What is the oxidation number of O in PO 3-?
A. O
B. -1
C. - 2
D. -3
E. None...
Answers: 2
Chemistry, 23.06.2019 10:00
1.9 mol hcl and 3.9 mol naoh react according to the equation hcl + naoh ββ nacl + h2o . if the limiting reactant is hcl, calculate the amount of nacl formed.
Answers: 1
Chemistry, 23.06.2019 17:10
Two changes are described below. a green banana turns yellow and ripens. a layer of rust forms on an iron nail. which statement is true about the two changes? a) both are chemical changes because new substances are formed. b) both are physical changes because only the physical state of the substances change. c) a is a physical change due to a change of state, but b is a chemical change because new molecules are formed. d) a is a chemical change due to a change of state, but b is a physical change because new molecules are formed.
Answers: 3
Chemistry, 23.06.2019 19:00
Question 1 how do an ionic bond and a covalent bond differ? an ionic bond is an attraction between oppositely charged ions. a covalent bond is a sharing of electrons between atoms. a covalent bond is an attraction between oppositely charged ions. an ionic bond is a sharing of electrons between atoms. there is no difference. both an ionic bond and a covalent bond share electrons. there is no difference. both an ionic bond and a covalent bond are attractions between oppositely charged ions. question 2 what is the definition of a covalent bond? a bond between two positive ions a bond between two negative ions a bond between a positive and a negative ion a bond between two atoms question 3 what is a bond called that shares electrons between two neutral atoms? covalent bond ionic bond metallic bond polar bond question 4 water (h2o) is composed of the same elements as carbon monoxide (co). how do their properties compare? they have different properties because the arrangement of atoms is different. they have the same properties because they have the same atoms. they have different properties because they have different atoms. they have the same properties because they have the same arrangement of atoms. question 5 what is the definition of a chemical bond? a mutual attraction between the nuclei and electrons in two different atoms a mutual attraction between the nuclei and electrons in a single atom a mutual repulsion between the nuclei and electrons in two different atoms a mutual repulsion between the nuclei and electrons in a single atom
Answers: 1
Chemistry, 24.06.2019 00:30
When a pendulum is held high and taut and then is released, the pendulum begins to swing what's the correct order of the energytransformations in this example? (pe stands for potential energya.gravitational peelastic pethermal energyb.gravitational pe - kinetic energythermal energyc.kinetic energyelastic pe - thermal energyd.kinetic energy-gravitational pethermal energye. thermal energy - gravitational pekinetic energy
Answers: 1
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