化學
化學反應、化學計量、分子結構與元素性質。
-
oxygen is acting as an oxidizing agent in all of the following reaction…
C. $2\ \text{F}_2(\text{g}) + \text{O}_2(\text{g}) ightarrow 2\ \text{OF}_2(\text{g})$
-
fill in the name and empirical formula of each ionic compound that coul…
| cation | anion | empirical formula | name of compound | |--------|-------|-------------------|------------------| | $\text{K}^+$ | $\text{O}^{2-}$ | $\text{K}_2\text{O}$ | Potas…
-
write the electron configuration of an atom of the element highlighted …
$1s^2 2s^2$
-
we wear the mask that grins and lies,it hides our cheeks and shades our…
D. by discussing individual identity
-
an analytical chemist measures the amount of elements $e_1$ and $e_2$ i…
Is X a pure substance or a mixture? pure substance Mass of Element $E_1$ in 10.0 g sample: 2.6 g
-
2) given 5.86 grams of nan₃, how many grams of na are produced?
2.07 grams
-
question 6 an increasingly influential view of cognitive development pr…
Question 6: culture and socioculture theory. Question 7: with support.
-
15. $\frac{3.01 \times 10^{23}}{6.02 \times 10^{23}}$ atoms ni = 0.500 …
16. $1.66 \times 10^{-21} \text{ mol Al}$ 17. $1.81 \times 10^{24} \text{ atoms Ar}$ 18. $5.12 \times 10^{24} \text{ atoms Fe}$ 19. $1.51 \times 10^{25} \text{ atoms Ar}$ 20. $6.0…
-
name santiago escobar period 3b intro to stoichiometry - grams to grams…
0.59 gramos de $\text{NaN}_3$
-
name santiago escobar periodintro to stoichiometry - grams to grams pra…
1) 0.59 grams of $\text{NaN}_3$ 2) 2.07 grams of $\text{Na}$ 3) 67.1 grams of $\text{Fe}$
-
question 11 of 25 which two words, if added to the blanks, would give t…
D. (1) said; (2) Sue
-
question 9 of 28 which poetic form is made up of 14 lines, was made fam…
B. English sonnet
-
what a gas lab exit ticket if the temperature of a gas increases, the g…
○ False
-
read & annotate the word choice in the following description: \he felt …
From this description, we can infer that Mildred has engaged in extreme, harmful self-modification (chemical hair treatments, severe dieting) to conform to narrow beauty standards…
-
coaching time 1. can you do it? $\boldsymbol{2}$ h$_2$ + $\boldsymbol{1…
2. $6\text{CO}_2 + 6\text{H}_2\text{O} ightarrow \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2$ 3. The product is incorrect; the correct balanced reaction is $2\text{H}_2 + \tex…
-
11 formula 1 point what would be the volume (l) of 5.0 moles of a gas a…
1. 112.00 L 2. 0.94 moles
-
multiple choice 1 point compound freezing point (°c) $k_f$ in k·kg/mol …
Camphor
-
10 multiple answer 1 point ionic compounds are strong ______ that _____…
electrolytes, dissociate
-
all of the following be great at lowering vapor pressure except a subst…
1. slightly soluble 2. False
-
7 multiple answer 1 point a ______ is a property of a solution that dep…
colligative property, number, identity
-
6 multiple choice 1 point water is the solvent in the beakers. which te…
105
-
5 true or false 1 point nonvolatile solutes readily escape into the vap…
False
-
4 multiple choice 1 point a solution that has the maximum amount of sol…
A. saturated
-
the vapor pressure of water depends on the number of particles dissolve…
True
-
2 multiple choice 1 point when a liquid evaporates readily, it has ○ fe…
a high vapor pressure
-
solve the following problems according to the directions. show all work…
### Convert to moles 6. $0.500\ \text{mol Sn}$ 7. $128\ \text{mol K}$ 8. $2.48 \times 10^{-4}\ \text{mol Ne}$ ### Convert to mass in grams 9. $230.\ \text{g Na}$ 10. $261\ \text{g…
-
1 multiple choice 1 point one of the following is not a colligative pro…
solubility
-
formic acid (hcooh) is found in the venom of some ants and bees. it dec…
