Endothermic...a reaction that absorbs heat. That it is why it feels cold to the touch, it is absorbing heat away from the surface of your skin.

The answer is; **relative dating**

Through relative dating, rock layers are able to be sequenced with regards to their ages relative to each other. This, therefore, does not determine the absolute age of the rock layers (absolute dating). Techniques used in relative dating include stratigraphy and biostratigraphy that determine which layer is older than the other. In absolute dating, methods employed are carbon-dating and radiometric dating.

**Answer:**

100. mL

**Explanation:**

**Step 1: Write the balanced equation for the double displacement reaction**

CaCl₂ + Na₂CO₃ ⇒ 2 NaCl + CaCO₃

**Step 2: Calculate the moles corresponding to 1.00 g of CaCO₃**

The molar mass of CaCO₃ is 100.09 g/mol.

1.00 g × 1 mol/100.09 g = 0.0100 mol

**Step 3: Calculate the moles of CaCl₂ required to produce 0.0100 moles of CaCO₃**

The molar ratio of CaCl₂ to CaCO₃ is 1:1. The moles of CaCl₂ required are 1/1 × 0.0100 mol = 0.0100 mol.

**Step 4: Calculate the volume of 0.100 M CaCl₂ that contains 0.0100 mol**

0.0100 mol × 1 L/0.100 mol × 1000 mL/1 L = 100. mL

Answer:

Chemical Equation Balancer Sn + NaOH = Na2SnO2 + H2.

Explanation: