CHEMISTRY HIGH SCHOOL

Oil flows upward in the wick of a lantern because of the liquid property calledA. density.
B. meniscusity.
C. viscosity.
D. capillarity.

Answers

Answer 1
Answer: B
Meniscusity the convex or concave upper surface of a column liquid, the curvature of which is caused by surface tension
Answer 2
Answer: Capillarity. Capillary action is what causes anything with a wick to work, think about when you stick the corner of a paper towel in water, the water soaks up the paper towel.

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If 37.4 grams of water decompose at 297 Kelvin and 1.30 atmospheres, how many liters of oxygen gas can be produced? Show all of the work used to solve this problem. 2H2O (l) yields 2H2 (g) + O2 (g)

Answers

To determine the liters of oxygen gas, we convert the 37.4 grams of water to moles, which is 2. 078 moles. The moles oxygen is half the moles of water which is equal to 1.039 moles. Using ideal gas equation, PV=nRT, we get the volume from the given temperature and pressure. The volume is 19.49 liters.

In which of these substances are the molecules probably moving most quickly?solid iron at −45°C
solid iron at 300°C
liquid iron at 1600°C
liquid iron at 1800°C

Answers

The substance with molecules that are probably moving most quickly is liquid iron at 1800°C. This is because the particles of the liquid iron can move or slide past each other due to the small space available for movement. It cannot be compressed further due to the repulsive forces that acts between them. And also, the temperature is increases which causes for more thermal vibration of atoms.

Answer:

The answer is D

Explanation:

What did John Dalton contribute to the understanding of the atom?

Answers

John Dalton contribute to the understanding of the atom that all matter was composed of atoms, indivisible and indestructible building blocks.

While all atoms of an element were identical, different elements had atoms of differing sizes and mass.

What is an atom?

An atom is a particle of matter that uniquely defines a chemical element.

An atom consists of a central nucleus that is usually surrounded by one or more electrons.

Dalton's atomic theory was the first complete attempt to describe all matter in terms of atoms and their properties.

Dalton based his theory on the law of conservation of mass and the law of constant composition.

The theory states that all matter is made of atoms, which are indivisible.

(1) All matter is composed of tiny, indivisible particles, called atoms, that cannot be destroyed or created.

(2) Each element has atoms that are identical to each other in all of their properties.

Learn more about the atom here:

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Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass.

Which is true of transition metals when moving from left to right on the periodic table?The d sublevels are not filled across the period.
The cation radii become larger across the period.
Atomic radii increase slightly and then start to decrease.
Atomic radii decrease slightly and then start to increase.

Answers

The correct option is D.

Transition metals are those metallic elements that are located in the central block of the periodic table. They exhibit various valency states and they generally have various colors. The atomic radius of an element refers to the measure of the size of its atom. For transition metals, their atomic radii decrease slightly and then start to increase, when one is moving from the left to the right of the periodic table.

Answer : The correct option is, Atomic radii decrease slightly and then start to increase.

Explanation :

Transition metals : It is defined as the element whose atom is ground state or ion in one of the common oxidation states, has incomplete d-subshell.

The general trend of atomic radii of transition metals is :

Generally the atomic radii of d-block elements in a series decreases with increase in atomic number but decreases in atomic size is small after midway that means almost remains same and at the end of the period there is a slight increase in the atomic radii.

Hence, the atomic radii decrease slightly and then start to increase of the transition metals when moving from left to right on the periodic table.

A substance has an empirical formula of CH2 and a molar mass of 56 grams per mole. The molecular formula for this compound is(1) CH2 (3) C4H8
(2) C4H6 (4) C8H4

Answers

(3) C4H8
C=12, H=1
CH2= 12+2=14
(CH2)n=56g/mol
14n=56
n=4
(CH2)4=C4H8

Answer:

3) C4H8

Explanation:

Castle learning

WILL MARK BRAINIESTIf the molecules of two different substances have a similar size but the molecules of one substance are polar while the molecules of the other substance are nonpolar, what is most likely true about the substances?
A The polar substance has a lower boiling point than the nonpolar substance.
BThe nonpolar substance has a lower boiling point than the polar substance.
C Both substances have similar volatilities.
DBoth substances have similar solubilities.

Answers

Answer:

  • The correct option is B. The nonpolar substance has a lower boiling point than the polar substance.

Explanation:

  • Substances with hydrogen bonding, an intermolecular force, will have much higher  boiling points than those that have ordinary dipole-dipole intramolecular forces. Non-polar molecules have lower boiling points, because they are held together by the weak van der Waals forces.

Note

  • However, if size of non polar increases, then its boiling point increases due to increases in van der walls forces with large size.
The correct answer is letter B: the non polar substance has a lower boiling point than the polar substance.
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