Answer:
23 because the atomic number is base on protons and electrons and the neutrons is 20 hope it help
Does light take up space?
Answer:
no
Explanation:
light is a form of energy so it doent have matter therefore it doent take up sapce
Given the unbalanced reaction: NH3 + O2 N2 + H2O. When properly balanced, the sum of the balancing coefficients is 8. 12. 15. 14.
First balance the equation:
4NH3 + 3O2 ↔ 2N2 + 6H2O
Check that the equation is balanced properly by checking the numbers of each element are equal:
LS
N - 1x4 = 4
H - 3x4 = 12
O - 2x3 = 6
RS
N - 2x2 = 4
H - 2x6 = 12
O - 1x6 = 6
Given the equation is balanced properly, we can find the sum of the coefficents by adding.
4 + 3 + 2 + 6 = 15
Therefore, the sum of the coeffiecents is 15.
What type of variable is held constant in an experiment?
Answer:
A variable in an experiment which is held constant in order to assess the relationship between multiple variables, is a control variable.
Explanation:
Write a balanced equation for the complete oxidation reaction that occurs when ethane burns in air
Alkanes are saturated hydrocarbons that have single bonds in chains
General formula for alkanes :
[tex]\tt \large{\bold{C_nH_{2n+2}}[/tex]
Hydrocarbon combustion reactions (specifically alkanes)
[tex]\large {\box {\bold{C_nH _ (_2_n _ + _ 2_) + \dfrac {3n + 1} {2} O_2 \Rightarrow nCO_2 + (n + 1) H_2O}}}[/tex]
So that the burning of ethane with air (oxygen):
[tex]\tt C_2H_6+\dfrac{7}{2}O_2\rightarrow 2CO_2+3H_2O[/tex]
2C₂H₆ (g) + 7O₂ (g) ⟶ 4CO₂ (g) + 6H₂O (ℓ)
or we can use mathematical equations to solve equilibrium chemical equations by giving the coefficients for each compound involved in the reaction
C₂H₆ (g) + aO₂ (g) ⟶ bCO₂ (g) + cH₂O (ℓ)
C : left 2, right b ⇒ b=2
H: left 6, right 2c⇒ 2c=6⇒ c= 3
O : left 2a, right 2b+c⇒ 2a=2b+c⇒2a=2.2+3⇒2a=7⇒a=7/2
A sample of gas has a volume of 10 ml at 2 atm. The pressure increases to 4 atm. What is the new volume?
Answer:
The answer is 5 mLExplanation:
In order to find the new volume we use the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we are finding the new volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
We have
[tex]V_2 = \frac{10 \times 2}{4} = \frac{20}{4} \\ [/tex]
We have the final answer as
5 mLHope this helps you
Which three types of electromagnetic waves have longer wavelengths than the waves that make up visible light?
O radio waves, gamma rays, X-rays
O gamma rays, infrared light, X-rays
O microwaves, radio waves, infrared light
infrared light, ultraviolet light, microwaves
Answer:
O microwaves, radio waves, infrared light
Explanation:
Answer: C. microwaves, radio waves, infrared light
Explanation: C. Microwaves, Radio Waves, Infrared light
An acid-base reaction can also be classified as what "type" of chemical
reaction?
Answer: neutralization reaction
Explanation:
An acid-base reaction is a type of chemical reaction that involves the exchange of one or more hydrogen ions, H+, between species that may be neutral (molecules, such as water, H2O) or electrically charged (ions, such as ammonium, NH4+; hydroxide, OH−; or carbonate, CO32−).
Delta H in chemistry means????
Answer:
In chemistry, the letter "H" represents the enthalpy of a system
Explanation:
can someone actually help me with this?
Question: What is the subatomic composition of technetium-100 (Z = 43), if a cation of Tc has lost three electrons?
i need to find the protons, neutrons, and electrons. :((
Answer:
p = 43, n = 57, e = 40
Explanation:
Z is the number of protons. The number of neutrons, subtract Z from the isotope number (100). To begin with, protons and electrons are equal in an atom, but this atom lost three, so subtract 3 from Z.
