Which metal is the most abundant in the Earth's crust? copper (Cu) aluminum (Al) iron (Fe) zinc (Zn)

Explain how density can be used to determine if the golden penny is made of solid gold.

When a car is going downhill, the driver must apply more pressure on the brakes to stop than if the car were on level ground. why?

How does omitting triethanolamine affect the properties and appearance of the hand lotion?

You've been asked to make a solution of sodium hydroxide with a concentration of 1.5 molarity and a volunteer of 150ml. How many grams of sodium hydroxide do you need?

Which statement describes science? 1 It lacks a process. 2 It is not updated often. 3 It is supported bye evidence

Explain why many compounds that contain one or more hydrogen atoms are not classified as arrhenius acids

pure substance x is a green powder. when heated, it gives off a gas and changes to a black powder. is substance x an element or a compound? give reasons

What amount (moles) is represented by each of these samples? a. 20.0 mg caffeine, c8h10n4o2 b. 2.72 1021 mo?

A sample of gas occupies 40.0 mL at - 123°C. What volume does the sample occupy at 27°C if the pressure is held constant? V1T2 = V2T1 Don't forget to convert temperature to kelvin! Group of answer choices 8.80 mL 20.0 mL 80. ML 182 mL

How much Na2Co3 is needed to produce 35g of Na2Co3?