化学
化学反応、化学量論、分子構造、元素の性質。
-
which oil product has the highest boiling point? kerosene (bp = -200°c)…
Asphalt
-
which of the following is an example of a polymer that can be created f…
styrofoam
-
what is the primary source of petroleum? decayed animal matter inorgani…
decayed animal matter
-
how do compounds separate based on their boiling points during fraction…
Low boiling point compounds vaporize first, collect at top; high boiling point ones stay near bottom.
-
write t for true or f for false. if false, rewrite the statement to mak…
6.14) T 6.15) F; All solutions are mixtures, but not all mixtures are solutions. 6.16) C 6.17) B 6.18) C 6.19) B
-
to a solution, more solvent is added to a solution. a. dissolve b. melt…
a.9) C. dilute a.10) B. alloy a.11) A. brass a.12) B. Pink gold is an alloy of yellow gold and copper metals.
-
5 multiple answer 3 points which of the following statements about cova…
- A. Covalent bonds form when atoms of nonmetals are close enough to each other for their orbitals to overlap. - D. Covalent bonds can be single, double, or triple bonds. - E. Cov…
-
which of the following statements is false concerning the first ionizat…
The IE of S is higher than IE of P
-
rank the following atoms in order of effective nuclear charge, from low…
\(Na<Al < Si < S < Cl\)
-
please name the following hazard symbol:
Biohazard, Toxic, Flammable, Health Hazard
-
4 multiple answer 3 points which of the following statements about meta…
- Metals in solid form have specific crystal structures. - The sea of electrons holds metal anions together throughout the entire solid. (Note: It should be cations, but the elect…
-
choose the best answers. 6.6 ___ the properties of solvents and solutes…
6.6 A. can 6.7 B. can
-
14 multiple choice 2 points a student claims that fluorine will form an…
Fluorine’s electronegativity is the highest on the periodic table, so it tends to gain electrons from metals but share electrons unequally with nonmetals.
-
rank the following atoms in order of effective nuclear charge, from low…
\(Na<Al<Si<S<Cl\)
-
13 multiple answer 3 points the following figure shows the bond formati…
B. The electrostatic attraction between the positive ion and negative chlorine forms an ionic bond; C. The resulting sodium cation has a stable octet in its valence shell; D. The …
-
12 multiple choice 1 point which of the molecules has the highest boili…
Liquid 4: \(CH_3CH_2CH_2CH_3\)
-
rank the following elements in order of decreasing metallic character (…
Mg > Be > O > Ne
-
11 fill in the blank 2 points fill in the blanks to complete the senten…
electrons; valence
-
choose the best answers. 6.1) ____ a(n) ____ is a mixture where all the…
6.1) A. solution 6.2) B. dissolves 6.3) air, salt in water, sugar in water, hot chocolate 6.4) C. solvent 6.5) C. solute
-
10 multiple choice 2 points a student writes the name nitrogen monoxide…
The correct name is nitrogen dioxide, because two oxygen atoms require the prefix di - (i.e., the option "The correct name is nitrogen dioxide, because two oxygen atoms require th…
-
9 multiple choice 3 points which of the following correctly matches eac…
\(CO_2\) - linear; \(BF_3\) - trigonal planar; \(H_2O\) - bent
-
amelie wants to make her home as safe as possible for her family. which…
Test to see whether a carbon monoxide detector works.
-
what is the main purpose of the high - temperature reaction? ○ to rearr…
To superconduct electricity
-
a neutral atom has the following characteristics: - it has 10 valence e…
Nickel or \(Ni\)
-
which three advancements were developments of the islamic golden age? a…
Arabic numerals, medical guidebooks, new chemical compounds.
-
which of the following groups of elements all have 4 valence electrons?…
C / Si / Ge / Sn
-
click on the element in the periodic table to explore the atomic radii …
\(A = 0.99\), \(B = 1.54\), \(C = 1.09\)
-
why is choking considered an emergency situation? it may block the flow…
It may block the flow of air in the body.
-
which diagram correctly represents the direction of the magnetic field …
- Question 2: The first diagram (assuming the first diagram has field lines going from N to S outside the magnet). - Question 3: It contains more electrons than protons.
