A 4.0 g sample of iron was heated from 0°C to 20.°C. It absorbed 35.2 J of energy as heat. What is the specific heat of this piece of iron?

• 2816 J/gxC

• 2.27 J/gxC

• 2.27 J/g

• 0.44 J/gxC

Tags

NGSS.HS-PS3-4

Magnesium hydroxide decomposes to yield magnesium oxide and

• hydrogen

• oxygen

• water

• salt

Name the compound Fe(NO₃)₂.

• Iron (II) Nitrate

• Iron (II) Nitrite

• Iron (III) Nitrate

• Iron (III) nitride

These values were recorded as the mass of products when a chemical reaction was carried out three separate times: 8.83 g; 8.84 g; 8.82 g. The mass of products from that reaction is

8.60 g. The values are

• accurate, but not precise

• precise, but not accurate

• both accurate and precise

• neither

Tags

NGSS.HS-PS1-7

For the reaction represented by the equation 2H₂ + O₂ ® 2H₂O, how many grams of water are produced from 6.00 mol of hydrogen?

• 2

• 6

• 54

• 108

Tags

NGSS.HS-PS1-7

The electron configuration of an element is [Kr] 4d⁶ 5s¹. To what group does this element belong?

• 4

• 5

• 7

• 9

Tags

NGSS.HS-PS1-1

An electron for which n = 4 has more ____ than an electron for which n = 2.

• spin

• particle nature

• energy

• wave nature

The measurement 0.035550 g rounded off to two significant figures would be

• 0.03

• 0.35

• 0.036

• 3.5 x 10²

Which coefficients correctly balance the formula equation

NH₄NO₂(s)® N₂(g) + H₂O(l)?

• 1 2 2

• 1 1 2

• 2 1 1

• 2 2 2

Tags

NGSS.HS-PS1-7

What is the formula for the compound formed by calcium ions and chloride ions?

• CaCl

• Ca₂Cl

• CaCl₃

• CaCl₂

Tags

NGSS.HS-PS1-2