化学
化学反応、化学量論、分子構造、元素の性質。
-
10. when a liquid becomes a gas below its boiling point, this is called…
10. D. Evaporation 11. a. HM 12. b. C 13. c. HT 14. d. C 15. e. E
-
alkalinity, a measure of how basic a substance is, is not measured on a…
TRUE
-
assume that you test an unknown solution and find that it has a ph of 7…
Base
-
what is the ph of a neutral solution? enter the answer
7
-
gizmo warm - up just like passengers getting on a bus, electrons orbit …
1. 3 2. 3 3. A. 2 electrons in the 1s box B. Partially correct
-
where will electrons most likely be found in an atom? a inside the nucl…
C. surrounding the nucleus
-
acids have ph ______ than 7, bases have ph ______ than 7. higher, lower…
lower, higher
-
which of the following is/are acids? select all that apply a milk b cof…
A. milk B. coffee D. orange juice
-
student exploration: electron configuration vocabulary: atomic number, …
1. Answers may vary, but could be a single - seat or a back/corner seat. 2. Answers may vary, but could be a window - seat or a seat with more space. 3. No
-
complete the sentence using one of the following words: solution, subst…
solution
-
ocean water has a ph of approximately 8.5. that means ocean water is __…
B. basic
-
which of the following statements correctly describes energy levels? se…
B. Energy levels are located at fixed distances from the nucleus. C. Energy levels farther from the nucleus have more energy.
-
what is the ph of a neutral solution? a 2 b 5 c 7 d 9
C. 7
-
acid deposition causes the ph scale a substance with a high ph of 12 (e…
alkaline or basic
-
for sound to travel, there must be molecules to vibrate. the closer the…
A. Sound travels faster in steel than in water.
-
which chemical formula reflects the diagram? o 6o12h6c o 6c12h6o o o₆h₁…
D. $C_{6}H_{12}O_{6}$
-
properties of the elements *numbers are for educational purposes only a…
1. 181.7°C 2. Oxygen 3. Helium, Lithium 4. Oxygen 5. 3485°C 6. Lithium 7. As atomic number increases, atomic mass generally increases but not in a strictly linear fashion.
-
6 which is the largest atom? 7 what is the relationship between atomic …
6. Without specific atoms listed, cannot give a definite largest atom. But in general, atoms in lower periods and left - hand side of the periodic table are larger. 7. Atomic mass…
-
false: \all mixtures are physically separable.\ defend your answer with…
The statement "All mixtures are physically separable" is false. An example is steel, an alloy which is a mixture of iron and carbon, and it is difficult to separate carbon from ir…
-
5. it is made with only one type of atom. a. element b. compound c. hom…
5. A. Element 6. B. Liquid 7. C. Vibrate in fixed positions 8. B. Water boiling 9. C. Plasma
-
lesson 2, continued to fix this problem, officials devised a plan to di…
1. Officials devised a plan to divide the earth's surface into 24 time - zones, one for each hour of the day. The US would have four time - zones (Eastern, Central, Mountain, and …
-
3. which of the following can be broken down by physical means. a. elem…
3. B. Mixture 4. B. Compound
-
instructions: choose the best answer for each question. show work w nec…
1. B. Salt water 2. A. Silver
-
2. what is the difference between a homogeneous and a heterogeneous mix…
2. A homogeneous mixture has a uniform composition throughout, while a heterogeneous mixture has a non - uniform composition with visible different parts. 3. | Mixture Type | Part…
-
which depiction of changing chemical compounds best describes the flow …
$N_2 ightarrow NH_4^+ ightarrow NO_3^- ightarrow N_2$ (the third option)
-
2s = o 1044 2co + o₂ → 2co₂ 2c≡o 2148 o = o 499 4c = o 2956 which react…
$N_2 + O_2 ightarrow 2NO$
-
1. a) write the full and condensed electron configuration for one of th…
For part (a) (using Sc as an example): Full electron configuration: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}$, Condensed electron configuration: $[Ar]$. For part (b) (using Sc as an exampl…
-
cl-cl 242 h-h 435 hydrogen and chlorine gases react to produce hydrochl…
854
-
hydrogen and iodine gases react to produce hydroiodic acid according to…
594 kJ/mol (corresponding to option with value 594)
-
which fact must be true if a relationship is endothermic? (1 point) mor…
More bond energy is absorbed on the reactant side than released on the product side.
-
which statement explains the relationship between the amount of energy …
The amounts of energy are always equal.
-
1. what is a mixture?
A combination of two or more substances that are not chemically combined, with substances retaining individual properties and separable by physical means.
