Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
-
a local business supplies firewood to its customers. this business peri…
$C_{6}H_{10}O_{5}+6O_{2} ightarrow6CO_{2}+5H_{2}O$
-
choose the correct answer where are electrons located in an atom? outsi…
outside the nucleus
-
which of these is found in the nucleus of an atom? electron protons + n…
protons + neutrons
-
iron (fe) reacts with oxygen (o₂) in the air to form rust, fe(s) + o₂(g…
B. reactants
-
15. the nucleus of isotope a of an element has a larger mass than isoto…
C. the same as ### 16.
-
questions: 1. electrons located in the outermost shell of the electron …
1. En orbitales en la capa externa de la nube electrónica. 2. El neutrón. 3. Protones y neutrones. 4. En orbitales siguiendo reglas de mecánica cuántica.
-
what are biogeochemical cycles responsible for? ensuring efficient recy…
ensuring efficient recycling in nature
-
question 6 of 17 leading zeros are always significant. true false
False
-
24. which of these facts is supporting evidence that the universe is ex…
The galaxies are moving away from each other.
-
acidity changes after dry ice is added what happens to the acidity of s…
The pH of solution A decreases, and the pH of solution B decreases.
-
particles atoms 0.02×10²³ 1 mol calculate the number of moles in 36 gra…
$2\ mol$
-
choose the correct answer. why does water vapor condense at higher elev…
due to cooler temperatures
-
when methane (ch₄) is burned in the presence of oxygen (o₂), which prod…
d. Carbon dioxide and water
-
source: camlyn williams, \a natural label on food means next to nothing…
Yes, because it fails to use quotation marks and fails to cite the source.
-
calculate the answer to the question and put that answer in the blank. …
**20.8 g/mL**
-
which cannot be considered supported by modern understanding of the boh…
The electron orbits are easily distinguished from one another.
-
granite and rhyolite are chemically the same but where they crystallize…
1. a. True 2. a. True 3. a. True 4. b. False 5. b. False 6. b. False 7. b. False 8. a. True
-
when zinc is placed in a copper sulfate solution, zinc displaces to for…
copper
-
when sodium chloride reacts with silver nitrate, sodium nitrate and sil…
chloride
-
question 13 4 pts a tall glass graduated cylinder contains four separat…
II, I, IV, III
-
the density of gold is 19.3 g/cm³. what is the volume of a 13 g gold nu…
$0.67\ cm^{3}$
-
question 16 4 pts what is the mass of 225 ml of a liquid that has a den…
198 g
-
the decomposition of water into hydrogen and oxygen gas is an example o…
decomposition
-
question 18 4 pts a nugget of gold with a mass of 521 g is added to 50.…
19.3 g/mL
-
question 19 4 pts which of the following is not an element? water tin g…
water
-
which of the following is a heterogeneous mixture? noodle soup water te…
noodle soup
-
question 21 which of the following is an example of a physical change? …
grinding coffee beans
-
the formation of water from hydrogen and oxygen is an example of a reac…
synthesis
-
question 23 when a solid is converted directly to a gas, the change of …
sublimation
-
why do dark - colored objects absorb radiant energy faster than light -…
Dark surfaces have more energy - absorbing electrons.
-
the chart lists four different kinds of atoms. different kinds of atoms…
They cannot be divided and still keep the properties of the element.
-
which describes a feature of the physical changes of all substances? ca…
does not change the identity of a substance
-
multiple - choice question electron orbitals are always in the shape of…
false
-
1) calculate the number of grams of cucl₂·2h₂o needed to prepare 50 ml …
$1.28\ g$
-
6. compare oxygen (o) to selenium (se), choose the most accurate statem…
C. Oxygen has a lower ionization energy because it has a greater shielding effect.
-
5. which of these elements has the larger atomic radii and why? a. f is…
D. Cl is the largest because it has the least amount of shielding effect. (Note: This option seems to have an incorrect reasoning as Cl has more shielding effect due to more energ…
-
1. someone is cooking bacon in your home kitchen, but you can smell it …
Bacon particles are moving from high concentration (in the kitchen) to low concentration (the rest of the house)
-
chapter 1: lesson 3 periodic table: metal: ductility: malleability: non…
Periodic table: A tabular display of chemical elements arranged by atomic number, electron configuration, and recurring chemical properties. Metal: An element that is typically a …
-
4. which of these elements has the larger atomic radii and why? a. calc…
A. Calcium has a larger atomic radius than bromine because the nucleus of calcium has a weaker pull on its electrons compared to the nucleus of bromine.
