Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
-
question 2 (1 point) after heating until a constant mass was establishe…
A) 1.6464 g
-
phase changes graph: temperature (k) vs. time, segments labeled 1–5 whi…
220 K ### Freezing point (assuming the question is about freezing point)
-
question 1 (1 point) in the lab, you find the evaporating dish and watc…
B) 2.0830 g
-
electrons on the shells closest to the nucleus have the lowest energy, …
highest energy
-
where art thou, muse, that thou forget’st so long to speak of that whic…
- The rhyme scheme is abab cdcd efef gg. - The regular rhyme scheme makes the sonnet sound musical and memorable.
-
(1 point) electrons on the shells closest to the nucleus have the lowes…
For the dropdown related to electrons farthest from the nucleus, the answer is "highest energy".
-
select the correct answer. why is john dalton known as the originator o…
D. He could scientifically explain the theory of atoms.
-
select the correct answer(s) from the list(s). (1 point) electronegativ…
First dropdown: decrease Second dropdown: increase
-
select the correct answer. which statement is true about a catalyst? a.…
C. A catalyst lowers the activation energy of a reaction.
-
select the correct answer from each drop-down menu. in a reversible rea…
a constant rate of forward reaction and reverse reaction
-
match each element with its correct number of valence electrons: (3 poi…
- Magnesium: 2 valence electrons - Sodium: 1 valence electron - Oxygen: 6 valence electrons - Aluminum: 3 valence electrons - Carbon: 4 valence electrons - Nitrogen: 5 valence ele…
-
select the correct answer. what does an atom gain or lose in an oxidati…
D. electrons
-
(3 points) the third energy level can hold up to the first energy level…
- The third energy level can hold up to: 18 electrons - The first energy level can hold up to: 2 electrons - The second energy level can hold up to: 8 electrons
-
select the correct answer. what is the purpose of the arrow in a chemic…
A. It indicates the direction in which the reaction occurs.
-
select the correct answer. in the covalently bonded chemical compound a…
C. +3 and -3
-
drag and drop the correct element name to the appropriate bohr model (3…
To solve this, we analyze the Bohr models by counting protons (atomic number) and electrons: ### First Bohr Model (left): - **Electrons**: Inner shell (n=1) has 2, outer shell (n=…
-
according to the kinetic molecular theory, what determines the state of…
A. The particle speed and spacing
-
select the correct answer from each drop-down menu the reaction between…
The rate of the reverse reaction increases and produces more hydrogen chloride.
-
select the correct answer from each drop-down menu. the reaction betwee…
The rate of the \(\boldsymbol{\text{forward reaction increases}}\) and produces more (products of the forward reaction like \(\text{ZnCl}_2\), \(\text{H}_2\), or heat). For the fi…
-
1. a resident of a skilled nursing facility is receiving chemotherapy t…
B. Palliative care ### Question 2
-
drag each tile to the correct box. match each part of the electrochemic…
- electron transport → wire - oxidation → anode - ion transport → salt bridge - reduction → cathode
-
select the correct answer. which compound in this chemical equation ind…
D. \( \text{Mg(OH)}_2 \)
-
an element: a contains only one type of atom b is always a solid c can …
A. Contains only one type of atom
-
select the correct answer. a student carries out this chemical reaction…
C. Cu and \( \text{ZnCl}_2 \)
-
which state of matter has no definite shape but a definite volume? a li…
A. Liquid
-
select all the correct answers. based on the reactivities of the elemen…
The correct reactions are: - \( 2\text{LiI} + \text{Cl}_2 ightarrow 2\text{LiCl} + \text{I}_2 \) - \( 2\text{LiBr} + \text{F}_2 ightarrow 2\text{LiF} + \text{Br}_2 \) (In boxed fo…
-
atomic structure unit test. left boxes: (empty), group, valence electro…
To solve this matching problem, we analyze each term and its correct definition: ### 1. Group Definition: A collection of elements forming a single column on the periodic table (m…
-
select the correct answer from each drop-down menu. a beaker containing…
First drop - down: decrease Second drop - down: decrease
-
when you boil a substance, the particles move select one and get select…
When you boil a substance, the particles move $\boldsymbol{\text{faster}}$ and get $\boldsymbol{\text{larger}}$ (in distance between them). When you freeze a substance, the partic…
-
which of the following is heterogeneous? a air b water c oil and water …
C. Oil and water
-
ase diagrams p (atm) 1.5 1.0 w x 0.5 z y 0 -10 0 10 20 30 40 50 60 70 t…
C. 15 C ### Part E
-
match each scientific term with its correct definition: (5 points) theo…
To solve this matching problem, we analyze each scientific term and its correct definition: ### 1. Theory A theory in science is a well - substantiated explanation of some aspect …
