化学
化学反応、化学量論、分子構造、元素の性質。
-
9. how do you determine the number of valence electrons that an element…
s (summarized): 9. Use the element’s group number (main - group: group # = valence e⁻; transition metals: variable). 10. At the top of each vertical column (group). 11. Organized …
-
6 infer the atomic number of barium is 56. what do you know about the s…
- A neutral barium atom has 56 protons in its nucleus. - A neutral barium atom has 56 electrons orbiting the nucleus. - For the most abundant isotope (barium-138), the number of n…
-
5 summarize what are the three main classes of elements? provide two ph…
The three main classes of elements, with two physical properties each, are: 1. Metals: High electrical conductivity; malleable (can be shaped without breaking) 2. Nonmetals: Poor …
-
directions: read periodic table trends: what are groups and periods? th…
To answer these periodic table trend questions, we analyze each one based on chemistry concepts: ### 1. Properties of elements in a pattern Elements show patterns in **atomic radi…
-
4 relate explain how the terms atom and element are related.
An element is a pure substance composed entirely of identical atoms, where each atom of the element has the same number of protons in its nucleus. Atoms are the basic building blo…
-
vocabulary draw a line to connect the following terms to their definiti…
1. nucleus - C. the central region of an atom 2. element - A. a pure substance made up of one type of atom 3. chemical symbol - B. letters that represent an element
-
lewis structure worksheet #1 summarize the instructions for drawing lew…
To solve Lewis structures, we follow these steps for a molecule (e.g., \( \text{CH}_4 \)): ### Step 1: Count Valence Electrons Carbon (C) has 4 valence electrons, and each Hydroge…
-
concept: calculating density what is the density of a plastic ball that…
The density of the plastic ball is \(2\,\text{g/cm}^3\). ### Part 2: Density as a Physical or Chemical Property
-
a solution has certain characteristics: - it is ______ or homogeneous, …
### Characteristics of a Solution: - It is $\boldsymbol{\text{uniform}}$, or homogeneous, throughout the mixture - It is $\boldsymbol{\text{does not separate}}$ over time or settl…
-
part 4: suspensions and colloids use this website to answer these quest…
To answer these questions, we can refer to the provided website (http://www.ducksters.com/science/chemistry/chemical_mixtures.php) and recall basic concepts about suspensions and …
-
ben is giving a speech in his chemistry class in which he describes a r…
technical language
-
$2h_2 + o_2 \ ightarrow 2h_2o$ given 50.0 grams of $h_2$, how many mole…
24.8 mol $\text{H}_2\text{O}$ (For the box matching: 1. Leftmost box: $\boldsymbol{50.0\ \text{g}\ \text{H}_2}$ 2. Middle left box: $\boldsymbol{2.016}$ 3. Middle right box upper:…
-
what is the mole ratio of $\text{ca(oh)}_2$ to $\text{caso}_4$ in the f…
$1:1$
-
the actual yield is 49.25 grams. the theoretical yield is 53.67 grams. …
91.76%
-
how many grams of h₂ will be required if 6.23 grams of nh₃ is produced …
Filled t-chart values (left to right, top then bottom): Top row: 1, 3, 2.016 Bottom row: 17.031, 2, 1 Final calculated mass of $\text{H}_2$: $1.11\ \text{g}$ (The completed dimens…
-
the change in height of a solution in a beaker during a chemical reacti…
$-0.0382$ millimeters
-
mole ratio mole conversion given amount moles of unknown moles of known…
1. Top left blank: given amount 2. Top middle blank: moles of Known 3. Bottom middle blank: moles of Unknown 4. Top right blank: 1 mole of Unknown 5. Bottom right blank: Molar Mas…
-
which of the following descriptions is accurate? a. a ballad consists o…
A. A ballad consists of three or four stressed syllables per line and a story of some kind.
-
read the following excerpt from a poem: and thou art dead, as young and…
C. abba
-
do now name: madison c date: feb 9 class: chem p.4 balance & identify t…
1. Balanced equation: $\boldsymbol{\text{Ca} + \text{Cl}_2 ightarrow \text{CaCl}_2}$ Reaction type: $\boldsymbol{\text{Combination}}$ 2. Balanced equation: $\boldsymbol{2\text{KCl…
-
mole conversion mole ratio molar mass (g) moles of unknown moles of kno…
| Position | Filled Component | |-------------------|--------------------------------| | Top Left | given amount | | Bottom Middle | Molar Mass (g) | | Top Middle | moles of Known…
-
which statement accurately describes what happens when water turns to i…
The water releases energy which causes the water molecules to have less kinetic and potential energy, changing their configuration from liquid to solid.
-
which statement accurately describes what happens when water turns to s…
The water absorbs energy which causes the water molecules to have more kinetic and potential energy, changing their configuration from a liquid to a gas.
-
review: unit 7 - stoichiometryvocabularythe ____________ represent the …
1. The **coefficients** represent the number of **moles** needed to complete a chemical reaction. 2. We need a balanced chemical equation to complete stoichiometric calculations i…
-
21. the temporal area affects: * 3 points a. bang placement only b. hai…
21. C. Balance and blending 22. C. Occipital 23. C. Cutting accuracy 24. B. Top and sides of the head
-
13. the occipital area is: *3 pointsa. the front of the headb. the back…
13. B. The back of the head 14. B. At the hairline near the neck 15. C. It affects the perimeter and finish 16. B. Guide sectioning and cutting
-
re-order each list in the table below, if necessary, so that the atoms …
1. Be, B, O 2. I⁻, I, Br 3. I⁻, Xe, I
-
the plateaus of the graph represent changes in the substances (check al…
☑️ state of matter ☑️ potential energy
-
name:per:35a: classifying changes skills check1. a student lights a can…
1. C. Both physical and chemical changes have occurred. 2. The solid wax melting into liquid wax is a physical change (only state of matter changes, no new substance formed). The …
-
re-order each list in the table below, if necessary, so that the atoms …
| atoms or ions | atoms or ions in order of decreasing size | |---------------|-------------------------------------------| | $\text{Be}^+, \text{Be}, \text{Li}$ | $\text{Li}, \te…
-
the amount of heat needed to boil a liquid at its boiling point is call…
Heat of Vaporization
-
a neutral atom has the following electron configuration: $\\ce{ne 3s^1}…
1. Chemical symbol: Na 2. Total electrons: 11 3. 3s electrons: 1
-
an atomic cation with a charge of +1 has the following electron configu…
1. $\text{Na}^+$ 2. 10 3. 6
-
an atomic anion with a charge of $-1$ has the following electron config…
1. $\text{I}^-$ 2. 54 3. 10
-
what type of bond or attraction is broken when heat is added to the liq…
the hydrogen bond between different water molecules
-
across 6. the ability of a substance to burn or ignite. 8. the ability …
6. FLAMMABILITY 8. MAGNETISM 9. COMBUSTION 11. CONDUCTIVITY 14. MELTING POINT 16. LUSTER 18. COLOR 19. DUCTILITY 23. CHEMICAL REACTIVITY 24. ODOR 25. PH 26. OXIDATION 27. PHYSICAL…
-
across 4. the ability of a substance to burn or ignite 8. the ability o…
## Across: 4. **LUSTER** (ability to bend light) 8. **MAGNETISM** (attract/repel other materials) 9. **COMBUSTION** (rapid reaction with oxygen for heat/light) 15. **CONDUCTIVITY*…
-
why is a protective apron or lab coat important to use when working wit…
Acids break down fabrics and can cause burns if the acids are strong.
-
which substance is used to remove rust from metal? ○ lye (naoh) ○ hydro…
hydrochloric acid (HCl)
