Question 1(Multiple Choice Worth 4 points) (04.03 LC)
Which of the following steps can be used to identify a double replacement reaction?
O Check whether the products are salt and water.
O Check whether the reactants are an acid and a base.
O Check if the ions of two compounds exchange places.
O Check if one element replaces another element in a compound.

What royal scientist used the 29th day of frozen vapor to encounter elements for mastering new culinary creations?

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.