-
which substance is a compound? ○ water ○ gold ○ oxygen ○ hydrogen
A. water
-
which statement correctly describes a chemical reaction? ○ reactants co…
C. Bonds between atoms break and reform.
-
select the correct answer. a displacement reaction takes place when cal…
A. Zn and $\ce{CaCl_{2}}$
-
consider the simplest amino acid, glycine, whose structure is shown bel…
(σ bonds): 9
-
a researcher is designing a laboratory experiment to determine whether …
B. 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 t…
-
which is the best definition of activation energy? the energy required …
the energy required to form or break the bonds of reactant molecules
-
select the correct answer. how does the equilibrium change with the rem…
A. Equilibrium shifts right to produce more product.
-
which will increase the rate of a chemical reaction? ○ adding a catalys…
A. adding a catalyst
-
select the correct answer. what can be inferred from the graph? a + b \…
E. The reaction between A and B is product favored.
-
a scientist is conducting an investigation that involves water, silver,…
They are each made of matter. Some are compounds and some are elements. They all contain atoms.
-
match each chemical reaction with the type of reaction that best descri…
To solve this, we analyze each reaction type: ### 1. Synthesis Reaction A synthesis reaction combines two or more substances into one. - Reaction: $\boldsymbol{\ce{Ca + Br2 -> CaB…
-
which statement best describes the relationship between activation ener…
B. Reducing the activation energy can increase the rate of a reaction.
-
drag each number to the correct location on the equation. each number c…
\( \text{SiO}_2 + \boldsymbol{4}\text{HF} ightarrow \text{SiF}_4 + \boldsymbol{2}\text{H}_2\text{O} \) (Coefficients: 1 (for \( \text{SiO}_2 \)), 4 (for \( \text{HF} \)), 1 (for \…
-
select the correct answer. in which state does the precipitate exist in…
C. solid
-
select the correct answer. which compound will precipitate when solutio…
D. none
-
which chemical equations show an oxidation-reduction reaction? □ o₂ + 2…
- $O_{2}+2H_{2} ightarrow 2H_{2}O$ - $2Al + 6HI ightarrow 2AlI_{3}+3H_{2}$
-
select the correct answer. what type of reaction does this chemical equ…
C. exothermic
-
7. equivalency: ______ mg = ______ g 0.6 mg x ______ = ______ g 8. equi…
Equivalency: 1 Mg = \(10^6\) g 0.6 Mg × \(\frac{10^6 \text{ g}}{1 \text{ Mg}}\) = 600000 g ### Problem 8
-
select the correct answer. what effect does an increase in products hav…
D. The reverse reaction rate increases.
-
select the correct answer from each drop - down menu. what causes atoms…
First drop - down: each atom and the shared electrons Second drop - down: the valence electrons of the two atoms
-
select the correct answer. how does substituting a hydrogen atom with a…
B. The boiling point of the new compound increases.
-
select the correct answer. what is the chemical formula of trisilicon t…
A. $\ce{Si_3N_4}$
-
select all the correct answers. which two properties are characteristic…
A. brittleness, C. high melting point
-
select the correct answer. which property is typical of a covalent comp…
B. They have low melting and boiling points.
-
when methane is burned with oxygen, the products are carbon dioxide and…
b. 22
-
recognizing sonnet form match each rhyme scheme to the correct portion …
- \(gg\) → couplet - \(cdcd\) → second quatrain - \(efef\) → third quatrain - \(abab\) → first quatrain
-
select all the correct answers. the electron configurations of some ele…
B. Iron [Ar] \(3d^{6}4s^{2}\) D. cobalt [Ar] \(3d^{7}4s^{2}\)
-
select the correct answer. which atom or ion is the largest? a. k b. k⁺…
A. K
-
how many total atoms are in the formula al₂(co₃)₃? a. 8 b. 9 c. 12 d. 1…
d. 14
-
unit conversion activity → use the conversion factors /equivalency show…
Equivalency: \(1\) \(kg = 1000\) \(g\) \(0.0832\space kg\times\frac{1000\space g}{1\space kg}= 83.2\space g\) ### Problem 3
-
multiple select question select all that apply which of the following a…
B. Simply organization allows for improved memories. C. Memories are organized with schemas and connectionists networks. D. Memories are not haphazardly stored but instead are car…
-
drag the tiles to the correct locations. each tile can be used more tha…
The Lewis structure is constructed by placing: - N in the middle circle. - H in the left and right circles. - Cl in the top circle. - Single bonds (—) between N - H (left), N - H …
-
select the correct answer from each drop-down menu. the compound ammoni…
First dropdown: polyatomic Second dropdown: 2 Third dropdown: 1
-
select the correct answer from each drop-down menu. a carbon atom forms…
First drop - down: four Second drop - down: sharing
-
5 multiple choice 20 points suppose that you test apple juice and find …
3.5 acidic
-
10 type the correct answer in each box. complete the chemical formula f…
magnesium nitride: Mg \(\boldsymbol{3}\) N \(\boldsymbol{2}\) calcium chloride: CaCl \(\boldsymbol{2}\)
-
which of the following correctly shows the structure of the molecule af…
To solve this, we analyze the reaction of the given molecule (a carboxylate anion, likely from a carboxylic acid derivative or a deprotonated carboxylic acid) with HCl. ### Step 1…
-
select the correct location on the image. the orbital diagram shows the…
The last electron will occupy one of the singly - occupied 3p orbitals (the 3p orbitals with one electron, to pair with the existing electron in that orbital). In the diagram, it …
-
course activity: observing a chemical reaction container. - the chemica…
I would choose to change the amount of baking soda. Reason: Baking soda is a solid, so it can be measured in small, precise increments (e.g., 1/4 tsp, 1/2 tsp) to study how the qu…
-
multiple choice question according to connectionism, memories are best …
D. electrical impulses
-
part c why do you use the same amount of baking soda and same amount of…
To control variables in the experiment, ensuring that only the intended factor (e.g., type of liquid) affects the outcome, so results are valid and comparable.
