化学
化学反応、化学量論、分子構造、元素の性質。
-
the modern periodic table is arranged in order of increasing atomic o c…
number
-
each period in the periodic table corresponds to a(n) ____. suborbital …
principal energy level
-
elements that are characterized by the filling of p orbitals are classi…
groups 3A through 8A
-
question 4 the bullets for a rifle or handgun are commonly made out of:…
C. lead
-
match each item with the correct statement below. horizontal row in the…
- horizontal row in the periodic table: period - vertical column in the periodic table: group - A repetition of properties occurs when elements are arranged in order of increasing…
-
atomic size generally decreases as you move from top to bottom within a…
decreases as you move from left to right across a period.
-
orbitals of the same energy as referred to as orbitals.
Degenerate
-
what is another name for the representative elements? group b elements …
Group A elements
-
what is the energy required to remove an electron from an atom in the g…
C. Ionization energy
-
in which of the following groups of ions are the charges all shown corr…
\(Ca^{2 +},Al^{3+},Br^{-}\)
-
which of the following elements has the lowest electronegativity? ○ bro…
lithium
-
what causes the shielding effect to remain constant across a period? el…
Electrons are added to the same principal energy level.
-
in which of the following sets is the symbol of the element, the number…
In, 49 protons, 49 electrons.
-
who arranged the elements according to atomic mass and used the arrange…
Dmitri Mendeleev
-
which of the following decreases with increasing atomic number in group…
ionization energy
-
of the following elements, which one has the smallest first ionization …
aluminum
-
question 9 (mandatory) (1 point) using electronegativity, determine whi…
B. \( C - O \)
-
question 7 (mandatory) (1 point) what is the balanced chemical equation…
C. \(Mg_{(s)}+2HCl_{(aq)} ightarrow MgCl_2{(aq)}+H_2{(g)}\)
-
classify the following diagram as diatomic molecules, polyatomic molecu…
molecules that are compounds
-
write the formula for the following ionic compound: magnesium phosphate…
\(Mg_3(PO_4)_2\)
-
write the molecular formula of methanol. the color codes for the ball -…
$CH_{4}O$
-
a. link each particle or substance with the correct diagram and descrip…
1. h 2. c 3. f 4. b 5. i 6. a 7. g 8. d
-
part c ( 25 marks) - show all the steps and working in the answers for …
Empirical formula: \(Na_{2}SO_{4}\), Molecular formula: \(Na_{4}S_{2}O_{8}\)
-
test your knowledge!! think youve gathered the necessary clues to solve…
B. change
-
a hydrogen - like ion is an ion containing only one electron. the energ…
\(5250\ kJ/mol\) (rounded to three significant digits)
-
an atom has a mass number of 66. if the number of neutrons in the nucle…
\(Zn\)
-
select the correct statement(s) about atomic and ionic sizes below. au3…
\(\text{Na}^{+}\text{ is smaller than Na}\), \(\text{Au}^{3 +}\text{ is smaller than Au}^{+}\)
-
write the name of each of the following binary compounds of nonmetallic…
Krypton difluoride
-
using the periodic table, please provide the name of an element that me…
1. Selenium (or other non - metals in the fourth period like Bromine) 2. Chlorine
-
c) you read online that 1ml of water weighs 1 gram. you drink 2.5 litre…
Approximately \(138.89\) moles.
-
list the following ions in order of increasing ionic radius: na+, n3−, …
\(Mg^{2+}<Na^{+}<F^{-}<O^{2 -}<N^{3 -}\)
-
a hydrogen - like ion is an ion containing only one electron. the energ…
\(2.10\times 10^{4}\text{ kJ/mol}\)
-
3. what is the purpose of a survey in sociology? a to observe people in…
C. To gather data on attitudes, beliefs, or behaviors
-
complete the rhyme scheme. a b b b c d the sun was shining on the sea, …
A, B, B, B, C, D
-
calculate the total number of electrons that can occupy the following o…
One \(s\) orbital: \(2\) Seven \(f\) orbitals: \(14\)
-
determine the maximum number of electrons that can be found in each of …
Part 1 of 4: \(2\) Part 2 of 4: \(10\) Part 3 of 4: \(6\) Part 4 of 4: \(14\)
-
instructions: in each question, list the elements from least to greates…
\(Be\), \(Mg\), \(Ba\)
-
almost all of an atoms mass is found in its nucleus, located in the cen…
- The nucleus of an atom is found in the atom's center: True - The nucleus of an atom contains at least one proton: True - Most of an atom's mass is found in protons and neutrons:…
-
though they are too small to see without a special microscope, atoms ma…
Atoms make up every substance around you.
