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3 years ago

32. Calculate the pH of a solution at 1.00 x 10- MIH") and identify the substance as an acid or base,

Chemistry

1 answer:

Gre4nikov [31]3 years ago

8 0

Answer:

${ \boxed{ \tt{formular : pH = - log[H {}^{ + } ]}}} \\ pH = - log(1.00 \times {10}^{-6} ) = 6: it's an acid\\ since \: we \: lack \: the \: exponent, \: this \: question \: is \: unsolvable \\ { \green{ \bf{take \: note}}} :{ \tt{pH \: below \: 7 \: that \: is \: { \red{acidic}}. \: \: pH \: greater \: than \: 7 \: is \: { \red {basic}}}}$

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Plz help give me all the answers to these

Gnoma [55]

16)position
17)starting point
19)balanced, are different, balanced, unbalanced

4 0

3 years ago

After 42 days, a 2.0 g sample of phosphorous-32 contains only 0.25 g of the isotope. What is the half-life of phosphorus-32?

tester [92]

Answer:

Half life of phosphorous-32 = 14 days

Explanation:

Given data:

Total mass of phosphorous-32 = 2.0 g

After 42 days mass left = 0.25 g

Half life of phosphorous-32 = ?

Solution:

First of all we will calculate the number of half lives passed.

At time zero = 2.0 g

At first half life = 2.0 g/2 = 1.0 g

At 2nd half life = 1.0 g/2 = 0.5 g

At 3rd half life = 0.5 g/2 = 0.25 g

Half life:

Half life = T elapsed / half lives

Half life = 42 days/ 3

Half life = 14 days

4 0

2 years ago

Rank these elements from smallest to largest atomic radii: zinc, calcium, radium, and bromine.

Anit [1.1K]

Answer:

The correct option is;

c. Bromine, zinc, calcium, radium

Explanation:

The atomic radii of the elements as arranged in the periodic table decreases across the period and increases down the groups

The location of each of the elements are;

Zinc: Period 4, Group 12

Calcium: Period 4, Group 2

Radium: Period 7, Group 2

Bromine: Period 4, Group 17

Therefore, the element with the largest atomic radius = Radium

The element with the smallest atomic radius = Bromine

Calcium comes before zinc on period 4, therefore, the atomic radius of calcium is larger than that of zinc

The rank of the elements from smallest to largest atomic radius is therefore;

Bromine, zinc, calcium, radium.

7 0

3 years ago

What is the empirical formula for a compound if a sample contains 1.0 g of S and 1.5g of O

Digiron [165]

M(S)=1 g
m(O)=1.5 g
M(S)=32 g/mol
M(O)=16 g/mol

n(S)=m(S)/M(S)
n(O)=m(O)/M(O)

n(S)=1/32=0.03125 mol
n(O)=1.5/16=0.09375 mol

S : O = 0.03125 : 0.09375 = 1 : 3

SO₃ - is the empirical formula

7 0

3 years ago

A coffee cup calorimeter contains 100.0 g of water at 10.0 ◦C. A 72.4 g sample of iron is heated to 100 ◦C and dropped into the

bonufazy [111]

Answer:

The final temperature is 16.47°C.

Explanation:

Water

m₁= 100 g

T₁= 10 °C

Cp₁= 4.184 J/g°C

Iron

m₂= 72.4 g

T₂=100 °C

Cp₂= 0.449 J/g°C

The temperature of iron i higher than the water that is why iron will loose and water will gain the heat.

We know that

Q= m Cp ΔT

Lets take final temperature is T

m₁ Cp₁ ( T- T₁ ) = m₂ Cp₂ ( T₂ -T)

100 x 4.184 ( T- 10) = 72.4 x 0.449 ( 100 - T)

12.87 ( T- 10) = 100 - T

12.87 T - 128.7 = 100 - T

13.87 T = 128.7 + 100

T=16.47°C

The final temperature is 16.47°C.

5 0

3 years ago

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