The universe is estimated to be how old?

A. 2 million years

B. 4 million years

C. 4.6 billion years

D. 13 to 14 billion years

What can be determined from examining the fossil record? A. when changes to the diversity of life forms occurred B. when many life forms first appeared on earth C. when many life forms became extinct D. all of the above

Substance formed by the chemical combination of elements is called

Measuring acceleration requires appropriate units. Which unit is used to measure acceleration? a: m/s b:N c:m/s2 D: kg·m/s

At a certain temperature, the solubility of strontium arsenate, sr3 (aso4) 2, is 0.0550 g/l. what is the ksp of this salt at this temperature?

5 mL of ethanol has a mass of 3.9 grams and 5.0 mL of benzene has a mass of 4.4 grams, which liquid is denser?

How does temperature affect molecules

The color of Benedictâs solution is blue. What color does it change to in high sugar concentration?

What functional groups of the emulsifying agent provide the hydrophilic character? Do these groups affect the pH?

Which element has atoms that can form single, double, and triplecovalent bonds with other atoms of the same element? (1) hydrogen (3) fluorine (2) oxygen (4) carbon

Which of the following statements best describes the basic structure of an atom? Electrons and protons are in motion around a nucleus that contains neutrons Neutrons are in motion around a nucleus that contains protons and electrons Protons are in