化學
化學反應、化學計量、分子結構與元素性質。
-
chlorous acid express your answer as a chemical formula. a chemical rea…
$\ce{HClO_2}$
-
chlorous acid express your answer as a chemical formula. a chemical rea…
$\ce{HClO_2}$
-
express your answer as a chemical formula. hcn previous answers ✓ corre…
$\ce{HClO2}$
-
hydrocyanic acid express your answer as a chemical formula. a chemical …
\(HCN\)
-
hydrofluoric acid express your answer as a chemical formula. a chemical…
\(HF\)
-
part a what is the formula for hydrobromic acid? hbro₃ hbro₂ hbro hbr
D. HBr
-
hbro₃ spell out the full name of the acid. submit request answer ▼ part…
bromic acid ### Part B
-
part a what is the basic form for the name of oxyacids whose oxyanions …
[base oxyanion name + ic][acid] (the middle option among the three choices)
-
spell out the full name of the compound. dinitrogen pentasulfide previo…
$S_2F_{10}$
-
enter the name for n₂s₅. spell out the full name of the compound.
dinitrogen pentasulfide
-
enter the formula for tetraphosphorus trisulfide. express your answer a…
$P_4S_3$
-
enter the name for s₂cl₂. spell out the full name of the compound.
disulfur dichloride
-
tetraphosphorus triselenide express your answer as a chemical formula. …
$P_4Se_3$
-
diboron tetrachloride express your answer as a chemical formula. a chem…
$B_2Cl_4$
-
diboron tetrachloride express your answer as a chemical formula. a chem…
$\ce{B2Cl4}$
-
carbon tetrabromide express your answer as a chemical formula. a chemic…
$CBr_4$
-
xenon hexafluoride express your answer as a chemical formula. a chemica…
$XeF_6$
-
xenon tetroxide express your answer as a chemical formula. a chemical r…
\( \text{XeO}_4 \)
-
xenon tetroxide express your answer as a chemical a chemical reaction d…
$\ce{XeO4}$
-
chlorous acid express your answer as a chemical formula.
$\ce{HClO2}$
-
hydrocyanic acid express your answer as a chemical formula.
\(HCN\)
-
hydrocyanic acid express your answer as a chemical formula.
$\ce{HCN}$
-
chlorine monoxide express your answer as a chemical formula. a chemical…
$ClO$
-
what is the formula for vanadium(iii) oxide? options: v₃o, v₂o₃, vo, vo₃
B. \( V_2O_3 \) (assuming the options are labeled as A. \( V_3O \), B. \( V_2O_3 \), C. \( VO \), D. \( VO_3 \))
-
hydrofluoric acid express your answer as a chemical formula.
$HF$
-
name the compound baso₄. options: barium monosulfur tetraoxygen, barium…
D. barium sulfate
-
missed this? watch practice what is the formula for hydrofluoric acid? …
B. HF
-
hio₃ spell out the full name of the acid.
iodic acid
-
<5.7-9 self assessment 5.8 - enhanced - with feedback missed this? watc…
The correct answer is the option: lithium(I) phosphide (or lithium phosphide, but based on the options and the selected one, lithium(I) phosphide is the intended answer here). Wai…
-
part a hbro₂ spell out the full name of the acid.
bromic acid
-
what is the basic form for the name of oxyacids whose oxyanions end wit…
[base oxyanion name + ic][acid]
-
enter the formula for diselenium decafluoride. express your answer as a…
$Se_2F_{10}$
-
enter the name for as₂s₃. spell out the full name of the compound.
diarsenic pentasulfide
-
part b enter the formula for tetraphosphorus heptasulfide express your …
$P_4S_7$
-
enter the name for te₂cl₂.
Ditellurium trichloride
-
enter the name for te₂cl₂ spell out the full name of the compound.
dite (no, di-tellurium di-chloride) Wait, no, the correct name is dite (no, "di-tellurium di-chloride" is correct? Wait, no, "di" + "tellurium" is "dite" no, "di-tellurium" is cor…
-
tetraphosphorus triselenide express your answer as a chemical formula. …
\( P_4Se_3 \)
-
express your answer as a chemical formula.
XeO₃
-
chlorine monoxide express your answer as a chemical formula. a chemical…
$ClO$
-
what is the formula for iron(iii) oxide? ○ feo ○ fe₂o ○ feo₃ ○ fe₂o₃
$\boldsymbol{\text{Fe}_2\text{O}_3}$ (the last option, assuming the last option is $\text{Fe}_2\text{O}_3$ as per typical iron(III) oxide formula)
-
name the compound baso₄. options: barium sulfate, barium tetrasulfate, …
A. barium sulfate
-
part a name the compound li₃p. ○ trilithium phosphide ○ lithium phosphi…
B. lithium phosphide
-
how many valence electrons are contributed by the oxygen atoms in ch₂o?…
\(6\) (the third option)
-
sr atom sr ion +1 +2 +3 -1 -2 -3
The charge of the Sr atom is \(0\) (neutral atom). The charge of the Sr ion is \(+ 2\) (because it loses 2 electrons).
