CHEMISTRY HIGH SCHOOL

When magnesium ribbon is ignited, it gives off a white fume of magnesium oxide. What is this type of reaction? synthesis reaction double displacement reaction decomposition reaction single displacement reaction

Answers

Answer 1
Answer: It is an oxidation reaction 

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How many molecules in a mole?​
Charles's law states that A-Volume decreases as pressure decreases B-Volume decreases as temperature increasesC- Pressure and temperature are inversely proportionalD- Volume increases as temperature increases
Complete and balance the following equation: BrO3−(aq)+N2H4(aq)→Br2(l)+N2(g)

What is the simplest whole-number ratio of atoms in a molecule or formula unit called?

Answers

Answer: Empirical formula

Empirical formula referst to the simplest whole-number ration of atoms in a molecule. A compound's molecular formula can either be the same or multiple of its empirical formula. The structural and molecular formulas are also part of the compound formulas
Hi there! The simplest whole-number ratio of the atoms in a molecule of formula is called the Empirical formula.

What is the charge on an electron?

Answers

Answer

1.60217662 × 10-19 coulombs

Explanation:

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Physical or chemical change? what gave you the idea that it was such?​

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Answer:

chemical change

Explanation:

signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.

Give me brainliest plz

Answer:

Chemical change

Explanation:

because it tranformed into something else

Which statement describes a major drawback of the Bohr model that caused scientists to replace it?a) It worked only for helium and larger atoms.
b) It did not identify the distance between an electron and the nucleus.
c) It contradicted the Heisenberg uncertainty principle.
d) It stated that spectral lines of atoms are similar.

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The statement that best describe a major drawback of the Bohr model that caused scientists to replace it is it did not identify the distance between an electron and the nucleus. The answer is letter B. The rest of the choices don not answer the question above.

Answer: C

Explanation: Just took it

Boron occurs naturally as two isotopes. What is the difference between these isotopes?

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Answer: The two isotopes of boron differs in mass number rather than atomic number.

Explanation:

Isotopes are defined as the chemical species that have same atomic number but differ in their mass number.

Boron is the 5th element of the periodic table and have 2 naturally occurring isotopes. The isotopes are : B-10 and B-11

For _5^(10)\textrm{B} isotope:

Percentage abundance of this isotope = 20 %

Atomic number = 5

Mass number = 10

For _5^(11)\textrm{B} isotope:

Percentage abundance of this isotope = 80 %

Atomic number = 5

Mass number = 11

Hence, the two isotopes of boron differs in mass number rather than atomic number.
"They have different numbers of neutrons and different mass numbers.  Remember mass number is protons plus neutrons. The number of protons for an element will never change, however the number of neutrons can." I took the test, its D

Acids form __________ ions in water.a. hydrogen
c. positive
b. hydroxide
d. both a and c

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Hydroxide is for bases, so that is wrong. Hydrogen is for acids, which is correct. 

Answer: Hydrogen 

answer: THIS IS CORRECT I TOOK THE TEST D: BOTH A AND C

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