2 years ago

Pleaseeee help pretty please

Chemistry

2 answers:

lesantik [10]2 years ago

4 0

Answer:

A object made from iron .

Explanation:

KATRIN_1 [288]2 years ago

4 0

I believe the answer is any object made up of iron since iron has a strong reaction to magnets so it must have a strong connection with the magnetic field

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Calculate the percent by mass of a solution of Ca(NO3)2 that has 22.63 g dissolved in 896.92 g of water.

never [62]

Hey there!

To calculate the percent by mass of the Ca(NO₃)₂ we need to find the total mass first by adding.

896.92 + 22.63 = 919.55

In total, the solution is 919.55 grams.

To find the percent of Ca(NO₃)₂ in the solution, divide the mass of Ca(NO₃)₂ by the total mass and multiply by 100.

22.63 ÷ 919.55 = 0.0246

0.0246 x 100 = 2.46

Ca(NO₃)₂ makes up 2.46% of the solution.

Hope this helps!

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2 years ago

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vaieri [72.5K]

Answer:

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Explanation:

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2 years ago

Where are electrons found in the atom?

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2 years ago

) PABA refers to para-aminobenzoic acid which is used in some sunscreen formulations. If a 0.055 M solution of PABA has a pH of

AleksandrR [38]

Answer: $K_a$ of PABA is 0.000022

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$NH_2C_6H_5COOH\rightarrow H^++NH_2C_6H_5COO^-$

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So dissociation constant will be:

$K_a=\frac{(c\alpha)^{2}}{c-c\alpha}$

Give c= 0.055 M and $\alpha$ = ?

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$1.09\times 10^{-3}=0.055\times \alpha$

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Putting in the values we get:

$K_a=\frac{(0.055\times 0.02)^2}{(0.055-0.055\times 0.02)}$

$K_a=0.000022$

Thus $K_a$ of PABA is 0.000022

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2 years ago

In volcanic rock does the proportions of iron oxide increase when silicon dioxide increases?

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THe amount of iron oxide decreases as the level of silica increases.

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