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Natasha2012 [34]
3 years ago
9

At STP or standard conditions, which list of elements contains a solid, a liquid, and a gas?

Chemistry
1 answer:
SIZIF [17.4K]3 years ago
4 0

Answer:

B.hafnium, mercury,helium

Explanation:

because the atomic number of hafnium is 72is a solid, mercury is a gas the atomic number is 80,

helium is a gas the atomic number is 2

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The standard heat of formation for solid copper is zero. True False
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The answer is false. 

3 0
3 years ago
In an endothermic reaction which bonds are stronger? The reactants or products? Explain
Marina86 [1]

reactants because it had other chemicals, when more are mixed it will be more stronger.

It is the correct answer

6 0
3 years ago
How does the properties of matter in liquid and gas state allow the Herons fountain to work?
Varvara68 [4.7K]

Answer:

Heron's fountain is an hydraulic machine that works because or the pressure inside of the system. Water will flow from high gravitational potential energy to low gravitational potential energy. The two sides of the system will present different pressure because they have different fluids in it (water and air) and  water pressure is higher than gas/air pressure, so it will flow.

It is important to take into account that the pressure in the columns is a function of the height of the fluid (water or air).

Explanation:

<u>The properties of liquid:</u>

- If a liquid is poured into a container, it will adapt to the container's shape

- In a liquid state, the molecules have a kinetic energy higher than in a solid state

- Liquid particles are not arranged in a regular way but they are very close  to each other, that's why liquids have a definite volume.

- Force is spread in an even way through a liquid, so the liquid particles are displaced if an object is placed in it.

- Liquids, as solids, can't be compressed

<u>The properies of gas:</u>

- They are everywhere

- Gas molecules are disorganized and have a great deal of space between them

- Gas fill up any container and spread indefinitely

- Gas molecules have a high kinetic energy

- If gas is put under pressure, the space between particles will decrease and collisions between them will increase.

- If the temperature of the gas increases in a container, the pressure will increase; if the temperature decreases, the pressure sill decrease.

- It can be compressed

- Gas has no definite volume nor definite shape.

8 0
3 years ago
How manymoles of each ion are present in 175 mL of 0.147 M Fe2(SO4)3?
lilavasa [31]

Answer: 0.0257 moles of Fe^{3+}  and 0.0257 moles of SO_4^{2-}

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

Molarity=\frac{moles}{\text {Volume in L}}

moles of  Fe_2(SO_4)_3=Molarity\times {\text {Volume in L}}=0.147\times 0.175L=0.0257moles

The balanced reaction for dissociation will be:

Fe_2(SO_4)_3\rightarrow Fe^{3+}+SO_4^{2-}

According to stoichiometry:  

1 mole of Fe_2(SO_4)_3 gives 1 mole of Fe^{3+}  and 1 mole of SO_4^{2-}

Thus there will be 0.0257 moles of Fe^{3+}  and 0.0257 moles of SO_4^{2-}

8 0
3 years ago
TWO HYDROGEN ATOMS COMBINE TO FORM HELIUM ATOMS RESULTING IN THE FORMATION OF...
motikmotik

when two heavy hydrogens combine to for helium , it results in the formation of energy, and a neutron, along with the helium atom

3 0
3 years ago
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