What type of reaction takes place when atoms or molecules rearrange to form new substances?

HELP!!! I need collision covalent level 16 ASAP!!

yan [13]

Answer:

The data to represent average test scores for a class of 16 students includes an outlier value of 78. if the mean, including the outlier of 78, equals 84, which statement is always...

Explanation:

8 0

3 years ago

Which of the following objects has the greatest kinetic energy?

kap26 [50]

Answer:

A.

Explanation:

All about mass and velocity... So if they all have the same mass, you're looking for which has the most velocity to find which has the greatest kinetic energy.

5 0

3 years ago

3. In a neutral atom, this element has an atomic mass of 23 AMU and has 11 protons.

notka56 [123]

The element in question is Sodium

An atomic mass unit is defined as 1/12 th of the mass of carbon-12 atom.

The mass of an atom is mainly due to its protons and neutrons in the nucleus.

Weight of a proton is 1.6 x 10^-27 kg

Weight of a neutron is 1.6 x 10^-27kg

However weight of an electron is 9 x 10^-31kg and hence is negligible in calculation of amu

It is given that weight is 23 AMU and number of protons is 11

The protons in a nucleus also act as atomic number of the periodic table

Proton number 11 is the atomic number of Sodium

Hence the element is Sodium

For further reference:

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4 0

2 years ago

For dilute aqueous solutions in which the density of the solution is roughly equal to that of the pure solvent, the molarity of

EleoNora [17]

Explanation:

Given: Molarity = 0.01 M

Let the volume of the solution = 1 L

Hence, moles = 0.01 moles (Molarity*Volume)

Molar mass of urea = 60 g/mol

So, mass of urea = moles x molar mass = 0.01 moles x 60 g/mol = 0.6 g = 0.0006 kg ,

Given: Density of solvent = Density of solution = 1 Kg/liter (Water).

So,

The mass of solution = vol x density = 1 L x 1 kg/L= 1 kg

Also,

Mass of solution = Mass of solute + Mass of solvent

1 kg= 0.0006 kg + mass of solvent

Mass of solvent = 1-0.0006 = 0.9994 kg

Molality is the moles of solute present in 1 kg of the solvent. So,

Molaity = ( 0.01/0.9994) ≈ 0.01 m

Molarity = Molality

Hence proved.

3 0

4 years ago

When the NaOH dissolves, the temperature of the solution increases from 18.2 C to 24.5 C. Assuming the specific heat and density

ELEN [110]

Answer:

The heat of solution is 1.05 kJ/mol

Explanation:

NaOH → Molar mass 40 g/m

This is the mass in 1 mol

Calorimetry formula:

Q = m . c . ΔT

ΔT = T° final - T° initial = 24.5°C - 18.2°C = 6.3°C

mass = 40 g

c = 4.186 kJ/kg°C (the same as water)

So we have to convert 40 g to kg

40 g/1000 = 0.04 kg

Q = 0.04 kg . 4.186 kJ/kg°C . 6.3 °C = 1.05 kJ

7 0

4 years ago