In a lab, the mass of object A is 65 kg. Object A weighs

0.15 N

6.63 N

637 N

cannot be determined

What is the very small center core of an atom is called?

An atom of oxygen has an atomic number of 8 and a mass number of 18. How many of each type of subatomic particle does it contain?

The force that moves sediment in a landslide or mudflow is _.

A student mixes 100 mL of 0.50 M NaOH with 100 mL of 0.50 m HCl ina styrofoam cup and observes a temperature increase of delta T1. When she repeats this experiment using 200o mL of each solution, she observes a temperature change of delta T2.

A student is instructed to make 0.250 liter of a 0.200 m aqueous solution of ca (no3) 2. what is a correct numerical setup for calculating the total number of moles of ca (no3) 2 needed to make 0.250 liter of the 0.200 m calcium nitrate solution?

Which statement about neutrons is true? A. Neutrons travel around the nucleus of an atom. B. The number of neutrons in an atom always equals the number of electrons. C. Neutrons have less mass than electrons. or D. A neutron has no charge.

Of these gases, which has the fastest-moving molecules (on average) at a given temperature?

What is the oxidation number for zinc? How does zinc's electron configuration account for this oxidation number?

Which of the following experimental observations proved that the idea of matter and mass being evenly distributed in an atom was flawed? A. Less than 1% of the alpha particles went un-deflected through the gold foil. B.

Calculate the energy E of a sample of 3.50 mol of ideal oxygen gas (O2) molecules at a temperature of 310 K. Assume that the molecules are free to rotate and move in three dimensions, but ignore vibrations.