Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
-
question 16 (5 points) solid zinc is added to aqueous cobalt chloride. …
D) $Zn (s) + CoCl_2 (aq) ightarrow ZnCl_2 (aq) + Co (s)$
-
question 15 (5 points) listen a chemical reaction has the equation 2nac…
D) Single displacement
-
question 14 (5 points) listen hydrogen cyanide has the chemical formula…
D) 0
-
question 13 (5 points) listen in this molecule, whats the formal charge…
A) 0
-
question 12 (5 points) which of the following elements will not form a …
A) Oxygen
-
question 11 (5 points) listen what information would you need to determ…
D. The formal charge of each atom
-
question 10 (5 points) listen how does the average reaction rate differ…
A) The average reaction rate is how quickly the reaction proceeds over time. An instantaneous reaction rate is how quickly the reaction proceeds at a specific time.
-
question 9 (5 points) listen a reversible reaction has a forward rate c…
D) 0.498
-
question 8 (5 points) listen can solid febr₂ react with cl₂ gas to prod…
B) Yes, because $\ce{Cl2}$ has higher activity than $\ce{Br2}$
-
question 7 (5 points) listen a chemical reaction has the equation 4al (…
A) Synthesis
-
question 6 (5 points) listen the compound f₂o has two lone pairs on the…
D) Bent or angular, polar
-
question 5 (5 points) covalent bonding occurs between two oxygen atoms …
C. Both oxygen atoms have zero partial charge.
-
question 4 (5 points) listen suppose a phosphorous atom forms a bond wi…
D) Polar covalent bond
-
question 3 (5 points) which portion of a molecule of f₂o has partial po…
A) The central O atom
-
question 2 (5 points) listen which process is used to produce gases fro…
C) Electrolysis
-
a reversible reaction has an equilibrium constant of 0.75. if the forwa…
B) 0.827
-
question 20 (5 points) listen isomers, such as acetic acid and methyl f…
A) the same chemical formula but different arrangements of bonds or atoms.
-
question 19 (5 points) listen an aqueous solution a) must contain three…
D. has water as the solvent.
-
question 18 (5 points) listen which of the following describes metallic…
A) It increases as you move right to left within a period and down a group on the periodic table.
-
question 17 (5 points) listen a group in the periodic table has the sam…
C. number of outer shell electrons.
-
question 16 (5 points) listen the chemical formula is different from th…
D) $\ce{H_2O_2}$
-
question 14 (5 points) listen elements in the same period a) form bonds…
D. have the same principal quantum number.
-
question 13 (5 points) listen which of the following best describes an …
A) protons in its nucleus.
-
question 12 (5 points) listen isotopes have a) a different number of el…
C. a different number of neutrons in their nuclei.
-
question 11 (5 points) listen an example of a product made from a synth…
C) a PET plastic water bottle.
-
question 10 (5 points) listen attractive forces between molecules in a …
D) weaker
-
question 8 (5 points) listen the majority of elements are a) inert. b) …
C) metals.
-
question 7 (5 points) listen you would expect magnesium to be most simi…
C) calcium.
-
which of the following viewed the atom as having a nucleus made up of p…
B) Bohr's model
-
a student found the mass of an object to be 26.5 g. to find the volume,…
C) 1.10 g/mL
-
which of the following is best described by the term macroscopic? a) wa…
D. Water in the liquid phase boils to become a gas.
-
the chemical elements display periodicity when theyre arranged accordin…
A) atomic number.
-
which fundamental principle from chemistry states different samples of …
C) Law of constant composition
-
a reaction between ethene and oxygen is used to produce epoxyethane. wh…
D. Silver is a catalyst in this reaction.
-
a certain covalent compound is named sulfur hexafluoride. whats the che…
D) \( SF_6 \)
-
which of the following statements about non - metals is correct? a) non…
A) Non - metals tend to have high ionization energy and high electronegativity.
