A sample of a hydrate has a mass of 5.026 g. After it is heated, it has a mass of 3.492 g. What is the percentage by mass of water in the hydrate?

1. 19.40%

2. 27.92%

3. 30.52%

4. 69.48%

Use the pump to add 250 molecules of the heavy species gas. How does the temperature change? Type the correct answer in each box. Use numerals instead of words. When you begin to add the molecules, the temperature inside the container is K.

Witch reaction is a single replacement reaction

A change in color, such as rusting of metal, is a sign that ... A.) A chemcal change is taking place. B.) A physical change has just taken place. C.) Oxygen is present D.) Organic chemicals are present

Which of the following is an example of a longitudinal wave

One mole of water contains 16 grams of oxygen atoms.

Which formula id correctly paired with its name? A. MgSO↓ = magnesium chlorine B. FeO = iron (|||) oxide C. K↓2O = Phosphorus dioxide D. CuCI↓2 = copper (||) chloride

Which of the following correctly explains the role of enzymes in biochemical reactions? A) Enzymes provide energy in the form of ATP to lower the activation energy needed for the reaction.

How does being a landlord relate to chemistry in any way

Element m has an ellectronegativity of less than 1.2 and reacts with bromine to form the compound MBr2. Element M could be?

Which situation describes evidence of a chemical change? A. When food color is added to water, it changes color. B. A solid changes into liquid when heated. C. A solution feels warm after a cool solid is added to it. D.