Answer:
b. 39 Neutrons would be correct.
can you solve these?
Answer:
yes
Explanation:
it's easy
PLS HELP I WILL GIVE BRAINLIEST
Answer:
The answer has to be A, greater force of attraction than the gas, only
Explanation:
I really hope this helps! Have a good day and good luck!
Learning Task 3 Directions: Below are description of tools that need maintenance. Give the immediate maintenance procedure that should be done. Write your answers on a separate sheet of paper.
Preventive Maintenance Task of Tools and Equipment Description
1. a rake with wet wooden handle
2. a filler covered with sticky plant sap
3. clogged air filter of a chain saw
4. uncoiled garden hose
5. a wheelbarrow that won't roll
ANSWER:
1.
2.
3.
4.
5.
How many grams of sodium are contained in 4moles of na2co3
Answer:
424 grams of sodium are contained in 4moles of na2co3
Classify the molecules based on whether the molecule has a standard enthalpy of formation, AH;, equal to 0. Assume all
conditions are at standard pressure and temperature (STP).
The standard enthalpy of formation of substance in its standard state is zero.
Enthalpy is defined as a thermodynamic quantity that describes the energy of a system. For substances in their standard state, the enthalpy of formation is zero.
The standard state of a substance is defined as the state in which it is found under standard conditions. The following substances has their standard ethalpy of formation as zero or not zero;
Zero enthalpy of formation Non zero enthalpy of formation
Cl2(g) I2(s)
Br(g) Br2(l)
I2(g) Br2(s)
Hg(l) Hg(s)
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Identify the element by its symbol and name after looking at the element model pictured below.
Symbol:
Name:
Symbol: O
Name: Oxygen
as number of protons + number of neutrons = atomic mass
8+8=16
The element is Oxygen (O) in the given element model.
The atomic number of an element is equal to the number of protons in its nucleus. Since the element in question has 8 protons, its atomic number is 8. Oxygen has an atomic number of 8, making it the element with 8 protons. Additionally, the atomic number determines the identity of an element; no other element has 8 protons in its nucleus.
The element's name is Oxygen, and its chemical symbol is O. Oxygen is a vital element in the Earth's atmosphere and is essential for supporting life. It is commonly found in the form of diatomic molecules (O2), which make up a significant portion of the air we breathe. Oxygen plays a crucial role in various biochemical and chemical processes, and its presence is essential for the respiration of most living organisms.
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Formula for gallium peroxide
Answer:
Ga₂O
Explanation:
If you place rice on top or a speaker, what will happen to the rice when you turn the speaker on?
The rice will begin to move.
The rice will do nothing
Answer:
The rice will move
Explanation:
the sound vibration and waves will cause the rice to move
Answer:
The rice will begin to move.
Explanation:
Consider the combustion of methane, CH4 :
Suppose 2.8 mole of methane are allowed to react with 5.0 mole of oxygen.
How many grams of CO2 Can be made from this reaction?
(your answer should have three significant figures). Do not include the unit in your answer.
CHA
+
202
CO2
+ 2H20
Answer:
CH4+3/2O2⇒CO2+2H2O
mCO2=2.8*44=123.2
Explanation:
Suggest the stable ion for phosphorus and why?
Phosphorous has 5 valence electrons and so gaining 3 electrons will make it isoelectronic with the stable noble gas argon, and will produce the P3- ion
calculate the gravimetric factor of Fe in Fe2O3
i hope this calculation will help you
Please help me with this question it’s really confusing lol. Question 15
Answer:
i think it might be a giant astroid came and killed everything sorry if im wrong
Explanation:
A skateboarder is shown below.
At which point is the skateboarder's potential energy the greatest?
A. W
B. X
C. Y
D. Z
Answer:
W I think good luck I think
Answer: w
Explanation: potential energy is greater when higher from the ground. i took the test
Have a tour in your kitchen pick five (5) food products having nutrition facts
and ingredients. Look for the name of elements and compounds that are present.
Complete the table below with necessary details from the food labels of the food
product you have picked. Write your answer in a separate sheet of paper.
Answer:
strawberry blueberry raspberry walang compound at element
An atom's mass number equals the number of
Answer:
Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number.
Explanation:
hiiiii
hope u Likes it
In which step of meiosis do chromosomes first condense?
telophase I
telophase II
prophase I
prophase II
Answer:
Someone Said Telophase II. Ill update if its right or wrong when I finish.
Update : He is.... Wong. False.
Explanation:
The answer is Prophase I. It is not Telophase II.
