As a star gives off energy in a thermonuclear reaction, the mass of the star

1.

decreases

2.

increases

3.

remains the same

According to the graph, which of the following substances is least soluble in 100 grams of water at 50°C? 1. KCI 2. Nacl 3. NHACI 4. HCI

What are the characteristics of a neutron? 1. It has no charge and no mass. 2. It has no charge and a mass of 1 amu. 3. It has a charge of + 1 and no mass. 4. It has a charge of + 1 and a mass of 1 amu.

Use the reaction: 2AgNO3 (aq) + H2SO4 (aq) → Ag2SO4 (s) + 2H2O (l) What volume of 0.123 M AgNO3 (aq) is needed to form 0.657 g of Ag2SO4 (s) ? (A) 53.4 mL (B) 10.7 mL (C) 17.1 mL (D) 34.2 L (E) 34.2 mL

Consider the equation: 4AI+30² → 2AI²O³ Is this equation balanced? Why or why not?

Consider the letters in the word chemistry. use them to make as many word " compounds " as is possible with 9 elements.

What device changes mechanical energy into electrical energy? Question 4 options: transformer generator copper wire light switch

Reaction rates are affected by how often the particles collide true false

A 25 N and 5 N force pull to the right. Friction is 10 N. If the object is 5 kg, find the net force and acceleration.

What properties of matter are intensive independent of their size

What is the density of an object having a mass of 8.0g and a volume of 25cm3