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Mazyrski [523]
3 years ago
8

What are primary observations in science?

Chemistry
1 answer:
Nookie1986 [14]3 years ago
5 0

Answer:

Observation is the active acquisition of information from a primary source. In living beings, observation employs the senses. In science, observation can also involve the recording of data via the use of scientific instruments. The term may also refer to any data collected during the scientific activity.

Explanation:

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Explain why a total lunar eclipse appears red.<br> I
DochEvi [55]

Answer:

During a total lunar eclipse, the Earth lies directly between the sun and the moon, causing the Earth to cast its shadow on the moon.

Explanation:

4 0
3 years ago
1) A 10g sample of H2(g) reacts with a 22g sample of O2(g) according to
solmaris [256]

Answer:

H₂ is excess reactant and O₂ the limiting reactant

Explanation:

Based on the chemical reaction:

2H₂(g) + O₂(g) → 2H₂O

<em>2 moles of H₂ react per mole of O₂</em>

<em />

To find limiting reactant we need to convert the mass of each reactant to moles:

<em>Moles H₂ -Molar mass: 2.016g/mol-:</em>

10g H₂ * (1mol / 2.016g) = 4.96 moles

<em>Moles O₂ -Molar mass: 32g/mol-:</em>

22g O₂ * (1mol / 32g) = 0.69 moles

For a complete reaction of 0.69 moles of O₂ are needed:

0.69mol O₂ * (2mol H₂ / 1mol O₂) = 1.38 moles of H₂

As there are 4.96 moles,

<h3>H₂ is excess reactant and O₂ the limiting reactant</h3>
7 0
4 years ago
An aqueous solution of perchloric acid is standardized by titration with a 0.191 M solution of barium hydroxide. If 13.8 mL of b
WARRIOR [948]

Answer:

Molarity of HClO_{4} solution is 0.311 M

Explanation:

Neutralization reaction: 2HClO_{4}+Ba(OH)_{2}\rightarrow Ba(ClO_{4})_{2}+2H_{2}O

According to balanced reaction, 1 mol of Ba(OH)_{2} neutralizes 2 moles of HClO_{4}

Number of moles of Ba(OH)_{2} in 13.8 mL of 0.191 M Ba(OH)_{2} solution = \frac{0.191}{1000}\times 13.8moles = 0.00264moles

Let's assume molarity of HClO_{4} solution is C (M) then-

Number of moles of HClO_{4} in 17.0 mL of C (M) HClO_{4} solution = \frac{C}{1000}\times 17.0moles = 0.017Cmoles

Hence, 0.017C=(2\times 0.00264)

         or, C=0.311

So, molarity of HClO_{4} solution is 0.311 M

3 0
3 years ago
When one metal mixes into the crystalline lattice of another it is called a(n)
ikadub [295]

Answer:

it would be an alloy

Explanation:

 It is a type of substance that is made by the melting of two or more elements together.

3 0
3 years ago
Read 2 more answers
19. Why should all measurements be done multiple times?
Alja [10]

Answer:

Increasing precision with multiple measurements

Explanation:

The more measurements you take (provided there is no problem with the clock!), the better your estimate will be. Taking multiple measurements also allows you to better estimate the uncertainty in your measurements by checking how reproducible the measurements are.

8 0
3 years ago
Read 2 more answers
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