化学
化学反応、化学量論、分子構造、元素の性質。
-
question 3. according to the diagram below, which rule is being violate…
Hund's rule
-
multiple choice questions answer the following multiple choice question…
1. C. Solute 2. D. The temperature of the water 3. D. Oil and water are made of different tiny parts that are not attracted to each other. 4. A. Because the tiny parts of some liq…
-
一.单选题(共20题,共40分) 6.the following chemicals except( ) should avoid conta…
C. water
-
二.多选题(共12题,共24分) 4.which of the following reagents are toxic? (2分) □a.h…
A. Hg, B. benzene, C. chloroform
-
一.单选题(共20题,共40分) 3.the translucent surface of the spectrophotometer cuv…
C. Lens paper
-
二.多选题(共12题,共24分) 2.precautions for chemicals storage include that().(2分…
A. forklifts must be equipped with fire shields when they enter chemical warehouses. B. various chemicals must be stored in categories C. waste chemical containers must be stored …
-
二.多选题(共12题,共24分) 1.how to deal with the burning of solvent or flammable…
A. Extinguish with fire extinguisher, C. Add sand for extinguishing, D. Cover the bottle with non - flammable tiles, glass sheets or rags
-
三.判断题(共18题,共36分) 42.for mercury objects splashed in the laboratory, the…
Correct
-
三.判断题(共18题,共36分) 39.the test waste must be concentrated and handed over…
Correct
-
一.单选题(共20题,共40分) 37.the following ( ) are not highly toxic chemicals. (…
D. formaldehyde
-
三.判断题(共18题,共36分) 25.the use of dangerous chemicals must strictly abide …
Correct
-
三.判断题(共18题,共36分) 20.when eyes are splashed with chemical reagents, they…
Correct
-
a lewis structure for the molecule benzene c₆h₆ is shown. based on this…
A. Nonpolar
-
mass: 3.00 g h₂o so₂ ru(co)₅ sf₆ cf₄ xef₄ molar mass 18.015 64.058 241.…
\(3.56\) (rounded to three significant figures)
-
now consider the number of atoms in the sample. what is the ratio numbe…
\(1\) (Since \(0.5\) is approximately \(\frac{1}{2}\), and if we consider the ratio as \(\frac{\text{number of S atoms}}{\text{number of SF₆ molecules}}\) and assume some possible…
-
a. h — c — cl | br b. select the correct answer below: the first molecu…
The first molecule (a) contains one chiral carbon, and the second molecule (b) contains three chiral carbons.
-
for each atom in the table below, write down the subshell from which an…
| atom | subshell from which electron removed to form +1 cation | subshell to which electron added to form -1 anion | |---|---|---| | Ar | \(3p\) | \(4s\) (forced - based on subsh…
-
re - order the list in the table below, if necessary, so that the atoms…
\(Cl^-\), \(Cl\), \(F\)
-
consider the following data for selenium: atomic mass: ( 78.96 \frac { …
- For reaction (1): absorb, yes, \(941.0\) - For reaction (2): release, yes, \(941.0\)
-
in this passage, which type of rhetoric is ms. dundum using? before the…
A. Ethos
-
which of the following pairs are not resonance structures? : \\( \\ddot…
The pair \(H-\ddot{O}-\underset{\underset{\ddot{O}}{||}}{P}-\ddot{O}-H\) and \(H-\ddot{O}-P-\ddot{O}-H\) (with the double - bonded \(O\) in a different position) are not resonance…
-
do now chemistry - date: directions: silently and independently answer …
This formula shows the relationship between the heat energy absorbed or released (\(q\)) by a substance, its mass (\(m\)), its specific heat capacity (\(C\)), and the change in it…
-
5. predict: if two elements produce the same color flame, what could he…
Atomic emission spectra (as they are unique to each element based on electron transitions), chemical reactivity (distinct reaction behaviors with other substances), and physical p…
-
how is chemical weathering best described? it is the build up of chemic…
The breakdown of rock by a change in its chemical composition.
-
question 1 how is mechanical weathering best described? the buildup of …
The breakdown of rock through mechanical disintegration and physical stress
-
f25 consider the structure below for the $eo_{2}f^{2 - }$ ion. note: e …
(a) \(-2\) (b) \(B\)
-
draw the most important lewis structure for the f₂o molecule and then a…
The formal charge of O is \(0\) and the formal charge of F is \(0\).
-
question 3 of 10 the reactants when fossil fuels are burned are shown b…
D. Carbon dioxide + water + heat
-
in a laboratory, emma poured a chemical down the drain. while doing so,…
A. She feared that people would discover why she got an injury.
-
example 3 apply the substitution method chemistry ms. washington is pre…
Ella debe usar aproximadamente \(x=\frac{1200}{7}\approx171.43\) mililitros de la solución \(3.5\%\) y \(y = \frac{900}{7}\approx128.57\) mililitros de la solución \(7\%\)
-
consider the structure below for the eof₂²⁻ ion. note: e represents an …
(a) \(+2\) (b) \(Se\)
-
f25 consider the structure below for the $eo_{2}f^{2 - }$ ion. note: e …
(a) \(-2\) (b) \(Al\)
-
for the phosphoric acid molecule (h₃po₄), all four oxygen atoms are bon…
a formal charge of zero and an expanded octet
-
draw the most important lewis structure for the f₂o molecule and then a…
| Atom | Formal Charge | | ---- | ---- | | O | 0 | | F | 0 |
-
which of the following are impacts of industrial discharge? select all …
Many chemicals released by industries are harmful to human health and well being. Discharge of industrial waste into water supplies can lead to communities needing to use differen…
-
43 which of the following statements correctly describes the steps in m…
Solids are removed via filtration and settlement tanks then microbes break down organic material followed by disinfection and removal of nutrients.
-
how can we test the hypothesis that bottled water has fewer chemicals t…
measuring the different levels of chemicals in samples of both bottled and tap water
-
what makes each element unique? multiple choice number of bonds formed …
physical and chemical properties
-
if you were tasked with treating contaminated water and needed a remedi…
Utilize microbes to breakdown toxins in the water.
-
which drug contains the chemical thc and affects specific receptors in …
marijuana
-
10. list 3 examples of energy changes in each of the following categori…
- **Endothermic Definition**: Process that absorbs heat. - **Endothermic Examples**: Melting ice, evaporating water, ammonium nitrate - water dissolution. - **Exothermic Definitio…
-
which is a source of water pollution? solid waste accumulation at a lan…
chemical waste discharged from an oil refinery
-
which is one method for detecting cancer? receiving radiation taking ch…
Doing proper self exams.
-
in 1970, a series of public policies were created to help reduce the ef…
An oil refinery directly channels chemical wastewater into surrounding man - made ditches.
-
if mercury (ii) oxide is heated and decomposes, what would the product …
\(Hg\)
-
predicting the products of a combustion reaction if nitrogen and hydrog…
\(CO\)
-
sora lives near a farm that performs aerial pesticide spraying every mo…
take off her shoes at the door before entering her home
-
noemi is writing an essay on organic foods. she wishes to include prope…
She could summarize the ideas from the source. She could paraphrase the ideas from the source. She could directly quote the ideas from the source.
-
simple chemical reactions online practice complete this assessment to r…
Potassium (K)
-
simple chemical reactions online practice complete this assessment to r…
-1
-
use the equation to answer the question naoh + feso₄ → na₂so₄ + fe(oh)₂…
\(2NaOH + FeSO_4 \to Na_2SO_4+Fe(OH)_2\) (the first option)
-
select all that apply what are two main reasons for tilling (the proces…
To remove weeds, To improve irrigation
-
which of the following processes occurs when a substance changes phase …
B. sublimation
-
general science which of the following is the ph of a neutral solution?…
C. 7
-
general science carbon - 14 is an example of an a isotope. b isobar. c …
A. isotope.
-
how many grams of solute are contained in each solution? be sure each o…
Part 1 of 2: \(106\space g\) Part 2 of 2: \(2310\space g\)
-
how many grams of solute are contained in each solution? be sure each o…
- Part 1 of 2: \(106\space g\) - Part 2 of 2: \(2310\space g\)
-
how many moles of solute are contained in each solution? be sure each o…
Part 1: $0.166\ mol$ Part 2: $0.875\ mol$
-
what is the molarity of a solution prepared using the given amount of s…
Part 1 of 2: \(1.3\space M\space NaOH\) Part 2 of 2: \(1.07\space M\space NaNO_3\)
-
what is the molarity of a solution prepared using the given amount of s…
- Part 1 of 2: $1.3\space M\space NaOH$ - Part 2 of 2: $1.07\space M\space NaNO_3$
-
how many moles of nacl are contained in each volume of aqueous nacl sol…
Part 1: \(2.1\space mol\) Part 2: \(0.17\space mol\)
-
a commercial rubbing alcohol contains 32. g of isopropanol and 0.250 g …
The weight - volume percent of isopropanol is \(62\%\text{ w/v}\) and the weight - volume percent of sucrose octaacetate is \(0.48\%\text{ w/v}\)
-
calculate the molarity of each aqueous solution with the given amount o…
Part 1 of 3: \(5.96\space M\) Part 2 of 3: \(0.129\space M\) Part 3 of 3: \(1.92\space M\)
-
which statements accurately describe groundwater? check all that apply.…
- Groundwater is water found below Earth’s surface. - Groundwater erosion leads to the creation of caves. - Groundwater can cause chemical weathering.
-
which describes the horizons in a soil profile? horizon a is mineral de…
Horizon O forms from organic material.
-
which factor contributes to both chemical and mechanical weathering? ab…
water
-
which describes a climate effect on the rate of weathering? cold climat…
Cold climates favor mechanical weathering.
-
soil classification is partially determined by the presence of organic …
a forest because it has more trees to provide plant litter, a forest because it has more animals to mix the soil
-
a geologist is studying a new soil profile. in analyzing the profile, s…
decomposed plant litter and weathered parent material
-
a farmer examines the soil of a new plot of land he just purchased. he …
humus
-
rank the following atoms in order of increasing ionization energy, from…
\(Si < P < S < F < Ne\)
-
rank the following atoms/ions in order of atomic radius from smallest t…
\(Sr^{2+}<Rb^{+}<Br^{-}<Se^{2 - }\)
-
rank the following atoms/ions in order of atomic radius from smallest t…
\(Sr^{2+}<Rb^{+}<Br^{-}<Se^{2-}\)
-
which of the following elements are paramagnetic in the ground state (f…
C. C, D. O, F. Cl, H. Fe
-
an element in its ground state has electron configuration: ne3s²3p⁴. wh…
\(S\)
-
using the drop down choices below, complete the ground state electron c…
\([Ar]4s^{2}3d^{8}4p^{0}\)
-
read this text. two phytochemicals in ginger—gingerol and shogaol—are s…
no, because the text with an ellipsis is no longer grammatically correct
-
a neutral atom has the following electron configuration: 1s²2s²2p⁶3s²3p…
\(\text{Ca}\)
-
fill in the information missing from this table: some electron shells s…
For shell \(3\): \(3s,3p,3d\); For shell \(4\): \(4s,4p,4d,4f\)
-
list these electron subshells in order of increasing energy. 4s, 3d, 4p…
\(3p<4s<3d<4p\)
-
complete the table below by filling in the principal quantum number $n$…
| subshell | principal quantum number \(n\) | angular momentum quantum number \(l\) | |---|---|---| | \(5p\) | \(5\) | \(1\) | | \(3d\) | \(3\) | \(2\) | | \(4f\) | \(4\) | \(3\) …
-
write the balanced net ionic equation for the reaction when alcl₃ and n…
$$2\mathrm{Al^{3 +}(aq)}+3\mathrm{S^{2 -}(aq)} ightarrow\mathrm{Al_2S_3(s)}$$
-
this energy diagram shows the allowed energy levels of an electron in a…
How many excited states are there? \(2\) How many lines are in the absorption line spectrum? \(2\) Which transition causes the absorption line at the shortest wavelength? \(A ight…
-
why do you sweat? put the process of a person sweating in order, from b…
2. Sweat comes out of your pores. 3/4 (exothermic). Your body is giving off heat. 3/4 (endothermic). The sweat evaporates. 5. Your body cools down.
-
it takes 242 kj/mol to break a chlorine - chlorine single bond. calcula…
\(495\space nm\)
-
question all of the following are true of coronary artery disease (cad)…
It is the second leading cause of death of men and women in the United States, behind cancer.
-
when manas friend mentioned an upcoming concert, mana quickly thought a…
A. semantic network
-
the arcade looked nothing like how cory had imagined. it did not match …
D. schema
-
the function of platelets includes which of the following? the transpor…
All of the listed responses are correct.
-
mn₂s₃ express your answer as an ion. a chemical reaction does not occur…
\(2Mn^{3 +}+3S^{2 -}\)
-
which occurs during digestion? the mouth only allows for physical diges…
Physical digestion prepares the food for chemical digestion.
-
which is the role of the gall bladder? ○ to provide physical digestion …
to store the liquid produced by the liver
-
identify the more polar bond in each of the following pairs. match the …
When comparing \(Si - S\) and \(Si - Cl\), \(Si - S\) has a less polar bond than \(Si - Cl\). When comparing \(C - C\) and \(C - O\), \(C - C\) has a less polar bond than \(C - O\…
-
marco and his classmates are anxious about the upcoming chemistry test.…
- B. Politely refuse to cheat and start studying more. - C. Start a study group to prepare for the exam and build confidence. - E. Identify the act of cheating as wrong and too ri…
-
current attempt in progress the complete combustion of ethanol, ( c_{2}…
78.8%
-
current attempt in progress the limiting reactant can be described as: …
the substance that is depleted first and stops a reaction.
-
current attempt in progress what information beyond the mole ratio is n…
Molar mass of product
-
current attempt in progress what piece of information is needed to conv…
molar mass
-
what is a mole ratio? a mole ratio is the ratio between the amounts of …
A mole ratio is the ratio between the molar amounts of any two atoms and/or molecules involved in a chemical reaction.
-
elemental silicon can be produced by the reduction of silicon dioxide, …
\(88.0\%\)