Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
-
which have different numbers of electrons? different ions of an element…
A. different ions of an element
-
who was the first chemist to organize elements by atomic number? johann…
C. Henry Moseley
-
which statement describes the location of most metalloids on the period…
B. The metalloids are located below nonmetals and above metals within a group.
-
calcium, magnesium, and strontium are near each other on the periodic t…
strontium, calcium, magnesium (the third option: strontium, calcium, magnesium)
-
bohr models: what can it tell us? electrons = small circles on the ring…
- Element Identity: protons = atomic number (e.g., Mg: 12 protons = atomic number 12) - Element Family: valence electrons = group number; 2 valence electrons = column 2 (alkaline …
-
11 choose the correct answer. _______ - expresses feelings with a patte…
B. lyric poem ### Question 12
-
which is the property of nonmetals to evaporate easily? ○ brittle ○ den…
D. volatile
-
the atomic number of beryllium (be) is 4, and the atomic number of bari…
B. They are in the same group because they have similar chemical properties, but they are in different periods because they have very different atomic numbers.
-
question 6 (1 point) retake question name the following: (chemical stru…
3 - butoxy - 4 - propylheptane (the third option: 3 - butoxy - 4 - propylheptane)
-
which element is a metalloid? ○ selenium (se) ○ germanium (ge) ○ phosph…
B. germanium (Ge)
-
which group contains the most reactive nonmetals? group ia group viia g…
B. Group VIIA
-
which groups on the periodic table contain metalloids? groups 1-2 group…
Groups 13 - 16
-
which statement describes a property that is unique to metalloids? meta…
Metalloids are semiconductive.
-
how is the atomic mass used to determine the most abundant isotopes mas…
B. Rounded to the nearest whole number (assuming the options are labeled as A: Exact measured value, B: Rounded to the nearest whole number, C: Lowest possible value, D: Average o…
-
why are noble gases generally unreactive? they have a high atomic mass;…
Green box: Their outer electron shell is full
-
which metalloid has three valence electrons? ○ boron ○ arsenic ○ silico…
A. boron
-
what does being a metalloid indicate about an elements properties? simi…
B. Mixed properties of metals and nonmetals (assuming the blue option is labeled B; if not, the option with text "Mixed properties of metals and nonmetals")
-
how does an elements charge change when it loses electrons? becomes neg…
Green. Becomes positive
-
what does the group number for representative elements indicate? number…
D. Number of valence electrons
-
how does the number of valence electrons in atoms of metalloids explain…
D. They have three to six valence electrons, so they can lose or gain electrons. (assuming the options are labeled A, B, C, D in order as presented)
-
what type of ion forms when a nonmetal gains electrons? positive ion ca…
D. Negative ion (assuming the options are labeled as A: Positive ion, B: Cation, C: Neutral atom, D: Negative ion; if the red option is labeled as D or is the fourth option, the c…
-
the davis family grows organic vegetables to sell at a local farmers ma…
- an increase in the cost of farm equipment - a rise in demand for organic produce - an increase in customers at the market
-
what does the period number indicate in an element’s electron cloud? nu…
D. Number of energy levels (assuming the options are labeled A to D as: A. Number of protons, B. Number of valence electrons, C. Atomic mass, D. Number of energy levels)
-
which lists the elements in order from least conductive to most conduct…
nitrogen (N), antimony (Sb), bismuth (Bi)
-
for metalloids on the periodic table, how do the group number and the p…
A. The lower the group number, the lower the period numbers, so the metalloids are found in a diagonal moving down from left to right.
-
of these nonmetals, which one is likely to be the least reactive? oxyge…
B. sulfur (S)
-
where are the most reactive nonmetal elements found on the periodic tab…
A. at the top of group 17
-
which element has a complete valence electron shell? selenium (se) oxyg…
D. argon (Ar)
-
7. atom molecule element compound 8. atom molecule element compound 9. …
### Problem 7: Atom: 4, Molecule: 2, Element: 2, Compound: 0 ### Problem 8: Atom: 1, Molecule: 0, Element: 1, Compound: 0 ### Problem 9: Atom: 9, Molecule: 3, Element: 0, Compound…
-
looking at the same nonmetal group on the periodic table, how does the …
The period 2 element would be more reactive because the attractive force of protons is stronger when electrons are attracted to a closer electron shell.
-
what is the most likely reason that nonmetals are electrical insulators…
B. Since valence shells in nonmetal atoms are almost full, the atoms attract electrons and hold them tightly to fill their valence shells.
-
which statement best explains why radon and krypton do not bond easily …
They have eight electrons in their valence shells, so they are stable without gaining or losing electrons.
-
enq, a chemist, is running tests with four unknown elements. he has fou…
17
-
which element is likely to be the most reactive? bromine (br) chlorine …
C. fluorine (F)
-
what property do all of the group 18 elements have that makes them stan…
D. They are very unlikely to bond with any element, whether it is metallic or not.
-
krypton is named after the greek word that means \secret.\ which explai…
C. Krypton is a noble gas, so it was difficult for chemists to find it, as though it was a secret.
-
the most reactive metals are located in which area of the periodic tabl…
B. far left
-
elements are organized on the periodic table based on their properties.…
Lithium (Li) is less reactive than potassium (K) because the valence electrons in lithium atoms are closer to the nuclei and harder to remove.
-
an atom of element x has one more shell of electrons than an atom of be…
A. sodium (Na)
-
atoms of elements at the top of a group on the periodic table are small…
The valence electrons of the larger atoms are farther from the nucleus and are easier to remove, so the metals near the bottom are more reactive than those at the top.
-
which element is most likely to bend without breaking? ○ carbon (c) ○ i…
D. cobalt (Co)
-
based on its location on the periodic table, which metal is likely to b…
A. potassium (K)
-
which statement correctly compares an atom of an alkali metal with an a…
The alkali metal atom forms a +1 ion, while the alkaline earth metal atom forms a +2 ion.
-
based on the information in the table, which two elements are most like…
bismuth and nitrogen, because they have the same number of valence electrons
-
in an elements square on the periodic table, the number with the greate…
D. atomic mass
-
this is how krypton appears in the periodic table. 36 kr krypton 83 80 …
A. 36
-
which two chemists organized elements based on properties such as how t…
D. Lavoisier and Dobereiner
-
elements in group 2 are all called alkaline earth metals. what is most …
which chemical properties they have
-
while developing his periodic table, dmitri mendeleev broke his own rul…
A. Mendeleev observed that tellurium has chemical properties like other elements in its group, and he did not know that neutrons cause the greater atomic mass.
-
dmitri mendeleev and henry moseley developed their periodic tables abou…
The number of protons in an atom is different than the atom’s total mass.
-
if we have a sample of silicon (si) atoms that has 14 protons, 14 elect…
B. silicon - 32
-
what is the molar mass of $\\ce{c_{5}h_{10}n_{2}o_{3}}$ show your work …
The molar mass of \( C_5H_{10}N_2O_3 \) is approximately \( 146.15 \) g/mol (or more precisely, using more accurate atomic masses, it can be calculated as well, but this is a stan…
-
what is the molar mass of $\\ce{c_{5}h_{10}n_{2}o_{3}}$ show your work
The molar mass of \( \text{C}_5\text{H}_{10}\text{N}_2\text{O}_3 \) is \( 146.15 \) g/mol.
-
ess investigation — the ripple effect, student answer packet 2 7. other…
One unique physical property of water that contributes to rock weathering is its **expansion upon freezing** (frost wedging). When water infiltrates cracks in rocks (e.g., in the …
-
which are different forms of an element that have different numbers of …
B. isotopes
-
7 other than the variables that could have been investigated in investi…
One unique property of water contributing to rock weathering is its ability to chemically dissolve minerals (e.g., via carbonation: water combines with carbon dioxide to form carb…
-
the chemical symbol for the element calcium is ca. what would be the sy…
\( \text{Ca}^{+2} \) (the option with \( \text{Ca}^{+2} \))
-
the simple model below is a neutral magnesium (mg) atom with the elemen…
It must lose two electrons and become an ion.
-
the model below shows a calcium atom. how many electrons are in the thi…
8 (corresponding to the option with 8, e.g., if the options are labeled as: ○ 2, ○ 8, ○ 18, ○ 20, then the answer is the option with 8, so "8 (the option with 8, e.g., the second …
-
one isotope of sodium has 11 protons and 7 neutrons. what is the mass n…
18 (corresponding to the option "18")
-
all atoms of the element potassium have 19 protons. one of the most sta…
20 (corresponding to the option "20")
-
7. place the following layers in order from most dense to least dense: …
inner core, outer core, mantle, lithosphere, asthenosphere, crust ### Question 8:
-
7. place the following layers in order from most dense to least dense: …
inner core, outer core, mantle, asthenosphere, lithosphere, crust ### Question 8:
-
5. which of the following most likely causes earth’s inner core to be a…
a. The pressure in the core is very high ### Question 6
-
a molecule is a particle made up of a group of atoms. in water, each mo…
A. various types of chemical bonds in molecules
-
describing properties of thermal energy transfer based on what you have…
1. First blank: joule 2. Second blank: specific heat capacity 3. Third blank: gram (or kilogram) 4. Fourth blank: degree Celsius (or Kelvin) 5. Fifth blank: $\frac{\text{J}}{\text…
-
question 7 this article would be most useful as a source for a student …
D. potential threats to aquatic environments
-
question 6 based on the article, which of these is true about surface t…
A. It's the reason a drop of water has a spherical shape.
-
question 2 according to the article, what causes water molecules to joi…
B. The molecule has opposite charges on each end.
-
what is the ion that is formed from element 1? (include element symbol …
\( \text{H}^+ \)
-
question 1 the article primarily discusses __________. a. how some inse…
D. how some properties of water are determined by the shape of the molecule
-
question 10 10 pts the atomic arrangements of two substances (a and b) …
B. Substance B is a compound as the atoms can be separated only by chemical processes.
-
question 8 a teacher drew 3 figures on the board figure 1 figure 2 figu…
Figure 1: Element Figure 2: Compound Figure 3: Mixture
-
element 6: boron properties: - mostly dull, can be shiny - brittle soli…
The correct category for Boron is "Metalloid" (the written "Meta" is incorrect; it should be recognized as a metalloid based on its properties).
-
• a bag of white sugar • a bag of brown sugar • warm water • cold water…
A. Does white sugar dissolve more quickly in warm water or in cold water? B. Does white sugar dissolve in warm water more quickly than brown sugar does?
-
element 6: boron properties: - mostly dull, can be shiny - brittle soli…
Metalloid (Since Boron shows properties of both metals and non - metals: dull (non - metal - like) but can be shiny, brittle solid (non - metal - like), poor conductor at room tem…
-
69.residents in a long - term care facility have all of the following r…
d. Cannot voice grievances because of fear of retaliation ### Question 70
-
question 7 10 pts two elements (a and b) are combined in two different …
Substance X is a compound, and Substance Y is a mixture.
-
element 5: oxygen properties: - colorless gas - poor conductor - not ma…
Non - metal
-
· malleable & ductile · good conductor · solid at room temp category: m…
Non - metal
-
a student receives a beaker that contains sand, water, and salt mixed t…
The beaker originally contains a heterogeneous mixture, and after Step 1, it contains a homogenous mixture.
-
a teacher asks the students to classify the substances listed in the ta…
The student's claim is correct because the atoms in the substances are chemically combined to form a compound.
-
element 4: copper properties: - reddish - brown, lustrous - excellent c…
Metals
-
3. why does the spot need to be above the level of the solvent when the…
To prevent the ink spot from dissolving directly in the solvent reservoir; it allows the solvent to move up the paper (via capillary action) and separate the ink components during…
-
a student studies two different atom arrangements. arrangement 1 arrang…
Arrangements 1 and 2 are elements; elements are made of atoms or molecules composed of the same kind of atoms.
-
element 3: silicon properties: - has metallic luster - brittle - semi -…
Metalloid
-
four molecule models are shown model 1 model 2 model 3 model 4 water is…
Model 2
-
question 12 (1 point) retake question if 50 ml of h₂so₄ yields 0.300 g …
\( \approx 0.0257 \) (or more accurately, \( \frac{0.300}{233.40 \times 0.050} \approx 0.0257 \) mol/L)
-
element 2: sulfur properties: - dull yellow solid - brittle (breaks eas…
Non - metal
-
question 19 5 pts four molecular models, then options: element, compoun…
B. Compound
-
for each element below, review its properties. then, use the sentence f…
Metal
-
13. write lewis structures for the following molecules: a. nh₃ b. co c.…
- a. $\boldsymbol{\ce{H_{3}N:}}$ (or $\ce{H - \overset{..}{N} - H}$ with H on top) - b. $\boldsymbol{\ce{:C\equiv O:}}$ - c. $\boldsymbol{\ce{O=C=O}}$ (with two lone pairs on each…
-
proof is the standard measure used to determine how much alcohol is con…
T
-
question 20 5 pts image of orange dots \\bigcirc element \\bigcirc comp…
Element (the option "Element")
-
10. repeat for as many different colors as assigned. 11. repeat using a…
Permanent marker inks have non - polar components. Isopropyl alcohol (a less polar/organic solvent) dissolves these inks better than water (polar) due to "like dissolves like", so…
-
element compound mixture of elements mixture of compounds mixture of el…
s: First Diagram (Top): Compound (Option: Compound) Second Diagram (Question 18): Mixture of Compounds (Option: Mixture of Compounds) Wait, but let's confirm the second diagram. T…
-
which of the following forms of alcohol can be consumed? a. propanol b.…
D. ethanol
-
question 16 5 pts options: element, compound, mixture of elements, mixt…
Mixture of Elements and Compounds ### Second Question (with green compounds):
-
element compound mixture of elements mixture of compounds mixture of el…
Mixture of Elements ### Question 14 (Bottom Diagram)
-
when 0.25 mg$_{(s)}$ is added to 250ml of 3.00 mol/l hcl$_{(aq)}$, hydr…
\boxed{0.50} (or 0.504, depending on precision) (Note: The key is identifying the limiting reactant. If "0.25" is grams, the answer is ~0.021 g, but the problem likely means 0.25 …