-
question 15 (5 points) listen a certain polyatomic ion contains 49 prot…
D) \(-1\)
-
hexavalent chromium bonds with fluorine to form an ionic compound. what…
A) CrF₆, chromium(VI) hexafluoride
-
which type of chemical process is used to remove salt from ocean water?…
A) Desalination
-
which of the following compounds in the main group is an alkaline earth…
C) Calcium
-
which of the following metals is diamagnetic? a) potassium b) lithium c…
C) Barium
-
in a particular reaction, styrene is produced by removing hydrogen from…
B) Dehydrogenation
-
question 8 (5 points) which of the following metals has a low melting p…
A) Rubidium
-
the atomic number of silicon (si) is 14. whats the electron configurati…
C) \([Ne] 3s^2 3p^2\)
-
question 6 (5 points) what are the only elements that make up organic c…
D. Carbon, hydrogen, oxygen, and nitrogen
-
question 5 (5 points) which of the following statements about metal ele…
B) Metals tend to easily lose their valence electrons.
-
question 4 (5 points) which of the following statements explains the ca…
A. Protons exhibit a stronger pull on outer \( f \) orbitals than on \( d \) orbitals.
-
the atomic number of manganese (mn) is 25. whats the electron configura…
B) $[Ar]3d^{5}4s^{2}$
-
which of the following elements has the lowest ionization energy? a) ar…
B) Beryllium
-
gold and chlorine form the ionic compound aucl₃. whats the name of this…
A) Auric chloride
-
gold and chlorine form the lonic compound aucl₃. whats the name of this…
A) Auric chloride
-
for their final chemistry project at louisiana university, nodin and pe…
\(\frac{37}{3}\) minutes.
-
for their final chemistry project at louisiana university, nodin and pe…
\(V(t)=19 + 3t\)
-
a chemist equally distributes 0.5 liters of a solution among 10 beakers…
C. \(0.05\) L
-
when infants apply their schemas in novel situations, they are engaging…
Assimilation.
-
question 20 2 pts electrolytes that release hydrogen ions (h+) in water…
D. acids
-
question 22 of 45 policies attempt history current attempt in progress …
Sr, Mg
-
current attempt in progress why would you expect elements zinc, cadmium…
All of these elements have a \(s^{2}\) \(d^{10}\) electron configuration in their outermost energy levels.
-
current attempt in progress how many valence electrons do each of the f…
(a) \(4\) (b) \(6\) (c) \(1\) (d) \(7\) (e) \(3\)
-
current attempt in progress why is the last electron in potassium locat…
The \(4s\) orbital is at a lower energy level than the \(3d\) orbital.
-
current attempt in progress why is the 11th electron of the sodium atom…
The first and second energy levels are filled.
-
current attempt in progress how many orbitals exist in the fourth princ…
There are \(16\) orbitals in the fourth principal energy level. The distribution is \(1\) in \(s\), \(3\) in \(p\), \(5\) in \(d\), and \(7\) in \(f\). The \(4s\) orbital is fille…
-
current attempt in progress how many total and how many valence electro…
Total electrons: 19 Valence electrons: 1
-
6) choose the best answer. one way to shift equilibrium of a reaction i…
B. concentration of reactant(s) or products (assuming the options are labeled A, B, C, D with A: amount of time, B: concentration of reactant(s) or products, C: the reactants them…
-
4) choose the best answer. a student observes the combustion reaction o…
carbon dioxide and water ### Question 5
-
3) choose the best answer. the electrolysis of water into oxygen and hy…
decomposition reaction ### Question 4 (Note: The question text is incomplete, but assuming it's about products of methane combustion: The combustion of methane (\(\text{CH}_4\)) i…
-
2) drag and drop the reactions with the equations. so₃ + h₂o → h₂so₄ ca…
$\ce{SO_{3} + H_{2}O \to H_{2}SO_{4}}$: synthesis $\ce{CaCO_{3} \to CaO + CO_{2}}$: decomposition $\ce{Pb + FeSO_{4} \to PbSO_{4} + Fe}$: single replacement $\ce{MgCl_{2} + Li_{2}…
-
1) drag and drop the types of reactions with the descriptions when a su…
1. when a substance reacts with oxygen to create energy in the form of heat or light: combustion reaction 2. when one substance breaks down into two or more substances: decomposit…
-
11) balance the equation by typing the correct numbers in each blank. t…
2, 1, 2, 1 ### Question 12
-
8) balance the equation by typing the correct numbers in each blank. ty…
1 \( \text{AlBr}_3 + \) 3 \( \text{K} ightarrow \) 3 \( \text{KBr} + \) 1 \( \text{Al} \) ### Question 9
