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Paul [167]
3 years ago
15

BEST ANSWER = BRAINIEST !1.What will the weather most likely be like the day a cold front arrives?

Chemistry
1 answer:
nirvana33 [79]3 years ago
7 0
1.B
2.C
3.C
4.D
5.D
I hope this helps!
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The coin of silver (ag) having 8.5 grams weight.calculate the number of moles of silver in coin
AfilCa [17]

0.0788 will be the number of moles of silver in coin.

<h3><u>How to find the number of moles?</u></h3>

A mole is the mass of a material made up of the same number of fundamental components. Atoms in a 12 gram example are identical to 12C. Depending on the material, the fundamental units may be molecules, atoms, or formula units.

A mole fraction shows how many chemical elements are present. The value of 6.023 x 10²³ is equivalent to one mole of any material (Avagadro's number). It can be used to quantify the chemical reaction's byproducts. The symbol for the unit is mol.

The number of moles formula is denoted by the following expression:

Number of moles = Mass of substance/mass of one mole

To view more about number of moles, refer to:

brainly.com/question/14080043

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6 0
1 year ago
sound travels at 331m/s. How long would it take for sound to travel across lake tahoe, which is 21.6 miles long
vesna_86 [32]

Answer:

It would take sound <em><u>104.998 seconds</u></em> to travel across lake tahoe.

Explanation:

First let's convert the miles to meters, so, 21.6 miles = 34754.4 meters

Now, we will divide this number in meters by 331. So, 34754.4 / 331 = 104.998

And what will the unit be? Seconds will be the unit for time here so 104.998 seconds.

       

7 0
3 years ago
Given 200ul of a 0.5mg/ml stock solution of BSA, how much do you pipet into a test tube so that you are adding 5ug of BSA to the
Trava [24]

<u>Answer: </u>10\mu L of volume needs to be pipetted out in the test tube.

<u>Explanation:</u>

We are given:

Mass of BSA to be formed = 5\mu g=0.005mg      (Conversion factor: 1mg=1000\mu g

Volume of stock solution = 200\mu L=0.2mL    (Conversion factor: 1mL=1000\mu L

It is also given that for the mass of BSA is 0.5 g, the volume used up is 1 mL

In order to have, 0.005 g, the volume of stock solution needed will be = \frac{1mL}{0.5g}\times 0.005g=0.01mL=10\mu L

Hence, 10\mu L of volume needs to be pipetted out in the test tube.

3 0
3 years ago
The images below show two commonly observed changes.
Bas_tet [7]
The correct answer is:  [A]: 
________________________________________________
                   "Picture I shows a chemical change, because a new                               substance is formed."
__________________________________________________________
Note:   "Picture II" is a "physical change" because it is a "phase change"—no "new substance" is form; rather, the same substance changes form.
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True or False: Neutrons have both a positive and negative charge
uysha [10]

Answer:

false

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