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suter [353]
2 years ago
8

32 You have two objects made of the same substance. Object 1 is a cube with a mass of 257.7 g. You measure the side of the cube

using a ruler and find it to be 3.17 cm. Object 2 is a sphere with a mass of 128.9 g. You find the volume of the sphere using water displacement. The volume of the water in a graduated cylinder initially is 120.0 mL, and when the sphere is added the new volume is 135.8 mL.
Chemistry
1 answer:
aleksandrvk [35]2 years ago
8 0

The complete question requires that we verify the density of both objects.

The density of object 1 is; 8.1g/cm³ while the density of object 2 is; 8.16g/cm³

<h3>Density of substances</h3>

The density of a substance is given as;

Density = Mass/Volume

Therefore, for Object 1;

  • Volume= l³ (for cubes)

Volume = (3.17)³ = 31.86cm³

Density (1) = 257.7/31.86 = 8.1 g/cm³

For Object 2;

  • Volume = 135.8 - 120 = 15.8mL

  • Volume = 15.8mL = 15.8 cm³

Density = 128.9/15.8

Density = 8.16g/cm³

Read more on density of substances;

brainly.com/question/6838128

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Explain how you determine the freezing point of a solution that does not have a well-defined transition in the cooling curve.
Sophie [7]

This question is asking for a method for the determination of the freezing point in a solution that does not have a noticeable transition in the cooling curve, which is basically based on a linear fit method.

The first step, would be to understand that when the transition is well-defined as the one on the attached file, we can just identify the temperature by just reading the value on the graph, at the time the slope has a pronounced change. For instance, on the attached, the transition occurs after about 43 seconds and the freezing point will be about 4 °C.

However, when we cannot identify a pronounced change in the slope, it will be necessary to use a linear fit method (such as minimum squares) to figure out the equation for each segmented line having a significantly different slope and then equal them so that we can numerically solve for the intercept.

As an example, imagine two of the segmented lines have the following equations after applying the linear fit method:

y=-3.5 x + 25\\\\y=-0.52 x + 2

First of all, we equal them to find the x-value, in this case the time at which the freezing point takes place:

-3.5 x + 25=-0.52 x + 2\\\\-3.5 x+0.52 x =2-25\\\\x=\frac{-23}{-2.98}=7.72

Next, we plug it in in any of the trendlines to obtain the freezing point as the y-value:

y=-3.5 (7.72) + 25\\\\y = 1.84

This means the freezing point takes place after 7.72 second of cooling and is about 1.84 °C. Now you can replicate it for any not well-defined cooling curve.

Learn more:

  • brainly.com/question/22818252
  • brainly.com/question/9680530

7 0
2 years ago
How many grams of water can be produce from the complete reaction of excess nitric acid and 33.2 mL of 0.245 M lithium hydroxide
Mariulka [41]

Mass of water produced : 0.146 g

<h3>Further explanation</h3>

Given

33.2 mL of 0.245 M lithium hydroxide

Required

mass of water

Solution

Reaction

HNO₃ (aq) + LiOH (aq) → H₂O (l) + LiNO₃ (aq)

mol LiOH :

= M x V

= 0.245 x 33.2 ml

= 8.134 mmol

From the equation, the mol ratio of HNO₃ : H₂O = 1 : 1, so mol H₂O = 8.134 mmol

mass H₂O :

= mol x MW

= 8.134 x 10⁻³ mol x 18 g/mol

= 0.146 g

3 0
2 years ago
Material deposited directly by a glacier is called ______.
jolli1 [7]
C. till .....................................................................
4 0
2 years ago
Read 2 more answers
Las Vegas Raiders' running back Josh Jacobs is 72 inches tall and has mass of 100 kg. Los
gladu [14]

Answer:

Josh is running at a speed of 9.09 yards per second.

Josh's velocity is 9.09 East.

Josh's force is 900 N.

Aaron Donald's force is 845 N.

Yes Josh scores the touchdown because he is faster and has more mass than Donald.

Explanation:

Josh scores the touchdown as he is heavier and faster than Donald.

Formulas are:

Force= mass x acceleration

Speed= distance divided by time.

Velocity= distance divided by time.

4 0
3 years ago
HELPPPPPP!!!!!!!!!!!!!!!!!!<br> NEED SOME HELP PLEASE!!!!!!!!!!!
Sergio039 [100]

Answer:

second

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Explanation:

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