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In **Chemistry** / **High School** | 2025-08-20

[Answered] Collect data: Beginning with Na, record the number of energy levels, number of protons, and atomic radius for each element in period 3. | Element | Na | Mg | Al | Si | P | S | Cl | Ar | |---|---|---|---|---|---|---|---|---| | Number of energy levels | | | | | | | | | | Number of protons | | | | | | | | | | Atomic radius $(pm)$ | | | | | | | | |

In **Mathematics** / **College** | 2025-08-20

[Answered] Find the 9th term of the geometric sequence $7, 14, 28, \ldots$

In **Mathematics** / **High School** | 2025-08-20

[Answered] What is the mean of the following set of numbers? $18, 12, 15, 17, 14, 11, 17, 14$ Stephen scored the following points in an online game: $122, 145, 144, 168, 125$ and $142$. What is his average score?

In **Mathematics** / **College** | 2025-08-20

[Answered] Define the subject of this question using one of the following options: Mathematics, History, English, Biology, Chemistry, Physics, Social Studies, Advanced Placement (AP), SAT, Geography, Health, Arts, Business, Computers and Technology, French, German, Spanish, World Languages, Medicine, Law, Engineering. Define the grade of this question using one of the following options: Middle School, High School, College.

In **Mathematics** / **College** | 2025-08-20

[Answered] Select the correct answer. Express the terms of the following sequence by giving an explicit formula [tex]$9,12,15,18,21, \ldots$[/tex] A. [tex]$u(n)=6+3 n$[/tex], where [tex]$n=1,2,3,4, \ldots$[/tex] B. [tex]$u(n)=n+3$[/tex], where [tex]$n=1,2,3,4, \ldots$[/tex] C. [tex]$u(n)=3+n$[/tex], where [tex]$n=1,2,3,4 \ldots$[/tex] D. [tex]$u(n)=3 n$[/tex], where [tex]$n=1,2,3,4, \ldots$[/tex]

In **Mathematics** / **High School** | 2025-08-20

[Answered] Write two addition equations that each have a sum of -21.5

In **Physics** / **College** | 2025-08-20

[Answered] Calculate $\frac{(6.34 cm)(1.2 cm)}{\left(1.217 cm^2\right)}$. Round off if necessary to apply the rule of significant figures for multiplication and division of data.

In **Chemistry** / **High School** | 2025-08-20

[Answered] A sample of water has a mass of 100.0 g. Calculate the amount of heat required to change the sample from ice at [tex]$-45.0^{\circ} C$[/tex] to liquid water at [tex]$75.0^{\circ} C$[/tex]. Use the chart to complete the multiple steps required to arrive at the final answer. Type in your answers below using 3 digits. [tex] \begin{array}{l} q_1=\square kJ \\ q_2=\square kJ \\ q_3=\square kJ \\ q_{tot}=\square kJ \end{array} [/tex] [tex]\begin{tabular}{|l|l|l|l|} \hline $\Delta T ( C )$ & Phase Chango & Constant & Formula \\ \hline $-45.0 \rightarrow 0.00$ & Warm solid & $C _{0.2003}= 2093 J / g ^{\circ} C$ & $q _1= cm \Delta T$ \\ \hline 0.00 & Melt solid & $\Delta H_{\text {max }}= 40.7 kJ / mol$ & $q _2= n \Delta H _{ kvs }$ \\ \hline $0.00 \rightarrow 75.0$ & Warm liquid & $C_{0.1024}= 4.184 J / g ^{\circ} C$ & $q _3= cm \Delta T$ \\ \hline $-45.0 \rightarrow 75.0$ & Sol $\rightarrow$ liq & & $q_{12}=q_1+q_2+q_3$ \\ \hline \end{tabular}[/tex]

In **Physics** / **High School** | 2025-08-20

[Answered] Formulas: [tex]S=d / t \quad S t=d \quad t=d / S[/tex] 1. A car travels 300 km in 6 hours. What is the average speed of the car (in [tex]km / hr[/tex])?

In **Chemistry** / **High School** | 2025-08-20

[Answered] Which substance is a strong electrolyte? $NH _3$ $Ba ( OH )_2$ $C _{12} H _{22} O _{11}$ $CH _3 COOH$