The empirical formula for a aluminum compound containing oxygen (AlxOy), if 4.78g of Al reacts is Al3O2.
How to calculate empirical formula?According to this question, 4.78g of Al reacts with oxygen to form a total mass of 6.67g. This means that the mass of oxygen that reacted is 6.67 - 4.78 = 1.89g
Aluminum = 4.78gOxygen = 1.89gFirst, we convert each mass to moles
Al = 4.78 ÷ 27g/mol = 0.17molO = 1.89 ÷ 16g/mol = 0.12molNext, we divide each value by the smallest
Al = 0.17 ÷ 0.12 = 1.42O = 0.12 ÷ 0.12 = 1Multiply each value by 2
Al = 2.8 = 3
O = 2
Therefore, the empirical formula for a aluminum compound containing oxygen (AlxOy), if 4.78g of Al reacts is Al3O2.
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How many joules would be absorbed for the water in Problem 1
Answer:
5000 cal X 4.184 J/cal =
Explanation:
20,920 jules
What type of energy is represented by a battery
Answer:
Electrical Energy
Explanation:
Batteries store chemical energy and change it to electrical energy.
Answer:
Electrical energy
Explanation:
How widespread are the trilobite fossils?
Answer:
Trilobite fossils are found worldwide, with many thousands of known species. ... Because of their diversity and an easily fossilized exoskeleton, they left an extensive fossil record with some 17,000 known species spanning Paleozoic time.
Let me know if this help
Explanation:
Depending on the area and the movement of the plates, the fossils would be kind of close to each other. Maybe about a couple feet at the farthest in one area, almost everywhere.
The base camp is located 5,300 meters above sea level. The hiker observes that the water begins to boil at 82⁰C, much lower than the 100⁰C needed to cook the raw egg. He hopes that just leaving the egg in the boiling water longer will let the egg cook. Will he have hard-boiled eggs for breakfast?
Answer:
No he will not have hard boiled eggs for breakfast
Explanation:
The temperature required to boil the eggs is about 100⁰C. Unfortunately, at the height of the base camp (5,300 meters), water boils at 82⁰C.
This implies that the egg will not become cooked as at the time when the water begins to boil.
Since the eggs can only become hard boiled at 100⁰C and the temperature at which water boils at 5300 meters is less than that(82⁰C), the eggs can not become hard boiled.
As you stare out the window after a rainstorm, you notice water drops on the window. Explain why those drops don’t stream down the window
The accepted density of copper is 8.96 g/mL. Calculate the percent error of a student’s measurement which resulted in a density of 8.86 g/mL.
Answer:
The answer is 1.12 %Explanation:
The percentage error of a certain measurement can be found by using the formula
[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]
From the question
actual density = 8.96 g/mL
error = 8.96 - 8.86 = 0.1
We have
[tex]p(\%) = \frac{0.1}{8.96} \times 100 \\ = 1.1160714...[/tex]
We have the final answer as
1.12 %Hope this helps you
- 75.0 gram sample of water at 25.0 degrees Celsius is mixed with a 100. gram sample of water at 60.0 degrees Celsius.
What is the final temperature of the water? (No units necessary in the answer)
Answer:
45
Explanation:
[tex]m_1[/tex] = First sample mass of water = [tex]75\ \text{g}[/tex]
[tex]\Delta T_1[/tex] = Change in temperature of the first sample of water = [tex]25-T[/tex]
[tex]m_2[/tex] = First sample mass of water = [tex]100\ \text{g}[/tex]
[tex]\Delta T_1[/tex] = Change in temperature of the first sample of water = [tex]T-60[/tex]
[tex]T[/tex] = Final temperature of the mixture
[tex]c[/tex] = Specific heat of water
Heat lost by water will be equal to the heat gained so we get
[tex]m_1c\Delta T_1=m_2c\Delta T_2\\\Rightarrow 75(25-T)=100(T-60)\\\Rightarrow 0.75(25-T)=T-60\\\Rightarrow 18.75-0.75T=T-60\\\Rightarrow 18.75+60=T+0.75T\\\Rightarrow 78.75=1.75T\\\Rightarrow T=\dfrac{78.75}{1.75}\\\Rightarrow T=45\ ^{\circ}\text{C}[/tex]
The final temperature of the water is 45.
Look again at the properties of sodium and chlorine. Then look at the properties of the compound sodium chloride. What do you notice?
What is Avogadro’s number?
A. the number of atoms in exactly 14.00 g of carbon-12
B. the number of atoms in a kilogram of any substance
C. the number of atoms, molecules, ions, formula units, or other particles in a mole of a substance
D. the number of atoms, molecules, ions, formula units, or other particles in a gram of a substance
Answer:
C
Explanation:
a substance/object that reacts with Sodium is Physical or Chemical??
