10. A water molecule is made up of one oxygen atom and two hydrogen atoms. Why is water
considered a
pure
substance?
1 point
M
A. Water can be broken down by physical means.
B. Water can be combined with other substances by physical means.
C. Each water molecule is identical.
D. Water molecules are made up of different types of atoms
How can I get the 3 significant figures (sig figs) out of this number 241.1535
please help me idk how to get it.
241.1535
Answer:
241
Explanation:
all the numbers are significant but since you only need three it's only the first three numbers
Can someone help me plz :/
I think its the
2nd one
What is the difference in the molecular formula of 2 successive members of the homologous series of a carbon additive?
SOME HELP WOULD BE NICE!!! PLEASEEE
Continental crust is less dense than oceanic crust because it contains less:
Question 5 options:
Silicon
Oxygen
Aluminum
Iron
Answer:
Iron
Explanation:
The continental crust is less dense than oceanic crust because it contains less amount of iron.
The continental crust is predominantly rich in alumino-silicates.
Although compared to oceanic crust, the continental crust is thicker. The oceanic crust is made up of iron and magnesium rich minerals. They are called mafic minerals. These minerals are much denser than the alumino-silicates.Chemical reactions happen when
Answer:
Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products
Explanation:
I. Name the following ionic compound
1. NaBr
2. CaO
3. Li2O
4. MgBr2
5 Be(OH)2
Please help me I will mark you as BRAINLIST
What happens if you try to move the atoms very close together?
Answer:
When you try to move the atoms two close, their positive nuclei repel each other. 2. A covalent bond is an electric force of attraction between two atoms that share outer electrons. ... The protons in each nucleus are repelling each other strongly, it takes more energy to move the atoms closer together at this point.
Explanation:
how many moles are in 174g of NaCL?
FISH BOWL REAL IT IN ITZ ME AND MY FREIND GO BUDD WORK WORK. LOLLLLLL
Answer:
58.44277 grams
Explanation:
Im in middle school and I know this! LOL
Based on the image below, what is the atmospheric pressure?
1) 0.5 atm
2) 1 atm
3) 1.5 atm
4) 2 atm
5) it is impossible to tell
Answer:
1 atm
Explanation:
Given:
Atmospheric pressure = 760 torr
Find:
Atmospheric pressure in atm
Computation:
We know that ;
1 torr = 0.00131579atm
So,
760 torr = 760 x 0.00131579atm
760 torr = 1 atm (Approx)
Atmospheric pressure in atm = 1 atm
The diagram below has an atmospheric pressure of 760 torr. The
atmospheric pressure will be 1 atm.
This is calculated by converting Torr to atm which are both units of pressure.
The standard conversion formula is
1 torr = 0.00131579atm.
This means that
760 torr = 760 x 0.00131579atm
760 torr = 1 atm
Atmospheric pressure in atm is therefore 1 atm.
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Electronegativity for boron is 2.0, and electronegativity for fluorine is 4.0. Which type of bond forms between boron (B) and fluorine (F) in BF ? ( the photo is how the BF is supposed to look like with the 3)
A) ionic
B) metallic
C) polar covalent
D) nonpolar covalent
Answer:
ionic.
Explanation:
the electronegativity difference is greater than 1.7.
The type of bond between boron and fluorine in BF₃ is non-polar covalent bond.
What is covalent bond?
Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.
Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.
Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.
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When an electron releases energy in an atom what happens to it
Answer:
When an electron absorbs energy, it jumps to a higher orbital. This is called an excited state. An electron in an excited state can release energy and 'fall' to a lower state. When it does, the electron releases a photon of electromagnetic energy.
Explanation:
In a lab investigation, one group of students (group A) measures the speed of a 0.1 kg toy car to be 2.5
m/s at the bottom of a ramp. Another group of students (group B) measures the speed of the car to be 3 m/s at the bottom of the ramp. The car's starting position at the top of the ramp is 1 m high. Calculate the kinetic energy of the car for group A
Answer:0.98 J
Explanation:
PE=mpg
PE=0.1x9.8x1
PE=0.98J
Jorge's experiment involved which of the following?
Answer:
C. A physical change.
Explanation:
Given the image shown below.
It can be seen that the experiment is about phase changes of a substance. And phase changes of a substance is being done or carried out when the substance has passed through any of the processes such as melting, boiling, freezing, condensing, depositing, or sublimation.
And since these changes in the phase of a substance do not change the substance's chemical nature. It is called a physical change.
Therefore, in this case, Jorge's experiment involved "A physical change."
How many bonds are there in the molecule Br2
Answer:
covalent bonds please mark me brainliest
3 Reasons why animals migrate
Answer:to find a mate, because of a diminished food source, drought, flooding, volcanic activity, destruction of habitat, human presence in a habitat, an earthquake, seasonal changes, overpopulation of an area
Explanation:
The chemical you start with before the reaction are called reactants. What are the materials you end up with after the reaction called?
Answer:
Products
Explanation:
The materials you end up with in a reaction are called the products of the reaction.
For example;
A + B → C + D
A and B are the reactants
C and D are the products.
In a chemical equation, on the left hand side, A and B, we usually have the reactants. The right hand side C and D is the product of the reaction.4. The following element contains 12 protons and a mass number of 24. Which of the following statements is NOT correct about it? * O It contains 24 neutrons O It contains 12 electrons O Its atomic number is 12 O its contains 24 nucleons.
Answer:
It contains 24 neutrons.
Explanation:
Mass number = Protons + Neutrons
If you were to have 24 neutrons, the mass number would be 36, invalidating the known information. You have 12 protons and 12 neutrons to form a mass number of 24. Remember that your protons are the same thing as the atomic number, so you can make an equation using your known information to derive true statements.
CO2
NaCl
HCl
These may all be classified as
A) elements and compounds.
B) elements and molecules.
C) elements and pure substances.
D) compounds and pure substances.
Answer:
a element and compounds
Answer:
The answer is D) compounds and pure substances.
Explanation:
Here's why: All three items are examples of compounds and pure substances. They are not pure elements or molecules.
Which two scientists’ theories supported the general consensus of the people and religious teachings of the time?
(One Answer)Thx !!!!
Aristarchus and Aristotle
Aristotle and Ptolemy
Ptolemy and Copernicus
Galileo and Aristarchus
Answer:
Your answer would be:
Aristotle and Ptolemy, so answer B).
(if you use edge, than this should be correct)
Sorry about this answer being late, I just discovered it
Answer:
b
Explanation:
Heat passes from__________ to ________________
Answer:
How does heat move?
Heat moves in three ways: Radiation, conduction, and convection.
Radiation happens when heat moves as energy waves, called infrared waves, directly from its source to something else. This is how the heat from the Sun gets to Earth. In fact, all hot things radiate heat to cooler things. When the heat waves hits the cooler thing, they make the molecules of the cooler object speed up. When the molecules of that object speed up, the object becomes hotter.
Explanation:
A molecule has two hydrogen atoms, one carbon atom and three oxygen atoms.
Answer:
actually its d
Explanation:
J
J h2co3
two hydrogen(H2)
1 carbon (C)
3 oxygen (o3)
What is the relationship between the electronic configuration, group and period numbers?
Can someone please answer this.
Answer: the number of circles in the electronic configuration of an element is represented in the periodic table as the period number that element is situated in. the number of electrons in the outermost shell of an element is represented in the periodic table as the group number that element is situated in.
Explanation: hope it helps :)
How many atoms of oxygen (O) are represented in the chemical formula shown below?
2 CO2
1 atom of oxygen
2 atoms of oxygen
6 atoms of oxygen
4 atoms of oxygen
Answer:
4 atoms of oxygen
Explanation:
2 atoms of oxygen gas O2
Answer:
4 atoms of oxygen
Explanation:
The given chemical formula is:
2CO₂
Unknown is the number of atoms;
There are :
C : 2 atoms of carbon
O: (2 x 2) atoms of oxygen in the given molecule
4 atoms of oxygen
Which one is correct?
Explanation:
c dormancy :)))))))))))
Si escuchas a alguien decir que la corriente eléctrica en un sircuito sale por el polo negativo de la pila y entra por el polo positivo ¿a cual sentido de la corriente eléctrica se está refiriendo? A) al sentido convencional de la corriente eléctrica. B) al sentido real de movimiento de electrones.
Answer:
It refers to the conventional sense of the elastic current
Explanation:
It is the traditional or the conventional sense of the elastic current as in the earlier days the experimenters and the scientist thought that the current moves out of the positive terminal or pole of the battery and enters through the negative pole or terminal of the battery.
It is because of the direction of the current flow as thought in early days, the sentence refers to the conventional sense.
I NEED HELP ASAP IM ON TIMER!!!!!!
Which of these refers to the strength of an acid?
a measure of the quantity of acid dissolved in water designated by molarity
an intrinsic characteristic of a particular acid, not related to concentration
the amount of hydrogen ions present in the acid
the amount of hydroxide ions present in a solution
Answer:
an intrinsic characteristic of a particular acid, not related to concentration
Explanation:
this is easy
An intrinsic characteristic of a particular acid is not related to concentration. Hence, option B is correct.
What is an acid?An acid is any substance that tastes sour, changes blue litmus paper to red, reacts with some metals to liberate hydrogen, and reacts with bases to form salts.
Whereas pH measures the concentration of solvated protons and does not tell us about the intrinsic acidity of chemical species present in solution, electrode potentials tell us about the intrinsic oxidizing power of the species present but provide no information on their concentration.
By the addition of a sufficient amount of redox indicator to a solution, its redox potential can be measured using redox electrodes.
Hence, an intrinsic characteristic of a particular acid is not related to concentration.
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Explain where you would find the three different types of muscles (cardiac, smooth and skeletal) and how these different types of muscles are used in the body.
Explanation: Skeletal muscle, attached to bones, is responsible for skeletal movements. The peripheral portion of the central nervous system (CNS) controls the skeletal muscles. Thus, these muscles are under conscious, or voluntary, control. The basic unit is the muscle fiber with many nuclei. These muscle fibers are striated (having transverse streaks) and each acts independently of neighboring muscle fibers.
Complete the sentence. The lower the hydrogen ion concentration, the ______ the pH. higher lower closer to 7 closer to 0
Answer:
the higher the pH
Explanation:
Answer:
Hes right i took the quiz
Explanation:
