化学
化学反応、化学量論、分子構造、元素の性質。
-
name the following acids. 1 hcl 2 hno₃ 3 h₂so₄ 4 h₃po₄ 5 hf 6 hbr 7 h₂s…
Acids: 1. Hydrochloric acid 2. Nitric acid 3. Sulfuric acid 4. Phosphoric acid 5. Hydrofluoric acid 6. Hydrobromic acid 7. Sulfurous acid 8. Chloric acid 9. Phosphorous acid 10. C…
-
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.
-
name: surname: elements, compounds, and mixtures (worksheet) q.1. write…
Q1: 1. F 2. T 3. T 4. F Q2: a) element b) compound c) mixture d) heterogeneous mixture e) homogeneous mixture
-
b) combien datomes y a - t - il dans 5,00 mol de soufre?
$3,011\times10^{24}$ atomes
-
q.10. how many different atoms are there in the following molecule? a) …
Q.10: d) 8 Q.11: c) Soil Q.12: b) Lemonade
-
q.6. which one of the following is an element? a) gold b) water c) pure…
Q.6: a) Gold Q.7: a) Pure Water Q.8: d) 24 Q.9: c) compound
-
name: surname: q.5. which of the diagrams below represent a mixture?
b)
-
4. based on the concept of periodic trends, answer the following questi…
4. a. Na b. Be c. Na 5. a. F b. F c. P 6. Group 18 7. a. the 4s electrons 8. Silicon (Si) 9. d. occupied principal energy levels 10. a. decreases and the atomic radius increases
-
shown is a set of problems in a chemistry class. (a) how many atoms are…
(a) D. $3.22\times 10^{23}$ atoms (b) E. $0.145$ moles (c) B. $48.6$ g Last question: b
-
question 6 (2 points) o 15.999 c 12.011 h 1.008 x 13.665 z 29.456 n 14.…
58.77
-
question 5 (2 points) how many moles are in 1.40x10^22 formula units of…
$0.0233$
-
how many moles are in 12 g of potassium permanganate (kmno₄)? report yo…
Blank 1: 12 g Blank 2: 1 mol Blank 3: 158.0 g Blank 4: 0.076 mol
-
what is the mass of 5.60x10^23 molecules of sf₆? (round your answer to …
$135.8$
-
match the questions to the correct answers. column a 1. how many partic…
1. a. $3.91\times 10^{23}$ 2. e. $64.6$ 3. d. $95.2$ 4. b. $3.17\times 10^{24}$
-
a balloon holds 0.54l of nitrogen gas (n2) at stp. how many grams and m…
F. 0.80 grams, 1.7x10²² molecules
-
read the excerpt from act 1, scene 3, of julius caesar. cassius. and wh…
Cassius portrays Caesar as a cruel - hearted tyrant, and at the same time says he pities Caesar because Caesar can't help himself.
-
in a reading, you come across a lithium atom represented as li⁺. a neut…
The lithium atom has lost an electron, so it now has 3 protons and 2 electrons.
-
in order to observe your crystals as they grow, you... use your estimat…
use your five senses.
-
in this activity, you applied your understanding of the scientific meth…
what type of salt forms the largest crystals.
-
question 1 in a reading, you come across a lithium atom represented as …
The lithium atom has gained an electron, so it now has 3 protons and 4 electrons.
-
directions: read each prompt carefully and answer to the best of your a…
1. Materia 2. Átomos 3. Elemento 4. Compuesto químico 5. Mezcla 6. Propiedad física 7. Reacción física 8. Fusión 9. Calor (Energía térmica)
-
27) how many neutrons are present in c - 14? a) 14 b) 8 c) 12 d) 6 e) n…
27) B. 8 28) A. 17 protons, 20 neutrons 29) D. 82.5 amu 30) A. 75.95%
-
20) all of the following statements about different elements are true e…
20) B. Sulfur is considered a metalloid. 21) B. zig - zag diagonal line 22) D. Cations are formed when an atom gains protons. 23) D. 36 24) B. 2+ 25) A. 1+ 26) A. protons and neut…
-
13) which of the following statements about the nature of electrical ch…
13. E. All of the above statements are true. 14. E. none of the above 15. B. left side 16. B. halogens 17. A. alkaline earth metals 18. A. noble gases 19. C. a cation
-
true/false. write t if the statement is true and f if the statement is …
1. T 2. F 3. F 4. F 5. T 6. T 7. T 8. F 9. T 10. F 11. C. Most of the atom's mass and all of its positive charge is contained in a small core called the nucleus. 12. B. Most all o…
-
sujeto aseoramiento materia y reacciones ¿qué es una propiedad química?…
# Breve explicación: - Todas las materias están hechas de átomos. - Las partículas indivisibles de las que está hecha la materia son átomos. - Una sustancia hecha enteramente de u…
-
part 1: matching match the term on the left with the correct descriptio…
1. D 2. A 3. C 4. F 5. G 6. B 7. E 8. H
-
hazlo ahora1.9 instrucciones: responda las siguientes preguntas con ora…
# Explicación paso a paso: ## Paso 1: Resolver pregunta 1 Un átomo es una partícula elemental, una molécula es una combinación de átomos y un compuesto es una molécula formada por…
-
reading questions: click here to access the article. read it and then a…
1. Electrons absorb energy, move to excited states, then return to lower levels emitting photons of specific energies corresponding to flame colors. 2. It tells us that each metal…
-
question 20 (1 point) the chemical formula for butyne would be c₄h₈ c₄h…
D. $C_4H_6$
-
5. choose the best answer. what elements are in nacl? nickel and carbon…
