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polet [3.4K]
3 years ago
10

I NEED HELLLLLLLLLP I will give crown

Chemistry
1 answer:
mrs_skeptik [129]3 years ago
3 0

Answer:

Metal 3

Explanation:

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Human blood has a pH between 7.35 and 7.45. Which of the following best describes human blood?
uysha [10]

Answer:

C. slightly basic

Explanation:

0-7 = acidic

7 = neutral

7-14 = basic

- Since the pH is just over 7, the answer would be slightly basic.

- Hope this helps! Please let me know if you need a further explanation.

6 0
3 years ago
4g of calcium metal is burned in oxygen of air to form calcium oxide. (Ca = 40, O= 16, at STP: 32g of oxygen has 22.4L)
Alexus [3.1K]

Answer:

m=4 g Ca

M=ArCa+ArO=56 g/mol

Ca+O2-2CaO

nCa= m/M= 4/40=0.1 moles of Ca

the ratio of moles: 1 mole Ca:2 moles CaO

0.1 moles Ca =0.2 moles CaO

n=m/M

m=n×M

m=0.2×56=11.2 g CaO

3 0
2 years ago
If 50 ml of 0.235 M NaCl solution is diluted to 200.0 ml what is the concentration of the diluted solution
Helen [10]

This is a straightforward dilution calculation that can be done using the equation

M_1V_1=M_2V_2

where <em>M</em>₁ and <em>M</em>₂ are the initial and final (or undiluted and diluted) molar concentrations of the solution, respectively, and <em>V</em>₁ and <em>V</em>₂ are the initial and final (or undiluted and diluted) volumes of the solution, respectively.

Here, we have the initial concentration (<em>M</em>₁) and the initial (<em>V</em>₁) and final (<em>V</em>₂) volumes, and we want to find the final concentration (<em>M</em>₂), or the concentration of the solution after dilution. So, we can rearrange our equation to solve for <em>M</em>₂:

M_2=\frac{M_1V_1}{V_2}.

Substituting in our values, we get

\[M_2=\frac{\left ( 50 \text{ mL} \right )\left ( 0.235 \text{ M} \right )}{\left ( 200.0 \text{ mL} \right )}= 0.05875 \text{ M}\].

So the concentration of the diluted solution is 0.05875 M. You can round that value if necessary according to the appropriate number of sig figs. Note that we don't have to convert our volumes from mL to L since their conversion factors would cancel out anyway; what's important is the ratio of the volumes, which would be the same whether they're presented in milliliters or liters.

5 0
3 years ago
Need help with this question
Veseljchak [2.6K]

Answer: last one

Explanation:

5 0
3 years ago
If I have 5.00g of solid CO₂ that is allowed to sublimate (turn to gas) in an empty balloon. How many moles of CO₂ are present i
r-ruslan [8.4K]

56g is the coreect acsnw

8 0
2 years ago
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