Rubidium has a mass number of 87 and an atomic number of 37. how many electrons does it have?

Is it true that minerals come from orgainic

What happens when you boil water?

If a substance reacts with oxygen, the chemical reaction is most likely a combustion reaction. decomposition reaction. single replacement reaction. double replacement reaction.

A sample of aluminum is placed in a 25.0 ml graduated cylinder containing 10.0 ml of water the level of the water rises to 18.0 ml aluminum has a density of 2.70 g/mL what is the mass?

Given the formulas for the ionic compounds, draw the correct ratio of cations to anions (a) BaSO4, (b) CaF2, (c) Mg3N2, (d) K2O.

How many milliseconds (ms) are there in 3.5 seconds (s) ?

Which pair of organs, located in the lower back, collects liquid and waste from the blood? A. liver B. lungs C. kidneys D. skin

A caterpillar has an exoskeleton and feeds on many leaves before it makes a cocoon and becomes a butterfly. Which type of organism is a caterpillar? 1. an autotroph and an invertebrate 2. a heterotroph and an invertebrate 3.

Which of the following gases is produced by a storage battery when it's charging?

Ann and Carol each lift the timber with a force of 80 kg/m/s2. If they lift the timber a distance of 1.25 meters, how much work is each woman doing? Question 1 options: 64.00 J 78.75 J 81.25 J 100.00 J