In a chemical equation, (aq) after one of the substances means that it is which of these? a solid formed from two ionic substances produced from nothing released as gas dissolved in water

1) Explain why the overall charge of a nucleus positive? 2) why are three terms for the location of electrons in an atom?

Draw a venn diagram and fill in the characteristics of the states of matter

Which best represents the reaction of calcium and zinc carbonate (ZnCO3) to form calcium carbonate (CaCO3) and zinc? O Ca-ZnCO3 + CaCO3 - Zn O Ca + ZnCO3 → CaCO3 + Zn O CaCO3 + Zn → Ca + ZnCO3 O CaCO3 + Zn + Ca - ZnCO3

During a medical screening, lung capacity testing is a standard procedure. a. True b. False

Convert the mass of na2co3 to moles, given its molar mass (mm) of 105.989 g/mol

Before running other simulations, try to think of solutions to this global energy dilemma. Write a paragraph in response to the following questions: Should we invest more heavily in renewables at a high up-front financial cost, and/or should we

What is a sedimentary rock formed from the remains of tiny sea animals.

Consider the following thermochemical equation: C (s) + O2 (g) → CO2 (g) ΔH = - 393 kJ CO (g) + ½O2 (g) → CO2 (g) ΔH =

Two colorless solutions are mixed together. Bubbles form as the solution is stirred. Give TWO possible explanations for this result.

What is a light-year? A. the distance light travels in one earth year B. the distance light travels from the sun to the earth C. the distance light travels in one orbit of the moon D. the time it takes light to travel across the universe