| | Number of atoms in reactants | Number of atoms in products | |--|--|--| | H | 2 | 2 | | C | 1 | 1 | | O | 2 | 2 |
-
what element does the symbol o stand for? what is the symbol for iron? …
1. Oxygen 2. Fe 3. 8 4. 7 5. 18 6. Approximately 15 (or 14.98)
-
name anijahblock1. name the following ionic compounds using their chemi…
### For Question 1: - $\text{Ag}_2\text{S}$: Silver Sulfide (correct as written) - $\text{CoCl}_3$: Cobalt(III) chloride ### For Question 2: - Scandium oxide: $\text{Sc}_2\text{O}…
-
methane gas ($ch_4$) is used as a fuel for gas stoves. when methane gas…
The top-left model (1 methane molecule + 2 oxygen molecules → 1 carbon dioxide molecule + 2 water molecules)
-
nitrosyl chloride (nocl) is used to bleach flour. it can be produced by…
| | Number of atoms in reactants | Number of atoms in products | |---|---|---| | N | 2 | 2 | | O | 2 | 2 | | Cl | 2 | 2 |
-
hydrogen chloride (hcl) dissolved in water can be used to remove rust a…
The third model (from left to right, the box with 1 $\ce{H_{2}}$ molecule, 1 $\ce{Cl_{2}}$ molecule, and 2 $\ce{HCl}$ molecules as products) accurately represents this reaction.
-
hydrogen peroxide ($h_2o_2$) can be used to disinfect and clean surface…
The second model (from left: two $\text{H}_2\text{O}_2$ molecules reacting to produce one $\text{O}_2$ molecule and two $\text{H}_2\text{O}$ molecules)
-
ethene ($c_2h_4$) is used in welding and metal cutting. ethene burns in…
| | Number of atoms in reactants | Number of atoms in products | |--|--|--| | H | 4 | 4 | | C | 2 | 2 | | O | 6 | 6 |
-
acetamide ($\text{ch}_3\text{conh}_2$) is used in the leather-making pr…
| | H | C | N | O | |--|--|--|--|--| | Number of atoms in reactants | 7 | 2 | 1 | 2 | | Number of atoms in products | 7 | 2 | 1 | 2 |
-
urea ($ch_4n_2o$) is commonly used in fertilizers. urea and water ($h_2…
| | Number of atoms in reactants | Number of atoms in products | |--|--|--| | H | 6 | 6 | | C | 1 | 1 | | N | 2 | 2 |
-
why are the trends and exceptions to the trends in ionization energy ob…
- Ionization energy tends to increase across a period because the nuclear charge increases. - Ionization energy tends to increase across a period because electrons are added to th…
-
acetaldehyde ($c_2h_4o$) is used as a food additive to give foods a gre…
| Atom | Number of atoms in reactants | Number of atoms in products | |------|-------------------------------|------------------------------| | H | 8 | 8 | | C | 4 | 4 | | O | 2 |…
-
acetic acid ($ch_3cooh$), the primary component of vinegar, has a varie…
| | Number of atoms in reactants | Number of atoms in products | |--|--|--| | H | 10 | 10 | | C | 4 | 4 | | O | 3 | 3 |
-
1,2-dibromoethane ($c_2h_4br_2$) is applied to logs to prevent termite …
| | Number of atoms in reactants | Number of atoms in products | |---|---|---| | H | 4 | 4 | | C | 2 | 2 | | Br | 2 | 2 |
-
according to the graph below, what is the density of the object? 0.20 g…
5.00 g/cm³
-
1) gasoline-powered cars produce the pollutant nitrogen monoxide (no). …
| | Number of atoms in reactants | Number of atoms in products | |--|--|--| | N | 1 | 1 | | O | 4 | 4 |
-
possible points: 2 match the term with the statement-some may be used m…
1. Measure of force that a substance can withstand without breaking → Tensile Strength 2. Glass is an example of this property → Brittleness 3. Diamonds are an example of a substa…
-
possible points: 2 if you were to heat a liquid, what would happen to i…
1. Viscosity decreases 2. The particles would move around more and move further apart, creating less friction when the material is transferred to another container.
-
in the atmosphere, nitric oxide (no) forms when a lightning strike caus…
| | Number of atoms in reactants | Number of atoms in products | |--|--|--| | N | 2 | 2 | | O | 2 | 2 |
-
when compared to a high viscosity liquid, a liquid with a low viscosity…
D. is easier to pour
-
possible points: 1 as a substance changes state from a solid, to a liqu…
Yes. It changes due to the fact that as a substance goes from a solid to liquid to gas, the molecules move further and further apart
-
4) hydrogen peroxide (h₂o₂) can be used to lighten or bleach hair. it i…
| | Number of atoms in reactants | Number of atoms in products | |--|--|--| | H | 2 | 2 | | O | 2 | 2 |
-
ice cubes float in a glass of water because: the ice is losing mass thr…
The molecules of ice are arranged in such a way to leave empty space.
-
liquid steel is less dense than solid steel because ________.○ the mole…
the molecules in a liquid are not as tightly packed
-
use the periodic table to answer the following questions. what is the p…
1. Be > Mg > Ca > Sr 2. P > S > Si > Al
-
use the periodic table to answer the following questions. what is the p…
Be > Mg > Ca > Sr
-
14. students in a science class at crestdale middle school bring in tap…
Sample 1
-
practice: solubility curve answer the following questions about the sol…
1. Most soluble at 0°C: Substance C; Most soluble at 100°C: Substance A 2. 60 grams in 100 g water; 240 grams in 400 g water 3. Substance C 4. Solubility of Substance A and Substa…
-
exercice 2 (4pts) 1. une solution de chlorure de daluminium $(al^{3+} +…
1) Le nombre d'ions d'aluminium est $8,10^{22}$ 2) Le nombre de charges positives portées par les ions aluminium est $24,10^{22}$, et le nombre de charges négatives portées par le…
-
questions for passage 2 answer all questions based on the passage above…
1. c. The oldest layers are at the bottom. 2. b. Principle of Original Horizontality 3. a. A stack of books 4. b. To place fossils in a chronological context 5. c. It can mislead …
-
diagram shows the formation of a dead zone in the ocean. is the source …
A. cities E. farms
-
question 16 this allows a metal to be pounded into a flat shape. ○ brit…
C. Malleable
-
drag each tile to the correct location. based on its chemical propertie…
- Left empty box (Group 1, below H): alkali metals - Top-left empty box (Group 2): alkaline earth metals - Central empty box (Groups 3-12): transition metals - Top-right empty box…
-
select the correct answer.nitrogen is a group 15 element. what does bei…
C. Nitrogen has 5 valence electrons.
-
drag each tile to the correct box. match each set of energy sublevels t…
third energy level → s, p, and d sublevels first energy level → s sublevel second energy level → s and p sublevels
-
2 select the correct answer from each drop-down menu. to make a table o…
First dropdown: atomic weights Second dropdown: properties
-
periodic table of the elements i am in group 14 and period 3. i am a me…
Si
-
24. how many moles are in $3.01 \\times 10^{23}$ particles of aluminum …
24. B. 0.50 mol 25. C. 1.50 mol
-
20. how many molecules are in 0.25 moles of co₂? a. $6.02 \\times 10^{2…
20. B. $1.51 \times 10^{23}$ 21. B. 1.00 mol 22. D. 112 L 23. D. $\text{CaCO}_3$
-
17. how many grams are in 0.50 moles of sodium hydroxide (naoh)? a. 20 …
A. 20 g --- ### Question 18
-
of the elements i am in group 1 and period 2. i am the lightest metal o…
Li
-
12. how many liters does 1.00 mole of any gas occupy at stp? a. 11.2 l …
12. B. 22.4 L 13. C. 56.0 L 14. B. 2.00 mol 15. A. 16.8 L 16. B. 0.50 mol
-
7. how many atoms are in 3.00 moles of helium (he)?a. $6.02 \\times 10^…
7. B. $1.81 \times 10^{24}$ 8. B. 2.00 mol 9. B. 0.10 mol 10. B. 100 g/mol 11. B. 0.50 mol
-
4. how many grams are in 2.5 moles of oxygen gas ($o_2$)? a. 40 g b. 80…
4. B. 80 g 5. B. 1.00 mol 6. B. $1.20 \times 10^{24}$
-
periodic table of the elements this is an element found in period 6 and…
D. bismuth
-
question 10 how many neutrons does $^{40}$ca contain? periodictable.pdf…
a. 20
-
question 9 the element with the symbol zn is zinc. periodictable.pdf tr…
True
-
how many electrons does a neutral $^{40}$ca atom contain? periodictable…
a. 20
-
2025/2026 - west bloomfiel... home modules assignments grades 14 people…
○ arsenic
-
use the periodic table to answer the following question: what are the p…
- Ionic radii tend to increase down a group. - Cationic radii tend to decrease across a period. - Ionic radii increase when switching from cations to anions in a period.
-
the mass number of an atom is determined by the sum of protons and neut…
True
-
question 6 the periodic table is arranged based on increasing atomic nu…
True
-
1. what determines how an element reacts? 2. why do atoms form bonds? 3…
1. The number and arrangement of valence electrons (outer-shell electrons) of the element determine how it reacts. 2. Atoms form bonds to achieve a more stable electron configurat…
-
question 5 which of the following is the correct symbol for copper? per…
c. Cu
-
periodic table of the elements this is an element with an atomic weight…
silver
-
periodic table of the elements this element has an atomic weight of 50.…
vanadium
-
which of the following is the correct symbol for zinc? periodictable.pd…
d. Zn
-
question 3 which of the following is the correct symbol for krypton? pe…
b. Kr
-
select all the correct images. select the two atomic models that belong…
The top-right atomic model and the bottom-left atomic model
-
how many protons does $^{40}$ca contain? periodictable.pdf ○ a. 40 ○ b.…
d. 20
-
5. $2c_{2}h_{6} + 7o_{2} \ ightarrow 4co_{2} + 6h_{2}o$ a. how many gra…
234.72 grams of carbon dioxide are produced.
-
description instructions multiple attempts not allowed. this test can o…
d. 20
-
which of the following is the correct symbol for iodine? periodictable.…
c. I
-
question 3 1.5 pts an element has an atomic number 10 and mass number 2…
Protons: 10, Neutrons: 14, Electrons: 10
-
which symbolizes a molecule of a compound? hint: more than one element …
B. NaCl
-
use the periodic table to compare the sizes of ionic radii with the cor…
1. A sodium cation is smaller than a sodium atom. 2. A phosphorus anion is larger than a phosphorus atom. 3. A magnesium ion is smaller than a sodium ion. 4. A chlorine ion is sma…
-
name__________ class__________ date__________ what is an oxidation numb…
1. True 2. False; negative 3. False; 0 4. True 5. False; electrons 6. False; formulas 7. False; NaCl 8. True 9. False; 8 10. True --- ### Skill Challenge
-
the great depression and the new deal exam american history academic (p…
It would have expanded the Court by allowing the president to appoint new justices when existing justices turned 70.
-
describe the trends in atomic radii by checking the correct box. atomic…
Atomic radii from the left to right across a period tend to: ☑ decrease. Atomic radii from the top to the bottom of a group tend to: ☑ increase.
-
use the periodic table to determine which elements are likely to have a…
aluminum (Al) tin (Sn)
-
how many stereogenic carbons are in the following molecule? 0 1 2 3 4
2
-
question 3 5 pts what is the maximum number of configurational isomers …
four
-
Question was provided via image upload.
7) $4\text{P} + 5\text{O}_2 ightarrow 2\text{P}_2\text{O}_5$; Reaction Type: Synthesis (Combination) 8) $2\text{Al} + 6\text{HCl} ightarrow 2\text{AlCl}_3 + 3\text{H}_2$; Reaction…