Which of the following answer choices best describes J. J. Thomson's plum-pudding model?An atom is surrounded by a firm outer shell and contains positively charged particles in its core.An atom is surrounded by a firm outer shell and contains negatively charged particles in its core.An atom consists of positively charged matter that contains negatively charged particles.An atom consists of negatively charged matter that contains positively charged particles.

Answers

Answer 1

Answer:

The statement that best describes J. J. Thomson's plum-pudding model is; an atom consists of positively charged matter that contains negatively charged particles.

The model of J. J. Thomson looked at the atom merely as a ball of positive charges into which negative charges were embedded.

This model was propounded by J. J. Thomson in the year 1897. This model began the journey into empirical observation of the structure of the atom.

Thompson further carried out his experiments using a cathode ray tube and propounded the model shown in the image attached to this answer.

Learn more: brainly.com/question/2437167

Answer 2

Answer:

Answer:

An atom consists of positively charged matter that contains negatively charged particles.

Explanation:

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A well-tested explanation that explains a lot of observations isA. a hypothesis.
B. an inference.
C. a theory.
D. a controlled experiment.

Answers

A: Because a hypothesis is a educated guess

A well-tested explanation that explains a lot of observations is a theory.

Will rate 5 stars! Please help!

Answers

i have no idea.. im not in chemistry yet.. but i think the first one is D

How can there be more than 1000 different atoms when there are only about 100 different elements?

Answers

Actually, there are only about 100 atoms that have been yet discovered. But each element has many different kinds of atom. For instance, carbon. Do you know carbon has more than 30 or 50 different types of atoms? Well, how? There are isotopes. Don't think that there is only one carbon atom which has 6 electrons and 6 protons and 6 neutrons. There are more. C-13 has 6 electrons and 6 protons and 7 neutrons. While, C-14 has 6 electrons and 6 protons and 8 neutrons. I just showed you three stable isotopes of carbon(element). But, what is really an isotope?? Did you notice that all of these atoms had the same number of protons and electron but different numbers of neutrons? This is really an isotope. Well, if an atom takes a few more electrons or gives off a few electrons, it still stays the same element/ atom type. Just like that an element can have atoms of different neutron number. It may be less or more. It doesn't affect the atom much: just makes an isotope. But it does affect the atomic mass number or radioactivity of an atom. So, an element can have many different forms of isotopes of its atoms. In this way, being only 100 atoms, there can 1000 atoms or (more than that!).

To make it more clear-

Definition of ISOTOPE: any of two or more forms of a chemical element, having the same number of protons and electrons in the nucleus, or the same atomic number, but having different numbers of neutrons

HOPE YOU UNDERSTOOD THE MATTER:-))

There can be more atoms because atoms make about everything and those atoms make up the elements and since,atoms are in everything there can be different kinds of atoms to make up certain things.

A copper penny has a mass of 6.2 grams and a volume of 0.70ml. What is the density of the penny

Answers

Given:
A copper penny has a mass of 6.2 grams and a volume of 0.70ml

Required:
density of the penny

Solution:
D = M/V where D is teh density, M is the mass and V is the volume

D = 6.2 grams/0.70 mL
D = 8.9 grams per milliliters

What is the freezing point of an aqueous solution that boils at 105.0 ∘C? Express your answer using two significant figures.

Answers

The boiling point of standard water is 100 degree Celsius, with the addition of solute the boiling point is elevated. The freezing point of the solution will be -18.04 degree Celsius.

What is boiling point?

The boiling point is the temperature at which the liquid is converted to vapor. The change in boiling point of the aqueous solution gives the molality of the solution as:

$\rm \Delta T=ebuliloscopic constant\;*\;molality\;*\;von't\;hoff\;factor\n105^\circ C-100^\circ C=0.512^\circ C.kg/mol\;*\;1\;*\;m\n9.7\;mol/kg=m$

The depression in freezing point from molality is given as;

$\rm \Delta T=K_f\;*\;molality\;*\;i\n\Delta\;T=1.86\;^\circ C/m\;*\;9.7\;*\;1\n\Delta T=18.04\;^\circ C\n$

The freezing point of aqueous water is zero degree Celsius. The freezing point of the solution will be:

$\rm \Delta T=0^\circ\;C-New\;freezing\;point\n18.04^\circ\;C=0-New\;freezing\;point\nNew\;freezing\;point=-18.04^\circ C$

The freezing point of the solution is -18.04 degree Celsius.

Learn more about boiling point, here:

brainly.com/question/2153588

Answer:

T°fussion of solution is -18°C

Explanation:

We have to involve two colligative properties to solve this. Let's imagine that the solute is non electrolytic, so i = 1

First of all, we apply boiling point elevation

ΔT = Kb . m . i

ΔT = Boiling T° of solution - Boiling T° of pure solvent

Kb = ebuliloscopic constant

105°C - 100° = 0.512 °C kg/mol . m . 1

5°C / 0.512 °C mol/kg = m

9.7 mol/kg = m

Now that we have the molality we can apply, the Freezing point depression.

ΔT = Kf . m . i

Kf = cryoscopic constant

0° - (T°fussion of solution) = 1.86 °C/m . 9.76 m . 1

- (1.86°C /m . 9.7 m) = T°fussion of solution

- 18°C = T°fussion of solution

A box experiences a force of 2 N to the left and 3 N to the right. Which is true of the box's motion?A) The box will slow down.
B) The box's velocity will be 1 m/s.
C) The box's velocity will not change.
D) The box will experience acceleration.

Answers

Answer: Option (D) is the correct answer.

Explanation:

The rate of change in velocity over change in time is defined as acceleration.

Mathematically, Acceleration = $(\Delta v)/(\Delta t)$

where $\Delta v$ = change in velocity

$\Delta t$ = change in time

Therefore, when a force of 2 N to the left and 3 N to the right then box will experience acceleration as velocity is also changing with time.

Thus, we can conclude that a box experiences a force of 2 N to the left and 3 N to the right then it is true that the box will experience acceleration.

Answer choice would be D, answer choice B, is the boxes net force. Velocity = distance/time. The correct answer is D. I hope this helps!

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