The columns into which the elements were split are called groups and the elements in the same group display similar properties.
What is a group?A group refers to elements that have similar chemical properties and occur in the same column in the periodic table.
Hence, the columns into which the elements were split are called groups and the elements in the same group display similar properties.
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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
Anyone Help please??
a. 0.5 mol
b. 25 cm³
c. (i) 75 cm³
(ii) 50 cm³
Further explanationAvogadro's hypothesis:
In the same T,P and V, the gas contains the same number of molecules
So the ratio of gas volume will be equal to the ratio of gas moles
[tex]\tt \dfrac{V_1}{n_1}=\dfrac{V_2}{n_2}[/tex]
Reaction
2NO(g)+O₂(g)⇒2NO₂(g)
a. mol O₂
[tex]\tt mol~O_2=\dfrac{1}{2}\times 1~mol~NO=0.5[/tex]
b. volume of O₂
[tex]\tt \dfrac{50}{1}=\dfrac{V_2}{0.5}\rightarrow V_2=25[/tex]
c. (i)total volume
[tex]\tt volume~NO+volume~O_2=50+25=75~cm^3[/tex]
(ii)volume of NO₂
[tex]\tt mol~NO_2=mol~NO=1\rightarrow V~NO=V~NO_2=50~cm^3[/tex]
SOMEONE HELP ME PLEASE ILL GIVE BRAINLY
Snapping an instant cold pack is a
Change in temperature
Formation of gas/bubbles
Formation of precipitate
Release of energy (fire/light)
Change in color
Answer:
Formation of precipitate?
Explanation: When you do that the thingy dissolves the thingy so the thingy dissolves into nothingness of the nothing...
I. Name the following ionic compound
1. NaBr
2. CaO
3. Li2O
4. MgBr2
5 Be(OH)2
Which one is correct?
Explanation:
c dormancy :)))))))))))
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)
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.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.
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."
Please help me I will mark you as BRAINLIST
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.
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.Ionic crystals are typically brittle because distortion of the crystal lattice produces:-
a) Flow of the electrons b) Ionization of same atoms
c) Inter ionic attractions d) Inter ionic repulsion. e) None.
Answer:
b I my current pls let me known
How many moles are there in 5.7 x 10^25 molecules of Na2SO4? *
Explanation:
two moles sodium (45.98 g), one mole sulfur (32.06 g), and four moles oxygen (64.00 g) combine to form one mole of sodium sulfate (142.04 g).
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:
A cup of water (75.0 g) is heated from 25.0°C to 76.0°C. How much energy is absorbed from the surroundings?
Answer: 15990 J (or something close to that if its multiple choice)
Explanation: So I did the math with my friend and I just took a test on this and I got it right soooo,
you take 75 (your mass) and multiply it by 4.18 (the heat capacity of a liquid) and then times that answer by 51 which is the temperature from subtracting your initial heat (25.0 C) to your ending heat (76.0 C) and all that together is 15988.5. With the significant figures included, my test answer was somewhere around 15990 J (sorry if it's not specific)
Hope this helps, I'm pretty clueless on these equations lol.
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:
ﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺﷺ
How is it possible for light to change genetic material?
Answer:
When light hits CRY2, it changes shape and binds to its natural partner protein, known as CIB1. When light shines on the cells, the CRY2 protein binds to CIB1, which is floating in the cell. CIB1 brings along a gene activator, which initiates transcription, or the copying of DNA into mRNA.
Explanation:
1) If volcanoes form at convergent subduction boundaries type “yes”, otherwise type “no.”
2) If earthquakes happen at convergent subduction boundaries type “yes”, otherwise type “no.”
If 18 grams of oxygen reacts completely with 4 grams of hydrogen, we would expect how many grams of water? Question 4 options: Less than 22 grams because some mass is lost in the reaction More than 22 grams because the oxygen gains mass during the reaction 22 grams because mass cannot be created or destroyed There is no way to tell from this information.
Answer:
Less than 22 grams because some mass is lost in the reaction
Explanation:
Took the test on K12
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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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.
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 picture shows a statute of Abraham Lincoln
Your friend tells you the statute has a dull luster. What does luster tell you about a mineral?
o the color it makes when rubbed against a hard surface
O how hard the mineral is
O what color the mineral is
O how light is reflected from the surface of the mineral
Answer:
How light is reflected from the surface of the mineral.
Explanation:
To know the the correct answer to the question, we must bear in mind the meaning of luster.
Luster simply means the shining properties of a substance when light ray fall on them.
Thus, considering the question and the options given above, luster simply indicates how light is reflected from the surface of the mineral.
Answer:
d
Explanation:
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:
Actual answer please
A chromate ion consist of four oxygen atom bonded to be a chromium atom. It has two extra electrons. the formula for this
Answer:
Cr04^2-
Explanation:
Which of these is an example of a direct observation? Choose the correct answer.
using a cornstarch solution to simulate Earth’s mantle
drilling into Earth to remove rock samples for analysis
comparing Earth’s convection to water heating in a pot
pushing rubber mats together to predict the behavior of plate tectonics
Answer:
pushing rubber mats together to predict the behavior of plate tectonics
Explanation:
pushing rubber mats together to predict the behavior of plate tectonics is an example of direct observation because direct observation involves the process of using your senses and evaluating or observing closely the subject matter in other to gather informations. Through direct observations you can gather informations through activities, behaviors without depending on people's opinions to gather information needed.
