During ________, a cell's chromosomes are divided into two new nuclei.

Imagine you are a tour guide. You and the tour group have shrunk to the size of water molecules to start your tour of the cell. Write a narrative of your tour that you could give a new tour guide to use.

Which substance is the reducing agent in this reaction?

$$\mathrm{Cr_2O_7^{2−} + 3 HNO_2 + 5H^+ \longrightarrow 2 Cr^{3+} + 3 NO_3^− + 4 H_2O}$$

Express your answer as a chemical formula.

Which element is reduced in this reaction Cr$_2$O$_7^{2−}$+3HNO$_2$+5H$^+$→2Cr$^{3+}$+3NO$_3^-$+4H$_2$O? Write the chemical symbol of the element.

Which substance is the oxidizing agent in this reaction?

fe2o3+3co→2fe+3co2

express your answer as a chemical formula?

In this redox reaction, identify the element that was reduced:

$$\ce{Fe2O3(s) + 3CO(g) -> 2Fe(s) + 3CO2(g)}$$

In the following reaction which element is oxidized?

$$\ce{2Na(s) + Cl2(g)→2NaCl(s)}$$

Use oxidation states to identify the oxidizing agent and the reducing agent in the following redox reaction.

$$2 \mathrm{Na}(s)+2 \mathrm{H}_2 \mathrm{O}(l) \longrightarrow 2 \mathrm{NaOH}(a q)+\mathrm{H}_2(g)$$

What element is undergoing oxidation (if any) in the following reaction?

$$\ce{CH4(g) + 2O2(g) \rightarrow CO2 (g) + 2H2O (g)}$$

In a plant cell, how are the functions of the cell wall and the cell membrane alike? How are they different?

A certain cell can no longer package and release materials out of the cell. Which of the cell's organelles is not working? Infer.

In cellular respiration where do the electrons in the electron transport chain come from and what is their final destination?

Mitochondria and chloroplasts are two types of _______.

Which cellular structures are found in plant cells but NOT in animal cells?

a. chloroplast and cell wall

b. Golgi apparatus and vacuole

c. mitochondrion and ribosome

d. endoplasmic reticulum and nucleus