-
eliot is given a sample of unknown liquid to test in the laboratory. el…
a. boiling point of the liquid
-
which of the following examples depict(s) a physical property? a \tsuga…
d. All of the above
-
how are physical properties typically detected?. a lab glassware b equi…
d. the senses
-
question # | total # of atoms 1. h₂so₄ h = s = o = | six yellow | seven…
s: 1. $H_2SO_4$: seven [red] 2. $CH_3OH$: six [orange] 3. $NaH_2PO_4$: eight [yellow] 4. $NH_4Cl$: six [green] 5. $Al(OH)_3$: seven [sky blue] 6. $Fe_2(SO_4)_3$: seventeen [yellow…
-
name nikkaya scott date sep 10, 2023 block: blue 4 scientific method an…
B ### Question 2
-
which is the first step in the dissolving process? the solute becomes l…
The solvent molecules are attracted to particles at the surface of the solute.
-
in what way are the lines of \the weary blues\ similar to the lyrics of…
A. The poem uses repetition to create meaning.
-
nonmetals & metalloids; hydrogen, oxygen and chlorine; silicon, arsenic…
Hydrogen, Oxygen and Chlorine; Usually have no luster; Comprised of atoms (select based on exact question, e.g., if single label: Hydrogen, Oxygen and Chlorine)
-
consider the half reactions below for a chemical reaction. mg ⟶ mg²⁺(aq…
\(\text{Mg}(s) + 2\text{H}^+(aq) ightarrow\text{Mg}^{2+}(aq)+\text{H}_2(g)\) (corresponding to the first option among the given choices)
-
question 2: analyze and extend part a explain whether a chemical reacti…
To answer this, we analyze chemical reaction indicators: ### General Approach for Each Combination: 1. **Identify Evidence of Reaction**: Look for signs like gas production (bubbl…
-
what is the formula mass of sulfurous acid? a. 82.08 amu b. 98.08 amu c…
a. 82.08 amu
-
what is the molecular equation for the reaction of hydrochloric acid wi…
d. $\ce{HCl + KOH ightarrow H_{2}O + KCl}$
-
10. weve looked at two different isotopes of carbon, carbon-12 and carb…
No, the mass number is not found on the periodic table.
-
yes! mass number (14) - protons (6) = neutrons (8) 9. lets try another …
The number of neutrons in a carbon - 12 isotope is 6.
-
determine the iupac name of the below organic compound: image of the or…
b. 4 - methylheptane
-
isotopes of carbon this image depicts three isotopes of carbon. note th…
B. $6\ p^+, 7\ n^0, 6\ e^-$ ### PART B
-
the term 3 fecl₂ in a balanced equation says a that there are three iro…
C. that there are three formula units, each consisting of two chloride ions bonded to an iron(II) ion.
-
identify the oxidation-reduction reactions among the following: 1. zn(s…
d. All of 1, 2, and 3
-
a + b → c + d if there are 4 grams of product produced by the chemical …
D. 4 grams
-
what are the coefficients for the following chemical reaction when it i…
a. 2, 1, 1, 1
-
8. the mass number can also be written in the name of an isotope. for e…
The number of neutrons in carbon - 14 is 8.
-
within the alarm clock seen here, energy is transformed. it is time to …
B. electrical to mechanical to sound
-
an icepack contains ammonium nitrate. when this is dissolved in water i…
C. chemical
-
7. determine an equation for mass number. mass number = protons + ? neu…
Neutrons (the option "Neutrons" is the correct one to fill in the blank, so the answer is the "Neutrons" option, which would be represented as the button or choice labeled "Neutro…
-
nacl is common table salt and is an ionic compound. table salt can be s…
A. it increases
-
what is the mass percent of carbon in oxalic acid, h₂c₂o₄? a. 2.24 b. 1…
c. 26.7
-
6. as you change the number of neutrons in the carbon atom, you are cre…
C. Atoms of the same element that have different numbers of neutrons. (Note: Assuming the third option is labeled C; if the original labels were different, adjust the label but ke…