Physical or chemical change? what gave you the idea that it was such?
Answers
Answer:
chemical change
Explanation:
signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.
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Answer:
Chemical change
Explanation:
because it tranformed into something else
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Plants and algae that convert sunlight to food energy are called producers primary consumers tertiary consumers decomposers
When a car travels around a curve in the road what helps to keep the car driving in a curved path?
Explain what happens to a fixed sample of gas when its temperature changes.
Answers
Mass = moles x RFM
(RFM = Relative Formula Mass, or the total mass of a substance or element for example Cu=64)
Rearrange the formula to find the number of moles
Moles = mass/RFM
=6.4/64
= 0.1
chemically balance the following:
____ Mg(OH)2 + __ HCl → ____ MgCl2 + __ H2O
____ CH4 + ____ O2 → _____ CO2 + ____ H2O
___ Cu + ___ Br2 → ___ CuBr2
Answers
second one - CH4+2O2– 2H20
Third- is already balanced.
(2) pH of KCl(s)
(3) electrical conductivity of KCl(aq)
(4) electrical conductivity of KCl(s)
Answers
Answer: (3) electrical conductivity of KCl (aq)
Explanation: pH is the measure of acidity or alkalinity.
Conductance is the ability of a substance to be able to conduct electric current through it. Electrolyte is a solution which enables electric current to pass through them due to the presence of ions.
Ionic compounds do not conduct electricity in solid state as the ions are strongly held by strong coloumbic forces but in aqueous solutions they dissociate into ions and thus act as good conductors.
Answers
Answer:
$182 is the value of the gold in the coin
Explanation:
Diameter is 2r, the ratio of the coin is = 1.62cm / 2 = 0.81cm
Following the formula of the volume of the coin:
V = π r² h
V = π*(0.81cm)²*0.085cm
V = 0.172cm³ = mL
As the density of the gold is 19.32g/mL, the mass of 0.1752mL of gold is:
0.1752mL * (19.32g / mL) =
3.385g is the mass of the coin
As the price of the gold is $53.90 / g, the value of the gold in the coin is:
3.385g * ($53.90 / g) =
$182 is the value of the gold in the coin
Final answer:
To find the value of the gold in the coin, calculate its volume using the formula for the volume of a cylinder. The value of gold in the coin is $185.37.
Explanation:
To calculate the value of gold in the coin, we need to find its volume first using the formula for volume of a cylinder:
The radius (r) of the coin is half its diameter, so it is 0.81 cm. The height (h) is 0.085 cm. Plugging in these values, we can find the volume of the coin. Next, we calculate the mass of the gold in the coin using its density and the volume we just calculated. Finally, we multiply the mass by the price per gram of gold to find the value of the gold in the coin.
The volume of the coin is:
= 0.178 cm3.
The mass of the gold is:
m = density x volume
= 19.32 x 0.178
= 3.443 g.
The value of the gold in the coin is the value as -
= mass x price per gram
= 3.443 g x $53.90/g
= $185.37.
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They are made up of atoms of only one type of element.
They are made up of particles that are arranged in a repeating pattern.
They are made up of a random ratio of elements that are bonded together.
Answers
Hope my answer would be a great help for you. If you have more questions feel free to ask here at Brainly.
Ionic compounds are made up of particles that are arranged in a repeating pattern. Therefore, the correct option is option C.
A specific class of chemical compound known as an ionic compound is created when two or more atoms share electrons. It is made up of anions, which are negatively charged ions, and cations, which are positively charged ions. Most frequently, ionic compounds are created when a metal interacts with a non-metal. The non-metal atom receives one or more electrons to become an anion during this reaction, whereas the metal atom loses one or more electrons to become a cation. The development of a stable ionic compound happens as a result of the electrostatic forces that draw these oppositely charged ions to one another.
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(2) Br2(l) at 266 K (4) Br2(g) at 332 K