Using the periodic table, which of the following elements has the most properties in common with calcium (Ca) ?

potassium (K)

magnesium (Mg)

scandium (Sc)

argon (Ar)

How many chiral carbon atoms does the neopentane (2, 2 - dimethylpropane) have?

Two chemical reactions are shown: Ca (OH) 2 → CaO + H2O 4K + O2 → 2K2O Which statement is true? A. Both are synthesis reactions. B. Both are decomposition reactions. C. A is a synthesis reaction, and B is a decomposition reaction. D.

7. Which of the following is NOT an example of a mechanical wave? a. Visible light b. Sound wave c. Seismic wave d. Water wave

What is true about working with burets? 1. You can easily break a buret if it is filled too high. 2. No graduation marks appear above the 0 mL mark. 3. The stopcock will open if you overfill the buret.

Vitamin A is a very large organic molecule composed of twenty atoms of carbon, one atom of oxygen and thirty atoms of hydrogen. How many atoms total are in TWO molecules of vitamin A. Select one: 84 68 34 102

A change of temperature equal to one kelvin is equal to a change of temperature of how many degrees celsius?

A solution has [h3o+] = 4.2*10-5 m. use the ion product constant of water kw=[h3o+][oh-] to find the [oh-] of the solution.

A. A rapid cooking method that uses high heat from a source located above the food.

What is the number of copper atoms in 1naira coin which weighs 7.39g assuming the material of which the coil is made is 86% copper Na=n/n number of moles/n

Which of the following statements are consistent with Rutherford's nuclear theory as it was originally stated? (A) The volume of an atom is mostly empty space. (B) The nucleus of an atom is small compared to the size of the atom.