Answer:
hydrogen
Explanation:
1
H
1
hydrogen
magnesium
O Which of the following determines the
identity of an element?
a. atomic number
b. mass number
c. atomic mass
d. Overall changes
Answer:
A. atomic number
Explanation:
the mass number alone cannot uniquely identify an element. But the number of protons in the nucleus identifies it uniquely. In addition, if the atom is neutral, then the atomic number also equals the number of electrons in its orbitals.
Someone pls help me With this I will make you as brain
Answer:
C
Explanation:
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:
Which represents an empirical formula?
a)C2H4
b)B2H6
c)Al2O3
d)C6H6
Answer:
C. Al2O3
Explanation:
The empirical formula is an expression that represents the simplest proportion in which the atoms that form a chemical compound are present. It is therefore the simplest representation of a compound.
For options A, B and D the empirical formulas are as follows:
A. CH2
B. BH3
D. CH
find the atomic numbers of the as yet undiscovered next two members of the series.
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
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:
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.
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.
Which words describe the image below? CHECK ALL THAT APPLY.
A.)liquid
B.)solid
C.)gas
please help!
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
Someone pls help me With this I will make you as brain
Help me fill in all the blanks I’m not sure if I’m doing this correctly
Match the following scientist with his experiment or contribution
J. J. Thomson
Albert Einstein
Niels Bohr
Ernest Rutherford
John Dalton
Robert Millikan
___________________ Oil-drop experiment
___________________ Atomic theory
___________________ Cathode ray experiment
___________________ Model of the atom
___________________ Gold-foil experiment
___________________ Photoelectric effect
PLEASE HELP!!!!!
J. J. Thomson - oil drop
Albert Einstein - atomic theory
Niels Bohr - model of the atom
Ernest Rutherford - gold foil experiment
John Dalton - cathode ray tube
Robert Millikan - photoelectric effect
The correct match of the scientists with their experiment or contribution are:
J. J. Thomson - oil dropAlbert Einstein - atomic theoryNiels Bohr - model of the atomErnest Rutherford - gold foil experimentJohn Dalton - cathode ray tubeRobert Millikan - photoelectric effectWho are scientists?Scientists are those people who research in different fields, and they do discoveries of new things. They study nature and every fill for the earth to know more, and they discover and open new secrets of the earth to the people.
Albert Einstein is a famous scientist that discovered relativity and the photoelectric effect. Neil Bohr explained the model of an atom, by which every matter is made up of.
Thus, the correct match is :
J. J. Thomson - oil dropAlbert Einstein - atomic theoryNiels Bohr - model of the atomErnest Rutherford - gold foil experimentJohn Dalton - cathode ray tubeRobert Millikan - photoelectric effectTo learn more about scientists, refer to the below link:
https://brainly.com/question/957656
#SPJ2
what is the frequency of 704 nm light?
Explanation:
Sorry pa Wala. Thank God
How does nitrogen return to the soil?
photosynthesis by plants
absorption by the soil
precipitation by rain
decomposition by bacteria
Answer:
photosynthesis by plant
Explanation:
when plants like lugumes are in a process of fertilization,the suck the nutrugen from the air with help from their Noddles found on their roots.
Answer:
decomposition by bacteria
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.
how many grams are equal to 413 kg. [?]x10^([?])g
413000 grams thats the answer hope that helps ;]
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
1. In the process of convection, heat travels
a.from side to side
b.upwards
c.downwards
d.in all direction
Answer:
option d in all direction
Explanation:
very firstly you have to understand that what is convection convection is a process of heat transfer which is takes place due to molecules and you know moleculescan easily travels with any sites from side to side upwards or downwards so the answer will be in all directionPlease help, I need help with this question
Answer:
Flourine
chlorine
bromine
iodine
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.
In the notations C-12 and C-14, what do the numbers after the element
symbol and hyphen represent?
trash photo again but the middle question is answered i just need the top and bottom question answered :)
Answer: ok
Explanation: i agree
how does density and flammability explain how carbon dioxide could be coming from the bath bomb?
The melting point is 152.7 C°, the boiling/decomposing point is 310 C°, and the density is 1.665 g/cm³. How are Bath bombs made? Baking soda is derived from soda ash.
phân tử khối của MnO4
Answer:
Phân tử khối của MnO4 = 55 + 16 x 4 = 119 ( đvC )
Explanation:
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
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
Answer question will give brainliest
Explanation:
Elastic Potensial energy is what causes a ball to bounce or rebound because it is transformed into kinetic energy, which is then used to bring the ball back up.