Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
-
in the spectrophotometry lab experiment, you calibrated a spectrophotom…
Solutions with higher concentrations have lower absorbances, while more dilute solutions have higher absorbances.
-
ws: molecular and empirical formulas write the molecular formulas of th…
s: 1) Molecular Formula: \( \boldsymbol{C_4H_8O_2} \) (or \( C_4O_2H_8 \)) 2) Molecular Formula: \( \boldsymbol{C_6H_{12}O_3} \) (assuming empirical \( C_2H_4O \)) 3) Molecular Fo…
-
use with textbook pages 256-267. types of chemical reactions—word equat…
1. S; $\ce{Mg + S -> MgS}$ 2. N; $\ce{2KOH + H2SO4 -> 2H2O + K2SO4}$ 3. SR; $\ce{Cl2 + 2KI -> 2KCl + I2}$ 4. DR; $\ce{AlCl3 + 3NaOH -> Al(OH)3↓ + 3NaCl}$ 5. D; $\ce{2PbO -> 2Pb + …
-
using the calibration curve, calculate the molar concentration for a so…
The molar concentration is approximately \(\boldsymbol{0.519}\) M.
-
what element is designated by the orbital diagram below? (note that cor…
Nickel (Ni)
-
which electron configuration violates hunds rule? answer: a $\\text{he}…
D. $[\text{He}]2\text{s}^22\text{p}_x^22\text{p}_y^2$
-
use the calibration curve to answer the following questions. part: 0 / …
y - axis ### For the second question (Is concentration graphed on the x - axis or the y - axis?):
-
decide whether each sketch shows a sample of an element, a compound, or…
s: - Substance Z: element - Substance X: compound - Substance T: mixture - Substance Y: mixture
-
the mechanism used by a person to vape or inhale flavors, chemicals, or…
A. NDS - E-Cigarette
-
empirical formula & molecular formula ws remember: percent to mass, mas…
The empirical formula is \( \boldsymbol{C_3H_6O_2} \) (Wait, wait, let's check the calculations again. Wait, maybe I made a mistake in the oxygen mass. Wait, 100 - 48.38 - 8.12 = …
-
experiment: measurements post lab questions 1) perform the indicated ma…
### Question 1: Mathematical Operations with Uncertainty #### Part 1: \( 7.700 \times 2.1 \) # Explanation: ## Step 1: Perform the multiplication \( 7.700 \times 2.1 = 16.17 \) ##…
-
empirical formula & molecular formula ws remember: percent to mass, mas…
The empirical formula is \( \text{C}_3\text{H}_6\text{O}_2 \)
-
problem 9 of 56 what element is designated by the orbital diagram below…
Nitrogen (N)
-
empirical formula & molecular formula ws remember: percent to mass, mas…
$\ce{C3H6O2}$ ### Problem 2
-
empirical formula & molecular formula ws remember: percent to mass, mas…
\(C_3H_6O_2\) ### Problem 2
-
there are four substances (substance a, substance b, substance c, subst…
To solve this, we analyze each substance: ### Substance B - **Step 1: Identify particle type** Substance B has only one type of atom (silver - colored spheres) and each particle i…
-
find the percent compositions of all of the elements in the following c…
s: 1) $Cu$: $\approx 28.45\%$, $Br$: $\approx 71.55\%$ 2) $Na$: $\approx 57.48\%$, $O$: $40.00\%$, $H$: $\approx 2.52\%$ 3) $N$: $\approx 41.11\%$, $H$: $\approx 11.83\%$, $S$: $\…
-
question: why is the average atomic mass on the periodic table often a …
A. Because it is a weighted average of all naturally occurring isotopes
-
question. can you measure the mass of a single atom with a normal labor…
D. No, atoms are too small to weigh individually with standard lab equipment
-
question: what happens to the average atomic mass when the number of he…
B. It increases
-
question 7 how does the simulation model average atomic mass? ○ it show…
C. It allows users to change the number of isotopes and measure their masses
-
question # 6 by krystal wellmann in the boron simulation, if there are …
78%
-
loudon | parise seventh edition consider the incomplete structure. add …
-1 (corresponding to the option $\boldsymbol{-1}$) The formal charge on the oxygen atom is $-1$, and all other atoms have a formal charge of $0$.
