How many neutrons does a beryllium atom with four protons and a mass number of nine?

Which of the following is the correctly balanced equation for the reaction of a Ca (OH) 2 and HNO3

Liquid X has a pH of 7 and Liquid Y has a pH of 8.5. Which statement is true? Liquid X is a base and Liquid Y is an acid. Liquid X is an acid and Liquid Y is a base. Liquid X is neutral and Liquid Y is a base.

Why does chemistry affect all aspests of life and most natural events

Trichloromethane consists of 10.05% carbon. 0.83% hydrogen and 89.12% chlorine. if uts relative molecular mass is 119.5g. find its molecular formula

What two ways can light behave as?

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Four properties of water are listed. 1. It reacts with halogens to form oxygen gas as one of the products. 2. It is transparent and tasteless in its pure form. 3. It freezes at a temperature of 0 °C and lower. 4.

According to the equation W = Fd which statement tells what can be done to reduce the amount of force needed to accomplish work?

A rigid tank contains an ideal gas at 40°C that is being stirred by a paddle wheel. The paddle wheel does 150 kJ of work on the ideal gas.

Which compound is an example of a binary ionic compound? Question 6 options: H2O H2SO4 MgF2 SF6