Which is a pure substance?

A) Trail mix

B) Table salt

C) Salt water

D) Pasta salad

Which of the following statements is true? Question 4 options: A) Neutrons have a negative charge. B) Electrons have a negative charge. C) The n=1 shell can hold eight electrons.

Which of the following gases will have the highest rate of effusion at a given temperature? Cl2 He O2 Ne

Balance chemical equation ClO2+H2O=HClO3+HCl

Which of the following is false about a spontaneous chemical reaction that generates electricity:a. Oxidation and reduction half-reactions occur at electrodes in electrochemical cells. b.

What would cause the equilibrium to shift left in this reaction? CO + 3H2 ⇌ CH4 + H2O A. adding heat to the product mixture B. a faster rate of forward reaction C. increased collisions between CO and H2 D. the escape of water from the mixture E.

Ions that consist of a single atom are called ... ions

Ecosystems are clearly separated from one another. Where one ecosystem stops, another begins A: True B: False

Mass_mole relationship

What is the momentum of an 800-kg car | traveling at a velocity of 10 m/s? What is its momentum if it speeds up to 50 m/s?

How many grams of CuSO4 are there in 100.0 g of hydrate? How many moles?