Answer:
An atom has a nucleus, made up protons and neutrons, which is surrounded by a cloud of electrons.
Explanation:
An atom is the smallest indivisible part of any element that takes place in a chemical reactions.
These are the fundamental building blocks of every element and even compounds.
There are three known subatomic particles found within an atom. Electrons are the negatively charged particles in an atomProtons are the positively charged particles of an atomNeutrons do not carry any charges.Both protons and neutrons are located within the tiny space called nucleus at the center of an atom.
Electrons moves round in orbitals at the spaces outside of the nucleus.
if 64.1g of sulfur dioxcide react completly with 159.9g of bromine and a unknown amount of water to form 161.9g of hydrogen bromide and 98.1g of sulfruic acid how many grams of water ?
Hello! can a rock transform in to ANY type of rock? and why or why not
Answer:
yes it can
Explanation:
because, it depends on where the rock is, for example on a dessert it would Be cracked and things like that if near an eruption it would be the flamey black rock, and so on you get it
A 25-year-old female presents to her primary care physician with complaints of muscle
tension, especially in her shoulders and neck, contributing to tension headaches, She
describes decreased sleep, chronic fatigue and constant restlessness in addition to poor
concentration at work, with repeated run-ins with her coworkers. She has been a worrier
since childhood, with worsening bouts when under stress. Physical exam reveals a healthy,
tense female with normal vital signs and generalized muscular tension. She does not abuse
substances, and medical history is unremarkable,
magnesium has two naturally occurring isotopes: magnesium-24 and magnesium-25. if the average atomic mass of magnesium is 24.305 amu, what are the percent abundance's of each isotope?
a. 69.5% and 30.5%
b. 50% and 50%
c. 62% and 38%
d. 0.7% and 0.3%
e. .62% and .38%
Answer:
a. 69.5% and 30.5%
Explanation:
we know there are two naturally occurring isotopes of Mg, Mg-24 and Mg-25.
First of all we will set the fraction for both isotopes
X for the isotopes having mass 25
1-x for isotopes having mass 24
The average atomic mass of Mg is 24.305 amu.
we will use the following equation,
25x + 24 (1-x) = 24.305
25x + 24 - 24x = 24.305
25x- 24x = 24.305 - 24
1x = 0.305
x= 0.305 /1
x= 0.305
0.305 × 100 = 30.5 %
30.5 % is abundance of Mg-25 because we solve the fraction x.
now we will calculate the abundance of Mg-24.
(1-x)
1-0.305 =0.695
0.695 × 100 = 69.5%
69.5% for Mg-24.
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A 10.0 g sample of water was heated from 20.0°C to 50.0°C. How much energy did the water gain? The specific heat of water is 4.18 J/g·°C.
836 J
836 J
1250 J
1250 J
2920 J
2920 J
4180 J
Answer
I think its
1250J
How many grams in 3.4 moles of Neon (Ne)?
Answer:
60.42 grams
Explanation:
So, neon has a molar mass of 20.18 g/mol , which means that every mole of neon has a mass of 20.18 g so that means three of them is 60.42 grams
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The human hand has a unique adaptation called....?
Answer:
Humans, as well as monkeys, gorillas, and other primates, have a hand that can grip and grasp objects because they have an opposable thumb. The earliest primates were arboreal (they climbed trees), and so having grasping hands was an advantage in this environment.
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Which statement is TRUE comparing the research of Bohr, Rutherford, and Dalton?
Dalton and Bohr modeled their experiments and their theories after Rutherford.
Dalton and Rutherford modeled their experiments and their theories after Bohr.
All three scientists developed their theories at the same time.
Rutherford and Bohr modeled their experiments and their theories after Dalton.
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Answer:
Dalton was first with the modeling They soon followed so the answer is D: rutherford and bohr modeled their experiments4) During convection, what happens to a fluid?
Hot fluids will rise, while cold fluids sink.
Cold fluids will rise, while hot fluids sink.
Both hot and cold fluids will rise.
Both hot and cold fluids will sink.
Answer:
it's the first one
Explanation:
hot fluids rise out the cold fluids
Why does Argon have a zero valency?
brainliest for the right answer
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If you asking about the neon and argon thing then I'll answer it tho!