-
question 6 (1 point) use the following information to answer the next q…
A. non - 5 - yne
-
shivani and her team take a pizza break inside their ship to celebrate …
Evidence that the pizza underwent a physical change is *chewing the pizza into smaller chunks*. This is a physical change because *no new substances are formed; only the size and …
-
you know the \q\ because it was calculated to be 1,030.38 j. you know t…
\(0.735\space J/(g\cdot^{\circ}C)\)
-
use this data to find q for the experiment. specific heat 4.184 j/gc in…
$18018.92J$
-
6 shivani finds a soft off-white object about the size and shape of a m…
Shivani might see a color change (e.g., browning or blackening), release of gas/smoke, and a change in texture (e.g., brittleness or a new firmness).
-
a reaction takes place in water. the waters initial temperature is 21.9…
$13904J$
-
shivani finds a soft white objects about the size and shape of a marshm…
The mystery object might melt, change shape, or change texture. For example, it could go from a solid marshmallow - like shape to a melted, more fluid form, or it could soften and…
-
18. the smallest particle of an element that retains the properties of …
d. atom # 19.
-
unit 2 test - atomic structure and radioactivity (fall 2026) multiple c…
a. It is the fuel source of stars. 2.
-
name: 9. the half - life of an isotope is the time required for half th…
a. undergo radioactive decay ### 10.
-
matching match each item with the correct statement below. (answers can…
26. b. electron 27. c. neutron 28. a. proton 29. c. neutron 30. a. proton
-
a metal block with a mass of 55.0 g. was heated from 16.4 c to 46.4 c. …
The energy absorbed by the metal block is \(1613.7\space J\). The \(\Delta T\) for water is \(47.56^{\circ}C\)
-
compare nacl from wax/candle which of the following best describes the …
B. NaCl forms through electron transfer and tends to be a solid with high melting and boiling points, while wax forms through electron sharing and is typically a solid at room tem…
-
why does nitrogen form a triple bond in n₂? a. to share three pairs of …
A. To share three pairs of electrons for a full octet
-
question 17 in the hcl molecule, how many electrons are shared between …
B. 2 electrons
-
evaluate understanding what did i learn? bond length and energy compari…
A. \(C - C\) single bond \(<C = C\) double bond \(<C\equiv C\) triple bond
-
evaluate understanding what did i learn? bond length and energy compari…
A. C - H single bond
-
which of the following carbon - carbon bonds has the shortest bond leng…
C. \(C\equiv C\) triple bond
-
evaluate understanding what did i learn? bond length and energy compari…
B. Decreases
-
question 8 1 pts which of the following statements is true about single…
B. Double bonds have higher bond energy but shorter bond length than single bonds.
-
why are molecules like h₂, o₂, and n₂ considered diatomic? a) they are …
A. They are composed of two atoms of the same or different elements.
-
which of the following is a diatomic molecule? a) h₂o b) co₂ c) o₂ d) n…
C. \(O_2\)
-
which type of bond is present in most diatomic molecules, such as h₂ an…
C. Covalent bond
-
review. chemical bonds chemical bonds can be generally described as an …
The three types of chemical bonds are ionic bonds, covalent bonds, and metallic bonds.
