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2 years ago

PLS HELP MEE !! Andy classified some substances as shown in the table.

Chemistry

2 answers:

Lelechka [254]2 years ago

5 0

Number 1 Bc of wood a magnetic

NISA [10]2 years ago

5 0

Answer:

The answer is leather is a non magnetic substance.

Explanation:

its kinda obvious lol

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if the charcoal from an ancient fire contains 1/512 amount of carbon-14 as a living tree, how long ago did the fire occur? the h

Anit [1.1K]

Answer:

11.19 half lives

Explanation:

4 0

2 years ago

A 600.0 mL sample of 0.20 MHF is titrated with 0.10 MNaOH. Determine the pH of the solution after the addition of 600.0 mL of Na

Leona [35]

Answer: pH=12.69

Explanation:

${\text{Moles of HF}=Molarity\times {\text{Volume of solution in liters}}$

${\text{Moles of HF}=0.20M\times 0.6L=0.12 moles$

$HF\rightarrow H^++F^-$

Initial 0.12 0 0

Eqm 0.12-x x x

$K_a=\frac{[H^+][F^-]}{[HF]}$

$3.5\times 10^{-4}=\frac{x^2}{0.12-x}$

(neglecting small value of x in comparison to 0.12)

$x=4.2\times 10^{-5}$

Moles of $H^+=4.2\times 10^{-5}$

$NaOH\rightarrow Na^++OH^-$

${\text{Molesof NaOH}}=Molarity\times {\text{Volume of solution in liters}}$

${\text{Moles of NaOH}}=0.10M\times 0.6L=0.06 moles$

0.06 moles of NaOH will give 0.06 moles of $[OH^-]$

Now $4.2\times 10^{-5}$ moles of $OH^-$ will be neutralized by $4.2\times 10^{-5}$ moles of $H^+$ and $(0.06-4.2\times 10^{-5})=0.059$ moles of $OH^-$ will be left.

Molarity of $OH^-=\frac{0.059moles}{1.2L}=0.049M$

$pOH=-\log[OH^-]=-\log[0.049]=1.31$

pH = 14 - pOH= 14 - 1.31 = 12.69

5 0

2 years ago

How many chloride ions are in 0.486 moles of chloride ions?

svetlana [45]

Answer:

Since in a chloride ion, we have an additional electron

you might think that it will affect the mass but the mass of an electron is almost negligible so we will ignore that

Amount of ions in 1 mol = 6.022 * 10^23

Amount of ions in 0.486 moles = 0.486 * (6.022*10^23)

Amunt of ions in 0.486 moles = 2.9 * 10^23 ions

Hence, option 1 is correct

6 0

2 years ago

The volume of a single strontium atom is 4.15×10-23 cm3. What is the volume of a strontium atom in microliters

Ivenika [448]

Answer:- $4.15*10^-^2^0\mu L$

Solution:- It is a volume unit conversion problem where we are asked to convert the volume from $cm^3$ to microliters.

We know that:

$1cm^3$ = 1 mL

$1mL=10^-^3L$

and, $1L=10^6\mu L$

Let's use these conversions factors for the desired conversion using dimensional as:

$4.15*10^-^2^3cm^3(\frac{1mL}{1cm^3})(\frac{10^-^3L}{1mL})(\frac{10^6\mu L}{1L})$

= $4.15*10^-^2^0\mu L$

So, the answer is $4.15*10^-^2^0\mu L$ .

7 0

2 years ago

Which part of experimental design is most important to a scientist when replicating an experiment? Having exactly the same data

yarga [219]

Answer:

The answer to your question is below:

Explanation:

Having exactly the same data as the previous experiment I think that having the same data as the previous experiment is extremely important but not the most important, for me is the second most important.

Using the same procedure and variables as the previous experiment For me, this is the most importan thing when a scientist is designing an experiment, because if he or she follow exactly the same procedure and variables, then the results will be very close.

Conducting an experiment similar to the previous experiment This characteristic is important but not the most important.

Using the same laboratory that was used in the previous experiment It is not important the laboratory, if the procedure and variables are the same, your experiment must give the same results in whatever laboratory.

5 0

2 years ago

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