Z= # of protons = 43
100 - 43 = 57 neutrons
43 - 3 = 40 electrons.
Explain why the several different types of microscopes are all necessary.
whats the most abundant isotope of silver?
Answer:
Ag-107 has an abundance of 51.82% and mass of 106.9 amu
Explanation:
Answer:
Naturally occurring silver ( 47Ag ) is composed of the two stable isotopes 107Ag and 109Ag in almost equal proportions , with 107Ag being slightly more abundant ( 51.839 % natural abundance ) .
Hope this helps
NEED HELP PLEASE
Part A:
In your own words, describe the process of a physical change.
Part B:
What is the difference between a physical change and a chemical change? Give an example of each.
Answer:
Part A:
A physical change is a change of a substance from one form to another without changing its composition.
Part B:
A physical change is a change of a substance from one form to another without changing its composition. Example: A balloon deflating into its original form.
A chemical change occurs, one substance combines with another substance to make something completely new. Example: Making and baking a cake.
Sciences Grad Bosch Law of Conservation of Mass - Assess it
contents
Target: 10/2001
Science and Enging
Achemical reaction takes place in a closed system. The mass of the reactants before the reaction was
55 watte mass of the products of the reaction be according to the law of conservation
Properties of Matter
Answer:
55
Explanation:
According to the law of conservation properties of Matter in a closed system the mass of reactants is equal to the mass of products. Because there is no lose of matter or energy in closed system
a cylindrical object has a diameter of 1.25 cm and a height of 6.48 cm. what is its volume?
The volume of cylinder = 7.948 cm³
Further explanation
Volume is a derivative quantity derived from the length of the principal
The unit of volume can be expressed in liters or milliliters or cubic meters
The volume of the aquarium is almost the same as the beam namely:
V = length x width x height
The volume of a cylinder can be formulated :
[tex]\tt V=\pi.r^2.h[/tex]
r = radius
h = height
radiusDiameter of cylinder = 1.25 cm
radius=r :
[tex]\tt \dfrac{1.25}{2}=0.625~cm[/tex]
volume[tex]\tt V=\pi\times 0.625^2\times 6.48\\\\V=\boxed{\bold{7.948~cm^3}}[/tex]
An atom is the simplest substance known and provides the building block from which all matter is composed.
True or false
What is the oxidation number of Gallium?
Answer: +3
Explanation: Gallium liquefies just above room temperature. Gallium is a soft solid, however it quickly becomes liquid when heated.
How many atoms are there in 4.13 moles of nickel (Ni)
Answer:
2.48626 x 10^24
Explanation:
We multiple 4.13 by avogadro's number to get that.
How many carbon atoms are there for every 2 oxygen atoms in CO2? A. 1 B. 2 C. 3 D. 4
Answer:
I think it's 1, but if that's wrong I'm really sorry
The chemical formula for glucose, a type of sugar, is C 6H 12O 6. Which statement is true about glucose?
Answer:
The answer is C, Glucose is a compound, because it is made of more than one element.
Explanation:
Complete Question is ;
The chemical formula for glucose, a type of sugar, is C₆H₁₂0₆. Which statement is true about glucose?
1) Glucose is a compound because it's made from more than 1 element
2) Glucose is an element because it's made up from more than one kind of atom.
3) Glucose is an element because it can be separated.
4) glucose is a compound because is made of protons, neutrons and electrons
Solution ;
The statement which is true about glucose is (1) Glucose is a compound because it's made from more than 1 element. Hence the correct option is (1)
What is an Element ?Aan element made entirely of one species of atoms, or an atom which has a specific number of protons in its nucleus.
Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules.
Three substances make up glucose: carbon, hydrogen, and oxygen. They are set at a fixed ratio of 1:2:1.
Covalent bonds, in which two atoms share bonding valence electrons in one or more bonds, are used to bind these atoms together.
