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3 years ago

How many neutrons would Oxygen-19 have

Chemistry

2 answers:

Softa [21]3 years ago

8 0

Oxygen has 7 neutrons

NemiM [27]3 years ago

4 0

Answer:

152 nutrons

Explanation:

this is because in one oxygen atom has 8 neutron then in 19 atoms it will be 8*19= 152

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When a paper towel absorbs water, is it a physical or chemical change?

Nonamiya [84]

Answer:

It is a physical change.

Explanation:

6 0

3 years ago

Please help with question 4 and 5 please!!

ratelena [41]

Question four is : Gaseous state

Question five is : A rise in temperature increases the kinetic energy and speed of particles; it does not weaken the forces between them. The particles in solids vibrate about fixed positions; even at very low temperatures. Individual particles in liquids and gases have no fixed positions and move chaotically.

Hope this helps!

Have a great day!

8 0

3 years ago

A student obtains a mixture of the chlorides of two unknown metals, X and Z. The percent by mass of X and the percent by mass of

Aleksandr-060686 [28]

<u>Answer:</u> The additional information that is helpful in calculating the mole percent of XCl(s) and ZCl(s) is the molar masses of Z and X

<u>Explanation:</u>

To calculate the mole percent of a substance, we use the equation:

$\text{Mole percent of a substance}=\frac{\text{Moles of a substance}}{\text{Total moles}}\times 100$

Mass percent means that the mass of a substance is present in 100 grams of mixture

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

We require the molar masses of Z and X to calculate the mole percent of Z and X respectively

Hence, the additional information that is helpful in calculating the mole percent of XCl(s) and ZCl(s) is the molar masses of Z and X

8 0

3 years ago

A piece of silver metal weighting 194.3g placed in graduated cylinder containing 242.0ml of water the volume of water now reads

Sav [38]

Explanation:

Volume of metal = 260.5ml - 242.0ml = 18.5ml

Density = Mass / Volume = 194.3 / 18.5 = 10.5g/cm³.

7 0

3 years ago

*PLEASE HELP* *IM SO STUCK ON THIS TEST I DONT UNDERSTAND ANY OF IT*

son4ous [18]

Remember that mass changes only occur because a gas is being released into the atmosphere or because a gas from the atmosphere is being used as a reactant -no atoms are created or destroyed only rearranged :-)

6 0

4 years ago