CHEMISTRY MIDDLE SCHOOL

What does the drop in barometric pressure from 1003 millibars to 926 millibars tell  you about a hurricane?

Answers

Answer 1
Answer: The pressure has decrease meaning the hurricane is less powerful
Answer 2
Answer:

The pressure has decrease meaning the hurricane is less powerful

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QUICK!!!20 POINTS + BRAINLIEST!!!How to test whether a vegetable or fruit can conduct electricity?

Answers

Using a *MULTIMETER* is the best way to test and compare each fruit and vegetable. Because each fruits or vegetables all have different conductivity levels!

(Mark this as the brainliest if this helps!)

What is the [H30+) in a solution with (OH'] = 2.0 x 10-3 m?2.0 x 10-3M
5.0 x 10-11M
2.0 x 10-12M
5.0 x 10-12 M
1.0 10-12 M

Answers

Answer: 5.0 x 10-12 M

Explanation:

It is well known that; pH + pOH = 14.

pOH = - log [ OH-]

        =  - log [ 2.0 x 10 ∧-3]

        =  3 - log 2

        =   3  - 0.301 = 2.7 approximately.

recall that, pH + pOH = 14, therefore; pH = 14 - 2.7 = 11.3

pH= - log [ H3O+]

11.3 =  - log [H3O+], take the antilog of 11.3, gives us;

[H3O+] = antilog of - 11.3, which gives 5.0 x 10-12 M

List the three layers of the earth bad

Answers

core, mantle and the crust
core,mantle, and crust 

How is Earth like a magnet

Answers

Earth's magnetic field is mostly caused by electric currents in the liquid outer core, which is composed of conductive, molten iron. Loops of currents in the constantly moving, liquid iron create magnetic fields. From afar, the Earth looks like a big magnet with a north and south pole like any other magnet.
Earth's magnetic field is mostly caused by electric currents in the liquid outer core, which is composed of conductive, molten iron. Loops of currents in the constantly moving, liquid iron create magnetic fields. From afar, the Earth looks like a big magnet with a north and south pole like any other magnet.

A scientist finds an organism that cannot move. It has many cells and get food from its environment. In which Kingdom does it

Answers

an organism that does not move on its own and makes food from its environment is a producer.

1. Aqueous solutions of chromium(III) iodide and sodium hydroxide react to give a chromium(III) hydroxide precipitate and aqueous sodium iodide.2. Aqueous solutions of iron(II) sulfate and barium nitrate react to give a barium sulfate precipitate and aqueous iron(II) nitrate.

Express your answer as a chemical equation. Identify all of the phases in your answer. Enter noreaction if there is no reaction.

Answers

1- The original equation of the reaction is :
CrI3 + NaOH → Cr(OH)3 + NaI 
but this is not a balanced equation so we have to balance it :
-first, we have 3 I atoms on the left side and 1  I atom on the right side 
so to makes the no.of atoms on both sides equal we put 3NaI instead of NaI
CrI3 + NaOH → Cr(OH)3 + 3NaI
- then no.of Na atoms on the left side is 1 and on the right side is 3 so, we put 3NaOH instead of NaOH
CrI3 + 3NaOH → Cr(OH)3 + 3NaI
now we have :
Cr atoms = 1 on both sides
I atoms = 3 on both sides
Na atoms = 3 on both sides
O&H atoms = 3 on both sides
So the final balanced equation of our reaction is:
CrI3(aq) + 3NaOH(aq) → Cr(OH)3(s) + 3NaI(aq)

2 - the chemical equation of the second reaction is :
FeSO4 + Ba(NO3)2 → BaSO4 + Fe(NO3)2
let's see if it is the balanced equation or not?
we have:
no of Fe atom on both sides = 1
no of (SO4) atom on both sides are equal
 no of Ba atom on both sides = 1
no of (NO3) group on both sides= 2 
so this is our balanced equation, so the final equation for this reaction is:
FeSO4(aq) + Ba(NO3)2(aq) →BaSO4(s) + Fe(NO3)2(aq)
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