39. Chromium and chlorine form an ionic compound whose formula is CrCl3. The name of thiscompound is
a. chromium (III) chloride
c. monochromium trichloride
b. chromium chlorine
d. chromium(III)trichloride

Answers

Answer 1

Answer:

Answer:

a. chromium (III) chloride

Explanation:

Chromium chloride is also binary ionic compound composed of only two element chromium and chlorine.

When naming these compounds the name of metal or cation is written first and anion is written after the cation. The anions are non meals.

The anion name is end with suffix " ide".

such as chromium chloride.

The (III) shows the oxidation number of metal. In given compound the oxidation state of chromium is +3 while chlorine chow the oxidation state of -1 that's why three chlorine atoms are attached with one chromium atom.

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Ten interesting facts about radium and polonium

Answers

1. They were both discovered by Marie and Pierre Curie.
2. They can both poison you.
3. Radium is named after the Latin word for "Ray"
4. Polonium is named after Poland, the country in which Marie Curie was born.
5. Marie and Pierre Curie obtained radium and polonium from pitchblende, a material containing uranium.
6. Polonium was discovered in 1898.
7. Radium was discovered in 1898 as well.
8. Radium and polonium are both elements on the periodic table.
9. Polonium is also called "radium F".
10. Both radium and polonium must be handled very carefully with good equipment, or their toxic fumes could spread and possibly be fatal.

Hope this helped! :)

PLEASE HELP ME WITH MY HOMEWORK!!!!!2. A metal bar is 100cm long. It is heated for an hour. What could be the new length of the bar? a)102cm b)99cm c)98cm d)99.2cm
3. Why are there gaps in concrete roads?
a)to allow for contraction
b)cheaper
c)to allow for expansion
d)it makes it easier to repair one section of the road

Answers

2 b

3 d

you are welcome for that

How does a seal belt help prevent injuries by applying a for

Answers

A seat* belt can help prevent major injuries from car crashes because it can buckle people down safely. If a car crashed into the car and you were in the front seat without a seat belt, you could catapult straight out the window. With a seatbelt on, you will be restrained and fastened to the chair and have some not major injuries.

A seat belt helps to prevent injury in the event of a car crash by reducing the velocity of a body as it experiences a sudden decrease in speed. Due to the body's inertia, which is its 'resistance to a change in speed or direction of travel', a passenger in a vehicle will want to continue travelling forwards once the car has reached a sudden stop. If the vehicle is travelling at 50mph and crashes into a brick wall, instantly reducing its velocity to zero, the passenger will continue moving forwards at 50mph unless there is something in front of them to create a 'stopping force'. This is because the velocities of the car and passenger are independent.. Hope this helps you!(: Good luck.

Please help! I don’t know how to calculate reacting masses

Answers

Answer:

Mass of phosphoric acid = 6.37 g

Mass of magnesium nitride = 50.5 g

Mass of iron chloride = 22.71 g

Explanation:

1 = Given data:

Mass of phosphorus = 4 g

Mass of phosphoric oxide = ?

Solution:

4P + 5O₂ → 2P₂O₅

Number of moles of phosphorus = mass / molar mass

Number of moles of phosphorus = 4 g / 31 g/mol

Number of moles of phosphorus = 0.13 mol

Mole ration of phosphorus and phosphoric acid.

P : P₂O₅

4 : 2

0.13 : 2/4× 0.13 = 0.065 mol

Mass of phosphoric acid:

Mass of phosphoric acid = moles × molar mass

Mass of phosphoric acid = 0.065 mol × 98 g/mol

Mass of phosphoric acid = 6.37 g

2 = Given data:

Mass of magnesium = 36 g

Mass of magnesium nitride = ?

Solution:

3Mg + N₂ → Mg₃N₂

Number of moles of magnesium = mass / molar mass

Number of moles of magnesium = 36 g / 24 g/mol

Number of moles of magnesium = 1.5 mol

Mole ration of magnesium and magnesium nitride.

Mg : Mg₃N₂

3 : 1

1.5 : 1/3× 1.5 = 0.5 mol

Mass of magnesium nitride:

Mass of magnesium nitride = moles × molar mass

Mass of magnesium nitride = 0.5 mol × 101 g/mol

Mass of magnesium nitride = 50.5 g

3 = Given data:

Mass of iron = 8 g

Mass of iron chloride = ?

Solution:

2Fe + 3Cl₂ → 2FeCl₃

Number of moles of iron = mass / molar mass

Number of moles of iron = 8 g / 55.85 g/mol

Number of moles of iron = 0.14 mol

Mole ration of iron and iron chloride.

Fe : FeCl₃

2 : 2

0.14 : 0.14

Mass of iron chloride:

Mass of iron chloride = moles × molar mass

Mass of iron chloride = 0.14 mol × 162.2 g/mol

Mass of iron chloride = 22.71 g

When mixed, which states of matter form only a homogeneous mixture?A.two liquids
B.two gases
C.a solid and a liquid
D.a liquid and a gas

Answers

The correct answer is b. two gases

The explanation:

-Mixtures can be either homogeneous or heterogeneous. A homogeneous mixture is a type of mixture in which the composition is uniform and every part of the solution has the same properties.\

- Examples of homogeneous mixtures include alloys and alcohol in water. A heterogeneous mixture is a type of mixture in which the components can be seen.

-One example of a mixture is air. Air is a homogeneous mixture of the gaseous substances nitrogen, oxygen, and smaller amounts of other substances.

Answer: B.two gases

Explanation: Homogeneous mixtures are mixtures in which dispersed phase is uniformly distributed throughout the dispersion medium and there is no physical boundary between the dispersed phase and dispersion medium.

Heterogeneous mixtures are mixtures in which dispersed phase is not uniformly distributed throughout the dispersion medium and there is a distinct physical boundary between the dispersed phase and dispersion medium.

a) Two liquids may or may not be completely miscible thus may form a homogeneous (milk and water) or a heterogeneous mixture (oil and water).

b) Two gases always form a homogeneous mixture as there is large vacant spaces present between the molecules.

c) A solid and a liquid may or may not be completely miscible thus may form a homogeneous (salt and water) or a heterogeneous mixture ( sand and water).

d) A liquid and a gas may or may not be completely miscible thus may form a homogeneous (river water) or a heterogeneous mixture (perfume spray).

Select the choice that best completes the following sentence.When an object orbits another object, it
OA. rotates
OB. revolves
OC. explodes
OD
(vibrates
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