What does an atomic number represent in an atom?
A) number of electrons
B) number of protons
C) number of protons and neutrons
D) number of neutrons
Answer:
C, number of protons and neutrons
Match each tool on the left with its most likely use on the right by choosing the correct number. ruler scale telescope thermometer microscope 1. Measuring the weight of an apple 2. Studying a distant object 3. Studying a very small object 4. Measuring the length of a book 5. Measuring the temperature of a cup of tea
Answer:
1. Measuring the weight of an apple- scale.
2. Studying a distant object- telescope.
3. Studying a very small object- microscope.
4. Measuring the length of a book- ruler.
5. Measuring the temperature of a cup of tea- thermometer.
Explanation:
1. A scale or measuring scale is used to measure or take the weight of any object. It can be either an analog or digital scale as long as the measurements can be taken from it. So, measuring the weight of an apple can be done on a measuring scale.
2. A telescope is an instrument that is used in scientific, especially in space explorations, to study a distant object in the universe/ sky. It gives a clear image and enables a person to view things closer than they are. So, a telescope can be used to study distant objects.
3. A microscope is used to study very different small objects, such as microbes and other organisms. It enlarges the objects to be viewed and thus, enables them to be studied in detail.
4. A ruler may be used to measure the length of a book. It has indications or marks by which the lengths can be taken.
5. A thermometer is an instrument that is used to measure the temperature of anything, be it a person or even other things such as food and even a cup of tea.
Answer:
Match each tool on the left with its most likely use on the right by choosing the correct number.
4
ruler
1
scale
2
telescope
5
thermometer
3
microscope
Explanation:
The atoms of liquid Mercury are
Answer: close together, moving around one another.
Explanation: to study island answer
hope this helps!!!
Please help lots of points!!! Net ionic equation for aqueous solutions of perchloric acid and barium hydroxide.
Answer:
H⁺(aq) + OH⁻(aq) = H₂O(l)
Explanation:
To find the net ionic equation start by finding the balanced equation.
2HClO₄(aq) + Ba(OH)₂(aq) ⇒ 2H₂O(l) + Ba(ClO₄)₂(aq)
Then put it into the ionic equation.
2H⁺(aq) + 2ClO₄(aq) + Ba²⁺(aq) + 2OH⁻(aq) ⇒ 2H₂O(l) + Ba²⁺(aq) + 2ClO₄(aq)
Remove all the ions that do not change.
2H⁺(aq) + 2OH⁻(aq) ⇒ 2H₂O(l)
And reduce to the lowest common coefficient.
H⁺(aq) + OH⁻(aq) = H₂O(l)
Element Y has two naturally occurring isotopes. The most dominant isotope has a mass of 114.3789 amu and a percent abundance of 64.23%. What is
the mass of the second isoptope if the average atomic mass is 128.4359 amu? Remember that the two percentages will have to sum to 100%.
Answer to the correct number of sigtigs including units in your answer.
(to receive full credit, work must be submitted for this question)
Answer:
153.6771 amu
Explanation:
From the question given above, the following data were:
Isotope A:
Mass of A = 114.3789 amu
Abundance (A%) = 64.23%
Isotope B:
Mass of B =.?
Abundance (B%) = 100 – A%
Abundance (B%) = 100 – 64.23
Abundance (B%) = 35.77%
average atomic mass of Element Y = 128.4359 amu
The mass of the 2nd isotope (i.e isotope B) can be obtained as follow:
Average atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100]
128.4359 = [(114.3789 × 64.23)/100] + [(Mass of B × 35.77) /100]
128.4359 = 73.4656 + (Mass of B × 0.3577)
Collect like terms
128.4359 – 73.4656 = Mass of B × 0.3577
54.9703 = Mass of B × 0.3577
Divide both side by 0.3577
Mass of B = 54.9703 / 0.3577
Mass of B = 153.6771 amu
Therefore, the mass of the 2nd isotope is 153.6771 amu
newto 's first law of motion states than an object motion will not change unless blank
newton's first law of motion states than an object motion will not change unless subjected to an external force.
what would happen to the atom calcium if you added 3 protons?
Answer:
Vanadium
Explanation:
Atomic number increases, thereby changing into an atom of Vanadium
Answer:
Vanadium
Explanation:
Science rocks
Does anybody know this question
Can an organism be made of only one cell?
An atom of an element contains 6 protons, 6 neutrons, and 6 electrons. An atom that is a different isotope of this element would contain —
A.
6 protons, 7 neutrons, and 6 electrons.
B.
6 protons, 6 neutrons, and 7 electrons.
C.
7 protons, 6 neutrons, and 6 electrons.
D.
7 protons, 7 neutrons, and 7 electrons.
Answer:
A
Explanation:
An atom that is a different isotope of a given element would contain 6 protons, 7 neutrons, and 6 electrons. Therefore, option (A) is correct.
What is an isotope?Isotopes are atoms of an element that contain the same atomic number as the original element but a different atomic mass. Isotopes of an element possess the same number of electrons and the number of protons but different numbers of neutrons in their respective nucleus.
For example, the isotopes of carbon are carbon-14, carbon-13, and carbon-12. Carbon-14 has a total of 8 neutrons, carbon-13 have a total of 7 neutrons, and carbon-12 has a total of 6 neutrons. So all the isotopes of carbon have different numbers of neutrons.
Given element has 6 protons, 6 neutrons, and 6 electrons. So the isotope of this element will have 6 protons, and 6 electrons but not 6 neutrons. Therefore, the element with 6 protons, 7 neutrons, and 6 electrons is the isotope of the given element.
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what is one way that the thermal energy of a system may be changed?
Answer:
In a open system, the thermal energy of a system may be changed by adding or removing matter with a different temperature.
Explanation:
The thermal energy of a system can be changed when a new substance of different temperature is introduced into the system
The thermal energy of a system is the amount of heat energy contained in that system.
The quantity of heat in a system is given as;
[tex]Q = mc \Delta \theta[/tex]
where;
[tex]\Delta \theta[/tex] is the change in the temperature of the system
When a new substance is introduced into the system, the temperature of the resulting system changes.
For example;
a hot iron introduced into a cold water, will increase the temperature of the water thereby increasing the thermal energy of the water.Thus, the thermal energy of a system can be changed when a new substance of different temperature is introduced into the system.
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PLEASE HELP
Chemical name for PbCl4
Answer:
Lead tetrachloride
Explanation:
Which of the following statements is most accurate?
A. When liquid water is heated, the molecules move faster.
B. When liquid water is heated, the molecules collide more often.
C. When liquid water is heated, collisions between molecules are more violent.
D. All of the above.
Answer:
D: All of the above
Explanation:
It's all of the above, they are all pretty similar to the accurate answer.
Answer:
D
Explanation:
Now what we've found the volume, let's take a look at the mass. We didn't tare, or zero, the scale before pouring in the fluid. If the value on the scale immediately before pouring in the fluid read 80.1g, what is the mass of the fluid?
A. 86.5 g
B. 246.7 g
C. 116.5 g
Answer:
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PLEASE HELPPPPP I WULL MARK BRAINLEIST
Answer:
the answer is: 10
Explanation:
To find density you do mass divided by volume
please help me quickly
Answer: 2
Explanation:
Answer:
It is two
Explanation:
6. Would a short-term or long-term change allow for an adaptation?
Answer:
long term change
Explanation:
because it takes time
What happens to the oxygen and carbon dioxide as we breathe
Answer:
Your lungs deliver oxygen and remove carbon dioxide from your blood in a process called gas exchange. Gas exchange happens in the capillaries surrounding the alveoli, where the oxygen that is breathed in enters the circulatory system and carbon dioxide in the blood is released to the lungs and then breathed out.
Were any scientific investigations conducted for proposing the theory? Was this theory tested or simply expected?
Answer: Yes
Explanation:
Scientific theory can be defined as the solutions to the problems of the queries related to natural phenomena or it is the explanation for different aspects of the natural world. It is done with repeated testing procedure. To prove the facts of the theory, repeated experimental tests, and observations are done. The theories are tested under the controlled conditions of the experimental set up.
On the basis of the above description, we can say that the scientific investigations are done in the form of experimentation trials before proposing a theory. The theory is tested and is not simply expected.
Answer: Yes, Clements compared ecological succession with the development of organisms. Yes, this theory was tested.
Explanation:
Which descriptions apply to eukaryotic cells? Check all that apply.
are usually multicellular
contain a true nucleus
contain membrane-bound organelles
has DNA located in the cytoplasm
Answer:
The first 3
Explanation:
Eukaryotic cells are usually multicellular, contain a true nucleus, and contain membrane-bound organelles. Hence, options A, B and C are correct.
What are Eukaryotic cells?The eukaryotic cell has a nuclear membrane that surrounds the nucleus, in which the well-defined chromosomes (bodies containing the hereditary material) are located.
Eukaryotic cells are usually multicellular, contain a true nucleus, and contain membrane-bound organelles.
Hence, options A, B and C are correct.
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Make a claim about whether air is matter and whether light is matter. Support your claims with evidence and explain your reasoning.
Answer: air is matter, it has mass and it takes up space
2 Which thing has the most mass?
O marble
elephant
O fork
Obaseball
Explanation:
marble is the correct answer
Answer:
Elephant
Explanation:
An elaphant is the option with the most mass.
Hope this helps! Please makr brainliest! Stay safe, God bless and happy studying!
If Neon atom has 10 protons and 12 neutrons, what would be this
Atom's mass number?
Answer:
Hmmmm, Z=10 the element is not fluorine, and its not sodium.
Explanation:
If you are doing your chemistry homework, you must have a Periodic Table beside you. You will also be supplied a Periodic Table in every test in Chemistry and Physics you will ever sit. So get your Periodic table, and consider the following. It has 10 electrons, 10 fundamental negative charges. Since the element is neutral, it has 10 fundamental positive charges, 10 protons, in its nucleus. In the nucleus there are also 12 massive, neutral particles, 12 neutrons. The number of protons, Z, defines the atomic number, and the Periodic Table is arranged according to Z.
.
If an electron is transferred from A to B in the chemical reaction shown here,
what molecule has been reduced?
AB
A+
A
B
if an electron is passed from Ago B then Slides electrons which makes it electropositive i.e A+
According to the redox reactions , when an electron is transferred from A to B , B molecule has been reduced as it gains electrons.
What are redox reactions?Redox reactions comprise of two parts a reduced part and an oxidized part, which occur simultaneously . The part which is reduced gain electrons and hence there is a increase in oxidation state of the species.
While, the part which is oxidized looses electrons and hence there is a decrease in oxidation state of the species.During redox reactions, there is no net change in the number of electrons . Electrons which are given off in oxidation are used up in reduction.
The ion or molecule which accepts electrons is called as oxidizing agent while the ion or molecule which donates electrons is called as a reducing agent.
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What is the mass of 0.042 mole C8H18
Hope this help you!!! :))
The mass of C8H18 is 4.788g
In chemistry,
The number of moles of a compound is given as Mass/ Molar mass
For C8H18, The molar mass will be calculated as
C8H18=12 x 8 +1 x 18=96+18=114 g/mol
Putting the value in the equation
Number of moles= Mass/Molar mass
0.042moles =Mass/ 114g/mol
Mass=0.042 x 114=4.788g
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10. An atom that has 13 protons and 13 electrons is a neutral aluminum (Al) atom. An atom that has 13 protons and 10 electrons is a-
Answer:
An atom of Al which has 13 protons and 10 electrons is Al cation (Al⁺³)
Explanation:
An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.
All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other.
For example,
Al atom has 13 protons and 13 electrons. The number of positive and negative charge is equal thus it will be neutral atom.
While the atom of Al which have 13 proton and 10 electron is not neutral. The positive charge is greater than negative by 3. Which means 3 electrons are lose by Al atom and form cation "Al⁺³".
Thus an atom of Al which has 13 protons and 10 electrons is Al cation (Al⁺³)
Answer:
19
Explanation:
Pilots of hot air balloons are able to steer them somewhat by moving them up or down to enter different air currents that move in different directions. Explain how the flame can be used to do that.
Answer:
To understand this first we must understand what is happening at the molecular level. When we heat any substance it changes its state of matter because its molecules get excited. For example, when we heat water it turns into gas so the molecules get excited. The hot air balloon will move faster if we add heat because the gas molecules will get excited and push against the balloon, making it faster. If we start removing heat, the balloon's acceleration will slow down because the molecules will get less excited.
Hot air balloons flies by means of it being lighter than air
The flame can be used to move the pilot to different directions by increasing the temperature of the air in the balloon and therefore, the volume, therefore, decreasing the density of the air which changes the elevation of the balloon to the appropriate elevation having winds moving in the desired direction
The principle by which the above process works is as follows:
According to Charles law, the volume of a mass of gas is directly proportional to its Kelvin temperature
V ∝ T
[tex]\dfrac{V_1}{T_1} = \dfrac{V_2}{T_2}[/tex]
[tex]V_2 = T_2 \times \dfrac{V_1}{T_1}[/tex]
[tex]Density, \rho = \dfrac{Mass, \ m}{Volume, \ V}[/tex]
Therefore, as the temperature is increased, the volume occupied the mass gas increases, and therefore, the density decreases
The principle on which the hot air balloon operates on is the principle that hot air is less dense than and therefore, rises above cool air
Therefore, the pilot of an hot air balloon heats up the air in the balloon to allow the balloon to rise and the pilot switches off the burner so that the air in the balloon cools and the balloon looses altitude
The mechanism of the hot air balloon does not have a steering, and therefore, the wind direction is used to steer the balloon
The direction of the wind is different at different altitude, such that by obtaining the direction of the wind at a given altitude, the pilot can raise or lower the balloon up or down to the altitude having the desired wind direction, by increasing the temperature of the air in the balloon by switching on the burner to go to a higher altitude, or by switching off the burner so the air in the balloon cools and the balloon loses some of its altitude to reach the wind going in the direction of the pilot
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Answer sheets for data nuggets anyone
What are the three was main States of matter?
Answer:
liquid, solid, gas
Explanation:
Solid, Liquid and gaseous
There are 5 states of matter
1.) Solid
2.) Liquid
3.) Gaseous
4.) Plasma
5.) Bose Einstein
the First three are main
Oxidation state of sulphur in H2S 2o7
Answer:
+6
Explanation:
2(+1)+2x+7(−2)=0
2+2x−14=0
2x=+12
x=+6