CHEMISTRY HIGH SCHOOL

Add 92.2 km to 9426 m and report the answer inkm.
92.2 km + 9426 m =
km
Help me plz

Answers

Answer 1

Answer:

Answer:101.6

Explanation:

Answer 2

Answer:

to convert m into km we have to divide it by 1000.so,

9426/1000=9.426km

92.2km+9.426km=101.626km.

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Need a correct answer fastHow many moles of solute are contained in a 500.0 milliliter solution that has a concentration of 0.35 M?

17. How many moles are there in a sample containing 1000 molecules of H2O?18. If you wanted a sample of H2O containing 6 x 23molecules, how could you measapproximate number without counting?

Answers

17) mol of $H_(2)O$ = $(no. of molecule)/(L)$
= $(1000 molecules)/(6.03 * 10^(23) molecules/mol )$
= 1.658 *    $10^(-21) mol$

18) mol = $(molecule)/(L)$
   $(Mass)/(Mr) = (Molecule)/(L)$
Let mass of oxygen = x
   $(x)/((2 * 1) + (16)) = (6 * 10^(23) )/(6.03 * 10^(23) )$
$x = (6 * 10^(23) ) (18 g/ mol)$
= 17.9 g

Calculate the number of moles 3.16 g of KMnO4 32.33 g of K2CrO4 100 g of KHCO3

Answers

The number of moles:
3.16g of $KMnO_(4)$
1 mole of $KMnO_(4)$ - 158g.
x moles of $KMnO_(4)$ - 3.16g.
$x=(1\ mole*3.16g)/(158g)=(3.16)/(158)=0.02\ mole$

The number of moles:
32.33g of $K_(2)CrO_(4)$
1 mole of $K_(2)CrO_(4)$ - 194g.
x moles of $K_(2)CrO_(4)$ - 32.33g.
$x=(1\ mole*32.33g)/(194g)=(32.33)/(194)=0.17\ mole$

The number of moles:
100g of $KHCO_(3)$
1 mole of $KHCO_(3)$ - 100.1g.
x moles of $KHCO_(3)$ - 100g.
$x=(1\ mole*100g)/(100.1g)=(100)/(100.1)=0.999\ mole$

Greetings,
n00nst00p :)

To form a solution, ________. A. substance must dissolve in another
B. a solid must dissolve in a liquid
C. the solvent must be water
D. a gas must dissolve in a liquid

Answers

To form a solution, a substance must dissolve in another. The correct answer will be A.

Answer:

1.A

2.A

3.A

4.A

100% RIGHT

Explanation:

The scientific notation 2 x 10-2 has what value?
0.02
0.002
0.2
0.0002

Answers

Answer : The correct option is, 0.02

Explanation :

The scientific notation is a way of the representation of the very small or very large number.

The given scientific notation is, $2* 10^(-2)$

That means,

$2* 10^(-2)=(2)/(100)=0.02$

Hence, the scientific notation of $2* 10^(-2)$ has 0.02 value.

Since the exponent is negative, you move the decimal (2.0) to the left two spots leaving you with .02

What do the numbers listed for an element on the periodic table represent? The number with a higher value is the number of protons, and the number with a lower value is the number of neutrons.

The number with a higher value is the number of electrons, and the number with a lower value is the number of protons.

The number with a higher value is the mass, and the number with a lower value is the number of protons.

The number with a higher value is the number of protons, and the number with a lower value is the mass.

Answers

The answer is The number with a higher value is the mass, and the number with a lower value is the number of protons.

The number with a higher value is the mass. This is because the mass number of the element is the sum of the number of protons and number of neutrons in the nucleus of the atom. On the other hand, the number with a lower value is the number of protons. The number of proton in the nucleus of the atom is the atomic number of the element. It involves only numbers of protons, thus, it has the lower value than the mass number.
For example, hydrogen has 1 proton and 1 neutron. Its atomic number is 1 (= number of protons). Its mass number is 2 (1 proton + 1 neutron = 2). Thus, mass number has higher value than the atomic number.

This malleable metal has an atomic number of 79