Answer: Atoms aren't entirely empty space
Explanation:
Rutherford did his scatter experiment to disprove Thomson's Plum Pudding Model. Rutherford shot helium nuclei at a sheet of gold and expected the particles to all go straight through to a sensor. The reason he expected this was because Thomson said that atoms are mostly made of empty space. Not all the particles went through the gold sheet, a lot of them actually reflected back to him. This meant that atoms aren't entirely empty space and something had to deflect the helium nuclei
A chemist forms 16.6 g of potassium iodide by combining 3.9 g of potassium with 12.7 g of iodine. Show that these results are consistent with the law of conservation of mass.
The law of conservation of mass states that mass can neither be created nor destroyed by chemical reactions or physical transformations.
The mass of potassium iodide can be calculated from the sum of the mass of potassium and iodine.
The mass of potassium iodide is as follows:-
[tex]Mass\ of \ potassium\ iodide=3.9\ g+12.7\ g\\=16.6\ g[/tex]
So, the total mass of potassium iodide is equal to the mass of potassium plus iodine. So, these results are consistent with the law of conservation of mass.
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Characteristics used to describe matter are you called
Physical properties are characteristics that describe matter. They include characteristics such as size, shape, color, and mass. These characteristics can be observed or measured without changing the identity of the matter in question.
Answer:
Physical properties
Explanation:
Which thing has the greatest
mass and volume?
• a very large rock
• a big balloon
• a mud puddle
• a car
Answer:
either a car or a rock
Explanation:
because the rock can weigh more than the car , and vice-versa with the car weighing more than the rock
Who would most likely be required to work with sodium hydroxide?
a plumber
a gardener
a bricklayer
a mechanic
Need answer ASAP
Sodium hydroxide NaOH is proven to be an active agent for improving the mechanical properties of the bricks. Hence, bricklayer most likely need sodium hydroxide.
What is sodium hydroxide?Sodium hydroxide is an ionic compound formed by the metallic sodium and water. Sodium hydroxide has the chemical formula NaOH. It is a strong base and used as a reagent in many chemical synthesis which has to be carried in presence of a base.
Sodium hydroxide has an effect on the drying kinetics of bricks which are made with clay. Studies reported that the drying duration is linearly related with the concentration of NaOH.
Drying duration of bricks layers increases with increase in concentration of NaOH as well as the material porosity decreases. and hence the bricks will not show the visible cracks. Therefore, bricklayer need NaOH.
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Answer:
A) a plumber
Explanation:
What is the smallest piece of an element?
O A. A speck
O B. A molecule
C. An atom
D. A crystal
Answer:
I think it's c (viewpoint)
..
Answer:
C. An atom
Explanation:
The smallest particle of any particular type of matter is known by which of the following terms?
Group of answer choices
Compound
Chemical
Element
Atom
What does the chemical formula Cach, show about the compound it represents?
O It is made up of one element,
It is made up of two elements,
It is made up of three elements,
It is made up of four elements,
Answer: It is made up of one element
Answer: it is made up of 2 elements.
Explanation:
Ca and Cl are each there own element.
5. (4 points) “She’s singing higher than he is” is a statement related to:___
A. Volume
B. Pitch
Answer:
It's pitch
Explanation:
I play violin and it would be the same. Pitch is how high a note is. A B in treble clef is higher than a G
An ion has an overall charge of -2. Its the nucleus is made up of 29 protons and 35 neutrons. How many electrons does the atom have?
Answer:
31 electrons.
Explanation:
Atoms initially have a neutral charge. So if this atom were neutral, it would have 29 electrons to balance out with the 29 protons. Protons are never added or removed. Since this atom has a -2 charge, that means it is an anion with 2 additional electrons. 29e- + 2e- = 31e-
A continental slope is the boundary between what to types of Earth's crust?
A Basalt and Sandstone
B Convergent and Divergent
C Continental and Oceanic
D Volcanic and Sedimentary
Answer:
c
Explanation:
I took the k12 test and got it right
A continental slope is a boundary between the Continental crust and Oceanic crust. Therefore, option (C) is correct.
What is a continental slope?A continental slope can be described as the slope between the outer edge of the continental shelf and the deep ocean floor. The continental slope is defined as a cut by submarine canyons in many locations and marks the seaward edge of the continental shelf.
Continental slopes follow the boundary between continental and oceanic crust. The Continental slope has a steepness range from 1 to 25 degrees, the average is 4 degrees.
The continental margin lies between the continental shelf and the abyssal plain and comprises a continental slope that is surrounded by the flatter continental rise. It contains thick sediments deposited by currents from the shelf and slope.
The shelf generally ends at a point of increasing slope known as the shelf break and the sea floor under the break is the continental slope.
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Which process changes matter from a gas to a liquid state?
