An instrument used to measure and record ground movements during an earthquake is called a (n)

a. seismograph.

b. laser-ranging device.

c. creep meter.

d. moment magnitude scale.

Explain why a magnesium atom is smaller than atoms of both sodium and calcium.

When the compound, Na2S, is mixed with water, the Na2S is: soluble because all Na+1 compounds are soluble in water insoluble because most Na+1 compounds are insoluble in water soluble because all S-2 compounds are soluble in water insoluble because

In a constant-pressure calorimeter, 50.0 mL of 0.320 M Ba (OH) 2 was added to 50.0 mL of 0.640 M HCl. The reaction caused the temperature of the solution to rise from 23.76 °C to 28.12 °C.

If a solid substance sinks in water, can you say for sure that the liquid and gas phase of the same substance will also sink?

Clarify the compounds as strong acid or weak acid HNO3, H2SO4, H2CO3, HCl, HF

A student states the following: "Since acetone (nail polish remover) evaporate more readily than water, one would assume that acetone has weaker intermolecular forces than water." Evaluate their claim. (2 sentences)

A catalyst can only be used once. True False

On what basis do we distinguish between substances and separate them from one another?

What is the net ionic equation for the following reaction? H2CrO4 + Ba (OH) 2

How does improving food-storage facilities make farming more sustainable? A. It decreases the amount of water needed. B. It keeps food from rotting as quickly and being wasted. C. It decreases the amount of land needed. D.