Answer:
Mercury
Explanation:
The old school laboratory thermometers were made from the liquid metal Mercury. It is a toxic element and must be handled with care.
Nowadays, we use digital thermometers, which are safer and provide a more accurate reading.
Three out of 7 students at the dance were boys if 140 students attended the dance how many were girls enter number of girls here ___
state the characteristics of transition metals
Answer:
Conductivity, Malleability, High Melting Point, Luster
Explanation:
Transition metals have the following properties:
Conductivity (Electrical and Thermal)
Malleability (You can hit it with a hammer to mold it)
High melting point
Luster (Shininess)
Explain the difference between pure substances and mixtures.
Answer:
A pure substance consists only of one element or one compound, whereas a mixture consists of two or more different substances, not chemically joined together.
In a gas, properties such as density and temperature will affect the speed of a wave. For instance, particles in dense, cold air will move a lot slower than particles in hot air. options: True False
Answer:true
I hope this helped! if you need explanation just ask.
Select all that apply.
Which valences have the greatest tendency to form ions?
+1
+2
+3
-4
+4
-2
-3
-1
Answer:
+1,-1,+2,-2,+3,-3
Explanation:
As new information is discovered, scientific theories are changed. Sometimes, old theories are revised. Why is this a necessary practice for science? Group of answer choices Old theories are dependent on primitive technology that was flawed, so new technology must be used. The process allows for an increasingly accurate understanding of the world It ensures that the newest ideas are the ones used to develop medicines and important safety equipment. New scientists need to get credit for their ideas or no one will go into science professions
Answer:
Old theories are dependent on primitive technology that was flawed, so new technology must be used.
Explanation:
The process of science is an unending process of inquiry into the nature of the universe. This inquiry into the nature of the universe is aimed at understanding of how things work and how the natural course of the universe can be exploited for man's good.
As new scientific evidences emerge, old theories are revised because we understand the world better, better technology is used to investigate nature in order to get a clearer view of natural phenomena.
Most old theories depend on obsolete technology, hence modern day sophisticated equipment must be used to correct the flaws of old theories.
What is an energy sublevel?
A. The level of energy possessed by all electrons in one type of orbital
B. The energy required to gain electrons to form an octet
C. The energy contained within the nucleus of an atom
D. The amount of energy lost when 2 electrons are paired
Answer: A. The level of energy possessed by all electrons in one type of orbital. OR C. The energy contained within the nucleus of an atom.
Explanation: In chemistry, it would be A., but in physics, it would be C. It really depends on which subject in Science you’re doing. If you’re doing chemistry, choose A, if you’re doing physics, choose C.
An energy sublevel is A. The level of energy possessed by all electrons in one type of orbital.
What is an energy sublevel?An energy sublevel refers to the amount of energy that is possessed by all the electrons residing in an orbital. The energy sublevel can be ordered in the s, p, d, and f levels.
So, these are the orbitals described by the energy sublevel. The correct option number that describes the energy sublevel is then this; A. "The level of energy possessed by all electrons in one type of orbital."
Learn more about energy sublevels here:
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the balanced chemical equation for one neutralization reaction. In your equation, which reactant contributed the salt's positive ion? Which one contributes the salt's negative ion?
Answer:
See the answer below
Explanation:
A neutralization reaction is a reaction that involves acid and base with the production of salt and water as the end products. An example is as below:
HCl + NaOH --> NaCl + H2O
The salt produced here is NaCl. In solution, NaCl will ionize as:
[tex]NaCl --> Na^+ + Cl^-[/tex]
Hence, the salt's positive ion (Na+) was contributed by the base (NaOH) while its negative ion (Cl-) was contributed by the acid (HCl).
Which organ contracts and causes pressure change in the chest cavity during breathing?
diaphragm
lungs
trachea
bronchus
Answer:
Diaphragm
Explanation:
I hope this helps!!
Which of the following provides the best explanation for the chemical similarities
between sodium and potassium?
A:Both are solids at room temperature.
B:Both have the same number of occupied energy levels
C;Both have one valence electron.
D:Both have average atomic masses between 20 and 40 amu.
