Explanation:
Question 1
D
Question 2
D
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
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."
) What effect does the attraction among Earth, the moon, and the sun cause?
help for 13 points
Answer:
earth is were humans live for live and the moon controls the water and the sun gives heat for us humans and plants and life
Explanation:
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What type of reaction are each of these reactions:
Mg + CuSO4 —> MgSO4 + Cu
2HCI + Mg(OH)2 —> MgCI2 + H2O
AgNO3 + NaCI —> AgCI + NaNO3
(single displacement, double displacement or acid-base reaction)
1. Mg + CuSO4 —> MgSO4 + Cu
=> Single displacement reaction
2. 2HCI + Mg(OH)2 —> MgCI2 + H2O
=> Acid - base reaction
3.AgNO3 + NaCI —> AgCI + NaNO3
=> Double displacement reaction
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.
How many moles are in 4.3 x 1022 molecules of Na3PO4?
Answer:
0.071 moles of Na₃PO₄
Explanation:
Given data:
Number of moles of Na₃PO₄ = ?
Number of molecules of Na₃PO₄ = 4.3×10²² molecules
Solution:
1 mole contain 6.022×10²³ molecules
4.3×10²² molecules × 1mol / 6.022×10²³ molecules
0.71×10⁻¹ mol
0.071 mol
The number 6.022 × 10²³ is called Avogadro number.
Avogadro number:
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
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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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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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
Which of the following covalent bonds is the most polar?
a.H-C
b.H-N
c.H-H
d.H-F
Answer:
H-F bonds are the strongest.
As Fluorine is the most electronegative element.
The shadow zone exists because ?
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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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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.
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.
Balance the equation K2SO4 + HNO3 ->KNO3 + H2SO4 what's the final balanced equation
Answer:
2KNO3 + H2SO4 → K2SO4 + 2HNO3
Explanation:
Hope this helps
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.
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
I'm hot right? here's a pic of me
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
!Hope This Helps!
5 L of ideal gas are in a container with a pressure of two ATM. But will be the pressure if we decrease the volume of the container to 2.5 L?
Answer:
1
Explanation:
5÷2=2.5 that means it's 2.5 L for every one ATM
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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.
HELPPPPPPPPPP PLEASEEEEEEEE
Answer:
Dalton was first with the modeling They soon followed so the answer is D: rutherford and bohr modeled their experimentsTrue or False. A producer is a heterotrophic organism that consumes other organisms for nutrients and energy.
Answer:
True.
Explanation:
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 ?
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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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4) 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
1. Which of the following examples would be ionic? *
Answer:
a
Explanation:
because it has two elements are found
Answer:
calcium chloride is ionic
Explanation:
CaCl2 is an ionic bond. This is because the calcium gives up an electron to each of the chlorine atoms resulting in the calcium becoming Ca2+ ions while the chlorine forms Cl- ions.
Which of these substances is a compound
1.carbon
2. chlorine
3. uranium
4. ammonia
Answer:
number 4. Ammonia
Chemistry skeletal structure
Answer:
Your answer is attached DAME!!!
two parts that make up a solution are... what