Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
-
atoms consist of a positively charged center called a(n) __________. * …
1. D. nucleus 2. B. electrons 3. A. neutrons
-
data table 2. vsepr names and atoms molecule or ion number of valence e…
Number of valence electrons: 32; Total number of atoms and sets of lone pairs surrounding central atom: 4; Structure geometry: tetrahedral
-
an atom containing six positive charges and six negative charges has __…
1. D. no charge 2. B. quarks
-
use this excerpt from the \a walk through the rainbow with pace\ articl…
Runoff from human - made chemicals contribute more to HABs than naturally occurring minerals.
-
what happens to the rate of diffusion with temperature ? the higher the…
The higher the temperature, the faster the rate of diffusion.
-
what is the fdas definition of its atural\ food label? produced by farm…
minimally processed and free of artificial ingredients, preservatives, and other unnaturally occurring chemicals
-
which product, according to fda labeling, is raw, unprocessed, contains…
A. fresh tomatoes
-
an atom that has gained or lost an electron is called an ion. true false
True
-
why does your whole room smell like air freshener if you only spray the…
The molecules diffuse from the source throughout the space.
-
ron is trying to work on his group potion project. in the version of ad…
For the first question: 211.90 °C For the second question: Yes the Harry is running a fever, 102.38°F For the third question: The correct answer is not provided in the options (sh…
-
the methylene blue diffused in the water. what does this mean? it moved…
It moved from a high concentration to a low concentration.
-
questions 6 through 8 refer to the following. 8 mark for review which o…
A. Thermosphere
-
a student was asked to solve the following problem: the density of liqu…
Block 1: Answer II: 18.4 g Block 2: Answer V: $\frac{1\ cm^{3}}{1.141\ g}$ Block 3: Answer III: $\frac{1\ mL}{1\ cm^{3}}$
-
you will have an unlimited number of attempts to pass this second math …
$B=\frac{3AY}{2X}$
-
write the chemical symbols for three different atoms or atomic anions w…
Ar, $Cl^-$, $S^{2 -}$
-
write the chemical symbols for three different atoms or atomic cations …
Be, B⁺, C²⁺
-
write the chemical symbols for three different atoms or atomic anions w…
Kr, $Br^-$, $Se^{2 - }$
-
which of the following is a bond between two molecules? a chemical bond…
a chemical bond in which a positively charged ion attracts a negatively charged ion
-
write the chemical symbols for three different atoms or atomic cations …
Mg, Ca²⁺, Sc³⁺
-
explain how the different particles in an atom describe the element and…
Protons define the element by determining the atomic number. Neutrons influence the isotope and stability. Electrons, particularly valence electrons, dictate chemical properties t…
-
write the chemical symbols for three different atoms or atomic anions w…
Ne, $F^-$, $O^{2 - }$
-
seeking a treatment for schizophrenia, scientists at the munsterlingen …
B. mood
-
questions 3 and 4) identify the independent and dependent variables in …
Independent Variable: 8. Number of Unpaired Electrons Dependent Variable: 7. Magnetism
-
13 during a phase change, what happens to the temperature? 14 if water …
13. The temperature remains constant. 14. Liquid. 15. Solid. 16. Gas. 17. 273.15 K. 18. 373.15 K. 19. False. Water molecules are changing phase from liquid to gas, not being destr…
-
xanthine means - organelle in which photosynthesis takes place - a yell…
A yellow chemical compound found in blood and urine
-
draw lewis structure for, $cho_2^{-}$
The Lewis structure has a carbon atom in the center. It is single - bonded to a hydrogen atom and single - bonded to one oxygen atom with 3 lone - pairs and double - bonded to ano…
-
which of the following would i use to separate oil and water, two liqui…
B. separating funnel
-
which type of equipment do you use to mix chemicals together? d. glass …
d. glass stirrer
-
5 indique si lénoncé est vrai ou faux. sil est faux, corrige - le. a) l…
a) Faux. Certains éléments existent sous forme de molécules. b) Faux. Les composés ioniques sont formés d'ions. c) Faux. Les molécules d'éléments ne sont pas des composés. d) Vrai.
