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Fofino [41]
3 years ago
7

Match the scientists to their contributions to the development of the periodic table.

Chemistry
1 answer:
stiv31 [10]3 years ago
3 0
Where’s the chart and scientists?
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How many moles are needed
geniusboy [140]

Answer: amount of substance n = cV = 2.0 mol/l x 0.25 l = 0.50 mol

Explanation:

7 0
2 years ago
How many grams of phosphorus are in 500.0 grams of calcium phosphide? (i need the work also)
kvv77 [185]

Answer:

\boxed{\text{170.0 g P}} 

Explanation:

The formula of calcium nitride is Ca₃P₂.

The masses of each element are:

\begin{array}{lrcr}\text{3Ca:} & 3 \times 40.08&=& \text{120.24 u}\\\text{2P:} & 2\times 30.97&=& \text{61.94 u}\\& \text{TOTAL} & = & \text{182.18 u}\\\end{array}

So, there are 61.94 g of P in 182.18 g of Ca₃P₂.

In 500 g of Ca₃P₂:

\text{Mass of P} = \text{500.0 g Ca$_{3}$P$_{2}$} \times \dfrac{\text{61.94 g P}}{\text{182.18 g Ca$_{3}$P$_{2}$}} = \text{170.0 g P}

There are \boxed{\textbf{170.0 g P}} in 500.0 g of Ca₃P₂.

3 0
3 years ago
A 12.0 g sample of a metal is heated to 90.0 ◦C. It is then dropped into 25.0 g of water. The temperature of the water rises fro
deff fn [24]

Answer:

The specific heat of the metal is 0.34 J/g°C

Explanation:

Step 1: Data given

Mass of the metal = 12.0 grams

Mass of the water = 25.0 grams

Initial temperature of the metal = 90.0 °C

Initial temperature of the water = 22.5 °C

Final temperature = 25 °C

Specific heat of water = 4.184 J/g°C

Step 2: Calculate the specific heat of the metal

Qlost = Qgained

Q = m*c*ΔT

Qmetal = -Qwater

m(metal) *c(metal)* ΔT(metal) = -m(water) * c(water) *ΔT(water)

⇒ with mass of metal = 12.0 grams

⇒ with c(metal) = TO BE DETERMINED

⇒ with ΔT(metal) = T2 - T1  = 25.0°C - 90.0 °C = -65.0 °C

⇒ with mass of water = 25.0 grams

⇒ with c(water) = 4.184 J/g°C

⇒ with ΔT(water) = T2 - T1 = 25.0 - 22.5 °C = 2.5 °C

12.0 * c(metal) * -65.0 °C = -25.0g * 4.184 J/g°C * 2.5°C

-780.0 * c(metal) = -2615  ( 2.6*10^3 with sig figs)

c(metal) = 0.335 (=0.34 with sig figs)

The specific heat of the metal is 0.34 J/g°C

3 0
2 years ago
A scientist observes rock masses that have moved past each other in opposite horizontal directions. Which feature does the scien
Advocard [28]

Answer: strike-slip fault

Explanation:

5 0
2 years ago
Read 2 more answers
A solution of 2.9 m weak acid is 0.52 ionized. what is the ka value of this acid
AveGali [126]
We can get the Ka value from this formula:

Ka = [H+] [A-} / [HA] 

So we need to know [H+] & [A-] & [Ha] to get the Ka value

[H+] = 2.9 * 0.52/100 =0.01508 M

and when [H+] = [A-]
∴[A-] = 0.01508 M

∴ [HA] = 2.9 - 0.01508 = 2.88 M
So by substitution:

Ka = [0.01508][0.01508] / 2.88
     = 7.9 x 10^-5 
6 0
3 years ago
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