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3 years ago

The properties of compounds are (what?) to the elements that make it up. *

2 answers:

8 0

Answer:A compound is a unique substance that forms when two or more elements combine chemically. A compound always has the same elements in the same proportions. The properties of compounds may be very different from the properties of the elements that form them. Some compounds form rigid frameworks called crystals.

Explanation:

lyudmila [28]3 years ago

3 0

Answer:

An element or compounds’ physical properties are far easier to detect. These properties are things that can be observed without changing the identity of the element or compound. These properties include color, smell, freezing point, boiling point, melting point, opacity, viscosity, and density.

Explanation:

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2. What is one effect of convection currents in the mantle?

Rom4ik [11]

Answer:

D no. is the answer of your question

8 0

3 years ago

Is 0.2 liters of soda the same measurement as 2000 grams of soda

vesna_86 [32]

Answer:

0.2 liters = 200 grams

Explanation:

G = L x 1000

G= 0.2 x 1000

G= 200g

3 0

2 years ago

Need help please it must be right thank u

vova2212 [387]

Answer:

13. c) Net

14. a) Gravity

15. d) Watt

16. b) the speed will suddenly decrease.

Explanation:

13. The net force is combination of all individual forces.

14. When we sit on the chair , then gravitational force acts on our body due to our mass.

F = mg

here, F = force due to gravity , g = acceleration due to gravity and m= mass of the body

15.Power : It is the force acting per unit area .It is discovered by James Watt

$Power =\frac{force}{area}$

$Power =\frac{N}{m^{2}}$

Its unit is $Nm^{-2}$ .In honor of the Scientist , its unit is Watt.

Watt = $Nm^{-2}$

16. When the parachute first opens , the speed of the skydiver suddenly decreases because of the resistance offered by the air particles.(For more details look at the figure attached)

17. Transfer of momentum from one object to other is the law of conservation of momentum (NOT ENERGY).So the answer is False

 Law of Conservation of Momentum :  Total momentum of a system is conserved if no external force attack on it. Momentum can neither be created nor destroyed but transferred from one form to other.

7 0

3 years ago

How many moles and molecules are there in 250g of hydrogen nitrate, HNO3

Viefleur [7K]

Answer:

Number of molecules = 23.9 × 10²³ molecules

Number of moles = 3.97 mol

Explanation:

Mass of HNO₃ = 250 g

Number of moles = ?

Number of molecules = ?

Solution:

Number of moles = mass / molar mass

Number of moles = 250 g/63 g/mol

Number of moles = 3.97 mol

Number of molecules:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

For 250 g of HNO₃:

250 g/ 63 g/mol = 3.97 mole

3.97 × 6.022 × 10²³ molecules = 23.9 × 10²³ molecules

6 0

3 years ago

The last column of the periodic table contains the noble gases elements that do not easily form chemical bonds. Why don’t these

ozzi

Answer:

its is because the chemicals are very diffraction from each other so which makes it difficult to form a chemical bond.

6 0

3 years ago