F_CHEM_1411_E1

Which one of the following is often separated into its components by simple techniques such as filtering or decanting?

• heterogeneous mixture

• compounds

• homogeneous mixture

• elements

Homogeneous mixtures are also known as ________.

• compunds

• elements

• substances

• solutions

Which one of the following is not an intensive property?

• density

• temperature

• melting point

• mass

Which of the following are chemical processes?

1. rusting of a nail

2. freezing of water

3. decomposition of water into hydrogen and oxygen gases

4. compression of oxygen gas

• 2, 3, 4

• 1, 3, 4

• 1, 3

• 1, 2

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A wooden object has a mass of 10.782 g and occupies a volume of 13.72 mL. What is the density of the object determined to an appropriate number of significant figures?

• 8 × 10^-1 g/mL

• 7.9 × 10^-1 g/mL

• 7.86 × 10^-1 g/mL

• 7.859 × 10^-1 g/mL

A separation process that depends on differing abilities of substances to form gases is called ________.

• filtration

• solvation

• distillation

• chromatography

A cube of an unknown metal measures 0.250 cm on one side. The mass of the cube is 0.095 g. Which of the following is most likely the unknown metal?

• zirconium

• rhodium

• vanadium

• copper

Consider the following selected postulates of Dalton's atomic theory:

(i) Each element is composed of extremely small particles called atoms.

(ii) Atoms are indivisible.

(iii) Atoms of a given element are identical.

(iv) Atoms of different elements are different and have different properties.

Which of the postulates is(are) no longer considered valid?

• (i) and (ii)

• (ii) only

• (ii) and (iii)

• (iii) only

All atoms of a given element have the same ________.

• mass

• number of protons

• number of neutrons

• number of electrons and neutrons

There are ________ electrons, ________ protons, and ________ neutrons in an atom of ¹³²₅₄Xe.

• 132, 132, 54

• 54, 54, 132

• 78, 78, 54

• 54, 54, 78

Tags

NGSS.MS-PS1-1