Answer:
They have completely filled outermost shell
Explanation:
The noble gases are the rarest and occur in trace amounts in the atmosphere because they have completely filled outermost and this makes them unreactive with other elements.
Elements become abundant as they combine with other species to form compounds.
Noble gases on the other hand have a high level of stability and do not readily combine with other species.
Some of these gases are :
Helium
Neon
Argon
Krypton
Xenon
Radon
They have very high ionization energy and very low electron affinity and so will not readily react.
HELPP PLEASE
Isotopes have different number of........... *
Protons
Electrons
Neutrons
Protons and Neutrons
Answer:
neutrons. they have the number of protons and electrons
Mr. Bullis wants to know if he gives teachers candy, it will make them smile more. He gives half the teachers candy and the other half get nothing. He then records the number of times the teachers smiled.
Experimental Group:
Control Group:
Answer:
the experimental group would be the teachers who recieved the candy
control group would be the teachers who dont get any candy
Explanation:
experimental group is the group that receives the test variable being tested in this case the variable being the candy
and the control group is the group who doesn't receive the variable
purpose of having a control is to rule out other factors which may influence the results of an experiment.
Water is the ideal medium to have within our bodies BECAUSE it facilitates chemical reactions. a Both the assertion and the reason are incorrect. b The assertion is incorrect, but the reason is correct. c The assertion is correct, but the reason is incorrect. d The assertion and the reason are both correct, but the reason is invalid. e The assertion and the reason are both correct, and the reason is valid.
Answer:
The answer is D
Explanation:
Pls Mark Brainliest
Define Each Piece of the Microscope
Describe What Each Microscope Lens Does
Describe How The Microscope Magnification Lens Works
1) Body tube (Head): The body tube connects the eyepiece to the objective lenses. Arm: The arm connects the body tube to the base of the microscope. Coarse adjustment: Brings the specimen into general focus. Fine adjustment: Fine tunes the focus and increases the detail of the specimen.
2)Microscopes are made up of lenses for magnification, each with their own magnification powers. Depending on the type of lens, it will magnify the specimen according to its focal strength.
3)In simple magnification, light from an object passes through a biconvex lens and is bent (refracted) towards your eye. ... The eyepiece lens usually magnifies 10x, and a typical objective lens magnifies 40x. (Microscopes usually come with a set of objective lenses that can be interchanged to vary the magnification.)
11) Identify the number of elements and the number of atoms present in the chemical formula. NaHCO ²
4; 6
5; 6
4,5
3; 5
Answer:
4;6
Explanation:
because there are four elements
What are the two general properties that define matter?
Answer:
Matter can be defined or described as anything that takes up space, and it is composed of miniscule particles called atoms. It must display the two properties of mass and volume.
Hope that helped it it did please give me brainiest Thanks <333 :3
explain how to balance the chemical equation, KClO3 ⟶ KCl + O2 and include all steps
The balance of chemical equation : 2KClO₃ ⟶ 2KCl + 3O₂
Further explanationEqualization (balance) of chemical reactions can be done using variables. Steps in equalizing the reaction equation:
1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c, etc. 2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index (subscript) between reactant and product 3. Select the coefficient of the substance with the most complex chemical formula equal to 1Reaction
[tex]\tt KClO_3\Rightarrow KCl+O_2[/tex]
1. Coefficient
KClO₃ ⟶ aKCl + bO₂
2. Equation
K ⇒ left =1, right=a ⇒a=1
Cl⇒ left =1, right=a ⇒a=1
O ⇒ left = 3, right = 2b ⇒3=2b, b = 1.5
The equation turns into :
KClO₃ ⟶ KCl + 1.5O₂
multiplied by 2
2KClO₃ ⟶ 2KCl + 3O₂
Question 4 (4 points)
Special bonds formed because of electrostatic interaction between molecules are called
A.intermolecular forces
B. intramolecular forces
C.permanent forces
D.magnetic forces
Answer:
A. intermolecular forces.
HELP ASAP
Which of the following is NOT a factor in conduction?
A. Temperature difference
B. Fluid flow
C. Surface Contact
D. Cross sectional area
B:Fluid Flow because fluid flow is how convection heat is transfered
Explain the difference between potential energy and kinetic energy.
