Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
-
defensins, collectins, and complement are examples of: a chemical barri…
A. Chemical barriers
-
the skin and mucous membranes are examples of: a chemical barriers b me…
B. Mechanical barriers
-
7. fill in the blanks below with the following terms: “greater”, “equal…
a. equal values of b. greater c. less 8. $Q=p - e$ (where $Q$ is the charge of the particle, $p$ is the number of protons and $e$ is the number of electrons)
-
6. which country spends the highest percentage of income on food (from …
6. C. Pakistan 7. B. Irrigation using river floods (like the Nile) 8. C. Focused on efficiency, technology, and global connections
-
4, which particle(s) affect the atomic mass of your atom? what effect d…
4. Protons and neutrons affect the atomic mass of an atom. Protons have a mass of approximately 1 amu and neutrons have a mass of about 1 amu, contributing to the overall mass of …
-
for the following, play around with the simulation to answer the follow…
1. Protons and neutrons are in the center; electrons are outside. 2. Protons. 3. a. Lithium b. Helium c. Beryllium
-
instructions: answer the following questions about the reading. 1. what…
1. A. Building foundations 2. B. Protons and neutrons 3. The analogy shows atoms combine like LEGO bricks to form molecules. 4. Nucleus has protons (+) and neutrons (neutral), ele…
-
18) find the volume of 0.110 mol l-1 hydrochloric acid necessary to rea…
D. 0.530 L
-
slide 14: practice: $^{18}_{8}o$ atomic number = # of protons = # of ne…
Atomic Number = 8 # of Protons = 8 # of Neutrons = 10 # of Electrons = 8
-
17) combustion analysis of 63.8 mg of a c, h, and o - containing compou…
A. $C_3H_6O$
-
slide 15: practice: $_{35}^{82}br$ atomic number = # of protons = # of …
Atomic Number = 35 # of Protons = 35 # of Neutrons = 47 # of Electrons = 35 Mass Number = 82 Name Notation = bromine - 82
-
slide 12: practice: carbon - 13 atomic number = 6 # of protons = 6 # of…
For $^{18}_8O$: Atomic Number = 8, # of Protons = 8, # of Neutrons = 10, # of Electrons = 8, Mass Number = 18, Name Notation = Oxygen For $^{82}_{35}Br$: Atomic Number = 35, # of …
-
a student claims that carbon dioxide (co₂) is an ionic compound because…
The claim is incorrect because carbon and oxygen are non - metals and form covalent bonds in $CO_2$ by sharing electrons, not ionic bonds which require a metal and a non - metal w…
-
the number of protons in an element is also called its? valence number …
B. atomic number
-
multiple choice 1 point which element has similar properties to calcium…
D. Magnesium (Mg)
-
identify the number of protons, electrons, and neutrons in carbon-12. p…
Protons: 6 Electrons: 6 Neutrons: 6
-
a halogen that reacts with sodium to form salt. a non - metal used in c…
1. Chlorine 2. Silicon 3. Potassium 4. Helium
-
read it! weathering of rocks - questions 1 what is the best description…
1. D. When water freezes, thaws, and breaks up rocks 2. A. All About Mechanical Weathering 3. A. Freeze thaw, salt wedging
-
the periodic table is arranged in order of increasing: density atomic m…
C. Atomic number
-
13) an ion has 22 protons, 26 neutrons, and 19 electrons. the symbol fo…
E. 17O2+ (Note: There is likely an error in the problem as the correct element with 22 protons is titanium and the correct ion should be \(Ti^{3+}\), but among the given options, …
-
determine which of the following electron configurations are not correc…
11. I 12. C
-
for the following electron configurations determine the element they re…
9. Bromo (Br) 10. Niquel (Ni)
-
write a ground state electron configuration for these ions. remember th…
