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3 years ago

Chemicals integrate to kill insects and other pests that damage crops are

Chemistry

2 answers:

belka [17]3 years ago

5 0

I believe the answer is pesticides

Artemon [7]3 years ago

4 0

Hello,

Farmer's use many chemicals on their crops. The specific chemical you are looking for is Insecticides. Insecticides are specifically for crops, and it is used to kill insects and bugs. There are three different kinds of pesticides, and the one that mainly kills bugs in insecticides

- I . A -

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Gold is alloyed with other metals to increase its hardness in making jewelery.a) Consider a piece of gold jewelry the weighs 9.8

irinina [24]

Answer:

A). Percentage of gold by mass of the jewellery =

(6.059÷9.85) × 100 = 61.5%

B). Purity of the gold = 0.615 × 24 = 14.76 karat ~ 15 karat gold

Explanation:

Mass of jewellery = 9.85g Volume of jewellery = 0.675cm^3.

Density of gold = 19.3g/cm^3 and density of silver = 10.5g/cm^3

Let the volume of gold in the jewellery be X and the volume of silver in the jewellery be Y

Hence we have

Density = mass/volume or mass = volume × density = for gold = X × 19.3g/cm^3 and for the silver = Y × 10.5g/cm^3

19.3X +10.5Y = 9.85g

Also volume of jewellery is given by

Volume of silver in the jewellery + volume of gold in the jewellery = 0.675cm^3.

X + Y = 0.675cm^3.

Solving the above equations we have

Y = 0.675 - X

Which gives

19.3X + 10.5Y = 9.85g

19.3X + 10.5 × (0.675 - X) =9.85g

19.3X + 7.0875 - 10.5X = 9.85

8.8X + 7.0875 = 9.85

8.8X = 2.7625

or X = 0.3139 cm^3

But Y = 0.675 - X

Hence Y = 0.675 - 0.3139 = 0.3611 cm^3

Mass of gold in the jewellery = volume of gold × Density of gold = 0.3139 × 19.3 = 6.059 g

Also mass of silver = 10.5 × 0.3611 = 3.7913g

A). Percentage of gold by mass of the jewellery =

(6.059÷9.85) × 100 = 61.5%

B). Purity of the gold = 0.615 × 24 = 14.76 karat ~ 15 karat gold

7 0

3 years ago

A paint chip is placed in ethanol and curls what type of paint is it

Licemer1 [7]

Answer:

it is probably acrylic or latex

Explanation:

3 0

3 years ago

HELP ASAP 20 OR MORE POINTS!!!!

pishuonlain [190]

<h2>YeS im Am fRom pLanet k12 And brinG anD imPortant MesSage </h2>

The answer to your question is, <u><em>There are only so many ways matter can arrange itself within that infinite universe.</em></u>

<h2><em>Also if your on the same test as me heres some other sTuff that was on my test </em></h2><h2><em> </em></h2>

Question 1 (1 point)

In Brian Greene's "A Physicist Explains Why Parallel Universes May Exist", what reason does Greene give for why he believes parallel universes may exist?

<em>Answer: There are only so many ways matter can arrange itself within that infinite universe.</em>

<em> </em>

Question 2 (1 point)

Choose the best explanation for why we experience the Mandela Effect.

<em>Answer: Our brains tend to fill in information that we cannot readily recall and make associations that are not true.</em>

Question 3 (1 point)

From the article "Time Travel Is A Fun Science Fiction Story But Could It Be Real?", Albert Einstein's Theory of Relativity is described as what?

<em>Answer: The pulling force of gravity causes space to curve and causes time to slow down.</em>

Question 4 (1 point)

From the video " Are Wormholes The Answer To Time Travel?", how are worm holes described?

<em>Answer: A tunnel in space connecting two regions very distant from each other. A "short cut" through space</em>

Question 5 (1 point)

Many scientists think human cloning is possible, so why haven't we made human clones yet?

<em>Answer: Human cloning is extremely controversial and many people believe it is unethical</em>

<h2><em>HOPE THIS HELPS ANYONE IF IT DOES THANK AND RATE FOR A FREE COOKIE :D </em></h2>

6 0

3 years ago

Read 2 more answers

why a gas, at constant pressure, increases greatly in volume when it is gently heated but a solid does not

11Alexandr11 [23.1K]

Explanation:

This is because gas particles are free to move as they are not held in place by strong molecular forces while particles in a solid are

8 0

3 years ago

What would be the temperature of 0.6 moles of fluorine that occupy 15 L at 2,300 mmHg?

Anna [14]

Answer: The temperature of 0.6 moles of fluorine that occupy 15 L at 2,300 mmHg is 920 K

Explanation:

According to ideal gas equation:

$PV=nRT$

P = pressure of gas = 2300 mm Hg = 3.02 atm (760mmHg=1atm)

V = Volume of gas = 15 L

n = number of moles = 0.6

R = gas constant = $0.0821Latm/Kmol$

T =temperature = ?

$T=\frac{PV}{nR}$

$T=\frac{3.02atm\times 15L}{0.0821Latm/K mol\times 0.6mol}=920K$

Thus the temperature of 0.6 moles of fluorine that occupy 15 L at 2,300 mmHg is 920 K

8 0

3 years ago