Hydrogen fuel cell powered cars emit?

a. oxygen

b. carbon dioxide

c. hydrogen

d. water

Which elements form an ionic compound? Check all the boxes that apply. aluminum and oxygen calcium and aluminum fluorine and oxygen lithium and fluorine

Compared to the atoms of a nonmetal in Period 3, the atoms of metals in Period 3 have (1) fewer valence electrons (2) more valence electrons (3) fewer electron shells (4) more electron shells

What are the five main chemical compounds of life

Assume that 8.5 L of iodine gas are produced at STP according to the following equation: 2KL+Cl2 = 2KCl + I2 How many moles of Kl were used? How many grams of Kl were used?

Combination reactions always forms what?

A compound that changes color when it comes into contact with an acid or base is an?

1. A food sample is burned in a calorimeter that contains 2000. g of water. The temperature increases from 22.0°C to 44.3 °C. How many Calories does the food sample contain, assuming all of the energy from the food was transferred into the water?

Why doesn't water light on fire? It has all the ingredients except heat! Hydrogen for the flammability factor, oxygen so it can keep burning, and all you need to do is add heat and BOOM you have a flame! 15 pts

The type of social bonds present in modern societies that are based on difference, interdependence, and individual rights is called:

The difference between ionic covalent and metallic bonding