Which of these is an example of a physical change

baking a cake

toasting bread

grinding pepper

lighting up a grill

An element has five valence electrons available for bonding. This element is most likely which of the following boron phosphorus tin tellurium

A pharmacist has a prescription for 30 ml of an eye drop that is to contain benzalkonium chloride 1:750 as a preservative. on the shelf the pharmacist finds 17% benzalkonium chloride.

How does weathering break down or change rocks

Why would it have been wrong to write Li2SO4 as lithium sulfur oxide?

Which piece of information is not necessary to calculate the force of gravity between two objects, A and B? A. The mass of object A. B. The mass of object B. C. The velocities of A and B. D. The distance between A and B.

If a net force of 5.0 forward acts on a 0.60 kg toy car, what is it's acceleration?

Which physical method can be used for obtaining a sample of salt from a small beaker of salt water? boiling freezing chromatography sorting

A gas expands in volume from 26.7 to 89.3 mL at constant temperature. Calculate the work done (in joules) if the gas expands (a) against a vacuum, (b) against a constant pressure of 1.5 atm, (c) against a constant pressure of 2.8 atm. (1L⋅atm=101.

Beta particles are emitted from radioactive atom p when it disintegrates spontaneously to form non radioactive atom q. which of these statements is most likely correct about atom p and atom q?

What should I do for the science fair?