Answer:
Below
Explanation:
2HCl + K2CO3 -> 2KCl + CO2 + H2O
The table describes some characteristics of a layer of earth
Which layer is described by the data in the table?
crust
mantle
outer core
inner core
Answer:
crust .......
.........
Darrell has 35 grams of melted chocolate. He pours all of the melted chocolate in molds. After he allows them to cool, Darrell has two solid bars of chocolate.
If the two solid chocolate bars contain all of the melted chocolate, what is their combined weight?
A.
It depends on how long it took the chocolate to cool.
B.
The chocolate bars weigh more than 35 grams.
C.
The chocolate bars weigh exactly 35 grams.
D.
The chocolate bars weigh less than 35 grams.
Answer:
A
Explanation:
it is correctly right????
Answer:
B.
The chocolate bars weigh more than 35 grams.
HELP!! please choose all the correct answers, picture attached
Answer:
Only C. is wrong else every option is correct.
Explanation:
Hope this helps you. If you want explanation then ask in comments. Good luck!
help please !!! THANK YOU !
Answer:The nucleus emits particles and/or energy.
Explanation:
Yo can someone explain the heat of fusion and heat of vaporization thing to me?
Answer:
The heat of fusion is the amount of energy required to change a solid into a liquid at its melting point. When a liquid becomes a solid, freezing or solidification has occurred. The heat of vaporization is the energy required to change a liquid into a gas at its boiling point.
Explanation:
What is the mass number for an atom of xenon containing 54 protons and 75 neutrons?
Answer:
Answer should 133
Explanation:
all you have to do is add the protons and neutrons
The mass number for an atom of xenon containing 54 protons and 75 neutrons is 129 amu.
What is an Atomic mass of an atom?The Atomic mass of any atom may be defined as the mass of an atom that is togetherly constituted by protons and neurons in the nucleus of an atom. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number).
The mass number of Xenon is calculated by the following formula:
The Number of neutrons = Mass number - Atomic number.
where, number of neutrons = 75, and number of protons = 54.
75 = Mass number - 54 (number of protons = atomic number).
Mass number = 75 + 54 = 129 amu.
Therefore, the mass number for an atom of xenon containing 54 protons and 75 neutrons is 129 amu.
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Alkali metals react violently with water. How much Hydrogen gas (in g) is produced when 10.0 g of sodium reacts with excess water according to the following equation?
2Na + 2H2O ----> 2NaOH + H2
The mass of Hydrogen gas produced when 10.0 g of sodium reacts with excess water is 0.44 g.
From the question,
We are to determine the mass of Hydrogen gas produced when 10.0g of sodium reacts with excess water.
From the balanced chemical equation for the reaction
2Na + 2H₂O → 2NaOH + H₂
This means
2 moles of sodium reacts with 2 moles of water to produce 2 moles of sodium hydroxide (NaOH) and 1 mole of Hydrogen gas.
Now, we will determine the number of moles of sodium present
Mass of sodium = 10.0 g
Atomic mass of sodium = 22.99 g/mol
From the formula
[tex]Number\ of\ moles\ = \frac{Mass}{Molar\ mass}[/tex]
∴ Number of moles of sodium present = [tex]\frac{10.0}{22.99}[/tex]
Number of moles of sodium present = 0.43497 mole
From the balanced chemical equation
2 moles of sodium reacts with 2 moles of water to produce 1 mole of Hydrogen gas.
Then,
0.43497 mole of sodium will react with 0.43497 mole of water to produce [tex]\frac{0.43497}{2}[/tex] mole of Hydrogen gas
[tex]\frac{0.43497}{2} = 0.217485[/tex]
∴ 0.217485 mole of Hydrogen gas was produced during the reaction
Now, for the mass of Hydrogen gas produced
Using the formula
Mass = Number of moles × Molar mass
Molar mass of H₂ = 2.016 g/mol
∴ Mass of Hydrogen gas produced = 0.217485 × 2.016
Mass of Hydrogen gas produced = 0.43845 g
Mass of Hydrogen gas produced ≅ 0.44 g
Hence, the mass of Hydrogen gas produced when 10.0 g of sodium reacts with excess water is 0.44 g.
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How many grams of liquid water can be heated by 8920 joules through a change in temperature of 30K?
Answer:
One of water's most significant properties is that it takes a lot of energy to heat it. Precisely, water has to absorb 4,184 Joules of heat (1 calorie) for the temperature of one kilogram of water to increase 1°C. For comparison sake, it only takes 385 Joules of heat to raise 1 kilogram of copper 1°C.
Explanation:
Which best describes a meniscus?
what is the answer to (x+3)=4
Answer:
1
Explanation:
x + 3 =4
subtract 3 from 4
You are left with one.
Plug in the answer
1+3=4
why is the Universal Law of Gravitation is a scientific Law and not a theory?
HELP!! please choose all the correct answers, picture attached
The accepted value of Ksp is 1.2×10−12 for Ag2CrO4. Calculate the percentage error if your experimentally determined value for Ksp was 1.5×10−10.
The percentage error in the experimental determination is 124%.
The experimentally determined value for Ksp = 1.5×10^−10
The accepted value of Ksp = 1.2 × 10^−12
The formula for percentage error is;
% error = absolute value of ( actual value - experimental value)/actual value × 100/1
% error = absolute value of (1.2 × 10^−12 - 1.5×10^−10)/ 1.2 × 10^−12 × 100/1
% error = 124%
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Part A
Enter an equation for the precipitation reaction that occurs (if any) when solutions of ammonium chloride and calcium nitrate are mixed.