Answer:
C ;Both have one valence electron.
Explanation:
Elements classified to be in the same group in the periodic table possess the same number of valence electrons. This means that they will react the same way with other elements as they require the same number of electrons to fill their electron shell.
This is the case of sodium (Na) and potassium (K) which both belongs to group 1. This means that they have one valence electron in their outermost shell. Hence, this accounts for the reason they both will behave chemically similar to one another.
How many total hydrogen atoms are there in the compound CH3(CH2)2CH3
Answer:
10 atoms of hydrogen
Explanation:
The atom of an element refers to the smallest indivisible substance of that element that retains its chemical properties. The atoms of an element combine to form a molecule, which then combines with atoms of other elements to form a compound.
In this case, CH3(CH2)2CH3 is a given organic compound. The number of hydrogen atoms can be determined thus:
H represents one hydrogen atom
- We have H3 - 3 atoms
- We have (H2)2 - 4 atoms
- We have H3 - 3 atoms
Altogether, this gives a total of 10 hydrogen atoms in the CH3(CH2)2CH3 compound.
Julius went swimming at the lake. While he was playing on the shore, he found
a rock and a stick, and he threw them both in the lake. The rock sank to the
bottom, and the stick floated on top of the water. What must be true about the
stick and the rock?
Answer:
the rock is dencer than the water and the stick has more surface tension.
Answer:
The rock is heaver so it sinks to the bottom of the lake, and the and the stick is lighter so it floats.
Hope this helps☺️
Given .20 mol C3H3, how many moles of CO2 will be produced? C3H8 +02 -> CO2
+ H2O
Explanation:
20 molecules of C3H8 react with _100_ molecules of O2 to produce _60_ molecules of CO2 and
_80_ molecules of H2O. Use stoichiometric ratios from the balanced equation.
Hope this helps!
please help i will mark brainlist
Answer:
The answer is 4
Explanation:
Carbon has four valence electrons and here a valence of four. Each hydrogen atom has one valence electron and is univalent
Answer:
there are 4 valence electrons, they are the ones on the outmost ring :)
Explanation:
sorry i typed it in the wrong place
At a constant temperature a tire has a pressure of 445 kPa and volume of 18.3 L. If the volume increases to 22.4 the new pressure of the tire will read ____kPa. Report your answer to the nearest whole number.
Answer:
P₂ = 364 KPa
Explanation:
Given data:
Initial pressure = 445 KPa
Initial volume = 18.3 L
Final volume = 22.4 L
Final pressure = ?
Solution:
The given problem will be solved through the Boly's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
445 KPa × 18.3 L = P₂ × 22.4 L
P₂ = 8143.5 KPa.L/22.4 L
P₂ = 364 KPa
Complete the following equations (note that the equations are not balanced). Use the activity series if
necessary.
Li>K> Ba > Sr > Ca > Na > Mg > AI > Mn > Zn > Cr> Fe > Cd >
CO > Ni > Sn > Pb > H > Sb > Bi > Cu > Ag > Pd > Hg > Pt> Au
C3H2 +02 →?
C + H20
CH3OH + H2
CO2 + H2O
Chemistry
Answer:
CO2+H20 for the first question, AlCl3 + Ag for the second or C and B
Explanation:
I am looking at it right now on Edge
c) CO₂ + H₂O
C₃H₈+O₂→ CO₂ + H₂O
Explanation:
Firstly we need to know about combustion, it is a chemical process which involves the reaction of a substance with oxygen.
The chemical reaction given below represents the combustion of propane which yields to the production of carbon dioxide and water molecule.
C₃H₈+O₂→ CO₂ + H₂O
The balanced chemical reaction is represented below:
C₃H₈ +5O₂ → 3CO₂ + 4H₂O
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Which section of the periodic table has properties of both a metal and a nonmetal?
Answer:
The metalloids are a unique group of elements that share properties of both metals and nonmetals. They're also called the semimetals because of the shared properties of these elements along the dividing line between metals and nonmetals.
Elements: Arsenic
Explanation:
brainlist pls thx
List the steps to write the shorthand electron configuration of argon.
Answer: 1s22s22p63s23p6.
Explanation:Therefore the Argon electron configuration will be 1s22s22p63s23p6. Because the third energy level has eight electrons and is therefore full (3s23p6) it is called a noble gas.
Which contains the most number of total atoms?
CH1206
CO2
2H2O
MO
Answer:
ch1206
Explanation:
it definitely is
How do I calculate the density of benzene if 0.10L has a mass of 36.4g
Is it possible to turn an ordinary substance into gold? In simple words
Answer:
Yes, gold can be created from other elements. But the process requires nuclear reactions, and is so expensive that you currently cannot make money by selling the gold that you create from other elements. ...
Explanation:
Please answer all and I will give you 50 points, you need to pick one for each
Answer:
1. 3
2. 2
3. 4
4. 1
Explanation:
How many conversion factors would be used to convert 20 hectoliters to milligrams?
24343
is your answer for the question
How is it possible that a substance like liquid nitrogen can boil when it is very cold?
help needed...
Answer:
Liquid nitrogen, on the other hand, boils at a much colder temperature. Liquid nitrogen boils at -320 degrees. That means that as soon as LN2 leaves our special holders and hits the air, it instantly vaporizes because the air around it is so cold.
Explanation:
What does "naked" DNA mean
Answer:
it means plasmid dna
Explanation:
The naked DNA is a free DNA without surrounded by any protein or lipid layer. Also, The naked DNA is called plasmid DNA
i have advanced so i got this right
Answer: Naked DNA refers to DNA that is not associated with lipids, proteins, or any other molecule to help protect it. Naked DNA is the result of release of genetic material into the surrounding environment, such as from bursting cells. Incoming DNA is often incorporated into the bacterial genome after absorption.
How many Pb and Kr atoms are there in Pb9(Al5Kr7)4?
can anyone help mwe? i needs help :(
Pb = 9
Kr = 28
Further explanationProust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements
In the same compound, although from different sources and formed by different processes, it will still have the same composition/comparison
Compounds can be formed from several elements, which can be the same or not .
The composition of the constituent elements is usually expressed in subscript
For compound : Pb₉(Al₅Kr₇)₄
The number of Pb atoms = 9
The number of Kr atoms = 7 x 4 = 28
All of the statements below correctly describe eukaryotic cells. Some of the statements
also correctly describe prokaryotic cells. Which statement correctly defines a eukaryotic
cell, but not a prokaryotic cell?
Performs metabolic processes with the help of chemicals.
The flow of nutrients and wastes occurs across a membrane.
O Utilizes a nucleus to contain its DNA.
O Contains DNA as genetic material.
Hi! I am here to help so the answer is ,Utilizes a nucleus to contain its DNA!
(03.06 MC)
What is the strongest intermolecular force between an NaCl unit and an H2O molecule together in a solution? (4 points)
Group of answer choices
Covalent bonding
Dipole-dipole force
Hydrogen bonding
Ion-dipole force
Answer:
Hydrogen bonding
Explanation:
Its my answer
Briefly explain in a few sentences the differences between how a sunflower gets energy and a squirrel gets energy. Include the words glucose, produces, and consumes in your answer.
Answer:
Explanation:
A sunflower, which is a plant, obtains its energy from the sunlight during a process called photosynthesis. This process uses the photons from the sunlight as energy to fixate CO₂ (which is in the air). This CO₂ is fixated and metabolized by the plant and produces glucose as the final product.
A squirrel, which is an animal, obtains its energy by the degradation of compounds found in the food (for example, a nut). Among other components, we can find carbohydrates, especially polymers formed by glucose monomers bound together. This polymer is first degraded by the saliva to monomers of glucose. This glucose is internalized and metabolized by the cells and after its lysis and passage through the Calvin cycle, it produces energy in the form of ATP and CO₂ as a final product (this process is called respiration).
Which mineral is found in both limestone and marble?
Answer:
Calcite
Explanation:
it is am mineral made up mostly of calcium carbonate
Answer:
Calcite is the answer your looking for.
Explanation:
Brainliest?