化学
化学反应、化学计量、分子结构与元素性质。
-
what property causes covalent compounds to be brittle? strong metallic …
weak intermolecular forces
-
10. which of these is an example of a molecule? a. oxygen-o₂ b. salt-na…
1. Element 2. M 3. C 4. A 5. Element
-
what is required for a substance to be conductive? they must contain co…
They must contain ions.
-
score: —/20 part a: multiple choice (1 point each) choose the best answ…
1. b. Atom 2. c. Iron 3. b. Molecule 4. c. Oxygen (\(O_2\)) 5. b. Atoms 6. b. Some molecules are not compounds. 7. b. A compound 8. b. Mixture 9. b. Made of one type of atom
-
part 2: signs of a chemical reaction check (√) the box if the observati…
- **Part 2**: - Color change: Yes - Temperature change (hot or cold): Yes - Gas produced (bubbles, fizzing): Yes - Solid forms in liquid (precipitate): Yes - Ice melting: No - Sug…
-
data and equations: 1. write the chemical formula for each of the chemi…
| Chemical Name | Salt | Cation | Anion | | --- | --- | --- | --- | | Ammonium carbonate | \((NH_4)_2CO_3\) | \(NH_4^+\) | \(CO_3^{2 -}\) | | Magnesium perchlorate | \(Mg(ClO_4)_2…
-
in a laboratory, emma poured a chemical down the drain. while doing so,…
She feared that people would discover why she got an injury.
-
14. tasks least likely to be performed by collection system personnel i…
14. a. Making water connections 15. c. Lower explosive level alarm activates 16. c. Chlorine 17. d. Backflow valve 18. a. Spring blades 19. d. None of the above 20. d. Pipe cracks
-
complete the text with the correct pair of words. could you — these wat…
bring...to; take...a part
-
1. please name the following compounds: a. b. c. d. e. 2. please identi…
1. - a. 2,2 - dimethyl - 4 - heptanol - b. 1 - methyl - 1 - cyclopentanol - c. 1 - chloro - 5 - pentanol - d. isopropyl propyl ether - e. 2 - methyl - 4 - hexanethiol 2. - Alcohol…
-
pbf: benefits and limitations use the information below to answer the q…
The prints are dense.
-
what should you do with chemicals after completing your lab work? retur…
Dispose of chemicals according to your lab teacher’s instructions.
-
what is the relationship between dissolved substances and water molecul…
Dissolved substances interact with water molecules, creating unique properties
-
what is surface tension? a force that separates molecules in a liquid a…
A force that pulls adjacent parts of a liquid's surface together.
-
based on the molecular structures provided, which substance is likely t…
Glycerol
-
determine the equilibrium constant for a reaction at 200 k if (delta g^…
$1.7\times 10^{-7}$
-
determine the equilibrium constant for a reaction at 200 k if \\( \\del…
$1.8\times 10^{-7}$
-
at a particular temperature, the solubility of in₂(so₄)₃ in water is 0.…
The new solubility of $\ce{In2(SO4)3}$ is approximately $6.9\times 10^{-4}\ M$.
-
at a particular temperature, the solubility of in₂(so₄)₃ in water is 0.…
The new solubility of $\text{In}_2(\text{SO}_4)_3$ is $7.9\times 10^{-5}\ M$
-
at a particular temperature, the solubility of in₂(so₄)₃ in water is 0.…
$2.0\times 10^{-10}$
-
what is the solubility of la(io₃)₃ in a solution that contains 0.300 m …
The solubility of $\text{La(IO}_3\text{)}_3$ is $2.78\times 10^{-10}\ M$.
-
what is the solubility of ca(oh)₂ in 0.480 m ba(oh)₂? k_sp for ca(oh)₂ …
The solubility of \(Ca(OH)_2\) is approximately \(7.05\times 10^{-6}M\)
-
what is the solubility of mgco₃ in a solution that contains 0.070 m mg²…
The solubility of \(\ce{MgCO_{3}}\) is \(5.0\times 10^{-7}\space M\)
-
fill in the missing atoms or groups to complete the structure of 2,2 - …
From left to right (top - bottom for the first carbon): - First carbon (top and bottom): \(H\) (two \(H\) atoms) - Second carbon (top and bottom): \(Cl\) (two \(Cl\) atoms) - Thir…
-
identify the name of carboxylic acid shown below: select the correct an…
3 - chloro - 2 - methylbutanoic acid.
-
a solution prepared in the lab contains $3.5\times10^{-4}m sr^{2+}$ and…
No, a precipitate will not form.
-
what is the name of the compound given below? pcl₅ phosphorous pentachl…
phosphorous pentachloride
-
what type of compound is given below? pcl₅ acid covalent ionic
B. covalent
-
what is the solubility of cd₃(po₄)₂ in water? (ksp of cd₃(po₄)₂ is 2.5×…
The solubility of $\ce{Cd3(PO4)2}$ in water is $1.2\times 10^{-7}\ \text{mol/L}$.
