Answer:
because it's composed of two elements, hydrogen and oxygen. water is technically a molecular compound tho, for it has two hydrogens.
18.
react to cause chemical reactions
Protons
Neutrons
Electrons
how many grams of sulphur contain 3.0×1021 atoms
Answer:
There are 0.16 g of sulphur in 3.0 × 10²¹ atoms.
Explanation:
One mole of a substance contains 6.02 × 10²³ particles
One mole of sulphur atom contains 6.02 × 10²³ atoms
Number of moles of sulphur present in 3.0 × 10²¹ atoms = 3.0 ×10²¹/6.02 10²³
Number of moles of sulphur atom = 0.00498 moles of sulphur atom
The mole of a substance is related to its mass by a quantity known as molar mass which is defined as the mass of one mole of that substance.
Molar mass of sulphur atom = 32 grams per mole (g/mol)
Mass of 0.00498 moles of sulphur atom = 0.00498 moles × 32 g/mol
Mass of sulphur = 0.16 g
Therefore, there are 0.16 g of sulphur in 3.0 × 10²¹ atoms.
Use a scientific calculator to calculate [H+] for the following pH values:
7 (a neutral solution)
5.6 (unpolluted rainwater)
3.7 (first acid rain sample in North America)
How many times higher is the concentration of H+ in the Hubbard Brook sample than in unpolluted rainwater?
Answer:
pH = 7 ⇒ [H⁺] = 1.0x10⁻⁷ M
pH = 5.6 ⇒ [H⁺] = 2.5x10⁻⁶ M
pH = 3.7 ⇒ [H⁺] = 2.0x10⁻⁴ M
H⁺ concentration in the Hubbard Brook sample is 80 times higher than in unpolluted rainwater.
Explanation:
To answer this problem we need to keep in mind the definition of pH:
pH = -log[H⁺]Meaning that after isolating [H⁺] we're left with:
[H⁺] = [tex]10^{-pH}[/tex]Now we proceed to calculate [H⁺] for the given pHs:
pH = 7 ⇒ [H⁺] = [tex]10^{-7}[/tex] = 1.0x10⁻⁷ MpH = 5.6 ⇒ [H⁺] = [tex]10^{-5.6}[/tex] = 2.5x10⁻⁶ MpH = 3.7 ⇒ [H⁺] = [tex]10^{-3.7}[/tex] = 2.0x10⁻⁴ MFinally we calculate how many times higher is [H⁺] when pH = 3.7 than when pH = 5.6.
2.0x10⁻⁴ / 2.5x10⁻⁶ = 80Answer:
1. 7 (a neutral solution)
Answer: 10-7= 0.0000001 moles per liter
2. 5.6 (unpolluted rainwater)
Answer: 10-5.6 = 0.0000025 moles per liter
3. 3.7 (first acid rain sample in North America)
Answer: 10-3.7 = 0.00020 moles per liter
The concentration of H+ in the Hubbard Brook sample is 0.00020/0.0000025, which is 80 times higher than the H+ concentration in unpolluted rainwater.
Explanation: -
Did anyone do this worksheet (science)
Which statement correctly describes the relationship between air temperature and air pressure?
-Warm air rises, creating an area of low pressure.
-Cool air sinks, creating an area of low pressure.
-Warm air sinks, creating an area of low pressure.
-Cool air rises, creating an area of low pressure.
Answer:
-Warm air sinks, creating an area of low pressure.
Explanation:
Heat will weigh more, than cool air!
Write the name of flame used In charcoal cavity test.why?
Answer:
the reducing flame also called the carburizing flame.
Explanation:
because it gets the oxides of the unknown salts
What is the volume of an object that has a mass of 5.80 g and a density of 6.35 g/mL?
Answer:
1.09 mL
Explanation:
Density is a measure of a substance's mass over its volume.
d = m/v
We can rearrange the equation to solve for volume, using algebra.
v = d/m
Therefore v = 6.35/5.80 = 1.09 mL
A 25.00 mL sample of the ammonia solution
was accurately diluted to 250.0 mL. A 25.00mL
aliquot of the diluted ammonia solution was
placed in a conical flask. Indicator was then added
and the solution was titrated with 0.208 molL-1
hydrochloric acid. The indicator changed colour
permanently when 19.64 mL of the acid had been
added. Calculate the concentration of ammonia in
the original solution.
Answer:
1.634 molL-1
Explanation:
The mol ration between NH3 and HCl is 1 : 1
Using Ca Va / Cb Vb = Na / Nb where a = acid and b = base
Na = 1
Nb = 1
Ca = 0.208 molL-1
Cb = ?
