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3 years ago

Which of the following units is rarely, if ever, used in science labs?

Chemistry

1 answer:

nasty-shy [4]3 years ago

6 0

Answer: C. Quart

Explanation:

Quart is a unit of measurement for liquids and is equivalent to 2 pints.

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Write formulas for the ionic compounds formed by the following ions <br> magnesium and chloride

Xelga [282]

════════ ∘◦❁◦∘ ════════

<h3>Chemical reaction formula</h3>

#you can see the formula in pic for more detail writting

Mg2+ + Cl- -> MgCl2

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<h3>Chemical formula of product : MgCl2</h3>

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5 0

3 years ago

What is the molar concentration of Cu2+ in a solution that is labelled 5 ppm Cu2+? a)7.9x10^(-5)M b)7.9x10^(-6)M c)5.1x10^(-6)M

Savatey [412]

Answer:

1.24x10⁻⁴ mol/L

Something went wrong with the choices

Explanation:

5 ppm is a sort of concentration that indicates:

weigh of solute x 10⁶ / weigh of solution or volume of solution.

Relation must be in the order of 10⁻⁶, for example mg/kg / μg/g.

We can also write ppm as μg/mL, so 5 ppm will be understood as 5 μg of Ca²⁺ in 1mL of solution.

This would be the rule of three to reach molarity

In 1mL we have 5 μg of Ca²⁺

In 1000 mL we would have 5000 μg of Ca²⁺

Let's convert 5000 μg to g ( 1g = 1x10⁶μg)

5000 μg = 5x10⁻³ g

Now, that we have the mass, we convert it to moles (mass / molar mass)

5x10⁻³ g / 40.08g/m = 1.24x10⁻⁴ moles

As this moles are in 1000mL (1L) it's molarity

5 0

3 years ago

Human saliva has a pH of about 6.50. Which term BEST describes this solution?

zaharov [31]

6.5 is slightly acidic - so the answer is B.
This is due to 7 being neutral
7-14 is basic
0-7 is acidic

3 0

4 years ago

Why wasn't the water pasteurized

elixir [45]

Answer: who knows..

Explanation:

7 0

3 years ago

What is hybridization in chemistry? Give some example

dmitriy555 [2]

Answer:

Co2,so2

Explanation:

Hybridization is the mixing of atomic orbitals to form new hybrid orbitals.

Molecule shapes arise from how many hybrid orbitals the central atom uses and how they are arranged.

Don't read the all this but don't forget to leave a ❤

7 0

3 years ago