Answers
Answer:
The pointer pointing to the grey and white balls are either proton or nuetron i van't really tell cause their grey and white.
The whole clster of balls is the Nucleus
The black balls on the lines are electrons
And the lines are the energy level
Explanation:
Related Questions
The Earth's _____ provides protection from meteorite impacts by causing them to _____.
please leave a simple answer
Answers
Answer:
atmosphere, break up
Explanation:
Answer:
Atmosphere, break up
Explanation:
Two substances in a mixture differ in density and particle size. theses properties can be used to
Answers
Answer:
option 1. Two substances in a mixture differ in density and particle size. These properties can be used to separate the substances. These properties can be manipulated in order to have a better separation between the two substances.
Explanation:
Answer:
Two substances in a mixture differ in density and particle size. These properties can be used to separate both of them using the separating funnel or using filtration (filter paper).
Explanation:
Since their densities are different, one substance should float above the other in the mixture which allows for the separating funnel to let the substance sinking below (with the heavier density) to flow out first before changing the beaker to let the lighter substance flow out.
The substance with a bigger particle size would not be able to pass through the filter paper unlike the substance with the smaller particle size as the filter paper's pores is not big enough for it to pass through, separating both substances (with one on the paper and the other outside the filter paper, preferably in the beaker placed below the paper).
Select all that apply.
Exposure to excessive ultraviolet radiation can be harmful to your _____.
body
skin
breathing
health
Answers
✌Hope this help ✌
Answer:
body skin health
Explanation:
A block is pulled 0.90 m to the right in 3.75 s.
What is the block’s average speed to the nearest hundredth of a m/s?
Answers
Answer:
0.36 m/s
Explanation:
im in 8th grade in honors science and i think, since u have distance and time you have to divide distance by time
What is the huge grouping of stars that rotate around a center of which the Sun and the solar are a part.
Answers
A model of the helium atom is shown below. Select all of the neutrons in the picture.
Answers
Given is a helium atom. Inside the nucleus , there are 2 protons denoted by blue colour and the other two are neutrons denoted by green colour
Chemical element helium has the atomic number 2 and the symbol He. It is the first member of the noble gas group in the periodic table and is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas.Neutrons have no charge, protons have a positive charge, and electrons have a negative charge.One proton's positive charge and one electron's negative charge are equal.While electrons have essentially negligible mass, protons and neutrons each have a mass of 1.While electrons quickly revolve around the nucleus in fixed circular orbits, protons and neutrons are present collectively in the nucleus at its center.The nucleus, located in the heart of the atom, is home to protons and neutrons, which are heavier than electrons.Learn more about helium here:
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When two continental plates of similar
densities collide,
A. they remain level since densities in both plates are equal.
B. they both push back down into the mantle
C. one plate rides over the other one and forms a trench
D.they buckle upward and form mountains
Answers
Answer:
D. They buckle upward and form mountains.
Explanation:
When two plates (either oceanic or terrestrial) converge and they are of similar density then they will crash into each other and form mountains. A great example of this is when India crashed into the Asian continent and the Himalayas were formed.
A 1.25 g sample of aluminum is reacted with 3.28 g of copper (II) sulfate. What is the limiting reactant?
2Al(s) + 3CuSO4(aq) = Al2(SO4)3(aq) + 3Cu(s)
Select one:
a. Copper
b. Aluminum sulfate
c. Aluminum
d. Copper (II) sulfate
Answers
Answer:
d. Copper (II) sulfate
Explanation:
Given data:
Mass of Al = 1.25 g
Mass of CuSO₄ = 3.28 g
What is limiting reactant = ?
Solution:
Chemical equation:
2Al + 3CuSO₄ → Al₂ (SO₄)₃ + 3Cu
Number of moles of Al:
Number of moles = mass/molar mass
Number of moles = 1.25 g/ 27 g/mol
Number of moles = 0.05 mol
Number of moles of CuSO₄:
Number of moles = mass/molar mass
Number of moles = 3.28 g/ 159.6 g/mol
Number of moles = 0.02 mol
now we will compare the moles of reactant with product.
Al : Al₂ (SO₄)₃
2 : 1
0.05 : 1/2×0.05=0.025 mol
Al : Cu
2 : 3
0.05 : 3/2×0.05 = 0.075 mol
CuSO₄ : Al₂ (SO₄)₃
3 : 1
0.02 : 1/3×0.02=0.007 mol
CuSO₄ : Cu
3 : 3
0.02 : 0.02
Less number of moles of reactants are produced by CuSO₄ thus it will act as limiting reactant.
A student is asked to determine the chemical formula for the compound Barium
chloride. When writing the chemical formula, what question will the student need to
ask to determine the correct formula?
What period does barium belong to?
Are barium and chlorine a metal and nonmetal?
What is the state of matter of each element that comprises the final formula?
What are the charges of each atom?
Answers
Answer:
Are barium and chlorine a metal and nonmetal?
Explanation:
I had the same question, and my class reviewed the test and this was the answer to this question.
Margarita set up three vials on a hot plate. She poured the same amount of
liquid into each of the vials, and then she turned on the hot plate. Which event
could be a significant source of error in her experiment?
Answers
Answer: Since the vials are filled the same, and are placed on the same hot pad, all the water will evaporate at the same time
Explanation:
The source of error in the experiment is the vials being filled the same, and placed on the same hot pad, all the water evaporating at the same time .
What are errors?Errors in chemical analysis result when there is a difference between observed value and the true value.If the magnitude of errors is large , it results in decrease in accuracy, reproducibility, and precision.
There are three types of errors:1) random error 2) systematic error 3) human error.The cause of random errors are difficult to quantify while the human errors can be minimized by taking a range of readings to reduce the error.
Errors while measuring boiling point may be human errors while noting down the boiling temperature or instrumental or systematic error if there is a fault in the thermometer.
Learn more about error,here:
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does SiF4 have polar covalent bonds?
Answers
Answer:
SiF4 is not a polar covalent bond.
Explanation:
SiF4 is a nonpolar molecule because the fluorine's are arranged around the central silicon atom in a tetrahedral molecule with all of the regions of negative charge cancelling each other out.
How much radium-226 will remain from a 20 gram sample after 4800 years?
Answers
Answer:
2.5 g mass of Ra-226 will remain after 4800 years.
Explanation:
Given data:
Mass of Ra-226 = 20 g
Sample remain after 4800 years = ?
Solution:
Half life of Ra-226 = 1600 years
Number of half lives passed = T elapsed / half life
Number of half lives passed = 4800 year / 1600 year
Number of half lives passed = 3
At time zero = 20 g
At first half life = 20 g/2 = 10 g
At 2nd half life = 10 g/2 = 5 g
At 3rd half life = 5 g/2 = 2.5 g
Thus, 2.5 g mass of Ra-226 will remain after 4800 years.
AB + energy→ A +B
23.
The general equation shown is a reaction that is an
a. exothermic decomposition
b. endothermic decomposition
c. endothermic synthesis
d. exothermic synthesis
Answers
Answer:
b. endothermic decomposition
Explanation:
Decomposition reaction:
It is the reaction in which one reactant is break down into two or more product.
AB → A + B
Synthesis reaction:
It is the reaction in which two or more simple substance react to give one or more complex product.
A + B → AB
Endothermic reactions:
The type of reactions in which energy is absorbed are called endothermic reactions.
In this type of reaction energy needed to break the bond are higher than the energy released during bond formation.
For example:
C + H₂O + 131 kj/mol → CO + H₂
Thus, in given reaction energy is added and AB compound is decomposed to give A and B so this reaction is endothermic decomposition.
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What is one way in which sound and light are alike?
They both travel easily through wood.
They are both types of energy.
They both can travel through outer space.
They both make it easier for you to see what you are doing.
Answers
Answer:
B)They are both types of energy.
Explanation:
Answer:
they both travel easily through wood
Explanation:
i don't want your rbx i just wanna help you:)
As shown by the periodic table, why do the elements potassium and sodium have similar chemical properties?
Answers
This is the answer
The elements potassium and sodium have similar chemical properties because they have the same number of valence electrons and form +1 ions.
