化学
化学反応、化学量論、分子構造、元素の性質。
-
11 i can calculate the partial pressure of a gas from moles, temperatur…
The partial pressure of oxygen gas is $\boxed{404}$ mm (assuming $P_{\text{H}_2} = 475$ mm; if $P_{\text{H}_2}$ is different, substitute the correct value in Step 3).
-
the total pressure of the gas mixture is 879 mm, using the partial pres…
Assuming Dalton's Law and \( P_{\text{H}_2} = 439.5 \) mm (from previous calculation), the partial pressure of \( \text{O}_2 \) is \( \boldsymbol{439.5} \) mm (or if the ratio is …
-
which type of compounds is carbon found in? options: ionic compounds, m…
C. Organic compounds, D. Inorganic compounds (Note: Carbon is found in both organic (e.g., hydrocarbons, sugars) and inorganic compounds (e.g., CO₂, Na₂CO₃). If we consider the mo…
-
8.give the symbol and number of electrons in a neutral atom of: uranium…
Uranium: U, 92 electrons Chlorine: Cl, 17 electrons Boron: B, 5 electrons Iodine: I, 53 electrons Antimony: Sb, 51 electrons Xenon: Xe, 54 electrons ### Question 9
-
atomic number quick check which statement describes the properties of l…
C. They are malleable and lustrous, and they tend to conduct both electricity and thermal energy.
-
use the periodic table to answer the question. in which group of elemen…
C. metalloids
-
atomic number quick check use the periodic table to answer the question…
phosphorus (P)
-
how does mercury differ from other metals? (1 point) it does not chemic…
B. It is not solid under normal conditions.
-
atomic number quick check an element is highly conductive, highly react…
A. alkali metals
-
critical thinking 5. applying concepts what happens to the volume of a …
The volume of the balloon decreases. This is explained by Charles's Law (at constant pressure, volume of a gas is directly proportional to its absolute temperature). When the ball…
-
which type of bond forms between water molecules? ○ capillary bond ○ hy…
B. hydrogen bond
-
laboratory simulation ch the papers to the most likely contents of each…
To solve this problem, we analyze the appearance of the papers and typical properties of substances (like water, alcohol, oil, etc.) that affect how they spread on paper: ### Pape…
-
across 5. a tool used to stir mixtures and such. 8. a tool used to meas…
This is a crossword puzzle related to laboratory safety and equipment, which falls under the Natural Science discipline, specifically Chemistry (since it involves lab procedures a…
-
which best explains the surface tension of water? ○ capillary action ○ …
B. cohesion
-
which example illustrates adhesion? ○ water droplets sticking to a wind…
A. water droplets sticking to a window
-
19 wearing sandals is appropriate attire for a science lab. a true b fa…
B. False ### Question 20:
-
17 in a science lab, it is safe to smell chemicals directly to identify…
B. False ### Question 18
-
important to tie back long hair in the science lab? a to keep it styled…
C. To prevent it from catching fire or dipping into chemicals. ### Question 15 (unsafe action with open flames in lab)
-
which statement explains why hydrogen bonds are able to form between wa…
A. Water molecules are polar.
-
a always wear safety goggles. b eat and drink in the lab. c ignore spil…
B. Tell the teacher immediately and rinse the area with plenty of water.
-
experimental design directions: drag each tile to the correct box. eddi…
To determine the correct order of steps for Eddie's experiment, we follow the scientific method: ### Step 1: Make a Prediction Before conducting the experiment, Eddie should hypot…
-
a robot spacecraft returned samples from the planetesimal 98765 aleks, …
The average atomic mass of ruthenium (Ru) for this sample is approximately $\boldsymbol{100.1}$ amu (rounded to the correct number of significant digits, or as calculated: $100.08…
-
shakita wants to know if the ph of an open can of soda changes over tim…
B. the pH of the soda
-
jay wants to know how the amount of acidity in rainwater influences the…
D. He can repeat his experiment multiple times and ask someone else to replicate his experiment.
-
what appears to be the trend in electronegativity as you move down a gr…
B. decreasing
-
using the mass and volume information, calculate the density of each ob…
$11.3\ \text{g/mL}$ #### Part (b)
