Answer:
Electronegativity increases from left to right within a row of the periodic table
Explanation:
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.
Question 25 of 30
Which statement best describes what happens when thermal energy of the
air around a fire is transferred to the surrounding air?
O A. The thermal energy is spread out by the surrounding air.
O B. The thermal energy is destroyed as it changes to chemical energy.
C. The thermal energy is destroyed over time.
ОО
D. The thermal energy changes to chemical energy.
SUBMIT
Answer: The thermal energy is spread out by the surrounding air.
Explanation:
got it right on test
What makes physical change a physical change and a chemical change a chemical change
Answer:
A physical change is reversible and the changes made are only physical (smell, physical state, volume, etc) and most importantly no new substance is formed. In a chemical change, a new substance is formed, the chemical properties are changed, and it's permanent.
How many grams of sodium are contained in 4moles of na2co3
Answer:
424 grams of sodium are contained in 4moles of na2co3
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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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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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:
can you solve these?
Answer:
yes
Explanation:
it's easy
A 17.5 mL portion of a 0.1050 M Na2CO3 solution is added to 46.0 mL of 0.1250 M NaCl. What is the concentration of sodium ion in the final solution?
The sodium ion concentration in the solution of 17.5 mL of 0.1050 M Na₂CO₃ and 46.0 mL of 0.1250 M NaCl is 0.148 M.
To find the Na⁺ concentration in the final solution, we need to find the number of moles of the ion in the Na₂CO₃ and NaCl solutions and the volume of the final solution.
[tex] C_{Na^{+}} = \frac{n_{t}}{V_{t}} [/tex] (1)
Where:
[tex] n_{t} [/tex]: is the total number of moles of Na⁺
[tex] V_{t} [/tex]: is the volume of the final solution
The number of moles of Na⁺ in the Na₂CO₃ solutionThe number of moles of Na₂CO₃ can be calculated as follows:
[tex] n_{Na_{2}CO_{3}} = C_{Na_{2}CO_{3}}*V_{Na_{2}CO_{3}} [/tex]
Where:
[tex] C_{Na_{2}CO_{3}} [/tex]: is the concentration = 0.1050 mol/L
[tex] V_{Na_{2}CO_{3}} [/tex]: is the volume = 17.5 mL = 0.0175 L
[tex] n_{Na_{2}CO_{3}} = 0.1050 mol/L*0.0175 L = 1.84 \cdot 10^{-3} \:moles [/tex]
We can find the number of moles of Na⁺ knowing that in 1 mol of Na₂CO₃ we have 2 moles of Na⁺.
[tex] n_{Na^{+}} = \frac{2 \:mol\: Na^{+}}{1\:mol \:Na_{2}CO_{3}}*mol \:Na_{2}CO_{3} = \frac{2 \:mol\: Na^{+}}{1\:mol \:Na_{2}CO_{3}}*1.84 \cdot 10^{-3} \:moles = 3.68 \cdot 10^{-3} \:moles [/tex]
The number of moles of Na⁺ in the NaCl solutionThe number of moles of Na⁺ in the NaCl solution is:
[tex] n_{NaCl} = C_{NaCl}*V_{NaCl} = 0.1250 mol/L*0.046 L = 5.75 \cdot 10^{-3} \:moles [/tex]
In 1 mol of NaCl we have 1 mol of Na⁺, so the number of moles of Na⁺ in the NaCl solution is 5.75x10⁻³ moles.
Total number of moles of Na⁺The total number of moles of Na⁺ in the final solution can be calculated as follows
[tex] n_{t} = n_{{Na^{+}}_{Na_{2}CO_{3}}} + n_{{Na^{+}}_{NaCl}} = 3.68 \cdot 10^{-3} \:moles + 5.75 \cdot 10^{-3} \:moles = 9.43 \cdot 10^{-3} moles [/tex]
Hence, the number of moles of Na⁺ in the final solution is 9.43x10⁻³ moles.
The volume of the final solutionThe volume of the final solution is given by:
[tex] V_{t} = V_{Na_{2}CO_{3}} + V_{NaCl} = 0.0175 L + 0.046 L = 0.0635 L [/tex]
Concentration of Na⁺ in the final solutionThe concentration of Na⁺ in the final solution is (eq 1):
[tex] C_{Na^{+}} = \frac{n_{t}}{V_{t}} = \frac{9.43 \cdot 10^{-3} moles}{0.0635 L} = 0.148 mol/L [/tex]
Therefore, the concentration of sodium ions in the final solution is 0.148 M.
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https://brainly.com/question/6341703?referrer=searchResultshttps://brainly.com/question/1386691?referrer=searchResultsI hope it helps you!
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
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:
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
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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0.250 moles of NaCl is dissolved in 0.850 L of solution. What is the molar concentration?
Considering the definition of molarity, the molar concentration is 0.294 [tex]\frac{moles}{liter}[/tex].
Molarity reflects the concentration of a solution indicating the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:
[tex]molarity=\frac{amount of moles of solute}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
In this case, you know:
amount of moles of solute= 0.250 molesvolume= 0.850 LReplacing in the definition of molarity:
[tex]molarity=\frac{0.250 moles}{0.850 L}[/tex]
Solving:
molarity= 0.294 [tex]\frac{moles}{liter}[/tex]
Finally, the molar concentration is 0.294 [tex]\frac{moles}{liter}[/tex].
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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:
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
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:
which ionic equation represents the reaction taking place at anode during the electrolysis of molten aluminium oxide?
Explanation:
at the Anode, Oxide ions lose electrons and produce Oxygen gas
Hope U will like the answer and be very enthusiasm to meet with me to have se*
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.
calculate the gravimetric factor of Fe in Fe2O3
i hope this calculation will help you
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!
Formula for gallium peroxide
Answer:
Ga₂O
Explanation:
first one is the answer
Answer:
but where is yr question????
Answer:
Where is your question bro
What are some medical uses of radiation?
Answer:
Radiation therapy
Explanation:
I hope this helps
Who is most likely associated with the quote below?
“Nothing exists except atoms and empty space; everything else is opinion."
А: Democritus
B: Aristotle
C: Thales
D: Epicurus
Answer:
democritus
Explanation:
i looked it up
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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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
Please help me with this question it’s really confusing lol.
Answer:
should be earthquake
Explanation:
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.