Never trust atoms, they make up everything
Which particles reside in the center of the atom? What is that center called?
Protons and neutrons.
Nucleus.
Carbon-14 is a beta emitter. What does carbon-14 decay into?
Nitrogen-14.
a name that means, atoms bonded together
molecule
ability of h2o to form hydrogen bonds with other polar molecules.
(when water sticks to the glass on a tube)
adhesion.
Negatively charged particles are called...
Electrons
there was a 2.5g sample of Strontium-90 formed in 1960. The half-life of strontium-90 is 28 years. in how many years will only 0.625g of this strontium-90 remain?
56 years.
why do atoms bond?
what causes a 'reverse meniscus'
surface tension
Define isotopes.
atoms of the same element with different numbers of neutrons in the nucleus.
How many moles of sodium hydroxide are needed to make 2.0 L of a 1.5 M solution?
3.0 moles
1) bonds formed between metals and non-metals (sometimes, between metals and metalloids) (NaCl, KF)
2) bonds formed between non-metals (sometimes non-metals and metalloids) (H2O, CH4)
1) ionic
2) covalent
what happens to the H-bonds when water is heated?
they break apart.
Which particle (alpha, beta, gamma) has an effect on radioactive decay of...
A -4
z -2
Alpha particles.
what is the pH of a 0.0235 M HCl solution?
Hint...
1.629
1) bond that forms cations/anions
2) bonds that occur between polar molecules (hint)
3) bonds between non-polar molecules (hint)
1) ionic
2) hydrogen bonding
3) van der waals interactions
True or False: water is more dense when it freezes
False.