-
atoms share electrons in ionic bonds. true false
False
-
which part of the atom participates in bonding? o neutron o nucleus o e…
C. electron
-
4. indique si lassertion est vraie ou fausse. a) les particules dun élé…
# Explications brèves: a) L'échantillon A est un mélange hétérogène car il peut être séparé en un solide et un liquide par filtration. b) L'échantillon B est un élément car c'est …
-
write the electron configuration for a neutral atom of magnesium.
$1s^{2}2s^{2}2p^{6}3s^{2}$
-
write the electron configuration for a neutral atom of carbon.
$1s^{2}2s^{2}2p^{2}$
-
write the electron configuration for a neutral atom of boron.
$1s^22s^22p^1$
-
which of the following is not a use of test tubes? c. accurately measur…
c. accurately measuring liquids
-
pour les deux substances proposées, coche le nom de celle qui contient …
# Explications étape par étape: ## Étape 1: Vérifier la nature des substances pour la première partie Dans la première partie, on compare la liberté de mouvement des particules. P…
-
please match the electron configuration to the correct element. 2 - 8 -…
None of the given matches are correct.
-
atomic basics part a: atomic structure 1. draw five protons in the nucl…
5. Boron 7. The number of protons in an atom 8. The sum of the number of protons and neutrons in an atom 9. The atomic number 10. Neutrons = Atomic mass - Atomic number 11. | Elem…
-
which of the following would you use to filter a mixture of sand and wa…
d. funnel and filter paper
-
which particles in an atom are found in the nucleus and have no charge?…
A. Neutrons
-
10 matching 3 points please match the electron - configuration to the c…
# Explanation: ## Step1: Recall electron - configuration basics The number of electrons in an atom is equal to its atomic number. The electron - configuration notation shows the n…
-
part 3: use lewis dot structures to show the covalent bonding in the fo…
1. Lewis structure of $NI_3$: N in the middle with 3 single bonds to I, N has 1 lone - pair and each I has 3 lone - pairs; Structural formula: $N - I_3$ with lone - pairs as dots.…
-
what is chemistry the study of? the study of historical events the stud…
The study of what matter is made of, how it's structured, and how it changes or reacts with other substances
-
which of the following are examples of things studied in chemistry? mat…
Atoms and molecules
-
chemistry shapes the future and enhances our daily lives in various way…
D. All of the above
-
part 2: use lewis dot structures to show the ionic bonding in the follo…
1) Formula: $BaO$ 2) Formula: $CaCl_{2}$ 3) Formula: $Al_{2}O_{3}$ 4) Formula: $Na_{2}O$ 5) Formula: $Na_{3}N$ 6) Formula: $Mg_{3}P_{2}$
-
10 matching 3 points please match the electron - configuration to the c…
10. 2 - 8 - 3 - 1: Phosphorus 2 - 8 - 17 - 6: Copper 2 - 8 - 18 - 8: (No correct match among given options) 11. Ground state: 2 - 6, 2 - 8 - 3 - 1, 2 - 8 - 18 - 1 Excited state: 2…
-
what are chemical reactions? when substances change into new ones with …
The first option: When substances change into new ones with different properties by rearranging their atoms.
