Answer:
Mass of Ca in sample, Mass of Br in sample, Number of moles of Ca in sample, Number of moles of Br in sample, Mass or moles of element other than Ca or Br in sample
Explanation:
The AP Classroom will not count your answer to this question as correct unless it includes at least one of the answers listed above. If you say that theanswer to this question is density, it will be marked as incorrect, I found that out the hard way when I used the answers that brainly gave me.
Good luck,
I applaud you for using the sources avalible to you, which is /definetly not/ cheeting.
What are the units for Rf values? Please help!
Answer:
Microwatts.
Explanation:
RF + EMF Unit Conversion Charts: Interpreting exposure levels. When measuring Radio Frequencies, the most common units of measurement are microwatts per square meter (µW/m2), microwatts per square centimeter (µW/cm2) and volts per meter (V/m).
Answer:
No units
Explanation:
In Thin Layer Chromatography (TLC), retention factor (Rf value) is found by taking the distance travelled by the spot divided by the distance of the solvent front. Rf value is a ratio of distances hence they have no units.
Mathematical derivation
The distance travelled by the spot is in cm, and that of the solvent front is also in cm. Thus, dividing the two units would give us no units for the Rf value.
What is TLC?
TLC is a technique used for separation and identification. The stationary phase is polar while the solvent is relatively nonpolar. Thus, the less polar substance is more attracted to the solvent (according to the principle of 'like attracts like') and travels further and thus have a higher Rf value.
To learn more about Rf values, check out: https://brainly.com/question/14393140
what is strong interaction in atoms
Answer:
Alternative Titles: nuclear force, strong interaction, strong nuclear force. Strong force, a fundamental interaction of nature that acts between subatomic particles of matter. The strong force binds quarks together in clusters to make more-familiar subatomic particles, such as protons and neutrons.
How many moles ar Li are in 9.53x^24 atoms of Li?
Answer: 15.83 mol
Explanation:
To convert from atoms to moles, we will need to use Avogadro's number.
Avogardo's number: 6.022×10²³ atoms/mol
[tex]9.53*10^{24} atoms*\frac{1mol}{6.022*10^2^3 atoms} =15.83 mol[/tex]
Now, we know that there are 15.83 moles.
Which of the following happens during a chemical reaction?
Atoms of reactants are destroyed.
New atoms are created to form the products.
Atoms of reactants rearrange to form new substances.
The total mass of the reactants is less than the total mass of the products.
Answer:
Atoms of reactants rearrange to form new substances
Explanation:
During a chemical reaction, atoms of reactants rearrange to form new substances.
What is a chemical reaction?Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
Learn more about chemical reactions,here:
https://brainly.com/question/29762834
#SPJ2
What happens when aluminum fills its valence shell? A. Three electrons are gained, creating Al−3. B. Three electrons are gained, creating Al+3. C. Three electrons are lost, creating Al−3. D. Three electrons are lost, creating Al+3.
Answer:
B
Explanation:
Answer:
its D I just took the test
Explanation:
Why is chemistry known as the "central" science?
A. because chemistry involves the study of the central parts of matter
B. because chemistry is fundamental to understanding the other sciences
C. because chemistry is always studied after biology and before physics
D. because chemistry deals with processes that affect living and nonliving things
Answer:
D
Explanation:
Chemistry is often called the central science because of its role in connecting the physical sciences, which include chemistry, with the life sciences and applied sciences such as medicine and engineering. The nature of this relationship is one of the main topics in the philosophy of chemistry and in scientometrics.
A 20 kg curling stone is sliding is sliding in a positive direction at 4 m/s. A second curling stone is sliding at the same speed but in the opposite direction. What is the kinetic energy of the two stones?
Answer:
The kinetic energy of the two curling stones is 320 J
Explanation:
Given;
mass of the first curling stone, m₁ = 20 kg
velocity of the first curling stone, v₁ = 4 m/s
velocity of the second curling stone, v₂ = - 4m/s
assuming the second curling stone to have equal mass with the first stone = 20 kg
The kinetic energy of the first curling stone is given by;
K.E₁ = ¹/₂m₁v₁²
K.E₁ = ¹/₂(20)(4)²
K.E₁ = 160 J
The kinetic energy of the second stone is given by;
K.E₂ = ¹/₂m₂v₂²
K.E₂ = ¹/₂ (20) (-4)²
K.E₂ = 160 J
Thus, the kinetic energy of the two curling stones is given by;
K.E = K.E₁ + K.E₂
K.E = 160 J + 160 J
K.E = 320 J
Therefore, the kinetic energy of the two curling stones is 320 J
100 Points Will Make Brainliest. Help Me Please.
I said glasses and gloves first time and it was wrong.
