a polar molecule with distinct positive and negative ends which can interact with solute ions.
-
a chemist mixes different concentrations of perfume using three scents …
$\begin{bmatrix}2&4&4\\4&2&4\\1&7&2\end{bmatrix}\begin{bmatrix}x_1\\x_2\\x_3\end{bmatrix}=\begin{bmatrix}2.2\\2.7\\2.35\end{bmatrix}$
-
how does this difference help us explain the difference in properties? …
The difference in bonding (ionic in NaCl and intermolecular like hydrogen - bonding in H₂O) accounts for NaCl being a solid and H₂O being a liquid at room temperature due to the v…
-
if electrons are not transferred in a water molecule, are ions created?…
B. No
-
draw a model of an ionic compound: nacl
You would draw a three - dimensional lattice structure with sodium ions (Na⁺) and chloride ions (Cl⁻) alternating in all three dimensions to represent the ionic compound NaCl. For…
-
a chemist mixes different concentrations of perfume using three scents …
10 oz for each trial.
-
what do we need to revise?think about what we know about bonding, elect…
Draw a model showing the oxygen atom in the center of the water molecule with two single covalent bonds to two hydrogen atoms. The oxygen atom has two lone pairs of electrons on i…
-
do you think water is a salt? why or why not? water is not a salt. a sa…
Water is not a salt.
-
10. calculate the molar mass of the triprotic acid for two trials that …
$6.09$
-
what kind of energy does food give your body? chemical energy light ene…
A. chemical energy
-
bj: post - processing. use the information below to answer the question…
a bronze infiltration
-
try to relate what we learned about salts and how they bond to water. i…
The Lewis structure of water has an oxygen atom in the center with two single bonds to two hydrogen atoms and two non - bonding pairs of electrons on the oxygen atom. It can be re…
-
bj: post - processing. use the information below to answer the question…
B. a high - pressure air hose
-
1-4 review and reinforcement units of measurement answer each of the fo…
1. The International System of Units provides a universal, standardized way for scientists to communicate measurements, ensuring accuracy and reproducibility of experiments across…
-
part b application questions: answer the following questions. show all …
1. The concentration of the $H_3AsO_4$ solution is $0.01421\ M$. 2. The molar mass of the diprotic acid is $118.7\ g/mol$.
-
application questions: answer the following questions. show all work fo…
The concentration of the NaOH solution is $0.200\ M$
-
malia was able to make a paperclip float on the surface of water. what …
Soap is a surfactant that disrupts the intermolecular forces of water making the paperclip sink.
-
recordatorio en español, muchas palabras que vienen del inglés se escri…
1. Vamos al teatro este fin de semana. 2. El cantante necesita un micrófono nuevo para el concierto. 3. Tomé una foto con mis amigos durante el viaje. 4. El profesor explicó la le…
-
experiment 3: titration, standardization, and molar mass determination …
$0.61\%$
-
part a: standardization of a dilute naoh solution. 1. chemical equation…
$0.0001746675$
-
write an equivalency statement relating picoliters and hectoliters. ref…
$1$ hectoliter $=1\times10^{14}$ picoliters or $1$ hL $=1e14$ pL
-
write an equivalency statement relating nanograms and dekagrams. refere…
\(1\ dag = 1e10\ ng\)
-
part a: standardization of a dilute naoh solution. 1. chemical equation…
$KHC_8H_4O_4+NaOH = KNaC_8H_4O_4 + H_2O$
-
write an equivalency statement relating amperes and milliamperes. refer…
$1\ A = 1\times10^{3}\ mA$
-
atomic structure quiz cp chemistry a 0 / module 3: the atom 4. which ob…
The beam of particles in the cathode ray tube was deflected away from the negatively charged magnet.