-
1) choose the best answer. which of these describes the law of conserva…
D. Mass cannot be created or destroyed as a result of a chemical reaction.
-
2) choose the best answer. a chemistry unit used to define the amount o…
C. mole ### Question 3
-
4) choose the best answer. which reaction between phosphorus trihydride…
(Question 4): The balanced equation (following law of conservation of mass) is \( \boldsymbol{8\text{PH}_3 + \text{O}_2 \to 2\text{P}_4\text{H}_{10} + 2\text{H}_2\text{O}} \) (the…
-
6) check the box if the statement describes the balanced or unbalanced …
To determine if each chemical equation is balanced, we check the number of each atom on both sides of the arrow. ### Equation 1: $\boldsymbol{4\text{Sb} + 3\text{O}_2 ightarrow \t…
-
7) choose the best answer. which pair of reactants would complete this …
B. $2\ce{NO} + \ce{O_{2}}$
-
1) drag and drop the terms with the descriptions. any substance that un…
1. any substance that undergoes a chemical change in a chemical reaction: reactant 2. a substance formed from another substance as a result of a chemical reaction: product 3. a co…
-
2) choose the best answer. which of these is a liquid during the chemic…
B. $\ce{Br_2}$
-
3) choose the best answer. the following shows chemical equations that …
\( \text{PbI}_2 \) (the option with \( \text{PbI}_2 \))
-
4) choose the best answer. what is the coefficient of o₂ in experiment …
3 (assuming the context of the reaction between \( CH_4 \), \( NH_3 \), and \( O_2 \) to form \( HCN \) and \( H_2O \) and the given options) ### Question 5
-
6) choose all that apply. the following chemical equation shows the for…
B. $\ce{PbCl_{2}}$ and $\ce{H_{2}O}$ are the products. D. $\ce{PbO}$ and $\ce{HCl}$ are the reactants.
-
7) choose the best answer. for their lab report, students must describe…
C. Solid zinc and lead (II) nitrate, dissolved in water, react to form aqueous zinc nitrate and solid lead. (Note: Assuming the options are labeled as A, B, C, D with the third op…
-
20. choose the best answer. two elements have an electronegativity diff…
A. ionic ### Question 21
-
due to low intramolecular forces, most covalent compounds exist as whic…
gases, liquids ### Second Question (Multiple Choice - Boiling Point of Compounds)
-
16. choose the best answer. which of these make the best conductors of …
metallic bonding (the option with "metallic bonding" text)
-
what states that the repulsion between valence - level electron pairs s…
C. VSEPR theory ### Question 2 (Second Multiple - Choice Question)
-
12. choose the best answer using the image. which type of force does la…
C. intramolecular ### Question 13
-
choose the best answers using the image. 11. choose the best answer usi…
A. intermolecular
-
9. choose the best answer using the periodic table. what is the formula…
C. \( \text{N}_2\text{O}_3 \) ### Question 10
-
7. choose the best answer using the periodic table. what is the name of…
D. magnesium phosphide ### Question 8
-
5. choose the best answer using the periodic table. which of the follow…
a compound with triple bonds
-
3. choose the best answer using the periodic table. what is the correct…
$\boldsymbol{Li_2O}$ (the option with text "Li₂O") ### Question 4
-
13. choose the best answer based on the lewis structure. how many lone …
2 (corresponding to the option "2")
-
12. choose the best answer. which is the correct lewis structure for ph…
The first Lewis structure (with P bonded to three Cl atoms, each Cl having 6 lone electrons, and P having 2 lone electrons) is correct. (Assuming the first option is labeled, e.g.…
-
11. choose the best answer based on the lewis structure. what is the ce…
oxygen
-
8. choose the best answer. which of these represents an atoms tendency …
D. octet rule ### Question 9
-
7. drag and drop the formulas with the chemical names. feo hg₂o hgo fe₂…
- \( \text{FeO} \): iron (II) oxide - \( \text{Hg}_2\text{O} \): mercury (I) oxide - \( \text{HgO} \): mercury (II) oxide - \( \text{Fe}_2\text{O}_3 \): iron (III) oxide
-
5. choose the best answer. which of these represents the three - dimens…
molecular geometry ### Question 6
-
1) choose the best answer. the three - dimensional shape of atoms in a …
B. molecular
-
2) choose the best answer. ____ theory is used to predict the shape of …
A. VSEPR ### Question 3
-
4) choose the best answer. what is the cause of the various molecular s…
the electrostatic repulsion of valence electrons ### Question 5