Va = 19.64 mL
Vb = 25.00mL
Solving for Cb
Cb = Ca Va / Vb
Cb = 0.208 * 19.64 / 25.0
Cb = 0.1634 molL-1 (Concentration of diluted ammonia solution)
Using the dilution equation;
C1V1 = C2V2
Initial Concentration, C1 = ?
Initial Volume, V1 = 25.00 mL
Final Volume, V2 = 250 mL
Final Concentration, C2 = 0.1634 molL-1
Solving for C1;
C1 = C2 * V2 / V1
C1 = 0.1634 * 250 / 25.00
C1 = 1.634 molL-1
1. How many liters of a 0.50 M solution are needed to give 3.5 moles of solute?
Answer:
The volume of solution in liters required to make a 0.250 M solution from 3.52 moles of solute is 14.08 liters of solution
Explanation:
The question relates to the definition of the concentration of a solution which is the number of moles per liter (1 liter = 1 dm³) of solution
Therefore we have;
The concentration of the intended solution = 0.250 M
Therefore, the number of moles per liter of the required resolution = 0.250 moles
Therefore, the concentration of the required solution = 0.250 moles/liter
The volume in liters of the required solution that will have 3.52 moles of the solute is given as follows;
The required volume of solution = The number of moles of the solute/(The concentration of the solution)
∴ The required volume of solution = 3.52 moles/(0.250 moles/liter) = 14.08 liters
The required volume of solution to make a 0.250 M solution from 3.52 moles of solute = 14.08 liters.
Therefore the number of liters required to make a 0.250 M solution from 3.52 moles of solute = 14.08 liters.
If you have 12 atoms of hydrogen before a chemical reaction, how many atoms of hydrogen will be present
Answer:
12 atoms of hydrogen will be present in the product
Explanation:
12 atoms of hydrogen will be present in the product because the law of conservation of mass states that mass is neither created nor destroyed in chemical reactions.
The law of conservation states that the mass of the element remains the same during the course of the reaction.
The law of reaction conformed by the following:-
Mass of reactant Mass of productAccording to the question, the amount of hydrogen is 12 atoms in the reactant and the amount will remain the same at the end of the reaction, which is a product that is 12 atoms
Hence, the amount remains the same in the reaction that is 12 atoms
For more information, refer to the link:-
brainly.com/question/2817451
PLEASE HELP ASAP!!!!!!????
Answer:
The third one!
how many mols are in 100.g of Fe?
Answer:
1.79 moles
Explanation:
1.79 moles
1.79 moles
1.79 moles
1.79 moles
Answer:1.79 moles
1.79 moles are there in 100g of iron.
Explanation:
thats the answer for it
how many moles is 130g of cocl2
Answer:
1.3142 mol CoCl2
Explanation:
Well, to answer this we need to find out how many grams are in a single mole of CoCl2. Two find that we need to get the molar mass of CoCl2
Co = 28.0101 g Co per mole
Cl = 35.453 * g Cl per mole
28.0101 + 2 * 35.453 = 98.9161 g CoCl2 per mole
Now, we divide:
130/98.9161 = 1.3142 mol CoCl2
There are 1.31 moles in 130grams of cobalt chloride (CoCl2). Details about how to convert mass to moles can be found below.
How to calculate number of moles?The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass.
According to this question, there are 130g of CoCl2.
molar mass of CoCl2 = 28 + 35.5(2) = 99g/mol
moles = 130g ÷ 99g/mol
moles = 1.31 moles
Therefore, there are 1.31 moles in 130grams of cobalt chloride (CoCl2).
Learn more about number of moles at: https://brainly.com/question/14919968
What is the density of a book with a mass of 60g and a volume of 20 cm3? *
Answer:
[tex]3 g/cm^{3}[/tex]
Explanation:
Density is a measure of a substance's mass over its volume.
d = m/v
Therefore d = 60g/20cm3 = 3 g/cm3
Identifying Cell Structures
Which structures are found in plant colls, but not in animal cells? Check all that apply
)
coll wall
coll membrane
chloroplasts
O lysosomes
ribosomes
vacuoles
Answer:
cell wall and chloroplasts
Explanation:
most of the earth's landmasses is covered by a mixture of bits of rock and bit of once~living part of plants or animal. this material is called
and its not fossil
Give one example of
a) Homogeneous mixture of two elements
Answer:
honey
Coffee
blood
Explanation:
These components are uniformly distrubuted and these cannot be seperated unlike heterogeneous
What is the correct formula for the missing product from the equation below:
Na2CO3(aq)
+
CaCl2 (aq)
> NaCl +
Answer:
CaCO3 (s)
Explanation:
This equation is a double replacement equation, which means that since Na and Cl and paired, Ca and CO3 will be paired.
