CHEMISTRY HIGH SCHOOL

How many 100 mg tetracycline capsules can be made from 1 kg of tetracycline? (A) 10
(B) 100
(C) 1,000
(D) 10,000
(E) 100,000

Answers

Answer 1
Answer: 1mg=10-3g
100mg=0.1g

1kg=1000g
=1000/0.1
=10,000(D)

Related Questions

Where do decomposers fit on the pyramid of trophic levels?
The mass and volume of each sample differ from the mass and volume of the other samples. Is it possible for each sample to contain 1 mol of each substance?No, because they have different masses.No, because they have different volumes.Yes, because the number of moles is not dependent on the mass or the volume.Yes, because the number of moles is only dependent on the mass per unit volume.
Hydrazine, N2H4, and hydrogen, H2O2, have been used as rocket propellants. They react according to the equation: H2O2 + N2H4 → N2 + H2O a. How many moles of N2 are formed from 0.0250 moles of N2H4? (0.0250) b. How many moles of H2O2 are required if 1.35 moles of H2O is to be produced? (0.675) c. How many moles of H2O are formed if 1.87 moles of N2 is produced? (7.48)
Which statement describes one acid-base theory?
Examples of chemical changes in nature

An ionic solid is placed in a beaker of water. Which of the following occurs when there is a strong attraction between the solute and the solvent?A. The solute melts.
B. The solute dissolves.
C. The solute remains intact.
D. The solute reacts to form a precipitate.

Answers

Answer: Option (B) is the correct answer.

Explanation:

An ionic solid is a substance which has ionic bonds, that is, formed by the transfer of electrons.

Ionic bonds have strong force of attraction because ionic solids have opposite charges which strongly attract each other.

When we dissolve ionic solid in a beaker of water, it completely dissociate into its ions because polar molecules or solutes dissolve in polar solvents.

For example, when NaCl is dissociated into ions then the reaction is as follows.

          NaCl \rightarrow Na^(+) + Cl^(-)

Thus, we can conclude that when an ionic solid is placed in a beaker of water then the solute dissolves in it.
The answer is B. the solute dissolves. The ionic solid has attraction between ions and when there is strong attraction between solute and solvent, the ion will separate and dissolve in water.

Which organism lived on Earth during the Paleozoic era? A. trilobite B. dinosaur C. pine tree D. octopus

Answers

A. Trilobite. .....
They existed before the dinosaurs.

Show the formulas of the reactants

Answers

Mg0 + NacI, hope it helps ffammmm!!!!

How does the nucleus of a copper atom compared to the nucleus of a nickel atom

Answers

Copper has 29 protons in the nucleus, while Nickel has 28 protons.

#1: Which of the following is the abbreviation for a unit of energy? A. K / B. °C/ C. W / D. cal............... #2: A 200 g block of a substance requires 1.84 kJ of heat to raise its temperature from 25°C to 45°C. Use the table attached to identify the substance. A. iron/ B. aluminum/ C. gold/ D. copper.....................#3: In a calorimeter, the temperature of 100 g of water decreased by 10°C when 10 g of ice melted. How much heat was absorbed by the ice? A. 418 kJ / B. 100 kJ / C. 10 J / D. 4.18 kJ ..................#4: The amount of heat needed to raise the temperature of 50 g of a substance by 15°C is 1.83 kJ. What is the specific heat of the substance? A. 2.44 J/g-°C / B. 2.22 J/g-°C / C. 2.13 J/g-°C / D. 2.05 J/g-°C ................#5: In a calorimeter, 3.34 kJ of heat was absorbed when 10 g of ice melted. What is the enthalpy of fusion of the ice? A. 6.68 J/g / B. 334 J/g / C. 6.68 kJ/g/ D. 334 kJ/g

Answers

Among the choices, the unit of energy is calories. Answer in 1) is D. In 2) we are given with te mass , heat and temperature change. we just need to get the heat capacity and compare it with the following metals. The calculated heat capacity is 0.46 kJ/kg K. The answer is A. iron. In 3) we can compute the heat absorbed by the formula ΔH=mCpΔT. Cp of water is 4.18 J/g K. Answer of 3) is D. In 4) the formula used in Cp=ΔH/mΔT. Answer in 4) is A. The heat of enthalpy of fusion of ice is 80 cal/g. We convert this to J/g. Answer  in 5) is B.334 J/g.

