Which is the best description of what happens in a chemical reaction? A. Atoms rearrange. B. Atoms change into other atoms. C. Matter is destroyed. D. Matter is formed.

What is the first step in the scientific method? A. form a hypothesis B. illustrate the process C. observe and ask questions D. draw conclusions

Position in the periodic table. 1. What is the difference between a period and a group on the periodic table of elements? 2. How does the number of valence electrons in sodium (Na) compare to the number of valence electrons in calcium (Ca) ? A.

Michelle has a beaker containing NaCl. What is in Michelle's beaker

You have prepared a saturated solution of x at 20∘c using 37.0 g of water. how much more solute can be dissolved if the temperature is increased to 30∘c?

The is a measure of how acidic or basic a solution is.

A student went to the dentist and found out that he had a cavity. He always brushes his teeth twice a day, so he didn't understand how he got a cavity.

A force of 8,480 n is applied to a cart to accelerate it at a rate of 26.5 m/s2. what is the mass of the cart? 865 kg 320 kg 12.1 kg 3.12 kg

Within a group, which period, top or bottom is likely to contain atoms with the larger radius?

Write the equation for the fusion of two hydrogen-1 atoms.

23.9 km + 15 km Calculate this problem and report the answer with the correct number of significant figure