If energy is shown on the product side of the equation, then the

1.

reaction

A.

is exothermic.

B.

is endothermic.

C.

does not require any activation energy.

D.

does not include

any

other product.

Which physical property is used to test the purity of a metal? A. hardness B. density C. viscosity D. malleability

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What elements are found in sucrose

What happens to the radius of an atom when an element loses an electron? What charge des the element have?

In general as the similarity of the structure between solvent and solute increases the solubility does what

The relationship between number of particles and pressure is As number of particles increases, pressure increases As number of particles increases, pressure decreases The two are not related

Consider the reaction: Al2S3 + 6 HCl → 2 AlCl3 + 3 H2S The reaction has a 29.1% yield. How many grams of Al2S3 are needed to react with 30.0 moles of HCl? a) The molar mass of Al2S3 is 150.16 grams/mole. b) The molar mass of HCl is 36.46 grams/mole.

Why is Earth's temperature just right for life? A. Earth's core is hot enough to heat Earth's surface. B. Earth's magnetic field creates suitable temperatures on Earth's surface. C. Earth's crust is warmed by heat from the sun. D.

Which of the following is an example of a chernical change? Boiling water Burning paper Dissolving sugar in water Melting gold

Part a by drawing molecular orbital diagrams for b2, c2, n2, o2, and f2, predict which of these homonuclear diatomic molecules are magnetic.