-
what appears to be the trend in electronegativity as you move from left…
increasing
-
what appears to be the trend in first ionization energy as you move dow…
decreasing
-
what appears to be the trend in the first ionization energy as you move…
A. increasing
-
what appears to be the trend in atomic radius as you move down a group?…
A. increasing
-
what appears to be the tre... us as you move from left to right in a pe…
decreasing
-
from nature; addresses, and lectures 1. the first in time and the first…
4. Man desires to find the interrelation of elements in nature.
-
name: riley sanchez date: class period: unit: atomic structure “history…
The idea of the atom was first developed around 400 B.C. by the Greek philosopher Democritus. His theory proposed that matter consists of tiny, indivisible particles called atoms,…
-
complete the table below, using the diagram of an atom shown at right. …
| name | symbol | charge (in multiples of e) | approximate mass (amu) | location on diagram | |----------|--------|----------------------------|------------------------|----------…
-
bellringer 09/08 • unit 2: • nuclear processes whats the smallest part …
The smallest part of an element that still has the properties of that element is an atom. The three subatomic particles that make up an atom are protons, neutrons, and electrons.
-
product reactant based on the particle model, which part is favored at …
Reactant
-
calculate the temperature change that results from adding 250 j of ther…
To solve for the temperature change (\(\Delta T\)) when thermal energy (\(q\)) is added, we use the formula for molar heat capacity: \[ q = n \cdot C_m \cdot \Delta T \] Rearrangi…
-
how many valence electrons are in the bohr model below?
7
-
read these lines from \the monk’s tale.\ he had a son, belsazar was his…
D. abab
-
c. what group does the element o belong? group 16 12.) which of these e…
a. Li ### Question 13: Which of these elements has the lowest ionization energy? (Options: a. O, b. B, c. C, d. F)
-
question 7 (fill-in-the-blank worth 3 points) (01.02r lc) 25,000 cg is …
250
-
if you calculated 41.0 ÷ 0.302, how many significant figures would be i…
3
-
which of the following is a valid conversion factor? (\frac{1,000 \text…
\(\boldsymbol{\frac{1000\,\text{mL}}{1\,\text{L}}}\) (the first option)
-
does oxygen belong? group 2 c. what group does chlorine belong? group 1…
Group 17 (or VIIA) ### Question 7: Which of the following will have a larger radius than Zinc? (Options: Gallium, Aluminum, Magnesium, Strontium)
-
forms of energy practice directions: sort the following pictures into t…
To solve this, we analyze each image and assign to energy forms: ### Mechanical (motion/force): - A (biking), B (gears), H (scissors), L (drill), P (see-saw), S (car), V (stapler)…
-
name: ______ instruction: answer the following. please refer to your pe…
Cl ### 1. b.
-
molecules that result after a chemical reaction occurs are called multi…
A. products
-
if a ball begins to roll down an incline, its ________ is converted int…
C. potential energy; kinetic energy (assuming the third option is labeled C, with the text "potential energy; kinetic energy")
-
name instructions: answer the following. refer to your periodic table. …
a ### Question 8
-
fill in the blank question geologic and organic materials that store, o…
sinks
-
question 8 of 25 which of the following contains chemical energy? a. mo…
B. Food
-
what is the shape of the following molecular structure? trigonal pyrami…
Trigonal Pyramidal
-
what is the molecular geometry of bcl₃? tetrahedral trigonal pyramidal …
The molecular geometry of \( BCl_3 \) is trigonal planar. So the correct option is the one labeled "trigonal planar".
-
draw the lewis dot structure for sif₃. then carefully compare your draw…
The correct Lewis dot structure is the one on the purple card (second from the top, with Si bonded to three F atoms, 2 lone electrons on Si, and each F with three lone pairs).
-
h-c≡c-h(g) + 2hi(g) → product structure using the table of average bond…
\(-217 \, \text{kJ}\)
-
unit 2 hw, part 2: mcq. remember to log your responses on my ap. it doe…
D. There is ionic bonding between \( \text{Mg}^{2+} \) ions and \( \text{NO}_3^- \) ions. ### Question 2
-
what is the bond angle in the structure? (options: 180, 109.5, 120; ima…
109.5
-
what is the shape of the following molecular structure? options: trigon…
T - shape
-
what is the bond angle for scl₆? options: 109.5, 104.5, 90, 107, 120; i…
90 (corresponding to the option with value 90)
-
use the list to answer the question. - potassium, group ia - calcium, g…
D. potassium and iodine
-
hydrogen-hydrogen single bond/s are broken and —— carbon-hydrogen singl…
2; 8 (matching the teal option: 2; 8)
-
which information about an atom can a period number give you? (1 point)…
A. how many energy levels it has
-
which of the following illustrations shows a tetrahedral geometry?
The illustration with the yellow border (the top - most one) shows a tetrahedral geometry.