Neon and Argon's are fully filled electron's in their 1 st shell or most likely it's outermost shell which have 8 electron's in total and it cannot take or loose any of them and it can't even share it tho to anyone and that's why argon have a zero valency
Which of the following would be the least likely cause of a volcanic eruption?
O tectonic plates colliding
O gas pressure within Earth's crust
O tectonic plates sliding past each other
O new magma flowing into an already-full magma chamber
O new magma flowing into an already-full magma chamber
Answer:
D
Explanation:
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The four fundamental forces are arranged in the increasing order of their relative strength.
(A, B and C represent three of the fundamental forces.)
A
Which statement is true about the fundamental forces represented by B and C?
Both have short range.
Both have infinite range.
O Both act only between charged particles.
Both act only between non-atomic particles.
Answer:
Both have infinite range i believe
Explanation:
The four fundamental forces are arranged in the increasing order of their relative strength. Then both have infinite range. Therefore, option B is correct.
What is relative strength ?A ratio of a stock price performance to a market average performance is called relative strength. In technical analysis, it is employed. It shouldn't be mixed up with the relative strength index.
Calculating the relative strength comparison indicator requires dividing the price of one asset by the price of another security (the "base" security). The ratio, or relationship, between the two securities, is the outcome of this split.
A classic example of a relative strength activity would be gymnastic movements requiring only the client's body weight. It is likely that clients who have a suitable amount of relative strength are less exhausted and more effective in shifting their body weight in space.
Thus, option B is correct.
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Chemistry skeletal structure
Answer:
Your answer is attached DAME!!!
What does an energy flow diagram tell
people?
that energy is easily created
that energy is not created, it simply changes
from one form to another
that the exact amount of energy present at any
given time
that energy is difficult to use
que
please someone help I'm very confused
How much time in hours would it take a car to drive 100 miles at a speed of 33 miles per hour?
Answer:
[tex]3.03 \: or \: 3\frac{1}{33} (in \: fration) \: hours[/tex]
Explanation:
33 miles takes 1 hour
1 " " 1/33 "
100 " 100×1/33
3.03 hours
Help me i don’t know what to put here pls thank you!
Help if your good at science
What is the name of the planet next to the label a?
Answer:
The answer to the question is Mercury.
Answer:
Mercury
Explanation:
The planet to the left of A is mercury it is on the 4 row outside the asteroid belt
Which way would CCI2F2 orient in an electric field?
Answer:
See explanation
Explanation:
In looking at molecules to determine whether they are polar or not we have to look at two things basically;
i) presence of polar bonds
ii) geometry of the molecule
Now, we know that CCI2F2 is a tetrahedral molecule, but the molecule is not symmetrical. It has four polar bonds that are not all the same hence the molecule is polar.
In an electric field, polar molecules orient themselves in such a way that the positive ends of the molecule are being attracted to the negative plate while the negative ends of the molecules are attracted to the positive plate.
So the positive ends of CCI2F2 are oriented towards the negative plate of the field while the negative ends of CCI2F2 are oriented towards the positive ends of the field.
A molecule of (BLANK)
gas has a single covalent bond
between the two atoms that it's comprised of. This allows
each atom to attain the electron configuration of the noble
gas helium.
Answer:
Hydrogen
Explanation:
The noble gas helium is found in the first period in the periodic table. The only element that is also in that period is hydrogen.
Now, helium has two electrons in its outermost shell. It is the first member among the noble gases.
Each hydrogen atom has only one electron. Therefore, when two hydrogen atoms are joined by a singe covalent bond to form hydrogen gas, each hydrogen atom now has two electrons thereby attaining the electronic configuration of helium, the nearest noble gas to hydrogen.
What is the correct formula for nitrogen?
The correct chemical formula for nitrogen gas is N2. For example, "Nitrogen gas is one of the diatomic elements, in which one molecule consists of two atoms of the same element bonded by one or more covalent bonds."
Balance the equation K2SO4 + HNO3 ->KNO3 + H2SO4 what's the final balanced equation
Answer:
2KNO3 + H2SO4 → K2SO4 + 2HNO3
Explanation:
Hope this helps
Which of these substances is a compound
1.carbon
2. chlorine
3. uranium
4. ammonia
Answer:
number 4. Ammonia
A chemical reaction produces 278 L of nitrogen at STP. How many moles of nitrogen are produced by
the reaction?
