Answer:
Temperature is one of the major factors that affects the rate of change of the liquid colour, this is because ; like when if you freeze hot water the ice formed will be clear transparent, while on the other hand, if we freeze cold water it would be foggy inside the ice. This change occurs because of the temperature difference of the cold and hot water.
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Which property of a substance can be determined using a pH indicator ?
Density
Acidity
Electrical Conductivity
Thermal Conductivity
Boiling Point
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Answer: i think b.
Explanation:
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Answer: 35. it is 100°C
36. there is 7 periods in the periodic table
37. A heterogeneous mixture consists of visibly different substances or phases. ... Solutions have particles which are the size of atoms or molecules - too small to be seen. Oil and water form a heterogeneous or cereal and milk also makes a heterogeneous. a example of solution mixture is salt and water or rubbing alcohol.
38. A two phase mixture is a mixture of two different substances. An example of a two phase mixture would be a soft drink. It is a liquid and a gas. To separate these two substances you could heat the liquid and then capture the carbon dioxide.
Explanation:
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can someone call me and help me with chemistry
860-833-8822
Answer: okay
Explanation:
Answer:
What exactly do you want help with
Explanation:
What are some identifying factors of Sodium (Na)
Explanation:
what causes Spanish-American War
How many moles of sodium hydroxide, NaOH, are in a 35.65 g sample
of NaOH? (The molar mass of NaOH is 40.01 g/mol.)
Answer:
0.8910 mols of NaOH in a 35.65 g sample of NaOH
Explanation:
Mass off NaOH = 39.997
given = 35.65 g of NaOH
35.65 g of NaOH * 1 mol NaOH = 0.8910, since there are 4 sig figs.
/40.01 g
A 35.65 g sample of NaOH contains 0.8910 moles of NaOH.
What is mole?The mole, denoted by the sign "mol," is the volume of a system that has the same number of atoms in 0.012 kilograms of carbon-12 as there are elementary particles.
The mole, often known as mol, is a SI unit used to measure how many particles are present in a given substance. A mole is made up of 6.02214179 atoms or other fundamental building blocks like molecules.
Mass off NaOH = 39.997
given = 35.65 g of NaOH
No of moles of NaOH =35.65 g of NaOH × 1 mol NaOH /40.01 g
No of moles of NaOH = 0.8910 moles.
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Water
Specific Heat (J/c "C)
4.184
How much heat is needed to change the temperature of 50.0 g of water to 20.0°C
Answer:
The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs.
Explanation:
The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs.
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Select all the correct answers.
Which of these are examples of mixing and separating?
removing seed casings from grains
a soda bottle bubbling when it is opened
a bright copper statue turning green from weathering
removing salt from seawater
water decomposing to oxygen and hydrogen
Answer:
the answer is
removing seed casings from grains
removing salt from seawater
Explanation:
This question is regarding mixing and separating such as a physical change.
a soda bottle bubbling is a chemical reaction
copper statue is a chemical reaction
water decomposing to oxygen and hydrogen is also a chemical reaction
this question is talking about mixing and seperating as a physical change
calculate the number of molecules in 52 gram of helium
Answer:
The molar mass that is the mass of 6.022 X 1023 atoms of helium is 4g. Hence 1 mole of He = 4 g of He = 6.022 X 1023atoms of He.
1 g of He = (6.022 X 1023) / 4 atoms of He.
52 g of He = (6.022 X 1023X 52 ) / 4 atoms of He.
Explanation:
Which of the following distinguishes an element from all other elements?
Its number of protons.
O
Its color in solid form.
o
Its phase at room temperature.
Its group in the Periodic Table.
Previous Question
Next Question
Answer:
Explanation:
The second best answer is its group on the periodic table.
That answer depends on the actual reason. The number of protons determines which element you are talking about.
What type of energy results from the burning of wood or gasoline?
electric
nuclear
chemical
Answer:Electric
Explanation: Its right.
Chemical energy results from the burning of wood or gasoline. Therefore, option (C) is correct.
