Calcium carbonate () is 34.5% Ca by mass. In a 418 g sample of, how many grams of calcium are present?

Ethanol contains the elements carbon, hydrogen, and oxygen. When ethanol burns, it chemically reacts with oxygen gas. C2H6O + O2 ethanol oxygen gas What elements will be present in the substances that are created when ethanol burns? A.

1. A cube has a mass of 40 grams. One side of the cube has a length of 3.4. What is the Density of the cube?

In the lab, you are thirsty and would like a drink. Can you use the beaker as a cup?

10. If 32.4 mole of CO react with excess Fe2O3, how many moles of Fe will form?

What occurs when the products have less enthalpy than the reactants?

Which indicator will be the same color in hydrochloric acid as it is in pure water? 1. methyl orange 2. phenolphthalein 3. bromcresol green

Based on your knowledge of energy resources conservation, which of the following statements is true? a) Manufacturers can increase a light bulb's energy efficiency by using technology that decreases the amount of electromagnetic energy the bulb

Ammonia (nh3 (g), hf = - 46.19 kj/mol) reacts with hydrogen chloride (hcl (g), hf = - 92.30 kj/mol) to form ammonium chloride (nh4cl (s), hf = - 314.4 kj/mol) according to this equation:

How does an electromagnet create a magnetic field

Magnetism, reactivity, and fluorescence are three special properties used to identify minerals. true or false