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4 years ago

What is the uppermost, horizontal area of a page?

Chemistry

1 answer:

Nookie1986 [14]4 years ago

5 0

I think the answer is a and c

I

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Francine makes several measurements of the mass of a metal block. The data set is shown in the table below. Measurement Mass of

Lana71 [14]

The characteristic being calculated here is the mean or the average of the data set.
To check:
(20.73 + 20.76 + 20.68 + 20.75)/4 [we divide it by 4 because there are 4 numbers]
= 82.92 / 4
= 20.73

6 0

3 years ago

Read 2 more answers

Choose the mole ratio below that is INCORRECT based on the given balanced equation:

sdas [7]

Answer:

4 moles CO₂ = 4 moles O₂

Explanation:

The incorrect mole ratio is 4 moles CO₂ = 4 moles O₂.

Let us write the reaction equation:

2C₂H₅OH + 7O₂ → 4CO₂ + 6H₂O

To write mole ratios in a chemical reaction, we must ensure the equation is balanced.

Since the given expression is balanced,

Then 4 moles CO₂ = 4 moles O₂ is not correct;

Rather;

4 moles CO₂ = 7 moles O₂ is the right expression

6 0

3 years ago

What is the speed of a car that covers 250 miles in 5 hours?

Lapatulllka [165]

250miles is distance
5hours is time
Speed = distance/time
Speed = 250/5
Speed =50miles per hour
50mph

Hope that helps :)

5 0

2 years ago

If 5.58 g of iron reacts with sulfur to produce 8.79 g of iron sulfide, what is the mass of reacting sulfur? A) 3215 B) 14:37 C)

gogolik [260]

Answer: A) 3.21 g

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side.

$Fe+S\rightarrow FeS$

We are given:

Mass of iron = 5.58 g

Mass of iron sulphide = 8.79 g

Mass of sulphur = x g

Total mass on reactant side = 5.58 + x

Total mass on product side = 8.79 g

Applying law of conservation of mass, we get:

$5.58+x=8.79\\\\x=3.21g$

Hence, the mass of reacting sulfur is 3.21 g.

7 0

3 years ago

What is the total number of Joules of heat absorbed by 65.0 grams of water when the temperature of the water is raised from 25°C

Norma-Jean [14]

Answer:

Total number of heat absorbed is 4.08kJ

Explanation:

Explanation is contained in the picture attached

5 0

3 years ago