CHEMISTRY HIGH SCHOOL

A period is a horizontal row on the periodic table.
a. True
b. False

Answers

Answer 1
Answer: It is True because in the periodic table of elements, there are seven horizontal rows of elements called periods. The vertical columns of elements are called groups, or families.

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Which of these is NOT a physical property of matter?A) odor B) boiling point C) melting point D) ability to rust
Which barium salt is insoluble in water?
Which of the following an inorganic compound?CH3(CH2)3CH3 pentaneC6H12O6 glucoseC4H10 butaneH2O water molecule
The nucleus of 8Be, which consists of four protons and four neutrons, is very unstable and spontaneously breaks into two alpha particles (helium nuclei, each consisting of two protons and two neutrons). True or false?
What was the main reason the Federalists wantedto replace the Articles of Confederation?(1) The president did not have the power to vetolegislation.(2) The legislative branch enacted an unfair taxprogram.(3) The Supreme Court refused to payRevolutionary War debts.(4) The national government was too weak tosolve the nation’s problems.

The recommended daily requirement of calcium is1,000 mg. Tap water in a Midwestern city contains approximately 150 mgCa/L. A person living in the city who drinks two liters of water in oneday would receive ________ percent of his/her RDA of calcium. A. 3
B. 7.5
C. 15
D. 30

Answers

The answer is D. 30 percent

Which is true about fossil fuels? A.
Coal and natural gas came from swamp environments, while oil came from open oceans.

B.
Coal came from swampy environments, while oil and natural gas came from open ocean environments.

C.
Coal, oil, and natural gas came from swamp environments.

D.
Natural gas and oil came from swamp environments, while coal came from open oceans.

Answers

Which is true about fossil fuels? The statement that is true about fossil fuels is Coal came from swampy environments, while oil and natural gas came from open ocean environments. The answer is letter B. The rest of the choices is not true for fossil fuel 

The correct name for the molecule IgBr7 is:

Answers

Answer:

(iodine?) heptabromide

Explanation:

Not sure what element Ig is but use that name and then heptabromide.

Oxidation numbers are written as ____.

Answers

they are written as superscripts
(a symbol or a figure)

Calculate the molar solubility of calcium hydroxide in a solution buffered at each of the following pH's. pH 5, pH 7, pH 10

Answers

Calcium hydroxide dissolves and dissociates according to:
Ca(OH)₂(s) ⇄ Ca²⁺(aq) + 2 OH⁻(aq)  therefore the answer is PH7

Which statement best describes gamma radiation?(1) It has a mass of 1 and a charge of 1.
(2) It has a mass of 0 and a charge of –1.
(3) It has a mass of 0 and a charge of 0.
(4) It has a mass of 4 and a charge of +2.

Answers

The correct answer is option 3. Gamma radiation is a type of electromagnetic radiation which is characterized by having the smallest wavelength resulting to having the most energy in the electromagnetic spectrum. Gamma radiation has no mass and no charge.
Other Questions
The escape of molecules from the surface of a liquid is known as _____.A. Sublimation B. Condensation C. Evaporation D. Boiling
In the combustion of hydrocarbon, carbon monoxide is formed. What has occured?
According to astronomers , the age of the universe is estimated to be
2. The model on the right looks bumpy, but when you break a large salt crystal in two, the edges of the split often look straight and feel smooth. Is there a problem with the model?​