What is chemical energy?Chemical energy is described as the energy which is stored in the chemical bonds formed in the chemical compounds. It is liberated during the chemical reaction and produces heat as a side-product which is known as an exothermic reaction.
Examples of chemical energy are biomass, natural gas, batteries, petroleum, and coal. When chemical energy is released from a compound, it is transformed into a completely new substance.
While burning wood or fuel, the chemical energy in the wood or gasoline is liberated as heat because of the chemical reaction of oxygen in the air and wood. This kind of chemical reaction is known as a combustion reaction. Combustion reaction converts the chemical energy stored in the wood into light energy and heat.
Therefore, in the burning of wood or gasoline, chemical energy is emitted.
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When we have stomach disorder, we take antacid to solve the problem. How does it help? Support your answer with an equation.
Answer:
idk
Explanation:
A certain atom has 20 electrons, 21 neutrons, and 20 protons. What is the atomic mass of the atom?
Which of the following statements about matter at
room temperature is true?
a. A solid has a definite volume, but a liquid's
volume can change.
b. Both a solid and a liquid Have a definite shape.
c. A solid has a definite shape, but a liquid's shape
can change.
d. Both a solid and a liquid have volumes that can
change.
e. A solid's shape can change, but a liquid has a
definite shape.
Answer: D
Explanation: If there was ice, the volume will change, if there was liquid (ex: water), it wouldn’t melt.An unknown element has two isotopes. The first isotope has a mass of 68.926 amu and an abundance of 60.108%. The second isotope has a mass of 70,925 amu and an abundance
of 39.892%. Calculate the average atomic mass AND identify the element.
Answer:
69.72344108
Gallium
Explanation:
What is a mole in chemistry
Answer:Mole, also spelled mol, in chemistry, a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.
Explanation:
what is the primary difference between and hypothesis and a theory
A hypothesis, on the other hand, is similar to a theorem, but it stands pretty much on its own and is not known to be linked to other theorems in any way. A hypothesis usually has no compelling reasons to be true or false. Hypotheses can be classified into the following categories:
The degrees of freedom of a theory have not yet been determined. These could be properties of a theory that haven't been fully determined yet. A theory can be expressed in a finite number of ways, and accepting one of them is referred to as "forming a hypothesis." It's about the aspects of a hypothesis that aren't fully formed yet.Once evidence is discovered, a hypothesis may evolve into a theory.A hypothesis that could become a theory if a mathematical formulation can be established.A hypothesis based on common sense and known theories that is not intended to become part of a bigger theory, but rather to explain a single fact. This could include things like beliefs regarding the formation of the earth.A theory derives a large number of predictions from a limited number of theorems or assumptions, which fall into the following categories:
Things we already knew to be true and can be explained by other theories.Things we previously knew to be true, but which no other theory could explain or predict.Things that we didn't know were true but were later confirmed to be true.Things we didn't realize were true, and don't know if they are still true, but don't contradict current measurements.Which property is the least reliable method for identifying a mineral
A. color
B. luster
C. streak
D. cleavage
Answer:
I think it is a color but I'm not completely sure
Answer:
Color
Explanation:
How much will it cost in American dollars(USD) to fill a 15 gallon tank of gasoline in Canada, if the price of gasoline there is $1.07 Canadian dollars (CAD) per liter. The current exchange rate is ($1.00(USD)= $1.34(CAD), 1 L=1.06 qts, 1.61 Km= 1 Mile, 1 gal= 4 qts]
Answer:
It will cost 45.37 US dollars (USD) to fill a 15 gallon gas tank in Canada.
Explanation:
Two values are directly proportional when when one value increases, the other increases in the same proportion, or when one value decreases, the other decreases in the same proportion.
The rule of three makes it possible to solve proportionality problems effectively and quickly. It is a method of calculating an unknown value that is directly proportional to another known value.
