What is the significant figure of 5,000,000,000,000

What is the correctly balanced chemical equation for the reaction of KOH and H2SO4

According to atomic theory: a. the nucleus is positively charged. b. the nucleus contains both charged and uncharged particles. c. the electrons contribute very little to the total mass of the atom. d.

How are ionic compound formed? when atoms share electrons to complete eight valence electrons when atoms lose electrons and form positive ions when electrons are transferred from one atom to another forming positive and negative ions that atract

Consider the reaction of Mg3N2 with H2O to form Mg (OH) 2 and NH3. If 4.33 g H2O is reacted with excess Mg3N2 and 6.26 g of Mg (OH) 2 is ultimately isolated, what is the percent yield for the reaction?

We drop a cube of ice into a glass of water. The mass of the cube of ice is 33.1 g and its initial temperature is - 10.2∘C. The mass of the water is 251 g and its initial temperature is 19.7∘C.

Examples of chemical and physical changes

Is when hot parts of the earth rise as cooler parts sink due to differences in density.

Distinguish between the structures of arteries, capillaries, and venies. what is the function of each.

Which phase of matter has a fixed volume but variable shape

Given 10.8 grams of substance Y, if the substance absorbs 231 kilojoules of energy and the specific heat of the substance is 6.55 J/g·°C, what is the change in temperature?