Which of the following illustrations show atoms of the same element? (Yellow=electrons, red=protons, gray=neutrons).

You need to determine the mass of an aqueous solution. You determine the mass of your 10.0 mL graduated cylinder to be 23.731 g. After adding a volume of 3.12 mL of solution to the cylinder, you reweigh it and determine the new mass to be 26.414 g.

Why do North and South Pole have different winter times?

How many neutrons does an element have if its atomic number is 48 and its mass number is 153?

What is the atomic for k

If you start with 13.4g of c3h8 and 4.35g of o2 determine the limiting reagent

When DNA is replicated, it is necessary for the two strands to "unzip" temporarily. Choose which bonding type is most appropriate for holding the strands together in this way.

Match the grams of each element or compound to the corresponding number of moles of that element or compound. 1. 20.0g H 0.011 moles 2. 0.50 g Na 20.0 moles 3. 2.0 x 102 mg H2O 0.022 moles

Select the name of the period 4 transition element that forms a 3 + diamagnetic ion.

What is the mass of 1.70 moles of magnesium chloride, MgCl2?

A 42.0g sample of compound containing only C and H was analyzed. The results showed that the sample contained 36.0g of C and 6.0g of H. Which of the following questions about the compound can be answered using the results of the analysis?