Which list of elements contains only metals?

a. helium, carbon, gold

b. sodium, chromium, copper

c. iodine, iron, nickel

d. phosphorus, nitrogen, oxygen

Doreen Schmidt is a chemist. She needs to prepare 28 ounces of a 12 % hydrochloric acid solution. Find the amount of 14 % solution and the amount of 7 % solution she should mix to get this solution.

Sam is heating water on the stove for his science experiment. How will he know when it is boiling? A. It will be warm. B. There will be bubbles forming in the water. C. The water will turn bluish. D. The temperature will rise to 80 degrees Celsius.

Which of these scenarios involve a reaction that is at equilibrium? A. The reaction is producing more products than reactants. B. The reaction is producing more reactants than products. C. The amount of products and reactants is changing. D.

A butterfly has a wingspan of 77 mm and a height of 7 cm. Which is greater the wingspan or the height of butterfly?

What did Bohr's model of the atom include that Rutherford's model did not have?

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