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If the temperature changes in a chemical reaction, What has occurred?

A. There was no energy transfer.

B. Energy was transferred

C. Energy was destroyed

D. Energy was created

What are the coefficients for the reaction _Cl2O5 + _H2O → _HClO3 once it is balanced? A) 1, 1, 1 B) 1, 1, 2 C) 1, 2, 2 D) 2, 1, 1

True or False? The fatal 1930 incident in Muese Valley, Belgium, was associated with leakage of toxic chemicals from a former dump site.

The following diagram shows an amoeba and a plant. which of the following identifies the primary difference between the two organisims? Question 1 options: A) The amoeba can produce its own food. B) The amoeba contains only one cell.

Which type of friction keeps a skateboard's foot on the skateboard?

1. Determine the empirical formula of a compound containing 59.0% Na and 41.0% O by mass. (a) NaO (b) Na2O (c) NaO2 (d) Na2O3 (e) none of these

Which of the following changes would have no effect on the equilibrium position of the reaction below? 2 NOBR (g) 2 NO (g) + Br2 (g) A) adding NOBr.

An element consists of two isotopes. One with a mass of 79.95 amu and an abundance of 29.9%. The second isotope has a mass of 81.95 amu with an abundance of 70.1%. What is the molar mass of this element?

Write a short paragraph using the terms static electricity and electric discharge

Question 10 A 75.0 - mL sample of 1.54*10-2 M Na2SO4 (aq) is added to 75.0 mL of 1.22*10-2 M Ca (NO3) 2 (aq). Part A What percentage of the Ca2 + remains unprecipitated? Express your answer using two significant figures.

How many milliliters of 0.50 M KOH are needed to exactly neutralize 10 milliliters of of 1.5 M HNO3 A. 5.0 mL B. 12 mL C. 25 mL D. 30 mL