Answer:
0.143kg/m^3
Explanation:
density= mass / volume
Answer:
1/7 kg/cubic metres
Explanation:
Here, Density=mass /volume
=6/42
=1/7 kg/cubic metres.
How many grams or H20 are produced if 25 grams of HCl are used?
Answer:
15.1 grams
Explanation:
Answer:
I did some research and found some things here, its another sight sort of like brainly. Hopefully this helps!
Explanation:
https://socratic.org/questions/how-many-grams-of-potassium-chloride-are-produced-if-25-0g-of-potassium-chlorate
how many moles of c are formed upon complete reaction of 2 mol of b according to the generic chemical reaction: a 2b->c
Answer:
1 mol
Explanation:
It's about balacing the equation. 2 parts "b" can form 1 part "a". So take 2 mol and divide by 2.
What is the molarity of a NaOH solution if 48.0 mL of a 0.220 M H2SO4 solution is required to neutralize a 25.0-mL sample of the NaOH solution?
Answer:
Molarity NaOH = 0.85M (2 sig figs)
Explanation:
48.0ml(0.220M H₂SO₄) + 25ml(Xmolar NaOH)H₂SO₄ + 2NaOH => Na₂SO₄ + 2H₂O
2(molarity x volume) H₂SO₄ = (molarity x volume) NaOH
2(0.220M x 48.0ml) = 25.0ml x Molarity NaOH
Molarity NaOH = 2(0.220M x 48.0ml)/25.0ml = 0.8448M ≅ 0.85M (2 sig figs)
CH4 + 202 → CO2 + 2H2O
The electron configuration 1s2 2s2 2p6 3s2 3p6 4s1 3d10 describes the electron configuration of what neutral element?
Answer:
Copper
Explanation:
Copper has this electronic configuration.
You can count the total number of electrons
= 29
Cu is the 29 th in the periodic table.( atomic number = 29)
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, the given electronic configuration represents copper element.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
The systematic distribution of electrons in the various atomic orbitals is called its electronic configuration. The atomic number of copper is 29. The electronic configuration of copper is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d¹⁰. 1,2,3 represents the number of shells and s and represents the orbitals. The superscripts represents the number of electrons in each orbitals.
Therefore, the given electronic configuration represents copper element.
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How does an electric generator work?
Answer:
A conductor coil (a copper coil tightly wound onto a metal core) is rotated rapidly between the poles of a horseshoe type magnet. ... The magnetic field will interfere with the electrons in the conductor to induce a flow of electric current inside it.
What is Al and O's balanced compound?
Answer:
Aluminum generally forms Al3+ ions. Oxygen generally forms O2− ions. So when the metal and the non-metal make music together they form a neutral compound, i.e. Al2O3 (i.e. 2×3−3×2=0) . The ionic bonding is so strong (due to charge magnitude) in this material that it is reasonably insoluble.
Explanation:
The relative atomic mass of chlorine is 35.5.
When calculating relative atomic mass, which particle is the mass of a chlorine atom compared
to?
Given what we know, we can confirm that relative atomic mass is calculated by comparing the particles to the atomic mass of a carbon-12 atom.
Why compare to carbon-12?Carbon is a very common element. It was been studied greatly, telling us a great deal about the atom. It contains 6 protons and 6 neutrons.This makes it very stable and the standard for comparison.Therefore, given its abundant nature and the fact that it has been extensively studied, we can confirm that a carbon 12 atom has exactly 6 protons and 6 neutrons, making it very stable and the standard to which other atoms are compared.
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10m/s for 30 seconds
Answer:
300 meters for 30 seconds
Explanation:
10*30= 300 therefore giving you your answer.
Vote brainliest!
do not delete i just need help
Answer:
A. prokaryotic cell
Explanation:
We can easily identify the diagram as prokaryotic cell by the capsule shown. These organisms mostly have capsules.
Calcule la molaridad de una solución acuosa de ácido sulfúrico (H₂SO₄) que se preparó al mezclar, en un recipiente aforado, 4 moles del ácido con suficiente agua hasta completar 8 litros de solución. *
0.4
0.6
0.3
0.5
Considerando la definición de molaridad, la molaridad de una solución acuosa de ácido sulfúrico (H₂SO₄) es 0.5 [tex]\frac{moles}{litro}[/tex].
La molaridad es una medida de la concentración de un soluto en una disolución que se define como el número de moles de soluto que están disueltos en un determinado volumen.
La molaridad de una solución se calcula dividiendo los moles del soluto por el volumen de la solución:
[tex]Molaridad=\frac{numero de moles de soluto}{volumen}[/tex]
La Molaridad se expresa en las unidades [tex]\frac{moles}{litro}[/tex].
