What is the melting point of the substance represented by the complete heating curve below? a line graph showing the heating curve of a substance being heated from the solid phase all the way to the gas phase. the substance starts at a temperature around 0°c and ends at a temperature around 70°c. first, there is an incline with a positive slope from 0°c to 20°c, followed by a horizontal region at 20°c. then there is another incline with a positive slope from 20°c to 60°c, followed by another horizontal region at 60°c. the end of the heating curve shows another incline with a positive slope from 60°c to 70°c.
a. 0°c
b. 20°c
c. 40°c
d. 60°c

Consider three unlabeled bottles, each contain small pieces of one of the following metals. - magnesium - sodium - silver the following reagents are used for identifying the metals. - pure water - a solution of 1.0 molar hcl - a solution of concentrated hno3 (a) which metal can be easily identified because it is much softer than the other two? describe a chemical test that distinguishes this metal from the other two, using only one of the reagents above. write a balanced chemical equation for the reaction that occurs. (b) one of the other two metals reacts readily with the hcl solution. identify the metal and write the balanced chemical equation for the reaction that occurs when this metal is added to the hcl solution. use the table of standard reduction potentials (attached) to account for the fact that this metal reacts with hcl while the other does not. (c) the one remaining metal reacts with the concentrated hno3 solution. write a balanced chemical equation for the reaction that occurs. (d) the solution obtained in (c) is diluted and a few drops of 1 m hcl is added. describe what would be observed. write a balanced chemical equation for the reaction that occurs.

Consider the nuclear equation below. 239/94 pu—-> x+ 4/2 he. what is x?

What type of energy do chemical bonds have? what type of energy is it converted to during chemical reactions? question 15 options: chemical bonds have kinetic energy, which is converted to potential energy during chemical reactions. chemical bonds have electric energy, which is converted to potential energy during chemical reactions. chemical bonds have heat energy, which is converted to kinetic energy during chemical reactions. chemical bonds have potential energy, which is converted to heat energy during chemical reactions.