1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
kumpel [21]
3 years ago
6

In the video, the water level was 15 milliliters before adding the chain, and 20 milliliters after adding the chain. When I weig

hed the chain, its mass was 66.7 grams.
I believe the chain is solid metal (not gold plated), but is probably a blend of gold and other metals. I looked up that gold has a density of 19.3 g/ml, while the other metals like silver and copper usually blended with gold have a combined density of about 9.7 g/ml.

Determine what percentage of the chain is gold, by mass, to at least 1 decimal place?

Whats the procedure?
Mathematics
1 answer:
mr_godi [17]3 years ago
7 0

Answer:

  • 39.7%

Explanation:

<u />

<u>1. First find the density of your chain</u>

  • Density = mass / volume

  • Volume = displaced water volume

                      = Volume of Final level of water - initial level of water

                     = 20 ml - 15 ml = 5 ml

  • Mass = 66.7 g

  • Density = 66.7g / 5 ml = 13.34 g/ml

<u />

<u>2. Second, write the denisty of the chain as the weighted average of the densities of the other metals:</u>

Mass of gold × density of gold + mass of other metals × density of other metals, all divided by the mass of the chain.

Calling x the amount of gold, then the amount of other metals is 66.7 - x:

        \dfrac{19.3\cdot x+9.7\cdot (66.7-x)}{66.7}=13.34

       19.3x+635.66-9.7x=889.778

      9.6x=254.118\\\\x=26.47

Then, there are 26.47 grams of gold in 66.7 grams of chain, which yields a percentage of:

  • (26.47 / 66.7) × 100 = 39.7%
You might be interested in
Find Y. Do not round answer.
galben [10]

Answer:

Does the answer help you?

4 0
2 years ago
Read 2 more answers
Please help, I'm really desperate here
weqwewe [10]

Answer:

If ur desperate

Step-by-step explanation:

You should ask people to help you, like me.

8 0
3 years ago
Solve the quadratic equation (2x+5)(2x-5)
mote1985 [20]
If you want to multiply (2*x + 5) and (2*x - 5), you can do this using the following steps:

(2*x + 5) * (2*x - 5) = 4*x^2 - 10*x + 10*x - 25 = 4*x^2 - 25

The correct result is 4*x^2 - 25.
4 0
3 years ago
What are like​ terms? Provide an example with your description. Choose the correct answer below. A. Like terms are terms that ha
ExtremeBDS [4]

Answer:

Option C.

Step-by-step explanation:

We need to find the correct definition of like terms.

Like terms :Two or more terms are called like terms if they have the same variables and same powers.  

For example : 4xy and 9xy are like terms.

Option A is incorrect because 3x and 3 are not like terms.

Option B is incorrect because 6x and 9 are not like terms.

Option C is correct because like terms are terms that have the same variable factors as well as the same number of factors of each type. For​ example, 3x and 5x are like terms.

Option D is incorrect because 3x and 5 are not like terms.

Therefore, the correct option is C.

8 0
3 years ago
Can someone please help me with this one?
vazorg [7]

3 = 2 by z property

Step-by-step explanation:

Congruence criteria for triangles

If two sides and the angle between them in one triangle have the same measures as two sides and the angle between them in another triangle, then the triangles are congruent.

Please mark as brainliest

4 0
3 years ago
Other questions:
  • Find the mean of the integers.<br><br> −3,−8,12,−15,9
    5·2 answers
  • Dinh finished part of her reading homework, reading 20 of the 25 assigned pages. Explain how to find the percent of her reading
    15·1 answer
  • How can you remember the difference between supplementary and complementary angles
    9·1 answer
  • Divide 32 in ratio of 3:7
    13·1 answer
  • Which integer represents a loss of 11 yards in a football game?
    15·1 answer
  • I need help with my khan, plz help meeee (7th-grade math)
    8·1 answer
  • There are 1200 students in a school. 1/5 of the students are majoring in science. Of the science majors 30% are biology majors.
    7·1 answer
  • Similarly please help
    15·1 answer
  • Find the area of the shaded region. Round your answer to the nearest hundredth.
    12·1 answer
  • ramesh took a loan of rs 50000 from urmila at the rate of 10%p.a. if he paid half of the principal and all the interest at the e
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!