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3 years ago

13

How closely a measurement reflects the actual value is precision. True or False??

1 answer:

Rina8888 [55]3 years ago

7 0

Answer:

very very very verytrue

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Calculate the number of moles of magnesium, chlorine, and oxygen atoms in 4.50 moles of magnesium perchlorate, mg(clo4)2. expres

Eva8 [605]

<span>4.50, 9.00, 36.00 First, count the number of atoms of each element in a single molecule of Mg(ClO4)2. Mg = 1 atom Cl = 1 * 2 = 2 atoms O = 4 * 2 = 8 atoms Now multiply the number of atoms of each element per molecule of the compound by the number of moles of the compound. So Mg = 1 * 4.50 = 4.50 Cl = 2 * 4.50 = 9.00 O = 8 * 4.50 = 36.00 So the answer is 4.50, 9.00, 36.00</span>

7 0

4 years ago

For the reaction 2 A + 4 B → 2 C + 4 D, what is the absolute magnitude of the rate of change for [B] when [C] is increasing at 4

Hoochie [10]

Answer:

$r_B=9.6M/s$

Explanation:

Hello there!

In this case, according to the given chemical reaction, it is possible for us to relate the rate of formation of C and the rate of consumption of B as shown below:

$\frac{r_B}{-4}=\frac{r_C}{2} \\\\$

Thus, we solve for the rate of change of B as shown below:

$r_B=\frac{-4r_C}{2}\\\\r_B=\frac{-4(4.8M/s)}{2} \\\\r_B=9.6M/s$

Best regards!

8 0

3 years ago

Which answer choice correctly describes what will happen to an element with four valence electrons if it engages in a chemical r

Andru [333]

The answer is D. It may gain or lose electrons.

6 0

3 years ago

Both compounds A and B have molecular formula C6H14. Monochlorination of compound A results in the formation of two constitution

Katarina [22]

Answer:

The name of the two compounds will be:

A :2,2-dimethylbutane

B: 3-methylpentane

Explanation:

The compounds are the isomers of hexane as per the given molecular formula.

There is no unsaturation or no ring is present in the compound.

Constitutional isomers are the one which have different arrangement of chain.

The possible compounds are shown in the figure with the products of monochlorination of the two isomers.

Thus there are five possible isomers of hexane.

3 0

3 years ago

A student titrated 20 ml of 0.410 m hcl with 0.320 m naoh. determine the volume of naoh needed at equivalence point

Aleksandr-060686 [28]

Answer:

25.6mL NaOH

Explanation:

We are given the Molarity of the solution ( $\frac{moles}{liters}$ ) and the volume of the solution (.02L).

By multiplying the two together, we can find the moles of solution that are reacted with HCl.

$moles = \frac{.410 moles}{L} *.02L$

This gives us .0082 moles of HCl.

We then find the moles of NaOH that are needed to react with the HCl using the equation.

$HCl + NaOH = NaCl + H_{2} O$

As HCl and NaCl have a 1:1 ratio, we need .0082 mol of NaOH.

Dividing this value by the Molarity of the solution

$\frac{.0082mol}{.320mol/L}$

Gives us the answer, in Liters (.0256), which we can then divide by 100 convert to mL.

3 0

3 years ago