What is a device invented in 1889 that plays circular, flat records?

Balance the chemical equation hcl + Naoh

How many grams of sodium benzoate, C H CO Na, have to be added to 1.50 L of a 0.0200 M solution of benzoic acid, C H CO H, to make a buffer with a pH = 4.00, assuming no volume change?

Calculate the atomic mass for zinc given the following data for its natural isotopes: 64Zn 63.929 amu 48.89 % 66Zn 65.926 amu 27.81 % 67Zn 66.927 amu 4.11 % 68Zn 67.925 amu 18.57 % 70Zn 69.925 amu 0.62 %

Name the following chemical compound: Ca (C2H3O2) 2

In a closed container at 1.0 atmosphere, the temperature of a sample of gas is raised from 300K to 400K. What will be the final pressure of the gas? * A. 0.010 atm B. 0 atm C. 100 atm D. 1.3 atm

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

How many liters of 0.75 M solution can be made using. 336 moles of lead (II) oxide?