An unknown substance has a mass of 15.5 g. When the substance absorbs 1.395*102 J of heat, the temperature of the substance is raised from 25.0 ∘C to 45.0 ∘C. What is the most likely identity of the substance?

How many moles of sucrose (C12H22O11) would be in 8.7 L of a 1.1 M solution of sucrose?

What quantitative information is revealed by a chemical equation

H-1 H-2 H-3 The symbols represents isotopes of the element hydrogen (H). The number following the symbol represents a change in A) protons and mass number. B) neutrons and mass number. C) neutrons and atomic number. D) electrons in energy levels.

Fe3O4 (s) + 4H2 (g) 3Fe (s) + 4H2O (g) Using standard thermodynamic data at 298K, calculate the entropy change for the surroundings when 1.79 moles of Fe3O4 (s) react at standard conditions. S°surroundings = J/K

Gretchen wants to run a test to discover whether glass, copper, wood, or plastic conduct electricity. She sets up a circuit connecting a battery to a light bulb, with a small gap she will use to test the conductivity of the different substances.

Which atomic particle dtermines the chemical behaviour of an atom?

If you could travel to the Sun and back, about how far would you travel? A. 1 AU B. 2 AU C. 5 AU D. 10 AU

A scientist is conducting a descriptive experiment where she is monitoring sea level along coastal towns in California. What is a major benefit of this experiment? The relationship shows cause and effect. It is repeatable.

If the sum of the mass of the reactants is 12.5 what would be the sum of the products be? And explain how you know this

Name 5 types of alloys