To confirm that a chemical reaction has taken place during the reaction between hydrochloric acid (HCl) and calcium carbonate (CaCO3), you can look for the following observations:

1. **Formation of Bubbles (Gas Evolution)**: When HCl reacts with CaCO3, carbon dioxide gas (CO2) is produced. The presence of bubbles escaping from the solution indicates that a gas is being formed, which is a sign that a chemical reaction has occurred.

2. **Change in Temperature (Heat Release or Absorption)**: The reaction can also be associated with a noticeable change in temperature. If the reaction releases heat (exothermic) or absorbs heat (endothermic), this can be observed as a temperature change, further confirming that a chemical change has taken place.

These observations provide evidence of the chemical reaction occurring between HCl and CaCO3.

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To confirm that a chemical reaction has taken place during the reaction between hydrochloric acid (HCl) and calcium carbonate (CaCO3), you can look for the following observations:

1. **Formation of Bubbles (Gas Evolution)**: When HCl reacts with CaCO3, carbon dioxide gas (CO2) is produced. The presence of bubbles escaping from the solution indicates that a gas is being formed, which is a sign that a chemical reaction has occurred.

2. **Change in Temperature (Heat Release or Absorption)**: The reaction can also be associated with a noticeable change in temperature. If the reaction releases heat (exothermic) or absorbs heat (endothermic), this can be observed as a temperature change, further confirming that a chemical change has taken place.

These observations provide evidence of the chemical reaction occurring between HCl and CaCO3.

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To confirm that a chemical reaction has taken place during the reaction between hydrochloric acid (HCl) and calcium carbonate (CaCO3), you can look for the following observations:

1. **Formation of Bubbles (Gas Evolution)**: When HCl reacts with CaCO3, carbon dioxide gas (CO2) is produced. The presence of bubbles escaping from the solution indicates that a gas is being formed, which is a sign that a chemical reaction has occurred.

2. **Change in Temperature (Heat Release or Absorption)**: The reaction can also be associated with a noticeable change in temperature. If the reaction releases heat (exothermic) or absorbs heat (endothermic), this can be observed as a temperature change, further confirming that a chemical change has taken place.

These observations provide evidence of the chemical reaction occurring between HCl and CaCO3.

For the reaction HCl + Ca CO3 -> Ca Cl2 + CO24a. Suggest 2 observations that makes you confirm a chemical reaction have taken place

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