What is the best description of what Becquerel observed in his experiment?

Answers

Answer 1

Answer: He is best known for his discovery of radioactivity, first reported just over a century ago in the selection reproduced here. The discovery of radioactivity thus represents a key development in the modern understanding of the atom. Hope this helps. Have a nice day.

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Which of the following is not a type of basic structure for a pure metal?

Answers

Okay well we do not have the attachment

A solution with a pH of 2.0 has a hydronium ion concentration ten times greater than a solution with a pH of(1) 1.0 (3) 3.0
(2) 0.20 (4) 20.

Answers

Answer:The correct answer is (3).

Explanation:

The pH of the solution is defined as negative logarithm of $H^+$ or hydronium ions ions in the solution.

$pH=-\log[H^+]$

$2=-\log[H^+]$

$[H^+]=0.01 M$

The pH with 10 times the concentration $H^+$ ions.

$[H^+]=10* [H^+]'$

$pH=-\log[H^+]'=-\log[(0.01)/(10)]=3$

Hence, the correct answer is (3).

The answer is (3) 3.0. The solution with a pH of 2.0 has greater concentration means the other solution has greater pH. pH=-lg[H+]. So we can get the pH of other solution is 3.

What measurements must you make to find the density of a sample of matter

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you would have to look for the mass of the sample and the volume of the sample.

Is aluminium malleable or rigid?

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Aluminum is malleabe

The heat of combustion of propane, C3H8, is 2220 kJ/mol. The specific heat of copper is 0.385 J/g°C. How many grams of propane must be burned to raise the temperature of a 10.0 kg block of copper from 25.0°C to 65.0°C, assuming none of the heat is lost to the surroundings?

Answers

The heat of combustion ( $\Delta$ Hc0) is the amount of energy released as heat when a compound completely burns with oxygen under standard conditions.

3.05988g. grams of propane must be burned to raise the temperature of a 10.0 kg block of copper from 25.0°C to 65.0°C.

What is meant by heat of combustion?

The heat of combustion ( $\Delta$ Hc0) is the amount of energy released as heat when a compound completely burns with oxygen under standard conditions. In most cases, a hydrocarbon reacts with oxygen to produce carbon dioxide, water, and heat.
The heat of combustion of a substance is the amount of energy released when a specific amount (e.g., 1 mol, 1g, 1 L) of the substance completely burns in oxygen. The heat of combustion is typically measured at 298K (25 C) and 101.3kPa.
The energy released when a substance X completely burns with an excess of oxygen under standard conditions (25°C and 1 bar). It is the inverse of the enthalpy change for the combustion reaction in thermodynamic terms.

q=m*c*(change of T)

q=10000g(0.385J/g*c)*(65.0C-25.0C)or (338.2 K-298.2K)

q=154000J

154000J*(1 mol/2220 KJ)=69.36936 x $10 ^-3$ mol

here's where I'm stuck

0.069369 mol

and i know that for every 1 mol there is 44.11g of C3H8.

0.069369 mol* (44.11g C3H8)/1mol = 3.05988g.

To learn more about : Heat of combustion

Ref : brainly.com/question/25109613

#SPJ2

Answer:

Explanation:

q = (mass) (temp change) (specific heat)

q = (10000 g) (40 °C) (0.385 J/g⋅°C) = 154000 J = 154 kJ

154 kJ / 2220 kJ/mol = 0.069369369 mol

0.069369369 mol times 44.0962 g/mol = 3.06 g (to three sig figs)

answer choice 4

If a shell can hold a maximum of 32 electrons, what is the value of n?

Answers

In my textbook it says that the maximum number of electrons that can fit in any given shell is given by 2n². Which would mean 2 electrons could fit in the first shell, 8 could fit in the second shell, 18 in the third shell, and 32 in the fourth shell. However, I was previously taught that the maximum number of electrons in the first orbit is 2, 8 in the second orbit, 8 in the third shell, 18 in the fourth orbit, 18 in the fifth orbit, 32 in the sixth orbit. I am fairly sure that orbits and shells are the same thing.

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