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3 years ago

Ms. Crawford gave the following instructions to her science class:

Chemistry

2 answers:

vekshin13 years ago

8 0

A — a change in state is a good indicator of a chemical change

algol [13]3 years ago

6 0

A- the gas produced caused the balloon to blow up

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Which lists only metalloids?

enot [183]

Answer:

boron (B), germanium (Ge), and tellurium (Te)

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2 years ago

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Choose the correct coefficients to balance the following equation:

umka21 [38]

B) 1 Zn+ 2HCl--> 1 ZnCl2+1H2 This is balanced

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3 years ago

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10g of a non-volatile and non-dissociating solute is dissolved in 200g of benzene.

ehidna [41]

<u>Answer: </u>The molar mass of solute is 115 g/mol.

<u>Explanation:</u>

Elevation in the boiling point is defined as the difference between the boiling point of the solution and the boiling point of the pure solvent.

The expression for the calculation of elevation in boiling point is:

$\text{Boiling point of solution}-\text{boiling point of pure solvent}=i\times K_b\times m$

$\text{Boiling point of solution}-\text{Boiling point of pure solvent}=i\times K_f\times \frac{m_{solute}\times 1000}{M_{solute}\times w_{solvent}\text{(in g)}}$ ......(1)

where,

Boiling point of pure solvent (benzene) = $80.10^oC$

Boiling point of solution = $81.20^oC$

i = Vant Hoff factor = 1 (for non-electrolytes)

$K_b$ = Boiling point elevation constant = $2.53^oC/m$

$m_{solute}$ = Given mass of solute = 10 g

$M_{solute}$ = Molar mass of solute = ? g/mol

$w_{solvent}$ = Mass of solvent = 200 g

Putting values in equation 1, we get:

$81.20-80.10=1\times 2.53\times \frac{10\times 1000}{M_{solute}\times 200}\\\\M_{solute}=\frac{1\times 2.53\times 10\times 1000}{1.1\times 200}\\\\M_{solute}=115g/mol$

Hence, the molar mass of solute is 115 g/mol.

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3 years ago

Explain the relationship between dominant and recessive genes and their role in heredity. HELPPPPPPPP

Rudik [331]

Dominant refers to the relationship between two versions of a gene. Individuals receive two versions of each gene, known as alleles, from each parent.

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3 years ago

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Diabetes mellitus chacterized by too much glucose buildup in the blood. In

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Not exactly sure of the question your asking.

diabetes insipidus (more commonly known simply as diabetes)
Defined:
The pancreas fails to produce the correct amount of insulin which is needed to control the amount of glucose, or sugar needed in the blood.

Diabetes mellitus: a rare condition & more importantly has nothing do do with the pancreas or blood sugar.

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2 years ago