Zinc (Zn) reacts with hydrochloric acid (HCI) and produces hydrogen

gas. This is an example of:

A. A new substance is formed

B. A change in composition at the atomic level.

C. All of these

D. A chemical change.

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Which of the following statements about tautomers is true? Group of answer choices Tautomers differ in the position of a double bond and a carbon atom. Tautomers differ in the position of a single bond and a carbon atom.

Suppose the heat of neutralization had ben determined using a glass beaker instead of a polystyrene coffee cup. how would the measured value have been affected?

Which of the following bonds is the most polar in nature: (1) Cl2 (2) HCl (3) HBr (4) HI

An excess of hydrogen ions in the body fluids can have fatal results because this can A) break chemical bonds B) disrupttissue functions C) change the shape of large complex molecules, rendering them nonfunctional D) all of the answers are correct

What is the molality of a solution that contains 63.0 g HNO3 in 0.500kg H2O?

A 25 N and 5 N force pull to the right. Friction is 10 N. If the object is 5 kg, find the net force and acceleration.

What properties of matter are intensive independent of their size

What is the density of an object having a mass of 8.0g and a volume of 25cm3

What is a Cilla? (In drawing)

Which term names the group of organisms able to interbreed and produce fertile offspring?