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3 years ago

HELP URGENT PLS!1!! In what direction and how many spaces must you move the decimal point to make the following conversion?

Chemistry

1 answer:

Mama L [17]3 years ago

6 0

To convert from L to ml, we move three spaces to the right and the decimal place moves three places.

Our task here is to convert 600 L to mL. we have to remember that to convert from L to ml, we have to multiply the value in L by 1000

In other words, the value 1000 is known as the conversion factor.

When we do this, we move the decimal place three places to the right to have 600000.00mL

For more about conversion factors, see:

brainly.com/question/8512113

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The half-life of bismuth-210, 210bi, is 5 days. (a) if a sample has a mass of 160 mg, find the amount remaining after 15 days. M

adelina 88 [10]

solution:

The general form of the equation would be A = P x (1/2) ^ (t/h) where A = final amount, P = start amount, t = time (here in days) and h = half-life (has to be same units as t)

a) A = 192 x (1/2) ^ (15/5) = 192 x (1/2) ^3 = 192 x 1/8 = 24 mg

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4 years ago

Which process describes the melting of ice cream?

Sholpan [36]

Answer:

As the ice cream melts, heat transfers from the warm air surrounding the product into the ice cream to melt the ice crystals. Initially the ice melts at the exterior of the ice cream and there is a local cooling effect (in the vicinity of the melting ice).

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3 years ago

How many milliliters of water at 23 °C with a density of 1.00 g/mL must be mixed with 180 mL (about 6 oz) of coffee at 95 °C so

Svetach [21]

Answer:

V H2O = 170.270 mL

Explanation:

QH2O ( heat gained) = Qcoffe ( heat ceded)

⇒ Q = mCΔT

∴ m: mass (g)

∴ C: specific heat

assuming:

δ H2O = δ Coffe = 1.00 g/mL
C H2O = C coffe = 4.186 J/°C.g....from literature

⇒ Q coffe = (mcoffe)(C coffe)(60 - 95)

∴ m coffe = (180mL)(1.00 g/mL) = 180 g coffe

⇒ Q = (180g)(4.186 J/°C.g)(-35°C) = - 26371.8 J

⇒ Q H2O = 26371.8 J = (m)(4.186 J/°C.g)(60 - 23)

⇒ (26371.8 J)/(154.882 J/g) = m H2O

⇒ m H2O = 170.270 g

⇒ V H2O = (170.270 g)(mL/1.00g) = 170.270 mL

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3 years ago

Which element has chemical properties that are most similar to potassium?

Leni [432]

Answer:

nitrogen is the answer because of the same position of group in periodic table

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3 years ago

How many moles of MgCl2 will be produced from 65.0g of Mg(OH)2 , assuming HCl is available in excess

Butoxors [25]

Answer:

1.12 moles of MgCl₂

Explanation:

Given parameters:

Mass of Mg(OH)₂ = 65g

Unknown:

Number of moles of MgCl₂ = ?

Solution:

To solve this problem, obtain a balanced reaction equation first;

Mg(OH)₂ + 2HCl → MgCl₂ + 2H₂O

From the reaction above, this is a typical neutralization process in which an acid reacts with a base to produce salt and water only.

Let's proceed; the reactant in excess is the HCl, acid. The other reactant is the Mg(OH)₂ and it must be the limiting reactant. A limiting reactant is one that is given in short supply and determines the extent of the reaction.

Find the number of moles of Mg(OH)₂;

Number of moles = $\frac{mass}{molar mass} \\$

Molar mass of Mg(OH)₂ = 24 + 2(16 + 1) = 58g/mol

Number of moles = $\frac{65}{58}$ = 1.12moles

The balanced reaction equation shows that;

1 mole of Mg(OH)₂ gives 1 mole of MgCl₂

1.12 mole of Mg(OH)₂ will produce 1.12 moles of MgCl₂

6 0

3 years ago