Can some one please help

Answers

Answer 1

Answer:

Chadwick-he discovered the neutron. He discovered this by demonstrating a neutral particle with a mass the same as a proton through a reaction between gramma Ray's and a wax sample.

Rutherford-he discovered the concept of radioactive half-life, the radioactive element radon, and named alpha and beta radiation.

j.j.Thompson discovered that atoms where made up of smaller components. This had major effects for the field of physics.

Related Questions

1/10 = square root of x

Answers

Answer:

x = 1/100 = 0.01

Explanation:

1/10 = √x

(1/10)² = (√x)²

1/100 = x

or x = 0.01

When the temperature goes up, the volume will also go up
What is the possible reason?
Mention one real-world example?

Answers

Answer:

Yes it will

An example is ice, when it melts the volume goes up which means it occupies much more space

What is the mass of an unknown object that has a volume of 20 mL and density of 3.5 g/mL?

Answers

Answer:

Explanation:

density=mass/volume

therefore mass = density*volume

20*3.5=70

What is the mass of a sample containing 3.5 moles of silicon atoms?
28 g
72g
98 g
35 g

Answers

The answer is c .”98 g “

Calculate the volume, in liters, occupied by 0.960 mol of oxygen gas at STP.

Answers

Answer:

21.504 liters

Explanation:

Given: 0.960 mol

Volume: ?

Molar Volume at STP = 22.4 liters

0.960 mol × 22.4 L/ 1 mol =

0.960 × 22.4 L = 21.504 L

How do you solve that with fractions

Answers

Answer:

bacon

Explanation:

nator

Answer:

1.57

Explanation:

nator

1. What is the density of a strip of magnesium that occupies a volume of 8.49 mL and weighs
33.7 g.
I

Answers

Answer:

The answer is 3.97 g/mL

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass of metal = 33.7 g

volume = 8.49 mL

So we have

[tex]density = \frac{33.7}{8.49} \\ = 3.969375736...[/tex]

We have the final answer as

3.97 g/mL

Hope this helps you

a particle moves through gas at a speed of 1.5 km/m. How long will it take for the particle to go a distance of 158 m

Answers

Answer:

Particle take 0.11 min to travel 158 m distance.

Explanation:

Given data:

Speed of particle = 1.5 Km/m

Distance to cover = 158 m (158/1000 = 0.158 Km)

Time taken = ?

Solution:

Formula:

s = d/t

s = speed

d = distance

t = time

Now we will put the values in formula.

1.5 Km/m = 0.158 Km / t

t = 0.158 Km /1.5 Km/m

t = 0.11 min

Thus, particle take 0.11 min to travel 158 m distance.

Good scientists have what characteristics in common?

Answers

Answer:

determination or brains

Explanation:

6. The concentration of a solution is : a)The amount of solvent needed to fully dissolve a solute b)The measurement of how large a mixture can get before it becomes a solution c)The measurement of how much solute can be dissolved in a liter of solvent d)The proportion of solute to solvent in a mixture

Answers

Answer:

Option c) The measurement of how much solute can be dissolved in a liter of solvent.

Explanation:

The concentration of a solution can be defined as the amount of solute in 1 litre of the solvent i.e how much of the solute that can dissolve in a litre of the solvent. Mathematically, it can be written as:

Concentration = mole of solute / Volume of solvent

Thus, the unit for the concentration is mole per litre (mol/L)

From the above illustration, we thus say that the concentration of a solution is a measure of how much solute can be dissolved in a liter of solvent.

Answer: A) Increase the amount of solute.

C) Decrease the amount of solvent.

What is the correct order for.the three steps of the scientific method ?

Answers

The basic 3 steps are: 1) make an observation that describes a problem 2) create a/an hypothesis 3) test the hypothesis and 4) draw conclusions and refine the hypothesis

A geologist drew a diagram illustrating a section of a boundary between two
tectonic plates. His diagram includes the geologic feature shown below.

Answers

Answer:

pls complete your question

Which of the following is an example of chemical weathering?

A. Splitting of rick due to expansion of water

B. Shrinkage of rock when the water is evaporated

C. Erosion due to wind-blown sand

D. Cave formation from the acid in water dissolving limestone

Answers

Answer:

Explanation:

disolving is a chemical like word and if a limestone cave is forming from the acid in the water thats chemical wheathering!

Answer:

Cave formation from the acid in water dissolving limestone

Explanation:

help me with this question please

Answers

Covalent bonds do not display luster; therefore, the answer to the question would be the third bullet, luster.

how should i read chemistry ?

Answers

Answer:

CHEMIcal hiSToRY

Explanation:

3. If Dr. Birdley is packing a if Dr.Birdley is packing a snowball, which of
the following properties is likely to increase?
a) mass
b) volume
c) density
d) weight

Answers

Answer:

c. density

hope this helps :)

Explanation:

You are feeling ill, you go to the doctor, explain how he would use the scientific method to determine what is wrong with you

Answers

The doctor would form a hypothesis based on your symptoms. If you have a cough for instance, then s/he could hypothesize that you have a cold or flu. From that hypothesis, they would gather data in the form of measuring your vitals and so on. Using that data, they would be able to confirm the hypothesis, or reject it in form of some alternative.

What is this mixture made up from? Please answer correctly !!!!!!!!!!!!! Will mark Brianliest !!!!!!!!!!!!!!!!!

Answers

The caption of the image says the solution is a mixture of water and copper chloride.

A solution is just a specific type of mixture, in particular it is a homogeneous mixture in liquid form.

Hope that helped!

Read the description of how ancient metalworkers improved their iron. Then identify the solute and solvent by filling in the blanks.

In steel, the solvent is
and the solute is
.