-
based on the information in the table, which two elements are most like…
Bismuth and nitrogen, because they have the same number of valence electrons.
-
what is the name of the compound given below? mg3n2 magnesium nitrogen …
magnesium nitride
-
what is the solubility of cd3(po4)2 in water? (ksp of cd3(po4)2 is 2.5 …
The solubility of $\ce{Cd3(PO4)2}$ in water is approximately $1.6\times 10^{-7}\text{ mol/L}$.
-
what type of compound is given below? mg3n2 ionic acid covalent
ionic
-
fill in the missing atoms or groups to complete the structure of 2 - ch…
From left - to - right and top - to - bottom in the boxes: \( -Cl\), \( -CH_3\), \( =O\), \( -OH\)
-
while looking at calcium (ca) on the periodic table, a student needs to…
directly to the right
-
what is the name of the compound given below? cr(no3)3 chromium(iii) ni…
chromium(III) nitrate
-
what type of compound is given below? cr(no3)3 acid ionic covalent
ionic
-
what is the formula of the compound given below? hydrofluoric acid hfi …
B. HF (aq)
-
on blue ground at first, moxeko was quite excited when his school annou…
B. The field trip is a learning experience for Moxeko.
-
on blue ground at first, movoko was quite excited when his school annou…
D. However, secretly he couldn't wait to encounter an Earth puddle and analyze its bizarre properties.
-
fill in the missing atoms or groups to complete the structure of 3,4 - …
From left to right (including the double - bonded box): \( -OH \), \( =O \), \( -CH_3 \), \( -Br \), \( -Br \), \( -H \), \( -H \)
-
on blue ground at first, moxeko was quite excited when his school annou…
d. He has limited understanding about water on Earth.
-
the element phosphorus is located to the right of the element magnesium…
Phosphorus has a larger atomic mass.
-
identify the name of the carboxylic acid derived from an alkane with on…
methanoic acid
-
based on the information in the table, which elements are most likely i…
Boron and carbon are likely together in one period because they each end in “-on,” while aluminum, gallium, and germanium are likely together in another period because they each e…
-
question identify the name of the carboxylic acid derived from alkane w…
hexanoic acid
-
what type of compound is given below? hydrofluoric acid acid covalent i…
acid
-
what is the formula of the compound given below? dinitrogen tetroxide 2…
\(N_2O_4\) (the second option in the given choices)
-
what type of compound is given below? dinitrogen tetroxide covalent aci…
covalent
-
identify the name of the carboxylic acid derived from alkane butane. se…
butanoic acid
-
a seven - carbon carboxylic acid is called which of the following? sele…
heptanoic acid
-
13 ai aluminum 26.982 atomic number atomic mass chemical symbol chemica…
- atomic number: \(13\) - atomic mass: \(26.982\) - chemical symbol: \(Al\) - chemical name: Aluminum
-
which of these elements has an atomic number of 14? 5 b boron 10.811 6 …
Si
-
the outermost electrons in an atom are called - orbital electrons. clou…
valence electrons.
-
identify the name of the carboxylic acid derived from propane. select t…
propanic acid
-
based on the periodic table, how many protons are found in an atom of i…
26
-
an ion is an atom with a charge. ions are charged because there is a di…
C. electrons
-
an isotope of an element is the same element (same atomic number) but w…
neutrons.
-
how many carbons are there in the main chain of the compound 2 - hydrox…
4
-
another balancing equations sheet! balance these equations! 1) ____ alb…
1. \(1\) \(AlBr_3 + 3K = 3KBr+1\) \(Al\) 2. \(1\) \(FeO + 1\) \(PdF_2=1\) \(FeF_2+1\) \(PdO\) 3. \(1\) \(P_4 + 6Br_2 = 4PBr_3\) 4. \(2\) \(LiCl+1\) \(Br_2 = 2LiBr+1\) \(Cl_2\) 5. …
-
how do architects use math to ensure that their buildings are not just …
The question encourages the reader to challenge preconceptions they might have about math being irrelevant to standards of beauty.
-
balancing chemical equations refer to page for detailed instructions on…
1. \( 2\text{NI}_3 ightarrow\text{N}_2 + 3\text{I}_2 \) 2. \( \text{Fe}_2\text{O}_3 + 6\text{HCl} ightarrow2\text{FeCl}_3+3\text{H}_2\text{O} \) 3. \( 3\text{Zn}+\text{Cu}_3\text{…
-
question identify the name of the carboxylic acid derived from an alkan…
A. methanoic acid
-
identify the name of carboxylic acid shown below: select the correct an…
3-chloro-2-methylbutanoic acid
-
choose the option below that is a characteristic of ketones. select the…
The functional group of this type of compound must always be in the middle of a carbon chain.
