Answer:
10 neutrons
Explanation:
N=Z-A ie. number of neutrons=mass number-atomic number
N=19-9=10
(ASAP PLEASE HELP!! Another one) Which of the following has the lowest pH/most acidic?
NH3
НСІ
HON
H20
NaOH
Answer:The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic.
Explanation:
Complete the sentence!
Organisms in an ecosystem compete for _____. (Select all that apply).
A : shelter
B : water
C : food
D : space
Answer:
I personally think it would be all of the above
Q1 and Q1 represent ?
Answer:yes they do represent
Which of these reactions shows simple chemical decomposition?
I2 + 2NaCl → 2Nal + Cl2
NaF + HCl → HF + NaCl
H2 + I2 → 2HI
2NaCl → 2Na + Cl2
Answer:
last option is the correct answer
Explanation:
you can see that the chemical NaCl is decomposed or broken into its components Na and Cl.
all other equations have formation of a new compound by reaction of 2 elements or compound
shakajskwbskam help?
Answer:
beta
Explanation:
Qert + 9wz - asd + 10
Answer:
yes
Explanation:
7. What is the missing part of this fusion equation?
What is the missing part of this fusion equation?
2 1H+? → 3 2He + 1 0 n
Select the correct answer. Use the periodic table to help you.
1) 3 1 н
2)3 2 Не
3) 2 1 0n
4)2 1 H
Answer:
2 1 H
Explanation:
We must remember that a nuclear equation is only said to be balanced when the mass and charges on both sides of the nuclear reaction equation correspond.
If we look at the nuclear equation; the total mass on the right hand side is 4 units while the total charge on the right hand side is two units.
This implies that the missing particle must be 2 1 H
What can a drop of liquid mercury be described as?
a pure substance and a compound
an impure substance that is reactive
an impure substance that is unreactive
a pure substance and an element
Answer:
a pure substance and an element”
Explanation:
Question 27
How many molecules are in 28 g of CO2?
O 3.5 x 10-21
O 7.42 x 1026
3.83 x 1023
O 3.8 x 1044
Answer:
3.83x10^23
Explanation:
number of moles of co2 is 0.636364
but number of molecules = number of moles times 6.02x10^23
Please if any one know any question help me please
how many elements are in 3cacl2
The photographs show comb jellies and an anglerfish in a benthic ecosystem
Which feature of these organisms' bodies allows them to withstand the
extreme pressure of this environment?
The organism in the bethic zone can survive in such high pressure area. This is because the organism there have no air pockets that provides them the ability to be balanced in the water
Which statements describe Earth's continents? Check all that apply.
A continent is a large distinct landmass.
O There are seven continents on Earth.
o Continents remain the same shape and size over time.
O Continents cover two-thirds of Earth's surface.
Continents are always moving.
A and b and e
Answer:
A continent is a large distinct landmass.
There are seven continents on Earth.
Continents cover two-thirds of Earth’s surface.
Explanation:
Write the balanced chemical equation for the reaction of glucose (C6,H12,O6) with oxygen gas to produce carbon dioxide gas
and water vapor.
Answer:
C6H12O6+6O2=6Co2+6H2o
The balanced chemical equation for the reaction of glucose (C₆H₁₂O₆) with oxygen gas to produce carbon dioxide gas and water vapor is C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O
The balanced chemical equation is the equation in which the number of atoms on the left hand side that is reactant side is equal to the number of atoms on the right hand side that is product side in an equation.
The balanced chemical equation is:
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O
Thus, from the above conclusion we can say that The balanced chemical equation for the reaction of glucose (C₆H₁₂O₆) with oxygen gas to produce carbon dioxide gas and water vapor is C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O
Learn more about the Balanced Chemical equation here: https://brainly.com/question/26694427
#SPJ2
Propane burns to form carbon dioxide and water. The equation for the reaction is:
C 3 H 8 (g)+5 O 2 (g) 3 CO 2 (g)+4 H 2 O(l)
3.60d * m ^ 3 carbon dioxide is produced when a sample of propane is burned in 7.25d * m ^ 3 oxygen.
Calculate the volume of unreacted oxygen. Give your answer in cm^ 3
Answer:
Propane burns to form carbon dioxide and water. The equation for the reaction is:
C3H8 (g)+5O2 (g) -> 3CO2 (g) + 4H2O(l)
Explanation:
From the balanced chemical equation, it is clear that:
1mol. of propane reacts with 5 mol. of O2 and forms 3 mol. of CO2.
In terms of volume, the above equation can be rewritten as:
1.0L. of propane reacts with 5.0L O2 and forms 3.0L of CO2.
Since,
[tex]1dm^{3} =1.0L[/tex]
3.60dm^3 of CO2 is formed from how many dm^3 of O2?
[tex]=>3.60dm^3 CO2 * \frac{5.0L O2}{3.0L CO2}\\=6.0dm^3 O2 \\=6.0L O2[/tex]
The volume of unreacted oxygen is:
[tex]7.25dm^3 -6.0dm^3\\=1.25dm^3[/tex]
The volume of unreacted oxygen is 1.25L or 1250cm^3.
Since,
1dm^3=1000cm^3.
Which statement describes the periodic table?
Answer:
The periodic table is a tabular array of the chemical elements organized by atomic number, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number, oganesson. The atomic number of an element is the number of protons in the nucleus of an atom of that element.
Copper sulfate is a soluble salt that can be made from copper oxide and which acid?
Answer:
Sulfuric acid
Explanation:
What is the energy of a photon that emits a light of frequency 6.42 x 1014 Hz?
Answer:
Option B. 4.25×10¯¹⁹ J
Explanation:
From the question given above, the following data were obtained:
Frequency (f) = 6.42×10¹⁴ Hz
Energy (E) =?
Energy and frequency are related by the following equation:
Energy (E) = Planck's constant (h) × frequency (f)
E = hf
With the above formula, we can obtain the energy of the photon as follow:
Frequency (f) = 6.42×10¹⁴ Hz
Planck's constant (h) = 6.63×10¯³⁴ Js
Energy (E) =?
E = hf
E = 6.63×10¯³⁴ × 6.42×10¹⁴
E = 4.25×10¯¹⁹ J
Thus, the energy of the photon is 4.25×10¯¹⁹ J
Answer:
B. 4.25 x 10-19J is correct via a p e x
Explanation:
i need help asap please :) it says to “identify the reactants.”
the options are
A: Carbon Dioxide and water
B: Glucose and oxygen
C: sunlight and chlorophyll
The reactants are A: Carbon Dioxide and water
Please answer, i will give brainliest.
1. An atom of an elephant has atomic mass of 39 and has number of neutrons as 20 calculate protons number.
2. An atom of an elephant has the atomic number of 13 and 14 neutrons
A. What is the mass number
B. write the nuclear notation given the atoms as X.
C. How many electrons does atom X have?
D. what is number of protons.
Answer:
See Explanation
Explanation:
1) Let us recall that;
Mass number = number of protons + number of neutrons
Where;
Number of protons = ?
Number of neutrons =20
Mass number =39
Number of protons = mass number - number of neutrons
Mass of protons =39 - 20= 19 protons
2) Atomic number = 13
Number of neutrons =14
Then the mass number =13 +14 =27
The symbol of the element is 27X13
The number of protons= the number of electrons =13
The atomic number is the same as the proton number =13
What is the molarity of a 6.48 L soda that contains 5.53 moles of sugar?
Answer:
0.853 M
General Formulas and Concepts:
Acid-Base Titrations
Molarity = moles of solute / liters of solutionExplanation:
Step 1: Define
Identify variables
[Given] 6.48 L
[Given] 5.53 mol
Step 2: Solve for Molarity
Substitute in variables: M = 5.53 mol / 6.48 LDivide: M = 0.853395Step 3: Check
Follow sig fig rules and round. We are given 3 sig figs.
0.853395 M ≈ 0.853 M
What is a likely result of an increase in average global temperatures on Earth?
A. More predictable weather
B. Rising sea levels
C. Fewer rainstorms and blizzards
D. Falling sea levels
Answer:
A.
Explanation:
Warmer temperatures can also lead to a chain reaction of other changes around the world. That's because increasing air temperature also affects the oceans, weather patterns, snow and ice, and plants and animals. The warmer it gets, the more severe the impacts on people and the environment will be.
tell if hand washing is best described as a PHYSICAL CHANGE process or a CHEMICAL CHANGE process.
Answer:
Physical Change
There is no chemical reaction taking place, nor is anything "changing" per se. While yes, hand washing eliminates bacteria, the action in itself is a physical change as nothing is being directly changed and the removal of harmful bacteria is merely a product of the soap.
WHAT IS AN Ionic bond
[tex] {\orange { \mathbb{ \huge{QUESTION}}}}[/tex]
WHAT IS AN IONIC BOND
[tex]\huge\boxed{\fcolorbox{red}{blue}{ ANSWER }}[/tex]
[tex] \orange{\underline{\huge{\bold{\textit{\green{\bf{Ionic \:Bond}}}}}}}[/tex]
kossel explained that inert gases r inert due to the electronic configuration which contains 8 electrons in their outermost shell
And other elements loss and gain electrons to form ions and to have electronic configuration same as Noble gas and to get stable
[tex]Hope\: it \:is\: helpful[/tex]
[tex]Mark \:as\: the\: brainlist\: ans\: with \:thanks... [/tex]
#SARDAR JI.
Answer:
An ionic bond is a chemical bond that results from electrostatic attraction between positive and negative ions.
Explanation:
It occurs between a metal and a non-metal, and the electronegativity will always be greater than 1.7 (which are both expedient ways of identifying this type of reaction). I hope this helps!
Banda se los agradeceria de corazon si me ayudarian con esta tarea :c
FORMULE LAS SIGUIENTES ECUACIONES QUÍMICAS INDIQUE: ELEMENTO QUE SE OXIDA, REDUCE AGENTE OXIDANTE Y AGENTE REDUCTOR.
a. Cinc + ácido clorhídrico produce cloruro de cinc + hidrógeno molecular
b. Sodio + ácido sulfúrico produce sulfato de sodio + hidrógeno molecular
c. Hidróxido de calcio + ácido carbónico produce carbonato de calcio + agua
Answer:
ver explicacion
Explanation:
Zn (s) + 2HCl (ac) ---> ZnCl2 (ac) + H2 (g)
El zinc se oxida y el hidrógeno se reduce. HCl es el agente oxidante mientras que Zn es el agente reductor.
2Na (s) + H2SO4 (ac) ----> Na2SO4 (ac) + H2 (g)
El Na se oxida y el hidrógeno se reduce. El ácido sulfúrico es el agente oxidante, mientras que el sodio metálico es el agente reductor de tge.
Ca (OH) 2 (ac) + H2CO3 (ac) ------> CaCO3 (s) + 2H2O (l)
Esta no es una reacción redox ya que no hay cambios en el número de oxidación de izquierda a derecha.
Read the passage.
The central conflict in the story can best be described as
struggle between
A
the boss and Schmitty.
;
5
B
the narrator and the newsies.
's
С
the newsies and the older gentleman buying a pape
ar
D the boss and Rothlisberger.
Answer:
the narrator and the newsies
Why does lead affect the brain and nervous system?
Answer:
Lead may disrupt the functioning of mitochondria in the developing brain. Because the mitochondria are important for energy production within a neuron, a change in their function may damage the cell. Lead may also affect brain function by interfering with neurotransmitter release and synapse formation.
Which of the following is NOT a sign of a chemical change? (HINT: only 2 answers, the rest are chemical change)
1. tarnished is formed
2. gas is produced
3. weight change
4. Temperature change
5. color change
6. nothing changes
7. forms a precipitate
8. energy is released
Need this done today please!!
Answer:
3 and 6 (weight change and nothing changes)
Explanation:
Hi there!
A chemical change is a change when matter changes into a new substance and has a new chemical property.
The signs that a chemical change is taking place are:
1. change in color
2. change in smell
3. change in energy (for example, there is a change in temperature (thermal energy))
4. a gas is formed (fizzing/bubbling/foaming are signs of this!)
5. formation of a solid (a precipitate)
A physical change is any change to the size, shape, or state of a substance. The substance still has the same chemical property.
these are your eight options:
1. tarnished is formed (a sign of a chemical change; a change in color)
2. gas is produced (a sign of a chemical change)
3. weight change (NOT a sign of a chemical change. Even though the weight changed, the substance still has the same chemical composition and therefore, there wasn't any change to its chemical identity)
4. Temperature change (a sign of a chemical change; a change in energy)
5. color change (a sign of a chemical change)
6. nothing changes (NOT a sign of a chemical change. If nothing happens, the substance is still the same as it was originally and there was no change to its chemical identity.)
7. forms a precipitate (a sign of a chemical change)
8. energy is released (a sign of a chemical change)
therefore the two options that are NOT a sign of a chemical change are 3 and 6 (weight change and nothing changes)
Hope this helps! :)
A phase change is an example of a
.Physical Property
.Chemical Property
.Physical Change
.Chemical Change
Answer:
Physical property
Explanation:
There are two types of properties that can occur in a reaction viz: physical nd chemical. Physical property are those ones have do not change the chemical identity of the substance involved as opposed to chemical properties in which the chemical composition of the substances are changed.
Physical properties include signs such as change of phase i.e. solid to gas, melting and boiling points, colour etc.