-
when moving across a period from left to right in the periodic table (e…
B. Valence electrons increase by one.
-
which method is not used to separate a mixture of sand, water, and salt…
D. Magnetic attraction
-
draw a lewis structure for carbonate, co₃²⁻. then carefully compare you…
The correct option is the green - colored one (the fourth option from the top) with the Lewis structure showing a carbon atom double - bonded to one oxygen (with 2 lone pairs), si…
-
based on the naming rules for ions, which of the following is a negativ…
D. chloride
-
after separating the sand, which method would you use to separate the s…
C. Evaporation
-
what is the shape of the following molecular structure? t-shape trigona…
Blue. Trigonal Pyramidal
-
which method would you use first to separate sand from a mixture of san…
B. Filtration
-
question 7 7/10 which of the following is an example of filtration? usi…
B. Separating noodles from water
-
6/10 what is the purpose of a filter in the filtration method? to magne…
D. To separate solids from liquids (assuming the options are labeled A - D with D being the last option "To separate solids from liquids")
-
in the example of separating salt from water using evaporation, what is…
D. Salt crystals
-
4/10 what happens to the liquid in the evaporation method? it turns int…
A. It turns into a gas
-
question 2 2/10 which tool is used in the sifting method? scroll more e…
B. Sieve (assuming the option with "Sieve" is labeled as B, following the order in the image where Sieve is the second option)
-
type the correct answer in the box. round your answer to the nearest th…
14.007
-
select all the correct locations on the image. in this diagram, which s…
The two blue particles labeled "E" (the electrons orbiting the nucleus).
-
1/10 what is the basis for choosing a method to separate a mixture? che…
4. Physical properties
-
the following electron configurations belong to which elements: 11) 1s²…
Sodium (Na) ### Question 12
-
7. check the box if the statement describes the atom model. proposed by…
ing (checking boxes): - For the first (plum - pudding) model: Check “negative electrons floating in a ‘soup’ of positively charged material” and “proposed by J. J. Thomson”. - For…
-
read the excerpt from ovid’s \pyramus and thisbe\, the blood leaped hig…
The figurative language describes the violence of the scene.
-
select all the correct images. select the atomic models that belong to …
The atomic models that belong to the same element are the top - right model (with 1 proton, 1 neutron, 1 electron) and the bottom - left model (with 1 proton, 2 neutrons, 1 electr…
-
5 type the correct answer in the box. calculate the density of the subs…
0.7
-
select the correct answer in an experiment, lydia added 50 grams of sug…
A. A physical change took place during this experiment.
-
select the correct answer. a student places a sample of white sodium bi…
D. It is not sodium bicarbonate.
-
e to the correct location. properties as intensive or extensive. mass d…
### Intensive Property: - density - color - freezing point ### Extensive Property: - mass - volume
-
chemical reactions that release energy are called ________ reactions. m…
C. exergonic (assuming the third option is labeled C, with the text "exergonic")
-
the original molecules that enter a chemical reaction are called multip…
B. reactants (assuming the second option is labeled B; if the options are labeled differently, adjust the label but the text is "reactants")
-
entropy is a measure of ______ in a closed system. multiple choice diso…
A. disorder
-
which choice identifies the correct limiting reactant and correct reaso…
O₂: because it has the lower theoretical yield
-
which choice identifies the correct limiting reactant and correct reaso…
O₂ because it has the lower theoretical yield
-
which choice identifies the correct limiting reactant and correct reaso…
C. NaCl because it has the lower theoretical yield (assuming the third option is labeled C; if the original options have different labels, adjust accordingly to match the option w…
-
which choice identifies the correct limiting reactant and correct reaso…
A. \( \text{H}_2 \) because it has the lower theoretical yield
-
which choice identifies the correct limiting reactant and correct reaso…
Mg because it has the lower theoretical yield
-
____ are the elements and compounds that go into a reaction. options (i…
Reactants
-
reactants products molecules — are the elements and compounds that are …
Products
-
the energy needed to start a reaction is called the promoting energy re…
D. activation energy (assuming the options are labeled A to D with A: promoting energy, B: reacting energy, C: starting energy, D: activation energy)
-
at the end of this reaction, has energy been released or absorbed? (pot…
Released
-
write the unabbreviated electron configurations of the following elemen…
\(1s^2 2s^2 2p^6 3s^2 3p^6 4s^1 3d^{10}\) ### 2) Iodine (I, atomic number 53)
-
science 8 - pd(a-r) - 26-26 readiness test: introduction to matter fill…
mixture