What is the nuclear charge of an atom with a mass of 23 and an atomic number of 11?

Mixture or pure substance: 1. water 2. blood 3. the oceans 4. iron 5. brass 6. uranium 7. wine 8. leather 9. table salt (NaCl)

What conversion factor will change moles CO2 to grams CO2? moles H2O to molecules H2O

A gas occupying a volume of 425 mL at a pressure of 2 atm is allowed to expand until the pressure reaches 588 mmHg. What is the final volume in mL?

What is the type of compound of copper and oxide?

Geologic evidence shows that Earth's tectonic plates can move thousands of kilometers across the Earth's surface. These movements A. do not change the Earth's surface at all. B. occur gradually over millions of years. C. occur due to human activity.

How many moles are in 23.4 g

A chemist prepares hydrogen fluoride by means of the following reaction: CaF2 + H2SO4 - -> CaSO4 + 2HF The chemist uses 11 g of CaF2 and an excess of H2SO4, and the reaction produces 2.2 g of HF. (a) Calculate the theoretical yield of HF.

Gaps in rock layers that develop when agents of erosion remove existing rock layers

Why are atoms always neutral

Question: Ron is a healthcare worker who needs to lift a heavy patient. Which kind of safety issue does this scenario relate to? A infection B. ergonomics C. human resources D. orientation