Which of these substances are molecules?

1. H2O

2. NaCl

3. N2

4. O2

Question 12 options:

3 and 4

All of them

1 and 2

None of them

Which of these is a heterogeneous mixture? a. air b. soil c. steel d. salt water

Heterogeneous mixture containing a liquid in which visible particles settle

Einstein's Theory of Relativity was built on the research and ideas of other scientists. The Theory of Relativity proposes that the speed of light is a constant.

State the hypothesis of continental drift.

Which of these would not be a reason why earth can support life but other planets in our solar system do not have life?

Describe three characteristics that trees used to build treehouses should have. why are these characteristics essential

Select the correct value for the indicated bond angle in each of the following compounds: O-S-O angle of SO2 F-B-F angle of BF3 Cl-S-Cl angle of SCI2 O-C-O angle of CO2 F-P-F angle of PF3 H-C-H angle of CH4

What is the shape of a molecule with a triple bond?

4FeS2 + 11O2 > 2Fe2O3 + 8SO2 Given 75.0 grams of iron (IV) sulfide, how many grams of sulfur dioxide are produced?

Cytotoxic t cells can attack target cells with which chemical weapons?