What is usually released as a product in a combustion reaction?
a.) elemental oxygen
b.) elemental carbon
c.) energy
d.) a carbon- based fuel
which of the following best describes why mnso4 > mno is not a synthesis reaction?
a.) energy is not a product in this reaction
b.) the reaction has more than one product
c.) oxygen is not a reactant in this reaction
d.) the equation is not balanced
a reaction that is essentially the opposite of synthesis reaction describes which of the following?
a.) displacement
b.) combustion
c.) decomposition
d.) oxidation-reduction
double displacement reactions are often defined by which of the following?
a.) release of light
b.) use of oxygen as a reactant
c.) formation of a precipitate
d.) breakdown of only one compound

Follow the steps provided in the simulation to add water to the graduated cylinder, select one of the three samples (copper, silver, or gold), set its mass to the values given in the statements below, and calculate its density. here is a summary of the steps required: add water by clicking and holding prepare a known volume of water button. until the desired volume of water has been added. if more than the desired volume is added, click the reset button. button and redo the procedure. a single click will add about 21.0 ml of water. to set the mass, click and hold weigh out metal button. until the desired amount of metal is added to the weighing pan. once the desired mass of the metal is added, release the button. transfer the metal to water and then click on calculate density button. to see how the density is calculated using water displacement to measure the volume of the solid. to save time you can approximate the initial volume of water to â±1 ml and the initial mass of the solid to â±1 g. for example, if you are asked to add 23 ml of water, add between 22 ml and 24 ml. which metals in each of the following sets will have equal density? check all that apply.

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

Identify the missing numbers below to show the result of multiplying the numbers (1.6 × 10-19)(5.0 × 106) = c × 10d