Answer:
An equal force acts in the opposite direction.
Explanation:
Jasmin is planning to attend a softball game today. She is watching the weather forecast and notices a large "L" on the weather map for her area. What prediction can be made about the weather?
Its Science
Answer:
The softball game will still go on because the "L" symbolizes a low pressure system which usually brings sunny weather.
Explanation:
how many protons does boron-11 atom have
Answer:
5
Explanation:
pliz answer 1 & 2 .... I'll tag best answer brainliest .... no spamming
1,chlorine ions
2,sodium chloride
what is change in science??
Answer:
A transition from one accepted theory to another or from one employed method to another.
Explanation:
cacs hạt cấu tạo nên hầu hết cac nguyên tử là
Please help with chemistry!
Answer:
name is Ian symbol is spices mass number is 100
Explanation:
#
earth has two movements in space what are they called ?
Studying the brightness of a star can help scientist determine what part of the life-cycle a star is in. Is this true or false
Answer:
what do you mean?
Explanation:
Studying the brightness of a star can indeed help scientists determine what part of the life-cycle a star is in. The brightness of a star is directly related to its stage in the life cycle.The statement is true.
During the early stages of a star's life, it is formed from a cloud of gas and dust. As the star contracts under its own gravity, it starts to heat up and emits light. This is known as the protostar stage.
As the star continues to contract, it reaches a point where the core temperature becomes hot enough for nuclear fusion to occur. At this stage, the star enters the main sequence phase, where it will spend the majority of its life. The brightness of the star in this phase is determined by its mass. More massive stars are brighter than less massive ones.
As the star ages, it exhausts its hydrogen fuel in the core and begins to evolve. Depending on its mass, a star can become a red giant, a white dwarf, a neutron star, or even a black hole. Each of these stages has a different brightness profile.
By observing the brightness of a star over time, scientists can gather information about its age, mass, and evolutionary stage. This can provide insights into the star's life cycle and help in understanding the processes occurring within it.
Thus, studying the brightness of a star is an important tool for scientists to determine what part of the life cycle a star is in. By analyzing its brightness profile, scientists can gain valuable information about the star's age, mass, and evolutionary stage.The statement is true.
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Why is boiling water considered a physical change
What are two or more atoms linked/bonded together called?
Answer:
Molecule
Explanation:
Two or more atoms linked/bonded together is called a molecule.
10/4/2021
the total number of protons and neutrons in the nucleus
of an atom
a) atomic mass unit
b) mass number
c) atomic number
d) atomic mass
Answer:
atomic number
Explanation:
Is fresh squeezed lemonade a homogeneous or heterogeneous mixture
Answer: This makes the lemonade a homogenous mixture
Explanation:
If the freshly squeezed lemonade is made by squeezing lemons to extract the sour juice and mixing this with water and sugar all the substances in the mixture finally created are in the same phase.
During photosynthesis,blank energy is transformed into blank energy
Answer:
I am also beginners I don't know I am only completing this answer and sorry!!!!!!
Answer:
Solar Energy and Chemical energy
Explanation:
Based on Periodic Law, how is the Periodic Table arranged?
Answer:
Elements of the periodic table are arranged in order of increasing atomic number. the periodic law states "when elements are arranged in increasing atomic number, there is a periodic repetition of their chemical and physical properties."
Explanation:
Neon consists of three isotopes: Neon-20 with a mass of 19.992 amu and an abundance of 90.48%, Neon-21with a mass of 20.994 amu and an abundance of 0.27%, and Neon-22 with a mass of 21.991 amu and an abundance of 9.25%. Determine the average atomic mass of Neon:
why do you think that sodium chloride has to be heated to 800c before melting, but candle wax will start to melt at 50c?
Answer:
Sodium chloride is an ionic compound which makes it stronger and have a higher melting and boiling point. Candle wax is a covalent compound so it has a low melting point.
Explanation:
PLEASE MARK AS BRAINLIEST!!!!!plsss help I really need it:(((
Answer:
12. A
13. A
14. D
15. B
Explanation:
12. The 3rd law of motion is the force of our object being equal and opposite the other. If the Buller goes forward with force, the the gun recoils backwards with the same force.
13. There's nothing else described in the problem besides him getting kicked in the face
14. If you mive the oars forwards then the boat itself moves backwards
15. The gas helps push the rocket upwards since it goes downwards.
What law states that matter cannot be created nor
destroyed, even in a chemical reaction?
A
Newton's Laws of Motion
B
Law of Conservation of Mass
Answer:
I believe it would be Law of conservation of mass (sorry if I'm incorrect)
what is the name of the ionic compound made of beryllium and chlorine?
Answer:
beryllium chloride
Explanation:
Therefore a compound made from beryllium and chlorine will be named beryllium chloride.
a) What is the role of neutrons in an atom?
b) How do we determine how many neutrons are in an atom?
Answer:
numer 1:Neutrons are required for the stability of nuclei, with the exception of the single-proton hydrogen nucleus. Neutrons are produced copiously in nuclear fission and fusion. They are a primary contributor to the nucleosynthesis of chemical elements within stars through fission, fusion, and neutron capture processes.
number 2:The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).let me know if i helped
The atomic number of oxygen is 8. The mass number of an atom of oxygen is 17. Describe the number and type of particles in the nucleus of this atom.
Answer:
protons: 8
neutrons: 9
Explanation:
the atomic number tells you how many protons are in a element. The mass is the number of protons + neutrons.
17 - 8 = 9 neutrons
There are 8 protons and 9 neutrons in the nucleus of the oxygen atom.
What is the atomic number and mass number of an atom?The atomic number of an atom is the number of protons in atom of an element.
It can also be defined as the number of electrons in a neutral atom of an element.
The mass number is the number of protons and neutrons in the nucleus of an atom of an element.
The proton number of the oxygen atom is 8
The neutron number is 17 - 8 = 9
Therefore, in the nucleus of the oxygen atom, there are 8 protons and 9 neutrons.
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Anyone help me answer this please anyone
Answer:
[tex]\huge\boxed{\sf Q = 5880\ Joules}[/tex]
Explanation:
Given:
m = mass = 40 g = 0.04 kg
c = specific heat constant of water = 4200 J/Kg°C
ΔT = change in temperature = T2-T1 = 60 °C - 25 °C = 35°C
Required:
Q = change in heat energy = ?
Formula:
Q = mcΔT
Solution:
Q = (0.04)(4200)(35)
Q = 5880 Joules
[tex]\rule[225]{225}{2}[/tex]
How many grams of Fe can be produced when 6.10 g of Fe2O3 reacts?
As per the balanced reaction, two moles or 319.4 g of Fe₂O₃ gives 4 moles or 223.4 g of Fe. Thus 6.10 g gives 4.22 g of Fe.
What is ferric oxide?
Ferric oxide is an ionic compound formed from iron and oxygen in which iron is in +3 oxidation state. It is also called iron oxide which decomposes to form molecular oxygen and iron.
The balanced equation giving Fe and oxygen from ferric oxide is written below:
[tex]\rm 2Fe_{2}O_{3} \rightarrow 4Fe + 3O_{2}[/tex].
The molar mass of ferric oxide is 159.7 g/mol. Thus two moles weighs 159.7 × 2 = 319.4 g. Atomic mass of Fe is 55.85 hence, 4 moles is 223.4 g.
As per the balanced reaction, 319.4 g of ferric oxide gives 223.4 g of iron. Thus mass of iron , Fe produced from 6.10 g of ferric oxide is calculated as follows:
mass of Fe = (223.4× 6.10 ) /319.4
= 4.226 g
Hence, 4.22 g of Fe will be produced from 6.10 g of Fe₂O₃.
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is this statement true or false? the chinese knew how to produce silk by about 2700 b.c.
Answer:
its true
Explanation:
I took the test
Can someone help me with this
Answer: It would be malleable, solids, luster, conductors, reactive
Explanation:
atoms from different element combine to form
Answer:
new substances
Explanation:
Atoms of different elements can combine to make new substances. A molecule is formed when two or more atoms join together chemically. If atoms combine that are of two or more different elements, we call that a compound. All compounds are molecules, but not all molecules are compounds.
the mixing of which pair of reactants will result in a precipitation reaction?
Answer:
NH4Br and NH4I are both soluble in water, and they don't react with each other. So this pair will not form precipitation.
NaClO4 and (NH4)2S are both soluble in water. While in water, they dissociate into Na+, ClO4-, NH4+ and S2- ions, which don't react with each other. So this pair will not form precipitation.
Ni(NO3)2 and Na2CO3 are both soluble in water. When the 2 solutions combine, NiCO3 forms. NiCO3 is not soluble in water, so it will precipitate out from the solution. This pair will result in precipitation.
K2SO4 and Cu(NO3)2 are both soluble in water. While in water, they dissociate into K+, SO42-, Cu2+ and NO3- ions, which don't react with each other. So this pair will not form precipitation.
Explanation:
Hope this helps...
What is the correct name for Fe203?
A Iron(V) oxide
B Iron(III) oxide
C Iron(I) oxide
D Iron(II) oxide
Answer:
The answer would be B.
Explanation:
how many oxygens are used per glucose molecule in glycolysis?
Answer:
0
Explanation:
How many cm of a solution of 0.100 mol dm NaOH are required to completely -3 neutralize 25.0 cm of 0.250 mol dm H3PO4?. a) Write a balanced equation for the reaction (4 marks) b) How many moles of H3PO4 need to be neutralized? (1 marks) c) How many moles of NaOH are needed to neutralize the H3PO4? (1 marks) d) How many cm of 0.100 mol dm NaOH contain the moles in question 5(©) above? (1 marks)
Answer:
Explanation:
How many cm of a solution of 0.100 mol dm NaOH are required to completely neutralize 25.0 cm of 0.250 mol dm H3PO4?.
a) Write a balanced equation for the reaction NaOH to neutralize (4 marks
?. ) 25.0 cm of 0.250 mol dm H3PO4
H3PO4 + 3NaOH----------> Na3PO4 +3 H2O
b) How many moles of H3PO4 need to be neutralized? (1 marks)
25.0 cm3 of 0.250 mol dm3 H3PO4: 1 liter has 0.25 moles. 100 ml has 0.025 moles 25 ml has o.025/4 molea or 0.00625 moles)
c How many moles of NaOH are needed to neutralize the H3PO4? (1 marks)
for every moles of H3PO4, WE NEED 3 MOLES OF NaOH. FOR 0.00625 MOLES WE NEED 3X 0.00625 =0.01875 MOLES OF NaOH
d) How many cm3 of 0.100 mol /l NaOH contain the moles in question 5(©) above? (1 marks)
1 L CONTAINS 0.100 Moles
100 ml contains 0.010Moles
we need 187.5 ml since (187.5 X 0.100)/1000=0.01875