Answer:
7
Explanation:
4+3-2+2+-5x6 to the power of 2 minus 17=7
According to ideal gas equation, 0.122 moles of nitrogen are produced by the reaction.
What is ideal gas equation?The ideal gas equation is a equation which is applicable in a hypothetical state of an ideal gas.It is a combination of Boyle's law, Charle's law,Avogadro's law and Gay-Lussac's law . It is given as, PV=nRT where R= gas constant whose value is 8.314.The law has several limitations.The law was proposed by Benoit Paul Emile Clapeyron in 1834.The ideal gas law is applicable to ideal gases.The graph of ideal gas equation is a straight line passing through the origin.
Substituting the values of P=1 atmosphere, V= 278 liters,R= 8.314, T= 273 K in the above equation that is n=PV/RT=1×278/8.314×273=0.122 moles.
Thus, 0.122 moles of nitrogen are produced by the reaction.
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two parts that make up a solution are... what
HCl(aq)+NaOH(aq) → NaCl(aq)+H2O)
A student had two dilute, colorless solutions, HCl(aq) and NaOH(aq), which were at the same temperature. The
student combined the solutions, and the reaction represented above occurred. Which of the following results
would be evidence that a chemical reaction took place?
The resulting solution is colorless.
The total volume of the mixture is approximately equal to the sum of the initial volumes.
The temperature of the reaction mixture increases.
The resulting solution conducts electricity.
Answer:
The temperature of the reaction mixture increases.
Explanation:
One very good indicator that a chemical reaction has taken place is that there is a temperature change about the reaction.
Either an emission of heat involving the reaction milieu becoming hotter or an absorption of heat making the environment colder.
Enthalpy changes of reactions are good parameters to measure whether or not a reaction has taken place. There is no color change, and mass is always conserved for most reaction, so we cannot use these tools for assessing whether a reaction has occurred or not.The branch of science which deals with the study of chemicals is called chemistry.
According to the question, we have to find the solution of subparts of the question, the answer is option C.
The reaction mentioned in the question is the neutralization reaction, In which acid and base react with each other to form a neutral compound called salt.
Here, salt is NaOH, the chemical reaction is confirmed by the changes in the odor and the rise in temperature as the reaction is an exothermic reaction.
Hence, the correct option is C that is the temperature of the reaction mixture increases.
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The half-life of carbon 14 is 5,730 years. How much would be left of an original 50-gram sample after 2,292 years
Answer:
37.9g of carbon 14 remains
Explanation:
The radioactive decay of an atom follows the equation:
Ln[A] = -kt + Ln[A]₀
Where [A] is amount of isotope after time t, k is decay constant and [A]₀ initial amount of the isotope.
We can find k from half-life using:
k = ln 2 / Half-Life
k = ln 2 / 5730 years
k = 1.2097x10⁻⁴ yrs⁻¹
Replacing in the equation all values:
Ln[A] = -1.2097x10⁻⁴ yrs⁻¹*2292yrs + Ln[50g]
Ln[A] = 3.635
[A] = 37.9g of carbon 14 remains
When the Sun provides heat energy to the water cycle it creates which of the following?
Answer: Evaporation
Explanation:
When the heat of the sun touches the water, the water molecules heat up and move gradually faster. Over time molecules start to pop out the surface of the water individually.
And then eventually all the water is evaporated into water vapor.
A gold chain has a volume of 4cm3. The density of gold is 19.3 g/cm3. Calculate the mass of the gold chain. Which one is it ?
-4.8 grams
-23.3 grams
-0.21 grams
-77.2 grams
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If a sample of magnesium has a mass of 72.9 g, how many moles of magnesium does the sample contain?
1.00 mole Mg
1.00 mole Mg
1.50 moles Mg
1.50 moles Mg
2.00 moles Mg
2.00 moles Mg
3.00 moles Mg
Answer:
3.00 moles Mg
Explanation:
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 3.03moles of magnesium has a mass of 72.9 g. the correct option is option D.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
number of moles of magnesium =given mass of magnesium÷ molar mass of magnesium
Molar mass of magnesium =24g/mol
mass of magnesium =72.9 g
substituting all the given values in the above equation, we get
number of mole of magnesium=72.9 g÷ 24g/mol
=3.03moles
Therefore, 3.03moles of magnesium has a mass of 72.9 g. the correct option is option D.
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