Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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how many particles are in one mole? a. 6.022×10^{23} b. 2.066×10^{23} c…
A. $6.022\times 10^{23}$
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1 type the correct answer in the box. use numerals instead of words. gi…
5
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aquariums mastery check show your mastery of the learning targets by co…
B. Ammonia
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question 5. when setting up a pre - press profile, which color scheme i…
C. CMYK
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19 logan had an ice pack on his swollen knee. most likely what receptor…
C. thermoreceptor
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determine laquelle des configurations électroniques suivantes nest pas …
26) Valide 27) Invalide, l'orbital $3p$ est manquant. 28) Invalide, l'ordre d'occupation des orbitales est incorrect. 29) Valide 30) Valide
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question 12 (1 point) which of the following is buffer comprise? a stro…
None of the given options are correct. A buffer is typically a weak acid and its conjugate base or a weak base and its conjugate acid.
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question 11 (1 point) which of the following is not a type of intermole…
A. Covalent bond
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question 7 which of the following best describes a molecule that is a h…
unsaturated fat
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chemical energy is the energy stored in the chemical bonds that hold mo…
The statement in option A is incorrect as we get energy from the chemical energy stored in the food's chemical bonds, not from the kinetic energy of constantly moving molecules in…
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according to the law of conservation of energy, energy cant be created …
A. there is a limited supply of them and we can't make any more.
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using the four steps to critique artwork. 1. describe the artwork. 2. a…
How did the artist use vanishing point(s) and orthogonal lines?
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hydrogen has three isotopes ^1h, ^2h, and ^3h. what is the difference b…
The number of neutrons ranges from 0 to 2.
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in which orbitals would the valence electrons for selenium (se) be plac…
C. s orbital and p orbital
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which of daltons ideas about the atom did j.j. thomsons experiment disp…
It disproved that atoms are indivisible.
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which statement best describes how electrons fill orbitals in the perio…
Electrons fill orbitals in order of their increasing energy from left to right.
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which element has 32 protons in its nucleus? phosphorus cobalt germaniu…
C. germanium
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a single atom of an element has 11 protons, 11 electrons, and 12 neutro…
B. Na
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who was the first to propose the existence of atoms? john dalton democr…
B. Democritus
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4. a reference gives the density of calcium as 1.54 g/cm³. based on lab…
$18.83\%$
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which best describes matter at the atomic level? a) submicroscopic b) m…
A. submicroscopic
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who first identified the element radium? charles richard drew enrico fe…
D. Marie Curie
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pictured above are three aluminum atoms. this time notice that there is…
There will be a flow to the left
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mendeleev arranged the elements by what physical property? boiling poin…
atomic mass
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what is one way to describe elements? they are the building blocks of m…
They are the building blocks of matter.
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which correctly links the branch of chemistry with a sample application…
B. Organic chemistry—developing new plastics and materials
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what happens when aluminum fills its valence shell? three electrons are…
C. Three electrons are lost, creating $\text{Al}^{+3}$
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a friend tells you knowing science makes it more fun. how would you bes…
Horseplay increases the likelihood of accidents and can damage the equipment.
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what are groups 1, 2, and 3 examples of on the periodic table? noble ga…
metals
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select a word from the drop - down menu to correctly complete the state…
Group
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mike reads the instructions and decides to mix two chemicals before rea…
He should stop and read the entire procedure carefully before continuing the experiment.
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during an experiment, mike rushes through the instructions and decides …
None of the above options are correct.
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a friend tells you \playing games during a lab makes it more fun.\ how …
C. Horseplay increases the likelihood of accidents and can disrupt the experiment.
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how do the atomic mass and atomic number compare for helium? helium doe…
The atomic mass is greater.
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what would a green color in a benedicts solution mean? no simple sugars…
Small amounts of simple sugars
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what differs between a radioactive isotope and a stable isotope of the …
Radioactive isotopes last for less time.