Which of the items shown here will protect you from a chemical burn? Select all that apply.
A hand in a rubber glove.
A fire extinguisher.
A pair of glasses with clear shields attached on the sides.
A power source.
If the glasses and glove were wrong then I would chose the fire extinguisher and the power source should be the correct answer.
That's just what I would do though.
Answer:
rubber gloves and glasses
Explanation:
rubber gloves and glasses
What do you think it means to use science to answer a question?
*ANSWER AND ILL GIVE YOU BRAINLIEST ANSWER*
Answer: Science is an accurate measure of whats true, there are laws of science like physic, and mathematics and you can prove your answer by using science
Explanation:
3
Write the alpha decay WITH gamma emission for the following element:
92
AL
27
Answer:
Explanation:
In alpha decay alpha ray comes out . Apha ray is nothing but nucleus of helium atom whose atomic no is 2 and atomic weight is 4 . Hence in alpha decay , atomic weight reduces by 4 and atomic no reduces by 2. For gamma emission , there is no change in atomic number and atomic mass.
⁹²₂₇AL ⇒ ⁸⁸₂₅X + ⁴₂He + γ
X is Manganese .
What is the force of gravity acting on an object? (3 points)
Velocity
Mass
Weight
Pounds
the answer of these question is weight
whats an organic chemist
Define and give 3 examples of psychical properties
Answer:
A physical property is any property that is measurable, whose value describes a state of a physical system.
Explanation:
-color
-density
-volume
6.Think about where you live now or where you have lived in the past; use complete sentences to describe this environment and the weather. What building materials do you believe would work well to build a home in that area? Explain why you chose these materials.
Answer and Explanation:
I have always lived in the same region. The region where I live is flat and stable, the site has asphalt and the climate is tropical with a long summer and poorly defined seasons. My region does not have drastic changes and temperature and the climate is hot most of the year. For this reason, it is necessary to use materials that are thermal insulators, on the contrary we need to use materials that are not good thermal insulators such as concrete blocks, bricks, cement and ceramics, we will also need common tiles and rafters to support them.
Mass = 35g Volume = 7cm³ What is the Density?
Answer:
The answer is
5.0 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass = 35 g
volume = 7 cm³
The density is
[tex]density = \frac{35}{7} \\ [/tex]
We have the final answer as
5.0 g/cm³Hope this helps you
A student says: Potassium (K) always has 20 protons. Explain why the student is incorrect.
Explanation:
19
Potassium/Atomic number
This tells you that potassium has 19 protons and - since the number of protons is the same as the number of electrons- also 19 electrons. To find out the number of neutrons you have to look at the atomic mass or weight of the element. This can also be found in the periodic table.
Is this statement true or false? Why?
Chemical reactions are nothing more than rearrangements of protons.
Answer:
False. Answer in pic above
In fact protons have no role in chemical reactions. The regrouping of atoms itself forms the new products in chemical reactions. The reactions involves the loss/gain or sharing of electrons.
What is a chemical reaction ?A chemical reaction is a chemical change in which two or more atoms combine together to form a new product or a compound decomposes to form its constituent compounds. This involves breaking or making of bonds.
In a chemical reaction, no change occurs in the nuclear composition but the valence electrons are involved in the reaction. Atoms loss or gain electrons or share valence electrons with other atoms to form ne compounds.
The electrostatic force of attraction or the overlapping of atomic orbitals make the new products in a chemical reaction. Hence, the statement is false.
Find more on chemical reactions:
https://brainly.com/question/29039149
#SPJ2
how does kinetic energy at the bottom of a hill compared to its potential energy at the top
Answer:
Kinetic energy would have to work ten times harder than potential energy.
Explanation:
Let’s say you have a boulder and your asked to push it up the hill it would be difficult right? But lets reverse the situation what if you are asked to roll the boulder down the hill it wouldn’t be much work because the hill is basically doing all the work For you. Hope this Helps:)
The head of a pin is 1.5 × 10-3 m in diameter. If 1.136 × 107 atoms of oxygen can fit across the head of a pin, what is the atomic radius of oxygen?
About five million million hydrogen atoms could fit. Some factors would affect that number like the area of the head and the size of atoms (as well as attractions between atoms). Some atoms are larger than others.
If 1.136 × 10⁷ atoms of oxygen can fit across the head of a pin whose diameter is 1.5 × 10⁻³ m, the atomic radius of oxygen would be 6.60 × 10⁻¹¹ m.
The head of a pin is 1.5 × 10⁻³ m in diameter. If 1.136 × 10⁷ atoms of oxygen can fit across the head of a pin, the diameter of each oxygen atom would be:
[tex]\frac{1.5 \times 10^{-3}m }{1.136 \times 10^{7}atom} = 1.32 \times 10^{-10}m/atom[/tex]
The atomic radius of oxygen would be half of its diameter.
