Texas Chemistry

Which of the phase diagrams below best corresponds to the compound shown here?

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Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A 21.75 g sample of an unknown compound is found to contain 5.53 g of Na and 8.53 g of Cl. Which of these compounds is it most likely to be?

• NaCL

• NaClO

• NaClO₂

• NaClO₃

• NaClO₄

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

A student adds 10 mL of 1.0 M NaCl to 50 mL of 0.10 M Pb(NO3)2 and a white precipitate forms. The student dries and weighs the product and records a mass of 1.53 g. What is the most likely source of the error?

• The student transposed two digits when writing down the mass.

• Some product was lost during handling.

• The product is not fully dry.

• The reaction did not go to completion.

• The bottle labeled NaCl was actually a different reagent with a higher molar mass, such as NaBr.

Tags

NGSS.HS-PS1-7

How many sp 3 hybridized carbon atoms are in the ibuprofen molecule shown in question C18?

• 0

• 4

• 6

• 7

• 13

Tags

NGSS.MS-PS1-1

If 78.8 g of AgI is added to 630.0 mL of 0.45 M FeI3 and the solution is diluted to 1.00 L, what will the iodide concentration in the final solution be? (AgI Ksp = 8.52 × 10^-17).

• 0.19 M

• 0.28 M

• 0.36 M

• 0.85 M

• 1.0 M

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

What does a represent?

• Proton

• Neutron

• Electron

Tags

NGSS.MS-PS1-1

What is the symbol of this element?

• Calcium

• P

• Ca

• C

Which particle contributes the negative charge to the atom?

• proton

• electron

• neutron

• nucleus

Gold is an example of a(n) 

• pure element

• pure compound

• pure mixture

What is the number of protons that the element in this image contain?

• 14

• 7

• 15

• 18

Tags

NGSS.MS-PS1-1