Solid carbon and oxygen gas combine to form carbon dioxide gas .
Answer:
C(s) + O2(g) --> CO2(g)
Explanation:
Answer:
True
Explanation:
Solid carbon and oxygen gas when mixed together reacts, and forms carbon dioxide gas.
In this experiment, between 1.900-2.100 g of a mixture containing the reactants zinc sulfate and sodium phosphate was added to acidified water to undergo a double displacement (precipitation) reaction. This mixture had an unknown percent composition of reactants. To make matters more complicated, the unknown mixture did NOT contain stoichiometric quantities of the reactants.
1. (1 point) Write a molecular equation for the reaction of aqueous zinc sulfate and aqueous sodium phosphate.
For the hypothetical compound AX3, which statement is true?
Answer is B.
A I’d a metal from a group 3A and X is a nonmetal from group 7A
Answer:
i
b because it says it in the question
Drawing Conclusions Why is it important to have such a detailed report on the economy? How does it help the president and Congress make decisions about taxes and expenditures
A detail report is very important for better decisions of President about economy.
It is very important to have such a detailed report on the economy because it helps the president as well as Congress to make better decisions about the imposing of taxes. It greatly helps and provides all information to the president and Congress so that they make better decisions about taxes and expenditures.
Without this detailed report, the Congress can't take right decisions about taxes and economy of the country so we can conclude that detail report is very important for better decisions of president about economy.
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An excess of sodium carbonate, Na, CO3, in solution is added to a solution containing 17.87 g CaCl2. After performing the
experiment, 13.19 g of calcium carbonate, CaCO3, is produced. Calculate the percent yield of this reaction.
Answer:
Approximately [tex]81.84\%[/tex].
Explanation:
Balanced equation for this reaction:
[tex]{\rm Na_{2}CO_{3}}\, (aq) + {\rm CaCl_{2}} \, (aq) \to 2\; {\rm NaCl}\, (aq) + {\rm CaCO_{3}}\, (s)[/tex].
Look up the relative atomic mass of elements in the limiting reactant, [tex]\rm CaCl_{2}[/tex], as well as those in the product of interest, [tex]\rm CaCO_{3}[/tex]:
[tex]\rm Ca[/tex]: [tex]40.078[/tex].[tex]\rm Cl[/tex]: [tex]35.45[/tex].[tex]\rm C[/tex]: [tex]12.011[/tex].[tex]\rm O[/tex]: [tex]15.999[/tex].Calculate the formula mass for both the limiting reactant and the product of interest:
[tex]\begin{aligned}& M({\rm CaCl_{2}}) \\ &= (40.078 + 2 \times 35.45)\; {\rm g \cdot mol^{-1}} \\ &= 110.978\; \rm g \cdot mol^{-1}\end{aligned}[/tex].
[tex]\begin{aligned}& M({\rm CaCO_{3}}) \\ &= (40.078 + 12.011 + 3 \times 15.999)\; {\rm g \cdot mol^{-1}} \\ &= 100.086\; \rm g \cdot mol^{-1}\end{aligned}[/tex].
Calculate the quantity of the limiting reactant ([tex]\rm CaCl_{2}[/tex]) available to this reaction:
[tex]\begin{aligned}n({\rm CaCl_{2}) &= \frac{m({\rm {CaCl_{2}})}}{M({\rm CaCl_{2}})} \\ &= \frac{17.87\; \rm g}{110.978\; \rm g \cdot mol^{-1}} \\ &\approx 0.161023\; \rm mol \end{aligned}[/tex].
Refer to the balanced equation for this reaction. The coefficients of the limiting reactant ([tex]\rm CaCl_{2}[/tex]) and the product ([tex]{\rm CaCO_{3}}[/tex]) are both [tex]1[/tex]. Thus:
[tex]\displaystyle \frac{n({\rm CaCO_{3}})}{n({\rm CaCl_{2}})} = 1[/tex].
In other words, for every [tex]1\; \rm mol[/tex] of [tex]\rm CaCl_{2}[/tex] formula units that are consumed, [tex]1\; \rm mol\![/tex] of [tex]\rm CaCO_{3}[/tex] formula units would (in theory) be produced. Thus, calculate the theoretical yield of [tex]\rm CaCO_{3}\![/tex] in this experiment:
[tex]\begin{aligned} & n(\text{${\rm CaCO_{3}}$, theoretical}) \\ =\; & n({\rm CaCl_{2}}) \cdot \frac{n({\rm CaCO_{3}})}{n({\rm CaCl_{2}})} \\ \approx \; & 0.161023\; {\rm mol} \times 1 \\ =\; & 0.161023\; \rm mol\end{aligned}[/tex].
Calculate the theoretical yield of this experiment in terms of the mass of [tex]\rm CaCO_{3}[/tex] expected to be produced:
[tex]\begin{aligned} & m(\text{${\rm CaCO_{3}}$, theoretical}) \\ = \; & n(\text{${\rm CaCO_{3}}$, theoretical}) \cdot M(({\rm CaCO_{3}}) \\ \approx \; & 0.161023\; {\rm mol} \times 100.086\; {\rm g \cdot mol^{-1}} \\ \approx \; & 16.1161\; \rm g \end{aligned}[/tex].
Given that the actual yield in this question (in terms of the mass of [tex]\rm CaCO_{3}[/tex]) is [tex]13.19\; \rm g[/tex], calculate the percentage yield of this experiment:
[tex]\begin{aligned} & \text{percentage yield} \\ =\; & \frac{\text{actual yield}}{\text{theoretical yield}} \times 100\% \\ \approx \; & \frac{13.19\; {\rm g}}{16.1161\; {\rm g}} \times 100\% \\ \approx \; & 81.84\%\end{aligned}[/tex].
What are some medical uses of radiation?
Answer:
Radiation therapy
Explanation:
I hope this helps
If the reaction occurs between Fe2S3(s) and H+ (aq) and the equation is properly balanced with the smallest
whole-number coefficients, what is the sum of the coefficients for all reactants and products?
Fe2S3(s) + H+ (aq)
The sum of the coefficients for all reactants and products is: 12.
Here, we first need to balance the equation of the reaction between Fe2S3(s) and H+.
The chemical equation yields H2S and Fe3+ as follows;Fe2S3(s) + H+ (aq) ------> H2S + Fe3+(aq)Balancing the equation consequently yields;Fe2S3(s) + 6H+ (aq) ------> 3H2S + 2Fe3+(aq)The sum of the coefficients for all reactants and products is therefore;
Sum = 1 + 6 + 3 + 2.
Sum of coefficients = 12
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Zinc chloride can be made from the reaction between zinc oxide and hydrochloric acid. Describe a laboratory method to produce pure dry crystals of zinc chloride. (6 marks)
Suggest an alternative to zinc oxide that could react with hydrochloric acid to give you the desirable product.(1 mark)
Crystallization, followed by filtration to remove excess solution, followed by drying on a watch glass or in a warm oven, can yield pure dry crystals of zinc chloride.
What is crystallization?Crystallization is defined as the formation of a solid in which the atoms or molecules are highly organized into a structure known as a crystal.
It can also be defined as a natural process that occurs when materials solidify from a liquid or precipitate from a liquid or gas.
There are basically three types of crystallization.
Evaporative crystallizationCooling crystallization from solution or the meltReactive crystallization or precipitationFiltration is defined as the process of removing solid particles from a liquid or gaseous fluid by using a filter medium that allows the fluid to pass through but retains the solid particles.
Zinc oxide that could react with hydrochloric acid to give you the desirable product because acid is a neutralizing base, the reaction of hydrochloric acid with zinc oxide to form zinc chloride and water is a neutralization reaction .
Thus, crystallization, followed by filtration to remove excess solution, followed by drying on a watch glass or in a warm oven, can yield pure dry crystals of zinc chloride.
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calculate the number of molecules of hydrogen and carbon present in 4g of methane
[tex]\underline{\boxed{\bf 15.05\times 10^{22} molecules\: of\: Carbon}}[/tex]
[tex]\underline{\boxed{\bf 6.023\times 10^{23} molecules\:of\: Hydrogen}}[/tex]
Refer to the attachment for calculations
nitrogen from a mixture of nitrogen and oxgen
Answer:
Explanation:
The liquid nitrogen and oxygen are then separated by fractional distillation . The liquefied air is passed into the bottom of a fractionating column. Just as in the columns used to separate oil fractions , the column is warmer at the bottom than it is at the top.
Which two seasons are best for growing plants due to the amount of sun received at those times? (Select two.)
winter
summer
autumn
spring
Answer:
spring and summer
Explanation:
Answer:
summer and spring
Explanation:
first one is the answer
Answer:
but where is yr question????
Answer:
Where is your question bro
Please help me with this question it’s really confusing lol.
Answer:
should be earthquake
Explanation:
How large are dwarf galaxies compared to the Milky Way galaxy?
Question 1 options:
the same size
about 1/5 the size
about 1/10 the size
billions of time smaller
Billions of time smaller