-
question what is the iupac name for ch₃ch₂ch₂c(o)ch₂ch₂ch₂ch₃? select t…
octanone
-
question which of the following is the formula for the simplest ketone?…
C. \( \text{CH}_3\text{COCH}_3 \)
-
question ethanol (ch₃ch₂oh) has a higher boiling point than dimethyl et…
D. less polar
-
what is the common name for ch₃ch₂och₂ch₃? select the correct answer be…
dietyl ether
-
question an ether is described by which of the following? select the co…
An ether is an organic compound with an oxygen atom bound to two carbon atoms.
-
question 7 of 10 how many carbon (c) atoms are in a molecule of ch₂o? a…
D. 1
-
lc2 digital questions balanced the equation: na + o₂ → na₂o this is an …
The balanced equation: \(4Na + O_2 ightarrow 2Na_2O\) The reaction is a synthesis reaction.
-
question phenol is slightly soluble in water. why? select the best choi…
C. The (-OH) group can form hydrogen bonds with water molecules.
-
predict the relationship between the melting points and boiling points …
Both the melting and boiling points of phenol are higher than that of toluene.
-
skeletal equation: ( h_2o(l) ightarrow h_2o(g) ) label the parts of the…
For the first equation (\(H_2O(l)\to H_2O(g)\)): - Left - hand side box (reactants): \(H_2O(l)\) - Right - hand side box (products): \(H_2O(g)\) - Reaction type: physical For the …
-
question explain why ethanol has a higher boiling point than methanol. …
C. Ethanol has a longer carbon chain than methanol.
-
when a chemical equation is balanced, this means that the type and numb…
the same as
-
in a chemical reaction, the products have chemical properties compared …
different
-
environments. ve activity: wax paper and water drops i - mcgraw to do: …
- water is polar and wax paper is nonpolar so they don't mix - hydrogen bonds give water this property that allowed it to move the way it did on the wax paper - electrons are shar…
-
drag each tile to the correct box complete each analogy with the approp…
1. subsistence 2. precarious 3. abysmal 4. voracious
-
question 4 (1 point) calculate the % of sand if you had 6.85gm sand, 2.…
B. \(49.1\%\)
-
the complete combustion of methanol is as follows: 2ch₃oh(l) + 3o₂(g) →…
B. It is an exothermic reaction.
-
question 11 (4 points) classify each of the following as an element, a …
1. d. heterogeneous mixture 2. a. a homogeneous mixture 3. c. a compound 4. b. an element
-
which of the following alcohol structures is not a secondary alcohol? s…
\(CH_3 - CH_2 - CH_2 - OH\) (propan - 1 - ol)
-
question 6 (1 point) which of the following processes require(s) chemic…
d. Breaking a compound into its constituent elements.
-
3. which of the following statements describes how agricultural develop…
- Pesticides and other chemicals that boost crop growth can be dangerous if applied incorrectly. - Agriculture affects water supply when dry areas do not have enough to support cr…
-
is it possible to make a 49% solution of methanol in water? select the …
Yes, methanol a single - carbon alcohol, so it is completely miscible in water.
-
name the following structure. select the correct answer below: 2 - ethy…
3 - methyl - 3 - pentanol
-
question which iupac name is incorrect? select the correct answer below…
3 - butanol
-
give the iupac name for the following compound. select the correct answ…
1 - propanol
-
question 9 (1 point) which of the following is an incorrect description…
e. A heterogeneous compound
-
the ancient woman had lived alone in the cave by the sea for as long as…
They are both intrigued by science.
-
identify the name of the given alcohol. select the correct answer below…
2 - hexanol
-
which of the following processes is a chemical change? liquid nitrogen …
C. When a few drops of red food coloring are added to a beaker of hot water, the water immediately turns red
-
6) pure gold has a density of 5.0 g/cm3. how much space would a piece o…
6) $65\,\text{cm}^3$ 7) $\approx 16.7\,\text{mL}$ Tabla: | Liquid | Density | Letter | |----------------|-------------|--------| | Maple Syrup | $2.23\,\text{g/cm}^3$ | $D$ | | Ru…
-
question fill in the missing atoms or groups to complete the structure …
From left to right in the boxes: \(\boldsymbol{-OH}\), \(\boldsymbol{-H}\), \(\boldsymbol{-H}\), \(\boldsymbol{-H}\)
-
identify the name of the given alcohol. select the correct answer below…
3 - methyl - 2 - pentanol
-
question what do you name the derivatives of linear hydrocarbons in whi…
alcohols
-
75. gallium, which has an atomic mass of 69.723 amu, has two naturally …
El isótopo \(Ga - 69\) tiene una mayor abundancia. La abundancia del \(Ga - 69\) es aproximadamente \(63.85\%\) y la del \(Ga - 71\) es aproximadamente \(36.15\%\), ya que la masa…
-
question fill in the missing atoms or groups to complete the structure …
Top - left: $\text{CH}_3$, Top - right: $\text{OH}$, Bottom - left: $\text{H}$