Then, knowing the data a, b and c, and the fourth unknown data x, which will be the unknown to be solved, this value is calculated as:
a ⇒ b
c ⇒ x
So: [tex]x=\frac{c*b}{a}[/tex]
You must calculate the cost in US dollars (USD) to fill a 15 gallon gas tank in Canada. You know that the price of gasoline is $1.07 Canadian dollars (CAD) per liter. If 1 L equals 1.06 qts, then you can say that the price of gasoline is $ 1.07 Canadian dollars (CAD) per 1.06 qts.
You can now apply a rule of three as follows: if 4 qts is equal to 1 gal, 1.06 qts is equal to how much gal is?
[tex]gal=\frac{1.06 qts*1 gal}{4 qts}[/tex]
gal= 0.265
Then you can say that the price of gasoline is $ 1.07 Canadian dollars (CAD) per 0.265 gal. So you can apply the following rule of three: if 0.265 gal costs $ 1.07 Canadian dollars (CAD), 15 gal how many Canadian dollars cost?
[tex]CAD=\frac{15 gal*1.07 CAD}{0.265 gal}[/tex]
CAD= $60.8 CAD
Finally, you can apply the following rule of three: if $ 1.34 (CAD) is equal to $ 1.00 (USD), $ 60.8 (CAD) is equal to how many US dollars (USD)?
[tex]USD=\frac{60.8 CAD*1USD}{1.34 CAD}[/tex]
USD= 45.37
It will cost 45.37 US dollars (USD) to fill a 15 gallon gas tank in Canada.
The invention of the microscope allowed scientists to see and study cells. True or false
Answer:
True
Explanation:
What is the density of a rectangle solid with dimensions
of 15 cm x 25 cm x 5 cm and has a mass of 3000 g?
Answer:
5625000gm/cm^3
Explanation:
volume=w*h*l=25*15*5=1875cm^3
density=mass*volume
=1875*3000
=5625000gm/cm^3
The Earth revolves in a path called_________around the sun.
Fill in the blank
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Answer:
Revolution that is it
In a one or two paragraph summary explain why Sodium light is Orange and Potassium light is lilac when placed in a flame.
Use the words: electron, quantum jump, ground state, orbitals, photons, emitting, absorbing, light spectrum, energy mass (words are not in order)
Answer:
?
Explanation:
How many molecules in a mole?
Answer:
One mole of a substance is equal to 6.022 × 10²³ units of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant.
Explanation:
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what is balance equation and how we balance equation
Answer:
To adjust the substance condition, you need to ensure the quantity of molecules of every component on the reactant side is equivalent to the quantity of particles of every component on the item side. To make the two sides equivalent, you should duplicate the quantity of particles in every component until the two sides are equivalent.
Explanation:
I NEED HELP! An iron cube is placed in liquid water. Which particles have the higher kinetic energy?
Answer:
Liquid water has higher kinetic energy thn iron cube
Explanation:
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Formula for:
* Density: D = M/V?
* Mass: ?
* Volume?
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If I use warm water on my plants then they will grow faster as hot water increases metabolism." This is an example of
Question 1 options:
a hypothesis
a theory
a research question
a scientific explanation
Answer:
a hypothesis
Explanation:
A hypothesis is a statement that is supposed or assumed before conducting any experiment. It is the assumption that is made on the basis of certain knowledge and controlled evidence in the initial time of the experiment. The initial assumption helps in taking the experiment or the investigation further. The truth is not ascertained in the initial phase rather the completion of the investigation is necessary to make a hypothesis turn into a theory.
In the given situation, the statement given is a hypothesis because the use of the warm water for the growth of the plants is the assumption made with respect to the metabolism effect on the humans.
Which pair of elements have the same number of atomic orbitals?
A.
Silver and strontium
B.
Sodium and strontium
C.
Silver and sulfur
D.
Sulfur and strontium
Answer:
B I think
Explanation:
Answer:
B, I'm guessing by their characteristics
Use what you know about periodic trends and the periodic table to answer the questions below.
Which atom attracts electrons most strongly when bonded?
oxygen (O)
magnesium (Mg)
Answer:
oxygen (O)
Explanation:
Answer:
A) oxygen (O)
Explanation:
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