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4 years ago

I need help please my teaching is going to go crazy if I didn’t do it

Chemistry

1 answer:

victus00 [196]4 years ago

4 0

Answer:

No One is going to answer all this because it hard to type it all in her. its easy to search it up

Explanation:

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What accurately depicts the hemodynamic changes that occur in the body within the first 24 to 48 hours after a burn?

Fofino [41]

Answer: Hematocrit and WBC counts increases.

Explanation:

The hematocrit, also known as the "Hct", "crit" or PCV (packed cell volume) determines the percentage of red blood cells in the plasma. The term hematocrit means "to separate blood."

A patient with a severe burn loses huge amounts of plasma from damaged capillaries. As a result, the vascular space loses fluid in relation to cellular elements and the patient's hematocrit will be significantly increased.

8 0

4 years ago

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**A piece of marble (assume it is pure CaCO3) reacts with 2.00L of 2.52 M HCl. After dissolution of the marble, a 10.00 mL sampl

Mariulka [41]

Answer:

3.7 g

Explanation:

In this problem, marble reacted completely with an excess of HCl, which then reacted with NaOH

The reaction between marble and HCl is:

CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O

Then the excess HCl reacted with NaOH:

HCl + NaOH → NaCl + H₂O

So first let's calculate the amount of excess HCl that reacted with NaOH:

0.9987 M NaOH * 0.02487 L * $\frac{1molHCl}{1molNaOH}$ = 0.02483 mol HCl

Then we calculate the number of unreacted HCl moles in the original 2 L:

0.02483 mol HCl * 2 L / 0.01 L = 4.966 mol HCl

We substract that number from the initial HCl moles in order to find out how many of them reacted with the piece of marble

Initial HCl moles = 2.00 L * 2.52 M = 5.04 mol HCl

HCl moles that reacted with marble = 5.04 - 4.966 = 0.074 mol HCl

With that we can calculate the moles of marble, and finally the mass, using its molecular weight:

0.074 mol HCl * $\frac{1molCaCO_{3}}{2molHCl}$ * $\frac{100g}{1molCaCO_{3}}$ = 3.7 g marble

5 0

4 years ago

For which of the following reactions is ΔH∘rxn equal to ΔH∘f of the product(s)?

nexus9112 [7]

The correct answers are A, B, and D. The ΔHrxn is equal to the ΔHf when the ΔHf of the reactants is zero, and this can only occur when the reactants are pure elements (not compounds) in their natural phase at ambient temperature.

c) Chlorine's natural phase is gaseous, but since it is a liquid in this reaction, ΔHf ≠ 0.

e) CO is a compound, not a pure element.

f) BaCO3 is a compound, not a pure element.

6 0

3 years ago

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Balance the equations. Zn+ HCl → ZnCl2 +

motikmotik

Answer:

Zn + 2HCl → ZnCl2 + H2

Explanation:

Zn + HCl → ZnCl2 +

The complete equation is given below:

Zn+ HCl → ZnCl2 + H2

Now we can balance the equation by doing the following:

There are 2 atoms of Cl and 2 atoms of H on the left. This can be balanced by putting 2 in front of HCl as shown below:

Zn + 2HCl → ZnCl2 + H2

7 0

4 years ago

What rules should you follow when adding and subtracting? Check all that apply. 1. The exponents in scientific notation should b

Damm [24]

The answer to this question would be:
2. The exponents need to be the same so the leading numbers can be added or subtracted.
3. The result has the same number of decimal places as the least precise number.

The exponent is the 10^x that used in scientific notation. .When adding 12.3* 10^5 with 34.56 * 10^4, you need to make the exponent same first. In this case, it would become 12.3* 10^5 + 3.456 * 10^5= 15.756* 10^5
The decimal place could be rounded up to the least precise number. I'm not sure with the significant figures but it seems to use the biggest one.

3 0

4 years ago

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