Calculate the empirical formula of the following compound:

45,3 % Oxygen;

43,4 % Na;

11,3 % C

Describe two chemical reactions that require energy in order to occur

How many moles is 5x10^23 atoms of mg

Which feature is common to prokaryotic and eukaryotic cells? cell nuclei complex structures organelles cell membranes

Enter the net ionic equation for this reaction. Express your answer as a net ionic equation. Identify all of the phases in your answer. 2HCl (aq) + Ca (OH) 2 (aq) → 2H2O (l) + CaCl2 (aq)

If a sample of oxygen occupies a volume of 2.15 L at a pressure of 58.0 kPa and a temperature of 25°C, what volume would this sample occupy at 101.3 kPa and 0°C? A) 1.13 L B) 3.44 L C) 4.10 L D) 1.35 L

A student went to the dentist and found out that he had a cavity. He always brushes his teeth twice a day, so he didn't understand how he got a cavity.

A force of 8,480 n is applied to a cart to accelerate it at a rate of 26.5 m/s2. what is the mass of the cart? 865 kg 320 kg 12.1 kg 3.12 kg

Within a group, which period, top or bottom is likely to contain atoms with the larger radius?

Write the equation for the fusion of two hydrogen-1 atoms.

23.9 km + 15 km Calculate this problem and report the answer with the correct number of significant figure