Answer:
A protons
Explanation:
the number of protons in the nucleus of every atom of an element is always the same.
A worker paints a 5.2 foot wide crosswalk on a street her boss tells her to make crosswalk 1.25 foot
The question is incomplete. The complete question is :
A worker paints a 5.2 foot wide crosswalk on a street her boss tells her to make crosswalk 1.25 feet wider. How wide is the finished crossroad ?
Solution :
It is given that the worker paints a crossroad on a street whose width is = 5.2 feet.
The boss of the worker asks the worker to make the width of the cross road 1.25 feet more wider.
Thus the required width of the cross road is = 5.2 feet + 1.25 feet
= 6.45 feet.
Therefore the finished cross road is = 6.45 feet wide.
Balance this equation: Ca(OH)2 +
HCI →
CaCl2
+
H20
Answer:
Double Displacement (Acid-Base)
Explanation:
Q3. Which of the following elements is a noble gas?
A Argon
B Chlorine
C Potassium
D Bromine
Answer:
The answer is argon. Pls mark as brainliest
7. A small stone added to boiling liquids to make them boil more evenly without sudden violent releases of
vapours are called
Answer:
A boiling chip, boiling stone, porous bit or anti-bumping granule is a tiny, unevenly shaped piece of substance added to liquids to make them boil more calmly.
These help in making the liquid boil more easily
Answer:
umm i think it's called boiling chip
How many grams of hydrogen gas are produced if 3.0 moles of magnesium are reacted with excess hydrochloric acid?
Answer k
Explanation: better luck
explain why it is more difficult to produce drinking water from waste water than from water in lakes
Answer:
Drinking water can be produced from waste water and from lakes but the difference is in the difficulty of producing water which we can consume.
Drinking water should be clean and toxic free so that if does not affect the human body. Waste water carry more toxic matter in comparison to lake water that's why, producing drinking water from waste water takes more time, expensive and difficult.
So, producing drinking water from waste water is more difficult as it require the removal of more toxic matter than water in lakes.
what does indicator that a chemical change has occurred?
Answer:
change in color or state of matter
Explanation:
hope i helped! ❤❤
Read the list of elements given below.
F, Cl, Br, I
Which of the following about the elements is true?
A. All of them are highly reactive metals
B. All of them are highly reactive nonmetals
C. F and Cl are reactive nonmetals and Br and I are highly reactive metals
D. F and Cl are reactive metals and Br and I are highly reactive nonmetals
Why doesn’t a feather fall at the same rate as an apple?
Can you help me please....
sorry the pic is blocked
The 2s orbital is at n=2. *
True
False
Answer:
Try true
Explanation:
But note I'm not sure
Explanation:
it is true
hope I helped you!! :))
Which type of reaction occurs in the sun to release light and heat?
cohesion
chemical
fission
nuclear
Answer:
The answer is nuclear
Explanation:
The Sun is a main-sequence star, and, as such, generates its energy by nuclear fusion of hydrogen nuclei into helium.
the distribution of electrons in atomic orbital is called
Answer:
electronic configuration
1 point
7) While preparing a temporary mount of cheek cells, teacher asked Rohit
to pick up the stain. He had four bottles A, B, C and D containing Methylene
blue, glycerin, distilled water, Canada balsam respectively. Which one
should he pick? *
А
B
C
D
Write the chemical formula of the following:
(1) Calcium hydroxide.
(2) Magnesium hydroxide.
(3) Aluminum sulphate.
(4) Sodium carbonate.
(5) Zinc phosphate.
(6) Lithium nitrate.
(7) Copper carbonate.
(8) Potassium carbonate.
(9) Magnesium sulphate.
(10) Calcium phosphate.
Answer:
1.Ca(OH)2
2.Mg(OH)2
3.Al2SO4
4.Na2CO3
5.Zn3(PO4)2
6.LiNO3
7.CuCO3
8. K2CO3
9.MgSO4
10.Ca3(PO4)2
is a mirror transparent, translucent, or opaque?
Pls help if you’re good at science I’ll mark brainliest <3
Answer:
B. Extrusive Igneous rock
Balance the equation Ag2O ->Ag + O2
Answer:
For balancing this equation
we need to put
Ag2O. = 2
Ag = 4
O2 = 1
Hope it will help
The balanced chemical equation of decomposition of silver oxide is 2 Ag₂O -> 4 Ag + O₂.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
Learn more about chemical equation,here:
https://brainly.com/question/28294176
#SPJ5
The two basic types of air pollutants are _____.
liquids
invisible
particulates
gases
Answer:
particulates and gases
Explanation:
Why is there a difference in the heating rates of land and water?
Why LED is better option for testing the conduction of electricity?
Answer:
Led is a light-emitting diode, a semiconductor diode that glows when a voltage is applied. So, there is always a sure result of whether a substance conducts electricity or not as the light glows. That is why it is a better option for testing conduction of electricity.
Explanation:
Which is correct ? I’m really confused
Answer:
A. Florine has a stronger pull than Magnesium
Explanation:
Electronegativity refers to the tendency in which an tom would attract electrons to itself.
Below each element in the periodic table is their electronegativity value. Florine has the highest electronegativity value of 4.0.