Answers

Answer:iron and carbon

Explanation:I took the test it’s iron and carbon

Answer:

iron and carbon

Explanation:

did the assignment on edg lmk if u need help on the assignment

Why are ions formed?

Answers

Answer:

Ions are formed when atoms lose or gain electrons in order to fulfill the octet rule and have full outer valence electron shells.

Explanation:

When they lose electrons, they become positively charged and are named cations. When they gain electrons, they are negatively charged and are named anions.

Which statement about exothermic reactions is true?
The reaction container always feels cold.
The reactants have more heat energy than the products.
O Energy from an outside source is continuously being added.
More heat is given off than is put into the reaction.

Answers

Answer:

The reactants have more heat energy than the products.

Explanation:

The reactants in an exothermic reaction have higher potential heat energy than the products, this is because they release the energy as heat.

Answer:

just took test is the reactants have more heat

Explanation:

How many ATOMS of sulfur are present in 3.07 grams of sulfur hexafluoride ?

Answers

Sulfur tetra flouride formula is SF4 so there are 3.07 moles of sulfur ATOMS in there.

Define what chemical and radiant energy is

Answers

Radiant energy is energy contained in electromagnetic waves. These include visible light, infrared, radio waves, ultraviolet and microwaves. ... Chemical energy is energy stored in chemical bonds between atoms.

Photosynthesis is the transformation of radiant energy to chemical energy. Plants take in water, carbon dioxide, and sunlight and turn them into glucose and oxygen. Called photosynthesis, one of the results of this process is that carbon dioxide is removed from the air.

1
Which of the following parts of Dalton's Atomic Theory IS supported by
Thomson's and Rutherford's model?
Everything is made of atoms
Electrons are larger than atoms
Atoms are indivisible
Atoms take the form of a solid sphere

Answers

Answerfirst one

Explanation:

can someone help and lmk if my answers are correct i don’t think they are please help i’ll give brainliest thank you

Answers

Answer:

5=C, every action has an equal or opposite reaction,

6=B, since it has less air drag and more force exerted on it

7= You're correct

write down the group numbers for carbon,oxygen,nitrogen and sulphur

Answers

Answer:

Carbon - 14

Oxygen - 16

Nitrogen - 15

Sulphur - 16

Explanation:

The question above is related to the "Periodic Table of Elements" which shows the proper arrangement of elements in a table. Every element falls on a group/family within the table. Each group has its own number, and the table has a total of 18 groups (from left to right). They are classified according to similarities in their characteristics. For example, group 1 is composed of alkali metals while group 2 is composed of alkali earth metals.

Where is most of the mass of an atom located? O it is split between the nucleus and the orbits Oin the electrons Oin the nucleus Oin the orbits

Answers

Answer:

In the nucleus.

Explanation:

Which statement best describes the role of the nervous system? *
5 points
collects waste produced by cells and removes it from the body
O it breaks down food, absorbs nutrients, and gets rid of solid waste
O
the network of nerve cells and fibers that transmits nerve impulses between parts of
the body
O
brings oxygen into the lungs and releases carbon dioxide and water (waste materials)
from the body.

Answers

Answer:

The network of nerve cells and fibres that transmits nerve impulses between parts of the body.

Answer:

THE STATEMENT WHICH BEST FITS THE NERVOUS SYSTEM IS:THE NETWORK OF NERVE CELLS AND FIBRES THE TRANSMITS NERVES IMPULSES BETWEEN PARTS OF THE BODY.

How many moles of Magnesium are present in 0.478 g of the element?
(Atomic mass: Mg-24 u)

Answers

Answer:

0.0199moles

Explanation:

The number of miles of a substance can be calculated using the formula:

Number of moles (n) = Mass (M) / Molar mass (MM)

In this question, the mass of Magnesium element (Mg) = 0.478 g while the atomic mass is 24

Therefore, number of moles of Magnesium is:

Moles = 0.478/24

Moles = 0.01992

Hence, 0.0199 moles of Magnesium are contained in 0.478 g of the element.

calculate the mass of onygen gas whose
volume is 320mL at 17 degree celsius and 2 atm Pressure

Answers

Answer:

The mass of oxygen gas is 0.96 g.

Explanation:

Given data:

Mass of oxygen gas = ?

Volume of as = 320 mL (320mL × 1L /1000 mL = 0.32 L)

Temperature of gas = 17 °C

Pressure of gas = 2 atm

Solution:

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K

T = temperature in kelvin

Now we will convert the temperature.

17+273 = 290 K

Now we will put the values in formula.

2 atm × 0.32 L = n × 0.0821 atm.L/ mol.K × 290 K

0.64 atm.L = n × 23.81 atm.L/ mol.

n = 0.64 atm.L / 23.81 atm.L/ mol.

n = 0.03 mol

Mass of oxygen:

Mass = number of moles × molar mass

Mass = 0.03 mol × 32 g/mol

Mass = 0.96 g

The mass of oxygen gas is 0.96 g.

The mass of oxygen will be "0.96 g".

Given:

Volume,

V = 320 mL

or,

= 0.32 L

Temperature,

T = 17°C

or,

= 290 K

Pressure,

P = 2 atm

General gas constant,

R = 0.821 atm.L/mol.K

As we know the formula,

→ [tex]PV = nRT[/tex]

By substituting the values, we get

[tex]2\times 0.32=n\times 0.0821\times 290[/tex]

[tex]0.64=n\times 23.81[/tex]

[tex]n = \frac{0.64}{23.81}[/tex]

[tex]= 0.03 \ mol[/tex]

hence,

→ Mass of oxygen = [tex]Number \ of \ moles\times Molar \ mass[/tex]

= [tex]0.03\times 32[/tex]

= [tex]0.96 \ g[/tex]

Thus the above answer is right.

Learn more:

https://brainly.com/question/14049502

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