Chemistry291

Chlorine has the electron configuration 1s22s22p63s23p5. How many valence electrons does it have? Answer: Chlorine has the electron configuration 1s22s22p6 3s23p5. So,i t has seven (2 +5 =7)  valence electrons. Explanation: Chlorine has the electron configuration 1s22s22p6 3s23p5. So the outermost shell or valence shell is  3s23p5. Now count the number of valence electrons present here.It has seven (2 +5 =7) valence electrons. Next

  The electron configuration of nitrogen is 1s2 2s2 2p3 . How many electrons are in a nitrogen atom? Answer: The electron configuration of nitrogen is 1s ²  2s ²  2p ³  . From this electron configuration ,we can say that  there are seven electrons ( 2 + 2 + 3 =7 ) in a nitrogen atom. Next

Which salt is produced when NaOH reacts with HCl?  Select one from the following: A) KCl B) NaCl C) NH4Cl  D) NH4NO2 Answer: (B) Sodium chloride salt (NaCl) is produced when Na OH reacts with HCl. Explanation: NaOH  is  a base and HCl is an acid.So acid-base reaction will happen and we will get salt and water. NaOH + HCl ----->NaCl +H₂O Next

Solution: The third number of this sequence is 24. Explanation: We need to find out the  third  number    from    consecutive integer numbers' sequence.                          Step-1: We have to have knowledge about integer number.An integer number does not have any fractional part.It can be positive or negative number. Now you have to understand about consecutive integer number.The difference between two consecutive integer numbers    is always 1.                    Step-2: Say,the first integer number is x. So, the second integer number will be x+ 1. Thus, the third consecutive integer number will be x+2  .Besides,the fourth integer number will be x+3 and the fifth number will be x+4 . Have a look here. The five ...

Solution: The third number of this sequence is 101. Explanation: We need to find out the  third  number    from    consecutive integer numbers' sequence.                          Step-1: We have to have knowledge about integer number.An integer number does not have any fractional part.It can be positive or negative number. Now you have to understand about consecutive integer number.The difference between two consecutive integer numbers    is always 1.                    Step-2: Say,the first integer number is x. So, the second integer number will be x+ 1. Thus, the third consecutive integer number will be x+2  .Besides,the fourth integer number will be x+3 and the fifth number will be x+4 . Have a look here. The five consecuti...

Solution: The fourth number of this sequence is 23. Explanation: We need to find out the  fourth  number    from    consecutive integer numbers' sequence.                          Step-1: We have to have knowledge about integer number.An integer number does not have any fractional part.It can be positive or negative number. Now you have to understand about consecutive integer number.The difference between two consecutive integer numbers    is always 1.                    Step-2: Say,the first integer number is x. So, the second integer number will be x+ 1. Thus, the third consecutive integer number will be x+2  .Besides,the fourth integer number will be x+3 and the fifth number will be x+4 . Have a look here. The five consecut...

    The sum of 4 consecutive integers is 180. What is the smallest number in the group? Solution: We need to find out the  smallest  number    from    consecutive integer numbers' sequence.                          Step-1: We have to have knowledge about integer number.An integer number does not have any fractional part.It can be positive or negative number. Now you have to understand about consecutive integer number.The difference between two consecutive integer numbers    is always 1.                    Step-2: Say,the first integer number is x. So, the second integer number will be x+ 1. Thus, the third consecutive integer number will be x+2  .Besides,the fourth integer number will be x+3. Have a look here. The fo...

      The sum of 4 consecutive integers is 180. What is the largest number in the group? Solution: We need to find out the  largest  number    from    consecutive integer numbers' sequence.                          Step-1: We have to have knowledge about integer number.An integer number does not have any fractional part.It can be positive or negative number. Now you have to understand about consecutive integer number.The difference between two consecutive integer numbers    is always 1.                    Step-2: Say,the first integer number is x. So, the second integer number will be x+ 1. Thus, the third consecutive integer number will be x+2  .Besides,the fourth integer number will be x+3. Have a look here. T...

      The sum of 4 consecutive integers is 180. What is the fourth number in this sequence? Solution: We need to find out the  fourth  number    from    consecutive integer numbers' sequence.                          Step-1: We have to have knowledge about integer number.An integer number does not have any fractional part.It can be positive or negative number. Now you have to understand about consecutive integer number.The difference between two consecutive integer numbers    is always 1.                    Step-2: Say,the first integer number is x. So, the second integer number will be x+ 1. Thus, the third consecutive integer number will be x+2  .Besides,the fourth integer number will be x+3. Have a look here....

     The sum of 4 consecutive integers is 198. What is the fourth number in this sequence? Solution: We need to find out the  foueth  number    from    consecutive integer numbers' sequence.                          Step-1: We have to have knowledge about integer number.An integer number does not have any fractional part.It can be positive or negative number. Now you have to understand about consecutive integer number.The difference between two consecutive integer numbers    is always 1.                    Step-2: Say,the first integer number is x. So, the second integer number will be x+ 1. Thus, the third consecutive integer number will be x+2  .Besides,the fourth integer number will be x+3. Have a look here. ...

    The sum of 4 consecutive integers is 326. What is the second number in this sequence? Solution: We need to find out the  second  number    from    consecutive integer numbers' sequence.                          Step-1: We have to have knowledge about integer number.An integer number does not have any fractional part.It can be positive or negative number. Now you have to understand about consecutive integer number.The difference between two consecutive integer numbers    is always 1.                    Step-2: Say,the first integer number is x. So, the second integer number will be x+ 1. Thus, the third consecutive integer number will be x+2  .Besides,the fourth integer number will be x+3. Have a look here. The fo...

The sum of 4 consecutive odd numbers is 40 . What is the second number in this sequence ? Solution: We need to find out the  second odd number    from    consecutive odd number sequence.                          Step-1: We have to have knowledge about odd number . If you divide a odd number by 2 ,you will get a remainder.,i.e. an odd number is not exactly divisible by 2. Now you have to understand about consecutive odd number.The difference between two consecutive odd number    is always 2.                    Step-2: Say,the first odd number is x. So, the second odd number will be x+ 2. Thus, the third consecutive odd number will be x+4  .Besides,the fourth odd number will be x+6. Have a look here. The four consecutive odd numbers are x, x+2,x+4 ,x+6 ...

    The sum of 5 consecutive odd numbers is 135 . What is the second number in this sequence. Solution: We need to find out the  third odd number    from    consecutive odd number sequence.                          Step-1: We have to have knowledge about odd number . If you divide a odd number by 2 ,you will get a remainder.,i.e. an odd number is not exactly divisible by 2. Now you have to understand about consecutive odd number.The difference between two consecutive odd number    is always 2.                    Step-2: Say,the first odd number is x. So, the second odd number will be x+ 2. Thus, the third consecutive odd number will be x+4  .Besides,the fourth odd number will be x+6.Furthermore,the fifth odd number will be x+8. Have a look h...

   The sum of 3 consecutive odd numbers is 183 .What is the second number in this sequence ? Solution: We need to find out the  third odd number    from    consecutive odd number sequence.                          Step-1: We have to have knowledge about odd number . If you divide a odd number by 2 ,you will get a remainder.,i.e. an odd number is not exactly divisible by 2. Now you have to understand about consecutive odd number.The difference between two consecutive odf number    is always 2.                      Step-2: Say,the first odd number is x. So, the second odd number will be x+ 2. Thus, the third consecutive odd number will be x+4  . Have a look here. The three consecutive odd numbers are x, x+2,x+4 ,respectively.   ...

  The sum of 3 consecutive odd numbers is 69 .What is the third number in this sequence ? Solution: We need to find out the  third odd number    from    consecutive odd number sequence.                          Step-1: We have to have knowledge about odd number . If you divide a odd number by 2 ,you will get a remainder.,i.e. an odd number is not exactly divisible by 2. Now you have to understand about consecutive odd number.The difference between two consecutive odf number    is always 2.                      Step-2: Say,the first odd number is x. So, the second odd number will be x+ 2. Thus, the third consecutive odd number will be x+4  . Have a look here. The three consecutive odd numbers are x, x+2,x+4 ,respectively.      ...

   The sum of 5 consecutive even numbers is 200. What is the fifth number in this sequence?   Solution: We need to find out the third number    from    consecutive even number sequence.                          Step-1: We have to have knowledge about even number . If you divide a even number by 2 ,you will get a remainder of 0. Now you have to understand about consecutive even number.The difference between two consecutive even number    is always 2.                      Step-2: Say,the first even number is x. So ,the second even number will be x+ 2. Thus, the third , fourth and fifth consecutive even number will be x+4  ,  x +6 and x+ 8 respectively. Have a look here. The five consecutive even numbers are x, x+2,x+4 , x+6 and x +8...

   The sum of 5 consecutive even numbers is 100. What is the first number in this sequence?   Solution: We need to find out the third number    from    consecutive even number sequence.                          Step-1: We have to have knowledge about even number . If you divide a even number by 2 ,you will get a remainder of 0. Now you have to understand about consecutive even number.The difference between two consecutive even number    is always 2.                      Step-2: Say,the first even number is x. So ,the second even number will be x+ 2. Thus, the third , fourth and fifth consecutive even number will be x+4  ,  x +6 and x+ 8 respectively. Have a look here. The five consecutive even numbers are x, x+2,x+4 , x+6 and x +8...

  The sum of 3 consecutive even numbers is 132 . What is the small number in this sequence ? Solution: We need to find out the  third even number    from    consecutive even number sequence.                          Step-1: We have to have knowledge about even number . If you divide a even number by 2 ,you will get a remainder of 0. Now you have to understand about consecutive even number.The difference between two consecutive even number    is always 2.                      Step-2: Say,the first even number is x. So, the second even number will be x+ 2. Thus, the third consecutive even number will be x+4  . Have a look here. The three consecutive even numbers are x, x+2,x+4 ,respectively.          ...