In what way did alchemists contribute to the development of modern chemistry?a. explained changes to matter in mystical, philosophical, or religious terms
b. created models of the internal structure of atoms
c. used experiments to analyze the relationship between gas pressure and volume
d. developed practical equipment, new procedures, and methods of identifying unknown substances

Answers

Answer 1

Answer: The correct answer is d. developed practical equipment, new procedures, and methods of identifying unknown substances

Although they were interested in mysticism, there was no place for it in science and they did not explain it in such manners. They also did not create models and didn't deal with gas pressure and volume. They mostly tried to change chemical properties of one chemical into another.

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Arteries are elastic because of the interior layer of______ tissue.

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Fission and Fusion of Atomic Nuclei:Please help! 26 points
Will mark brainliest to correct answers

1. What happens in a chain reaction?
A) Products that start a new reaction are released.
B) Reactants that have two parts split
C) Products that are radioactive are lost
D) Radioactive reactants are deposited on control rods

2. Which type of coolant(s) usually is (are) used to remove heat from nuclear reactor core?
A) water only
B) liquid sodium only
C) liquid sodium or water
D) CFCs

3. A reaction that results in the combining of smaller atomic nuclei is ___.
A) chemical
B) fission
C) fussion
D) ionization

4. What does neutron absorption accomplish in a nuclear reactor?
A) It slows down the reaction.
B) It speeds up the reaction
C) It increases the rate of heat absorption
D) It recycles the fuel

Answers

Answer:

C B A D

Explanation:

An ongoing series of fission reactions is called an

Answers

A chain of reaction (can easily get out of control)

What mass of solute is needed to prepare each of the following solutions? a. 3.00 L of 0.125 M K2SO4 b. 550 mL of 0.015 M NaF c. 700 mL of 0.350 M C6H12O6

Answers

a.
M = 0.125 M
V = 3.0 L
M=n/V(L) ⇒ n = 0.125 mol/L *3.0L = 0.375 mol

MM of K2SO4

K2 = 2* 39 = 78 g/mol
S= 32 g/mol
O4 = 4*16 = 64 g/mol

MM = 78g/mol + 32g/mol + 64g/mol =174 g/mol

mass = n*MM = 0.375 mol*174 g/mol = 65.25 g

b.
M= 0.015 M
V = 0.55L

n = 0.015 mol/L * 0.55L = 0.00825 mol

MM NaF

Na: 23g/mol
F: 19 g/mol

MM = 23g/mol + 19g/mol = 42g/mol

mass = n * MM = 0.00825 mol * 42g/mol = 0.3465 g

c.

n = M*V(L) = 0.350 mol/L * 0,700L = 0.245 mol
MM = 6*12 g/mol + 12*1g/mol + 6*16g/mol = 180 g/mol

mass = n*MM = 0.245 mol * 180g/mol = 44.1 g

According to Table I, which equation represents a change resulting in the greatest quantity of energy released? 2C(s) + 3H2(g) → C2H6(g) 2C(s) + 2H2(g) → C2H4(g) N2(g) + 3H2(g) → 2NH4(g) N2(g) + O2(g) → 2NO(g)

Answers

The answer is N2+3H2->2NH4. You can get the heat change on Table I. After checking the table I, you can get the ΔH for every reaction. The positive sign means absorbing energy and negative sign means releasing energy.

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.

Answers

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

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