Element A has a half-life of 10 days. A scientist measures out 200 g of this substance. After 30 days has passed, the scientist reexamines the sample.

How much Element A will remain in the sample?

50 g

25 g

12.5 g

100 g

Select all of the statements that are examples of technology in science. chemists using a computer program to analyze data from their experiments physicists using a water tank to observe the way waves interact with a model vehi biologists writing

Oh no! The thermometer punctured a hole in the bottom of the coffee cup, and water is spilling out. Check all actions you would take. Throw the broken pieces away. Use the punctured cup as the outside cup, not the inside cup.

A molecular biologist measures the mass of cofactor a in an average yeast cell. the mass is 74.06 pg. what is the total mass in micrograms of cofactor a in a yeast colony containing 105 cells

If litmus paper is dipped in a very acidic and then in a basic what will happen

What is the mass of 25.0 grams of HF

Why are water storage tanks usually built on towers or hilltops?

What is convection cell

One example of a decomposition reaction is the electrolysis of water. the chemical reaction can be expressed by the equation 2 h2o →2 h2 o2. the reactant (s) of this chemical reaction is/are?

When the positive ion of one compound replaces the positive ion of another compound?

A 2.00 L container of gas has a pressure of 1.00 atm at 300 K. The temperature of the gas is halved to 150K, and the measured pressure of the same 2.00 Liter sample is 0.420 atm.