Answer:
A sodium atom.
Explanation:
A sodium atom contains 11 protons and 12 neutrons and its mass is 23.
why did the atomic model theory change over time
Answer:
The atomic theory has changed over time as new technologies have become available. Scientific knowledge builds on past research and experimentation. 400 B.C. Democritus, a philosopher in ancient Greece, began the search for a description of matter.
Explanation:
Osmium is the most dense element we know of. A 22 g sample of Osmium has a volume of 100 cL. Calculate the density of Osmium in g/mL. *Hint: In order to do this you will first need to convert the volume into mL, and then divide. Grams into mL a. Converted volume. 1 mL = 0.1 cL ---------- b. Density (g/mL) = __________
Answer:
a. V = 1000 mL
b. Denisty = 0.022 g/mL
Explanation:
a.
First we need to convert the volume of the Osmium into mL. For that purpose we are given the conversion unit as:
1 mL = 0.1 cL
Hence, the given volume of Osmium will be:
V = Volume of Osmium = 100 cL = (100 cL)(1 mL/0.1 cL) = 1000 mL
V = 1000 mL
b.
The density of Osmium is given by the following formula:
Density = mass/Volume
Denisty = 22 g/1000 mL
Denisty = 0.022 g/mL
I need help please.
Match the term with the definition. Match Term Definition Condensation A) A phase change from a gas to a liquid Melting B) A phase change from a liquid to a solid Sublimation C) A phase change from a solid to a liquid Freezing D) A phase change from a solid to a gas
OK, so since this question is corrupt, lets fix this.
Answer:
1. Sublimation: C
2: Melting: B
3: Freezing: D
4: Evaporation: A
Explanation:
In the lesson, we learned that Sublimation is like a solid turning into gas (vapor). For melting, we learned that it is a solid that turns into a liquid, example of melting is snow turning into water. For Freezing, we learned that it is a liquid turning into a solid, example of freezing is water turning into snow. For evaporation, it is a solid turning into a gas like vapor for example, example of evaporation: We know that when we mix Dry Ice with water, we get a chemical reaction, Dry Ice with water creates carbon dioxide smoke (fog).
Hope this answer helps!
I had this on my science test! A liquid changes into a solid is called freezing or solidation. The process of a solid becoming a liquid is called melting. A gas changes to a solid is called sublimation. When a gas changes into a liquid, it is called condensation. A liquid changes to a gas is called evaporation!
I never ask, but can I have Brainlest PLS?
What is a type of
rock that develops
from molten rock
cooling above the
earth's surface ?
A neutral atom has an atomic mass of 7 and atomic number of 3. Which of the following state is true? *
A.The atom has 3 protons, 3
electrons, and 4 neutrons
B.The atom has 7 protons, 3 electrons, and 3 neutrons
C.The atom has 4 protons, 4 electrons, and 3 neutrons
D.The atom and 3 protons, 4 electrons, and 7 neutrons
Which is stronger an acid or an alkali
Answer:
.AN ACIDExplanation:
is the stronger
both will be equally strong because when you add them together with a pretty much equal ph such as 5 and 9 ph then it makes it neutral meaning they are just as strong as eachother
The electronic configuration of phosphorous is 2.8.5. Explain, in terms of its electronic configuration, why phosphorus is in group 5 of the periodic table.
PLEASE HELP I WILL GIVE BRAINLIEST
Answer:
Explanation:
phosphorus belongs to group 5 of the periodic table because it has 5 electron in its outermost shell the number of electron in the outermost shell of electron determine the group of the element in the periodic table
In fact the group number of phosphorous by the modern laws of periodic table is 15 which is 10 added with the number of its valence electrons.
What is group number.Every elements are classified into different periods and groups in periodic table. The horizontal rows in periodic table are called periods and the vertical columns are the groups.
From left to right in a period the atomic number for each element increases by one. A group contains elements with same number of valence electrons and similar chemical and physical properties.
There are 18 groups in periodic table. Elements with 1 and 2 valence electrons are in group and 1 and 2 respectively. From 3 valence electrons onwards, the group number is 10 added to the number of valence electron.
Phosphorous contains 5 valence electrons thus, it is classified to 15th group.
