Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
-
who first arranged the periodic table, and what does this table display…
A. Dmitri Mendeleev, elements and their masses
-
4. match the descriptions with the terms. specific types of atoms or mo…
1. Elements 2. Protons 3. Condensation 4. Neutrons 5. Electrons 6. Deposition
-
the smallest parts of matter that still contain all the properties of t…
A. atoms
-
in which change of state does a solid change to a gas without going to …
C. sublimation
-
name julia radar period 7in date 3/22/25 gay - lussacs law computer act…
1. Sin la simulación abierta, no se puede determinar el número de partículas de gas agregadas. No se especifica el tipo de gas agregado. Las partículas se mueven aleatoriamente en…
-
4) how long will it take (in seconds) for 45.0g of mg to react with hcl…
1175 s ### 5)
-
a can of mixed nuts is an example of a(n) ____ change. chemical environ…
D. physical
-
the illustration shows an arrangement of ____ particles in a solid. cry…
crystalline
-
which one of these would be considered an investigation? a measuring th…
A. Measuring the pH of common household chemicals, B. Observing the effects of different track surfaces on the speed of a go - cart, C. Investigating the effects of different amou…
-
a ____ change results in a substance changing size or shape while remai…
D. physical
-
the measure of the damage a substance can cause to an organism through …
A. toxicity
-
the only substance that exists naturally in all three forms of matter i…
D. water
-
the simplest and most common element in the universe causes the sun to …
A. hydrogen
-
____ change results in a new substance and cannot be reversed. physical…
D. Chemical
-
burning a wood log is an example of a(n) ____ change. scientific physic…
D. chemical
-
1. which of the following statements is true about elements and compoun…
1. D. 2. A. 3. A.
-
in the bohr model of the atom, electrons are arranged in fixed orbits c…
a. absorb b. emit c. are at their highest energy level d. are at their lowest energy level
-
3. los estados más comunes de la materia en la tierra son sólido, líqui…
- Estado sólido: Fusión (cambio a líquido por calor) y sublimación (cambio directo a gas). - Estado líquido: Evaporación (cambio a gas) y solidificación (cambio a sólido por pérdi…
-
1) the above is data for a reaction in which pb is a reactant. a) calcu…
1. a. The overall rate of the Pb - reaction is approximately 0.67 g/s. b. Rate from 0 - 30s is 0.8 g/s and from 30 - 60s is approximately 0.53 g/s. c. The 30 - 60s rate is lower b…
-
questions 1. i am a chemical formula that consists of at least two diff…
1. Compound 2. Compound 3. Element 4. Elements: hydrogen (H), oxygen (O); Compounds: water (H₂O), carbon - dioxide (CO₂) 5. No, only elements are on the periodic table.
-
find the relative clause. if it is nonrestrictive, set it off with comm…
When adding organic materials to a compost pile, gardeners should avoid animal products and fats in favor of scraps from plants that have not been treated with pesticides.
-
2. begin the simulation. as you complete the graphic organizer in the s…
1. Element, Compound, Molecule 2. Element 3. Compound 4. Molecule 5. Element, Compound 6. Element 7. Compound, Molecule 8. Element 9. Compound, Molecule
-
given a mixture of pentane and pentane - 1,2,3 - triol, which of the fo…
I. cyclohexane
-
use the following information to answer the next question. given the fo…
$2.22$
-
use the following information to answer the next question. the reaction…
3.00
-
12. determine the chemical amount of silver produced when 118 g of zinc…
3.61 moles
-
11. when does a chemical reaction stop? when the excess reactant is use…
D. When the limiting reactant is used up.
-
camille set 15 drinking glasses on her countertop. she poured the same …
When sugar is added to water, does the water’s temperature affect the amount of time it takes the sugar to dissolve?
