Answer:
2.89× 10²³ atom
Explanation:
Given data:
Number of atoms of Zn = ?
Number of moles of Zn = 0.48 mol
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atom
0.48 mol × 6.022 × 10²³ atom / 1mol
2.89× 10²³ atom
PLEASE HELP!
Which of the following is an example of a chemical change?
A. A large nail rusting
B. Folding a piece of paper
C. Filling a balloon with hot air
D. Wax melting from a candle
Answer: A. a large nail rusting
Explanation:
1) How much energy, in joules, is needed to change 26.5 g of solid water at 0.0 deg C to liquid water at 48.3 deg C?
Answer:
Q = 5350.2 Joules.
Explanation:
Given the following data;
Mass, m = 26. 5g
Initial temperature, T1 = 0°C
Final temperature, T2 = 48.3°C
Specific heat capacity of water, c = 4.18 J/g°C.
*To find the quantity of heat*
Heat capacity is given by the formula;
[tex] Q = mcdt[/tex]
Where;
Q represents the heat capacity or quantity of heat. m represents the mass of an object. c represents the specific heat capacity of water. dt represents the change in temperature.dt = T2 - T1
dt = 48.3 - 0
dt = 48.3°C
Substituting the values into the equation, we have;
[tex] Q = 26.5*4.18*48.3[/tex]
Q = 5350.2 Joules.
Therefore, the amount of heat absorbed is 5350.2 Joules.
we need to use the table to provide the answer, help ;-;
a. The symbol [tex]\tt _{11}^{23}Na[/tex], [tex]\tt _{18}^{40}Ar[/tex], [tex]\tt _{15}^{31}P^{3-}[/tex], [tex]\tt _{13}^{27}Al^{3+}[/tex]
b. Isotope of Na
Further explanationAtomic number=number of protons=number of electrons(neutral atom)
Number of neutrons=mass number-atomic number
Mass number=protons+neutrons
B. atomic number=11, mass number=11+12=23⇒Sodium
[tex]\tt _{11}^{23}Na[/tex]
C. atomic number=18, mass number=18+22=40⇒Argon
[tex]\tt _{18}^{40}Ar[/tex]
D. atomic number=15, mass number=15+16=31, charge -3(electron-proton)⇒Phosphor
[tex]\tt _{15}^{31}P^{3-}[/tex]
E. atomic number=13, mass number=13+14=27, charge +3(proton-electron)⇒Aluminium
[tex]\tt _{13}^{27}Al^{3+}[/tex]
Isotope=the same atomic mass, different neutron(mass number)
So the atom⇒isotope of Sodium(Na)
what is a product of a chemical reaction?
Answer:
A substance that is present at the end of a chemical reaction.
What happens when the North Pole of one bar magnet is near the south Pole of another bar magnet?
A.Both attraction and repulsion
B.neither attraction nor repulsion
C.attraction
D.repulsion
When the North Pole of one bar magnet is near the South Pole of another bar magnet, they will attract each other. So, the correct option is C, attraction. This is because opposite magnetic poles attract each other, while like magnetic poles repel each other.
What is a magnetic field?A magnetic field is a region in space where a magnetic force can be detected. It is created by the movement of charged particles, such as electrons, protons, and ions. A magnetic field can be produced by a magnet, an electric current, or a changing electric field.
When the North Pole of one bar magnet is near the South Pole of another bar magnet, they will attract each other. This is because the magnetic field lines of the two magnets interact in such a way that they try to align with each other. Since opposite magnetic poles attract each other, the North Pole of one magnet will be attracted to the South Pole of the other magnet.
The magnetic force between the two magnets depends on the strength of the magnetic field and the distance between the magnets. The closer the magnets are, the stronger the magnetic force will be.
Therefore option C, attraction is correct.
To learn more about The magnetic field:
https://brainly.com/question/23096032
#SPJ7
the non-metal elements selenium has six electrons in its outer orbit what atoms of this element form positively charged or negatively charged ions
Answer:
positively charged -protons
Negatively charged-electrons
What is a covalent bond?
Which rule concerning oxidation numbers is true?
A. When a redox reaction occurs, there will always be at least one atom that is oxidized and at least one atom that is reduced.
B. Oxidation is the process by which an atom loses electrons.
C. Reduction is the process by which an atom gains electrons.
D. All of the Above
E. None of the Above
Answer:
B
Explanation:
because an atom is the smallest particles that have electrons, neutron and protons
Consider the geologic time scale. A scientist discovered two fossils. Fossil A is from the Triassic time period. Fossil B is from the Cambrian time period. Which one is older? Why?
Answer:
Cambrian
Explanation:
The fossil from the Cambrian is older than the one from the Triassic. This is because in the geologic time scale, the Cambrian is older than the Triassic.
Absolute age of the Cambrian is between 541 - 484myaIt is the first geological period in the Paleozoic era. The Triassic is the earliest period of the Mesozoic eraIt occurred about 237mya ago. Therefore, the fossils which corresponds to the Cambrian is the oldest.Matter and energy may be created or destroyed in a chemical reaction.
Answer:false
Explanation:matter cannot be created or destroyed in a chemical reaction it is rearranged
What is the correct formula for Strontium Selenide?
Answer:
(SrSe) | SeSr - PubChem.
Explanation:
What best explains how they should complete the table?
with “Inside the nucleus,” because the particle is a proton
with “Inside the nucleus,” because the particle is a neutron
with “Outside the nucleus,” because the particle is a proton
with “Outside the nucleus,” because the particle is an electron
Explanation:
An atom is made up of three fundamental subatomic particles which are:
Protons Neutrons ElectronsProtons are the positively charged particles in an atom. They are found in the nucleus of the atom.
Neutrons do not carry any charges, like the protons, they occupy the tiny nuclear space.
Electrons are positively charged particles and they occupy the extra-nuclear space of the atom.
Both protons and neutrons are found in the nucleus.Answer:
Depends, you have to give us a table, let me explain how to answer this.
Explanation:
“Inside the nucleus,” because the particle is a proton
For this to be true, it has to have a mass (amu) of 1 and it has to have a positive charge
“Inside the nucleus,” because the particle is a neutron
For this to be true, it has to have a mass (amu) of 1 and it has to have a neutral charge
“Outside the nucleus,” because the particle is a proton
This is instantly wrong because protons are located in the nucleus
“Outside the nucleus,” because the particle is an electron
For this to be true, it has to have a mass (amu) of 1/2000 and it has to have a negative charge
What’s different about the object floating and the water?
I need help plz.
Answer:
Different objects float at different levels in the water because as most regular objects are lowered into the surface of water, the upward push of the water steadily increases until it is in balance with the weight force of the object, and the object then continues floating at this level with the two forces in balance.
two of these statement about elements and atoms are true, and one is false. which statements are true
Answer:
Yeah take a pic or somethin
Explanation:
A 100 kg log of wood was neatly cut into two smaller pieces. What is the total mass of all the smaller pieces put together?
Answer:
B
Explanation:
It is B because it's neatly cut into two parts, 50 and 50. That still adds up to 100 its the same total amount just cut up. So, 100 kg
Answer:
its B. 100 cleanly cut in half is 50/50. but it's still gonna be 100 total.
Explanation:
Substance A is tested to see if it is an acid or a base. A piece of iron is placed
in substance A and the iron starts to wear away over time (corrosive).
Substance A has a sour taste, and will produce a burning/tingling feeling
when touched with a bare hand. Is Substance A an acid or a base?
Answer:
[tex]\huge\boxed{\sf Acid}[/tex]
Explanation:
An acid has the following properties:
=> Is corrosive to Iron and reacts with it.
=> Has a sour taste.
=> Produces a burning sensation when touched.
So, Substance A is an acid.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AnonymousHelper1807La etiqueta de una bebida transparente con un ligero toque anaranjado indica que contiene aga con un 15 porciento de zumo de naranja, un 2porciento de vitamina C y un 1porciento de colorantes. Dentro de la botella hay 800g de zumo. calcula la masa e la vitamina C y colorantes en los 800 gramos de zumo
Respuesta:
16 gramos de vitamina C y 8 gramos de colorantes.
Explanation:
Debemos multiplicar el porcentaje de cada componente por la cantidad total (100 %) de zumo.
800 g de zumo = 100%
- Tenemos un 2 porciento (2 en 100 o 2/100) de vitamina C. Por lo tanto, la cantidad en gramos de vitamina C es:
2/100 x 800 g = 16 g
- Tenemos un 1 porciento de colorantes en el zumo (1/100). Por lo tanto, la cantidad en gramos de colorantes es:
1/100 x 800 g = 8 g
Which refers specifically to a solution with as much dissolved solute as it can hold at a given temperature?
supersaturated
saturated
heterogeneous
homogeneous
Please and fast
Answer:
Saturated is the answer you are looking for
Explanation:
This is saturated's meaning: holding as much water or moisture as can be absorbed; thoroughly soaked.
"a mass of saturated air decreases in temperature as it rises in the atmosphere" Hence why the answer is saturated! :)
Hope this helps! :)
Answer: Saturated
Explanation: On Edge!!!!!!!!!!!!!
A student titrated 25.0 cm3 portions of dilute sulfuric acid with a 0.105 mol/dm3 sodium hydroxide solution.The equation for the reaction is: 2 NaOH + H2SO4 ⟶ Na2SO4 + 2 H2O Calculate the concentration of the sulfuric acid in mol/dm3 Use only the student's concordant results.
Answer:
This question is incomplete
Explanation:
This question is incomplete as the volume of the base that was used during the titration was not provided. However, the completed question is in the attachment below.
The formula to be used here is CₐVₐ/CbVb = nₐ/nb
where Cₐ is the concentration of the acid = unknown
Vₐ is the volume of the acid used = 25 cm³ (as seen in the question)
Cb is the concentration of the base = 0.105 mol/dm³ (as seen in the question)
Vb is the volume of the base = 22.13 cm³ (22.1 + 22.15 + 22.15/3)
nₐ is the number of moles of acid = 1 (from the chemical equation)
nb is the number of moles of base = 2 (from the chemical equation)
Note that the Vb was based on the concordant results (values within the range of 0.1 cm³ of each other on the table) of the student
Cₐ x 25/0.105 x 22.13 = 1/2
Cₐ x 25 x 2 = 0.105 x 22.13 x 1
Cₐ x 50 = 0.105 x 22.13
Cₐ = 0.105 x 22.13/50
Cₐ = 0.047 mol/dm³
The concentration of the sulfuric acid is 0.047 mol/dm³
help me please and actually try to answer :(
All of these properties are for alkali metals except one
Good conductors of heat and electricity
Solids
High melting and boiling points
Silver color
Which scientific law states the relationship between an object's mass, acceleration, and amount of force acting on it? *
Answer:
Newtons Second law of motion
Explanation:
Is the osmosis egg challenge a chemical reaction?
If so, was the stored energy in the reactants released (exothermic) or absorbed (endothermic) during this physical change?
If not, was energy released (exothermic) or absorbed (endothermic) by the molecules during this physical change?
Answer:
Answer is C because in exothermic reactions, energy releases.
in Cellular respiration,
ATP+H20 (water) = ADP+ Pi + Energy
So celullar respiration is exothermic and releases energy
Answer:
yes it is
Explanation:
because what ever you mix in it it would explode and give a chemical reaction
The question is in the picture and if you don't know it please don't answer with a ridiculous response Thank you!
Answer: It is B.) 1s^22s^12p^1
Explanation: mind giving me brainliest? :)
Answer:
ñanamaisañia ñanamaisañia
Explanation:
n
The runners have just started a race. They started at rest and are getting faster.
What statement best describes the motion of the runners at the beginning of the race?
A.
Acceleration is positive and speed is increasing.
B.
Acceleration and speed both remain constant.
C.
Velocity and speed both remain constant.
D.
Velocity remains the same and speed is positive.
A. Acceleration is positive and speed is increasing.
Further explanationThe motion performed by a runner is part of a uniformly accelerated motion with constant acceleration.
Equation used
[tex]\tt \boxed{\bold{v_f=v_i+at}}[/tex]
vf = final velocity
vi = vo = initial velocity
When a runner moves from rest, his speed will increase from being at rest (vi=0) and then move with a constant acceleration(a), and as soon as he crosses the finish line his acceleration will decrease (experience a deceleration ⇒a=- ) and decrease his speed until it finally stops
Velocity and speed are different because velocity itself is a vector quantity that takes into account direction and displacement, while speed is a scalar quantity (only distance).
So the speed does not take positive or negative values because it involves direction, while acceleration takes positive and negative values (deceleration) because it takes direction.
Give three examples of monoatomic molecules.
Answer:
Helium
Radon
and Neon
Explanation:
3. People and instruments produce different ranges of sound temperatures is this true or false
Science
Can someone help me please click the picture?
Answer:
The number of atoms on both sides of the expression is not balanced
Explanation:
Stated equation:
KClO₃ → KCl + O₂
The equation above does not obey the law of conservation of mass because the atoms on both sides of the expression are not the same.
The law of conservation of mass states that "in a chemical reaction, atoms are neither created nor destroyed, but are transformed by combining with one another";
Number of atoms
Elements Left hand side Right hand side
K 1 1
Cl 1 1
O 3 2
We see that the number of oxygen on both sides of the expression differs.
does a positive charge make the atomic radius smaller? and does a negative charge make the atomic radius bigger? yes or no.
10.8 1.0
Electronegativity difference of Mg and O:
yes
no
Answer:
2.3 / yes
Explanation:
edg 2020
Answer: 2.3 and yes
Explanation: