Questions and task on the subject: Chemistry

Chemistry

Chemistry, 12.08.2022 14:00

You are given 100 g of a compound. The compound is composed of 37% hydrogen and 63% oxygen. How many grams oxygen are present in the 100 g sample? Select one: a. 37 g b. 100 g c. 2...

Chemistry

Chemistry, 11.08.2022 06:10

Calculate the number of atoms in 3 mol helium...

Chemistry

Chemistry, 11.08.2022 04:40

Write a careful description of a metal or an alloy . Use the correct scientific terms. Explain which properties of metals are particularly suited to the function it has. a) The n...

Chemistry

Chemistry, 11.08.2022 01:40

One way to determine the age of the earth is to measure the ratio of certain radioactive elements to their more stable forms. By comparing the amount of radioactive form of an obje...

Chemistry

Chemistry, 09.08.2022 03:10

A piece of copper absorbs 5000 J of energy and undergoes a temperature change from 100 °C to 200 °C. What is the mass of the piece of copper? Group of answer choices...

Chemistry

Chemistry, 08.08.2022 22:10

In nature, X contains two isotopes with mass numbers 79 and 81. Calculate the percentage abundance of the isotopes ⁷⁹X and ⁸¹X....

Chemistry

Chemistry, 08.08.2022 17:40

6) What is the pH of a solution with [H3O+] = 1 × 10-9 M? A) 1.0 × 10-5 B) -9.0 C) 5.0 D) -5.0 E) 9.0...

Chemistry

Chemistry, 07.08.2022 20:30

Increased total serum lactic dehydrogenase (LD) activity, confined to fractions 4 and 5 is most likely to be associated with: A. Pulmonary infarction B. Hemolytic anemia C. Myocard...

Chemistry

Chemistry, 07.08.2022 14:00

Write the balanced redox reaction Fe2+ and MnO4...

Chemistry

Chemistry, 06.08.2022 18:20

Find the amount of heat energy needed to convert 400 grams of ice at -38°C to steam at 160°C. Group of answer choices A. 246840 Joules B. 159984 Joules

Chemistry

Chemistry, 06.08.2022 16:40

Hypernatremia due to excess water loss: A. Diabetes insipidus B. Dialysis fluid excess C. Hyperaldosteronism D. Older persons...

Chemistry

Chemistry, 06.08.2022 16:10

Write equations that show NH3 as both a conjugate acid and a conjugate base....

Chemistry

Chemistry, 06.08.2022 06:20

What is the pH of a 0.0100 M sodium benzoate solution? Kb (C7H5O2-, ) = 1.5 x 10^-10 A) 0.38 B) 5.91 C) 8.09 D) 9.82 E) 13.62...

Chemistry

Chemistry, 05.08.2022 02:20

In Keq expressions, "[]" represents of reactants and products. a)concentration b)temperature c)moles d)mass...

Chemistry

Chemistry, 05.08.2022 01:00

Can someone help me create energy diagrams for these three reactions? ...