En este caso, sabes que una solución acuosa se preparó al mezclar 4 moles del ácido con suficiente agua hasta completar 8 litros de solución. Entonces, sabes que:
número de moles de soluto= 4 molesvolumen= 8 litrosReemplazando en la definición de molaridad:
[tex]Molaridad=\frac{4 moles}{8 litros}[/tex]
Resolviendo:
Molaridad= 0.5 [tex]\frac{moles}{litro}[/tex]
Finalmente, la molaridad de una solución acuosa de ácido sulfúrico (H₂SO₄) es 0.5 [tex]\frac{moles}{litro}[/tex].
Aprende más:
https://brainly.com/question/17647411?referrer=searchResultshttps://brainly.com/question/21276846?referrer=searchResultswhich compound is soluble in excess ammonia solution. A. Copper (II) sulphate B. iron (II) chloride. C.Magnesium chloride. D. Magnesium Chloride
1. A box of hardware contains 100 pieces. Assuming there are 25 pieces in each vial, calculate the
mass of a box of each kind of hardware. Express these values in units of g/box
Answer:
fofo you for your patience and
The question is incomplete.
Following things are required to solve the question:-
Mass of the vileMass of the piecesWithout the information we can not solve the question. Therefore, please provide with the incomplete information.
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the number of neutrons in the nucleus of an atom can be determined by
Answer:
To calculate the number of neutrons, subtract the atomic number (which equals the number of protons) from the mass number.
hope this helps☆☆☆
A student wants to perform an experiment to study the relationship between the temperature and pressure of an enclosed gas. In one or two sentences, describe two assumptions that must be made in performing this experiment.(2 points)
An assumption that must be made when studying the relationship between pressure and temperature is that the gases do not interact with each other.
An experiment seeks to understand the effect of one variable on the other. The relationship between the pressure and temperature of a gas is commonly studied.
In an experiment to determine the relationship between temperature and pressure of a gas, the following assumptions must be made;
The gases molecules only occupy only a negligible volume compared to the total volume of the gas.The gas molecules do not interact with each other.Learn more: https://brainly.com/question/6111443
diagram of a separate funnel
Answer:
Separation techniques
Separating Funnel - Separation techniques
Explanation:
if you look this up this should help i think
Which process releases heat?
O A. Sanding wood
O B. Baking bread
O C. Burning gasoline
O D. Frying french fries
Answer:
C
Explanation:
burning gasoline i think pls can i have brainliest if right!
Answer:French fries
Explanation:
PLEASE EXPLAIN what is glucose
Answer:
(Hope this helps can I pls have brainlist (crown)☺️)
Explanation:
Glucose is the most common form of sugar in the blood and the body's primary source of energy. Glucose is derived from the meals we eat or produced by the body from other chemicals. The circulation transports glucose to the cells. Several hormones, including insulin, regulate blood glucose levels.
a simple sugar that is a component of many carbohydrates and is a vital source of energy in living things.
Blood sugar, often known as glucose, is the most common sugar present in the body. It is your body's major source of energy and comes from the food you eat. Glucose is carried by your blood to all of your body's cells, where it is used for energy.
In the formula
1N2 +3H2 → 2NH3 + 1H2
1 diatomic nitrogen (1N2) and 3 diatomic hydrogen (3H2) produce 2 ammonia (2NH3) with 1 diatomic hydrogen (1H2) left over. How can you change the formula so no diatomic hydrogen (H2) is left over?
(1 point)
Remove a H2 molecule from the left side of the equation.
Remove a cap h sub 2 molecule from the left side of the equation.
Remove a NH3 molecule from the right side of the equation.
Remove a cap n cap h sub 3 molecule from the right side of the equation.
There is nothing that can be done to use the leftover molecules.
There is nothing that can be done to use the leftover molecules.
Add another N2 molecule to the left side of the equation.
Answer: remove a H2 molecule from the left side of the equation
Explanation:
In the chemical equation and concept of balancing of equations if to ensure that no diatomic hydrogen is left over remove a H₂ molecule from the left side of the equation.
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.
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Calculate the mass of iron formed when 299g of iron (ii) oxide is reduced by excess carbon monoxide
Answer:
Mass = 88.12 g
Explanation:
Given data:
Mass of iron oxide = 126 g
Mass of iron formed = ?
Solution:
Chemical equation:
Fe₂O₃ + 3CO → 2Fe + 3CO₂
Number of moles of iron oxide:
Number of moles = mass/molar mass
Number of moles = 126 g/ 159.69 g/mol
Number of moles = 0.789 mol
Now we will compare the moles of iron with iron oxide.
Fe₂O₃ : Fe
1 : 2
0.789 : 2/1×0.789 = 1.578 mol
Mass of iron:
Mass = number of moles ×molar mass
Mass = 1.578 mol × 55.84 g/mol
Mass = 88.12 g
select the reagents you would use to accomplish the syntheses shown below in no more than the number of steps specified.
