Answer:
Option B. 28.5 amu
Explanation:
The following data were obtained from the question:
Isotope A:
Mass of A = 28.0 amu
Abundance (A%) = 14.0%
Isotope B:
Mass of B = 29.0 amu
Abundance (B%) = 66.0%
Isotope C:
Mass of C = 27.4 amu
Abundance (C%) = 20.0%
Atomic mass of element X =.?
The atomic mass of element X can be obtained by using the following formula:
Atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100]
Atomic mass of Element X = [(28 × 14)/100] + [(29 × 66)/100] + [(27.4 × 20)/100]
= 3.92 + 19.14 + 5.48
= 28.54 ≈ 28.5 amu
Therefore, the atomic mass of Element X is 28.5 amu
2. Which set of symbols represents isotopes of the same element?
Set 2
Set 1
80
м
38
133
81
M
38
83
M
38
132
Q
55
Q
133
Q
54
55
Set 4
Set 3
50
L
19
50
L
20
50
L
21
91
J
43
92
J
42
93
J
42
The set of symbols that represents isotopes has been 84/38 M 86/38 M 87/38 M. Thus, option D is correct.
The isotopes are the elements with same atomic number, but different mass number. In an isotope [tex]\rm ^a_bX[/tex], a has been the atomic mass, and b has been the atomic number.
The isotopes will have same value for b, while different values for a.
In the following given sets:
A. 50/19 L 50/20 L 50/21 L
It has same number of mass the atomic number has been different. Thus, the set not represents isotopes.
B. 138/59 Q 133/55 Q 133/54 Q
The given elements, has different atomic number, and different mass number. Thus the set did not represents the isotopes.
C. 91/42 J 92/42 J 93/40 J
The given elements, has different atomic number, and different mass number.Thus the set did not represents the isotopes.
D. 84/38 M 86/38 M 87/38 M
The given set has same atomic number with different mass number.Thus, the set has been the representation of isotopes.
The set of symbols that represents isotopes has been 84/38 M 86/38 M 87/38 M. Thus, option D is correct.
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The top diagram represents a mixture of S atoms and O2 molecules in a closed container.
Which symbolic notation best represents the molecule in the bottom picture?
A) S2O6
B) SO3
C) 2 SO3
D) 2 S and 6 O
Answer:
S2O6 best represents the bottom picture. When atoms are bonded in a molecule, the number of them is represented as a subscript in a chemical formula.
Explanation:
The symbolic notation that best represents the molecule in the bottom picture is S2O6.
Sulfur is a chemical element that has the symbol S. It also has the atomic number of 16. It should be noted that sulfur is known as the 10th most abundant element that we've in the universe.It should be noted that S2O6 is the chemical formula for Disulfur Hexoxide. Di simply indicates that there are two sulfur atoms. Hexa indicates that there are six oxygen atoms.In conclusion, the symbolic notation best represents the molecule at the bottom is S2O6.
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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:
is nonflammable a physical or chemical property
Which answer below correctly identifies the type of change and the explanation for the boiling of water?
physical change because even though the change caused the temperature of the water to increase,
the water's physical properties remained exactly the same
physical change because even though gas formation was observed, the water was undergoing a
state change, which means that its original properties are preserved
chemical change because gas formation was observed, which indicated that the water was
transformed into a different substance
0 chemical change because a temperature change was observed, which indicated that the water was
transformed into a different substance
Answer: physical change
Explanation:
as the water heats up the atoms begin to move faster changing the physical form
25 PTS!
11. The metric prefix for 1/1000 is:
a) centi
b) milli
c) micro
d) kilo
What is a particle with one positive charge called?
Answer:
Proton: A positively charged particle found in the nucleus of an atom. A proton contributes one atomic mass unit to the total atomic weight of an atom.
Explanation:
Answer:
A proton
Explanation:
A proton is a positive charge found in an atom
Which ion has a charge of 2-?
Ion A: 8 Protons,10 Neutrons,10 Electrons
Ion E:9 Protons,10 Neutrons,10 Electrons
Ion G:11 Protons,12 Neutrons,10 Electrons
Ion J:12 Protons,12 Neutrons,10 Electrobs
Answer:
A
Explanation:
More electrons than protons, thus giving the atom an overall charge of -2
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10. When 5.1 x 10^-3 is subtracted from 1.0051 the difference is:
a) 1.0000
b) 1.000
c) 1.00
d) 1.0
To find the difference between 1.0051 and 5.1 x 10⁻³, subtract the second number from the first number from its decimal form.Thus, the correct option is A.
First, convert 5.1 x 10⁻³to decimal form:
5.1 x 10⁻³ = 0.0051 is the decimal form of the given number 5.1 x 10⁻³.
Then subtract the 2 numbers that is,0.0051 from 1.0051:
1.0051 - 0.0051 = 1.0000 which has 4 digits after the decimal.
So, the difference between the two numbers 1.0051 and 5.1 x 10⁻³ is 1.0000.
Thus,the correct option is a) 1.0000 which is the difference between 1.0051 and 5.1 x 10⁻³.