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what does an atomic number represent in an atom? number of protons numb…
number of protons
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a neutral atom possesses an atomic number of 13 and an atomic mass of 2…
B. outside the nucleus
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the isotope of an atom containing 40 protons and 51 neutrons suddenly h…
Zirconium-93
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the isotope of an atom containing 40 protons and 51 neutrons suddenly h…
B. Zirconium - 93
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the isotope of an atom containing 40 protons and 51 neutrons suddenly h…
B. Zirconium - 93
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hydrogen bonds between water molecules create a force called cohesion. …
Water molecules sticking to each other.
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multiple - choice question what informational clues can paleoclimatolog…
B. chemical composition of the atmosphere C. precipitation levels
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directions: answer the questions with the proper information using your…
1. a. Mg b. K c. Fe d. Cu 2. a. Carbon b. Chlorine c. Gold d. Strontium 3. a. 1 b. 4 c. 5 d. 5 4. a. 16 b. 2 c. 17 d. 8 5. Ti 6. Ag 7. Kr 8. 200.59 9. Nickel 10. Cl 11. 11 12. Ti …
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inscrit le nombre délectrons de valence, le groupe et la période pour c…
8) Bore: 3 électrons de valence, groupe 13, période 2 9) Sodium: 1 électron de valence, groupe 1, période 3 10) Fer: 2 électrons de valence, groupe 8, période 4 11) Brome: 7 élect…
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given what naomi knows about physical development across the life span,…
1. Carson 2. formal operational
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in order to prevent bending, sagging, distorting and scratching, what i…
A. in pipe racks
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when water molecules stick to the walls and other substances it is call…
C. Adhesion
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38. match each of the following hair textures with its styling tips. a.…
- Chemical services may take longer to process: b. Straight, coarse hair; j. Curly, coarse hair - Remove some interior weight with texture shears: a. Wavy, medium hair; e. Curly, …
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5 multiple choice 1 point give me an example of a chemical contaminant.…
C. Sanitizer
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2 true or false 1 point a chef can apply chemicals in his restaurant to…
False
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which of the following is an example of nonpoint source water pollution…
ocean of trash from an entire world
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why is thermal pollution a problem? hot chemicals are dumped into ocean…
Hot water from power plants is dumped in lakes which decreases oxygen in the water and kills fish.
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what is the difference between cohesion and adhesion of water molecules…
Water sticks together in cohesion and to other substances in adhesion.
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you observe a balloon filled with gas. as the temperature increases, th…
C. Charles' Law
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which gas law shows the relationship between pressure and volume only? …
C. Boyle's Law
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only 2 electrons can fit in level 1 only 8 electrons can fit in level 2…
How many protons does your element have? 11 How many neutrons does your element have? 17 What is the charge of your element? 0
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question 5 which gas law shows an indirect relationship? boyles law avo…
A. Boyle's Law
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6) draw the following lewis dot structures using the periodic table. (s…
The Lewis dot structure for Br has the symbol 'Br' with 7 dots around it, with 2 dots on one side and 1 dot on each of the other three sides.
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you increase the temperature of a can that contains gas. what law would…
B. Gay - Lussac's Law
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2 the density of zinc is 7.1 grams per cubic centimeter. the table show…
Substance 3
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as you decrease the volume of a balloon, the pressure increases. what g…
C. Boyle's Law
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which law describes the relationship between volume and temperature for…
D. Charles' Law
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question 3 when monomers are linked together they form a ____________ a…
b. polymer
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what does dr. lanyon notice about the powders found in dr. jekylls draw…
The powders look rare and appear to be of the highest quality.
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practice it! select the atom(s) are found in nucleic acids. phosphorus …
phosphorus (P), hydrogen (H), nitrogen (N), carbon (C)
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chemistry safety quiz 1. which piece of lab ware is the best tool for m…
# Explicaciones Breves: 1. El probeta graduated (d) es la mejor herramienta para medir 100 ml de agua ya que está diseñado para mediciones precisas de volúmenes. 2. Un extintor de…
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determine the location of the last significant place value by placing a…
1. 80\(\overline{4}\)0 2. 0.03\(\overline{0}\)0 3. 699.\(\overline{5}\) 4. 2.00\(\overline{0}\)×10² 5. 0.901\(\overline{0}\)0 6. 90,\(\overline{1}\)00 7. 4.\(\overline{7}\)×10⁻⁸ 8…
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atomic structure parts of an isotope and ion use the atomic symbol to f…
| Atomic Symbol | Atomic Number | Mass Number | # of Protons | # of Neutrons | # of Electrons | Isotope or Ion? | Ionic Charge | |---|---|---|---|---|---|---|---| | $_1^2H$ | 1 | …
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measurement can only be as accurate and precise as the instrument that …
1. 1 2. 2 3. 3 4. 4 5. 1 6. 4 7. 6 8. 1 9. 4 10. 5
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which pair of names is identical? dr. william h. schemerhorn dr. willia…
Ms. Julia P. Youngman Ms Julia P. Youngman
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which element has an atomic number of 75? technetium rhenium tungsten
B. Rhenium
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which element has 16 protons in its nucleus? sulfur arsenic selenium
Sulfur
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which element has 15 protons in its nucleus? phosphorus sulfur selenium
Phosphorus
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which element has an atomic number of 19? calcium potassium sodium
Potassium
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correct the one error. carlotta_valdes it took me three hour to finish …
It took me three hours to finish my chemistry homework last night.
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18. which describes an element? a. a mixture of different substances b.…
B. A pure substance made of one type of atom
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which element has an atomic number of 19? calcium potassium sodium
B. Potassium
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12. what determines the boiling point of a substance? a. the color of t…
C. The intermolecular forces between particles
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which element has 34 protons in its nucleus? phosphorus sulfur selenium
Selenium
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5.64×12.458 = 70.26312 how many sig figs should i round this answer to?…
3
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d. a solid changes to a gas 11. which is a characteristic of a colloid?…
b. Particles scatter light
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7. which type of mixture has particles that settle over time? a. soluti…
7. b. Suspension 8. d. Buoyancy 9. c. A pure substance made of different elements chemically combined 10. b. A solid changes to a liquid 11. b. Particles scatter light
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30 type your answer... zinc 65.39 atomic #: type your answer... atomic …
ATOMIC #: 30 ATOMIC MASS: 65.39 # OF PROTONS: 30 # OF NEUTRONS: 35 # OF ELECTRONS: 30
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9. which best describes a compound? a. a pure substance made of one typ…
c. A pure substance made of different elements chemically combined
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7. which type of mixture has particles that settle over time? a. soluti…
b. Suspension
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5 fill in the blank 1 point 8 o type your answer... 15.999 atomic #: ty…
ATOMIC #: 8 ATOMIC MASS: 15.999 # OF PROTONS: 8 # OF NEUTRONS: 8 # OF ELECTRONS: 8
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5 fill in the blank 1 point: 8 o type your answer... 15.999 atomic #: t…
ATOMIC #: 8 ATOMIC MASS: 15.999 # OF PROTONS: 8 # OF NEUTRONS: 8 # OF ELECTRONS: 8
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4 fill in the blank 1 point to calculate the number of neutrons in any …
protons
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3 fill in the 1 point the number of electrons in a neutral atom will be…
protons
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elements in the same group have similar chemical and physical propertie…
1. B. True 2. A. True
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fill in the blank 1 point omic mass is the average number of answer and…
protons, neutrons
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4. which of these is an example of a homogeneous mixture? a. pizza b. s…
B. Salt water
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5. what is the process called when a solid changes directly to a gas? a…
d. Sublimation
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which best describes an electron? the heaviest particle in an atom wher…
The part of an atom that is negatively charged
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how many electrons are in an uncharged atom? the same as the number of …
the same as the number of protons
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when does an atom have a neutral charge? when the number of protons is …
when the number of protons equals the number of electrons
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why is most of the space occupied by an atom empty space? because the e…
because the electrons orbit the nucleus much like the planets orbit the sun
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which of these is accurate about the amount of space an atom occupies? …
most of the space is empty
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which of these makes up most of the mass of an atom? protons + neutrons…
protons + neutrons