化学
化学反応、化学量論、分子構造、元素の性質。
-
which statement best summarizes the way the sun produces energy? (1 poi…
Fusion reactions in the sun convert small amounts of matter into large amounts of energy.
-
10. which of the following affect your ideas about gender? (check all t…
B. Genes and hormones C. Social lessons D. Cognitive schemas
-
the periodic tables largest group, ____, includes radioactive elements.…
C. transition metals
-
how is the mass number calculated for an atom involved in nuclear fusio…
It is the number of protons plus neutrons.
-
examples of alloys include steel, colored gold, and ___. helium iron br…
C. brass
-
use the equation to answer the question. (_{1}^{2}h+_{1}^{2}h ightarrow…
There are two atoms with mass numbers of 2.
-
which phase change is the opposite of boiling? (1 point) condensation m…
condensation
-
____ helps dissolution by dispersing and evenly spreading a solute with…
D. Agitation
-
the chart describes characteristics of * particles are small enough tha…
C. aqueous solutions
-
combining substances physically results in a ____. mixture molecule sol…
A. mixture
-
the same quantity of each solute is added to water. which solution will…
strong acid
-
which element group conducts heat and electricity and can be stretched …
D. metals
-
which answer completes the chart? 26 fe iron 6.941 chemical symbol elem…
atomic number
-
a substance has a ph of 6.0. how would it be classified? (1 point) stro…
weak acid
-
5. choose the best answer. the element ____ is found in organic compoun…
5. C. carbon 6. D. a bond
-
3. choose the best answer. found in air and water, ____ is the earth’s …
3. D. oxygen 4. A. both metals and nonmetals
-
a(n) ____ is created when elements are combined chemically, and it can …
A. compound
-
in a solution, which pair of actions could combine to keep a concentrat…
adding solute, then removing solution
-
1. look at the table. then, choose the best answer. chemical compounds …
sand
-
carbonated beverages contain dissolved carbon dioxide gas. which temper…
Low temperatures are best to maximize the solubility.
-
which term refers to the substance that is dissolved into another subst…
C. solute
-
there are 500 molecules in an airtight bucket, and the volume is held c…
adding 100 more molecules and increasing the temperature by 10K
-
elements with their electronegativity element electronegativity bromine…
bromine and nitrogen
-
which phrase best describes electronegativity? (1 point) ○ the partial …
the relative strength with which an element attracts electrons in a chemical bond
-
the boiling point of methanol is 64.7°c. its melting point is -97.6°c. …
liquid
-
based on their locations in the periodic table, which two elements are …
Nitrogen (N) and oxygen (O)
-
covalent and ionic bonding quick check which statement about sodium chl…
The sodium atom transfers electrons to the chlorine atoms to form ionic bonds.
-
science kids: the periodic table of elements madelyn roque 3. about how…
C. 40
-
science kids: the periodic table of elements madelyn roque 2. the colum…
B. families
-
which element has similar chemical properties as sodium but has 7 energ…
Francium (Fr)
-
which of the following equations demonstrates the law of conservation o…
$CH_4+O_2 ightarrow C + 2H_2O$
-
2 grams of potassium (k) reacts with 5 grams of oxygen (o). according t…
7 grams
-
78 g of potassium (k) react with 71 g of chlorine (cl) to produce potas…
149 g
-
conservation quick check if the mass of elements before a chemical reac…
30 grams
-
what does the law of conservation of mass state? (1 point) matter canno…
D. The total mass of all of the reactants prior to a chemical reaction must equal the total mass of all the products after the reaction.
-
astatine (at), iodine (i), chlorine (cl), bromine (br). which of the fo…
Chlorine (Cl)
-
which is true regarding the element in period 2, group 8? small atomic …
high ionization energy, low electronegativity, small atomic radius
-
which of the following will have a lower ionization energy than scandiu…
Calcium (Ca)
-
which of the following will have a higher electronegativity than arseni…
Carbon (C)
-
explain what happens with the water molecules when you heat up a pot of…
When a pot of water is heated, the water molecules absorb heat energy, increasing their kinetic energy. They move faster. The water stays as a liquid until it reaches the boiling …
-
which of the following elements has the smallest atomic radius? argon (…
Helium (He)
-
name: using science skills id: a element symbol protons neutrons electr…
32. 12 33. 8 34. 13 35. Helium 36. None in the table 37. Drawing an atom of nitrogen: Nitrogen has atomic number 7 (7 protons, 7 electrons), and common isotope has 7 neutrons. Dra…
-
neon (ne) carbon (c) antimony (sb) germanium (ge) which of the followin…
Carbon (C)
-
of the halogens, which has the smallest radius? 4/10
F
-
which of the following has the greatest electronegativity? o n cs he
O
-
the atom with the largest atomic radius in group 18 is -
Rn
-
when the measured temperature goes up, the system releases energy. how …
exothermic
-
1. an atom has how many basic parts? a. two b. three c. four d. five an…
B. three
-
the temperature measured around the reaction increases during an experi…
The energy of the system decreases (releases energy).
-
science kids: the periodic table of elements madelyn roque 3. in what y…
A. 1869
-
when the measured temperature goes down, the system absorbs energy. how…
Endothermic
-
16) a chemist wishes to calibrate a bomb calorimeter, so she combusts 7…
D. $14.18\ kJ\ ^{\circ}C^{-1}$
-
in the equation 2h₂ + 1o₂ →→ 2h₂o if you change the 2h₂ to 3h₂ molecule…
The equation will produce three molecules of water.
-
it takes 1 molecule of nitrogen and 3 molecules of hydrogen to produce …
$2N_2$ and $6H_2$
-
which statement correctly explains why the ashes of burnt paper have le…
Some of the atoms in the paper became gases.
-
one molecule of calcium oxide, cao, and one molecule of carbon dioxide,…
$CaCO_3$
-
when iron rusts and forms iron oxide, the iron oxide has more mass than…
Iron oxide has oxygen atoms, and pure iron does not.
-
13. which is not a unit of measurement in the metric system? a. meter b…
13. b. inch 14. d. gram 15. d. protons, neutrons, and electrons 16. b. electrons 17. c. protons and neutrons 18. b. 11 19. d. two atoms of hydrogen and one atom of oxygen 20. b. s…
-
13. which is not a unit of measurement in the metric system? a. meter c…
15. d. protons, neutrons, and electrons 16. b. electrons 17. c. protons and neutrons 18. b. 11 19. d. two atoms of hydrogen and one atom of oxygen 20. b. sharing an electron pair …
-
1. what do we call a solid, liquid or gas that cant be broken into anyt…
An Element
-
5. sep analyze data find the second column, or group 2, of the periodic…
5. Elements in Group 2 are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), radium (Ra). They all have an $ns^{2}$ electron - configuration, with 2 valen…
-
these noble gas electron configurations can be used as a \short cut\. h…
1. [Ne]3s¹ 2. [Ne]3s²3p³ 3. [Ar]3d⁶4s² 4. [Kr]5s² 5. [Ar]3d¹⁰4s²4p⁵ 6. [He]2s²2p⁴ 7. [Ar] 8. [Ne]3s²3p¹ 9. [Rn]7s¹ 10. [Kr]4d¹⁰5s²5p⁴ Electron configuration of Uranium: 1s²2s²2p⁶3…
-
1. ccc patterns what patterns do you observe in the electron configurat…
1. Patterns include sequential filling of energy levels and orbitals following specific rules. 2. Completed table using electron - filling rules. 3. Rules are Aufbau principle, Pa…
-
the soil in forested wetlands has dark soil, which indicates a high lev…
organic matter
-
what does it mean when a reaction is described as \exothermic\? the rea…
The reaction releases energy to the surroundings in the form of heat.
-
what does it mean when a reaction is described as \endothermic\? the re…
The reaction absorbs energy from the surroundings as heat.
-
part 3: match each diagram with its correct description. diagrams will …
1. C 2. E 3. A 4. B 5. D
-
how do soils form? erosion transports mineral particles, and plants die…
Weathering breaks rocks into minerals, and plants die and decay
-
one more thing before you go... lets find out how much you learned abou…
Gloves and eye protection
-
select the correct answer from each drop - down menu. the chemical form…
Coefficient: 4 Sub - script of carbon: 10 Sub - script of hydrogen: 8
-
multiple choice. choose the one alternative that best completes the sta…
24) C. A substance composed of two or more pure elements in fixed, definite proportions. 25) C. those that a substance displays without changing its composition. 26) E. none of th…
-
multiple choice. choose the one alternative that best completes the sta…
24) C 25) C 26) A 27) D 28) A 30) B
-
lets find out how much you learned about this topic! this will help us …
To maximize airflow and minimize exposure to fumes
-
choose an answer and hit next. you will receive your score and answers …
last
-
which of the models is an example of a solution?
The third model (the red - colored uniform liquid in the beaker) is an example of a solution.
-
is the molecule polar or nonpolar? select the single best answer. polar…
Nonpolar
-
which of these is a safe lab practice? picking up a hot beaker with you…
Labeling all chemicals immediately.
-
what does this symbol indicate about a chemical? the chemical is flamma…
The chemical is an acutely toxic irritant.
-
atoms and ions assignment i symbol # of protons # of electrons electric…
| Symbol | # of protons | # of electrons | electric charge | | ---- | ---- | ---- | ---- | | $Li^+$ | 3 | 2 | $1+$ | | $C$ | 6 | 6 | 0 | | $F^-$ | 9 | 10 | $1-$ | | $Mg^{2+}$ | 12…
-
atoms and ions assignment i symbol # of protons # of electrons electric…
| Symbol | # of protons | # of electrons | electric charge | | ---- | ---- | ---- | ---- | | $K^+$ | 19 | 18 | $1+$ | | $He$ | 2 | 2 | 0 | | $O^{2 -}$ | 8 | 10 | $2 -$ | | $Cl^-$ …
-
practice: other qualities of the table 1. name the three subatomic part…
1. Proton ($p^+$), neutron ($n^0$), electron ($e^-$) 2. First: 2, Second: 8, Third: 8 3. The number of protons in an atom's nucleus 4. The sum of protons and neutrons in an atom's…
-
groundwater is a significant source of drinking water for many people. …
It may become contaminated with organic and inorganic chemicals that come from the soil above.
-
drugs drugs are chemical substances that change the way the body works.…
1. A drug is a chemical substance that changes the way the body works. Drugs used as medicine help treat, prevent, or diagnose illness. 2. Drugs can enter the body in four ways: o…
-
name drugs drugs are chemical substances that change the way the body w…
1. Drugs are chemical substances that change the way the body works, used as medicine to treat, prevent, or diagnose illness. There are prescription, over - the - counter, and ill…
-
tobacco use tobacco use is the leading cause of death and disability th…
1. F; Tobacco use during adolescence is harmful as it reduces the rate of lung growth and can lead to long - term health problems even if the person quits before adulthood. 2. F; …
-
dry ice is solid carbon dioxide that is used in the transport of food a…
sublimation
-
which changes of state do the labels represent? a b c
A. Condensation B. Evaporation C. Freezing
-
which changes of state do the labels represent? a b c
A. Sublimation B. Vaporization C. Melting
-
to find out the standard, custom, and pantone color codes applied to a …
Click Font on the Home ribbon, from the drop - down menu click the "More Colors" option.
-
multiple - choice question what is the name for this compound? nitrogen…
Trinitrogen Hexaoxide
-
multiple - choice question true or false charges have to be balanced fo…
False
-
methodology method: lab skill: off - gassing and stoichiometry procedur…
The mass percentage of \(NaHCO_3\) in the mixture (Pt. II) is approximately \(33.6\%\)
-
purpose (lo): to determine the percent composition of sodium bicarbonat…
The balanced equations are: 1. $2NaHCO_3(s) ightarrow Na_2CO_3(s)+H_2O(g)+CO_2(g)$ 2. $2NaHCO_3(s) ightarrow Na_2O(s)+2CO_2(g)+H_2O(g)$ 3. $2NaHCO_3(s) ightarrow Na_2CO_3(s)+CO_2(…
-
ionic and covalent nomenclature brittany kessler multiple - choice ques…
2+
-
multiple - choice question what do you do to your polyatomic ions when …
put parenthesis around it
-
atoms, elements, chemical bonds and enzymes 1. what is an atom made up …
1. Protons, neutrons, electrons 2. Protons: +, Electrons: -, Neutrons: neutral 3. In the nucleus 4. In electron - shells or orbitals around the nucleus 5. Number of neutrons = Ato…
-
what is the formula for this compound? □ cu₆(no₃)₆ □ cu(no₃)₂ □ cu₂(no₃…
$Cu(NO_3)_2$
-
multiple - choice question what is the name of mg(oh)2? magnesium (ii) …
C. magnesium hydroxide
-
multiple - choice question what is the chemical formula of calcium phos…
A. $Ca_{3}(PO_{4})_{2}$
-
which of these covalent bonds is polar, based on the electroneg? c - n …
C - N