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What words do we use to talk about a column of the periodic table? (2 CORRECT ANSWERS) Period Group Family Atom Nucleus
When talking about a column of the periodic table the word we use is (B). Group
Meaning of a group in a periodic tableA group in a periodic table is a column in the periodic table of chemical elements.
In a group, all the chemical elements have similar properties which include; atoms of the same vacancy in valence and valence electron.
Groups have similar physical and chemical properties.
Groups in a periodic table are numbered from number 1 to number 8, and it is numbered from the left to the right side of the periodic table.
In conclusion, When talking about a column of the periodic table the word we use is Group
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60 N net force is applied to a 12 KG box. What is the acceleration of the box?
Answer:
The answer is
5 m/s²Explanation:
The acceleration of an object given it's mass and it's net force can be found by using the formula
[tex]acceleration = \frac{force}{mass} \\ [/tex]
From the question
force = 60 N
mass = 12 kg
So we have
[tex]acceleration = \frac{60}{12} \\ [/tex]
We have the final answer as
5 m/s²Hope this helps you
a metal rod weighing 123 g with a temperature of 100 c is placed in a 75 ml of water at 25 c if the final temperature of the metal and water is 29 c what is the specific heat capacity of the metal? assume the density of water is 1.0 g/ml and specific heat capacity of water is 4.184 j/g c
Answer:
What grade r u in
Explanation:
Just bcauz Ima coo dud and 5=5 and 1=1
Write the net ionic equation for the acid-base reaction of hydrochloric acid with phosphine. (Include states-of-matter under the given conditions in your answer.)
The net ionic equation for the acid-base reaction of hydrochloric acid with phosphine is PH3(aq) + H⁺(aq) → PH⁺₄ (aq)
What is a Chemical reaction?A chemical reaction shows us how substances interact which brings about changes in the composition of the reactants. Two types of Chemical reactions includes:
the net ionic equation balanced chemical equation.The net ionic equation of a chemical equation tells us only elements and ions directly involved in the chemical reaction.
Now for the reaction of hydrochloric acid, HCl with phosphine, PH3,
First write the aqueous substances in their ionic components
PH3(aq) + HCl(aq)→ PH4Cl(aq)
PH3(aq) + H⁺(aq) +Cl⁻(aq) → PH⁺₄ (aq) + Cl⁻(aq)
Then we remove the ions that do not take part in the reaction, Cl⁻(aq)
So we are left with
PH₃(aq) + H⁺(aq) → PH⁺₄ (aq)
Therefore, the net ionic equation for the reaction of hydrochloric acid with phosphine is PH₃(aq) + H⁺(aq) → PH⁺₄ (aq)
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There are a equal number of protons and electeons in natural atoms True or false
Answer:
false
Explanation:
There are a equal number of protons and electrons in neutral atoms.
Using a calculator, what is the density of an unknown object with a mass
of 550 g and a volume of 10 cm3?
Answer and work pictured below:
please, please, please help! this assignment is due in a few mins and idk what to do. I will mark the first/best answer brainliest! Why do substances exist as a solid, a liquid, or a gas?
Answer:
Explanation:
The atoms and molecules in gases are much more spread out than in solids or liquids. They vibrate and move freely at high speeds. A gas will fill any container, but if the container is not sealed, the gas will escape. Gas can be compressed much more easily than a liquid or solid
When moving down a Column in the periodic table what stays the same ?
Answer:
Explanation:
When we go down in a column , we are going down in a period . In going down , one additional orbit go on adding to the atom . But the total number of electrons in the outermost orbit which is also called valence electron remains the same .
For example , when we go down in the first group A , the outermost orbit go on changing like 1 s¹ , 2 s¹ , 3 s¹ . 4 s ¹ etc which represents hydrogen , lithium . sodium , potassium etc.
So we see that , it is number of valance electrons that remains constant.
Explain how NOTHING is ZERO, but ZERO is more than NOTHING?
Answer:
Nothing can be zero, but zero isn't nothing. If someone asks you if you have money and you say "I've got nothing!" when you actually don't have a cent, then you have zero money. However, zero is a number, so it itself is something, therefore more than nothing. So technically, you do have something.
When zero is on a number line, you could classify it as nothing, but it is the number between 1 and -1. Hypothetically speaking, if you took the zero away, wouldn't the number line be the same?
Zero isn't positive or negative. The number zero on a graph, or in a coordinate can tell you where something is. Zero can be a word to describe if something is existent, or non-existent.
Okay, my brain hurts.
Keeping in mind the rules for significant digits, what is the product of 0.8954 m and 2.98 m?
Answer: 3.240576
Explanation:
There are various ways of doing multiplication this is one of them
The wording "keep in mind the rules for significant digits" implies that we are to use these to show where the decimal place goes by approximating the answer. Then conducting the exact calculation.
Consider 0.8 as 8
×
1
10
3
×
8
×
1
10
=
2.4
So the solution is some where a bit above 2.4
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Lets just use the numbers
Multiply both 0.8439 and 3.84 by 1000 to get rid of the decimal place. This makes thing more straight forward. So we end up with:
8439
×
38400
Split up the 38400 into 30000+ 8000 + 400
30000
×
8439
=
253170000
.
8000
×
8439
=
.
67512000
.
.
400
×
8439
=
.
.
3375600
−−−−−−−−−
←
Add
.
324057600
By our approximation we are expecting the form of
2.4
+
small amount
So the answer is
3.240576
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Check by calculator:
0.8439
×
3.84
=
3.240576
The teacher was not in the room yet. Randy began opening containers of chemicals, touching them with his hands. His cheek itches so he rubbed it. Explain how Randy was not acting safety in the the laboratory.
I know the answer I just don’t know how to word it. Please help. Due by 11:59 tonight
Answer:
Randy went into the classroom without the teacher being present. He opened containers of chemicals without the teacher's consent. Randy is making contact with the chemicals on his skin.
I hope this helps! I haven't done lab science in a while so I'm trying to remember the safety precautions.
Randy went into the classroom without the teacher being present and opened containers of chemical, making contact with chemicals on skin leads to skin reaction.
So Randy should follow the lab safety rules while entering into lab.
What are the important lab safety rules?After entering lab wear apron and gloves along with safety goggles if working with any hazardous or infectious substance.
Fully aware about the hazards of the materials, properly trained to handle lab equipment, chemicals should be adequately labelled.
Taste or smell chemicals are prohibited, never pour already stored chemicals, chemical hygiene plan should be developed for specific hazards.
Avoid to adopt un-tested and unauthorized experimentation, Clean up all chemical spill, Laboratory induction should be carried out .
Avoid storage of any edible items in the refrigerator along with lab chemicals and specimens, clean the work station after completing experiment and sterilization should be done before starting experiment.
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2. Jessica did an investigation about the states of matter. As part of the
investigation, Jessica wanted to change a liquid into a solid. What must she do to
bring about this change in state?
Jessica had to freeze liquid into solid.
What is the matter?
The matter is anything that occupies space. There are three states of matter: Solid, liquid, and gas.
The process in which a solid turned into liquid is called melting. When the liquid turns into solid is called freezing. The temperature of freezing liquid remains constant. The factors which affect the freezing point of object:
If the intermolecular force of molecules are relatively strong, the freezing point of object will be relatively high.If the intermolecular force of molecules are relatively weak, the freezing point of object will be relatively low.When water turns into ice that process is called freezing. When water turns into water vapor is called boiling. When gas turns into a solid that process is called condensation.
Therefore, Jessica had to freeze liquid into solid.
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Carbon dioxide in the air dissolves in rain as it falls to Earth. This results in the formation of carbonic acid, a weak acid. Explain why the student blowing into test tube B is similar to the process of forming slightly acidic rain.
Explanation:
Acid rain :
Acid rain is also known as acid deposition. It may be defined as a form of precipitation of the acidic components like nitric acid or sulfuric acid and fall to the earth surface from the atmosphere.
In the context, the student doing the experiment blows air in to the test tube B containing chalk dipped in water is similar to the process of acidic rain as it results in the formation of a weak carbonic acid when the carbon dioxide present in the air mixes with the chalk in the form of calcium carbonate.
Carbon dioxide reacts with water to from carbonic acid which dissociated into hydrogen ion and hydrogen carbonate ion.
True or false: Only liquids can be described as fluids. I NEEED HELPP NOWWW
Answer:
Explanation:
no, as it can also be used to describe a gas- a fluid includes liquids, gases and plasms
Completely classify jet fuel.
Element
Heterogeneous Mixture
Pure Substance
Compound
Homogeneous Mixture
Mixture
Answer:
Mixture
Explanation:
A mixture is defined as a material formed from the combination of two or more different substances.
Jet fuel is a mixture of hydrocarbons including crude oil petroleum and kerosene or gasoline. Jet fuels are made by the process of refining and blending of different petroleum and kerosene.
Hence, the correct option is "Mixture".
Do you find the cell membrane in Animal Cells, Plant Cells or Both?
Answer:Both have cell membranes
both. Both plants and animals have cell membranes
Gases deviate from tidal gas behavior because their particles:
Answer:
Explanation:
At low temperatures or high pressures, real gases deviate significantly from ideal gas behavior.
The kinetic theory assumes that gas particles occupy a negligible fraction of the total volume of the gas. It also assumes that the force of attraction between gas molecules is zero.
I hoped I helped you! :)
which of the following is a scientific law?
climate changing a
nodvnfosdjfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfv
its a
Answer:
Climate change
is magnesium a pure substance????
Which of the following is an example of a chemical property?
o corrosion
o boiling point
o ability to dissolve
o melting point
Answer:
Corrosion is your answer
Answer:
▷The answer would be
▶︎corrosion
Explanation:
~corrosion~ is a natural process that converts a refined metal into a more chemically stable form such as oxide, hydroxide, or sulfide. It is the gradual destruction of materials by chemical and/or electrochemical reaction with their environment
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Select the option(s) that apply to the item listed: Sugar. *
element
compound
both
Answer:
Sugar is a element
Explanation: