A test tube containing CaCO₃ is heated until the entire compound decomposes. If the test tube plus calcium carbonate originally weighed 30.08 grams and the loss of mass during the experiment was 4.40 grams, what was the approximate mass of the empty test tube?A. 20.08 g
B. 21.00 g
C. 24.50 g
D. 25.08 g
E. 25.68 g
Can anyone explain this one for me?

Answers

Answer 1

Answer: Find the molar mass of CaCO3 then subtract the molar mass what it originally weighed and the loss of mass. Hopefully this works!

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What is the molarity of a solution that contains 0.50 mole of Naoh in 0.5p liter of solution

What is the equation to determine the MA of a wedge?MA= length - width

MA= Length+ width

MA= Length * width

MA= Length/ wisth

Answers

Answer:

length/width

Explanation:

Answer:

Length/Width

Explanation:

I did the module 10 exam so I know it is length/width

Why does a frog have 2 lives

Answers

They start their life in the water as a tadpole, then they adapt to land and go through metamorphosis to become a frog.

What is the weight on Earth of an apple with mass 150g?

Answers

Answer:
Gravitational Force = 1.47 N
Acceleration produced in Apple = 9.8 m/s^2
Acceleration produced in Earth = 2.45 x 10^(-23) m/s^2
Explanation:
Mass of Apple = 150 g = 0.15 Kg
Mass of Earth = 6 x 10^24 Kg
Radius of Earth = 6.38 x 10^6 m
Universal Gravitational Constant G = 6.67 x 10^-11 Nm^2/kg^2
Force due to gravity = G (mass of apple) (mass of earth) / (radius of earth)^2
We know that G (mass of earth) / (radius of earth)^2 = g = 9.8 m/s^2
So F = 9.8 (mass of apple) = 1.47 N
Gravitational Force = 1.47 N
By 2nd law of motion F = ma, a = F/m
Acceleration produced in Apple = F / (mass of apple) = 1.47 N / 0.15 Kg = 9.8 m/s^2
Acceleration produced in Earth = F / (mass of earth) = 1.47 N / 6 x 10^24 Kg = 2.45 x 10^(-23) m/s^2

Weight=mass x gravitational field strength

Gravitational field strength= 10N/kg

150/1000= 0.15kg
0.15kg x 10= 1.5N

(Weight is measured in Newton’s)

Some scientific evidence suggests that our universe is ever-expanding from a hot and dense initial state. Briefly describe at least one piece of evidence that supports the theory known as the Big Bang.

Answers

cosmic microwave background radiation (CMBR) is one piece of evidence for the big bang

Answer:

Cosmic microwave background and Hubble's Law.

Explanation:

Microwave background is basically electromagnetic radiation, but it's the remanent from earlier periods of the universe, they are the oldest electromagnetic wave in the Universe. Also, Hubble's Law says that the Universe faster galaxies are those are further away, because they belong to the first period of the explosion.

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Answers

Answer : Option a) True.

Explanation : A placebo is a substance that is unlikely to affect the dependent variable. True as in a clinical trial for any change in the placebo arm is known as the placebo response, and the difference between this placebo response and the result of no treatment is called as the placebo effect. Therefore, a placebo may be given to any person in a clinical context in order to deceive that recipient into thinking that it is an part of active treatment. It actually resembles a drug but is not an actual active drug, so, it is clear that it will not affect dependent variable.

True. A placebo is a substance used to ensure that the independent variable is what is affecting the dependent variable. Usually used in drug trials

Which type of radiation is the smallest in size?

Answers

Answer : The radiation which is smallest in the size is, Gamma radiation.

Explanation :

Alpha particle : It is also known as alpha radiation or alpha ray that consists of 2 protons and 2 neutrons that are bound together into a particle that is identical to the helium nucleus. It is produced in the process of alpha decay.

Beta particle : It is also known as beta radiation or beta ray. During the beta decay process, a high energy and speed electron or positron are emitted by the radioactive decay of atomic nucleus.

Gamma particle : It is also a gamma radiation or gamma ray that is arising from the radioactive decay of atomic nuclei. It has shortest wavelength waves and imparts high photon energy can pass through most forms of matters because they have no mass.

The increasing order of the particle size of the alpha, beta and gamma particles will be :

Gamma particle < Beta particle < Alpha particle

Hence, the radiation which is smallest in the size is, Gamma radiation.

Beta particles is the smallest type of radiation as its just electron/s. Alpha particles and Gamma rays are larger than beta particles. Alpha particles is a helium nuclei and we know that iodine-131 is an example of gamma rays. SO beta particles are smaller than a helium nuclei and a Iodine atom.

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