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Ca(OH)₂ + Al₂(SO₄)₃ → CaSO₄ + Al(OH)₃

When the above equation is balanced, the coefficients in order are -

• 3, 1, 3, 2

• 2, 1, 1, 2

• 1, 1, 1, 1

• 3, 2, 2, 1

A 1.0 M aqueous solution of which substance would have the lowest pH?

• 
  Ba(OH)₂

• HCl

• NaF

• 
  NH₃

How many electrons does the iron ion have when it forms the ionic compound FeCl₃?

• 26

• 20

• 29

• 23

Bonding between two elements of equal electronegativity would be -

• ionic

• metallic

• 50% ionic

• 100% covalent

What is the correct name for the compound P₄O₆?

• phosphoric acid

• phosphorous (IV) oxide

• phosphorous oxide

• tetraphosphorous hexoxide

Using the chart above, which of these combinations will probably form a precipitate?

• copper (II) carbonate

• barium bromide

• calcium chromate

• ammonium chloride

The melting point of a white solid substance was determined in four repeated trials to be 56.0°C, 55.0°C, 57.5°C, 55.5°C. What temperature should be reported as the melting point as a result of these trials?

• 55

• 57.5

• 55.5

• 56

Tags

NGSS.MS-PS1-4

The net charge on an aluminum ion is +3 because there are -

• 10 neutrons and 13 electrons in the atom

• 13 protons and 10 neutrons in the nucleus

• 10 protons and 13 electrons in the atom

• 13 protons and 10 electrons int he atom

The mass of an object was recorded as 9.93 g, 9.90 g, and 10.02 g, using an electronic analytic balance. What is the average of these three masses expressed to the correct number of significant figures?

• 9.95

• 9.9

• 10.0

• 10.00

C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(g)

If 5.0 moles of C₃H₈ react, how many molecules of water are formed?

• 1.2 × 10²⁵

• 3.0 x 10²⁴

• 2.4 x 10²⁴

• 4.8 x10²⁴

Tags

NGSS.HS-PS1-7