-
which element is correctly labelled below? element a alkaline earth met…
C. element C
-
107. a chemist determines the constant s for a particular solution. he …
C. When $p = 1$ and $t eq0$ (closest option is C where $p = 1$ is given, though $t = 0$ in C makes the formula undefined in a strict sense, but the numerator condition for zero f…
-
2. examine the periodic table below and determine the correct answer. i…
We need more information about the positions of these elements in the periodic table to determine which statements are true. Without specific group and period information for elem…
-
1. which statements about the development of the periodic table of elem…
1. False 2. True 3. False 4. True 5. True So the answer is C (2 and 4 are true)
-
ch 09 hair type and texture quiz question 12 of 12 1 point what is a qu…
It may be fragile and prone to frizz.
-
periodic trends quiz form b pd: 3rd name: cishna gaycta 1. which statem…
D) 1 and 2 are true
-
question 11 of 12 what is a quality of wavy coarse hair? select the cor…
It is prone to tangles and dryness.
-
properties of water crossword (version #1) across 2. process where wate…
Across 2: Evaporation Across 5: Surface - tension Across 7: Adhesion Across 8: Condensation Across 9: Hydrophilic Across 10: Solvent Down 1: Hydrogen - bond Down 3: Hydrophobic Do…
-
question 10 of 12 1 point what is a quality of coily afro - texture hai…
It may be fragile and prone to frizz.
-
name: cristina garcia pd: 5 1. which statements about the development o…
1. C 2. C 3. C
-
silvers atomic symbol (or abbreviation) is \ag.\ why does its atomic sy…
Because it is named after its Latin name, not its English name.
-
question 2 of 12 1 point what is a quality of curly coarse hair? select…
C. It is prone to tangles and dryness.
-
pregunta de opción múltiple silvers atomic symbol (or abbreviation) is …
Neither of the given options is correct. The atomic symbol "Ag" for silver is from its Latin name "argentum".
-
two atoms that have different numbers of protons are o different isotop…
B. Different elements
-
what type of atom is element c? c 12 protons 12 neutrons 11 electrons i…
A. Ion
-
what is the atomic number of this element? c 12 protons 12 neutrons 11 …
12
-
the defining trait of an element is its _______________, which is equal…
Atomic number
-
question 17 what does it change in an ion? the number of electrons the …
The number of electrons
-
stion 16 what type of atom is this? o normal atom o anion o cation o is…
Isotope
-
covalent bonding basics manipulatives directions: for each set of atoms…
Lewis - dot structure: H:Cl (with a single bond between them and 3 lone pairs on Cl) Ball - and - stick diagram: A single stick connecting a H ball and a Cl ball with 3 sets of 2 …
-
what type of atom is this? 24 2+ mg 12 anion isotope cation neutral atom
C. Cation
-
what type of atom is this?
A metal - ion (magnesium ion)
-
what charge does an atom have when it gains electrons? positive unpredi…
C. Negative
-
question 13 calcium has the atomic number 20. if it has a mass number o…
D. 26
-
when two atoms of the same element have different masses, they are call…
B. Isotopes; Neutrons
-
# protons ______ # neutrons ______ 82 pb lead 207
# protons: 82 # neutrons: 125
-
of most common isotope table will be an average of all isotopes) 79 au …
# protons: 79 # electrons: 79
-
how many neutrons are in the isotope pictured below? 63 29 cu
34
-
atomic number 1 h hydrogen 1 atomic mass
Atomic number: 1 Atomic mass: 1
-
employees exposed to hazardous chemicals must be trained in all these a…
There is no correct "except" option as all listed areas are necessary for training.
-
how do we determine if a reaction is at equilibrium? q = products/react…
15) The reaction - quotient, which is the ratio of the concentrations of products to reactants at a particular moment in the reaction. 16) C. The reaction is already in a dynamic …
-
in which workplaces are written hazard communication programs not requi…
Where employees deal with sealed containers
-
osha - required hazard communication training must include all of the f…
D. Chemical hazard cost analysis
-
81. if φ is defined such that aφb = b(a + b), what is the value of 5φ4?…
C. 36 ### 82.
-
use your carbon compounds: part 1 notes and the information provided be…
1. Carbon 2. Carbon (C), Hydrogen (H), Nitrogen (N), Oxygen (O), Phosphorus (P), Sulfur (S) 3. A substance consisting of two or more elements with a unique composition. Example: W…
-
82. hakim, lisa, and oscar all play instruments. hakim plays the same i…
D. None of the above must be true ### 83.
-
21) a catalyst usually lowers the energy required to initiate the react…
21) True 22) False 23) Hot water
-
17) what causes the interactions between gas particles? oa) ionic bonds…
17. D. Intermolecular forces 18. A. Low temperature, D. High pressure 19. A. There is no attraction between the molecules, C. Collisions between molecules are elastic, E. The mole…
-
what is the number of moles of gas contained in a 3.0l vessel at 300k w…
1. First problem: None of the given options are correct. 2. Second problem: A. $0.0069\ mol$ 3. Third problem: None of the given options are correct.
-
1. a 25.0 l tank contains hydrogen (h₂) gas at a temperature of 149 k a…
1. $3.09\ mol$ 2. C. L
-
81. if ★ is defined such that a★b = b(a + b), what is the value of 5★4?…
81. None of the options are correct with the correct calculation using \(a abla b=b(a + b)\) (if there is a mis - type in the options). 82. D. None of the above must be true.
-
worksheet nuclear radiation what is nuclear chemistry give three compar…
1. Nuclear chemistry is the study of nuclear processes and radioactive substances. 2. | Chemical reactions | Nuclear reactions | |--|--| | Small energy changes | Large energy chan…
-
ch 09 five elements of hair design quiz question 1 of 2 6 points fill i…
form, space, design texture, flat iron, relaxers, permanent waves
-
what is the process of sublimation? the electric company in your commun…
(12) The substance pulls energy from substances around it, which weakens the attraction between the particles in the solid. When the attraction weakens enough, the solid changes d…
-
identify the elements in the following equation. $_2^4he + _7^{14}n \to…
The elements are Helium (He), Nitrogen (N), Oxygen (O), and Hydrogen (H).
-
identify the elements in the following equation. $_2^4he + _7^{14}n \to…
The elements are helium ($\ce{He}$), nitrogen ($\ce{N}$), oxygen ($\ce{O}$), and hydrogen ($\ce{H}$).
-
what is the process of evaporation? when you get out of a swimming pool…
(6) Sweat is mostly water. When sweat appears on the skin, the water absorbs heat (energy) from the skin. This causes the water to evaporate, and the body feels cooler. (7) It wil…
-
name horon w esrare class 3chem date 9/18/25 section 3 changes of state…
(3) Energy (4) The temperature at which a substance changes from a solid to a liquid; it is a physical property that depends on the composition of the substance and can be used to…
-
what is the general ratio of protons to neutrons in stable isotopes of …
B. 1 : 1
-
name aaronaconeslac class 3rd chem date 9/18/25 chapter 3 states of mat…
1. Energy 2. The water in the puddle evaporates. The water molecules gain energy, move faster, and change from a liquid state to a gaseous state (water vapor) and rise into the ai…
-
what part of an atom is involved in chemical reactions? 250 words remai…
Electrons
-
4. in the simulator, experiment by adding each type of particle to your…
4. Protons 5. No 6. Yes 7. Protons and neutrons 8. Yes 9. 2 10. 5 11. 8 12. It becomes a negatively charged ion
-
what do the pair of symbols $_{92}^{235}u$ and $_{92}^{238}u$ represent…
C. isotopes
-
which of these is the correct nuclear notation of the isotope oxygen - …
B. $^{15}_{8}O$
-
5. how does the poems rhyme scheme contribute to the overall mood? the …
The consistent rhyming creates a calm and steady mood, reflecting the routine of daily life.
-
water can travel up a glass tube against the force of gravity! this is …
Adhesion; Cohesion; Adhesion and cohesion; Gravitational
-
water molecules are also attracted to other kinds of molecules. this is…
A concave meniscus forms in a glass column when adhesive forces between water and glass are stronger than cohesive forces between water molecules.
-
1 how does the poems division into three stanzas contribute to its over…
Each stanza uses a different rhyme - scheme to contrast emotions.
-
part 6. discussion and future work 1. a known characteristic of this pa…
1. Use a humidity - controlled chamber. 2. Different chemical compositions may affect paint properties. 3. Temperature, surface, and application method. 4. Optimal ratio, performa…
-
4. there are 40 liters of helium in a balloon at a temperature of 100 k…
80 L ### 15.
-
10) mark the following with p for pny. a. _p_ crumpled paper b. _c_ bur…
10) Physical changes (P): A, E, G; Chemical changes (C): B, F, D, H 11) Boiling Point, Density, Melting Point, Temperature 12) d. 15 g/mL 13) Homogeneous mixture: pure water, salt…