What is an example of a physical change involving iron and a chemical change involving iron?

If your heart beats an average of 68 times per minute, how many times will your heart beat in an hour? In a day? In a week? Show all work

Which is not a compound? sugar water silicon dioxide gold

A complete soil profile includes three layers- A. topsoil, midsoil, and bottomsoil. B. drysoil, wetsoil, and thicksoil. C. topsoil, subsoil, and parent material. D. richsoil, parent material, and subsoil.

One solution turns blue. A possible hydrogen ion concentration for this solution is: 1 * 10-2 M 5 * 10-2 M 5 * 10-4 M 1 * 10-8 M

To what volume should you dilute 133 mL of an 7.90 M copper (II) chloride solution so that 51.5 mL of the diluted solution contains 4.49 grams of copper (II) chloride? Report your answer to 3 sigfigs, not including units when you type in your answer

Which of the following is a single replacement reaction? a. 2SO2 + O2 - > 2S03 b. Zn + Cu (NO3) 2 → Zn (NO3) 2 + Cu c. 2H2O2-> 2H2O + O2 d. AgNO3 + NaCl → AgCl + NaNO3

Glucose and fructose are monosaccharides that have the same chemical formula, C6H12O6. However, they do not react the same chemically. Which of the following generalizations can explain this?

what is the empirical formula for a compound which contains 32% carbon, 42.66% oxygen, 18.67 nitrogen, 6.67 % hydrogen

What type of reaction is shown in this thermochemical equation? A + B + heat → C + D endothermic combination decomposition exothermic

The valence electrons of representative ("a" groups) elements are