-
calculate the relative atomic mass of these isotopes * oxygen-16 percen…
$15.8578$
-
the triad of lithium, sodium, and potassium reacted vigorously with wha…
C. oxygen, sulfur, and selenium
-
carbon has three isotopes. carbon-12 carbon-13 carbon-14 which isotope …
1. D. They are the same 2. 35.5
-
describe one way bohrs atomic model was similar to rutherfords and one …
The two models are similar because both have a nucleus with electrons surrounding it. The two models are different because Bohr's model has electrons in fixed - energy orbits whil…
-
carbon has three isotopes: carbon-12 carbon-13 carbon-14 which isotope …
C. Carbon - 14
-
how many neutrons are in the following isotope: * carbon - 14 your answ…
8
-
what is the mass number of nitrogen if it has 8 neutrons * your answer …
15
-
how many neutrons are in the following isotope: * carbon - 14 your answ…
8 15 Carbon - 14
-
electron configurations worksheet write the complete ground - state ele…
Complete electron configurations: 1. Lithium: $1s^{2}2s^{1}$ 2. Oxygen: $1s^{2}2s^{2}2p^{4}$ 3. Calcium: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}$ 4. Nitrogen: $1s^{2}2s^{2}2p^{3}$ 5…
-
what is an isotope? * versions of the same atom where the number of neu…
1. Second option: Versions of the same atom where the number of Protons and electrons are the same, but the number of neutrons is different 2. First option: Protons
-
match the vocabulary word to its definition. smallest unit of a chemica…
smallest unit of a chemical element - d. atom a subatomic particle with a negative charge - c. electron a subatomic particle with no charge - a. neutron center of an atom - b. nuc…
-
how many neutrons does this have? * 19 9 f 9 19 10 -1 28
C. 10
-
how many electrons does this have (assuming neutral)? 19 9f how many ne…
A. 9
-
how many protons does this have? * 19 9 f 9 19 10 -1 28
A. 9
-
if the element is neutral, how many electrons are there in oxygen? * yo…
The number of electrons in neutral oxygen is 8. The number of neutrons in aluminum - 27 is 14.
-
what is the symbol of element 2?* 1 point
Co
-
use this image to answer the following questions periodic table of the …
15
-
which best describes how energy changes form in a cars engine? a single…
D. Multiple transformations occur because the chemical energy of the fuel is changed to several forms of energy.
-
john daltons atomic theory stated that: - all elements are composed of …
Atoms are not indivisible as they contain sub - atomic particles; atoms of the same element can have different isotopes and thus not be identical.
-
who was the first person to come up with atoms? (he called them “atomos…
1. C. Democritus 2. A. A solid sphere that couldn't be broken down
-
hydrogen bromide breaks down into diatomic hydrogen and bromine in the …
C. - 102 kJ/mol, exothermic
-
when producing hydrogen iodide, the energy of the reactants is 581 kj/m…
C. 9 kJ/mol, endothermic
-
how is total reaction energy calculated? (1 point) product bond energy …
C. reactant bond energy - product bond energy
-
which event is an example of an endothermic reaction? (1 point) rusting…
photosynthesis
-
which result occurs during an exothermic reaction? (1 point) light and …
Light or heat are released into the environment.
-
which best describes the rhyme schemes in \a psalm of life\ and \auspex…
Neither poem follows a strict rhyme scheme.
-
which statement best describes the rhyme scheme in a psalm of life? the…
The poem adheres to a strict ABAB rhyme scheme, with the exception of the first stanza.
-
engage the diagram above shows a mosaic of 40 galaxies. these images we…
| Galaxy Type (name and draw) | Defining Characteristics (write a short description, provide enough detail so that anyone could use your scheme) | Three Examples (give 3 grid coor…
-
models 1, 2, and 3 are lewis dot structures for polar covalent, nonpola…
D. Model 3 only
-
data collected during a particular lab: density of an aluminum cube (g/…
Student A
-
panyin wants to use this research for her informative essay. because or…
Research shows that organic foods pose less danger to human health than nonorganic foods.
-
17 of 20 which specific rule applies to the naming of all the compounds…
D. The cation is named first, including a Roman numeral for the charge of a transition metal, followed by the anion which ends in -ide if the compound is binary or ends with the n…
-
given a formula of oxygen what is the total number of electrons shared …
A. 4
-
15 of 20 multiple choice finish quiz polyatomic ions name\tformula nitr…
A. $H_2SO_3$, sulfurous acid (Rule 3) B. $H_3PO_4$, phosphoric acid (Rule 2) C. $HNO_3$, nitric acid (Rule 2) D. $HF$, hydrofluoric acid (Rule 1) E. $HCl$, hydrochloric acid (Rule…
-
13 of 20 the table shows the normal boiling point of four compounds. wh…
D. HF (l)
-
the table below describes four atoms. atom a: number of protons 79, num…
Atom A and Atom D; Atom B and Atom C
-
ho o oh hemiacetal acetal neither
hemiacetal
-
which elements of strict formal structure do \auspex\ and \a psalm of l…
First question: They both have a rhyme scheme. Second question: "Auspex" has six - line stanzas while "A Psalm of Life" has four - line stanzas.
