A compound contains 1.00 mol of Sb. 1.50 mol C and 4.50 mol of O What is the empirical formula?

• SbCO

• Sb₂C₃O₉

• SbC_1.5O_4.5

• SbC₃O₉

Tags

NGSS.HS-PS1-7

Based on this mass spectrum, how many isotopes does Mercury have?

• 1

• 3

• 5

• 7

Tags

NGSS.HS-PS1-8

Determine the number of significant figures in 0.0019670

What is the molar mass for Na₂O to 4 sig. figs. Do not include units.

What is the molar mass of HgHCO₃

• 229.61 g/mol

• 287.65 g/mol

• 378.40 g/mol

• 261.6 g/mole

Which arrow points to a neutron?

• Arrow A

• Arrow B

• Arrow C

• Arrow D

Tags

NGSS.HS-PS1-8

Which shows the proper set up to calculate how many oxygen atoms are present in 20g of Ca(NO₃)₂

• (20/164)×(6/1)×(6.02×10²³)

• (20/164)×(1/6)×(6.02×10²³)

• (164/20)×(6/1)×(6.02×10²³)

• (20/164)×(6/1)

Tags

NGSS.HS-PS1-7

How many valence electrons are in this atom? Enter just a number (The element in the picture has 13 p⁺, 14 n⁰, 14e^- in 2:8:3 order on 3 rings)

Tags

NGSS.HS-PS1-1

Select all of the true statements

(The element in the picture has 13 p⁺, 14 n⁰, 14e^- in 2:8:3 order on 3 rings)

• This element has 13 electrons in total

• This element forms a +13 ion

• This element has a mass of 27

• This element is in the 3rd period

• This element is in Group 15

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following nickle compounds contains the highest percentage nickle by mass?

• NiCl₂

• NiO₂

• NiO

• Ni₃(PO₄)₂