B. chlorine and sodium
-
which of the following would most likely be considered combustible? sym…
C. gasoline
-
there are 118 different elements in the periodic table. while giving a …
8.5%
-
which example of medication administration is considered chemical restr…
Medications that are not a standard part of the patient's treatment that are given to control behavior
-
2. the mass spectrum for elemental bromine is represented below. label …
The peaks around m/z = 80: $^{79}$Br$^+$, $^{81}$Br$^+$; The peaks around m/z = 158: $^{79}$Br$^{79}$Br; The peak around m/z = 160: $^{79}$Br$^{81}$Br; The peak around m/z = 162: …
-
question 19 (1 point) what is the iupac name for the compound ch₃ - ch …
E. 2 - pentene
-
hexane, 2,3 - dimethylbutane, and 2 - methylpentane are constitutional …
hexane > 2 - methylpentane > 2,3 - dimethylbutane
-
what is the iupac name for the following cyclic alkane? 1 - ethyl - 3 -…
1 - ethyl - 3 - propyl - 5 - methylcyclohexane
-
which of the following are saturated hydrocarbons? alkenes aromatic hyd…
C. alkanes
-
there are ______ carbons in the longest continuous chain of carbons in …
C. 8 (eight)
-
average atomic mass from the textbook, read section 3.2 and, on pages 1…
The elements present are germanium (Ge) and silver (Ag).
-
what is the iupac name of this molecule? 5 - ethyl - 3,5 - dimethylhexa…
3,3,5 - trimethylheptane
-
what is the classification of each labeled carbon atom in this structur…
C1 is a $2^{\circ}$, C2 is $3^{\circ}$, C3 is a $3^{\circ}$, and C4 is $4^{\circ}$
-
which of the following is not a constitutional (structural) isomer of p…
cyclopentane
-
question 11 (1 point) which formula represents an acyclic alkane? c₉h₁₈…
$C_{12}H_{26}$
-
question 10 (1 point) the compound below is classified as what type of …
D. ester
-
question 11 (1) write the suffix, if there is one, in each term (in cor…
1. -ia 2. A condition or state
-
what is the correct molecular formula for the structure shown below? c₁…
$C_{12}H_{12}O_{2}$
-
parts of the atom atoms are made of three subatomic particles: protons:…
Protons: Positive Neutrons: Neutral Electrons: Negative
-
what is the condensed formula for the molecule shown below?
$(CH_3)_2CH_2$
-
which structure is not possible?
(Without labels on the structures, it's not possible to directly point out which one. But the general approach is to look for atoms with incorrect valencies. For example, if a car…
-
which structure has all of the hydrogen atoms correctly added to the co…
(Please provide the options clearly as the image is not fully legible for me to determine the correct answer among them. Once the options are provided clearly, I can give the spec…
-
type the number of each subatomic particle into the blanks: protons:? n…
Protons: 9 Neutrons: 10 Electrons: 9
-
which structure has all of the hydrogen atoms correctly added to the co…
(No options are clearly labeled in the provided image. If we assume the options are the different structures shown below the question, we would need to analyze each one based on c…
-
type the number of each subatomic particle into the blanks: protons: 6 …
Neutrons: 6 Electrons: 6
-
what are the bond angles in the structure shown below? angle 1 = 109.5°…
Angle 1 = $109.5^{\circ}$, Angle 2 = $109.5^{\circ}$, and Angle 3 = $120^{\circ}$
-
type the number of each subatomic particle into the blanks: protons pro…
Boron: Protons: 5, Neutrons: 6, Electrons: 5 Nitrogen: Protons: 7, Neutrons: 7, Electrons: 7
-
what is the shape about the o atoms in the compound shown below? tetrah…
bent
-
question 2 (1 point) according to the common bonding patterns for atoms…
1
-
question 1 (1 point) which formula represents an organic compound? ch₃c…
$CH_3CO_2CH_2CH_3$
-
type the number of each subatomic particle into the blanks: protons pro…
Xe: Protons: 54, Neutrons: 77, Electrons: 54 Ar: Protons: 18, Neutrons: 22, Electrons: 18
-
5 elección múltiple 1 punto which phase of matter has particles that vi…
Solid ### Question 6
-
sort the items in the answer key into the correct location below: parti…
| Particle | Charge | Location | Mass | |--|--|--|--| | Proton | Positive | Nucleus | 1 amu | | Neutron | Neutral | Nucleus | 1 amu | | Electron | Negative | Electron Cloud | 0.00…
-
type in the blanks to identify the element shown in the atom diagram:
Protons: 6 Neutrons: 6 Electrons: 6 Element Name: Carbon Element Symbol: C
-
type in the blanks to identify the element shown in the atom diagram: p…
Protons: 6 Neutrons: 6 Electrons: 6 Element Name: Carbon Element Symbol: C
-
question 7 perform the following calculation and give the answer with t…
149.5 g
-
the density of liquid z is 0.9237 g/ml. a student masses a cup with a s…
37.7
-
based on the law of conservation of energy, which of the below is true?…
Energy cannot be created or destroyed by ordinary chemical or physical means.