-
1 multiple choice 2 points two elements, x and y, have electronegativit…
D. An ionic bond will form because the electronegativity difference is large, causing one atom to transfer electrons to the other.
-
select the choice that best completes the following statement. toxic va…
A. Chemical hazards
-
select the choice that best answers the following question. which of th…
C. Insulating rubber gloves
-
select the choice that best completes the following statement. all of t…
A. Thicker gloves are more chemical resistant
-
select the choice that best answers the following question. which of th…
a) Durable work gloves
-
select the choice that best answers the following question. which type …
A. Thick rubber and plastic gloves
-
read this passage: an official statement from the culinary institute in…
B. The information comes from an official statement.
-
2.020) which three statements are true regarding mixtures? some mixture…
Some mixtures maintain the physical properties of their substances, The materials in a mixture can be separated, A mixture is formed or separated by physical processes.
-
select the choice that best completes the following statement. the glov…
C. Thick rubber and plastic gloves
-
select the choice that best answers the following question. which type …
b) Harmful dust hazard
-
select the choice that best completes the following statement. overshoe…
B. Foot impact hazards
-
select the choice that best answers the following question. which of th…
C. They are insulated and protect against electric hazards
-
3. form a bond: select fluorine and turn on highlight shared electrons.…
Lewis Diagram: \( :\ddot{F} - \ddot{F}: \)
-
select the choice that best completes the following statement. overshoe…
B. Foot impact hazards
-
3. form a bond: select fluorine and turn on highlight shared electrons.…
Lewis Diagram: \( :\!F - F:\) (where each \(F\) has three pairs of dots around it representing the lone pairs)
-
the lady, or the tiger? by frank r stockton when all the people had ass…
C. by emphasizing the absolute nature of the king’s authority to punish and reward his subjects
-
read the lines from act ii, scene ii of romeo and juliet. juliet: o rom…
hopefulness and longing.
-
select the choice that best answers the following question. which of th…
B. Durable work gloves protect against electrical hazards
-
cohesion between molecules at the surface of a liquid is called surface…
Only the statement "Water molecules on the surface are pulled downward by the molecules below" is true.
-
mr. glancy general chemistry time left 0:36.12 question 5 not complete …
lower
-
select the choice that best completes the following statement. toxic va…
A. Chemical hazards
-
select the choice that best completes the following statement. the glov…
C. Thick rubber and plastic gloves
-
small business basics summer edition custodial staff you are starting y…
common areas of training for custodians
-
select the choice that best answers the following question. which of th…
A. Extremely low temperatures
-
select the choice that best completes the following statement. the glov…
C. Thick rubber and plastic gloves
-
select the choice that best answers the following question. which of th…
C. They are insulated and protect against electric hazards
-
select the choice that best completes the following statement. asbestos…
C. Harmful dust hazard
-
select the choice that best answers the following question. which kind …
d) Insulating rubber gloves
-
select the choice that best completes the following statement. overshoe…
B. Foot impact hazards
-
select the choice that best completes the following statement. electric…
B. Are insulated and protect against electric hazards
-
select the choice that best answers the following question. which kind …
d) Insulating rubber gloves
-
select the choice that best answers the following question. which type …
B. Harmful dust hazard
-
match the tools or methods with the descriptions. 5.7)____tongs/fingers…
5.7: C. These can be used to pick out things in a mixture. 5.8: B. When a mixture is placed in water, some things will float and others will sink. 5.9: E. Use these to separate ce…
-
the cost for 10 ounces of organiz bluebermes is $2.70. which equation c…
$\frac{2.7}{10}=\frac{x}{30}$ (the second option from the left)
-
5.4what is a physical property of iron filings?a. iron filings are magn…
5.4: A. Iron filings are magnetic. 5.9: C. The physical proprieties of both sand and water remain the same.
-
5.4) what is a physical property of iron filings? a. iron filings are m…
A. Iron filings are magnetic. ### 5.5
-
choose the best answers. 5.1) ____ a mixture is the __ of two or more t…
5.1) A. union 5.2) D. water 5.3) C. Mixtures maintain the physical properties of their substances.
-
select the best choice for the following statement. multi - purpose or …
A. Use nitrogen to dispel fire - retardant powder
-
select the choice that answers the question correctly. when oxygen reac…
d) Combustion
-
which act regulates the chemicals used in mining and elsewhere? clean w…
Toxic Substance Control Act
-
poetic devices pre-assessment directions: try your best to answer these…
Personification - e, Simile - i, Hyperbole - b, Onomatopoeia - f, Alliteration - c, Repetition - g, Stanza - d, Free Verse - h, Metaphor - a
-
select the best choice for the following statement. multi - purpose or …
d) All of the above
-
what makes mountaintop removal a controversial mining method? it only p…
B. It blows off the top of mountains and lets debris fall into valleys.
-
which chemical formula represents a polyatomic ion? (1 o nacl o na+ o c…
\(ClO^{-}\)
-
which quantity determines how two atoms bond? (1 point) o the differenc…
the difference in their electronegativities
-
select the choice that best completes the following statement. class c …
B. Water
-
select the choice that best completes the following statement. chemical…
C. Using non - sparking tools in explosive environments
-
how would the electron configuration of nitrogen change to make a stabl…
B. It would gain three electrons
-
a scientist studies the following chemical equation for the production …
C. mass of oxygen decreases
-
which statement names characteristics of a mineral? it must be crystall…
It must be crystalline and have a definite chemical composition.
-
the first ionization energy, e, of a boron atom is 8.01 x 10² kj/mol. w…
\(149\space nm\)
-
21. which of the following should be ensured by a cosmetologist when pe…
21. C. The skin should be soft and supple and have no signs of dehydration or flaking. 22. B. poor blood circulation 23. C. Do you take medication for diabetes, high blood pressur…
-
what is the first step in ipm? monitoring and assessing pest levels era…
monitoring and assessing pest levels
-
summarize it 1. how does the motion of molecules in solids relate to th…
1. D. Molecules involved in conduction vibrate in place due to high amounts of thermal energy, transferring it to less active molecules nearby. 2. A. Thermal energy transfers from…
-
answer choices: ride support beam electrical wire seat cushion circuit …
- Nonmetal: Seat cushion - Metal: Ride support beam, Electrical wire - Metalloid: Circuit board chip
-
1.2.7 quiz: analyze the declaration question 9 of 10 which of these use…
D. We are starving because the food, if you can call this slop "food," at our school is not fit for the lowest grub on this fine Earth!
-
question 5 which element is a metalloid used in electronic ride control…
Question 5: Silicon Question 6: Brittle and non - conductive
-
they only exist in labs question 4 according to the passage, why do eng…
To find materials with the right properties
-
23. calculate the value of \\( \\delta h^{\\circ}_{rxn} \\) (in kj) for…
B. -1124 kJ
-
question 3 what makes metalloids different from metals and nonmetals? t…
They have both metal and nonmetal properties.
-
they are soft and bend easily question 2 why are nonmetals helpful in r…
They are flexible, soft, and insulating
-
what is the parent isotope in this equation? carbon - 14 carbon - 12 ni…
Carbon - 14
-
match the type of energy to its description. electrical energy a type o…
- Electrical Energy: A type of energy involving charged particles - Mechanical Energy: Energy of motion - Chemical Energy: A type of energy involving the bonding of atoms - Gravit…
-
answer choices: drag the answer choices to the correct category over he…
- Atomic Number: Number of protons in the atom's nucleus - Element Symbol: One or two letters that represent the element - Atomic Mass: The combined number of protons and neutrons
-
isotopes become unstable when... the attraction of protons for neutrons…
the attraction of protons for neutrons is equal.
-
what is the first step in ipm? applying chemical pesticides monitoring …
monitoring and assessing pest levels
-
22. to which one of the following reactions occurring at 25°c does the …
B. $\frac{1}{2}H_2(g)+\frac{1}{2}N_2(g)+\frac{3}{2}O_2(g)\to HNO_3(aq)$
-
question 9 which element is identified by the symbol \fe\ and atomic nu…
B. Iron
-
the number of neutrons the group number question 8 what information can…
The total number of protons and neutrons in the atom
-
chemicals should be the last resort. the first step in ipm is monitorin…
to reduce pest damage to an acceptable level
-
the ________ states that single electrons with the same spin must occup…
Hund's rule