Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
-
day 3 (10/7) 1. write the name for h₈p₆. 2. write the name for sncl₃. 3…
1. Hydrophosphoric acid 2. Tin(III) chloride 3. $GaBr_{3}$
-
periodic trends - ionization energy • ionization energy is the energy r…
# Explicación: ## Paso 1: Recordar la tendencia de la energía de ionización La energía de ionización aumenta hacia la derecha en un período y hacia arriba en un grupo en la tabla …
-
building an atom model activity - worksheet directions: read the backgr…
1. Cannot be determined without seeing the model. 2. Cannot be determined without seeing the model. 3. a. Cannot be determined without seeing the model. b. Cannot be determined wi…
-
6. calculate the molarity of a phosphoric acid (h₃po₄) solution that is…
$16.0\ M$
-
the rainwater that flows down a trees trunk, called stemflow, plays a v…
D. Future research is guided by an awareness of what is already well understood about stemflow and what has yet to be adequately addressed.
-
the main focus of sustainable agriculture is: increasing land usage eff…
maintaining long - term land productivity
-
ionic & covalent bonds: names & formulas ionic - write the name 1. alcl…
1. Aluminum chloride 2. Barium chloride 3. Calcium fluoride 4. Water 5. Carbon monoxide 6. Carbon tetrachloride 7. Nitrogen dioxide 8. Sulfur dioxide 9. Nitrogen trifluoride 10. S…
-
3. what do you notice about the negatively charged atom of one atom in …
They form a hydrogen bond due to the attraction between opposite partial charges.
-
5. the solubility of co₂ gas in water is 25°c and 1 atm is 0.034 mol/l.…
$1.02\times 10^{-5}\ mol/L$
-
4.26 write balanced net ionic equations for the reactions that occur in…
(a) Net - ionic equation: $2\mathrm{Cr}^{3 +}(aq)+3\mathrm{CO}_{3}^{2 -}(aq)\to\mathrm{Cr}_{2}(\mathrm{CO}_{3})_{3}(s)$; Spectator ions: $\mathrm{NH}_{4}^{+}$, $\mathrm{SO}_{4}^{2…
-
question 1 (1 point) the periodic table organizes elements in alphabeti…
False
-
your body on fear it all starts in your brain. 1) boom! instantly, your…
Scary movies and TV shows make millions of dollars every year because fear can be fun in safe - situations. Chemicals released during the fight - or - flight response can create a…
-
20) the density of water is 0.997 g/ml. if you have 375 ml of water, ho…
$373.875$
-
the density of water is 0.997 g/ml. if you have 375 ml of water, how ma…
$373.875$
-
25/25 all polymers (large molecules) are made up of... proteins monosac…
C. monomers
-
what is a substance called if it speeds up a chemical reaction? catalys…
A. catalyst
-
water is a universal solvent because it... it can be found anywhere it …
D. Dissolves most substances
-
wednesday, 1st week of october photosynthesis filtration filtration ele…
Electrolysis
-
4.1: solution concentration/water as a solvent a chemist dilutes 60.0 m…
$216\ mL$
-
4.1: solution concentration/water as a solvent isotonic saline is a 0.1…
Take $0.02\ L$ of the $6.0\ M$ stock solution and add $0.78\ L$ of water.
-
a brainwave pattern is caused by the chemical signals sent between the …
F
-
109. consider three identical flasks filled with different gases. flask…
a. The average kinetic energy is the same in all flasks (A, B, and C) since the temperature is the same in all of them. b. Flask C ($H_2$) will have the molecules with the greates…
-
108. consider two gases, a and b, each in a 1.0 - l container with both…
a. Gas B has the most molecules present because, at the same temperature, pressure and volume, the number of moles is proportional to the mass, and gas B has a greater mass. b. Bo…
-
the particular distribution of an electrons among various shells, sub -…
FALSE
-
which electron configuration is that of an element in the fourth period…
C. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{1}$
-
107. consider a 1.0 - l container of neon gas at stp. will the average …
a. Average kinetic energy: increases; Average velocity: increases; Frequency of collisions: increases b. Average kinetic energy: decreases; Average velocity: decreases; Frequency …
-
in an electron configuration code, superscripts placed on sub - levels …
B. Electrons
-
what do all of the elements in a given horizontal row of the periodic t…
d. They have the same number of occupied principal energy levels.
-
what is the chemical symbol for the element that has the electron confi…
Al
-
what is the electron configuration of the element in period 2 that has …
B. $1s^{2}2s^{2}2p^{4}$
-
use the following electron configuration of europium 1s²2s²2p⁶3s²3p⁶3d¹…
d. 13
-
using the periodic table, which of the following is the correct electro…
B. \([Ar]4s^{2}3d^{3}\)
-
what do the superscripts in an electron configuration represent? a subl…
B. electrons
-
how many electrons are in an atom with the electron configuration of 1s…
C. 11
-
an atom has the electron configuration of 1s²2s²2p⁵. how many electrons…
B. Nine
-
which of the following is the correct orbital diagram for oxygen?
a
-
which diagram describes how electrons fill the 3p orbital for sulfur?
D.
-
the atomic number of an element whose outermost electrons are represent…
b. FALSE
-
1s 2s 2p is the above figure is correct? a yes b no
b. No
-
which of the following sublevels has the highest energy? a 4s b 3p c 3s…
d. 3d
-
the short form electron configuration of ruthenium is kr4d^{7}5s^{1}, a…
b. $\uparrow,\uparrow\downarrow,\uparrow,\uparrow,\uparrow,\uparrow$
-
92. alkanes are a class of molecules that have the general formula cₙh₂…
a. $C_2$: approximately $-102.0^{\circ}C$, $C_4$: approximately $-3.0^{\circ}C$, $C_6$: approximately $67.0^{\circ}C$, $C_8$: approximately $124.5^{\circ}C$ b. 4 c. 2 d. Approxima…
-
11. write the simple lewis - dot structure for each of the following at…
11 - a. Mg with 2 dots around it 11 - b. Br with 7 dots around it 11 - c. S with 6 dots around it 11 - d. Si with 4 dots around it 12 - a. S in the center with 2 single bonds to H…
-
10. write the simple lewis - dot structure for each of the following at…
a. I: I with 7 dots around it b. Al: Al with 3 dots around it c. Xe: Xe with 8 dots around it d. Sr: Sr with 2 dots around it
-
10. write the simple lewis - dot structure for each of the following at…
a. I: Lewis - dot structure with 7 dots around I; \(H_2S\): \(H - S - H\) with 2 non - bonding pairs on S, tetrahedral electron - pair geometry and bent molecular geometry; \(CBr_…
-
*89. a flask that can hold 158 g of water at 4°c can hold only 127 g of…
$0.804\ g/cm^{3}$
-
105. you have a gas in a container fitted with a piston and you change …
1. Decrease the temperature: At constant pressure and amount of gas, volume is proportional to temperature according to Charles's law ($V\propto T$). 2. Increase the external pres…
-
82. which would melt first, germanium with a melting point of 1210 k or…
Germanium would melt first.
-
use the diagrams below to answer questions 8 and 9. the atomic windows …
8. b > c > a 9. The density of the gas in window (b) is $\frac{9}{5}$ times the density of the gas in window (a).
-
for questions 6 - 7, identify the known and the unknown. include units …
$5\ dL$ ### Question 7
-
3. it provides a neurochemical rush. \i think, oh my god, what will hap…
B. It explains how the brain responds to reading suspense.
-
practice it! in 1869, the russian chemist dmitri mendeleev developed a …
This example is science. It meets all six of the criteria in CONPTT, including being tentative. New evidence was found that changed the scientific understanding.
-
practice it! select the statement(s) that are true about physical scien…
Physicists study how energy interacts with matter. Chemists use structural formulas and ball - and - stick models of molecules to help them visualize and predict what substances w…
-
in a chemical reaction, substance a transfers electrons to substance b.…
Substance B is reduced and acts as the oxidizing agent
-
which component is transferred between substances in an oxygen - reduct…
electrons
-
in the decomposition of water, why is twice as much hydrogen as oxygen …
There are two atoms of hydrogen and one atom of oxygen in a water molecule.
-
in a synthesis reaction, two atoms of sodium (na) combine with one mole…
C. two
-
which statement correctly describes the classification of chemical reac…
Not all reactions fit into one category, and some reactions can fit into more than one category.
-
6. find the element phosphorus, p, on the periodic table. a. what is th…
a. 30.973762 u b. 15 c. $^{31}P$
-
all of the following are correct, except: matter and energy are the bui…
Physical science is the study of living things.
-
review it select the statement(s) that are true about physical science.…
The true statements are: Physics is the study of how energy interacts with matter; Chemistry is the study of matter, what it is made of, and how it changes; Particle physicists us…
-
what does the literary term \tone\ mean? it refers to how long the sent…
It refers to the author's attitude toward his subject matter.
-
identifying sound devices hear the loud alarm - bells, brazen bells! wh…
What sound device is used in the line "What a tale of terror, now, their turbulence tells"? alliteration "Shriek" is an example of what sound device? onomatopoeia What is the rhym…
-
identifying sound devices. use the drop - down menus to answer the ques…
alliteration
-
3 multiple answer 1 point which phase(s) of matter has variable shape? …
## Question 3: A. Liquid, C. Gas ## Question 4: B. colloid ## Question 5: B. Gas, C. Liquid
-
9 multiple choice 1 point which of these is an element? shaving cream m…
C. iron ### Question 10
-
how do you convert 0.4 ml to l? move the decimal 2 places to the left. …
1. B. Move the decimal 3 places to the left. 2. B. $CH_4$ 3. A. carbon dioxide
-
19 multiple choice 1 point which of these is a mixture with matter than…
19. B. Homogeneous mixture 20. A. oil and water
-
1. in general terms, what is a chemical bond? 2. the energy required to…
1. The force holding atoms together, from electron sharing or transfer. 2. Bond - energy 3. Metals and non - metals 4. Sharing of electron pairs between atoms 5. \(H_2\): non - po…
-
which list includes only physical properties? o density, reactivity, an…
boiling point, conductivity, and color
-
which is an example of a chemical change? water evaporating from a pudd…
bread baking in an oven
-
which of these is an example of a physical change? sugar dissolving in …
sugar dissolving in warm water
-
a student performs the following experiment. step 1: she pours a colorl…
A. a chemical change in step 1 and a physical change in step 2
-
the table below shows the freezing points of four substances. substance…
benzene
-
which of these is an extensive property of a substance? color hardness …
volume
-
which of these is an extensive property of a substance? color hardness …
volume
-
which of these is an extensive property of a substance? color hardness …
volume
-
which term refers to a property that depends only on the amount of a su…
B. extensive
-
in which phase transition do molecules move directly from a state invol…
B. sublimation
-
a solid substance turns directly into a gas. which term describes this …
sublimation
-
match the correct term with the correct vocab word period group family …
Period: The 7 rows that run left to right on the periodic table Group: The 18 columns that run top to bottom on the periodic table Family: A type of group on the periodic table wh…
-
magnesium (mg) is in group 2 and period 3. how many energy levels (shel…
3 energy levels, 2 valence electrons (corresponds to the third option in the multiple - choice list)
-
h₂o is initially present in a state where its molecules are far apart. …
A. from a gas to a liquid
-
which family of elements is the least reactive? noble gasses halogens t…
Noble gasses
-
what do all alkali metals (group 1) have in common? they are gases at r…
One valence electron
-
jean has a sample of a liquid. if she changes the liquids phase by allo…
evaporating
-
elements in the same group of the periodic table have the same: o numbe…
Number of valence electrons
-
2 which subatomic particle defines an element? a mass number b electron…
D. proton
-
1. which best explains why the periodic table lists one atomic mass for…
B. It is a weighted average of all isotopes
-
jean has a sample of a liquid. if she changes the liquids phase by allo…
evaporating
-
16 formula 1 punto convert 267.4 kpa to atm. (1 atm = 101 kpa) round to…
$2.6$ ### 17
-
question 9 after 13 weeks, tran finally noticed the pink clock in the c…
Selective attention
-
example 8: pollution and fish populations in a lake, fish population wa…
Claim A is best supported by the data. Claim B is not supported because the fish population decreased from 500 to 200 after the chemical spill, which shows that pollution had an e…
-
8 formula 1 punto calculate the temperature, in k, when 41.8 l at 276.5…
18.5 For question 9:
-
6 elección múltiple 1 punto which of these is a compound? carbon dioxid…
6. carbon dioxide 7. The first particle diagram (with blue - white bonded pairs)
-
3 elección múltiple 1 punto which of these is a mixture with matter tha…
3. Heterogeneous mixture 4. elements
-
15 elección múltiple 1 punto what happens at the particle level when pr…
15. The particles have more frequent or forceful collisions. 16. Solid 17. iron
-
18. fórmula 1 punto a gas has a pressure of 710.9 mm hg at 12.3 °c. wha…
$-11.5$ °C ### 19.
-
what is the correct measurement? (refer to the graduated cylinder diagr…
# Explicación: ## Paso 1: Observar la menisco La menisco del líquido en el cilindro graduado se encuentra entre 36 y 37 mL y está más cerca de 36.5 mL. # Respuesta: 36.5 mL
-
the antibody molecule consists of how many polypeptide chains, includin…
- Question 11: D. 4 - Question 12: B. False - Question 13: Second, third and fourth options (are in lymph from the head and neck, are in lymph from the arms and legs, enter the bo…