-
chemistry is present in various aspects of daily life. which of the fol…
D. All of the above
-
10 matching 3 points please match the electron configuration to the cor…
2 - 6: Oxygen 2 - 18 - 8 - 1: Copper 2 - 7 - 6: Phosphorus (excited - state) 2 - 8 - 1 - 1: Not in options (excited - state) 2 - 8 - 3 - 1: Not in options (excited - state) 2 - 8 …
-
name: drawing ionic and covalent bonds worksheet draw the lewis dot str…
1. Ionic bond, Lewis dot structure: $Na^+[:\ddot{Cl}:]^-$ 2. Covalent bond, Lewis dot structure: $H:\ddot{O}:H$ 3. Covalent bond, Lewis dot structure: $:\ddot{Cl}:\ddot{Cl}:$ 4. I…
-
2. in the graph of atomic radius vs. atomic number what trend(s) is/are…
a. Yes, the graph supports that atomic radius is a periodic property as the trend repeats with each period. b. For the next peak in atomic radius, we would expect it for the eleme…
-
9 matching 4 points please match the electron - configuration to the co…
2 - 6: Oxygen (O) 2 - 18 - 8 - 1: Copper (Cu) 2 - 7 - 6 (assuming 2 - 8 - 7): Chlorine (Cl) 2 - 8 - 1 - 1 (assuming 2 - 8 - 1): Sodium (Na) 2 - 8 - 3 - 1 (assuming 2 - 8 - 3): Alu…
-
6 multiple choice 1 point when an electron ______ energy it falls back …
6. Releases 7. Absorbs 8. First - 2 electrons, Second - 8 electrons, Third - 18 electrons
-
multiple choice 1 point when an electron releases energy it falls back …
3. C. Ground 4. E. Photon 5. B. Spectroscope
-
you may use your notes on this quiz. you may take it three times and i …
1. Principal Energy Level 2. Excited
-
bonding basics worksheet complete the table with the appropriate inform…
| Name of the Element | Atomic Symbol | Total Number of Electrons | Number of Valence Electrons | Electrons Lost/Gained to be Stable | Oxidation Number (any correct option) | | --…
-
part 2 use lewis dot structures to show the ionic bonding in the follow…
1. N - Cl - Cl - Cl with a lone - pair on N 2. C - Br - Br - Br - Br 3. H - O - H with 2 lone - pairs on O
-
the elements argon, krypton, and xenon are all non - metals. what prope…
Poor conductor of electricity
-
the period for bromine is ____________
4
-
10. write the symbols or the names for each of these elements: chlorine…
Chlorine: Cl Zn: Zinc Copper: Cu Helium: He Potassium: K Iron: Fe Silver: Ag P: Phosphorus Na: Sodium Ne: Neon Sn: Tin Mercury: Hg
-
how do the structures of \we real cool\ and \the negro speaks of rivers…
The conciseness of both poems forces readers to pay close attention to the meaning the words convey.
-
worksheet: chemical bonding - ionic & covalent remember ionic bond: bet…
| Compound | Element 1 (metal or non - metal) | Element 2 (metal or non - metal) | Bond Type | |----|----|----|----| | $NO_2$ | Non - metal | Non - metal | Covalent | | $NaCl$ | M…
-
9. which has more protons, sulfur or iodine?
Iodine
-
8. does hydrogen have more electrons than uranium?
No
-
7. does potassium have more electrons than neon?
Yes
-
6. is mercury a heavier element than tin?
Yes
-
5. does mercury have more protons and electrons than tin?
Yes
-
draw lewis structure for, cho₂⁻
The Lewis structure of $CHO_2^-$ has a central carbon bonded to a hydrogen by a single - bond, to one oxygen by a single - bond (with 3 lone - pairs and a negative charge) and to …
-
4. how many electrons do the following have? gold____ iron____ copper__…
Gold: 79 Iron: 26 Copper: 29 Uranium: 92
-
3. how many protons do the following have? calcium gold copper iron 4. …
Calcium: 20 Gold: 79 Copper: 29 Iron: 26 Gold (electrons): 79 Iron (electrons): 26
-
introduction: the periodic table is so named because similar patterns r…
1. Largest atoms: Lower left region Smallest atoms: Upper right region Highest ionization energy: Upper right region Lowest ionization energy: Lower left region Highest electron a…
-
directions: use a periodic table to find the information asked for belo…
1. Calcium: 20, Iron: 26, Gold: 79, Uranium: 92 2. Calcium: 40.08, Iron: 55.85, Uranium: 238.03, Copper: 63.55 3. Calcium: 20
-
a. in your own words, describe hunds first and second rules that descri…
## A. Hund's first rule: Electrons fill empty orbitals first in a sub - level before pairing, with parallel spins. Second rule: Electrons in degenerate orbitals have parallel spin…
-
(02.03 mc) the diagram shows four different locations in an atom. which…
B. 2 and 3
-
(02.02 lc) ______ is a nonmetal in the periodic table. a mercury b pota…
1. c. Sulfur 2. d. 11 3. d. Group 14
-
does your shampoo leave your hair dry or damaged? flat and lifeless? th…
to persuade readers to buy Organi - Goo
-
10. investigate: choose electron affinity and select fluorine (f). in t…
- Ruler distance (for F in Gizmo): Can only be determined by performing the Gizmo experiment. - Electron - affinity (for F in Gizmo): Can only be determined by performing the Gizm…
-
(02.01 mc) the table shows the charge on three unknown subatomic partic…
c. Both particles A and B
-
6. explore: examine other groups and periods in the periodic table to s…
6. Down - group: Decrease; Across - period: Increase 7. Weaker nuclear - electron attraction due to larger radius. 8. Stronger nuclear - electron attraction due to smaller radius.…
-
question 13 what would you add to a solution to change its ph from 3 to…
Sodium hydroxide (NaOH)
-
question 12 1 pts the addition of hydrochloric acid (hcl) to an aqueous…
O. increase, decrease
-
question 10 name this molecule: fructose glycerol glycine (an amino aci…
C. glycine (an amino acid)
-
(02.01 mc) the following orbital notation is for which element? 1s 2s 2…
1. B. N 2. A. \(3s^1\)
-
2. investigate: select h. in the gizmo, the hydrogen atom is shown next…
The ionization energy decreases as we move down Group 1 from hydrogen (H) to francium (Fr).
-
(02.03 mc) the diagram shows four different locations in an atom. which…
d. 2 and 4
-
question 7 what happens to the oh- in an aqueous solution when it becom…
C. increases
-
question 8 what is this functional group called? amino carboxyl ketone …
hydroxyl
-
(02.03 mc) sulfur (s) has an atomic number of 16. what is the electron …
1. B. 1s²2s²2p⁶3s²3p⁴ 2. A. 1s²2s²2p⁶3s²
-
(02.03 lc) what is the total number of electrons that can occupy the f …
1. d. 14 electrons 2. a. three, dumbbell 3. b. 2d
-
question 5 what is the relationship between the % dye concentration and…
As % Dye Concentration increases the % Light Transmittance decreases.
-
question 4 what would be the light transmittance of a 70% dye solution …
<56%
-
slowly drag the atom towards the charge. after the electron is removed,…
3. For group 1 elements, as we move down the group, the ionization energy decreases and the distance of the outermost electron from the original position (when an electron is remo…
-
2. investigate: select h. in the gizmo, the hydrogen atom is shown next…
For group 1 elements: As we move down the group (from H to Fr), ionization energy decreases and the distance the electron moves to be removed might increase. For period elements (…
-
activity b: removing and adding electrons get the gizmo ready: • choose…
As an atom's size (atomic radius) increases, its ability to hold on to its valence electrons decreases because the increased distance between the nucleus and valence electrons wea…
-
10. analyze: consider how the number of protons might affect the size o…
10.D. As the attractive force between the nucleus and electrons increases, the electrons are pulled closer to the nucleus, resulting in a decrease in atomic radius across a period…
-
adding which ingredient creates a higher fountain? rock salt mentos rew…
# Breve explicación: Los Mentos crean una reacción más violenta con el gas en las bebidas carbonatadas, lo que resulta en una fuente más alta. La sal de roca también puede causar …
-
d. how does your answer to the previous question explain the trend in r…
A. Sodium loses an electron, so remaining electrons are pulled in more tightly, making the ion smaller. B. Chlorine gains an electron, increasing electron - electron repulsions an…
-
question 1 of 20 which element was first discovered on the sun? uranium…
C. helium