As the temperature increases from 0°C to 25°C the amount of NH3 that can be dissolved in 100 grams of water.

Francium is the most reactive element in Group 1.

natali 33 [55]

Answer:

Francium is hypothesized to be the most reactive metal, but so little of it exists or can be synthesized, and the longest half-life of its most abundant isotope is 22.00 minutes, so that its reactivity cannot be determined experimentally.

Explanation:

Francium is an alkali metal in group 1/IA. All alkali metals have one valence electron. As you go down the group, the number of electron energy levels increases – lithium has two, sodium has three, etc..., as indicated by the period number. The result is that the outermost electron gets further from the nucleus. The attraction from the positive nucleus to the negative electron is less. This makes it easier to remove the electron and makes the atom more reactive.

Experimentally speaking, cesium (caesium) is the most reactive metal.

6 0

3 years ago

Read 2 more answers

Warm and cold air come together and neither air mass moves what kind of front is that

Marrrta [24]

Answer:

Stationary front

Explanation:

Stationary means they wont move ink but yeah thats the answer

3 0

3 years ago

At high temperatures phosphine (PH_3) dissociates into phosphorus and hydrogen by the following reaction: 4PH3 rightarrow P_4 +

Alex_Xolod [135]

Answer:a)p4=0.75mol

H2=4.5mol

B)PH3=1×10^7mole

P4=0.25×10^7mole

H2=1.5×10^7mole

Time taken for 3mol of phosphine to react is 54 ×10^7s

Explanation:From the balanced chemical equation

4PH3____P4+6H2

From Gay lussac law ,when gases combines

,They do so in a ratio which bear a simple ratio with their products,if gases.

So it means from the equation above

4 mol of PH3 will form 1mol of P4 and 6 mol of H2

Meaning that if 4mol of PH3 gives 1mol of P4

Then 3mol of PH3 will give 1/4 mol or 0.75 mol of P4 .

In the same vein,3mol of PH3 will give 6×3/4 mol of H2= 4.5 Mol of H2

B) molar concentration =mole/volume

Meaning mole=molar concentration ×volume

Molar concentration is given as 5Km/m^3=5000mol/m^3

Volume=2L =2×1000=2000m^3

Nos of moles=5000×2000=10^7moles

So for P4,nos of moles =1/4×10^7=0.25×10^7

ForH2 ,6/4 ×10^7=1.5×10^7 moles

Rate= volume/time

Time taken for reaction will be volume/rate=2000/3.715×10^6

=54×10^7s

5 0

2 years ago

What is the affected variable in an experiment. A:independent. B:dependent. C:control

Semmy [17]

In a controlled experiment, an independent variable (the cause) is systematically manipulated and the dependent variable (the effect) is measured; any extraneous variables are controlled. The researcher can operationalize (i.e. define) the variables being studied so they can be objectivity measured.

IamSugarBee

6 0

2 years ago

Given a stock solution of 0.128 m bromide, solve for the bromide concentration obtained by diluting a 450 µl aliquot to the mark

Vikki [24]

Hey there!

Stock solution:

Concentracion bromide = 0.128 M

initial solution in volumetric flask = 450 µl

So , moles of bromide present:

450 µl in liters :

1 µl = = 1*10⁻⁶ liters

450 * ( 1*10⁻⁶ ) = 0.00045

0.128 * 0.00045 => 57.6 * 10⁻⁶ moles

Now volume final is 25 mL , in liters : 0.025 L ou 25*10⁻³

so new bromide concentration:

57.6*10⁻⁶ / 25*10⁻³=> 2.304*10⁻³ M

4 0

3 years ago