a powder has a mass of 40.0g when the powder is added to 30.0ml of water the total volume is 45.0ml what is the denaity of the powder

Which properties cause chemical reactions? Question options: chemical properties physical properties chemical and physical properties neither chemical nor physical properties

A 4.5-liter sample of a gas has 0.80 mole of the gas. If 0.35 mole of the gas is added, what is the final volume of the gas? Temperature and pressure remain constant. 3.9 liters 5.3 liters 6.3 liters 6.5 liters

what is the empirical formula of a compound composed of 3.25% hydrogen and 19.36% carbon and 77.39% oxygen by Mass

Solution with a ph of 3 has how many times more h + ions than one with a ph of 4? 5?

Express in scientific notation. Choose the answer with the proper number of significant figures. 1.24 x 10/6.2 x 10-3=

Model describe how you would show j. j. thomson's model of the atom using small beads and clay

Switching one substance for another is called ... ? a) displacement b) synthesis c) decomposition d) oxidation

C2h4 + O2 - CO2 + H2O If we start with 20 grams of CH4, how many moles of CO2 will form?

How does chemical energy relate to the atom and how can we use it?

A positively charged atom is known as a cation. A cation will? ... A) have more protons B) have to same number of protons and electrons. C) Be the same as a neutral atom. D) have more electrons.