Cho muối X vào dd NaOH, đun nóng, thu được một chất khí làm xanh giấy quỳ ẩm. Chất nào sau đây thỏa mãn tính chất của X?
A.K2SO4 B.NH4NO3 C.CaCO3
D.FeCl2
Answer:c
Explanation:
give reason : Inert gas shows least reactivity
pls help
Answer:
Noble gases also known as inert gases are the least reactive of all known elements because with eight valence electrons, their outer energy levels are full. As a result, noble gases cannot become more stable by reacting with other elements and gaining or losing valence electrons. Therefore, noble gases are rarely involved in chemical reactions and almost never form compounds with other elements.
Explanation:
The only exception is helium, which has just two electrons. But helium also has a full outer energy level, because its only energy level (energy level 1) can hold a maximum of two electrons. A full outer energy level is the most stable arrangement of electrons.
Answer the question below based on the periodic table entry for silicon.
What is the atomic mass?
14
28.08
2
28
Answer:
28
Explanation:
the atomic mass is the name that a downward under the element
QUICK!! 2NaN3 —> 2Na + 3N2
this equation is balanced, but why does the N in the reactant have a subscript of 3, and the N in the product has a subscript of 2.
why did the subscript change? from what i learnt, when you balance an equation, you can only use coefficients to balance the equation.
Answer:
-Before balancing the equation, you need to determine the index of the components in the substances correctly to balance
-Between two atoms in the molecule N2 forms a stable triple bond, so nitrogen gas is denoted N2.
-Nitrogen in compounds with sodium carries a charge of -3, and sodium has a charge of +1 in all compounds, so we get NaN3
Explanation:
answer from VNese, used GGtranslate
In a varve, summer is represented by _____.
sediment from melting glaciers being deposited in lakes
clay from wind-blown dust
ash from nearby volcanoes
None of these
Answer:
sediment from melting glaciers being deposited in lakes
Explanation:
I took the test
3. How did your hypothesis work out? What was surprising in this experiment?
someone help please
Answer:
Whats the hypothesis and the experiment?
Explanation:
I cant really help without context
phân tử khối của MnO4
Answer:
Phân tử khối của MnO4 = 55 + 16 x 4 = 119 ( đvC )
Explanation:
Describe how the properties of elements in the same group differ to the properties of elements in the same period.
Answer:
All the elements of a group have similar chemical properties because they have same no. of valence electrons in their outermost shell.
All the elements of a period have different chemical properties because they have different no. of valence electrons in their atoms.
Answer:
4
Explanation:
Same group elements have the same physical properties and same elements in period have same chemical properties
The temperature of the ideal gas in the container shown is 300k. The gas occupies a volume of 1.27. What would be the volume of the gas if it’s temperature were decreased to 100k?
Answer:
0.432
Explanation:
The temperature of the ideal gas in the container shown is 300K. The gas occupies a volume of 1.27. What would be the volume of the gas if it’s temperature were decreased to 100K?
At 100K the particles are moving 1/3 as fast as 300K so the volume would be
1/3 X (1.27) =0.423
Directions: Answer the questions below. Write your answer on the space provided for each number.
1. Draw a schematic diagram of a series and parallel circuit
2. How are the appliances connected in your house? Identify which among these are connected in series? In parallel?
3. Which is said to be the more efficient connection to use at home? Series or Parallel? Explain your answer.
Please help me with this ill mark brainliest please please im literally crying here
Answer:
B)
Explanation:
The mass remains the same before the reaction and after. A chemical reaction takes place when vinegar and baking soda are mixed. One of the new substances formed is carbon dioxide gas. If the carbon dioxide gas is contained, the mass of the substances will stay the same according to the Law of Conservation of Mass
Answer:
B is the correct option.
Explanation:
The system is a closed one because Alison closed the container with a balloon immediately. With this mass can't change and law of conservation of mass states in chemical change, mass in neither created nor destroyed.
How many protons, neutrons, and electrons make up an ion of
radium-208 that has a +2 charge?
Answer:
proton=88
electron=88
neutron=138
Using the diagram below, which global winds are moving at points 1 and 6?
Question options:
Prevailing westerlies
Trade Winds
Polar Easterlies
Doldrums
Answer:
Polar Easterlies
Explanation:
Answer:
prevailing westerlies
What force must act on a 30 kg mass object to give it an acceleration of 0.45 m/s²?
PLSS HELPP MEE THE SUBJECT IS SCIENCE
Explanation:
Force=mass×acceleration
F=m×a
F=30×0.45= 13.5N
hope this helps you.
Help me fill in all the blanks I’m not sure if I’m doing this correctly
How to Represent nitrogen and magnesium with the Bohr-Rutherford model?
Nitrogen: 2 electron shells and 5 valence electrons
Magnesium: 3 electron shells 2 valence electrons
trash photo again but the middle question is answered i just need the top and bottom question answered :)
Answer: ok
Explanation: i agree
How many grams of water can be heated 75.0 celsius by the absorption of 40.0 kcal?
Answer:
8.9
Explanation:
Help with question 01.4 pleaseeee
Answer:
Is there answer choices?
Explanation:
4Hg(OH)2+ H3PO4 —> Hg3(PO4)2 + 5H20
Is this equation balanced or not? Give a full explanation and I’ll mark as brainliest too
Answer:
Not balanced.
Explanation:
It a double displacement reaction of a base and acid. The balanced equation is:
3Hg(OH)2 + 2H3PO4 → Hg3(PO4)2 + 6H2O
Someone pls help me With this I will make you as brain
Answer:
C
Explanation:
Which is a TCS food?
Answer:
Food from plant origin that is cooked such as rice, potatoes and pasta.Food from animal origin that is raw, cooked or partially cooked
Explanation:
i searched it up
Explanation:
TCS foods are foods that requires time and temperature controls to limit the growth of illness causing bacteria.
find the atomic numbers of the as yet undiscovered next two members of the series.
Someone pls help me With this I will make you as brain
Which words describe the image below? CHECK ALL THAT APPLY.
A.)liquid
B.)solid
C.)gas
please help!
Please help, I need help with this question
Answer:
Flourine
chlorine
bromine
iodine
A sample of gas is measured to be 375 ml at 1.15 atm. The pressure
is increased to 2.05 atm. What is the new volume?
Answer:
Direct method:
1.15x375/2.05
=21.03mL
Which common substance is a base?
Question 4 options:
vinegar
lemon juice
yogurt
ammonia
Answer:
AMMONIAExplanation:
HOPE IT HELPS!!!!!
Answer:
Ammonia is a base.
Explanation:
Vinegar, lemon juice, and yogurt all have a pH under 7. If a substances pH is under 7 then it is acidic. If it is above 7 then it is a base. Ammonia has a pH above 7 therefore it is a base.
how many grams are equal to 413 kg. [?]x10^([?])g
413000 grams thats the answer hope that helps ;]
history of atomic structure
Matter is composed of indivisible building blocks. This idea was recorded as early as the fifth century BCE by Leucippus and Democritus. The Greeks called these particles atomos, meaning indivisible, and the modern word “atom” is derived from this term. Democritus proposed that different types and combinations of these particles were responsible for the various forms of matter. However, these ideas were largely ignored at the time, as most philosophers favored the Aristotelian perspective.