Sentence Starters
"Potential Energy is. . "
"Kinetic Energy is. . "
"The difference between potential energy and kinetic energy is. . ."
Answer:
Potential energy is the stored energy in an object or thing, while kinetic energy is the energy which an object contains because of a particular motion.
Explanation:
Potential energy is energy that is stored for example a wind up toy, it has energy but in order for you to get kinetic energy, it has to move. So kinetic energy is moving energy.
The difference is that potential is stored and kinetic is moving energy.
helpppp
Chemical bond formation might take place due to the interaction between a(n) _______ and an anion
A.magnetic
B.valence
C.electrostatic
D.cation
fghgfgfgfftftftft ttcc
Answer:
fghgfgfgftftftftftft ttcc
tehee
Explanation:
How do clastic sedimentary rocks form?
Solid chemicals in water harden and form rocks.
Fragments of rock are squeezed and cemented together.
Lava cools and hardens into rock.
Plant and animal remains are squeezed and cemented together.
Plz help I give the brainlyest
Answer: solid chemicals in waterharden and form rocks
Explanation:
Answer:
Fragments of rock are squeezed and cemented together.
Explanation:
I took the test and got the answer below:
which in the following best describe carbon
a high density
b. ductile
c. Conductive
d. brittle
Which best explains why making a pancake from batter is an example of a chemical change?
The pancake that forms is a different state of matter.
The change from batter to pancake can be reversed.
A new substance forms when the batter is cooked.
The batter changes shape when it is cooked.
Answer:
the correct answer is C. A new substance forms when the batter is cooked
Explanation:
I got it right on edge 2021. Hope this helps
What are the two main types of cells, and how do we classify them?
Answer:
eukaryotic, which contain a nucleus, and prokaryotic, which do not. Prokaryotes are single-celled organisms, while eukaryotes can be either single-celled or multicellular.
Explanation:
Answer:
Eukaryotic and prokaryotic
Explanation:
Eukaryotic cells contain a nucleus and prokaryotic cells do not
Why do acids and bases neutralize eachother?
Answer:
Explanation:
When an acid and a base are placed together, they react to neutralize the acid and base properties, producing a salt. The H(+) cation of the acid combines with the OH(-) anion of the base to form water. The compound formed by the cation of the base and the anion of the acid is called a salt.
Contains elements carbon, hydrogen and oxygen, the empirical formula of butanedion is C2H3O and its molar mass is 86.09% find its empirical formula
Answer:
Molecular formula = C₄H₆O₂
Explanation:
Given data:
Empirical formula of butanedion = C₂H₃O
Molar mass of butanedion = 86.09 g/mol
Molecular formula butanedion = ?
Solution:
Formula:
Molecular formula = n(empirical formula)
n = molar mass of compound / empirical formula mass
empirical formula mass = 2×12 +1.008×3 +1×16 = 43.024
n = 86.09 / 43.024
n = 2
Molecular formula = n (empirical formula)
Molecular formula = 2 (C₂H₃O)
Molecular formula = C₄H₆O₂
Which of the following pairs of elements belong to the same period?
Answer:
He and Ar
Explanation:
What colors are the fireworks in the photo? How do you
think the matter and energy of fireworks of different colors are similar and
different?
Answer:
Shortly after, the electron will fall back down to a lower energy level, releasing energy in the form of light. Therein lies the key to colorful fireworks!
The matter and energy of fireworks simply rely on the flow of electrons from the ground stage to the excitatory stage.
What is Matter?Matter may be defined as any sort of substance that is constructed of numerous types of particles that occupy physical space and possess inertia. In simple words, matter may be characterized as anything which occupies space and has mass.
When the electrons move from the ground stage to the excitatory stage, they require a significant amount of energy in any form. But when they fall back to the ground stage from the excitatory stage, they liberates energy.
The same principle is applied in the colorful observation of fireworks. The stored energy is released and different colors of fireworks become visible.
Therefore, the matter and energy of fireworks simply rely on the flow of electrons from the ground stage to the excitatory stage and vice-versa.