Going through options;
A. Florine has a stronger pull than Magnesium
Florine = 4.0
Magnesium = 1.2
This correct
B. Hydrogen has a stronger pull than Phosphorus
Hydrogen = 2.1
Phosphorus = 2.1
This is wrong
C. Potassium has a stronger pull than Sodium
Potassium = 0.8
Sodium = 0.9
This is wrong
D. Iron has a stronger pull than Bromine
Iron = 1.8
Bromine = 2.8
This is wrong
what is the molar mass of Mg(NO2)2?
Answer:
116g/mol
Explanation:
Mg=24
NO2=46
multiple 46 by 2and then add 24
The molar mass of Mg(NO₂)₂ is 116.33 g/mol.
To calculate the molar mass of Mg(NO2)2, we need to determine the atomic masses of each element in the compound and multiply them by their respective subscripts.
The atomic masses of the elements involved are:
Mg (magnesium) = 24.31 g/mol
N (nitrogen) = 14.01 g/mol
O (oxygen) = 16.00 g/mol
The compound Mg(NO₂)₂ contains one magnesium atom (Mg), two nitrate ions (NO₂), and each nitrate ion contains one nitrogen atom (N) and two oxygen atoms (O).
Molar mass of Mg(NO₂)₂ :
Mg: 1 × 24.31 g/mol = 24.31 g/mol
N: 2 × 14.01 g/mol = 28.02 g/mol
O: 4 × 16.00 g/mol = 64.00 g/mol
Now, add up the individual masses:
24.31 g/mol + 28.02 g/mol + 64.00 g/mol = 116.33 g/mol
Therefore, the molar mass of Mg(NO₂)₂ is 116.33 g/mol.
Learn more about molar mass here:
https://brainly.com/question/31545539
#SPJ 6
Which statement about energy is correct?
A) A little energy is lost every time an energy transformation occurs.
B) Because of the conservation of energy, it is possible to have a machine that would never need energy.
C) Conservation of energy occurs only when some of the energy is converted to light.
D) Energy can change form, but energy can never change in total amount.
Answer:
B) is true
Explanation:
because in the 24th century that we are now people have created machine that can work without energy
The transfer of energy between systems through work is the expansion of gas in a steam engine. By doing work or by transferring heat, energy can be transferred. Therefore, option B is correct option.
What is energy transfer?
Energy transfer is a phenomenon in which energy transfer from one matter to another matter. energy requirement is necessary to move nay object so work has to be done by the gas to the piston.
Heat can be transferred by three ways radiation, convention or conduction. In conduction, direct contact of two body is necessary for transfer of molecules. Due to the conservation of energy, it is possible to synthesize a machine that would never need energy.
Therefore, the option B is correct option that is because of the conservation of energy, it is possible to have a machine that would never need energy.
Learn more about energy transfer, here:
https://brainly.com/question/18649915
#SPJ2
NaCl + NH3 + CO2 + H20 NaHCO3 + NH4CI
Which Lewis electron-dot diagram correctly represents the reactant containing nitrogen in the equation?
Option (1) represents the Lewis electron-dot diagram correctly containing nitrogen in the equation.
Lewis Structure is a very simplified representation of the valence shell electrons in a molecule. It is used to show how the electrons are arranged around individual atoms in a molecule. Electrons are shown as "dots" or for bonding electrons as a line between the two atoms.
Valence electrons are given by hydrogen atoms = [tex]1\times3=3[/tex]
Valence electrons are given by nitrogen atom = [tex]5\times1=5[/tex]
Total valence electrons = 3 + 5 = 8
So, the calculation above is shown only the first option. So, (1) Lewis electron-dot diagram correctly represents the reactant containing nitrogen in the equation.
To know more about:-
brainly.com/question/20300458
When the zinc atom breaks its bonds with chlorine to make bonds with copper, is it a chemical or physical change?
Answer: it is a chemical change
Explanation:
In an experiment, marble chips reacted with dilute hydrochloric acid and carbon dioxide gas was given
off. The experiment was done twice, once using small marble chips and again with large marble chips.
Look at the graph. Was the total mass of marble chips the same each time?
Answer:
no
Explanation:
Small marble chips reacts faster
****I RLY NEED HELP RN!!! ITS CHEMISTRY AND I AM SOOOO LOST. CAN SOMEONE PLZ PLZ PLZ HELP A GIRL OUT??? I WILL MARK BRAINLIEST, ETC!!!!!
Balance the following chemical equations:
1) AgNO3 + KCl AgCl + KNO3
2) H2O + SO3 H2SO4
3) KI + Cl2 KCl + I2
4) NaHCO3 Na2CO3 + H2O + CO2
5) Zn + HCl ZnCl2 + H2
6) BaCl2 + Na2SO4 BaSO4 + NaCl
Answer:
Explanation:
1. AgNO3 + KCl = AgCl + KNO3
2. SO3 + H2O = H2SO4
3. 2 KI + Cl2 = 2 KCl + I2
4. 2 NaHCO3 = Na2CO3 + CO2 + H2O
5. Zn + 2 HCl = ZnCl2 + H2
6. BaCl2 + Na2SO4 = BaSO4 + 2 NaCl
Answer:
oh no
Explanation:
I would help but I have no clue!!!
I'm so sorry.
Select the correct answer.
What is the chemical formula of trisilicon tetranitride?
A.
Si3N4
B.
Si4N3
C.
Si3N6
D.
Si6N3
E.
Si4N6
Before we can analyze the alum crystal it is
necessary to remove any impurities or
uncrystallized ions that may be present in the
sample. Alcohol must be used because alum
is water soluble.
Answer: TRUE
Explanation:
