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3 years ago

13

Calculate the amount of energy required (in joules) to heat 12 g of water from 22.5 degree Celsius to 43.0 degree Celsius. The s

pecific heat of water is 4.18 j/g degree Celsius. (Look at the image above for a clear understanding)
Use the formula q=mcdeltaT

1 answer:

Nitella [24]3 years ago

7 0

Answer:

12 g 22.5 balls in butt

Explanation:

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In an electrical neutral Atom,..

Leno4ka [110]

Answer :

Option B) The number of protons equals the number of electrons

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3 years ago

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Help please :)<br> Describe two characteristics that protists have that make them eukaryotes.

V125BC [204]

Answer:

Animal? Bacteria? Plant? Fungi? What do these figures represent?

2

None of the above! These organisms may be single-celled like bacteria, and they may look like a fungus. They also may hunt for food like an animal or photosynthesize like a plant. And, yet, they do not fit into any of these groups. These organisms are protists!

What are Protists?

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Protists are eukaryotes, which means their cells have a nucleus and other membrane-bound organelles. Most protists are single-celled. Other than these features, they have very little in common. You can think about protists as all eukaryotic organisms that are neither animals, nor plants, nor fungi.

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Although Ernst Haeckel set up the Kingdom Protista in 1866, this kingdom was not accepted by the scientific world until the 1960s. These unique organisms can be so different from each other that sometimes Protista is called the “junk drawer" kingdom. Just like a junk drawer, which contains items that don't fit into any other category, this kingdom contains the eukaryotes that cannot be put into any other kingdom. Therefore, protists can seem very different from one another.

Explanation:

Hope it helps, some how.

7 0

3 years ago

iVinArrow [24]

Answer:

pH=2.16

Explanation:

Hello,

In this case, the first step is to compute the molarity of the 0.10%-w/v valproic acid solution by assuming 100 mL of solution:

$M=\frac{0.10g}{100mL}*\frac{1mol}{144.21g} *\frac{1000mL}{1L}\\ \\M=6.934x10^{-3}M$

Moreover, the equilibrium expression for the valproic acid (a weak one) is written as follows:

$Ka=\frac{[H^+][A^-]}{[HA]}$

Whereas HA represents the valproic acid and A⁻ its conjugate base. Thus, by computing Ka via its pKa and writing the aforementioned equilibrium expression in terms of $x$ we obtain:

$10^{-4.8}=1.585x10^{-5}=\frac{x*x}{6.934x10^{-3}-x}$

Thus, solving for $x$ , which also equals the concentration hydrogen ions, we obtain:

$x=[H^+]=6.93399x10^{-3}M$

Therefore, the pH is:

$pH=-log([H^+])=-log(6.93399x10^{-3})\\\\pH=2.16$

Best regards.

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3 years ago

How many moles in 1.00g of salicylic acid?

salantis [7]

Answer:- 0.00724 moles.

Solution:- Grams of salicylic acid are given and it asks to calculate the moles.

For the moles, we divide the grams by the molar mass.

Formula of salicylic acid is $C_7H_6O_3$

Molar mass = 7(12.01)+6(1.01)+3(16.00)

= 84.07+6.06+48.00

= 138.13 gram per mol

We could make the dimensional analysis set up for showing unit cancellation and have the moles.

$1.00g(\frac{1mol}{138.13g})$

= 0.00724 moles

So, there will be 0.00724 moles of salicylic acid in it's 1.00 gram.

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4 years ago

What is the scientific notation of (41 e 23) (8.0 e 3)

sp2606 [1]

Answer:b

Explanation:

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3 years ago