-
10. given the reactants, _al₂(so₄)₃(aq) + _pb(s) → predict the unbalanc…
$PbSO_4(aq)+Al(s)$
-
use the following information to answer the next question. according to…
2.36 moles
-
8. a student completes an analysis of a chemical reaction between magne…
2.63
-
7. the number of moles present in 90.0g of lead(iv) oxide is 2.66 moles…
0.376 moles
-
6. if 60.0 g of barium and 5.00 g of phosphorus are available to react,…
phosphorus
-
multiple choice 5. which compound has the largest molecular mass? □ zn(…
$Zn(H_2PO_4)_2$
-
use the following information to answer the next question. in an experi…
84.0%
-
3. a lab technique that allows you to separate a precipitate from solut…
Filtration
-
multiple choice use the following information to answer the next questi…
2 and 4
-
1. when the equation for the complete combustion of propene (c₃h₆(g)) i…
9
-
the passage below describes an experiment. read the passage and then fo…
a dependent variable
-
ms. jacksons class is learning about compounds. a specific molecule is …
6:5
-
in the center of matterville, there is a place called the nucleus arcad…
The morale of Matterville would be disrupted as the balance between negative Electrons and positive Protons is broken.
-
in the center of matterville, there is a place called the nucleus arcad…
The morale of Matterville would be disrupted as the balance between negative electrons and positive protons would be lost.
-
part c: electron configuration 12. how many electrons can each level ho…
12. 2, 8, 8 13. Valence electrons 15. - Li: # of P = 3, # of N = 4, # of E = 3 - Ne: # of P = 10, # of N = 10, # of E = 10 - Mg: # of P = 12, # of N = 12, # of E = 12 - Cl: # of P…
-
substance appearance odour hardness dissolves in water? conductivity in…
| Substance | Ionic or molecular? | |--|--| | moth balls | molecular | | sodium thiosulfate | ionic | | antifreeze | molecular | | potassium permanganate | ionic | | benzoic acid …
-
atomic basics part a: atomic structure 1. draw five protons in the nucl…
| Element | Atomic Number | Atomic Mass | Protons | Neutrons | Electrons | | ---- | ---- | ---- | ---- | ---- | ---- | | Li | 3 | 7 | 3 | 4 | 3 | | P | 15 | 31 | 15 | 16 | 15 | | …
-
the closeness of particles of gas and their low speeds allow intermolec…
This is a limitation of the kinetic - molecular theory.
-
which event is most likely occurring? o diffusion because particles mov…
diffusion because particles move from regions of high concentration to regions of low concentration
-
which observation indicates that the kinetic - molecular theory has lim…
Increasing collisions of gas molecules will increase energy between them.
-
the table below gives some characteristics of element y. |characteristi…
B. B
-
what is the atomic number of zirconium? 39 40 41 42
B. 40
-
which best explains why ionization energy tends to decrease from the to…
Electrons get farther from the nucleus.
-
which element is classified as an alkali metal? rb sr zr cl
A. Rb
-
which is a correct set of values of m for one of the subshells of n = 2…
-1, 0, 1
-
which statement best describes how electrons fill orbitals in the perio…
Electrons fill orbitals in order of their increasing energy from left to right.
-
in which orbitals would the valence electrons for selenium (se) be plac…
s orbital and p orbital
-
to show the electron configuration for an atom, when would it be better…
when the aim is to show electron spins
-
a single atom of an element has 11 protons, 11 electrons, and 12 neutro…
B. Na
-
which substance is a mixture? o table salt o gasoline o aluminum o carb…
gasoline
-
when electrons are removed from the outermost shell of a calcium atom, …
a cation that has a smaller radius than the atom.
-
which pure substance can be classified as an element? o h₂ o no₃ o nacl…
$H_2$
-
which element has the largest atomic radius? o as o n o p o sb
Sb
-
among the elements of the main group, the general trend in the first io…
The ionization energy decreases because the full s orbital shields the electron entering the p orbital.
-
which physical method can be used for obtaining a sample of salt from a…
boiling
-
how many valence electrons does aluminum (al) have available for bondin…
C. 3
-
air is made up of different gases, such as oxygen, nitrogen, and carbon…
Oxygen, nitrogen, and carbon dioxide are all classified as pure substances.