Answer:
Carbon Dioxide + Water
Explanation:
Carbon Dioxide + Water > Glucose + oxygen
Help please and thank you for who ever
Answer:the first one
Explanation:
Answer:
Ribosomes are found in both cells
Increase in pressure affects which of the following states in chemical reactions? A Solid only B Liquid only С Gas only D All of the above
Answer:
D All of the above
[tex] \: [/tex]
what is the mass percent of hydrogen in water
Answer:
11.11%
Explanation:
The percentage of an element in a compound is 100 times the fraction, so for water the mass percent hydrogen is 11.11%
Hope this helps :)
How many silicon atoms are in a typical computer microchip (0.001 g of silicon)?
The number of silicon atoms in atypical computer chips(0.001g of silicon) is 2.14 × 10¹⁹ atoms
The atomic mass of silicon = 28.0855 amu
Using the mole concept that 1 mole = 6.022 × 10²³.
This number is called the Avogadro's number.
Therefore,
1 mole / 28.0855g of silicon contains 6.022 × 10²³ atoms of silicon
0.001 g will contain ? atoms of silicon
cross multiply
number of atoms of silicon = 6.022 × 10²³ × 0.001 / 28.0855
number of atoms of silicon = 6.022 × 10²⁰ / 28.0855
number of atoms of silicon = 2.14 × 10¹⁹ atoms
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Which of the following correctly compares the radii of Na and Na+? (4 points)
Group of answer choices
Na has a smaller radius than Na+ because Na has expanded its electron cloud.
Na has a larger radius than Na+ because Na has lost its outermost energy shell.
Na has a smaller radius than Na+ because Na+ has expanded its electron cloud.
Na has a larger radius than Na+ because Na+ has lost its outermost energy shell.
Answer:
D. Na has a larger radius than Na+ because Na+ has lost its outermost energy shell.
Explanation:
The radius is larger because the diameter of Na+ is larger.
Sodium has smaller atomic radius than sodium cation because sodium has expanded electron cloud.
What is atomic radius?
Atomic radius is defined as the distance between outermost shell and the nucleus. Atomic radius varies across the periodic table where in groups it increases due to the fact that new shells are added on moving sown the group.
While in a period it decreases from left to right across the periodic table as electrons are added to the same shell which causes contraction of the atom.In case of comparison between an atom and a cation an atom has smaller atomic radius due to presence of electrons while in case of ions atomic radius is smaller as they have less number of electrons.
Atoms have expanded electron cloud while the electron cloud in case ions is small , the reason being the presence of large number of electrons in case of atoms and less number of electrons in case of ions.
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which side of the periodic table are the metals on
Answer:
left
Explanation:
Metals are to the left of the line (excluding hydrogen, which is a nonmetal), nonmetals are to the right of the line, and metalloids are to the immediate right of the line.
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How many cobalt atoms are in 2 moles of cobalt?
That means that one mole of cobalt weighs 58.9332 grams (58.9332 g/mol). Based on that information, to convert 2 moles of cobalt to grams, we multiply 2 moles of cobalt by 58.9332.
12.04428152 x [tex]10^{23}[/tex] cobalt atoms are in 2 moles of cobalt.
What are moles?A mole is defined as 6.02214076 ×[tex]10^{23}[/tex]
of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
One mole of cobalt is equal to 6.02214076 ×[tex]10^{23}[/tex] atoms.
2 moles of cobalt is equal to 6.02214076 × [tex]10^{23}[/tex]atoms x 2
12.04428152 x [tex]10^{23}[/tex]
Hence, 12.04428152 x [tex]10^{23}[/tex]cobalt atoms are in 2 moles of cobalt.
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A precious metal is _________________ a. An element with super and electric and thermal conductivity, high luster, and sensitivity. B. A highly sought after dense, shiny, soft precious metal that has been used as money for many centuries. C. An highly valuable element with super and electric and thermal conductivity, high luster, and sensitivity. D. A soft, sensitive, and lustrous element with the highest conductivity of any element. Please select the best answer from the choices provided A B C D.
Answer:
c.
an highly valuable element with super and electric and thermal conductivity, high luster, and sensitivity.
Explanation:
A precious metal is a highly valuable element with super and electric and thermal conductivity, high luster, and sensitivity, hence option C is correct.
How precious metal is differed from the base metal?Rare metallic chemical elements with a high economic value are known as precious metals. The valuable metals are often less reactive chemically than most elements.
Iron-free metals and alloys are not considered base metals. Base metals have a propensity to tarnish, oxidize, or corrode with time or when exposed to the environment, in contrast to valuable metals.
Base metals typically cost less than precious metals since they are more plentiful in nature and sometimes easier to mine.
Therefore, a precious metal is a highly valuable element with super and electric and thermal conductivity, high luster, and sensitivity.
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Write the electron configuration for the metal in group 5A and the alkali metal in period 2
Will give brainliest if answered fast :)
Answer:
metal in group 5A is bismuth
electronic configuration : 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^6 4d^10 5s^2 5p^6 4f^14 5d^10 6s^2 6p3
alkali metal in period 2 is lithium
1s^2 2s^ 1
Explanation: