化學
化學反應、化學計量、分子結構與元素性質。
-
what is the hybridization of the central atom in the iodine trifluoride…
$sp^{3}d$
-
question 6 of 8 phosphoric acid is a triprotic acid with the pkₐ values…
mass $NaH_2PO_4 = 0.399\ g$ mass $Na_2HPO_4 = 0.947\ g$ $H_3PO_4$ and $Na_2HPO_4$
-
tag all the carbon atoms with pi bonds in this molecule. if there are n…
Tag both carbon atoms.
-
6. which of these elements are nonmetals? (a) bromine, br (b) carbon, c…
A. bromine, Br B. carbon, C E. phosphorus, P
-
answer the questions in the table below about the shape of the carbon d…
How many electron groups are around the central carbon atom? 2 What phrase best describes the arrangement of these electron groups around the central carbon atom? Linear
-
1. read a discussion of spectrophotometry in the literature. 2. explain…
1. The molar concentration of glucose in the stock solution is $0.0555\ M$. 2. | stock glucose, mL | concentration of glucose complex, M | % T | A | |---|---|---|---| | 5.00 | - |…
-
answer the questions in the table below about the shape of the nitrosyl…
How many electron groups are around the central nitrogen atom? 3 What phrase best describes the arrangement of these electron groups around the central nitrogen atom? Trigonal pla…
-
which statement describes why water has the unique ability to adhere to…
C. Adhesion causes the water molecule to be attracted to the glass.
-
what is the name of the attraction that forms hydrogen bonds between ne…
B. cohesion
-
answer the questions in the table below about the shape of the xenon di…
How many electron groups are around the central xenon atom? 5 What phrase best describes the arrangement of these electron groups around the central xenon atom? trigonal bipyramid…
-
which property describes water’s attraction to other molecules? (1 poin…
B. adhesive forces
-
oil, fat, and wax are unable to dissolve in water even though water is …
They are nonpolar molecules.
-
farming helps many people earn a living, but it also presents challenge…
- "Overfarming can cause the soil to lose nutrients. To continue to grow crops, farmers must use chemical fertilizers, which can be toxic." matches "One piece of land is used to g…
-
what are the hybrid orbitals of the carbon atoms in the following molec…
$sp^2$, $sp^3$
-
which statement describes the relationship between temperature and the …
Increasing the temperature causes the molecules to move faster.
-
ocean water is a solution. which describes the function of water in the…
It is the solvent.
-
which of the equalities is true when the ph is 4.22? h₃a = h₂a⁻ h₃a = h…
$\mathrm{[H_2A^ -]=[HA^{2 -}]}$
-
megan is an advanced diver. when diving deeper, what should she remembe…
Solubility increases with pressure.
-
when frozen ice cream melts, the atoms in the ice cream move further ap…
A. move further apart
-
what is one difference between water and ice? ice is more compressed th…
D. Water molecules move more easily than ice molecules.
-
using the vsepr model, predict the molecular geometry of the polyatomic…
tetrahedral
-
predict the geometry for cbr4. select the single best answer. bent octa…
tetrahedral
-
the n₂f₂ molecule can exist in either of the following two forms: part …
$sp^2$
-
question the freezing point of methanol is -97.6°c. what is the freezin…
$-143.7^{\circ}F$
-
studying informational text unit test \a walk through the rainbow with …
"chemicals produced by humans"
-
given this table of electronegativities: | atom | electronegativity | |…
$CO_2<NI_3<CO<HF$
-
2. what is the % composition of cl and in nacl? % composition = atomic …
2. $\%$ Cl in NaCl $\approx$ 60.66% 3. $\%$ Cl in KCl $\approx$ 47.55% 4. NaCl has a higher % Cl because the molar mass of Na is less than that of K, resulting in a smaller molar …
-
36 which of the following can be separated from one another? (1 p mixtu…
# Explicación breve: Los elementos son sustancias puras que no se pueden descomponer en otras sustancias más simples por métodos físicos. Los compuestos son sustancias puras forma…
-
35 vinegar and baking soda mix together. the solution bubbles as carbon…
A. A gas forms.
-
physical vs. chemical edition directions: put a star (%) or a check (✓)…
Density: Physical Property Flammability: Chemical Property Wood burning resulting in a pile of ash: Chemical Change Reactivity: Chemical Property An iron nail rusting: Chemical Ch…
-
using the vsepr model, predict the electron domain geometry and the mol…
Part 1 of 4 SO₂ Electron Domain Geometry: Trigonal planar Molecular Geometry: Bent Part 2 of 4 SF₆ Electron Domain Geometry: Octahedral Molecular Geometry: Octahedral
-
scheme means : an inherited pattern of thought or action a preliminary …
B. a preliminary plan
-
polar vs non - polar please sort the terms and examples below into two …
Polar: Ionic Compounds Can Dissolve in a polar solution, Phosphate Heads, Hydrophilic, O - H bond, Water, Glucose (C₆H₁₂O₆), Proteins, Salt (NaCl) Non - Polar: Hydrocarbon Tails, …
-
instructions: put a star (*) or a check (✓) in the correct column to cl…
| Example | Physical Property | Physical Change | Chemical Property | Chemical Change | | ---- | ---- | ---- | ---- | ---- | | Density | X | | | | | Flammability | | | X | | | Woo…
-
scheme has the same or almost the same meaning as: outline attitude ben…
A. outline
-
3. explain and show why ch₃f is a polar molecule, while cf₄ is not. ove…
CH₃F is polar because the bond dipoles do not cancel out due to its non - symmetric structure with a highly polar C - F bond. CF₄ is non - polar as the symmetric tetrahedral arran…
-
is the study of organic compounds—the compounds that contain carbon. in…
50%
-
describe the hybridization state of aluminum in aluminum trifluoride (a…
$sp^{2}$
-
4. when sugar is mixed into tea, which property of the sugar stays the …
Chemical composition (assuming mass is not among the options, if mass is an option, mass also stays the same in a closed - system context as no sugar is added or removed during th…
-
data table 2: mass and volume data for unknown samples a chemistry stud…
| Sample | Volume of sample (mL) | Density (g/mL) | | ---- | ---- | ---- | | 1 | 10.20 | 4.93 | | 2 | 12.70 | 5.00 | | 3 | 11.33 | 5.09 | | 4 | 11.11 | 4.98 | | 5 | 15.00 | 4.99 |…
-
think it over 6. identify the property of water that makes water a good…
Water's polarity and ability to form hydrogen - bonds.
-
applying scientific methods a chemistry student is given the task of an…
Sample A: $8.06\ g/mL$ Sample B: $8.84\ g/mL$ Sample C: $7.24\ g/mL$
-
applying scientific methods a chemistry student is given the task of an…
Sample A: 8.06 g/mL Sample B: 8.84 g/mL Sample C: 7.24 g/mL
-
consider the atoms that are bonded to two or more other atoms. highligh…
Highlight the oxygen in the $-O - CH_3$ group and the carbon attached to the carbonyl, aromatic ring and methyl group in blue (for $sp^{3}$ hybridization). Highlight the carbon at…
-
which statement about atoms is correct? a) atoms are the building - blo…
- For the atom question: a) Atoms are the building blocks of all matter. - For the gold question: a) It is made of only one type of atom. - Question 1: B. They are tightly packed …
-
how many atoms are in 6.3 mol zn? 3.8x10^24 atoms zn 410 atoms zn 1.0x1…
3.8×10²⁴ atoms Zn
-
which of the following substances is made up of only one type of atom? …
b) Carbon (C)
-
what is the difference between an atom and a molecule? a) an atom is ma…
1. c. A molecule is formed when two or more atoms bond together. 2. d. A molecule is made up of atoms that are chemically bonded. 3. b. Silver (Ag)
-
how many atoms are in 6.3 mol zn? 3.8x10^24 atoms zn 410 atoms zn 1.0x1…
A. $3.8\times 10^{24}$ atoms Zn
-
how many atoms are in 6.3 mol zn? 3.8x10^24 atoms zn 410 atoms zn 1.0x1…
A. $3.8\times 10^{24}$ atoms Zn
-
which has more molecules? 1 mole nacl 1 mole h₂o 1 mole al(oh)₃ there a…
D. There are all the same
-
how many atoms of iodine are in a mole of iodine? 126.9 63.55g 6.02×10²…
C. $6.02\times 10^{23}$
-
what is the molar mass of c2h4o2? 60g 50g 68g 40g
A. 60g
-
how many water molecules are in 5.2 moles of water? 5.2 molecules 3.1 x…
B. $3.1\times 10^{24}$ molecules
-
table 2.4 common non - metal ions element name element symbol ion symbo…
1. Ionic compounds are named with metal first and non - metal with “-ide” ending (and Roman numerals for metals with variable oxidation states). 2. - a. Sodium bromide - b. Lithiu…
-
6/25 what is avogadros number? 6.02×10⁻²³ 6.02×10²³ - 6.02 10²³ 6,020,0…
B. $6.02\times 10^{23}$
-
3. write the chemical formula for a compound that is made of one atom o…
3. $CH_4$ 4. $N_2O_4$
-
2. how can metal elements achieve a stable electron - shell structure l…
2. By losing electrons to form positive ions. 3. By gaining electrons to form negative ions or sharing electrons through covalent bonds.
-
3. write the chemical formula for a compound that is made of one atom o…
1. $CH_4$ 2. $N_2O_4$ 3. Helium has 2 electrons in its outermost shell. Other noble - gas elements (except helium) have 8 electrons in their outermost shell. The first shell of he…
-
question 4 if the δg of the reaction that changes diamonds to graphite …
B. spontaneous and exergonic
-
what is the chemical name of a greenhouse gas that contains carbon and …
c. Carbon dioxide
-
question 2 what is the relationship between δg of a reaction and the ra…
A. There is no relationship
-
get it? 5. distinguish between solutions and suspensions.
Solutions are homogeneous mixtures with small - sized solute particles that don't settle. Suspensions are heterogeneous mixtures with larger particles that settle over time.
-
what is the chemical name of a greenhouse gas that contains carbon and …
c. Carbon dioxide
-
what are the primary sources of methane in the atmosphere? select all t…
a. Plant materials decomposing b. Biochemical processes in stomachs
-
which reaction is exothermic? a reaction that does not involve a change…
a reaction that releases energy into the environment
-
consider the atoms that are bonded to two or more other atoms. highligh…
Highlight carbon atoms in aromatic rings and carbonyl carbon in green. Highlight methyl - attached carbon and the carbon between aromatic ring and carbonyl in blue. No non - hydro…
-
how does a catalyst influence a chemical reaction? it speeds up or slow…
It speeds up or slows down a chemical reaction by direct participation.
-
which component is affected when a catalyst is added to a chemical reac…
the activation energy
-
how does a catalyst work? by increasing the temperature of a chemical r…
by decreasing the activation energy of a reaction
-
what is the hybridization state of si in sih4? select the single best a…
For the first question: $sp^3$ For the second question: $sp^3$
-
which statement correctly describes a chemical reaction? reactants come…
Bonds between atoms break and reform.
-
predict the geometries of the following ion. so₄²⁻ part 1 of 2 electron…
Part 1 of 2 Electron Domain Geometry: tetrahedral Part 2 Molecular Geometry: tetrahedral
-
using the vsepr model, predict the molecular geometry of xef4. select t…
square planar
-
a substance that influences the reaction but does not participate in th…
catalyst
-
use the vsepr method to predict the molecular geometry of hgcl₂. select…
linear
-
which statement best describes the amount of catalyst that remains at t…
The amount of catalyst is the same at the end as at the beginning of the reaction.
-
is the molecule polar or nonpolar? select the single best answer. polar…
Nonpolar
-
a researcher is designing a laboratory experiment to determine whether …
First, he should measure how long it takes for the liquid to become clear if X and Y are mixed together. Then, he should measure how long it takes if he also adds substance A to X…
-
a chemist mixes 200 milliliters of a solution that is 55% acid with 425…
(a) 535 milliliters (b) 85.6%
-
which reason best explains why carbon is able to form macromolecules? c…
Carbon can bond with many elements.
-
what is the primary function of the carbon cycle? creating fossil fuels…
recycling the supply of carbon on Earth
-
17. 5.00 l of a gas contains 0.965 mol. if the amount of gas is increas…
$9.33\ L$
-
3.00 l of a gas contains 0.965 mol. if the amount of gas is increased t…
$5.60\ L$
-
which molecule or ion has a trigonal pyramidal molecular geometry? a) o…
e) $SeO_3^{2 - }$
-
4. contrast identify a difference between the covalent bonds within a w…
Covalent bonds within a water molecule are intramolecular and formed by electron - sharing between atoms, while hydrogen bonds between water molecules are intermolecular and are w…
-
which molecule has a t - shaped molecular geometry? a) ncl3 b) icl3 c) …
B. $ICl_3$
-
question 3 (1 point) what is the best lewis structure for oncl? (a) :o—…
d) d
-
take a look 3. circle each water molecule in this diagram. remember, a …
4
-
question 4 (1 point) listen draw the lewis structures and then identify…
B. SF₆
-
how many electron domains are around the central tin atom in sncl2? 6 4…
3
-
question 6 (1 point) which statement accurately reflects the informatio…
d) VSEPR theory predicts molecular shape by accounting for the influence of lone pairs.
-
question 7 (1 point) listen what hybridization does a ch₄ tetrahedral c…
A. $sp^3$
-
what is the formal charge for the s in the following compound? h h—c—s—…
B. 0
-
think it over 2. identify what is held together by van der waals forces…
B. molecules
-
before you read have you ever stirred a spoonful of a powdered drink in…
When a spoonful of powdered drink is stirred into water, the powder dissolves in the water. The individual powder particles separate and become evenly distributed throughout the w…
-
chemical formula: a group of letters and subscript numbers that represe…
1a) The subscript indicates the number of atoms of the element it follows in one - molecule of the compound. 1b) It means there is 1 atom of that element in one molecule of the co…
-
question 9 (1 point) listen which bond angle is the largest? a) h - si …
C. \(O - C - S\) in \(COS\)
-
how many valence electrons are in the molecule, c₂h₇n. a) 20 b) 30 c) 2…
A. 20
-
take a look 5. label the first energy level and second energy level in …
First energy level (K - shell): 2 electrons to fill. Second energy level (L - shell): 8 electrons to fill.