-
snc2p chemistry name: ephi topic 5: counting atoms 1. the ______ of an …
1. chemical symbol; 1 2. subscript; atoms; 2 3. parenthesis; 1; 2; 2; 1; 2; 8 4. coefficient; atoms; 3
-
snc2p chemistry 1. the ______ of an element represents one atom of that…
1. symbol; 1 2. sub - script; atoms; 2 3. bracket; 1; 2; 2; 1; 2; 8 4. coefficient; atoms; 3 5. coefficient; chemical formula; molecules; 3; 6 hydrogen and 3 oxygen; 2; 2 calcium,…
-
snc2p chemistry you should become very familiar with this table: |prefi…
| Prefix | Number | Example (formula) | | ---- | ---- | ---- | | mono | 1 | carbon monoxide (CO) | | di | 2 | carbon dioxide ($CO_2$) | | tri | 3 | sulfur trioxide ($SO_3$) | | te…
-
snc2p chemistry name: ephi topic 5: counting atoms 1. the ____ of an el…
1. chemical symbol; 1 2. subscript; atoms; 2 3. bracket; 1; 2; 2; 1; 2; 8 4. coefficient; atoms; 3 5. Coefficient; chemical formula; molecules; 3; 9; 2; 12
-
16 formula 1 point an element with a mass of 14 has an atomic number of…
10
-
10 formula 1 point an atom has 8 protons, 8 electrons, and 8 neutrons. …
10. 16 11. 18
-
which choice below best shows the sequence of events in the treatment o…
1. Filter to remove large solids like paper. 2. Settle to separate organic solids. 3. Filter to remove smaller particles. 4. Disinfect.
-
question 2 / 2 how have we been representing or drawing water? a. as tw…
B. As two hydrogen atoms connected to one oxygen atom, often in a “V” shape.
-
question 1 / 2 what is waters chemical formula? a. co₂ b. h₂o c. o₂h d.…
B. H₂O
-
formula 1 point a neutral atom has a mass of 15 and an atomic number of…
7
-
what did we figure out last class about bonding? what happens when atom…
When atoms bond, electrons are either shared (in covalent bonding) or transferred (in ionic bonding) to achieve a more stable electron - configuration.
-
7. how are the separation methods for homogeneous and heterogeneous mix…
B. A homogeneous mixture could be separated through distillation, while a heterogeneous mixture could be separated through filtration.
-
19 multiple choice 1 point what charge do protons have? positive neutra…
19. A. Positive 20. C. Burning wool
-
question 10 / 10 a molecule can have polar bonds but be nonpolar overal…
D. A symmetrical molecular shape.
-
17 multiple choice 1 point which of the following is a physical change?…
17. Water freezing 18. Candle burning
-
based on the periodic table of electronegativity in the slides, which o…
B. A bond between Hydrogen (H) and Oxygen (O)
-
question 3 what does the existence of helium hydride prove? it proves t…
It confirms our current understanding of the early universe
-
question 7 / 10 according to the presentation/simulation, mineral oil i…
B. Weak attractions between its molecules
-
which type of sedimentary rock is formed from remains of plants and ani…
D. organic
-
question 6/10 in a water molecule, why are the charges on the oxygen an…
D. Because the electrons are shared unequally, not completely transferred from one atom to another.
-
what are elements that lose electrons and form positive ions classified…
D. metals
-
question 5 / 10 what is the key difference between the ionic bond in sa…
C. lonic bonds form fully charged ions through the transfer of electrons, while covalent bonds involve the sharing of electrons.
-
question 2 why is helium hydride a finicky molecule? stars are made out…
Helium does not want to combine with other atoms.
-
question 4 / 10 water has a boiling point of 100.c, while methane (ch4)…
B. The attractions between water molecules are much stronger than those between methane molecules.
-
multiple choice 1 point. which of the following is an example of a homo…
Tap water
-
unit test: composition of the earth mid - unit test - part 1 what is a …
B. Bauxite is a mineral, coal is not.
-
how do water molecules effectively dissolve an ionic salt like sodium c…
D. Water's partial positive hydrogen ends attract the negative chloride ions (Cl−) and its partial negative oxygen end attracts the positive sodium ions (Na+).
