Heated bricks or blocks of iron were used long ago to warm beds. A 1.49 - kg block of iron heated to 155 Celsius would release how many joules of heat as it cooled to 22 Celsius?

What element has 3 valance electrons and 4 energy levels

why is the concentration of helium increased in some gas mixtures that divers breath in order to reduce the partial pressure of oxygen?

Which of the following is not a reason to use an alloy instead of a pure metal? Brass is more malleable that pure copper. Sterling silver is stronger than pure silver. Cast iron is more brittle than pure iron. Bronze is tougher than pure copper.

Describe the" fear appeal" and how it's used in public messaging. Give an example or create your own public health message using the fear appeal.

In a chemical reaction how does the mass of the reactants compare with the mass of the products?

How much is 35° C in F?

Which describes a precipitate in a chemical reaction? a a gaseous product formed from aqueous reactants b a solid reactant that forms aqueous product c a gaseous reactant that forms aqueous products d a solid product formed from aqueous reactants

Prepare a solution that is 0.1 M acetic acid and 0.1 M sodium acetate by measuring out 5.0 mL of the 1.0 M acetic acid solution and 5.0 mL of the 1.0 M sodium acetate solution in a 100 mL graduated cylinder, diluting the 10.

Which element has an ion that is smaller than an ion of calcium?

Which factor is responsible for the weak attraction between diatomic molecules of the halogens (group 7A) ? A) Hydrogen bonding B) Ionic bonding C) Dipole interactions D) London dispersion forces