Answer:

1. D. cal......

2.A. iron

3. D

4.2.44j/g°C   A

5,Lf=334J/g   B

Explanation:

1: Which of the following is the abbreviation for a unit of energy? A. K / B. °C/ C. W / D. cal...............

calorie is the unit of energy

#2: A 200 g block of a substance requires 1.84 kJ of heat to raise its temperature from 25°C to 45°C. Use the table attached to identify the substance. A. iron/ B. aluminum/ C. gold/ D. copper.....................

Q=mcdt

1840=0.2*C*(45-25)

C=460J/KgK

if the specific heat capacity is the above then he substance is iron

#3: In a calorimeter, the temperature of 100 g of water decreased by 10°C when 10 g of ice melted. How much heat was absorbed by the ice? A. 418 kJ / B. 100 kJ / C. 10 J / D. 4.18 kJ .................

Q=mcdT

Q=0.1*10*4180

Q=4180j. answer D

.#4: The amount of heat needed to raise the temperature of 50 g of a substance by 15°C is 1.83 kJ. What is the specific heat of the substance? A. 2.44 J/g-°C / B. 2.22 J/g-°C / C. 2.13 J/g-°C / D. 2.05 J/g-°C ................

Q=mcdT

1830=50/1000*C*15

C=2440j/kg/k

change it to j/g°C

2.44j/g°C   A

#5: In a calorimeter, 3.34 kJ of heat was absorbed when 10 g of ice melted. What is the enthalpy of fusion of the ice? A. 6.68 J/g / B. 334 J/g / C. 6.68 kJ/g/ D. 334 kJ/g

Q=mLf

Lf=enthalpy of fusion

3340/10=Lf

Lf=334J/g   B

Enthalpy of fusion quantity of heat to convert 1 unit mass of a solid to liquid without any noticeable change in temperature.

What is the mole to mole ratio between nitrogen gas and hydrogen gas

Answers

Answer : The moles ratio between the nitrogen gas and hydrogen gas are, 1 : 3 respectively.

Explanation :

The balanced chemical reaction will be,

N_2(g)+3H_2(g)\rightarrow 2NH_3(g)

Mole ratio : It is defined as the ratio of the number of moles of the substances whose ratio is to be calculated.

In a chemical reaction, the stoichiometric coefficients represents the number of moles.

By stoichiometry of the reaction we can say that,

1 mole of nitrogen gas reacts with 3 moles of hydrogen gas to produce 2 moles of ammonia gas.

Hence, the mole ratio of between the nitrogen gas and hydrogen gas are, 1 : 3 respectively.

For instance you have a chemical reaction of N2 + 3H2 -> 2NH3. The number of moles of N2 is 1, H2 is 3 and NH3 is 2. The mole to mole ratio between nitrogen gas and hydrogen gas is 1/3 or 1 is to 3.
Other Questions
There are three types of plate boundaries. Which choice is NOT a type of plate boundary?A) convergent B) divergent C) thrust D) transform
Which planet's orbit around the sun is most nearly circular?
Which statement best describes the collisions of gas particles according to the kinetic-molecular theory? a. When particles pass close enough to one another, their attractions pull them together, and then they bounce apart with no gain or loss of energy. b. As particles travel in straight lines, their paths sometimes meet, and then they bounce apart with no gain or loss of energy. c. When particles pass close enough to one another, their attractions pull them together, and then they bounce apart with a loss of energy. d.As particles travel in straight lines, their paths sometimes meet, and then they bounce apart with a loss of energy.
It is possible for the mass of the reactants to be greater than the mass of the products during _________.a. phase changes b. fusion reactions c. fission reactions d. physical reactions E. chemical reactions