In an atom: The nucleus is made of electrons and protons. Protons have positive charges. Neutrons have negative charges. All of the above.

Answers

Answer 1

Answer:

Answer: (b) protons have positive charges

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Which of these 1 M solutions will have the highest pH? 1. NaOH 2. CH3OH 3. HCl 4. NaCl

Answers

1) NaOH
Sodium hydroxide is a very water soluble basis, undergoing ionic dissociation and releasing the ions : Na⁺ and OH⁻

hope this helps!

Summarize the main contributions of copernicus, brahe,kepler,galileo,and newton

Answers

Copernicus- developed heliocentric model, discovered the chemical element Copernicum has the symbol Cn and atomic number 112, started the scientific revolution.

Brahe- known for his precise and comprehensive astronomical and planetary observations, which heavily influenced future discoveries; built the maps of Hven that helps in accurate determinations of latitude and longitude.

Kepler - solved the mystery of the planets; believed the Solar System's planets orbited the sun in circular path that determined by an arrangement of the five platonic solids.

Galileo - Father of Modern Science; discovered the first moons ever known to orbit a planet other than Earth; first person to study the sky with a telescope; discovered the rings of Saturn; our moon has mountains; Milky Way is made up of stars; established that everything falls to the ground at the same rate regardless of weight; identified the parabola; proposed theory of relativity; discovered pendulums; tried to measure the speed of light; showed the set of perfect squares.

Newton- generalized the binomial theorem; showed sunlight is made up of all the colors of the rainbow; discovered the law of gravitation; Laws of motion and calculus.

Which of these formulas contains the most polar bond?
(1) H–Br (3) H–F(2) H–Cl (4) H–I

Answers

The answer is H—F. Fluorine is the most electronegative of the four halogens (and, in fact, of all the elements), so it does the best job of gathering the shared electrons to itself. Therefore, the bond with F is the most polar

Which compound has the highest percent composition by mass of strontium?(1) SrC12 (2) SrI2 (3) SrO (4) SrS

Answers

The answer is (3). The number of Sr is the same so if the compound has the smallest gram formula mass, it has the highest percent composition by mass of strontium. So the answer is (3).

Answer: option (3) SrO, with 84.56%

Explanation:

You have to calculate the mass of strontium and the mass of the compound, for each of the four compounds, and compute the percent:

percent of strontium = (mass of strontium / mass of the chemical formula) × 100 %.

These are the atomic masses of the elements that you have to use:

Atomic mass of Sr: 87.62 g/mol

Atomic mass of Cl: 35.453 g/mol

Atomic mass of I: 126.904 g/mol

Atomic mass of O: 15.999 g/mol

Atomic mass of S: 32.065 g/mol

(1) SrCl₂:

i) mass of Sr: 87.62 g/mol

ii) mass of Cl₂: 2×35.453 g/mol = 70.906 g/mol

iii) mass of SrCl₂: 87.62 g/mol + 70.906 g/mol = 158.526 g/mol

iv) Sr % = [87.62 / 158.526 ] × 100 = 55.27%

(2) SrI₂

Following the same procedure:

i) Sr % = [87.62 / (87.62 + 2× 126.904) ] × 100 = 25.66%

(3) SrO

i) Sr % = [87.62 / (87.62 + 15.999) ] × 100 = 84.56%

(4) SrS

i) Sr % = [87.62 / (87.62 + 32.065) ] × 100 = 73.21%

According to one acid-base theory, a base is an(A) $H^+$ acceptor
(B) $Na^+$ acceptor
(C) $H^+$ donor
(D) $Na^+$ donor

Answers

A. Proton acceptor and this is according to the bronsted Lowry theory

Which is evidence that a chemical Reagan occurred?A. A phase change occurs
B. A new gas is observed in the form of bubbles
C. Red and yellow paint mixing to make orange
D. The temperature of the substance remains constant updates

Answers

To solve such this we must know the concept of chemical reaction. Therefore, the correct option is option B that is a new gas is observed in the form of bubbles.

What is chemical reaction?

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

The characteristics of chemical reaction are:

Evolution of a Gas

Change in temperature

Change in color

Formation of Precipitate

The evidence that a chemical reaction has occurred is a new gas is observed in the form of bubbles.

Therefore, the correct option is option B that is a new gas is observed in the form of bubbles.

Learn more about the chemical reactions, here:

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