Sewing quilts is an American tradition that dates from the pioneer days. Quilts are usually made with 100% cotton fabric. Different fabrics behave differently when they are washed, so sewing multiple types of fabrics together can cause the seams to pucker or damage the quilt over time. Which answer best explains why most quilts are made entirely out of cotton? A. Different fabrics can only be dyed certain colors. B. Other fabrics do not have the property of being warm and soft. C. Different fabrics interact differently with heat, soap, and water. D. Other fabrics would be more difficult to sew together.

When 225mg of anthracene, c14h10(s), was burned in a bomb calorimeter the temperature rose by 1.75k. calculate the calorimeter constant. by how much will the temperature rise when 125mg of phenol, c6h5oh(s), is burned in the calorimeter under the same conditions? (δch< (c14h10,s)=–7061 kj mol−1.)

The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.

This drawing shows a human body system. what is the primary function of this body system?