化学
化学反応、化学量論、分子構造、元素の性質。
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how many elements are in the chemical formula h₂o? 2 4 1 3
2
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nitrogen gas + hydrogen gas forms ammonia gas. type of reaction = _____…
Synthesis
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am i a cation or an anion? how many electrons do i have? hint remember …
anion, 10 electrons
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stephanie is riding her bicycle to the park. the chemical energy used t…
C. mechanical energy
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what energy transformation occurs when a battery - powered flashlight i…
C. chemical to electrical to light
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choose the correct answer. 42% 12% 8% nutrient of feed a % nutrient nut…
12%
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according to the icd-10-cm official coding guidelines, if the patient i…
Malignancy
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drop size = 1ml/number of drops volume of objects object\twater volume …
To find the volume of each object, we use the principle of water displacement, where the object's volume is the difference between the water volume with the object and the water v…
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question 13 (1 point) listen which of the following are intensive prope…
Question 13: a) The density of copper is 8.94 g/cm³. d) The molar mass of nitrogen is 14.0 g/mol. e) Bromine gas has a reddish-brown color. Question 14: d) Broiling a steak on a g…
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question 11 (1 point) listen 42.0 ml of a liquid has a mass of 35.00 g.…
0.833 g/mL --- ### Question 12
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based on the data you collected, how would you expect soap to behave wh…
The amount of bubbles produced by the soap should decrease.
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question 10 (1 point) listen which one of these represents a physical c…
c) Water, when heated, forms steam
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question 8 (1 point) listen if a liquid with a specific gravity of 0.88…
5.63 mL --- ### Question 9
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question 6 (1 point) listen which one of these represents a chemical ch…
Question 6: b) Turning hair yellow with bleach Question 7: a) Boiling an egg. c) Burning gasoline.
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why did adding mineral oil decrease the volume of bubbles (suds) formed…
B. Mineral oil is nonpolar, so it interacts with the long nonpolar hydrocarbon chain, disrupting the soap micelle. (Note: In the original options, the second option's text is "Min…
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given the specific gravity of methyl alcohol 0.791, what is the mass of…
1. Mass of methyl alcohol: $1980\ \text{g}$ (or $1.98\ \text{kg}$) 2. Volume of benzene: $97.25\ \text{mL}$ 3. Volume of titanium cube: $0.134\ \text{cm}^3$ 4. Original water volu…
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1.6 specific gravity explain the difference between density and specifi…
1. **Difference between density and specific gravity**: Density is a measure of mass per unit volume of a substance (has units like $\text{g/cm}^3$). Specific gravity is a unitles…
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1.2 physical and chemical properties define and list examples of: physi…
1. **Physical properties** - Definition: Observable without altering chemical identity - Examples: Color, density, melting point, mass, volume 2. **Chemical properties** - Definit…
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unit 1 – foundations of chemistry – guided notes 1.1 classifying matter…
1. **Differences between solids, liquids, and gases**: - Solids: Have a fixed shape and fixed volume; particles are tightly packed in a regular arrangement, with only vibrational …
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which statement is the most effective claim? organic foods are a health…
A. Organic foods are a healthier option than conventional foods.
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background information: this is an excerpt from a speech given by egypt…
B. to protect its independence and liberty
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a vineyard has 145 acres of chardonnay grapes. a particular soil supple…
\( 3.23\times 10^{3}\) (or 3230)
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part a how many cubic centimeters are there in 2.11 yd³? express your a…
\(1.61\times10^{6}\) (or \(1610000\))
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multiple choice 1 point what often occurs to hydrocarbon chains in an a…
The branching characteristics of the chain changes
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multiple choice 1 point which of the following functional groups decrea…
Amino
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multiple choice 1 point the complexity and variety of organic molecules…
The chemical versatility of carbon atoms
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multiple choice 1 point which of the following functional groups increa…
Carboxyl
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multiple choice 1 point a carbon atom is most likely to form what kind …
C. Covalent
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multiple choice 1 point which of the following is the most electronegat…
Oxygen
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multiple choice 1 point when hydroxyl groups are added to a hydrocarbon…
Polar covalent bonds are formed making the molecule more hydrophilic
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multiple choice 1 point compared to a hydrocarbon chain where all the c…
Have less hydrogen atom
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5 multiple choice 1 point which chemical group is most likely to be res…
Amino
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multiple choice 1 point how many electrons does one atom of carbon shar…
4
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multiple choice 1 point research indicates that ibuprofen, a drug used …
Are mirror images of each other
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multiple choice 1 point a carbon atom has 6 electrons however, its vale…
Has only 2 electrons in its first shell and 4 in the second shell
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chm 1045 module 2 dimensional analysis assignments part iv. multi - ste…
16. $82.5\ \text{liters}$ 17. $\approx 7888\ \frac{\text{kg}}{\text{m}^3}$ 18. $324\ \text{mg per day}$ 19. $9.70\ \text{kg}$ (rounded to 3 significant figures) 20. $56.7\ \text{k…
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if a suspects computer is found in an area that might have toxic chemic…
a. Coordinate with the hazmat team.
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carbon-14 is an element that loses about 10% of its mass every millenni…
A. The graph starting at (0, 600) with an exponential decay curve decreasing rapidly then approaching 0
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complete the sentences with the correct phrases. maria works in a chemi…
1. always conducts 2. doesn't finish 3. can harm 4. would benefit
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7. what reports are located under the \assessment\ tab?: --select-- --s…
a. Admission Health History, Admission Assessment, Physician Progress notes
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processed foods make up 50 percent of the current american diet. though…
B. two chemical additives that sound very scary
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select the correct answer. which of these elements has two electrons in…
D. silicon (Si)
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drag each tile to the correct location. classify the chemical equations…
## Balanced: $2CO + 2NO ightarrow 2CO_2 + N_2$ $H_2CO_3 ightarrow H_2O + CO_2$ ## Not Balanced: $6CO_2 + 6H_2O ightarrow C_6H_{12}O_6 + O_2$ $2Cu + O_2 ightarrow CuO$
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select all the correct answers. which of these are examples of mixing a…
- removing seed casings from grains - a soda bottle bubbling when it is opened - removing salt from seawater
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select the correct answer from each drop - down menu. a molecule of chl…
chlorine is an element and carbon dioxide is a compound
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which of these elements is a metal? a. hafnium (hf) b. radon (rn) c. si…
A. hafnium (Hf)
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drag the tiles to the correct boxes to complete the pairs identify the …
Michael uses a car that burns fossil fuels. → combustion reaction Alan grows tomatoes on his farm. → photosynthesis Lisa eats eggs for breakfast. → respiration
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select the correct answer. which law represents a balanced chemical equ…
C. law of conservation of mass
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select the correct answer from each drop - down menu. the chemical form…
Coefficient: 4, Subscript of carbon: 10, Subscript of hydrogen: 8
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select the correct answer. which of these pairs of elements have the sa…
C. carbon (C) and lead (Pb)
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what is the iupac name for the compound shown? iupac name:
5-propylnonane
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part b review the videos, and then draw the structure shown. begin by a…
The molecular structure should be drawn as follows (description): A 5 - membered ring containing a sulfur (S) atom, fused with a 4 - membered ring containing two nitrogen (N, labe…
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10. based on the provided data, which of the following amounts of magne…
C. 0.5 g Mg and 30 mL HCl
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9. the scientist noticed that at the end of the combustion analysis, a …
B. Rerun the gas through the device to isolate pure oxygen gas.
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think like a scientist read about each scientific investigation. then a…
A. oxygen gas, $O_2$
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directions: read “our musical bonds.” then, answer the questions. 1. mu…
B. releasing a chemical in our brains ### Question 2
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question 6 2 points you add a chemical to water and the ph drops. the s…
An acid and the amount of H+ increases.
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question 5 (2 points) the bond between the elements in cl₂, also called…
Question 5: B. Covalent. Question 6: Acidic solution (Note: Since options were not provided for Question 6, this is the correct term for the described solution)
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music and mood music has the power to influence and shift our moods. li…
D. by comparing music that is sad to music that is uplifting ### Question 2
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match the term to its proper example. prompts 1 molecule (not compound)…
1. Molecule (not compound) - Ozone (O3) 2. Anion - Br- 3. Cation - Ca+2 4. Element - Zn 5. Compound - Salt (NaCl)
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application fuel 10 pts possible a fuel cell car is powered by electron…
1. 37.2 L
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the following equation describes the oxidation of ethanol to acetic aci…
5. 65.1%
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u5g5 3f₂(g) + w(s) → wf₆(g) how many grams of tungsten are required to …
3. 1550 g \(WF_6\)
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25) using the periodic table, predict which compound is ionic: (1pts) \…
$\boldsymbol{\square \ Rb_2SO_4}$ (checked option)
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24) using the periodic table, predict which compound is molecular. (1pt…
$\boldsymbol{SiO_2}$
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23) which element is not reactive? (1pts) silicon vanadium barium helium
helium
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23) which element is not reactive? (1pts) silicon vanadium barium heliu…
23. $\square$ silicon $\square$ vanadium $\square$ barium $\square$ helium 24. $\square$ MgO $\square$ FeS $\square$ NaOH $\square$ SiO$_2$
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21) which element is malleable, ductile, and a good conductor of electr…
21) Cu 22) transition metals
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20) which of the following is a metalloid? (1pts) i sb c s
□ Sb
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17) consider the chemical formula for one molecule of ethanol, c₂h₅oh. …
16) $\boldsymbol{29}$ 17) $\boldsymbol{30}$
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15) the number of nonmetal atoms in ca(mno4)2 is (1pts) 2 3 4 8
$\square$ 8
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13) the formula ca₃(po₄)₂ contains: (1pts) □ 4 oxygen atoms □ 5 nonmeta…
13) $\boldsymbol{\square}$ 4 oxygen atoms $\boldsymbol{\square}$ 5 nonmetals $\boldsymbol{\checkmark}$ 13 total atoms $\boldsymbol{\square}$ 14 total atoms 14) $\boldsymbol{\squar…
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12) the formula c₂h₅ch(cooh)₂ contains (1pts) 7 hydrogen atoms 4 carbon…
$\boldsymbol{\square}$ 8 hydrogen atoms
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11) which of the following formulas contains the fewest oxygen atoms? (…
A. $\text{Al(C}_2\text{H}_3\text{O}_2\text{)}_3$
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10) the number of nonmetallic atoms in (nh4)2so4 is (1pts) □ 5 □ 8 □ 10…
$\boldsymbol{\square}$ 15
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9) which of the following is a cation? (1pts) ☐ n³⁻ ☐ li⁺ ☐ o²⁻ ☐ fe²⁺
$\boldsymbol{\text{Fe}^{2+}}$
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8) which of the following is a member of noble gases? (1pts) □ chlorine…
□ chlorine □ oxygen □ nitrogen ☑ krypton
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6) the alkaline earth metals are in group ____. (1pts) □ 1a □ 2a □ 3a □…
6) 2A 7) nitrogen 8) helium
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5) the smallest particle of an element that can enter into a chemical r…
□ atom
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3) which of the following cannot be broken down by chemical or physical…
3) element 4) boron
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thinking about your answers above, what is the relationship between tem…
C. There is a direct relationship between temperature and pressure. Increasing temperature increases pressure. (Note: Assuming the third option has a typo "Incrasng" which should …
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question 5 (2 points) what is the anion in the formula - al₂(so₃)₃? the…
\( \text{SO}_3^{2-} \) (the option with "SO₃²⁻")
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question 3 (2 points) what is the name for co(no₃)₂? ○ cobalt (ii) nitr…
D. cobalt (II) nitrate ### Question 4
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question 1 (2 points) what is the formula for aluminum nitride? aln₃ al…
C. AlN ### Question 2
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1) the elements on the periodic table are placed in order of increasing…
1) atomic number 2) nonmetal
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7 multiple answer 1 point causes of soil pollution: (check all that app…
7. industrial waste, garbage, use of chemical fertilizers and pesticides, deforestation 8. True 9. True
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causes of air pollution: (check all that apply) □ vehicle exhaust □ tob…
1. Causes of air pollution: - ☑️ vehicle exhaust - ☑️ tobacco smoke - ☑️ construction activities - ☐ air purifier 2. Question 5: True 3. Question 6: True
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in \i, too,\ how does the speaker respond to racial exclusion? with den…
C. With hope and quiet resistance ### Second Question (How does the structure of "I, Too" reflect the poem’s message?):
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a car is driving along the road. what kind of energy is shown here? kin…
kinetic energy
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clothes are hanging from a clothing rod. what kind of energy is shown h…
B. gravitational potential energy
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an element with mass 420 grams decays by 11.8% per minute. how much of …
58.9
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the atomic number, which is the number of protons, is used to identify …
Protons: 10 Neutrons: 12 Electrons: 10 (the second option)
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question what is the symbol for the element scandium? scandium is in th…
D. Sc
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what is the symbol for the element germanium? germanium is in group 4a(…
A. Ge
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question an ion is a charged atom, due to an unequal number of protons …
$N^{3-}$
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what is the symbol for the element arsenic? arsenic is in group 5a(15) …
B. As
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what is the symbol for the element oxygen? oxygen is in group 6a(16) wh…
B. O
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question what element has the symbol f? this element is in group 7a(17)…
Fluorine (the option with "Fluorine" as the text, corresponding to the fourth circle in the options)
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question what element has the symbol ga? this element is in group 3a(13…
B. Gallium
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question what element has the symbol ca? this element is in group 2a(2)…
B. Calcium