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3 years ago

Hot glassware has a red glow to it O True O False

Chemistry

2 answers:

Komok [63]3 years ago

4 0

Answer:

false it has a green glow to it

xeze [42]3 years ago

3 0

Answer:

false

I think so

have a nice day

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How many atoms are in 45.6 grams of sulfur

Inessa [10]

Explanation:

6.022x10^23 is correct answer

8 0

3 years ago

The Ksp of barium fluoride, BaF2, is 1.6 x 10-6. A solution of 5.0M NaF is added dropwise to a 2.0L solution that is 0.016 M in

Hatshy [7]

Answer:

Precipitation will occur after the concentration of fluoride ions exceeds 0.01 M.

4 mL volume of NaF must be added to cause $BaF_2$ to precipitate.

Explanation:

Concentration of barium ions = $[Ba^{2+}]=0.016 M$

Volume of barium ion solution = 2.0 L

$BaF_2\rightleftharpoons Ba^{2+}+2F^-$

The solubility product of the barium fluoride = $K_{sp}=1.6\times 10^{-6}$

$K_{sp}=[Ba^{2+}][F^-]^2$

$1.6\times 10^{-6}=[0.016 M]\times [F^-]^2$

$[F^-]=0.01 M$

Precipitation will occur after the concentration of fluoride ions exceeds 0.01 M.

Concentration of fluoride ion = $C_1=0.01 M$

Volume of solution = $V_1=2.0 L$

Concentration of NaF solution added = $C_2=5.0 M$

Volume of NaF solution added = $V_2=?$

$C_1V_1=C_2V_2$

$V_2=\frac{0.01 M\times 2.0 L}{5.0 M}=0.004L$

1 L = 1000 mL

0.004 L = 0.004 × 1000 mL = 4 mL

4 mL volume of NaF must be added to cause $BaF_2$ to precipitate.

3 0

3 years ago

The rate of disappearance of hbr in the gas phase reaction 2hbr(g)→h2(g)+br2(g) is 0.140 m s-1 at 150°c. the rate of appearance

VMariaS [17]

<span>Answer: 0.070 m/s

Explanation:

1) balanced chemical equation:

given: 2HBr(g) → H2 (g)+Br2(g)

2) Mole ratios:

2 mol HBr : 1 mol H2

3) That means that every time 2 moles of HBr disappear 1 mol of H2 appears.

That is, the H2 appears at half rate than the HBr disappears.

∴ rate of appearance of H2 = rate of disappearance of HBr / 2 = 0.140 m/s / 2 = 0.070 m/s, which is the answer.</span>

4 0

3 years ago

Perform the following mathematical operation, and report the answer to the appropriate number of significant figures.

nordsb [41]

Answer:

12.306

Explanation:

12.3+0.005675=12.305675 just put answer as 12.306

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2 years ago

Why do we put these three words together in the 'fire triangle'?

bazaltina [42]

The three word of this is to represent what it takes to create and maintain a fire

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3 years ago