-
bellwork: what is the main difference between nacl (sodium chloride) an…
The main difference is that \(NaCl\) is an ionic compound (formed by \(Na^{+}\) and \(Cl^{-}\) ions with ionic bonds) while \(H_{2}O\) is a covalent compound (with \(H - O\) coval…
-
prepwork part 1: atomic radius oer practice one of the ap chemistry stu…
a. Magnesium and barium are found in the same **group**, which means they have the same **number of valence electrons** but different **number of electron shells**. The relationsh…
-
name: teacher: uncommon q2 chemistry: u3l3 atomic radius date: schools …
1. B. Energy needed to remove an electron 2. B. Higher Zeff 3. C. Increased shielding and distance 4. B. Cs 5. True 6. False 7. False 8. True 9. True
-
the arcade looked nothing like how cory had imagined. it did not match …
D. schema
-
put the words in the right order to cribe the noun. the chemistry exper…
the successful chemistry experiment
-
when marias friend mentioned an upcoming concert, maria quickly thought…
A. semantic network
-
a true b false check it the repulsion between different types of electr…
b. FALSE
-
according to the vsepr theory, the shape of a covalent molecule depends…
D. All of the above
-
which atom in a molecule is the focus of vsepr theory? a the atom with …
B. the central atom
-
how will electron pairs behave towards one another according to vsepr? …
C. They will arrange themselves to be far apart from each other.
-
questions 10 through 13 refer to the following. (the passage below is a…
A. Keep it, because it adds information that helps clarify the contrasting relationship identified in sentence 6 between anticipation and reward.
-
questions 10 through 13 refer to the following. (the passage below is a…
A. Keep it, because it provides examples that help explain the scientific terminology used in the following sentence.
-
questions 10 through 13 refer to the following. (the passage below is a…
C. brain, with potentially serious physiological and emotional costs
-
what geological features are found in the hadalpelagic zone? (1 point) …
troughs and trenches
-
which statement describes the relationship between temperature and the …
Increasing the temperature causes the molecules to move faster.
-
which property describes waters attraction to other molecules? (1 point…
B. adhesive forces
-
what is the name of the attraction that forms hydrogen bonds between ne…
cohesion
-
#9 which element is in group 13/3a period 4 on the periodic table? gall…
gallium
-
students choose an option periodic table groups and families #9 which e…
Gallium
-
students choose an option do not remove this bar periodic table groups …
halogens
-
students choose an option #7 periods tell what about an element? period…
the number of energy levels around an atom
-
students choose an option periodic table groups and families #6 categor…
metalloids
-
students choose an option #5 the elements chlorine, fluorine and bromin…
halogens
-
students choose an option do not remove this bar peer deck interactive …
1
-
students choose an option #3 which of the following is not a characteri…
commonly gases at room temperature
-
students choose an option do not remove this bar peer deck interactive …
metals
-
students choose an option periodic table groups and families #1 select …
the noble gases, not reactive
-
a chemist is using 374 milliliters of a solution of acid and water. if …
\(57.2\)
-
figure 14.10. emperor justinian and his attendants. sort the descriptio…
Unity: The emperor's halo, There are many vertical lines, Gold appears throughout the image. Variety: The cut pieces that form the surface are composed of glass, stone, ceramics, …
-
a reaction where two or more substances combine to form one compound * …
- First question: Synthesis reaction - Second question: Balance equations by ensuring equal numbers of each atom type
-
two liquids mix and a solid forms that sinks to the bottom. * what conc…
A precipitate was formed
-
a reaction in which a single compound breaks into simpler substances is…
- First question: Decomposition - Second question: \(O_{2}\) and \(H_{2}\)
-
which statement correctly compares endothermic and exothermic reactions…
Endothermic absorbs heat; exothermic releases heat
-
a reaction absorbs energy and causes the beaker to feel cold. * which s…
The reaction absorbed energy and was endothermic.
-
in a single replacement reaction, what happens? * one element replaces …
1. One element replaces another in a compound 2. Law of Conservation of Matter 3. Activation energy
-
the substances produced by a chemical reaction are called: * 5 points r…
- First question: Products - Second question: Spectator ions are present on both the reactant and product sides of a chemical equation.
-
students observed that mixing two clear solutions formed a white solid …
Exothermic & Precipitation