-
which elements of strict formal structure do \auspex\ and \a psalm of l…
They both have a rhyme scheme.
-
23. 40 g of calcium reacts with 71 g of chlorine to produce ____ g of c…
23. 111 24. 78 25. 32 26. 62 27. 15.5 28. 248 29. 71 30. 58 31. 254 32. 2
-
ch3 ho — ch2 ch — o — c — o — ch2 — ch3 ch3 ch2 — o — ch3 o hemiacetal …
First structure: neither Second structure: hemiacetal
-
determine whether each of the following molecules is a hemiacetal, ch3o…
hemiacetal
-
19. find the reactants mass in grams using the following reaction. iron…
220 ### 20.
-
choose the correct rhyme scheme for each of the following lines. had th…
a, b, c, a, b, c
-
write the systematic name of each organic molecule: structure
2 - hydroxybutanal
-
what is mass spectrometry primarily used for? measuring the speed of li…
C. Measuring the mass - to - charge ratio of molecules
-
what does the highest peak on a mass spectrum represent? the most abund…
The most abundant ion
-
what is the result shown as in mass spectrometry? a line graph a mass s…
B. A Mass Spectrum
-
what is the first step in mass spectrometry as described in the summary…
Transferring the sample to the gas phase and ionizing it
-
what is the purpose of the applied electric field in mass spectrometry?…
To accelerate the ions
-
on a mass spectrum, what is displayed on the x - axis? mass to charge r…
Mass to charge ratio
-
what are the first two steps in mass spectrometry often separated by? e…
D. Liquid Chromatography
-
what is the process called where molecules are transferred into the gas…
B. Ionization
-
chantel and a few of her friends have an important chemistry test comin…
She could ask a librarian or security guard to accompany her to her car.
-
what are the molecular and empirical chemical formulas of a compound ma…
Molecular formula: $C_{3}H_{8}O_{3}$ Empirical formula: $C_{3}H_{8}O_{3}$
-
question 18 of 18 < points possible: 1.00 calculate the rf value for a …
$0.59$
-
question 13 (2 points) what is present in human blood that ensures bloo…
A. A buffer [bicarbonate ions ($HCO_3^-$) and carbonic acid ($H_2CO_3$)]
-
where art thou, muse, that thou forgetst so long to speak of that which…
A. The rhyme scheme is abab cdcd efef gg. E. The regular rhyme scheme makes the sonnet sound musical and memorable.
-
suppose you are performing an acid/base extraction. after one of the st…
The product of the addition of \(HCl\) to the phenolate - containing layer is the neutral phenol compound (the third - option structure with an \(OH\) group on the aromatic ring).…
-
determine which base will work to deprotonate each compound in an acid/…
Hydroxide or bicarbonate ## Step3: Analyze the second compound (phenol - like) Phenols ($pK_a \approx 10$) can be deprotonated by hydroxide but not by bicarbonate because bicarbon…
-
determine which base will work to deprotonate each compound in an acid/…
1. Sodium bicarbonate ($\mathrm{NaHCO_3}$) 2. Sodium hydroxide ($\mathrm{NaOH}$) 3. Sodium hydride ($\mathrm{NaH}$)
-
determine which base will work to deprotonate each compound in an acid/…
For the first compound (carboxylic - acid containing): Sodium bicarbonate ($\mathrm{NaHCO_3}$) For the second compound (phenol - containing): Sodium hydroxide ($\mathrm{NaOH}$) Fo…
-
multiple - choice question which is an example of an unsaturated fatty …
olive oil
-
e active element takes the place of sis reaction. position reactions ar…
a) Hydrotelluric acid b) Phosphoric acid c) $HNO_3$ d) $H_3P$
-
nonpolar means electrons are shared equally within the molecule electro…
electrons are shared equally within the molecule
-
which of these is a heterogeneous mixture? oil and water salt gold
oil and water
-
what type of mixture is trail mix? heterogeneous solution homogeneous
heterogeneous
-
lipids are composed mainly of... (select all that apply) hydrogen carbo…
Hydrogen, Carbon, Oxygen