According to the periodic table, how many protons are in the nucleus of one atom of the element iron?

a. 9

b. 26

c. 55.85

d. 77

A 10.0-gram sample of liquid water at 23.0°C absorbs 209 joules of heat. What is the final temperature of the liquid water sample? a) 5.0°C b) 28.0°C c) 18.0°C d) 50.0°C

How many liters of H2 gas would you have if you have 2.52 moles of H2?

30.0 mL of 0.50 M NaOH to neutralize 15.0 mL of HNO3, what is the concentration (molarity) of the HNO3?

Which does not affect chemical equilibrium

Which of the following parts of a circuit would be considered a load? Justify your answer by explaining your choices • light • switch • motor • battery

Which indicator will be the same color in hydrochloric acid as it is in pure water? 1. methyl orange 2. phenolphthalein 3. bromcresol green

Based on your knowledge of energy resources conservation, which of the following statements is true? a) Manufacturers can increase a light bulb's energy efficiency by using technology that decreases the amount of electromagnetic energy the bulb

Ammonia (nh3 (g), hf = - 46.19 kj/mol) reacts with hydrogen chloride (hcl (g), hf = - 92.30 kj/mol) to form ammonium chloride (nh4cl (s), hf = - 314.4 kj/mol) according to this equation:

How does an electromagnet create a magnetic field

Magnetism, reactivity, and fluorescence are three special properties used to identify minerals. true or false