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A pure substance is one that_____
a. Has been filtered
b. is an element or compound
c. If found in nature
d. Has been cleaned
Answers
Answer:
gimme points
Explanation:
how does the octet rule predict the stability or reactivity of atoms.
Answers
Answer:
Explanation:
The octet rule allows chemists to predict the placement of electrons around the nucleus (electron orbitals), the identification of electrons added or lost during chemical reactions and the chemical reactivity of atoms based upon their particular electron configuration.
How many molecules of SrCrO4 are in a sample of SrCrO4 0.556 moles?
Answers
Answer:
[tex]3.35*10^{23}\ SrCrO_4\ molecules[/tex]
Explanation:
[tex]We\ are\ given\ that,\\No.\ of\ moles\ of\ SrCrO_4=0.556\\Hence,\\As\ we\ know\ that,\\No.\ of\ particles=Avagadro's\ Constant*No.\ of\ moles\\We\ already\ know\ that\ Avagadro's\ Constant=6.022*10^{23}\\Here,\\No.\ of\ SrCrO_4\ molecules= 6.022*10^{23}*0.556\\Hence,\\No.\ of\ SrCrO_4\ molecules=3.348*10^{23} molecules\ \approx 3.35*10^{23}\ SrCrO_4\ molecules[/tex]
Can someone help me please!
Answers
Answer:
It tells you on the chart I've attached. It's all color coded. :p
Why do covalent compounds tend to be squishy?
Answers
Answer:
Since they're easy to separate, covalent compounds have low melting and boiling points. 2) Covalent compounds are soft and squishy (compared to ionic compounds, anyway). The reason for this is similar to the reason that covalent compounds have low melting and boiling points. When you hit an ionic compound with something, it feels very hard
Explanation:
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PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP
DETERMINE THE MASS NUMBER OF EACH OF THE ISOTOPES OF LITHIUM
Answers
Answer:
not sure about it .I also need an answer
what are the materials made by chemists for use in washing clothes and cooking materials
Answers
Answer:
water
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What math is used to find density?
Answers
Answer:
[tex]\huge\mathtt{{\colorbox{silver}{ANSWER~~~↴}}}[/tex]
Density is the mass of an object divided by its volume. Density often has units of grams per cubic centimeter (g/cm3). Remember, grams is a mass and cubic centimeters is a volume (the same volume as 1 milliliter).
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soap making ingredients list (not harmful chemicals)
Answers
20 oz. coconut oil
10 oz. olive oil
9 oz. distilled water
essential oils
colorants (optional)
dried herbs or flowers (optional)
soap base accordingly
When a chemical reaction takes place, the number of atorns of each element in the reactants
nunber of atorms of each element in the products.
will be dferent from
must be equal to
Answers
Answer:
The law of conservation of matter says that matter cannot be created or destroyed. In chemical equations, the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products
Explanation:
d. what happens when an iron nail is kept in copper sulphate solution?
Answers
Answer:
it changes color from blue to light green.
Explanation:
due to copper iron nail functions
Answer:
give the other person brainlieset plz
Explanation:
The units of a formula mass are
a. amu
b. micrograms
c. moles
d. grams
Answers
Answer:
the units of a formula mass are amu.
The partial symbol for a particular ion is 26M2+ What are the number of electrons contained in one ion
Answers
Answer:
24
Explanation:
26-2=24 because when an atoms loses 2 electrons it gains 2+ charge
What is the relationship between the number of digits and the evolution of the tetrapod?
Answers
Answer:As the tetrapod evolved, the number of digits decreased
Explanation:
Answer: During the evolution of the tetrapod limb, the number and pattern of elements along the proximal–distal axis (running from the shoulder to the fingers) has remained invariant, while the number and pattern of elements along the autopod anterior–posterior axis (thumb to little finger, also designated digi
Explanation:
Why is elemental zinc considered a pure substance?
Select one:
It is a metal.
It is a mixture of different atoms.
All elements are considered pure substances.
It must be created in a lab.
Answers
Answer: C... Because Zinc is made of only one type of atoms.
Explanation: All elements are made of one type of atom. Pure gold is made out of only gold atoms, silver out of only silver atoms, etc.