-
while researching life during colonial times, carson learns that people…
making soap
-
when an old building is to be torn down, mr. phams company removes the …
hydrochloric acid
-
mrs. rushing fills a balloon with hydrogen gas to demonstrate its abili…
Mg and HCl
-
who would most likely be required to work with sodium hydroxide? ○ a pl…
a plumber
-
which substance is an acid?○ lioh○ mg(oh)₂○ ch₃cooh○ nacl
CH₃COOH
-
a compound that releases hydroxide ions in solution would most likely h…
A. It would react with lipids to form soap.
-
which substance is used in fertilizers? slaked lime ($\\text{ca(oh}_2\\…
nitric acid ($\text{HNO}_3$)
-
choosing the right substance ren runs a hamburger stand and needs to cl…
Ren should look for a cleaning product with the following key properties: 1. A heavy-duty, grease-specific formula with active degreasers (such as surfactants or mild solvents) th…
-
which characteristic describes bases?○ taste sour○ feel slippery○ react…
B. feel slippery
-
which of the following are properties of both acids and bases? check al…
- conduct electricity - cause burns
-
identify some acids that are found in everyday materials. □ lemon juice…
- lemon juice - vinegar
-
identifying bases which substances are bases? check all that apply. nao…
- NaOH - KOH - $Ca(OH)_2$
-
which substances are acids? check all that apply. agoh hf niooh nh₄oh h…
B. HF E. HMnO₄
-
$\\frac{2,860\\text{ kilograms}}{0.915\\text{ cubic meters}} \\cdot \\f…
$\boldsymbol{3}$ (Option 3)
-
match each person or term to the correct description. john b. goodenoug…
- John B. Goodenough: Scientist who later won a Nobel in Chemistry - Lithium-ion batteries: Rechargeable power sources for mobile devices - Esther Duflo: Economist using experimen…
-
which bonds are found inside a water molecule, between hydrogen and oxy…
covalent bonds
-
which statement best explains why water is known as the universal solve…
Water has the ability to dissolve more substances than any other liquid.
-
which statement explains why hydrogen bonds are able to form between wa…
A. Water molecules are polar.
-
8. what sector of the u.s. economy consumes most of the nations petrole…
8. Transportation 9. Electrons
-
2. electrical energy can be produced from mechanical energy chemical en…
2. D. All of the above 3. C. Heating and cooling rooms
-
at what temperature will water heat to the point of vaporization? (chec…
B. 100 Celsius D. 373 Kelvin
-
9) 78g pb(oh)₄10) 15.1g hno₃calculate the mass for the following-11) 2.…
11) $126.234\ \text{g}$ 12) $374.5525\ \text{g}$ 13) $308.67\ \text{g}$ 14) $1183.4976\ \text{g}$ 15) $47.2635\ \text{g}$
-
multiple-choice question a change in enthalpy is a change in heat chang…
change in heat
-
multiple-choice question why is it hard to see a gas? molecules are clo…
Moleuces are further apart (note: this contains a typo, it should be "Molecules are further apart")
-
multiple-choice question what is going to happen to the water molecules…
they will begin to move past each other
-
multiple-choice question a measure of the average kinetic energy of the…
temperature
-
true or false: oxgen has slightly negative charge compared to hydrogen.…
True
-
multiple-choice question where do the electrons in the water molecule s…
closer to the oxygen atom
-
9 le graphique ci-contre représente la décomposition du dioxyde dazote.…
a) Faux. Le réactif est $2\ NO_{2(g)}$. b) Vrai. c) Vrai. d) Faux. $\Delta H$ est négative (-66,4 kJ). e) Faux. Elle est de +33,2 kJ/mol de $NO_2$.
-
which of the following changes to earths atmosphere would increase the …
- increasing the concentration of $\text{CO}_2$ - increasing the amount of water vapor
-
based on the information above, which of the following statements are t…
- Earth's average temperature is warmer than it would be if Earth's atmosphere did not contain any greenhouse gases. - After infrared radiation is trapped in the atmosphere, the i…
-
1. draw the structure of the alcohol, carboxylic acid and ester needed …
C - C - C - C - C - C - C - O - H | | | | | | | | H H H H H H H H ``` (1-Octanol: CH₃(CH₂)₇OH, all bonds drawn) ``` O || C - O - H | CH₃ ``` (Acetic acid: CH₃COOH, all bonds drawn…
-
org/resource/1b944d4a-6408-41e3-bb01-39845bd63cff/chemistry-203-separat…
## 4-5 Different Ways to Separate Mixtures: 1. **Magnetic Separation**: Use a magnet to pull out magnetic components from non-magnetic ones in a mixture. 2. **Filtration**: Pass a…
-
1. draw the structure of the alcohol, carboxylic acid and ester needed …
### Structure of alcohol (Ethanol): ``` H H | | H — C — C — O — H | | H H ``` ### Structure of carboxylic acid (Benzoic acid): ``` O || H — O — C — C₆H₅ (where C₆H₅ is the benzene…
-
