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3 years ago

Which of the following statements is not part of Dalton's atomic theory? ( points)

1 answer:

4 0

The answer is "different atoms come together to form an element"- it is wrong because elements are made up of the same atoms.

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f a cup of coffee is at 90°C and a person with a body temperature of 36°C touches it, how will heat flow between them?

coldgirl [10]

The heat flows between the two by the cup. The cup gives the coffee heat to the person and vise versa.

Hope this helps!

3 0

3 years ago

A lahar is a type of mudflow that occurs

Fittoniya [83]

I'd guess A or D, but my gut says A

7 0

3 years ago

Read 2 more answers

When 0.49 g of a molecular compound was dissolved in 20.00 g of cyclohexane, the freezing point of the solution was lowered by 3

IRISSAK [1]

Answer: The molecular mass of this compound is 131 g/mol

Explanation:

Depression in freezing point:

$\Delta T_f=i\times k_f\times \frac{w_2\times 1000}{M_2\times w_1}$

where,

$\Delta T_f$ = depression in freezing point = $3.9^oC$

$k_f$ = freezing point constant = $20.8^0C/m$

m = molality

i = Van't Hoff factor = 1 (for non-electrolyte)

$w_2$ = mass of solute = 0.49 g

$w_1$ = mass of solvent (cyclohexane) = 20.00 g

$M_2$ = molar mass of solute = ?

Now put all the given values in the above formula, we get:

$(3.9)^oC=1\times (20.8^oC/m)\times \frac{(0.49g)\times 1000}{M_2\times (20.00g)}$

$M_2=131g/mol$

Therefore, the molar mass of solute is 131 g/mol

7 0

2 years ago

A test tube filled with water is placed over a funnel filled with water and a green plant called Elodea. When the plant is expos

Stells [14]

Answer: The bubbles produced are most likely due to oxygen.

Explanation:

Photosynthesis is a phenomenon in which green plants containing chlorophyll use sunlight as a source of energy to convert carbon dioxide and water to form glucose and oxygen.

The balanced chemical reaction for photosynthesis is:

$6CO_2+6H_2O\rightarrow C_6H_{12}O_6+6O_2$

Thus the bubbles produced are most likely due to oxygen.

5 0

2 years ago

Nitrogen dioxide gas is formed by reaction of nitrogen monoxide gas and oxygen gas

NeTakaya

Answer:

For the formation of nitrogen dioxide, the reactants used are nitrogen monoxide and oxygen gas. 2 moles of nitrogen monoxide gas react with 1 mole of oxygen gas to produce 2 moles of nitrogen dioxide gas.

Explanation:

3 0

2 years ago