Question

Налийте в пробірку розчин гідроген пероксиду об’ємом 1-2 мл, поставте її в штатив для пробірок. Що спостерігаємо? ______________________________________________ Добування кисню з гідроген пероксиду каталітичним розкладанням H 2 O 2 → ________________________ 2. Додайте в пробірку кілька дрібних шматочків сирого м’яса. Про перебіг хімічної реакції свідчить ______________________________________

Answer 1

1. 2H2O2=(над равно MnO2)2H2O+O2;

2. Начинает выделятся газ кислород, из за того, что фермент каталаза, находящийся в сыром мясе, разлагает H2O2

2H2O2=(над равно «каталаза») 2H2O+O2

Answer 2

Experiment 1: Observations when adding hydrogen peroxide to a test tube

When you pour 1-2 ml of hydrogen peroxide into a test tube and place it on a test tube stand, you will observe the following:

1. Effervescence: You will see the formation of bubbles or effervescence in the test tube. This is due to the catalytic decomposition of hydrogen peroxide (H2O2) into water (H2O) and oxygen gas (O2). The reaction can be represented as follows:

2 H2O2 → 2 H2O + O2 [[1]]

The oxygen gas produced during this reaction is responsible for the effervescence.

Experiment 2: Adding pieces of raw meat to the test tube

When you add a few small pieces of raw meat to the test tube containing hydrogen peroxide, you will observe the following:

1. Bubbling or foaming: The addition of raw meat to the hydrogen peroxide will cause bubbling or foaming to occur. This is due to the presence of an enzyme called catalase in raw meat. Catalase catalyzes the decomposition of hydrogen peroxide into water and oxygen gas at a faster rate than the spontaneous decomposition. The reaction can be represented as follows:

2 H2O2 → 2 H2O + O2

The catalase enzyme in the raw meat speeds up this reaction, resulting in the rapid production of oxygen gas and the formation of bubbles or foam [[2]].

The observations of effervescence and bubbling/foaming indicate the occurrence of chemical reactions involving the decomposition of hydrogen peroxide.