What is anything that has mass and volume

What does the statement "Mass is conserved during a chemical reaction" mean?

Who was the first person to look at cells

Lewis structures cannot show the number of valence electrons. show the location of bonds. show the strength of bonds. show how many bonds are present in a molecule.

Which of the following elements are in this chemical reaction Na (s) + MgF2. (s). - NaF (s) +. Mg?

Magma that cools and crystallizes on Earth's surface forms

A 75.00 g a sample of a substance is analyzed and found to consist of 32.73 g phosphorus and 42.7 g oxygen. calculate the percent composition of this substance.

Which one of the following melts the fastest: rectangular prism, cylinder, and rectangular trapezoidal trough?

A 1.8-mL volume of seawater contains about 4.0 * 10^-10 g of gold. The total volume of ocean water is about 1.5 * 10^21 L. Calculate the total worth of all the gold in the world's oceans if the price of gold is $19.

Why are numbers placed before the elements and molecules in a chemical equation?

Which of these pairs of elements have the same number of valence electrons? oxygen (O) and bromine (Br) selenium (Se) and bromine (Br) carbon (C) and lead (Pb) oxygen (O) and carbon (C) sodium (Na) and magnesium (Mg)