Answer:
Condensation
Explanation:
Quick answer
Do cells in many-celled organisms all look the same or different? Explain.
Cells in many-celled organisms can look the same or different, depending on the type of organism and the function of the cells.
In general,multi-cellular(many-celled) organisms have specialized cells that perform specific functions, such as muscle cells, nerve cells, and blood cells. These cells are different in structure and function, but they all work together to maintain the organism's health and survival.
For example, in humans:
Muscle cells are long and cylindrical, while nerve cells are long and thin with many branches. Blood cells are smaller and come in several different types, such as red blood cells, which carry oxygen, and white blood cells, which fight infection.On the other hand, some cells in many-celled organisms look the same, such as skin cells, which are flat and thin, and line the surface of the skin.Therefore, cells in many-celled organisms can look the same or different, depending on the function of the cells. While many-celled organisms have specialized cells, some cells have the same structure and function.
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NEED HELP ASAP-WILL GIVE 15 POINTS
Which sentence below accurately demonstrates the process of osmosis?
A. Leaving a raw egg in water for a period of time will cause the egg to swell in size.
B. A plastic bag filled with salt water is left in a larger container of water over night and all of the water in the large container becomes salty.
C. A drop of food coloring in water will slowly disperse throughout the water molecules and eventually completely change the water's color.
D. When a bottle of perfume is opened, the smell is stronger at first and then it fades.
Answer:
a
Explanation:
its a
Which statement correctly describes the reactivity of noble gases, according to the octet rule?
Their atoms have one electron in their valence shells, so noble gases are very reactive.
Their atoms have eight electrons in their valence shells, so noble gases are very unreactive.
Their atoms have one electron in their valence shells, so noble gases are very unreactive.
Their atoms have eight electrons in their valence shells, so noble gases are very reactive.
I WILL GIVE YOU BRAINLIEST!!!
Answer:
The second option
Answer:
Intent to cause harm
I will give 25 points and make them brainlest if they solve this.
A carbon atom that is a part of your body could very well have been part of a dinosaur millions of years ago. What BEST explains this?
A The carbon atoms that are found in current living things are developed when the organism is produced.
B Carbon atoms found in current living things are the same carbon atoms that have always been a part of living things, they are just recycled.
C This could not be explained because carbon found in our bodies could not have a part of any previous organism.
D Carbon atoms are genetically passed through the evolution of organism.
Answer:
B - Carbon atoms found in current living things are the same carbon atoms that have always been a part of living things, they are just recycled.
Carbon atoms found in current living things are the same carbon atoms that have always been a part of living things, they are just recycled. Hence, option B is correct.
What is an atom?An atom is a particle of matter that uniquely defines a chemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons.
Dinosaurs were the most dominating organism in that time period.
The dinosaurs and the present-day human beings have certain similar characteristics. Some of them are as follows-
They both have control over their body movement.They have a well-functioning brain.They are sharp and active.The dinosaurs were dominant during the Jurassic period and the humans are dominating at the present on earth.Hence, option B is correct.
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What is Ammonium bisulfate as a chemical formula?
Answer:
Ammonium bisulfate/Formula
(NH4)HSO4
Reason to answer:
Mark me brainliest
i need some help all of this stuff is due soon
Answer:
A is one of them.
Is there more?
B and D if I'm not mistaken.
The lightning storm is just what you'd expect it to be, and the comb is collecting particles of what looks like paper?
Anyway, the rock and the magnet are forcefully pulling the metal objects towards it with electromagnetism.
PLZ HELP WILL GIVE U BRANILEIEST
Answer:
I'm pretty sure it is C
Explanation:
because it has the same number of protons and neutrons
A graduated cylinder is filled with 54.32 cm3 of water. An irregular solid made of iron is carefully placed into the graduated cylinder. The new volume recorded on the graduated cylinder is 57.65 cm3. The density of iron is known to be 7.874 g/cm³. What is the mass in grams of the irregular solid made of iron?
Answer:
The answer is 26.22 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
density of iron = 7.874 g/cm³
volume = final volume of water - initial volume of water
volume = 57.65 - 54.32 = 3.33 mL
We have
mass = 7.874 × 3.33 = 26.22042
We have the final answer as
26.22 gHope this helps you
How do you work out the charge of sulphate
Answer:
You would have find its valency
help me its due soon thanks
Answer:
B
Explanation:
The gravity accelleration values are the same for both planets.
B: Mercury and Mars have the same gravitational force.
You can see at the chart, it shows
Gravity: Mercury Mars
3.7 m/s2 3.7 m/2
Which statement best describes how an existing theory is often affected by the development of new technology?
A.) An existing theory is thrown out and replaced with a completely new theory based on the new observations.