# Explicación paso a paso: ## Paso1: Determinar electrones de fósforo neutro El fósforo (P) tiene 15 electrones. El anión P³⁻ tiene 15 + 3 = 18 electrones. La configuración es 1s²…
-
28 multiple choice 1 point select the most reactive element. mg cs sr na
B. Cs
-
read the excerpt from a speech on the benefits of eating organic versus…
"chemicals", "disease", "obesity"
-
determine which element these letter number sequences refer to. 3. 4p³ …
3. Arsénico (As) 4. Polonio (Po)
-
determine the last letter - number sequence for the following elements.…
1. $5p^5$ 2. $6s^1$
-
orbital notation & electron configurations of ions practice eq: can i d…
# Explicación: ## Paso1: Saber que cloro tiene 17 electrones Los primeros 2 electrons van al nivel 1s, los siguientes 8 al nivel 2 (2s²2p⁶) y los últimos 7 al nivel 3 (3s²3p⁵), es…
-
8. who proposed the planetary model of the atom? a. schrodinger b. heis…
b. Barium ### 2. Question about the number of valence electrons of magnesium
-
chemistry - test a - electrons in atoms equations: c = λv & e = hv c = …
1. b. number of valence electrons 2. c. 8 3. c. position, velocity 4. b. A series of colored lines that represent the energies of the origin of the atom. 5. c. Fluorine 6. b. [Ar]…
-
13. what is the maximum number of electrons that can occupy a single or…
13. B. 2 14. A. A wave and a particle 15. B. The electron has absorbed energy and moved to a higher energy level 16. B. Electrons exist in orbitals, which are probability regions …
-
19. what is the maximum number of electrons that can occupy the 2p subl…
19. C. 6 20. A. $1s^22s^22p^63s^23p^6$
-
21. define valence electrons and explain why they are important. 22. co…
Valence electrons are the electrons in the outermost shell of an atom. They are important for determining an atom's chemical reactivity and bonding behavior. ### 22.
-
26 multiple choice 1 point select the most reactive element. f cl br i
F
-
complete the table below, using the diagram of an atom shown at right. …
| name | symbol | charge (in multiples of $e$) | approximate mass (amu) | location on diagram | |--|--|--|--|--| | electron | $e^-$ | - 1 | 0 | B | | neutron | $n^0$ | 0 | 1 | A |…
-
arrange the highlighted bonds in the table below in decreasing order of…
H - F: 1 N - H: 2 C - H: 3
-
how many valence electrons are in al⁺?
2
-
decide whether each sketch shows a sample of an element, a compound, or…
Substance X: mixture Substance Y: compound Substance Z: element Substance T: compound
-
25 multiple choice 1 point select the most reactive element. na rb k fr
D. Fr
-
read each description in the first column of the table below. if any ch…
| description | Does any element with \(Z\leq92\) match the description? | If you checked yes, give the symbol of an element with \(Z\leq92\) that matches. | | --- | --- | --- | |…
-
19. use the standard enthalpies of formation to determine the standard …
C. $92.22\ kJ\ mol^{-1}$
-
for each pair of compounds listed, check the box next to the one with t…
$GeCl_4$; $CF_4$; $CH_3(CH_2)_4CH_3$
-
below is the lewis structure of the hydrogen cyanide (hcn) molecule. h …
bonding pairs: 3 lone pairs: 1
-
17. a piece of gold with a mass of 21.0 g was heated to 100.0 °c and pl…
A. 28.4 g
-
22 multiple choice 1 point select the most electronegative atom. f cl b…
A. F
-
draw the lewis structure for methanol (ch4o). methanol molecules have o…
H | H - C - O - H | H with two lone - pairs on the oxygen atom.
-
write the empirical formula of at least four binary ionic compounds tha…
ZnF₂, ZnS, FeF₂, FeS
-
draw the lewis dot diagram for a h+ cation.
(No dots, just the symbol H with a + sign to represent the positive charge, e.g., $H^{+}$)
-
question 5 of 10 which of the following factors most directly contribut…
A. Uneven shape
-
question 4 of 10 which of the following properties of water is the resu…
C. Cohesion
-
question 3 of 10 which of the following substances is most likely to be…
D. A polar substance capable of forming hydrogen bonds
-
question 2 of 10 which of the following correctly describes a hydrogen …
C. A bond between hydrogen and another atom
-
question 134 \placebo\ literally means: o believe please o no please o …
Question 134: shall please Question 135: psychosomatic Question 136: anesthesia
-
linear parent function f is graphed on the grid. if h(x)=\\frac{1}{2}f(…
11
-
clue #6 the graph of the function (f(x)=x) is transformed to form the g…
Function \(f\) was reflected over the \(x\) - axis, vertically compressed, and translated down 1 unit.
-
21 multiple choice 1 point select the most electronegative atom. ca i h…
I. Iodine
-
11. identify the reducing agent in the following reaction? zno(s) + c(s…
B. $C(s)$
-
multiple choice question the chemical signals used by the hypothalamus …
A. releasing hormones
-
19 multiple choice 1 point select the most electronegative atom. cl se …
A. Cl
-
18 multiple choice 1 point select the most electronegative atom. o b li…
A. O
-
name _ date: _ pd _ nuclide symbols hw complete the following chart: na…
| Name of Isotope | Nuclide Symbol | Mass Number | Atomic Number | Number of Protons | Number of Electrons | Number of Neutrons | |---|---|---|---|---|---|---| | Potassium - 41 | …
-
conclusion section 1. in general, how does atomic radius change across …
1. Atomic radius decreases across a period from left to right because of increased nuclear charge pulling electrons closer. 2. Atomic radius increases from top to bottom within a …
-
16 multiple choice 1 point select the atom with the highest ionization …
D. N
-
14 multiple choice 1 point select the atom with the highest ionization …
C. Se
-
12 multiple choice 1 point select the atom with the highest ionization …
Be
-
9. rank the following elements by decreasing atomic radius: barium, mer…
Barium, Tungsten, Polonium, Mercury
-
pre - lab section 1. define period. 2. define group. 3. define atomic r…
1. A horizontal row in the periodic table where elements have the same number of electron - shell levels. 2. A vertical column in the periodic table with elements having similar c…
-
water vocabulary: drag and drop the words to the correct term 1. by che…
1. Molecule 2. Polarity 3. Solvent 4. Solute
-
8. rank the following elements by decreasing atomic radius: antimony, i…
Zirconium, Indium, Antimony, Xenon
-
water vocabulary: drag and drop the words to the correct term. 1. by ch…
1. Molecule 2. Polarity 3. Solvent 4. Solute
-
water vocabulary: drag and drop the words to the correct term. 1. by ch…
1. Molécula 2. Polaridad 3. Solvente (no está en las opciones pero se asocia con "parte de una solución - un disolvente; la mayor") 4. Agua (no está en las opciones pero se asocia…
-
8. rank the following elements by decreasing atomic radius: antimony, i…
thallium, indium, gallium, boron
-
mini glossary cleavage: a break in a mineral along a smooth, flat surfa…
1. Quartz has a crystal - like structure and a glassy luster. 2. Naturally occurring, Inorganic, Solid, Has a crystal structure, Has a definite chemical composition 3. The rate of…
-
multiple choice 1 point select the atom with the largest atomic radius.…
Sr
-
12. describe the trend for electronegativity as you move from left to r…
Electronegativity increases from left to right within a period on the periodic table due to an increase in nuclear charge and a constant number of electron shells.
-
6. drawing an ion element: lithium 1. draw lithium atom 2. answer the q…
**Lithium**: - Number of valence electrons: 1 - Will it gain or lose electrons: Lose - Number of electrons lost: 1 - Charge on ion: + 1 **Oxygen**: - Number of valence electrons: …
-
9. the first step in the ostwald process for producing nitric acid is n…
B. 77%
-
multiple choice 1 point select the atom with the largest atomic radius.…
C. Ba
-
which of the following happen during this change of state? select all t…
The particles in the substance move far apart.
-
what volume of carbon dioxide could be produced at 10.0 degrees celsius…
$694\ L$
-
what is chemical energy? the energy associated with the motion of sampl…
Part A: A form of potential energy associated with the positions of the particles that compose the chemical system. Part B: - The burning of natural gas. - The burning of gasoline.
-
7. if the density of lead (pb) is 11.34 g/cm³, how many lead atoms are …
C. $1.32\times 10^{24}$ atoms
-
part a a 25.3 g sample of silver initially at 22.5 °c absorbs 150.0 j o…
A. $47.5^{\circ}C$
-
1. find the key at the top of the page. what does each color represent …
1. Without seeing the key, we can't give specific color - charge relationships. But generally, red might indicate partial negative charge and blue might indicate partial positive …
-
ionic or molecular? 1. identify the types of atoms in each compound as …
| Chemical formula | Metal or non - metal elements? | Ionic or molecular compound? | |---|---|---| | SrCl₂ | Metal (Sr), Non - metal (Cl) | Ionic | | P₂O₃ | Non - metal (P), Non -…
-
the following text is adapted from herman melvilles 1857 novel the conf…
B. It presents an account of a misunderstanding.
-
identify the species oxidized, the species reduced, the oxidizing agent…
Species oxidized: $Co$ Species reduced: $Sn^{2+}$ Oxidizing agent: $Sn^{2+}$ Reducing agent: $Co$ Electrons are transferred from: $Co$ to: $Sn^{2+}$
-
match each species on the left to a description on the right. clear all…
$H_2O_2$ - oxidizing agent $Al$ - reducing agent $MnO_4^-$ - oxidizing agent $Zn$ - reducing agent
-
54. which of the following is a conditional amino acid? tyrosine aspara…
54. Tyrosine 55. They dissolve easily in water.
-
ni^{2 + }+so_{4}^{2 - }\to nio_{2}+so_{2} in the above redox reaction, …
Name of the element oxidized: Nickel Name of the element reduced: Sulfur Formula of the oxidizing agent: $\text{SO}_{4}^{2 - }$ Formula of the reducing agent: $\text{Ni}^{2 + }$
-
use the following information to answer the next two questions. a sampl…
2. 6.00 L 3. 6.00 L
-
1. a 4.05 g sample of a compound containing c, h, and o was burned comp…
B. $C_7H_{14}O$
-
elements diary choose an element from the periodic table and write a se…
For example, if we choose oxygen (O): **Day 1** I am Oxygen, a member of Group 16, also known as the chalcogens. Life in this group is interesting. We all have a strong desire to …
-
the density of a gas under constant pressure depends on temperature. ho…
(a) Domain: $0, 27, 60, 80, 115$; Range: $1.464, 1.274, 1.201, 1.101, 1.016$ (b) $0 ightarrow1.464$, $27 ightarrow1.274$, $60 ightarrow1.201$, $80 ightarrow1.101$, $115 ightarrow1…
-
classify the following reaction and balance the equation by entering th…
$2$; $1$; $1$; $2$
-
1. carbohydrates are inorganic compounds. true false 2. symptoms of a h…
1. False 2. Drop in heart rate 3. False
-
19) one serving of alcohol (beer, wine, or liquor) contains roughly ___…
19) C. 15 20) A. Fermentation
-
for the following reaction, 67.1 grams of silver nitrate are allowed to…
What is the maximum amount of silver chloride that can be formed? 53.6 grams What is the FORMULA for the limiting reagent? $CuCl_2$ What amount of the excess reagent remains after…
-
use the following information to answer the next question. 1. ideal gas…
1468
-
18 question (1 point) complete the fischer projection that matches the …
Without the actual correct placement shown in the answer options, a specific answer cannot be given. But the process involves carefully analyzing the spatial orientation of groups…