Therefore, The statement which is true about glucose is (1) Glucose is a compound because it's made from more than 1 element. Hence the correct option is (1)
learn more about Compound here ;
https://brainly.com/question/19458442
#SPJ6
Which of the following elements form +1 ions?
A sodium, magnesium, aluminum
B strontium, magnesium, calcium
C lithium, sodium, potassium
Answer:
It is 'A' i.e., Sodium magnesium, aluminium
Elements tend to lose and gain electrons to achieve electronic stability. Lithium, sodium, and potassium are the elements that form +1 ions. Thus, option C is correct.
What are cations?Cations are said to be the ions formed by donating their outermost valence electron that in return results in a positive charge on the element. Cations are said to be formed when the electron is more in number in the valence shell.
The electronic configuration is given as:
Lithium - 2, 1Sodium - 2, 8, 1Potassium - 2, 8, 8, 1Here, there is one electron extra in the outer shell of the atom that can be donated to other atoms that are called anions (electron acceptors). Li, Na, and K can donate one electron each and hence will acquire a +1 charge.
Therefore, option C. lithium, sodium, and potassium form a +1 charge.
Learn more about cations, here:
https://brainly.com/question/1333307
#SPJ2
Which of the following is the least likely to remain homogeneous?
. O A. All of these
O B. A supersaturated solution
O C. An unsaturated solution
O D. A saturated solution
Answer:
all
of them
Explanation:
Classify the following reactions and complete the given below
A) NaCl + AgNO3 - NaNO3 + AgCl
Answer:
chemical equation balance.
Explanation:
if you need more explanation , comment.
How many neutrons does protium have?
Explain why warm air temperature has lower air pressure than cold air?
Answer:
Differences in temperature cause differences in air density. Warmer air is less dense than cold, which is why warm air tends to rise and cold air sinks.
temparature affects particles. warm particles are more spread out.
Explanation:
. Being acted on by gravity, colder, denser air weighs more and exerts greater pressure per unit area.
An increase in which of the following would increase the boiling point of a
liquid?
Answer:
The boiling point increases with increased pressure up to the critical point, where the gas and liquid properties become identical.
A black rock has a mass of 12.5 grams. When dropped into a graduated cylinder, the volume rises from 20 ml to 24 ml. What is the density of the rock?
Answer:
3 g/mL
Explanation:
Density is mass divided by volume (g/mL).
Mass of rock = 12.5
Volume of rock = 24-20 = 4mL
Density of rock = 12.5g/ 4mL = 3.125 g/mL
Round to the lowest number of significant figures which is 1 to get 3 g/mL
What is the difference between the crest and the trough of a wave?
Answer:
Trough is the lower bound of wave, while the crest is the upper bound of a wave.
Explanation:
see picture attatched
QUICK I’ll GIVE BRAINLIEST
The number of isomers of C5H12 is:
Select one:
a. 4
b. 2
c. 5
d. 3
Answer:
The answer is option D 3
Explanation:
please mark as brainliest
Answer:
d.3
Explanation:
When an electron beam strikes a block of copper, x-rays of frequency 6 x 10^18 Hz are emitted. What is the wavelength of these x-rays? Answer in units of pm.
Answer:
0.5×10² pm
Explanation:
Given data:
Frequency of x-ray = 6×10¹⁸ Hz
Wavelength of x-ray = ?
Solution:
Wavelength is designated as "λ" and it is the measured in meter. It is the distance between the two crust of two trough.
Formula:
speed of wave = wavelength × frequency
speed = 3×10⁸ m/s
now we will put the values in formula.
3×10⁸ m/s = λ × 6×10¹⁸ Hz
Hz = s⁻¹
λ = 3×10⁸ m/s / 6×10¹⁸ s⁻¹
λ = 0.5×10⁻¹⁰ m
m to pm
0.5×10⁻¹⁰ m × 10¹² pm/1m
0.5×10² pm
Someone help me quick! Will give brainliest
Answer:
WHY DO YOU NEED HELP HUH
DON'T CHEAT READ AND STUDY
Explanation:
Answer:
It's C
Explanation:
