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cestrela7 [59]
3 years ago
7

Isotopes of an element have the same number of ________ and different numbers of ________. neutrons... protons protons... neutro

ns electrons...protons protons...electrons
Chemistry
1 answer:
Ivahew [28]3 years ago
8 0
Protons . . . neutrons
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Bill has a set of 6 black cards and a set of 6 red cards. Each card has a number from 1 through 6, such that each of the numbers
makvit [3.9K]

Answer:

\frac{17}{33}

Explanation:

The probability of finding at least on pair is equal to 1 minus the probability of finding no pair. If x represents the number of pairs obtained in a game we have that:

P(x\geq 1)=1-P(x=0)

Now lets consider the a game in which no pairs are obtained. The first card can be any, so we have 12 out 12 cards. The second card can't be the one matching the first card, so we have 10 out of 11. Similarly for the 3rd and 4th cards, we obtain:

P(x=0)=\frac{12}{12} \frac{10}{11} \frac{8}{10} \frac{6}{9} =\frac{16}{33}

This results in

P(x\geq 1)=1-\frac{16}{33}=\frac{17}{33}

5 0
3 years ago
Some students observe four different lab investigations. The students record their observations in a table.
Sati [7]

Answer:

Number 4 is an example of a chemical reaction

Explanation:

heThe chalk is reacting with the vingear which is creating a new substance. The new substance is the gas that the reaction gives off.

3 0
2 years ago
Read 2 more answers
Electronic configurations and charges of the ions<br>in lithium fluoride?​
BARSIC [14]

Answer:

Explanation:

The electronic configuration of a lithium atom is 2.1 and that of a fluorine atom is 2.7

an atom of lithium donates an electron to an atom of fluorine to form an ionic compound. The transfer of the electron gives the lithium ion a net charge of +1, and the fluorine ion a net charge of -1.

7 0
3 years ago
How many grams of KNO3 would recrystallize from 100 g of water, if a saturated solution were cooled from 50 degrees celcius to 2
Lelechka [254]

Answer:

m_{cryst}=58g

Explanation:

Hello there!

In this case, according to the attached solubility chart, it is possible for us to realize that about 88 grams of KNO3 are soluble at 50 °C but just 30 grams are soluble at 20 °C in the same 100 g of water.

In such a way, the crystalized mass of this solute can be calculated by subtracting the mass at 50 °C and the mass at 20 °C:

m_{cryst}=88g-30g\\\\m_{cryst}=58g

Best regards!

8 0
3 years ago
A is a continuous loop of moving air or liquid that transfers energy.
avanturin [10]
A convection current
5 0
3 years ago
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