[tex]\frac{1.32 \times 10^{-10} m}{2} = 6.60 \times 10^{-11} m[/tex]
If 1.136 × 10⁷ atoms of oxygen can fit across the head of a pin whose diameter is 1.5 × 10⁻³ m, the atomic radius of oxygen would be 6.60 × 10⁻¹¹ m.
Learn more: https://brainly.com/question/24526544
is nonflammable a physical or chemical property
The table shows four samples of carbon dioxide and the temperature of the water that they were dissolved in. Which of the samples most likely had the lowest solubility? I know the answer is sample one (78) but i can't find the right words to explain my answer.
Answer:
Sample 1 = 78°
Explanation:
As per the question, while testing the solubility of a solution comprising of water and carbon dioxide, sample 1 is likely to have the lowest solubility with the temperature of the water being 78°, the maximum. The reason for this result is that the 'solubility of carbon dioxide in the water' falls with an increase in the temperature due to the increase in kinetic energy which will enhance the motion between the molecules and allow them to escape.' Thus, the water with maximum temperature will have the lowest solubility. Hence, sample 1 is the correct answer.
What is a property in Science
•how much space an object takes up
•something that changes all the time
•a characteristic or a quality of an object or substance
• a spoon
Answer:
dhsjsbdjdnxjdjdbrbdnñxndndndndjdndndndbf it's b
Please help me with this question.
Answer:
12?
Explanation:
Answer:
8
Explanation:
haploid is half
ANSWER PLEASE ..Which property of an element would be MOST helpful in determining its column in
the periodic table?
The column number of an element in the periodic table is generally determined on the basis of the number of valence electrons. The elements in the same column have similar chemical properties.
What are valence electrons?The electrons present in the outermost shell of an atom which take part in chemical reactions are called the valence electrons. These electrons are responsible for the interaction between the atoms and the formation of chemical bonds.
The valence electrons of an atom also gives us an idea about the chemical properties of elements like valency, the number of unpaired electrons present, etc. The column number of an element is mainly determined on the basis of number of valence electrons.
The elements are placed in vertical columns in the periodic table. There are 2 electrons in the outermost shell of Alkaline earth metals. So they belong to second column.
Thus it is the valence electron which determines the column number.
To know more about valence electrons, visit;
https://brainly.com/question/28977387
#SPJ6
What is the difference between a continuous spectrum with an emission line spectrum?
Answer: A Continuous spectrum is a spectrum that has all wavelengths with no gaps over a wide range. An Emission spectrum is when an electron in an excited state moves to a lower energy level, it emits a certain amount of energy as photons.
I found this information off of a site called “socratic.org.” I hope i could help!
Give 5 examples of branches of science, then give an example of situations that apply the use of it in daily activities. Example: PHYSICS - Turning the light on and off.
Answer:
See explanation
Explanation:
Biology- digestion of food materials
Chemistry- dissolving salt in water
Astronomy - observing day and night
Physics - watching a television
Geography - observing weather changes during the day
what number and types of atoms occur in a formula unit of CaN2O6
Answer:
One calcium, two nitrogen, and six oxygen
Explanation:
How should the baking of a pizza be categorized? A) as an exothermic process because the dough releases heat B) as an endothermic process because the dough releases heat C) as an exothermic process because the dough absorbs heat D) as an endothermic process because the dough absorbs heat
Answer:
D
Explanation:
as an endothermic process because the dough absorbs heat
The baking of a pizza be categorized as an endothermic process because the dough absorbs heat.
What is an Endothermic reaction?This is the type pf reaction in which heat is absorbed from the surroundings in a reaction.
During baking, the oven which is the surrounding is usually hot which brings about the dough absorbing the heat. This depicts an endothermic process and makes option D the most appropriate choice.
Read more about Endothermic reaction here https://brainly.com/question/6506846
Plsss help me now pls plss its a false and true questions
Answer:
to the atomic number one, is true
Which statement accurately describes the chemical symbol of an element?
O The chemical symbol is always a single letter.
O The chemical symbol always starts with the same letter as the name of the element.
O The chemical symbol always begins with a capital letter.
OThe chemical symbol can be shared by more than one element.
Answer:
The chemical symbol always begins with a capital letter.
Explanation:
Answer:
c
Explanation:
The chemical symbol of an element always starts with an chemical letter so here the answer is that the chemical symbol always begins with a capital letter.
It can be seen in the different elements chemical symbol .
For example, Tin is having chemical symbol as Sn while lead is having chemical symbol as Pb.
In both these elements, the chemical symbol starts with a capital letter but none of these have their symbol starts with same letter as their name.