To find more on groups in periodic table, refer here:
https://brainly.com/question/13219625
#SPJ5
How does an objects velocity affect its interia?
what is an atom? please answer ASAP
Answer:
smallest particle of an element which can take part in a chemical reaction
Explanation:
there are atoms of different elements is sodium atom
Brainliest! Please help me out with this simple question! :)
I don't understand what the 14 and the 6 are and how to find them :/
A balloon (approximate as a sphere) is inflated such that it’s radius is 7.00 cm. What is the volume of the air inside the balloon in mL?
Answer:
1436
Explanation:
Why were chlorofluorocarbons first developed?
Why did the thirteen American colonies want to purchase goods from the West Indies? A.The West Indies were the only places that would trade with them. B.The West Indies were the only places that made high-quality goods. C.The West Indies gave the colonies the chance to trade with other countries. D.The colonies wanted to avoid a potential conflict with the West Indies.
Answer:
b
Explanation:
Answer:
The correct answer is C. "The West Indies gave the colonies the chance to trade with other countries."
Explanation:
The thirteen American colonies wanted to purchase goods from the West Indies because the West Indies gave the colonies the chance to trade with other countries. Option C is correct.
The thirteen colonies were: Delaware, Pennsylvania, New Jersey, Georgia, Connecticut, Massachusetts Bay, Maryland, South Carolina, New Hampshire, Virginia, New York, North Carolina, and Rhode Island and Providence Plantations.
The Thirteen Colonies, also called the Thirteen American Colonies were a group of British colonies on the Atlantic coast of North America founded in the 17th and 18th centuries.
I hope this helps!!
Explain why a fluoride ion is smaller than a chloride ion.
Answer:
Fluorine element has less orbitals than chlorine.
Explanation:
They are both in the same group so they have to gain the same amount of electrons(which will not effect shape)....However on going down the group one notices that the atoms get larger as more orbitals are needed to hold the electrons.
NASA uses radar to track as much space junk as possible, but it's estimated that millions of pieces
aren't being detected. Why?
a. These pieces are too small.
b. Junk that is made of metal reflects radio waves.
c. NASA's radar covers only the area of space above North America.
d. All of the above
Can someone double check my work? I'm really not sure about the last one, but I do need all of them checked.
I got:
a) exo
b) endo
c) endo
d) endo
How many grams in 25Kg?
Answer:
it adds up to 25000 grams
How many significant figures are in 8.00 (10)-3
Answer: 1 significant figure
Explanation: 8.00*10^-3 is simply 1000/8 which will give you 0.008 and in significant numbers do not count zero.
So there you have one significant figure which is the figure 8
Find the volume of a rock made out sandstone with a density of 2.4 g/cm^3 and a mass of 8.5g.
How can you identify the different elements found on the periodic table?
Answer:
In the typical periodic table, each element is listed by its element symbol and atomic number. For example, “H” denotes hydrogen, “Li” denotes lithium, and so on. Most elements are represented by the first letter or first two letters of their English name, but there are some exceptions.
John walks 10 miles a day. How many meters does he walk in 5 days?
Answer:
He will burn 50 meters in 5 days
Explanation:
multiply 10 and 5.
Answer:
80450 meters
Explanation:
To go from miles to meters multiply by 1609, so do 1609 x 10. Next, take that number times 5 because that is the number of days.
- Let me know if you need further explanation.
In any chemical reaction, the quantities that are preserved are O A. the number of moles and the volumes B. the number of molecules and the volumes 0 C. mass and number of atoms D. mass and moles
Explanation:
Law of conversation of mass applies in any chemical reaction.
The number of moles can be different for each compound being used, as it is based on the different molar masses of each compound.
Hence, the answer is C. mass and number of atoms.
Convert 43 miles into feet
Answer:
43 miles is 227040
hope this helps
Tiffany was investing how fast it took Hayden to react to different sounds. Identify the independent variable.
Answer:
The different sounds
Explanation:
since it can not be changed
Science can lead to the development of:
What do all atoms of any single element have in common?
A. They all have the same number of electrons.
B. They all have the same properties.
c. They all have the same atomic number.
d. They all have the same atomic mass.
Answer: They all have the same atomic number
Explanation: apex
Answer:
c. They all have the same atomic number.
Explanation:
The other user is correct!
The ancient philosophers discussed the world around them
but did not do any experiments or detailed observations.
TRUE
FALSE
Answer:
FALSE
Explanation:
1
Wood is burned in a campfire. Determine the type(s) of energy present before and after the reaction
-What important role does chemistry play in society?
Answer:
Chemistry helps in improving the quality of our life, it helps in improving food production, building & construction, military and space science, clothing materials, medicine and transportation.
