Which molecule has a tetrahedral arrangement of electron pairs but is not a tetrahedral molecule?

methane

water

carbon dioxide

boron trifluoride

How many calories of are required to heat 731 grams of water from 35°c to 83°c? (assume that the specific heat of water is 1.00 cal/g·°c) ?

When two substances come together in a mixture, they? A. chemically combine B. physically intermingle C. physically separate

What is the density of a marble that has a mass of 3.023 g and displaces 2.5 mL of water?

Initial volume is 2.3L, initial temperature 150°C and initial pressure 2.5atm. Temperature increases to 300°C and pressure doubles. The new volume is ... ?

How does the nucleus of an atom change after beta decay? a. The nucleus remains the same b. The nucleus gains an electron. (c.) The nucleus loses a neutron. d. The nucleus loses a proton

If you remove all the particles from a wooden table, what remains

Which of the following is the best description of covalent bonding? 1. Bonding that occurs between elements with similar electronegativities, and with transfer of electrons. 2.

You are asked to smell a solution in a beaker. what is the best way of doing this?

The specific gravity of iron is 7.87, and the density of water at 4.00 ∘C is 1.00 g/cm3. You can use this information to find the density of iron. Find the volume occupied by 4.50 g of iron.

The volume of a gas is 93 ml when the temperature is 91? c. if the temperature is reduced to 0? c without changing the pressure, what is the new volume of the gas?