How many substances does a pure piece of matter contain?

A. 0

B. 1

C. 2

D. 3

State the meaning of the term redox. Can't find the perfect answer.

The levels of biological organization for most multicellular organisms

Samuel adds a teaspoon of salt to a glass of water. He notices that the song disappears. Samuel takes a sip to discover that the water taste salty. What kind of change has occurred?

Which of the following statements is true? Question 1 options: Nonmetals lose electrons to become cations. Metals gain electrons to become cations. Metals lose electrons to become cations. Nonmetals gain electrons to become cations.

What are the wind belts that extend 60 degrees latitude

5.00 L of a gas is collected at 100K and then allowed to expand to 20.0 L. What must the new temperature be in order to maintain the same pressure? A. 400 °C B. 127 °C C. 223 °C D. 627°C

Before the initial explosion was the matter hot or cold

Which of the following atoms has seven valence electrons? chlorine (Cl) nitrogen (N) manganese (Mn) oxygen (O)

A.) During an experiment, a student adds 2.90 g of CaO to 400.0 mL of 1.500 M HCl. The student observes a temperature increase of 6.00 °C. Assuming the solution/'s final volume is 400.0 mL, the density if 1.00 g/mL, and the heat capacity is 4.

Consider the ionic compound magnesium acetate. How many electrons does the magnesium ion have