Which one of these equations is balanced? a. Zn + 2hcl - - > ZnCl2 + H2 b. S8 + 24F2 - - > 8SF6

a

b

a and b

neither

What is an ecosystem? living environment by the way

Is cutting a paper snowflake a chemical or physical change and why?

2. Which types of changes observe the law of conservation of mass? A. only changes of state B. only physical changes C. only chemical changes D. physical changes and chemical changes

What is the formula of sulfurous acid?

Which of these is an example of a chemical change? Deflating a rubber balloon Combining rubber with sulfur Stretching an elastic rubber band Erasing pencil marks from a page

In the synthesis reaction, the white powder produced is magnesium oxide (mgo, mm = 40.3 g/mol). how many moles of magnesium oxide were formed (number of moles = mass (g) / molar mass (g/mol)) ? choose the closest answer. a. 0.21 moles b. 0.

Which of the following is the most likeley example of an favorable mutation A. A mutation that makes a rabbit able run faster B. A mutation that changes the rabbit's fur to bright orange C. A mutation that changes the color of the rabbit's eyes D.

Which of these mole ratios is possible for this reaction? FeCl3 + 3NaOH → Fe (OH) 3 + 3NaCl 1:1 1:3 3:1 2:3

The chemical equation for reduction of phosphorite Ca3 (PO4) 2

Synthesize What environmental effects are shared by all fossil fuels?