-
which of the molecules and polyatomic ions cannot be adequately describ…
\(O_{3}\), \(CO_{3}^{2 -}\)
-
is this element a metal or nonmetal? is the formed ion a cation or an a…
- Is this element a metal or nonmetal? Metal - Is the formed ion a cation or an anion? Cation
-
atom ion +1+2+3-1-2-3
The charge of the fluorine atom is $0$, and the charge of the fluorine ion is $-1$.
-
is this element a metal or nonmetal? is the formed ion a cation or an a…
- Is this element a metal or nonmetal? Nonmetal - Is the formed ion a cation or an anion? Anion
-
question 2 of 7 what is the total number of outer (valence) electrons i…
\(17\)
-
question 1 of 7 identify the number of core and valence electrons for e…
Ar: 10 core electrons, 8 valence electrons Ca: 18 core electrons, 2 valence electrons F: 2 core electrons, 7 valence electrons
-
question 2 of 10 which of these is a poetic device walt whitman often u…
D. Personification
-
question 1 of 10 read these lines from emily dickinsons poem \324\ (\so…
B. abcb
-
9. draw diagrams to show how each of the covalent compounds below is fo…
### For HCl: #### Step 1: Determine Valence Electrons Hydrogen (H) has 1 valence electron, and Chlorine (Cl) has 7 valence electrons. #### Step 2: Show Electron Sharing H needs 1 …
-
how many moles of water, h₂o, contain 2.0 × 10²² molecules of water? (s…
0.033
-
how many moles of water, h₂o, contain 2.0 × 10²² molecules of water? (s…
0.033
-
ionic compounds if given the formula, give the name and vice versa: a) …
$Pb(ClO_4)_2$ ### Part (c) - zinc nitride
-
ionic compounds if given the formula, give the name and vice versa: a) …
\( \text{Pb(ClO}_4\text{)}_2 \) ### Part (c)
-
name: identifying ionic compounds, covalent compounds, and polyatomic i…
s: a) I b) Pi c) C d) I e) I f) Pi g) C h) C i) C j) I k) I l) I m) Pi n) I o) I p) I q) I r) I s) I t) Pi
-
tony, a student of portland state university, was working on a chemistr…
adware
-
match each scenario with the government agency it involves. environment…
- Dwayne's company scenario: Occupational Safety and Health Administration - Ryan's new car scenario: Environmental Protection Agency - Lisa's yogurt scenario: Food and Drug Admin…
-
part c calculate the molar mass of norepinephrine (c8h11no3), a hormone…
169.18 g/mol
-
write the name of each compound below: a) li₂co₃ b) mg(hco₃)₂ c) na₂so₄…
Lithium carbonate ### Part b) \( \text{Mg(HCO}_3\text{)}_2 \)
-
th polyatomic lons j) copper (ii) nitrate k) potassium dichromate l) so…
To solve for the chemical formulas of the remaining compounds (p - r), we use the rules of ionic compound formation (criss - cross method for balancing charges). ### p) Aluminum H…
-
1. observe the combustion of a candle. identify each substance in the t…
- $\ce{CO_2}$: A. Product; B. Turns limewater cloudy (or other $\ce{CO_2}$ detection evidence) - $\ce{O_2}$: C. Reactant; D. Used up in combustion (air is needed for flame) - $\ce…
-
3. the double replacement reaction is between aqueous lead(ii) nitrate …
The possible products are $\ce{KNO_{3}}$ and $\ce{PbI_{2}}$, so the correct options are: - $\ce{KNO_{3}}$ - $\ce{PbI_{2}}$
-
4. write lewis structures that obey the octet rule for each of the foll…
a) ``` Cl | Cl — C — H | Cl (Each Cl has 3 lone pairs) ``` b) ``` [H] | H — N — H⁺ | H (Brackets around structure with + charge) ``` c) ``` O || H — C — H (O has 2 lone pairs) ```
-
read the excerpt from \a modest proposal\ and the summary that follows.…
It does not effectively paraphrase the excerpt or correctly use a quotation.
-
read the excerpt from \a modest proposal\. a very worthy person, a true…
anyone who is truly virtuous or patriotic would not suggest using children for food, so Swift means the opposite of what he says.
-
which statements are part of the safety protocol for this lab experimen…
- Wear a lab coat and safety goggles when performing an experiment. - Always measure chemical quantities twice before adding to solution. - Use caution when connecting electric ci…
-
which object represents a negatively charged particle? which object rep…
B. Object B ### 2. Which object represents a positively charged molecule?
-
5. what volume of 0.496 m hcl is required to neutralize 20.0 ml of 0.80…
32.5 mL
-
5. what volume of 0.496 m hcl is required to neutralize 20.0 ml of 0.80…
32.6 mL
-
solution stoichiometry solve the following solutions stoichiometry prob…
12.4 g (rounded to 3 significant figures)
-
a chemical reaction takes place inside a flask submerged in a water bat…
32.6°C
-
a gas made up of homonuclear diatomic molecules escapes through a pinho…
$\text{O}_2$
-
a gas made up of atoms escapes through a pinhole 1.87 times as fast as …
Ne
-
try again your answer is incorrect. calculate the heat of reaction δh f…
-1058
-
calculate the heat of reaction \\( \\delta h \\) for the following reac…
-1058 $\frac{\text{kJ}}{\text{mol}}$
-
calculate the heat of reaction \\( \\delta h \\) for the following reac…
81
-
measurements show that the energy of a mixture of gaseous reactants inc…
541 kJ endothermic
-
measurements show that the enthalpy of a mixture of gaseous reactants i…
305 kJ endothermic
-
9. balance the equation for propane (c₃h₈) is burned. by dragging coeff…
10
-
9. balance the equation for propane (c₃h₈) is burned, by dragging coeff…
The balanced equation is $\boldsymbol{1\ce{C3H8} + 5\ce{O2} ightarrow 3\ce{CO2} + 4\ce{H2O}}$
-
9. balance the equation for propane ($c_3h_8$) is burned. by dragging c…
The balanced equation is \( \boldsymbol{1}\ce{C3H8 + 5O2 -> 3CO2 + 4H2O} \), so the coefficients are 1 (for \( \ce{C3H8} \)), 5 (for \( \ce{O2} \)), 3 (for \( \ce{CO2} \)), and 4 …
-
9. balance the equation for propane (c₃h₈) is burned. by dragging coeff…
The balanced equation is \( \boldsymbol{1}\ce{C3H8 + 5O2 -> 3CO2 + 4H2O} \), so the coefficients are 1 (for \( \ce{C3H8} \)), 5 (for \( \ce{O2} \)), 3 (for \( \ce{CO2} \)), and 4 …
-
8. identify the reaction type, the reactants, and the products.propane …
- Reaction Type: Combustion - Reactants: \( \text{C}_3\text{H}_8 + \text{O}_2 \) - Products: \( \text{CO}_2 + \text{H}_2\text{O} \)
-
7. identify the products of the following reaction. zn + hcl → i need a…
The option with \( \text{Zn} + 2\text{HCl} ightarrow \text{ZnCl}_3 + \text{H}_2 \) (assuming typo in \( \text{ZnCl}_3 \), should be \( \text{ZnCl}_2 \)) is the intended correct on…
-
6. identify the products of the following reaction. ni + kcl → i need a…
No Reaction
-
5. use the solubility rules to identify the precipitate in the reaction…
The precipitate formed is $\ce{Co(OH)_{3}}$, so the correct option is $\ce{Co(OH)_{3}}$.
-
5. use the solubility rules to identify the precipitate in the reaction…
$\ce{Co(OH)_{3}}$
-
5. use the solubility rules to identify the precipitate in the reaction…
$\ce{Co(OH)_{3}}$
-
4. add coefficients to balance the equation when aqueous solutions of p…
1, 3, 1, 3 (coefficients for \( \text{Co(NO}_3\text{)}_3 \), \( \text{KOH} \), \( \text{Co(OH)}_3 \), \( \text{KNO}_3 \) respectively)
-
4. add coefficients to balance the equation when aqueous solutions of p…
The coefficients are 1 (for $\ce{Co(NO_{3})_{3}}$), 3 (for $\ce{KOH}$), 1 (for $\ce{Co(OH)_{3}}$), and 3 (for $\ce{KNO_{3}}$). So filling in the boxes: 1, 3, 1, 3.
-
7. a mixture of gases contains 5.00 grams of ne, 5.00 grams of o₂, and …
Mole fraction of Ne ≈ 0.479; Mole fraction of O₂ ≈ 0.302; Mole fraction of CO₂ ≈ 0.219
-
3. identify the reaction type, the reactants, and the products. reactio…
- Reaction Type: Double - Displacement (Precipitation) - Reactant(s): \(KOH\) + \(Co(NO_3)_3\) - Product(s): \(KNO_3\) + \(Co(OH)_3\)
-
3. identify the reaction type, the reactants, and the products. reactio…
- Reaction Type: Double - Displacement (Precipitation) - Reactant(s): $\ce{KOH}$ + $\ce{Co(NO_{3})_{3}}$ - Product(s): $\ce{KNO_{3}}$ + $\ce{Co(OH)_{3}}$
-
2. complete the reaction for magnesium combines with oxygen by balancin…
2 Mg + 1 O₂ → 2 MgO (So the coefficients are 2, 1, 2)
-
1. identify the reaction type, the reactants, and the products. hint: i…
Reaction Type: Combination (Synthesis) Reactant(s): \( \text{Mg} + \text{O}_2 \) Product(s): \( \text{MgO} + \) [Blank Tile] (Note: The choices for reactants are Mg and O₂; for pr…
-
6. identify the single replacement reaction that will not occur. hint: …
\( \text{Mg} + \text{Na}_2\text{SO}_4 ightarrow \) (this single replacement reaction will not occur)
-
5. identify the reaction type shown here. 2ca + o₂ → 2cao show the reac…
Combination