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3 years ago

A student uses a lever and fulcrum to lift a rock off the ground.

Chemistry

2 answers:

chubhunter [2.5K]3 years ago

8 0

I think it’s b hope this helps

Sedaia [141]3 years ago

7 0

it has to me b because it shows what they did in this part

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What is the total number of carbon atoms in 10C4H10?

Katarina [22]

Answer:

40 C atoms

Explanation:

Step 1: Write organic compound

10C₄H₁₀

We see here that in 1 mol of C₄H₁₀, we would have 4 atoms of C.

We are given that we have 10 moles of C₄H₁₀.

Therefore, we have 4 · 10 = 40 atoms C

4 0

3 years ago

Where do reactions in a solid generally take place?

Sholpan [36]

Answer:

It's D. On the surface of the solid.

Explanation:

If the reactant is a solid, the surface area of the solid will impact how fast the reaction goes. This is because the two types of molecule can only bump into each other at the liquid solid interface, i.e. on the surface of the solid. So the larger the surface area of the solid, the faster the reaction will be.

3 0

3 years ago

Which type of electromagnetic radiation is most likely to be non-ionizing

Sunny_sXe [5.5K]

Answer:

A)Radio.

Explanation:

pls give me brainliest

7 0

3 years ago

Write the NET IONIC EQUATION between iron and copper (II) sulfate.

ratelena [41]

<u>Answer:</u> The net ionic equation is written below.

<u>Explanation:</u>

Net ionic equation of any reaction does not include any spectator ions.

Spectator ions are defined as the ions which does not get involved in a chemical equation. They are found on both the sides of the chemical reaction when it is present in ionic form.

The chemical equation for the reaction of iron and copper (II) sulfate is given as:

$Fe(s)+CuSO_4(aq.)\rightarrow FeSO_4(aq.)+Cu(s)$

Ionic form of the above equation follows:

$Fe(s)+Cu^{2+}(aq.)+SO_4^{2-}(aq.)\rightarrow Fe^{2+}(aq.)+SO_4^{2-}(aq.)+Cu(s)$

As, sulfate ions are present on both the sides of the reaction. Thus, it will not be present in the net ionic equation and are spectator ions.

The net ionic equation for the above reaction follows:

$Fe(s)+Cu^{2+}(aq.)\rightarrow Fe^{2+}(aq.)+Cu(s)$

Hence, the net ionic equation is written above.

7 0

3 years ago

An 8.65-g sample of an unknown group 2a metal hydroxide is dissolved in 85.0 ml of water. an acid-base indicator is added and th

garik1379 [7]

X(OH)₂ + 2HCl = XCl₂ + 2H₂O

n{X(OH)₂}=m{X(OH)₂}/M{X(OH)₂}

n(HCl)=c(HCl)v(HCl)

n{X(OH)₂}=n(HCl)/2

m{X(OH)₂}/M{X(OH)₂}=c(HCl)v(HCl)/2

M{X(OH)₂}=2m{X(OH)₂}/{c(HCl)v(HCl)}

M{X(OH)₂}=2*8.65/{2.50*56.9*10⁻³}=121.6 g/mol

M(OH)=17.0 g/mol
M(X)=121.6-17.0*2=87.6 g/mol ⇒ X=Sr, strontium

Sr(OH)₂ + 2HCl = SrCl₂ + 2H₂O

6 0

3 years ago

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