化学
化学反応、化学量論、分子構造、元素の性質。
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how does the hydroelectric dam pictured here impact the environment? a)…
A. By blocking fish migration
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the calculation of the density of a metal using water displacement. den…
## Part A - B. 11.2 g gold and 14.9 g gold - D. 15.2 g copper and 50.0 g copper ## Part B - Value: 6.1 - Units: g/mL
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during a dehydration synthesis reaction, a hydrogen atom is removed fro…
water
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part a study the picture of copper. how many connections or bonds does …
8
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directions: answer each question by circling the correct choice. after …
1. Blue 2. Yellow 3. Yellow - Green 4. Sky Blue 5. Red 6. Sky Blue 7. Purple 8. Sky Blue 9. Green 10. Red 11. Blue 12. Purple 13. Yellow - Green 14. Red 15. Sky Blue 16. Yellow - …
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part f which states of matter could your two models of water represent?
Liquid, solid (or liquid, gas)
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what type of absorbent was used to clean up the large chemical spill in…
Spill Pillows
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question 9 of 10 read the paragraph. then select the correct answer. at…
related to building
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multiple - choice question when diluting concentrated acid with water y…
Add acid to the water slowly while stirring
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part e water can exist in three different states of matter: solid, liqu…
Yes, this demonstration shows how the distance between water molecules can change. The molecules were more tightly - packed on one sheet of paper because the same number of molecu…
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question 1 what three conditions must be present for minerals to form t…
Question 1: Availability of elements, appropriate physical - chemical conditions, sufficient time for crystallization. Question 2: Metallic luster is like a metal's shine and refl…
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part c now build a model of liquid water. place your materials on a she…
Accurately representing the 3 - D structure and bond angles, and maintaining model stability.
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question 11 (3 points) properties of some solutions solution conductivi…
Solution 1
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part b are all the molecules in the picture the same? explain.
Without seeing the picture, it is impossible to determine if all the molecules in the picture are the same.
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nitrogen is mostly used to make...
Fertilizers
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what is wrong with the lewis dot formula shown? nitrogen has wrong numb…
Nitrogen has the wrong number of valence electrons.
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which of these elements is the most chemically reactive? a. germanium (…
D. Potassium (K)
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part a study the picture of liquid water at the molecular level. descri…
Oxygen and hydrogen atoms in water are connected by polar - covalent bonds within a molecule, and hydrogen bonds form between different water molecules.
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based on the periodic table of the elements, which of these elements ha…
C. barium (Ba)
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for all formula write the names to fill in the table or names given ide…
| Formula | Name | Ionic | Covalent | If Ionic - give the cation charge | | ---- | ---- | ---- | ---- | ---- | | $\text{Al}_{2}(\text{SO}_{4})_{3}$ | Aluminum sulfate | $\checkmar…
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which set of elements has the most similar physical and chemical proper…
C. K, Cs, Fr
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marcos and helen study the electron configurations of neutral atoms. th…
D. family
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which list of elements contains only metals? a. iodine, copper, argon b…
D. Tin, copper, cesium
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which of the following is unique for any given element? a. the mass of …
C. The number of protons
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the diagrams show part of the periodic table of the elements. the shade…
A. Option Text
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part e salt is both strong and brittle. these properties relate to its …
No, a toothpick is not a good model for showing the strength and brittleness of salt.
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which of the following describes how phosphorus cycles throughout earth…
Phosphorus is mostly found in ocean waters before cycling into a gaseous phase. (This statement is incorrect as phosphorus has a very limited gaseous phase in its cycle, making it…
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item 5 perform each calculation to the correct number of significant fi…
108.0
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for all formulas write the names to fill in the table or names given id…
| Formula | Name | Ionic Compound | Covalent Compound | If Ionic - Cation Charge | | ---- | ---- | ---- | ---- | ---- | | $(NH_4)SO_4$ | Ammonium sulfate | √ | | + 1 | | $O_2$ | O…
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question 7 (2 points) when a phase change is occurring (assume a pure s…
True
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what is wrong with the lewis dot formula shown?
The sulfur atom likely has an incorrect number of valence electrons shown and the atoms are not clearly labeled, making it difficult to assess the accuracy of the bonding and elec…
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true/false if you believe the statement to be more true than false, wri…
True/False: 1. F 2. F 3. F 4. T 5. F 6. F 7. F 8. F Fill - in - the - Blank: 1. Glucose 2. Epinephrine 3. sublingually 4. Side effects 5. liquid medications 6. drug
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question 5 (2 points) listen which of the following is a common acid? b…
B. Orange juice
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which strategies did the united states employ in order to achieve victo…
B. island - hopping D. bombing
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part c now build a model of salt. place your materials on a sheet of pa…
Possible difficulties could be maintaining the correct spatial arrangement of atoms, ensuring proper bonding representation with toothpicks, and keeping the model stable.
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question 4 (2 points) when a salt is formed as a result of an acid/base…
None of the above options are correct.
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question 4 (2 points) when a salt is formed as a result of an acid/base…
None of the above options are correct.
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distinguish between the absolute error and the relative error in a meas…
1. For large absolute error but small relative error: D. A company projects sales of $7.30 billion and true sales turn out to be $7.32 billion. 2. For small absolute error but lar…
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distinguish between the absolute error and the relative error in a meas…
1. C. The absolute error describes how far a measured (or claimed) value lies from the true value. The relative error compares the size of the absolute error to the true value and…
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23 type the correct answer in the box a bathtub is filling with water a…
$29.3$
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match each molecular formula to the corresponding empirical formula. c₄…
$CH_3O$ → $C_4H_{12}O_4$ $CH_5O$ → $C_2H_{10}O_2$ $C_2H_4O$ → $C_4H_8O_2$
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given: 2al + 6hcl → 2alcl₃ + 3h₂. if the chemical reaction produces 129…
B. 2.92
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part b do the atoms in salt follow a pattern? explain your answer.
Yes, the atoms in salt follow a pattern. The sodium and chloride ions in sodium chloride form a cubic - crystal lattice structure where each sodium ion is surrounded by six chlori…
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select the correct answer. what is the percent composition of silicon i…
A. 28%
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type the correct answer in the box. express your answer to three signif…
311 K
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ch.- 16 state government fill in the blanks. 1. india has ______states …
1. 28, 8; Central or Union Government; 25; Question Hour; Governor 2. A. Member of Legislative Assembly; 30 years; 6 years; Ahmedabad; The power or authority to make legal decisio…
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9. practice: classification of matter question 1 how would you calculat…
Calculate using the formula $A = m_{107}\times a_{107}+m_{109}\times a_{109}$ with known isotope masses and abundances. ### Question 2
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question #5 - study these beakers...if the visible dots represent h+ io…
Solution A is likely an acid because it has the highest concentration of H+ ions as indicated by the largest number of visible dots representing H+ ions.
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part a study the picture of salt at the atomic level. describe the conn…
The sodium and chlorine atoms in salt are connected by ionic bonds. The electrostatic attraction between the positively charged sodium ions (Na⁺) and negatively charged chloride i…
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question 35 (2 points) listen which type of bond is responsible for hol…
D. covalent
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what type of form is the sculpture using? (david smith, cubi xix) selec…
B. geometric
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question #4 - is the color of the liquid being tested related to ph? be…
Yes, the color of the liquid being tested can be related to pH, especially when pH - sensitive indicators are used.
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question 31 (2 points) listen an acid is a compound that liberates ____…
D. $H^{+}$, decrease
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question 30 (2 points) listen which type of bond exists between water m…
E. hydrogen
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given: 4na + o₂ → 2na₂o. in this chemical reaction, how many moles of n…
1.45
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what is the mass of one mole of phosphorous (p) atoms? express your ans…
30.97
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select the correct answer. james needs 4.20 moles of nabr for an experi…
A. 425
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warm - ups 1) name a) 18f6 b) n2315 c) o2f2 2. write formulas for a) ca…
1. c) Dioxygen difluoride 2. a) $CCl_4$ b) $P_4Br_7$ c) $As_2S$ (assuming it's arsenic disulfide)
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select the correct answer. rachel has a sample containing 2 moles of ca…
A. $1.2044\times 10^{24}$ atoms
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which part of john daltons theory was disproved by j.j. thomsons cathod…
C. Atoms are indivisible.
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what is unique about how the periodic table of the elements is organize…
Elements with similar properties are grouped together in a pattern.
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a scuba divers air tank contains oxygen, helium, and nitrogen at a tota…
B. 103 atm
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question 35 (2 points) which of these represents the correct ordering o…
hydrogen, ionic, covalent
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question 33 (2 points) listen an acid is a compound that liberates ____…
C. $H^+$, decrease
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what is the percent composition of hydrogen in a compound if the mass o…
C. 15.0%
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select the correct answer. the mineral benitoite is a gemstone for maki…
A. $BaTiSi_{3}O_{9}$
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question 16 (2 points) a combination of two or more atoms joined by a b…
B. a molecule
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this type of shape is composed of unpredictable, irregular lines? selec…
C. organic
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question 13 (2 points) listen which of these represents the correct ord…
D. hydrogen, ionic, covalent
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question 24 (2 points) listen muscles are designed to provide what func…
motion and support of our moveable skeleton
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closure: on a piece of paper, draw two demand curves (two different gra…
The demand curve for chemotherapy will be more inelastic (steeper) compared to the demand curve for cookies. When drawing the two demand curves on a graph with price (P) on the ve…
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in a two - dimensional work, when the figure becomes the background and…
D. a figure - ground reversal
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directions: choose the term that best completes the second relationship…
1. Science; Scientific method 2. c. Physicians 3. D. Organic
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a shape on a flat picture surface that is defined by surrounding empty …
A. an implied
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look for chlorine with symbol cl and atomic number 17. is it a metal, n…
Nonmetal
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look at francium with symbol fr and atomic number 87. what is its group…
Group 1 Period 7
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3 li lithium 6.941 how many neutrons does the element lithium have? 6.9…
C. 4
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how many neutrons does the element polonium have? polonium 84 po 209 hi…
125
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how many protons does the element xenon have? 77 54 131 131.29
B. 54
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identify the type of organic compound shown below: ch3 - c = o | o | ch3
Ester
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a physical reaction is_____. a change that does not make something new …
1. a change that DOES NOT MAKE SOMETHING NEW and different from the starting substances 2. 54
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what element is represented by the following bohr model? aluminum hydro…
C. Magnesium
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the compound shown here is what type of organic compound?
Aromatic compound
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what element is represented by the following bohr model? o potassium o …
Chlorine
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identify the following question as a physical or chemical change you co…
Chemical Change
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adapted from presidential retreat by the national parks service camp da…
a piece of relevant supporting evidence
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when water boils (liquid to a gas)and becomes steam that is called? mel…
B. Evaporation
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reading check 1. which of the following is a subatomic particle? a. car…
1. c. Electron 2. a. Protons, c. Neutrons 3. d. An atom of oxygen has 8 protons. 4. a. Molecules are made of several atoms bonded together.
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identify the best iupac name for the compound having the condensed form…
4-ethyl-1,1,1-trimethylhexane
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the reactants are. choose one option. a the substances present when the…
The question seems incomplete as it doesn't clearly state what needs to be done with the options (e.g., which one is correct). However, based on the content, the discipline is Nat…
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the tiny particles that make up matter are called atoms. true false que…
- First question: True - Question 6: D. carbon - Question 7: True
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from the periodic table, it can be determined that iron (fe) has an ato…
107 amu
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which of the following molecules shows two atoms of hydrogen (h)? (1 po…
$H_2SO_4$
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what does the law of conservation of mass say about a chemical reaction…
In a chemical reaction, mass is neither created nor destroyed.
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match the correct word with its definition. element choose matter choos…
Element: Pure substance made up of only one kind of atom Matter: Has mass and takes up space Atomic Weight: The number of neutrons and protons in an element Atomic Number: The num…
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what are the reactants in a chemical formula? (1 point) the atoms left …
the atoms prior to the chemical reaction, found on the left side of the equation
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question 1 - 2 hydrogen bonding is responsible for unique properties of…
C. A hydrogen bond forms between the oxygen atom of one water molecule and the oxygen atom of a different water molecule
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presidential retreat adapted from the national park service catoctin mo…
1. The park was originally used for several different camps, including a family camp for federal employees. 2. President Franklin D. Roosevelt needed a summer retreat, to escape D…
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the graduated cylinder below shows major scale divisions every 5 ml. ho…
37.0 mL
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which change is likely to happen to an atom of the element strontium (s…
It will give up electrons, forming a positive ion.