Then, you look at the charge of each element and balance
Ca has a 2+ charge
CO3 has a 2- charge
The 2+ charge and the 2- charge will cancel so there is no need for a subscript or to balance the equation
The complete equation will be Na2CO3 (aq) + CaCl2(aq) -> NaCl (aq) + CaCO3 (s)
I hope this helps and have a great day!
In a reaction 25.00mL of nitric acid required 51.4mL of 0.73M calcium hydroxide. Calculate the grams of nitric acid per liter of solution
Answer:
47.27 g HNO₃
Explanation:
The reaction between nitric acid (HNO₃) and calcium hydroxide (Ca(OH)₂) is the following:
2HNO₃(aq) + Ca(OH)₂(aq) → Ca(NO₃)₂ + 2H₂O(l)
According to the chemical equation, 2 moles of HNO₃ reacts with 1 mol of Ca(OH)₂. At the point of total neutralization, the total number of moles of HNO₃ reacts with the total number of moles of Ca(OH)₂:
2 x moles HNO₃ = moles Ca(OH)₂
The number of moles is equal to the product of molarity of the solution (M) and the volume in liters (V):
M(HNO₃) = ?
M(Ca(OH)₂) = 0.73 M
V(HNO₃) = 25.00 mL x 1 L/1000 mL = 0.025 L
V(Ca(OH)₂) = 51.4 mL x 1 L/1000 mL = 0.0514 L
So, we can write the equation at neutralization point as:
2 x (M(HNO₃) x V(HNO₃)) = M(Ca(OH)₂) x V(Ca(OH)₂)
From this, we can calculate the molarity of HNO₃:
M(HNO₃) = (M(Ca(OH)₂) x V(Ca(OH)₂))/2 x V(HNO₃)
= (0.73 M x 0.0514 L)/(2 x 0.025 L)
= 0.75 M HNO₃
We can convert the molarity from M (mol/L) to g/L by using the molecular weight of HNO₃:
Mw(HNO₃) = 1 g/mol H + 14 g/mol N + (3 x 16 g/mol O) = 63 g/mol
Finally, we multiply the molarity by the molecular weight to obtain the grams of nitric acid per liter of solution:
0.75 mol/L HNO₃ x 63 g/mol = 47.27 g HNO₃
Dipole-dipole interactions are (weaker than, stronger than, equal to) hydrogen bonds.
Answer and Explanation:
Dipole-Dipole interactions are weaker than hydrogen bonds.
Hydrogen bonds are a form of dipole-dipole interactions, being the strongest form of dipole-dipole interactions.
#teamtrees #PAW (Plant And Water)
when a rotting log was turned over, pill bugs, termites , ants , fungi , and earthworms were living there. the termites represent ____ in its
a. an environment
b. a population
c. a niche
d. an abiotic factor
Present in a state where it molecules are far apart during a change of state it's molecules slow down which change of state has most likely taken place from a gas to a liquid from a liquid to a gas from a solid to a liquid from a gas to a plasma
Answer:
The change of state that has occurred is from a gas to a liquid
Note: The question is incomplete. The complete question is given blow.
H₂O is initially present in a state where its molecules are far apart. During a change of state, its molecules slow down. Which change of state has most likely taken place?
from a gas to a liquid
from a liquid to a gas
from a solid to a liquid
from a gas to a plasma
Explanation:
Water can exists in three states: as gaseous water vapor, as liquid water, and as solid ice. Each of these states of water can be interconverted from one to another by the addition or removal of heat in a process known as change of state.
Liquid water can be converted to solid ice by the removal of heat, while solid ice ice can be converted to liquid water by the addition of heat. Also, liquid water can be converted to water vapor by the addition of heat, while water vapor can be converted to liquid water by the removal of heat.
Of the three states of water, the one in which the molecules are farthest apart is in the gaseous state. The molecules have high kinetic energy and move randomly while colliding with one another. When a heat is removed from these highly energetic molecules, the molecules slow down and lose some of their kinetic energy and a change of occurs from gaseous to liquid state.
Therefore, the change of state that occurred as described, is from gas to liquid.
Which of these statements describes a physical property of hydrogen? Group of answer choices it is found in acids. it is less dense than oxygen gas. it reacts with oxygen to form water. it is highly flammable.
Answer:
it is less dense than oxygen gas.
Explanation:
Hydrogen is the simplest chemical element that exists. The symbol for the chemical element Hydrogen is "H" and it is a colourless, tasteless, odorless, and highly flammable gas.
