Chemistry, 06.09.2019 19:30 sheram2010
You volunteer for chalkboard cleaning duty and you get to work with the erasers. as you rub the dust off of the chalkboard, white chalk dust enters the air and makes you cough. as you clean the chalkboard with the eraser, are you causing a physical change or a chemical change ? explain your answer .
Answers: 3
Another question on Chemistry
Chemistry, 22.06.2019 21:00
Once similarity and one difference between a mixture of elements and a mixture of compounds
Answers: 3
Chemistry, 22.06.2019 23:30
If it is an isoelectronic series select true, if not select false. o2-, s2-, se2-, te2- na+, k+, rb+, cs+ n3-, p3-, as3-, sb3- ag, cd+, sn3+, sb4+ f-, cl-, br-, i- f-, ne, na+, mg2+ s2-, s, s6+
Answers: 1
Chemistry, 23.06.2019 01:00
Imagine if during the cathode ray experiment, the size of the particles of the ray was the same as the size of the atom forming the cathode. which other model or scientific observation would have also been supported? 1. this would support dalton's postulates that proposed the atoms are indivisible because no small particles are involved. 2. this would support bohr's prediction about electrons moving in orbits having specific energy. 3. this would support bohr's prediction about electrons being randomly scattered around the nucleus in the atom. 4. this would support dalton's postulates that proposed that atoms combine in fixed whole number ratios to form compounds.
Answers: 1
Chemistry, 23.06.2019 13:00
Which of the following statements is true about both nuclear fusion and nuclear fission? they occur in the sun. heavy atoms are split. two light nuclei combine. some mass changes into energy.
Answers: 1
You know the right answer?
You volunteer for chalkboard cleaning duty and you get to work with the erasers. as you rub the dust...
Questions
Chemistry, 27.06.2020 03:01
Mathematics, 27.06.2020 03:01
History, 27.06.2020 03:01
