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3 years ago

what are three of Rutherford’s major achievements that helped earn him the title “Father of Nuclear Physics.”

Chemistry

1 answer:

RoseWind [281]3 years ago

4 0

Discovered the necleus
proposed the proton existence
discovered fusion reaction from fission

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Among the different types of scientific knowledge ______ are likely to be modified or discarded most frequently. Long ago, in th

Tresset [83]

During a scientific study a hypotheses is generally modified or discarded

so for first blank the answer is hypotheses

Now in case of phlogiston theory it was assumed that when a substance catches fire it evolve certain substances known as phlogiston which was later on discarded as there is no such particle. Infact a substane undergoing oxidation may gain weight

Hence in second blank the answer is new evidence didn’t support it,

4 0

3 years ago

Predict the molecular geometry about N in the molecule CH3NHCH3

andre [41]

The correct answer is D

7 0

3 years ago

It is found that 250 ml of gas at stp has a mass of .675 g what is the molar mass

katrin2010 [14]

Answer:

61.3 g/mol

Step-by-step explanation:

We can use the Ideal Gas Law to solve this problem:

pV = nRT

Since n = m/M, the equation becomes

pV = (m/M)RT Multiply each side by M

pVM = RT Divide each side by RT

M = (mRT)/(pV)

Data:

m = 0.675 g

R = 0.0.083 14 bar·L·K⁻¹mol⁻¹

T = 0 °C = 273.15 K

p = 1 bar

V = 250 mL = 0.250 L

Calculation: 

M= (0.675 × 0.083 14 × 273.15)/(1 × 0.250)

M= 15.33/0.250

M= 61.3 g/mol

4 0

3 years ago

How do molecules move to the location of the chemical change

Svetach [21]

In a chemical change, the molecules in the reactants interact to form new substances. In a physical change, like a state change or dissolving, no new substance is formed.

hope this helped

4 0

3 years ago

Calcule la masa en gramos de cloruro de hidrógeno (HCl) que se forma cuando 5.6 L de hidrógeno molecular, medido a TPE, reaccion

AveGali [126]

Calculate the mass in grams of hydrogen chloride (HCl) that is formed when 5.6 L of molecular hydrogen, measured at TPE, reacts with an excess of gaseous molecular chlorine. MHCl = 36.5 g/mol

H2(g) + Cl2(g) → 2HCl(g)

Answer:

18.25g

Explanation:

The reaction equation is given as;

H₂ + Cl₂ → 2HCl

Given parameters:

Volume of hydrogen gas = 5.6L

The reaction occurs at STP.

Solution:

To solve this problem, let us find the number of moles of the hydrogen as;

At STP;

22.4L of a gas has 1 mole;

5.6L of Hydrogen as will have $\frac{5.6}{22.4}$ = 0.25mole

From the balanced reaction equation;

1 mole of H₂ will produce 2 mole of HCl

0.25 mole of H₂ will produce 2 x 0.25 = 0.5mole of HCl

The mass of HCl';

Mass of HCl = number of moles x molar mass

Mass of HCl = 0.5 x 36.5 = 18.25g

7 0

3 years ago