Is sidewalk cement an element or a compound?

If all of the bonding electrons in a molecule are bonded in two hybrid sp orbitals, which shape does the molecule most likely have? linear tetrahedral trigonal planar trigonal pyramidal

What is limiting reactant? with examples

How much energy is needed to heat 20.0 grams of water from 25.0°C to 50.0 °C?

In the reaction 2Ca + O2 → 2CaO for every 2 Ca you will need how much O2? a. 1 c. 3 b. 2 d. 4

Most continuous spectra are examples of what we also call thermal radiation spectra. Why do we call them "thermal" spectra?

Combined gas law problem: a balloon is filled with 500.0 mL of helium at a temperature of 27 degrees Celsius and 755 mmHg. As the balloon rises in the atmosphere, the pressure and temperature drop.

1. What hypothesis could you propose about the relationship between the position of a type of atom in a molecule and the number of bonds that the atom forms? Explain your thinking.

The molality of a solution is a measure of - A - moles of solute per kilogram of solution B - moles of solute per liter of solution C - moles of solute per kilogram of solvent D - moles of solute per liter of solvent

Which technology has allowed for exploration beyond our solar system? A) space probe B) space station C) space shuttle D) space observatory

Which carbonate is most stable to heat? A. Sodium carbonate B. Copper (ii) carbonate C. Zinc carbonate