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malfutka [58]
3 years ago
14

How would someone describe a passing grade

Chemistry
1 answer:
aliya0001 [1]3 years ago
8 0
A passing grade is a grade that makes a person eligible to go to the next grade.
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48. Explain how atoms (ions) are held together in an ionic bond. Give an example of an ionic
zalisa [80]

Answer:

By transfer of electron from electropositive to electronegative elements

Explanation:

Examples are NaCl, MgO, Al2O3

3 0
3 years ago
Read 2 more answers
(d) If you have 9.44 g of NazPO4, how many grams of AgNO, will be needed for complete
AlladinOne [14]

30.6 g of AgNO₃

Explanation:

We have the following chemical reaction:

Na₃PO₄ + 3 AgNO₃ → Ag₃PO₄ +  3 NaNO₃

Now we calculate the number of moles of  Na₃PO₄:

number of moles = mass / molecular weight

number of moles of Na₃PO₄ = 9.44 / 164 = 0.06 moles

Now we formulate the following reasoning:

if        1 mole of Na₃PO₄ will react with 3 moles of AgNO₃

then  0.06 moles of Na₃PO₄ will react with X moles of AgNO₃

X = (0.06 × 3) / 1 = 0.18 moles of AgNO₃

mass = number of moles × molecular weight

mass of AgNO₃ = 0.18 × 170 = 30.6 g

Learn more about:

mole concept

brainly.com/question/1445383

brainly.com/question/10165629

#learnwithBrainly

3 0
3 years ago
PLEASE HELP I WILL GIVE 50 POINTS
aleksandrvk [35]

Answer:

Some credit goes to user sness!

Explanation:

Download pdf
7 0
3 years ago
Mirex(MW = 540) is a fully chlorinated organic pesticide that was manufactured to control fire ants. Due to its structure, mirex
Delicious77 [7]

Answer:

The solution to the given problem is done below.

Explanation:

a)

i) =( 0.002 μg / L )( 1mg / 1000 μg )( 1L / kg )( 1000 mil / 1 billion) = 0.002 ppb

ii) =( 0.002 μg / L )( 1mg / 1000 μg )( 1L / kg )( 1,000,000 mil / 1 trillion) = 2 ppt

iii) =( 0.002 μg / L )( 1 mole / 540g ) = 3.7 x 10^{-6}μM.

b)

i) =( 0.002 μg / g ) = 0.002 ppm

ii) In solids, ppb = μg/kg

=( 0.002 μg / g )( 1000 mil/ 1 billion) = 2 ppb

7 0
3 years ago
Read 2 more answers
You need to prepare 250.0 mL of a 1.35 M HCl solution from a 4.50 M HCl stock solution. Glassware A is a 250 m L beaker. Glasswa
ch4aika [34]

Answer: Glassware C

Explanation:

According to moalrity equation:

M_1V_1=M_2V_2

M_1 = Molarity of stock solution = 4.50 M

V_1 = volume of stock solution = ?

M_2 = molaity of diluted solution = 1.35 M

V_2 = volume of diluted solution = 250.0 ml

4.50\times V_1=1.35\times 250.0

V_1=75.0ml

A volumetric flask is more accurate for making solutions than a beaker or erlenmeyer flask and hence to measure 75.0 ml of stock solution , we use 250 ml  of volumetric flask.

Thus 75.0 ml of stock is pipetted out using pipette and put into a volumetric flask of 250 ml and water is added till the mark reaches 250 ml.

A volumetric flask is more accurate for making solutions than a beaker or erlenmeyer flask and hence to measure 75.0 ml of stock solution , we use 250 ml  of volumetric flask.

3 0
3 years ago
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