Which of the following is an example of an irreversible physical change? A. Melting a piece of lead B. Boiling water C. Sharpening a pencil D. Dissolving sugar into water

Martina has a sample of an unknown substance, she measures the substance, its mass is 13.5 grams, and its volume is 5cm^3 which metal might her sample be made of? silver density: 10.49 g/cm^3 copper density: 8.96 gm/cm^3 iron density: 7.

How many neutrinos does an element have if it's atomic number is 47 and it's mass number is 169

A student places two charged objects near each other. the objects repel each other. the student concluded that the objects must both be negative. do you agree? explain.

Which of the following would be expected to have chemical properties similar to those of sulfur? 1. Mg 2. F 3. Ar 4. Si 5. P 6. Se

Which of the following is an example of a solution? A. None of these B. Mercury, liquid at room temperature C. Sugar dissolved in tea D. A mixture of rock granules and bits of shell known as sand

10) What does mRNA copy and carry the code to produce? (1pt) a) DNA b) Proteins

How many neutrons are in an atom of molybdenum-96 (Mo-96)

One mole of any gas takes up how much space at stp

A proton moves through a region of space where there is a magnetic field B = (0.45i + 0 38j) T and an electric field E = (3.0 i - 4.2 j) x 10^3 V/m. At a given instant, the proton's velocity is V = (6.0 i + 3.0 j - 5.0 K) x10^3 m/s.

Why do they put flexible connections in the road on a bridge? Put it into five complete sentences