What is the law of conservation of mass

Answers

Answer 1

Answer: The law of conservation of mass States that mass in an isolation system is neither created nor destroyed by chemical reactions or physical transformations and the mass of the products in a chemical reaction must equal the mass of the reactants.

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_____ is the time required for one-half of the atoms of a radioisotope to decay to products. a. fusion
b. radioactivity
c. half-life
d. fission

Answers

C half life..............................

Diatomic gases such as H2(g), O2(g), and N2(g) contain ________ bonds.

Answers

Diatomic gases contain covalent bonds. Take for example hydrogen atoms. They have one electron, which leads to the electron configuration 1s. This atom will gain stability by sharing its electron valence with other equal atom which is also willing to gain stability by sharing its valence electron. Then two atoms of hydrogen share their valence electrons to form a diatomic molecule through a covalent bond.

Uncontrolled hypertension can lead toA. heart attack.
B. stroke.
C. kidney damage.
D. all of the above.

Answers

All of the above,this can lead to stokes, heart attacks and kidney damage.
Hypertension puts pressure on the blood vessel walls which can damage them, the vessels in your heart, brain and other organs can be damaged by uncontrolled hypertension.

For the precipitation lab, what would be an appropriate use of a beaker?

Answers

For chemical changes like precipitation, appropriate use of a beaker is to provide space for the precipitate to form and for the color of the precipitate to be distinct.

Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.

There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

Thus, appropriate use of a beaker is to provide space for the precipitate to form and for the color of the precipitate to be distinct.

Learn more about chemical changes,here:

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The orderly geometric arrangement of atoms is called a crystalline solid. a. True
b. False

Answers

True
A) This fact is always true

Which of the following devices can measure only atmospheric pressure? A. Pressure gauge B. Barometer C. Tire gauge D. Mercury tube

Answers

B.) Barometer

Hope that helps :-)

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If you have 3.50 moles of hydrogen and 5.00 moles of nitrogen to produce ammonia, how much ammonia (in grams) is produced? 3H2 + N2 --> 2NH3