B.)An existing theory is modified so that it can explain both the old and new observations.
C.)An existing theory remains the same because a theory is a proven fact that is always true.
D.)An existing theory is kept unchanged while a new theory is developed to explain the new observations.
Answer:
An existing theory is modified so that it can explain both the old and new observations.
Explanation:
The statement which best describes how an existing theory is often affected by the development of new technology is that an existing theory is modified so that it can explain both the old and new observations.
What is a theory?
Theory is defined as a thoughtful explanation which is provided for observations which is constructed using scientific methods.The theory brings together many facts and hypothesis.
It is called as theory as it provides some set of assumptions initially which provide description to the field's approach to the subject.These are elementary theorems of a particular theory.It is a rational type of thinking about a set of observations.
They may be scientific,or non scientific or have no discipline at all.There are three types of theory:1) scientific, 2)philosophical and 3) moral.It provides explanation regarding the underlying mechanisms .
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If an element gives away an electron, will it form a positive ion or a negative
ion?
Answer:
posotive
Explanation:
electrons give off negative pulse so take one away
Which of the three sub-atomic particles is the lightest?
a The proton
b The neutron
c The electron
d orbital
Answer:
The electron
Explanation:
The electron will be the lightest subatomic particle.
Answer:
The electron
Explanation:
Electron, lightest stable subatomic particle known. It carries a negative charge, which is considered the basic unit of electric charge. The rest mass of the electron is 9.10938356 × 10 −31 kg, which is only 1/1,836 the mass of a proton.
An atom of potassium has 19 protons and 20 neutrons. Its mass number is
Answer:
the mass no. is 39.0983 that is... 40
Lisa's Chemistry class was performing an experiment with gas pressures. They filled a container with gas at a pressure of 101,000 Pa at room temperature. When they doubled the temperature, the pressure also doubled. What was the new pressure in scientific notation?
Answer:
2.02 × 10^5 Pa
Explanation:
According to this question, in an experiment, a container was filled with gas at pressure of 101,000 Pa, at room temperature. When this temperature was doubled, the pressure also increased by two times i.e.
The pressure changed to (101,000 Pa × 2) = 202,000 Pa
This question is asking to represent this in scientific notation. Scientific notation aims at representing a small or too large number in an easy way. It is done by making use of power of ten i.e. a × 10^b
Where; a = decimal number
b = power of ten
In the case of a large number like 202,000, the power of ten is derived by counting the decimal place backwards. If we are to count until we stop in front of the last digit, we will have 5 times.
That is; 2.02000 × 10^5
We can remove every trailing zeros
Hence, the answer is 2.02 × 10^5 Pa.
A chemist prepares a solution of sodium carbonate by measuring out of sodium carbonate into a volumetric flask and filling the flask to the mark with water. Calculate the concentration in of the chemist's sodium carbonate solution. Be sure your answer has the correct number of significant digits.
Answer:
The correct answer will be "[tex]9.45\times 10^{-5} \ mol/L[/tex]".
Explanation:
We have:
Moles of solute (Na₂Co₃) = [tex]18.9 \mu \ mol[/tex]
= [tex]18.9\times 10^{-6}[/tex]
[tex]1 \mu \ mol[/tex] = [tex]10^{-6} \ mol[/tex]
Now,
The volume of the solution will be:
⇒ [tex]0.200 \ L[/tex]
∴ [tex]{1 \ mL=0.001 \ L}[/tex]
The formula to find the concentration will be:
⇒ [tex]Concentration = \frac{moles \ of \ solute \ (mol)}{Volume \ of \ solution \ (L)}[/tex]
On substituting the given values, we get
⇒ [tex]=\frac{18.9\times 10^{-6}}{0.200}[/tex]
⇒ [tex]=9.45\times 10^{-5} \ mol/L[/tex]
Plz help me complete this table
Answer:
9,19,9,10,9,F
15,29,14,15,14,Si
22,47,22,25,22,Ti
25,55,25,30,25,Mn
35,80,35,45,35,Br
8,16,8,8,8,O
47,108,47,61,47,Ag
16,32,16,16,16,S
82,207,82,125,82,Pb
Explanation:
Atomic number = number of protons = number of electrons
Mass number = number of protons + number of nuetrons
If an atom has 18 protons,17 neutrons,and 19 electrons what is the atom electrical charge?
A +2
B +1
C -2
D-1
Answer:
D: -1
Explanation:
18 protons so +18
19 electrons -19
neutrons dont count there neutral
-19+18= -1
Answer: D: -1
Explanation: All protons have a +1 charge, neutrons are neutral, and electron have a -1 charge. Therefore it can be concluded that if the atom has 18 protons which all have +1 charge and 19 electrons which all have -1 charge, then the atom will have a -1 charge since 18-19=-1