Hydrogen is a chemical element found in group (1) of the periodic table and as such it has one (1) electrons in its outermost shell. Therefore, Hydrogen has an atomic number of one (1) and a single valence electrons because it has only one proton and one electron in its nucleus.
In Chemistry, the properties of a chemical element that can be observed and measured without changing its chemical nature is known as a physical property. It includes density, color, freezing point, opacity, smell, melting point, viscosity, etc.
Hence, the statement which describes a physical property of hydrogen is that it is less dense (density) than oxygen gas.
in what two ways do minerals form
Answer:
Minerals can form in three primary ways being precipitation, crystallization from a magma and solid- state transformation by chemical reactions (metamorphism). Mineral Precipitation is when a mineral is formed by crystallization from a solution. Examples include quartz, halite (table salt), calcite, and gypsum.
Answer:
When magma cools slowly, deep below the surface, it has time to form large crystals in regular patterns. The second way that minerals form is through solutions. (A solution is when one substance is dissolved uniformly in a liquid.) When elements and compounds leave the solution, they can crystalize.
The diffusion of matter and energy in a liquid is slower than diffusion in a gas
True
O False
If an electron has an acceleration of 2.33 × 102 m/sec2, what is this value in units of m/min2?
Answer:
The electron has an acceleration of 838800 [tex]\frac{m}{min^{2} }[/tex]
Explanation:
An electron has an acceleration of 2.33*10² [tex]\frac{m}{sec^{2} }[/tex]
To be able to express in units [tex]\frac{m}{min^{2} }[/tex], you must carry out the conversion taking into account that 1 [tex]\frac{m}{sec^{2} }[/tex]= 3600 [tex]\frac{m}{min^{2} }[/tex]. Then you can apply the following rule of three: if 1 [tex]\frac{m}{sec^{2} }[/tex] equals 3600 [tex]\frac{m}{min^{2} }[/tex], 2.33 * 10² [tex]\frac{m}{sec^{2} }[/tex] equals how much [tex]\frac{m}{min^{2} }[/tex]?
[tex]\frac{m}{min^{2} }=\frac{2.33*10^{2} \frac{m}{sec^{2} }*3600\frac{m}{min^{2} }}{1\frac{m}{sec^{2} }}[/tex]
[tex]\frac{m}{min^{2} }=838800[/tex]
The electron has an acceleration of 838800 [tex]\frac{m}{min^{2} }[/tex]
Alia needs to order the following isotopes by atomic number. Use what you know about atomic number and
isotopes to drag and drop the tiles in order of increasing atomic number from lowest to highest.
Silver-109
Cadmium-106
Rhodium-122
Indium-110
Palladium-109
Answer:
Rhodium-122 < Palladium-109 < Silver-109 < Cadmium-106 < Indium-110
Explanation:
Atomic number - Number of protons.
The number displayed at the end of the element in this question represents the mass number (Number of protons + Number of neutrons).
The atomic number of the isotopes are given below;
Silver-109 --> 47
Cadmium-106 --> 48
Rhodium-122 --> 45
Indium-110 --> 49
Palladium-109 --> 46
Arranging in order of increasing atomic number from lowest to highest;
Rhodium-122 < Palladium-109 < Silver-109 < Cadmium-106 < Indium-110
do i have to know the chemical and physical properties of alloys? only chemistry students answer this.
Answer:
yes you do so you know how strong it is how maluble it's is so it can be customised to it's specific use
Answer:
alloy's properties are usually different from those of its component elements. Alloy constituents are usually measured by mass. Unlike pure metals, most alloys do not have a single melting point; rather, they have a melting range in which the substance is a mixture of solid and liquid.
physical properties of alloys:-Alloy steels have a wide range of special properties, such as hardness, toughness, corrosion resistance, magnetizability, and ductility. Nonferrous alloys, mainly copper–nickel, bronze, and aluminum alloys, are much used in coinage.
chemical properties of alloys:-Pure metals are useful but their applications are often limited to each individual metal's properties. Alloys allow metal mixtures that have increased resistance to oxidation, increased strength, conductivity, and melting point; Essentially any property can be manipulated by adjusting alloy concentrations.
dnt learn all thr properties.
these are the main properties..u can learn thse only. hope it will help u
Pleseee help me pretty please ✨
Answer:
6 N.
Every thing has equal and opposite reaction.
Answer:
The answer is C I believe, I do not know for sure but I think that is the answer..
I'm sorry if I'm wrong.
Explanation:
Help me please I’ll give brainliest answer
Answer:
the answer is c I believe