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3 years ago

• What is an ion, and what makes a compound "ionic"?

1 answer:

5 0

Ionic compounds are compounds made up of ions. These ions are atoms that gain or lose electrons, giving them a net positive or negative charge. Metals tend to lose electrons, so they become cations and have a net positive charge. ... Ions of opposite charge are held together by very strong ionic bonds within the compound.

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A car starts from rest and uniformly accelerates to a speed of 30 mi/h in 6 s. The car moves north the entire time. Which option

kirill115 [55]

Answer:

acceleration: 5 mi/h/s north

Explanation:

A quantity can be either vector quantity or scalar quantity, a vector quantity is a quantity with both magnitude and direction while a scalar quantity has magnitude only.

Examples of vector quantities include; velocity, acceleration, displacement , etc.

Acceleration is the rate of change of an object's velocity per unit of time. It is given by the formula; Velocity/time

Therefore in this case; a = 30 mi/h /6 s

= 5 mi/h/s

Therefore;

Acceleration = 5 mi/h/s

8 0

4 years ago

Select the correct statement (2.5 Points) (A) s-orbitals are spherical in shape. (B) P-orbitals are dumbbell in shape. (C) s-orb

Lilit [14]

Answer:

The correct option is: (D) All of the above

Explanation:

An atomic orbital is the three-dimensional space or region around the nucleus of an atom, where the probability of finding an electron is maximum.

The s-orbitals are the atomic orbitals that have azimuthal quantum number, l = 0. These atomic orbitals have spherical shape and symmetry.

The p-orbitals are the atomic orbitals that have azimuthal quantum number, l = 1. These atomic orbitals have a dumbbell shape.

The atomic orbitals that are closer to the nucleus, have lower energy. Therefore, we can say that the s-orbitals are lower in energy than the p-orbitals.

6 0

3 years ago

A cube of plastic 1.2x10^-5 km on a side has a mass of 1.1 g. what is its density in g/cm^3

Vesna [10]

Length of 1 side 1.2*10^-5km =1.2*10^-5*10^5 =1.2cm

volume of the cube (1.2)^3=1.728 cm^3 

density= mass/volume= 1.1/1.728=0.636 g/cm^3

7 0

4 years ago

Read 2 more answers

Very important! True or false ?Atoms with fewer than 4 outer electrons lend electrons?

Zigmanuir [339]

False because it can be more than that

4 0

3 years ago

The reaction of hydrogen bromide(g) with chlorine(g) to form hydrogen chloride(g) and bromine(g) proceeds as follows: 2HBr(g) +

VladimirAG [237]

Answer:

The enthalpy of reaction per mole of HBr for this reaction = ΔrH = -40.62 kJ/mole.

Explanation:

2HBr(g) + Cl2(g) → 2HCl(g) + Br2(g)

When 23.9 g HBr(g) reacts with sufficient Cl2(g), 12.0 kJ of heat is evolved, calculate the value of ΔrH for the chemical reaction.

Note that ΔrH is the enthalpy per mole for the reaction.

Molar mass of HBr (g) = 80.91 g/mol.

Hence, 1 mole of HBr = 80.91 g

23.9 g of HBr led to the reaction giving off 12.0 kJ of heat

80.91 g of HBr will lead to the evolution of (80.91 × 12/23.9) = 40.62 kJ heat is given off.

Hence, 40.62 kJ of heat is given off per 80.91 g of HBr.

This directly translates to that 40.62 kJ of heat is given off per 1 mole of HBr

Hence, the heat given off per mole of HBr for this reaction is 40.62 kJ/mole.

But since the reaction liberates heat, it means the reaction is exothermic and the enthalpy change for the reaction (ΔHrxn) is negative.

Hence, ΔrH = -40.62 kJ/mole.

Hope this Helps!!!

8 0

3 years ago