-
question 27 of 10 which statement best explains why a water molecule (h…
A. The oxygen atom is more electronegative than the hydrogen atoms, and the molecule has an asymmetrical, bent shape.
-
question 1 / 10 what does the electronegativity of an atom represent? a…
B. The atom's ability to attract electrons toward itself within a chemical bond.
-
12 multiple choice 1 point what element has an atomic number of 14? sil…
Silicon
-
multiple choice 1 point changing the number of ? in atom causes the ele…
B. Protons
-
use your model above to try to explain why liquids like mineral oil or …
Mineral oil is non - polar and cannot interact well with ionic salts. Acetone, though polar, has weaker intermolecular forces than water and cannot effectively dissolve salts. Als…
-
9. match the descriptions with the terms. found in the top row of the i…
1. Lanthanides 2. Molecules 3. Synthetic compounds 4. Atomic numbers 5. Chemical bonds
-
4 multiple choice 1 point which of the following is a compound? cu mg l…
C. LiCl
-
reacting strongly with other elements, ____ explode easily. alkali meta…
A. alkali metals
-
19. choose the best answer. used in electronic devices, ____ conduct el…
19. D. semiconductors 20. B. metalloids
-
which subatomic particle does not have a mass of approximately 1 amu? h…
C. Electrons
-
how can you tell that two elements have many properties in common? they…
B. They are listed in the same vertical column or group.
-
organic compounds, such as sugar, contain the element ____. carbon nitr…
A. carbon
-
____ can be easily shaped and stretched, and easily conduct heat and el…
A. Metals
-
which model uses colored balls and rods to show bonds in a molecule? do…
B. ball - and - stick model
-
the _____ do not conduct heat very well, include noble gases and haloge…
B. nonmetals
-
which answer completes the chart? atomic number 26 fe ????? element nam…
D. chemical symbol
-
the largest group on the periodic table, ____, includes radioactive ele…
transition metals
-
which element reacts easily with other elements and is the only one tha…
A. hydrogen
-
the inner transition series are the _____ the periodic table. metalloid…
two bottom rows that are cut off from
-
what does a chemical formula contain? it contains chemical symbols that…
It contains chemical symbols that represent the elements and the numbers of atoms within a compound.
-
a ____ forms when elements are chemically combined, and it cannot be br…
D. compound
-
6. choose the best answer using the table. chemical compounds compound …
C. $H_2O_2$
-
3. sodium metal reacts violently with water and chlorine is a poisonous…
The properties of compounds are different from the properties of the elements that form the compounds.
-
the nonmetal ____ rarely combine with other elements.alkali metalssemic…
C. noble gases
-
2. which of the following are examples of physical changes? select all …
Ice melting, Acetone evaporating
-
who first arranged the periodic table that groups similar elements toge…
B. Dmitri Mendeleev
-
what elements are in nacl? chlorine and sodium nickel and carbon iobium…
chlorine and sodium
-
which formula shows copper dichloride? cucl₂ nacl kcl co₂
A. CuCl₂
-
how many atoms are in mgco₃? 5 4 3 6
A. 5
-
physical and chemical properties and changes quiz cp chemistry a o / mo…
The cake would be considered a product. Flour, sugar, eggs, and baking powder would be considered reactants.
-
what is the missing coefficient to make a balanced equation? c + ?s → c…
The coefficient of $S$ is 2 and the coefficient of $CS_2$ is 1. So the answer for the missing coefficient of $S$ is 2.
-
what is the missing coefficient to make a balanced equation? ?c + ?s → …
1
-
what is the missing coefficient to make a balanced equation? n₂ + ?k → …
The coefficient of $K$ is 6 and the coefficient of $K_3N$ is 2.
-
what is the missing coefficient to make a balanced equation? ?n₂ + k → …
1
-
what is the missing coefficient to make a balanced equation? p₄ + 3o₂ →…
C. 2
-
what is the missing coefficient to make a balanced equation? ?p₄ + o₂ →…
1
-
respond to all 3 what makes a bond polar? what makes a molecule polar? …
What makes a bond polar: A difference in electronegativity between the bonded atoms. What makes a molecule polar: Polar bonds and a molecular geometry where bond dipoles do not ca…
-
what is the missing coefficient to make a balanced equation? ?k + ?o₂ →…
4, 1, 2
-
what is the missing coefficient to make a balanced equation? o₂ + 2c → …
D. 2
-
what is the missing coefficient to make a balanced equation? o₂ + ?c → …
2
-
what is the missing coefficient to make a balanced equation? ? o₂ + c →…
1
-
what is the missing coefficient to make a balanced equation? 4na + o₂ →…
A. 2
-
what is the missing coefficient to make a balanced equation? 4na + ?o₂ …
1
-
what is the missing coefficient to make a balanced equation? ? na + o2 …
4
-
what law is shown by the balanced equation? 2h₂ + 1o₂ → 2h₂o newtons fi…
Conservation of Mass
-
balance the following equation: ?h₂ + o₂ → h₂o remember: the number of …
2, 1, 2