2 years ago

PLEASE HELP ME WITH THID IFK IT!! ILL GIVE YOU EXTRA POINTS

Chemistry

1 answer:

xenn [34]2 years ago

8 0

But a check at the bottom and x at the top

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12. What is the mass number of an atom that has 4 protons, 4 electrons, and 5 neutrons?

NeTakaya

Answer:

Explanation:

mass number = protons + neutrons

= 4 + 5 = 9

7 0

3 years ago

One of the reactions that occurs in a blast furnace, in which iron ore is converted to cast iron, is Fe2O3 + 3CO → 2Fe + 3CO2 Su

solong [7]

Answer:

$89.55~\%~of~Fe_2O_3~in~the~sample$

Explanation:

The first step in this reaction is the converstion from Kg of $Fe$ to grams of $Fe_2O_3$ .

$1.19x10^3~Kg~Fe~\frac{1000g~Fe}{1~Kg~Fe}~\frac{1~mol~Fe}{55.84~g~Fe}~\frac{1~mol~Fe_2O_3}{2~mol~Fe}~\frac{159.68~g~Fe_2O_3}{1~mol~Fe_2O_3}~\frac{1~Kg~Fe_2O_3}{1000~g~Fe_2O_3}$

$X~=~1.7x10^3~Kg~Fe_2O_3$

Then we can calculate the percentage of $Fe_2O_3$ in the sample:

$\%~Fe_2O_3~=~\frac{1.7x10^3~Kg~Fe_2O_3}{1.9x10^3~Kg~Sample}*100$

$89.55~\%~of~Fe_2O_3~in~the~sample$

3 0

3 years ago

A substance with a high [h ] would likely have which additional characteristics?

Ray Of Light [21]

Answer:

Is [h] really [H]? What characteristics are mentioned?

Explanation:

A high [H} means high acid concentration.

6 0

2 years ago

Help please !!!

docker41 [41]

Increase the force they are using to move the box by adding more helpers

Explanation:
If you want to increase the speed that the box is moving, increasing the friction would make it more difficult, decreasing the force they are using would just make it slower and increasing the angle of the ramp would make it harder. Adding more people would make it easier. “The more the merrier”

3 0

3 years ago

One atom of an element A =6.644 *10^-23 gm. calculate the no. of gram atom in 80 kg of it.

Oksana_A [137]

Answer:

5.3152*10^-24

Explanation:

3 0

3 years ago