-
which element has 32 protons in its nucleus? phosphorus cobalt germaniu…
germanium
-
which of the following symbols would be included in the noble gas notat…
B. Kr
-
the elements of which group are nonreactive? halogens alkaline earth me…
C. noble gases
-
hydrogen has three isotopes ¹h, ²h, and ³h. what is the difference betw…
The number of neutrons ranges from 0 to 2.
-
which element is the most reactive? o sodium o nickel o carbon o oxygen
sodium
-
which set of numbers gives the correct possible values of l for n = 2? …
0, 1
-
which characteristic is given by the angular momentum quantum number? o…
orbital shape
-
what is an example of a chemical change?
Burning wood
-
which element would release the most energy while adding an electron to…
C. Br
-
which would least strongly attract electrons from other atoms in a comp…
elements of group 1
-
electronegativities of the elements na, al, p, and cl follow a specific…
Cl
-
electronegativities of the elements be, mg, ca, and sr follow a specifi…
Sr
-
which element has a larger atomic radius than sulfur? chlorine cadmium …
B. cadmium
-
how does a lithium cation compare to a lithium atom? the cation is larg…
The cation is smaller.
-
which explains the change in ionization energy that occurs between remo…
The ionization energy increases because the ratio of the protons to electrons increases.
-
among the elements of the main group, the first ionization energy incre…
A. from left to right across a period.
-
which element has the smallest atomic radius? calcium potassium scandiu…
D. titanium
-
which element would most likely have an electron affinity measuring clo…
Ar
-
21. the table below describes four atoms. atom a atom b atom c atom d n…
B. A and D represent the same element
-
which element does the electron configuration 1s²2s²2p² represent? o b …
B. C
-
what does a catalyst do in a chemical reaction?
A catalyst lowers the activation energy and increases the rate of a chemical reaction without being consumed.
-
which is the noble gas notation for chlorine? ne 4s² 4p⁵ ne 3s² 3p⁵ ne …
[Ne] 3s² 3p⁵
-
the electron configuration of nitrogen (n) is 1s²2s²2p³ 1s²2s²2p⁴ 1s²2s…
1s²2s²2p³
-
how many valence electrons does lithium (li) have available for bonding…
1. Option Text
-
it is easier to determine the electron configurations for the p - block…
their electrons are assigned to s and p orbitals only.
-
hydrogen reacts with an element to form a compound. which element would…
B. chlorine
-
what is the number of valence electrons in cadmium (cd)? 1 2 10 12
2 (corresponding to the second option in the multiple - choice)
-
in which block of the periodic table is chromium (cr) found? s block d …
B. d block
-
which is the electron configuration for nobelium (no)? rn7s²5f¹⁴ rn7s²5…
[Rn]7s²5f¹⁴
-
in which block of the periodic table is uranium (u) found? ○ s block ○ …
f block
-
what is the difference between a chemical change and a physical change?
A chemical change creates new substances with different chemical properties by changing chemical bonds. A physical change only modifies physical properties without altering chemic…
-
what is an atom made up of?
An atom is made up of a nucleus containing protons and neutrons, with electrons orbiting the nucleus.
-
what careers use chemical reactions to solve problems?
Chemist, Chemical engineer, Pharmacist
-
a) chlore et magnésium. b) silicium et oxygène. c) soufre et sodium. d)…
### a) $NaOH$, Hydroxyde de sodium ### b) $NH_4F$, Fluorure d'ammonium ### c) $K_2CO_3$, Carbonate de potassium ### d) $LiNO_3$, Nitrate de lithium ### e) $Ca_3(PO_4)_2$, Phosphat…
-
a) chlore et magnésium. b) silicium et oxygène. c) soufre et sodium. d)…
a) Formule chimique : $MgCl_{2}$, Nom du composé : Chlorure de magnésium b) Formule chimique : $SiO_{2}$, Nom du composé : Dioxyde de silicium c) Formule chimique : $Na_{2}S$, Nom…