Express your answer as a chemical equation. Identify all of the phases in your answer. Enter noreaction if no precipitate is formed.
ΑΣΦ
?
2NH, Cl(aq) + Ca(NO3)2 (aq) +CaCl, (s) + 2N, O(g) + 4H, O(g)
DA chemical reaction does not occur for this question
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The equation of reacting ammonium chloride with calcium nitrate will be: [tex]Ca(NO3)_2(s) + 2NH_4CI(s) --- > 2N_2O(g) + CaCl_2(s) + 4H_2O(g)[/tex]
What are chemical reactions?They are reactions involving chemical reactants.
Ammonium chloride, in solid form, will react with calcium nitrate, also in solid form to produce dinitrogen oxide gas, solid calcium chloride, and water vapor.
The equation of the reaction is represented as follows:
[tex]Ca(NO3)_2(s) + 2NH_4CI(s) --- > 2N_2O(g) + CaCl_2(s) + 4H_2O(g)[/tex]
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Nadine was cooking a pot of potatoes on the stove. When the potatoes were don’t she needed to remove the potatoes for the water. Which separation technique would be most efficient and effective method for Nadine to use to achieve this
Answer:
boiling
Explanation:
Fill in the [?]
73,542 m = [?] km
Give your answer in standard form.
How many Joules are there in 3301 calories? (1 cal = 4.18 J)
Answer:
13798.18 J
Explanation:
3301 cal * 4.18 J/1 cal = 13798.18
Recall that (1 cal = 4.18 J)
giuioiijihovicutxcvyg
Answer:
ajajbshdbrbxjdnd djxbxbx
Explanation:
hdjdndjsosnbdjdkx dkdmdbdjd
How many protons and neutrons are in the nucleus of zinc-72
Answer:
30 protons
Explanation: Each zinc isotope contains 30 protons, 30 massive, positively charged nuclear particles
30 protons, 34 neutrons, and 30 electrons.
Which of the following is a non-reactive metal with 2 valence electrons?
O Magnesium
Chlorine
Carbon
Helium
Answer:
» a. MagnesiumExplanation:
• Magnesium is least reactive and • Magnesium has atomic number 12. Its electronic configuration is 2,8,2 . Thus, it has 2 valence electrons.Help again thank you lots of points for you keep helping I will give you a good review thanks!
Answer:
it would prob be planet y
How many electrons does the oxygen atom need to become stable?
Answer:
2 electrons
Explanation:
Oxygen has 6 valence electrons and to be stable it needs 8. That means it needs 2 more electrons to have a full octet.
Suppose a scientist wants to test a new drug to fight the flu. The scientist injects the drug into 3 people with the flu. The scientist injects a harmless solution into three other people with the flu. In this experiment, what is the variable group and what is the control group?
Answer:
the people injected with the drug are the variable group while the people injected with the harmless solution are the control group
Hydrogen protons collide with one another to create:
A). Helium and energy.
B). Boron and energy.
C). Carbon monoxide and energy. D). None of the above.
ora
If a student is combining two
substances and sees bubbles and
is probably taking
fizzing, a
place.
A. chemical change
B. physical change
Answer:
A a chemical change
Explanation:
because a chemical change is when you mix tow substance together and they creat a new substance
Fill in words that correctly complete this sentence. Anna looks around the skating rink and notices many examples of the movement of thermal energy. For example, she sees her friend holding a cup of hot chocolate in the cold rink. Thermal energy flows from ( ) matter to ( ) matter.
Answer:
hot to cold matter
Which of the following is not a derived unit?
A) g/ml
B) liter
C) kg
D) All of these are derived.
What is the relationship between number of electrons on the outer energy levels and
groups?
Answer:
Every element in a given group has the same number of valence electrons. For elements in the main groups (1-2, and 13-18), the number of valence electrons increases when moving from left to right along any period (row). The noble gases contain a full valence electron shell, which consists of eight electrons.
Explanation:
Hope this helps.
Answer:
Valence Electrons
Explanation:
Say you are looking at a neutrally charged carbon atom, it has 6 electrons. The first electron shell can hold 2 electrons. The next can hold 8, the next can hold 8 and the next can hold ten and so on... Well in the Carbon atom case, it has 6 electrons, 6-2 is 4, so the carbon atom at 4 valence electrons, which actually helps it in making organic molecules, which in turn also helps make something you might have heard of before, organisms, the best example being, humans
An organic compound containing C, H, O gives the following data on analysis. Composition by mass: %
C = 52.2, % H = 13.0, % 0 = 34.8. Relative molecular mass = 46. Identify the molecular formula of the organic compound.
My answer is C2H6O. Is it correct?
The RDI for sodium for adults is 2300mg. What amount of table salt (in grams) contains this quantity of sodium? Express answer to two significant figures and include the appropriate units.
The amount of table salt (in grams) contains this quantity of sodium is 5.844 g.
What is table salt?Table salt is made up of sodium and chloride. The chemical formula of table salt is NaCl. This is a common salt used daily in the kitchen. This gives us a taste of food. And it is also necessary for the body.
The RDI for sodium for adults is given that is 2300 mg. The quantity of sodium is given = 2300 mg = 2.30 g (since the answer is asked in grams)
As we know, table salt is NaCl.
The molar mass of table salt (NaCl) is 58.44 g/mol
The molar mass of sodium (Na) is 23.00 g/mol
So, for 23.00 g sodium, we need 58.44 g NaCl.
And, for 2.30 g sodium we require (58.44 g x 2.3 g) / 23 g = 5.844 g = 6 g (to one significant figure).
Therefore, the amount of sodium is present in 5.844 grams of table salt.
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