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AgF (aq) + KNO3 (aq) →
Answer:
AgF (aq) + KNO₃ (aq) → AgNO₃(aq) + KF(aq)
Explanation:
AgF (aq) + KNO₃ (aq) →
The products from the equation above can be obtained as follow:
1. AgF and KNO₃ will dissociate in solution as shown below:
AgF (aq) —> Ag⁺(aq) + F¯(aq)
KNO₃ (aq) → K⁺(aq) + NO₃¯(aq)
2. A double displacement reaction will occur between AgF and KNO₃ as illustrated below:
AgF (aq) + KNO₃ (aq) →
Ag⁺(aq) + F¯(aq) + K⁺(aq) + NO₃¯(aq) → Ag⁺NO₃¯(aq) + K⁺F¯(aq)
AgF (aq) + KNO₃ (aq) → AgNO₃(aq) + KF(aq)
A careful observation of the above equation shows that the equation is balanced.
The element found in Group 13, Period 2 is ______ a- Al b- Be c- B d- Mg
How do homes lose thermal energy?
I need TWO reasons on why we want to reduce the thermal loose.
Answer:
Poorly insulated attics, windows not being insulated in the winter
Explanation:
One reason is so we do not get cold in the winter and the reason we have a home is to protect us from the weather or put a shelter above us. Second reason is so we don't get hypothermia in the winter time.
3. Except for the bolt, note the difference between the calculated volumes and the volume
found by the displacement method. Which method is more accurate? Why?
Answer:
Yes Because the calculated volume is more accurate because you are able to measure the smaller dimensions.
~Apex lab
tectonic plates move to
Answer:
I don't really understand, but here is my answer:
Tectonics plates can move back and forth, side to side, and into each other which causes earthquakes.
Hope this helps!
Sky
The metric unit of force is the Newton (N) , which is kg⋅m/s2 .
Convert 10 kg⋅cm/s2 to Newtons.
OPTIONS:
A. 1×10−1 N
B. 1×10−2 N
C. 1×10−5 N
D. 1×10−6 N
Answer:
1×10^-1 N
I took the quiz
Answer:
A
Explanation:
I just took the test.
What happens if an organism cannot carry out its life function?
Answer:
organisms cannot stay with out getting nutrients as they will not be able to repair them selves or produce energy.
Explanation:
(PLS HELP will mark brainliest!) Compare and contrast the alkali metals and the alkaline earth metals. Discuss their physical and chemical properties, their magnetic properties, and their electron configurations.
Answer:
I have a picture from my excerpt that basically answers all of that!
Hope it helps!
Explanation:
The attachment
The alkali metals and alkaline earth metals has different physical and chemical properties due to difference in their valence electrons.
Comparison of physical and chemical properties of alkali metals and the alkaline earth metals. Alkali Metals Alkaline earth metals·Electronic [Noble gas]ns1 [Noble gas]ns2
configuration
·Reactivity Comparatively more reactive Comparatively less
reactive
·Hardness Soft and can be cut by sharp Comparatively harder
knife
·Valency One valence electron Two valence electron
·Ionic charge +1 +2
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Autism is a disability that results from a disorder in the central nervous system. It has been speculated that the increasing number of cases of autism in recent years is due to the increase in the number of vaccinations given to young children. What might be another possible explanation for this phenomenon?
Answer:
Explanation:
As described in the question, autism is a disability that arises from a disorder in the central nervous system which is actually characterized by abnormality in the brain structure and then function. Autism is known for symptoms such as challenges with communication and interaction and some obsessive behaviors. While there is generally no known scientific cause for autism but trends have suggested that vaccination in young children causes autism.
However, genes could also be involved in this phenomenon because there have been reports of unusual genetic sequence in children that have autism. Hence, there is a possibility that vaccination actually triggers this genetic sequence which is then expressed as autism in the children.
Please note this isn't a scientific fact and just a possibility as requested in the question.
A 2.3 kg object has 15 ) of kinetic energy. Calculate its speed.
O A. 0.12 m/s
OB. 1.1 m/s
O c. 2.4 m/s
OD. 3.6 m/s
Answer:
The answer is option DExplanation:
To find the speed given the kinetic energy and mass we use the formula
[tex]v = \sqrt{ \frac{2KE}{m} } \\ [/tex]
where
m is the mass
v is the speed
From the question
KE = 15 J
m = 2.3 kg
We have
[tex]v = \sqrt{ \frac{2 \times 15}{2.3} } = \sqrt{ \frac{30}{2.3} } \\ = 3.61157559...[/tex]
We have the final answer as
3.6 m/sHope this helps you