-
the skeleton of the bicarbonate ion, hco₃⁻, is shown here. draw the com…
The correct Lewis structure is: ``` .. O = C - O⁻ | .. O-H .. ``` (Or with spatial arrangement: Carbon is central, double-bonded to one O (with 2 lone pairs), single-bonded to one…
-
question. what are the two isotopes used in the boron simulation? boron…
A. Boron - 10 and Boron - 11
-
question: which formula correctly calculates average atomic mass? (abun…
(abundance × mass) for each isotope, then add them together
-
why must we use percent abundance when calculating average atomic mass?…
C. To give more influence to isotopes that occur more frequently
-
question. what is average atomic mass? the number of protons in the mos…
C. The weighted average of all isotopes of an element based on their percent abundance
-
which statement is the best example of a valid hypothesis? people shoul…
B. If I add substance X, then it will lower the temperature at which water freezes.
-
which chemistry advancement has made the greatest impact on human lives…
B. genetically modified crops increasing the food supply
-
in a sample of hydrogen iodide, what intermolecular forces exist in add…
dipole - dipole forces (the option with "dipole - dipole forces")
-
calculate the amount of heat needed to boil 15.5 g of methanol (ch₃oh).…
17.03 kJ (Option: 17.03 kJ)
-
determine the phase change that carbon dioxide undergoes as temperature…
sublimation
-
multiple choice which term best describes the contemporary public view …
ambivalent
-
which of the following pure substances has the strongest dispersion for…
\(C_8H_{18}\)
-
the intermolecular interactions between pentane ($c_5h_{12}$) molecules…
London dispersion forces.
-
question #5 multiple choice how does todays food market compare to the …
A. Today's food market is dominated by chain stores.
-
which of the following pairs of compounds does not have the one of high…
HCl, H₂S
-
which of the following pairs of compounds does not have the one of high…
# Brief Explanations: 1. For \( \ce{MgO} \) and \( \ce{NaCl} \): Both are ionic compounds. Lattice energy depends on ion charge and size. \( \ce{Mg^{2+}} \) and \( \ce{O^{2-}} \) …
-
what kind of intermolecular forces act between a hydrogen molecule and …
D. Dispersion forces
-
which of the following will not participate in hydrogen bonding?\ \\(\\…
\( \boldsymbol{\text{CH}_3\text{F}} \) (the option with \( \text{CH}_3\text{F} \))
-
which substance will exhibit hydrogen bonding between molecules? ○ $\\c…
\( \boldsymbol{\text{CH}_3\text{CH}_2\text{-OH}} \) (the option with the structure \( \text{CH}_3\text{CH}_2\text{-OH} \))
-
whats the best definition of chemistry? the study of matter and the cha…
A. The study of matter and the changes it undergoes ### Question 2
-
which sentence uses this meaning of vacuum? vacuum noun a space that is…
The chemist pumped the air out of the small glass chamber and turned it into a vacuum.
-
name class date determine what is happening in each picture and write w…
1a. An ice cube melts in water 1b. Physical Change --- 2a. Two clear liquids form a solid precipitate 2b. Chemical Change --- 3a. A white powder dissolves in a clear liquid 3b. Ph…
-
classifying matter practice directions: label each picture with a label…
1. 2) Compound 2. 3) Mixture of Elements 3. 5) A mix of elements and compounds 4. 5) A mix of elements and compounds 5. 1) Element 6. 4) Mixture of Compounds 7. 3) Mixture of Elem…
-
select the correct answer. a chemist is performing an experiment by obs…
D. from hour 0 to hour 5
-
can you explain it? how could the water in a dinosaur’s drink end up in…
1. The water likely went through the water cycle: it evaporated from a large water body into vapor, condensed into clouds, fell as precipitation, entered a water source (reservoir…
-
is the phrase in bold a direct object, an indirect object, or neither? …
neither
-
2. methanol (ch₃oh) molecules experience hydrogen bonding. which of the…
b. only y
-
stearic acid oleic acid complete the table. \tstearin\ttriolein is like…
| | stearin | triolein | | --- | --- | --- | | is likely liquid at room temperature | | $\boldsymbol{\checkmark}$ | | is a saturated fat | $\boldsymbol{\checkmark}$ | | | is likel…
-
the model shows the chemical structure of a steroid. steroids have carb…
- Steroids have carbon atoms arranged in rings. - Steroids help regulate growth in the body.
-
there are three sets of sketches below, showing the same pure molecular…
To solve this, we analyze the states of water at each temperature using its melting (0.0 °C) and boiling (100.0 °C) points: ### For Set A (246 °C): 246 °C is **above the boiling p…
-
directions: please answer each fill in the blank with the best answer. …
positive ### Question 2
-
11. ____ag₂o (s) ____ag + ____o₂ 12. ____s (s) + ____o₂ (g) → ____so₃ 1…
11. $2\text{Ag}_2\text{O}(s) ightarrow 4\text{Ag} + \text{O}_2$ 12. $\text{S}(s) + \text{O}_2(g) ightarrow \text{SO}_2$ 13. $\text{N}_2\text{O}_5(g) + \text{H}_2\text{O}(l) ightar…
-
Question was provided via image upload.
5. $2\text{HgO} ightarrow 2\text{Hg} + \boldsymbol{1}\text{O}_2$ 6. $\boldsymbol{1}\text{Ca} + 2\text{H}_2\text{O} ightarrow \boldsymbol{1}\text{Ca(OH)}_2 + 2\text{H}_2$ 7. $2\tex…
-
cleaning chemicals are generally not health hazards true false
False
-
Question was provided via image upload.
1 $H_2$ + 1 $Cl_2$ → 2 $HCl$
-
balance the chemical equation using the smallest possible whole number …
$2\text{HI}_{(g)} ightarrow \text{H}_{2(g)} + \text{I}_{2(g)}$
-
al₂(co₃)₃ 5. how many atoms of oxygen are in the compound above? 6. how…
9 ### Question 6
-
in which orbitals would the valence electrons for selenium (se) be plac…
s orbital and p orbital
-
which best explains why ionization energy tends to decrease from the to…
D. Electrons get farther from the nucleus. (Note: Assuming the options are labeled A - D as per typical multiple - choice, with the last option being the correct one. If the origi…
-
which statement best describes how electrons fill orbitals in the perio…
A. Electrons fill orbitals in order of their increasing energy from left to right.
-
the elements of which group are nonreactive? ○ halogens ○ alkaline eart…
C. noble gases
-
which element is classified as an alkali metal? ○ rb ○ sr ○ zr ○ cl
A. Rb
-
which substance is a mixture? ○ table salt ○ gasoline ○ aluminum ○ carb…
B. gasoline
-
iron, an element with the chemical symbol fe, is an important element. …
B. The electrons of iron have probable locations in a region of space around the nucleus.
-
when electrons are removed from the outermost shell of a calcium atom, …
D. a cation that has a smaller radius than the atom. (Note: Assuming the options are labeled A - D in the order given, with the last option being the correct one.)
-
which element is the most reactive? ○ sodium ○ nickel ○ carbon ○ oxygen
A. sodium
-
how many valence electrons does aluminum (al) have available for bondin…
3 (corresponding to the option "3")
-
which of the following symbols would be included in the noble gas notat…
B. Kr
-
which physical method can be used for obtaining a sample of salt from a…
A. boiling
-
volume and density worksheet name: date: class period: instructions: 1.…
56 ### Problem 2
-
part 1: introduction to polyatomic ions (table partner - 7 min. group p…
No. Oxygen needs an octet (8 valence electrons) and has 6 (or 7 in the shared case), while Hydrogen needs a duet (2 valence electrons) and has 1 (or 2 in the shared case, but O is…
-
drag each tile to the correct box. complete each analogy with the appro…
Wood is to fire as food is to subsistence. Grinning is to cheerful as teetering is to precarious. Conniving is to scheming as terrible is to abysmal. Mournful is to sad as glutton…
-
16. the fuel tank of an airplane has a device that measures the fuels t…
b. The molecules started moving slower.
-
balance the chemical equation using the smallest possible whole number …
$\boldsymbol{8}$ Fe$_{(s)}$ + $\boldsymbol{1}$ S$_{8(s)}$ $ ightarrow$ $\boldsymbol{8}$ FeS$_{(s)}$
-
balance the chemical equation using the smallest possible whole number …
$\boldsymbol{8}$ Fe$_{(s)}$ + $\boldsymbol{1}$ S$_{8(s)}$ $ ightarrow$ $\boldsymbol{8}$ FeS$_{(s)}$
-
balance the chemical equation using the smallest possible whole number …
$\boldsymbol{8}$ Fe$_{(s)}$ + $\boldsymbol{1}$ S$_{8(s)}$ $ ightarrow$ $\boldsymbol{8}$ FeS$_{(s)}$
-
balance the chemical equation using the smallest possible whole number …
(blank) $\text{CO}_{(g)} +$ (blank) $\text{Cl}_{2\ (g)} ightarrow$ (blank) $\text{COCl}_{2\ (g)}$
-
balance the chemical equation using the smallest possible whole number …
$\boldsymbol{CO_{(g)} + Cl_{2(g)} \longrightarrow COCl_{2(g)}}$ (los coeficientes son 1, 1 y 1, por lo que se dejan los espacios en blanco)
-
balance the chemical equation using the smallest possible whole number …
$\text{Na}_2\text{S}_{(aq)} + \text{FeCl}_{2(aq)} \longrightarrow 2\text{NaCl}_{(aq)} + \text{FeS}_{(s)}$ (Coeficientes en orden: 1 (vacío), 1 (vacío), 2, 1 (vacío))
-
balance the chemical equation using the smallest possible whole number …
First blank (B): 2 Second blank (H₂): 3 Third blank (B₂H₆): (blank, or 1) Balanced equation: $\boldsymbol{2\ \text{B}_{(s)} + 3\ \text{H}_{2(g)} ightarrow \text{B}_2\text{H}_{6(g)…
-
what do these two changes have in common? snowflakes forming in a cloud…
- Both conserve mass. - Both are only physical changes.
-
what do these two changes have in common? rust forming on a metal gate …
- Both are chemical changes.
-
what do these two changes have in common? water boiling on a stove your…
- Both are only physical changes.
-
what do these two changes have in common? newly poured concrete becomin…
- Both conserve mass. - Both are changes of state.
-
8. which graph best shows the general relationship between the temperat…
a. Graph 1
-
what happens to the molecules in a gas as it is cooled inside a jar? a.…
A. The molecules move more slowly.
-
chemistry was my favorite subject, but my teacher was extremely monoton…
D. tedious
-
4. lily is doing a science experiment with a substance in a sealed jar.…
b. faster, and the substance will be a gas.
-
tableau des résultats : | substances | solute (masse, g ± 0.01) | tempé…
### Résultats corrigés : 1. **NaOH** - $Q_{eau}=1927,4\ \text{J}$ - $\Delta H_{rx}=-1,93\ \text{kJ}$ - $n=0,0485\ \text{mol}$ - $\Delta H_{mol}\approx-39,7\ \frac{\text{kJ}}{\text…
-
phase changes and chemical reactions worksheet part 1: defining the bas…
1. False 2. A phase change is a physical change that only alters the state of matter without forming new substances, while a chemical reaction breaks and forms chemical bonds to c…
-
question 1 (1 point) which concept describes the movement of large sect…
d. Plate tectonics ### Question 2
-
unit 7 - moles calculate the number of moles in each of the following m…
Approximately $28.1\ \text{g}$ (or $28.05\ \text{g}$) ### Question 7
-
practice: moles to mass & mass to moles calculate the mass of each of t…
Approximately \( 2.38 \, \text{mol} \) (or \( \frac{64.1}{26.98} \approx 2.376 \), rounded as needed) ### Problem 17:
-
9. zinc (zn) is used to form a corrosion-inhibiting surface on galvaniz…
A. \( 1.51 \times 10^{24} \) atoms
-
8. how many molecules are in 3.50 mol of sucrose? (0.5 points) * 3.11 x…
2.11 x 10²⁴ molecules (the option with this value)
-
7. challenge: calculate the number of oxygen atoms in 5.00 mol of oxyge…
6.022 x 10²⁴ atoms (the option with this value)
-
6. arrange these three samples from smallest to largest in terms of num…
\(6.78 \times 10^{22}\) molecules glucose, \(2.14 \times 10^{24}\) atoms Fe, \(1.25 \times 10^{25}\) atoms Zn