Answer:
physical
Explanation:
it is physical because you add another chemical to the sodium
how atoms differ from others, pls is so urgent
Answer:
There are more than a hundred different atoms, but each element contains only one kind of atom.
Atoms are what make one element different from another.
So what makes one atom different from another?
The Greeks thought atoms could not be divided into anything smaller but they were wrong! Every atom can be divided into three different components - protons, neutrons and electrons.
The nucleus, or centre of an atom, is made of protons, (which have a positive electrical charge) and neutrons, which are neutral (in other words, they have no charge).
Electrons, which have a negative charge, move around the centre of the atom.
Normally, the number of electrons is equal to the number of protons, which makes atoms electrically neutral.
The number of protons in an atom is the defining feature of an atom. It's what makes one element different from another. The number of protons in an atom is called its atomic number. Oxygen atoms have 8 protons. So the atomic number of oxygen is 8.
All the elements in the universe are arranged according to their atomic number in the periodic table.
Atomic mass
If you add together the number of protons (or atomic number) and the number of neutrons in the nucleus of an atom, you can calculate the mass of the atom. Helium (He), atomic number two, has two protons and two neutrons. So the mass number for Helium is 4.
Isotopes
Atoms with the same number of protons but different numbers of neutrons are called isotopes. Uranium-238 and uranium -235 are two different isotopes of uranium. Uranium- 238 has a mass number of 238. Uranium-235 has a mass number of 235. So uranium-238 has more neutrons than uranium-235. But they are still both atoms of uranium because they have the same number of protons.
Among the composition of DNA,do you one is more important than other? why or why not?
Answer:
blood sample of each others
Which of the following is an excited state electron configuration for Iron (Fe)?
a)2-8-18-2
b)2-8-14-2
c)2-8-7-5
d)2-8-10-6
8
Which of the following is a nonmetal?
OA. aluminum (AI)
OB. potassium (K)
OC. chlorine (CI)
OD. calcium (Ca)
Answer:
chlorie (Cl)
Explanation:
aluminum is a metal.
potassium is a metal.
calcium is a metal.
But chlorine is a nonmetal.
brainlest??
Question 14 On Mars, the element zircon has two isotopes, Zr156 and Zr160.84% of a sample is Zr156, which has an atomic mass of 156.8 amu, and 16% Zr160, which has an atomic mass of 159.4 amu. What is the average atomic mass of zircon on Mars? 157.2 amu 158.0 amu 159.2 amu 162.4 amu
Answer:
Option A is correct = 157.2 amu
Explanation:
Given data:
Percentage abundance of Zr-156 = 84%
Atomic mass of Zr-156 = 156.8 amu
Percentage abundance of Zr-160 = 16%
Atomic mass of Zr-160 = 159.4 amu
Average atomic of Zr on Mars = ?
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass = (84×156.8)+(16×159.4) /100
Average atomic mass = 13171.2 + 2550.4 / 100
Average atomic mass = 15721.6 / 100
Average atomic mass = 157.2 amu.
Help Please!!!!!!!!!!!!!!!!!!!!!!
Answer:
B
Explanation:
pls help
What is the chemical formula for the following compound?
Br : ca: (Br:
CaBr2
OCaBr
Ca2Br
O None of the above
Answer:
CaBr2
Explanation:
There is one calcium atom and 2 Bromine atoms.
Hope this helps!
The unit cm2 is used to measure:
Answer:
While calculating the surface area of an object, the unit of measurement becomes cm2
Explanation:
What factors decrease the transfer of thermal energy?
ASAP
Answer:
What 3 factors influence the amount of thermal energy in an object, and how do they each affect it? Mass, temperature, and phase. More mass, more Thermal Energy. Higher temperature, more Thermal Energy.
ASAP=abbreviation. As soon as possible. 'fill in your form and send it to us ASAP' More example sentences.
Which of the following particles Are free to drift in metals
What is a bone charcoal
Answer:
Bone char is a porous, black, granular material produced by charring animal bones. Its composition varies depending on how it is made; however, it consists mainly of tricalcium phosphate 57–80%, calcium carbonate 6–10% and carbon 7–10%. It is primarily used for filtration and decolorisation.
The element sodium has an atomic number of 11and a mass number of 23 how many protons neutrons and electrons does one atom contain
Explanation:
Element sodium (Na) has an atomic number of 11
mass number = 23
proton = 11
electron = 11
Neutron = mass number - atomic number
= 23 - 11
= 12
How many atoms total are in this formula? 2 Ni3 (H3O4)2
Answer:
30 atoms
Explanation:
2Ni(H₃O₄)₂
There are two nickel, twelve hydrogen and sixteen oxygen atoms are present in given formula.
The given formula is actually having two moles of Ni(H₃O₄)₂.
Thus in two mole total number of atoms are = 2+12+16 =30 atoms
In one mole there are one nickel atom, six hydrogen atom and eight oxygen atoms are present.
Thus in one one mole total number of atoms are = 1+6+8 =15 atoms
However this compound does not exist.
An element that is likely to have this property of being semiconducting? Bromine, Sodium, or Tellurium?
Answer:
EASY
Explanation:
Answer:
Sodium
Explanation:
because it can cause electricity
describe the valence electrons in nitrogen and how it could bond to other atoms.
There are five valence electrons in nitrogen atom and they always participate in covalent bond formation.
Atoms participate in;
Ionic bondingCovalent bondingMetallic bondingThe type of bonding that atoms of elements are involved in depends on the number of electrons in the valence shell of each of the bonding atoms.
Recall the elements that have very few electrons in their valence shell(metals) often form ionic bonds with other elements whose valence shell are less than the stable octet by one or two electrons.
On the other hand, nonmetals having more electrons on their valence shell often share electrons in a covalent bond.
Nitrogen is a nonmetal that has five valence electrons. Nitrogen often shares three of these electrons with atoms of other elements in a covalent bond.
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What happens to particles at a higher temperature?
A)speed up
B)slow down
C)remain constant
D)they double in size
Answer:
A.) Speed up
Explanation:
Heat is directly proportional to kinetic energy which happens when the particles are moving very quickly. This means that more speed = more heat.
Answer:
A
Explanation:
With an increase in temperature, the particles move faster as they gain kinetic energy, resulting in increased collision rates and an increased rate of diffusion. ... With an increase in temperature, the particles gain kinetic energy and vibrate faster and more strongly.
Can someone please help me no false information plssss
Answer:it's the third one
Explanation:
A lithium atom contains 3 protons , 4 neutrons and 3 electrons
Describe at least 3 pieces of information that may be important for building a homemade thermos
Answer:
3 things
Explanation:
something to keep it insulated and stay warm, a container, a lid that can open and close.
L avanzar hacia la derecha por el período 5, el tamaño atómico, la energía de ionización y los electrones de valencia: A. disminuye, aumenta y aumentan, respectivamente. B. aumenta, disminuye y disminuye, respectivamente. C. disminuye, disminuye y aumentan, respectivamente. D. disminuye, aumenta y disminuyen, respectivamente.
Answer:
Al avanzar hacia la derecha por el período 5, el tamaño atómico, la energía de ionización y los electrones de valencia: A. disminuye, aumenta y aumentan, respectivamente.
Explanation:
El radio atómico representa la distancia que existe entre el núcleo y la capa de valencia, es decir la más externa. Por medio del radio atómico es posible determinar el tamaño del átomo. En un período el tamaño atómico disminuye de izquierda a derecha pues en este sentido aumenta el número atómico aumentando la carga nuclear mientras que el efecto pantalla y el número de niveles permanecen constantes. En otras palabras, disminuye de izquierda a derecha debido a la atracción que ejerce el núcleo sobre los electrones de los orbitales más externos, disminuyendo así la distancia núcleo-electrón.
Al avanzar hacia la derecha por el período 5, el tamaño atómico disminuye.
La energía de ionización es la necesaria para remover un electrón a un átomo en estado gaseoso. Mientras más lejos del núcleo esté el electrón, es más fácil removerlo porque se necesita menos energía. Al aumentar el número atómico de los elementos de un mismo período, se incrementa la atracción nuclear sobre el electrón más externo, ya que disminuye el radio atómico y aumenta la carga nuclear efectiva sobre él. Entonces en un período, al aumentar el número atómico, la energía de ionización aumenta.
Entonces, al avanzar hacia la derecha por el período 5, la energía de ionización y los electrones de valencia aumenta.
Los electrones de valencia son los electrones que están en la última capa electrónica (llamados orbitales de valencia) y tienen una alta posibilidad de participar en una reacción química.
En cada período aparecen los elementos cuyo último nivel de su configuración electrónica coincide con el número del período, ordenados por orden creciente de número atómico. Por ejemplo, el período 3 incluye los elementos cuyos electrones más externos están en el nivel 3.
Los electrones de valencia aumentan en número a medida que se avanza en un período.
Entonces, al avanzar hacia la derecha por el período 5, los electrones de valencia aumentan.