-
3.12) what is replication in an experiment? a. doing something over aga…
3.12) A. doing something over again 3.13) B. a small part of something that represents something larger 3.14) A. type of grass, soil, water, location, pots
-
the density of liquid a is 1.0240 g/ml. a cup with a sample of liquid a…
32.56
-
what is repetition in an experiment? a doing something over again b cha…
1. A. doing something over again 2. B. a small part of something that represents something larger 3. A. type of grass, soil, water, location, pots 4. Publishing papers, presenting…
-
type the group and period where each element is found: cl chlorine → gr…
Cl: Group 17, Period 3 Ba: Group 2, Period 6 Ag: Group 11, Period 5
-
who uses the information provided by cytotechnologists? (1 point) chemi…
B. pathologists
-
the periodic table contains three types of elements: metals, nonmetals,…
From top to bottom: Metals, Metals, Nonmetals
-
how many significant figures are there in the measured quantity 0.670 m…
D. Three significant figures
-
multiple - choice question catalysts are substances that can only be us…
B. False
-
sort the groups into their correct location on the periodic table: answ…
From left - to - right (top - down in the question layout): Alkali Metals, Alkaline Earth Metals, Transition Metals, Halogens, Noble Gases
-
question perform the following calculation and give the answer with the…
0.077
-
sort the items in the answer key into the correct category below: drag …
Group 1: Alkali Metals Group 2: Alkaline Earth Metals Groups 3 - 12: Transition Metals Group 17: Halogens Group 18: Noble Gases Below the main groups: Lanthanides and Actinides
-
10 respuestas múltiples 1 punto which phase(s) of matter have particles…
10. Solid 11. The collisions of the particles with the walls of the container 12. 0.01
-
identify the correct elements being described below: part of the haloge…
First box: Hydrogen (H), Second box: Chlorine (Cl), Third box: Lithium (Li)
-
identify the correct elements being described below: the lightest noble…
The lightest noble gas: He, Transition Metal in Period 4: Cu, Alkaline Earth Metal with the greatest mass: Ra
-
type the symbol of each element that is described below: the lightest t…
Kr Br Fr Sc
-
question perform the following calculation and give the answer with the…
209
-
consider the following intermediate reactions. the overall chemical rea…
The overall enthalpy change for the reaction $CH_4(g)+2O_2(g) ightarrow CO_2(g)+2H_2O(l)$ is $- 890kJ$. This value is consistent with the given $\Delta H_3$ value in the problem -…
-
consider the following intermediate chemical equations. ch₄(g)→c(s)+2h₂…
$-205.7\ kJ$
-
question 7 when the management of whole foods made the commitment to st…
The option for a buy - out from a larger corporation, the chance to make more money and create a larger customer base, the ability to appeal to a very specific and curated custome…
-
consider the intermediate chemical reactions. ca(s)+co2(g)+1/2o2(g)→cac…
The enthalpy of the second intermediate equation is halved and has its sign changed.
-
section 2 review sc.912.p key ideas 1. explain why elements in a group …
1. Elements in a group have similar chemical properties because they have the same number of valence electrons which determine chemical behavior. 2. Oxygen and selenium both have …
-
consider the following intermediate chemical equations. 2na(s)+cl2(g)→2…
multiplying the first equation by (1/2) and the second equation by (1/4)
-
consider the following intermediate chemical equations. 2p(s) + 3cl₂(g)…
$PCl_3$
-
consider the following intermediate chemical equations. 2p(s)+3cl₂(g)→2…
\(PCl_3\)
-
question perform the following calculation and give the answer with the…
0.12
-
consider the following intermediate chemical equations. ch4(g)+2o2(g)→c…
$CH_4(g)+O_2(g) ightarrow CO_2(g)+2H_2(g)$ (assuming the correct combination based on cancelling out common - species between the two given equations)
-
if a chemical reaction is reversed, what happens to the enthalpy of the…
The sign of the enthalpy of the reaction reverses.
-
jason combines the two intermediate steps shown. n2(g) + o2(g)→2no(g) 2…
Cancel them out because there is one in each equation.
-
what are valence electrons? electrons found in the outermost energy lev…
For the atom with 7 valence electrons: Element Name: Chlorine; For the atom with 5 valence electrons: Element Name: Nitrogen
-
what is the final chemical equation from the following intermediate che…
$2P_4(s)+8O_2(g) ightarrow P_4O_6(s)+P_4O_{10}(s)$
-
what is the overall enthalpy change δhrxn for the system? δh₁ = 800 kj,…
$300\ kJ$
-
identify the number of valence electrons found in each element
Al: 3 C: 4 Ne: 8 K: 1 S: 6 Br: 7 P: 5 Ca: 2