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Paladinen [302]

3 years ago

15

Strontium phosphate, Sr3(PO4)2, is a crystalline substance used in medicine and industry. How many phosphorus atoms are represen

ted in the formula for Sr3(PO4)2? a) 2b) 3c) 4d) 8

1 answer:

dexar [7]3 years ago

7 0

Answer: option A. 2

Explanation: in the formula Sr3(PO4)2, the 2 behind (PO4) is affecting both P and O4. It means that we have P2 in the formula

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Which statement describes a physical property of copper?

Dmitrij [34]

Answer is: It can be reshaped by a force.

Physical property can be observed and measured without any changes in molecular composition. The same substance is present before and after the change, changing the shape is physical change.

Copper reaction with acid, ignition and combination with oxygen are chemical change (chemical reaction), because new substances are formed, the atoms are rearranged and the reaction is followed by an energy change.

7 0

3 years ago

Read 2 more answers

An imaginary element with BCC structure and has an atomic radius of 0.17 nm, with a molar mass of 56.08 g/mol. What is the densi

Oksi-84 [34.3K]

<u>Answer:</u> The density of the given element is $3.07g/cm^3$

<u>Explanation:</u>

To calculate the edge length, we use the relation between the radius and edge length for BCC lattice:

$R=\frac{\sqrt{3}a}{4}$

where,

R = radius of the lattice = 0.17 nm

a = edge length = ?

Putting values in above equation, we get:

$0.17=\frac{\sqrt{3}\times a}{4}\\\\a=\frac{0.17\times 4}{\sqrt{3}}=0.393nm$

To calculate the density of metal, we use the equation:

$\rho=\frac{Z\times M}{N_{A}\times a^{3}}$

where,

$\rho$ = density

Z = number of atom in unit cell = 2 (BCC)

M = atomic mass of metal = 56.08 g/mol

$N_{A}$ = Avogadro's number = $6.022\times 10^{23}$

a = edge length of unit cell = $0.393nm=3.93\times 10^{-8}cm$ (Conversion factor: $1cm=10^{7}nm$ )

Putting values in above equation, we get:

$\rho=\frac{2\times 56.08}{6.022\times 10^{23}\times (3.93\times 10^{-8})^3}\\\\\rho=3.07g/cm^3$

Hence, the density of the given element is $3.07g/cm^3$

3 0

3 years ago

Which organ is NOT a part of the excretory system? *

Ierofanga [76]

Answer:

brain

Explanation:

5 0

3 years ago

Read 2 more answers

Make the following conversions. Show your calculations.

Natalija [7]

Answer:

1. 500 cm = 5 m

2. 1000 g = 1 kg

3. 455 L = 45, 500 cL

4. 0.865 m = 0.00865 m or 8.65 * 10^-3 n

5. 33.5 cm = 335 mm

6. 0.0198 m = 19800 micrometers

7. 57.65 cg = 5.765 * 10^8 nanograms

8. 1000 L = 1 kl

9. 99 degrees F = 37.222 degrees C

Explanation:

1. One meter = 100 centimeters

500 centimeters/ 100 centimeters = 5 meters

2. One kilogram = 1000 grams.

1000 grams/1000 grams = 1 kilogram

3. One Liter = 100 centiliters

455 liters * 100 centiliters = 45, 500 centiliters

4. One meter = 100 centimeters

0.865 centimeters/100 centimeters = 0.00865 meters

5. One centimeter = 10 millimeters

33.5 centimeters * 10 millimeters = 335 millimeters

6. One meter = 1.0 * 10^6 micrometers

0.0198 meters * 1 * 10^6 micrometers = 19800 micrometers.

7. One centigram = 1.0 * 10^7 nanograms

57.65 centigrams * 1 * 10^7 nanograms = 5.765 * 10^8 nanograms.

8. One kiloliter = 1000 L

1000 L/ 1000 L = 1 kiloliter

9. The formula for finding Celsius is 5/9(f - 32)

So 5/9(99 - 32) = x

5/9(67) = x

x = 335/9 or 37.222 degrees Celsius.

5 0

3 years ago

A lake in rural maine drops in ph from 7 to 5 as a result of acid rain falling into it. how has the h+ ion concentration change

Jlenok [28]

The H+ concentration in the lake has increased as a result of the acid rain.
The original pH of the lake was 7, which mean the water is neutral, but due to the acid rain, it drops to 5. This means, that the water has become acidic and how have more hydrogen ion. The H+ concentration in the lake has 100 times compares with its original pH.

3 0

3 years ago