Why is oxygen an element? a it is essential to life b it burn c it combines with hydrogen d it cannot be broken down into a simple substance through chemical means

Is this equation endothermic or exothermic? How do you know? 2NaCl + 822 kJ - -> 2Na + Cl2

Why do we call water the univeral salivnet

What two aqueous solutions are combined the reaction forms a solid that settles out of solution. what is this solid called?

What is theWhat is the approximate tilt of the earth's axis? approximate tilt of the earth's axis?

An electric range burner weighing 683.0 grams is turned off after reaching a temperature of 477.6°C, and is allowed to cool down to 23.2°C. Calculate the specific heat of the burner if all the heat evolved from the burner is used to heat 552.

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