3. this is a diagram of ammonia. this molecule has a central nitrogen a…
D) trigonal pyramidal
-
determine the volume in ml of a 0.250 m solution of hydrochloric acid n…
20.0
-
to calculate the percent error (% error) we use: |experimental value - …
6.7%
-
to calculate the concentration of a dilution we use: $c_{stock} \\times…
330 mL (the option with "330 mL")
-
part: 1 / 2 part 2 of 2 write the net ionic equation for the precipitat…
To solve this, we need the precipitation reaction from Part 1 (which isn't provided here). However, a general example of writing a net ionic equation for a precipitation reaction …
-
note: reference the solubility of ionic compounds in water table for ad…
\( \ce{CuCl(aq) + NaI(aq)} \) (the option with \( \ce{CuCl(aq) + NaI(aq)} \))
-
part 2 of 2 zni₂(aq) + h₃po₄(aq) →
The balanced equation is \(3ZnI_2(aq)+2H_3PO_4(aq) ightarrow Zn_3(PO_4)_2(s)+6HI(aq)\) (If the question was to balance the equation. Since the original problem was a bit unclear b…
-
what is the net ionic equation for each of the following reactions? not…
\( 2\text{Li}(s) + 2\text{H}^+(aq) ightarrow 2\text{Li}^+(aq) + \text{H}_2(g) \)
-
select all of the following reactions that produce a precipitate. check…
- $\ce{NaOH(aq) + FeCl_{3}(aq) ->}$ (produces $\ce{Fe(OH)_{3}}$ precipitate) - $\ce{Zn(s) + FeBr_{3}(aq) ->}$ (produces $\ce{Fe}$ precipitate) - $\ce{BaCl_{2}(aq) + H_{2}SO_{4}(aq…
-
part 4 of 4 ba(no₃)₂ ○ soluble ○ insoluble cu(oh)₂ ○ soluble ○ insoluble
insoluble ### For $\boldsymbol{Ba(NO_3)_2}$:
-
classify each ionic compound as insoluble or soluble in water. select t…
soluble ### Part 2: $\boldsymbol{\ce{AgBr}}$
-
select the correct statements below. note: more than one statement may …
B. A precipitate can collect at the bottom of a vessel or be suspended within a solution, making the mixture appear cloudy D. A gas evolution reaction occurs when two aqueous subs…
-
8. what is the atomic number of an element? 9. what charge does a neutr…
b. neutral
-
7. who developed the periodic table? a. niels bohr b. anton van leuenho…
c. Dmitri Mendeleev
-
6. what family of elements am i in? a. co b. cl c. ba d. as e. pm f. fr…
Transition Metals ### Part b: Cl (Chlorine)
-
6. a chemical reaction produces 0.0125 mol of oxygen gas in 3 minutes a…
a) $12.5\ \text{millimoles}$ b) $210\ \text{seconds}$ c) $\frac{12.5}{210} \approx 0.0595\ \text{millimoles per second}$
-
this energy diagram shows the allowed energy levels of an electron in a…
D ### 2. How many excited states are there?
-
Question was provided via image upload.
c) This image is a compound because different elements have combined with each other ### Question 2 (Explanation)
-
date: teamwork makes the dream work: read the question and then answer …
d. \(NO_2\) ### Question 2
-
2. which element below belongs to the noble gas family? a) group 1 peri…
d) Group 18 period 3 ### Question 3
-
name: date: teamwork makes the dream work: read the question and then a…
- More reactive pair: Sr and Ba (they are alkaline earth metals in Group 2, have 2 valence electrons, and readily react by losing electrons). - Less reactive pair: Ne and Ar (they…
-
name: _______________ date: _______________ teamwork makes the dream wo…
d. Li and Cs ### Question 3 (Least Similar Properties)
-
date: the periodic table daily question: how does the periodic table he…
The Periodic Table helps us better understand each element by: - Organizing elements by atomic number (proton count) to show atomic structure. - Classifying elements as metals (le…
-
independent work 1. which of these determines the identity of an elemen…
b. Number of protons ### Question 2 To fill the table, we use: - Electrons in neutral atom = Protons. - Atomic Mass = Protons + Neutrons. #### Titanium: Neutrons = Atomic Mass - P…
-
name: date: atomic number = # of protons = # of electrons example: brom…
Atomic mass: 7 amu, Atomic number: 3. Explanation: Atomic mass is protons + neutrons (3 + 4 = 7), atomic number is number of protons (3). ### Question 2:
-
22. an apothecary is a person who prepares and sells drugs or compounds…
22. Poison. 23. The conclusion occurs rapidly: the two rioters kill the third, and then immediately die from drinking the poisoned wine he brought. 24. Their greed for the gold co…
-
for the next four reactions you will need to determine what the product…
### Part g: | Reactants | Before Balancing | After Balancing | Products | Before Balancing | After Balancing | |-----------|------------------|-----------------|----------|-------…