The amount of silica in the magma and temperature are factors that determine the viscosity of magma.

Answers

Answer 1

Answer: The viscosity of magma increases as the silica content increases from basalt to rhyolite.

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A student had two dilute, colorless solutions, HCl(aq) and NaOH(aq), which were at the same temperature. The student combined the solutions, and the reaction represented above occurred. Which of the following results would be evidence that a chemical reaction took place
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Which characteristics of metal atoms help explain why valence electrons in a metal are delocalized?

Answers

In a metal, the electrons are considered free because there are more electrons than there should be and also transition metals are willing to accept and give up electrons from their d-orbitals. The d-orbital shell are in a relatively high energy state which means they are loosely bound to the atom where they can freely move around.

A sample contains 10.5 g of the radioisotope Pb-212 and 157.5 g of its daughter isotope, Bi-212. How many half-lives have passed since the sample originally formed?4
14
15
147.5

Answers

Answer: The sample must have passed 4 half-lives after the sample was originally formed.

Explanation: This is a type of radioactive decay and all the radioactive process follow first order kinetics.

Equation for the reaction of decay of $_(82)^(212)\textrm{Pb}$ radioisotope follows:

$_(82)^(212)\textrm{Pb}\rightarrow _(83)^(212)\textrm{Bi}+_(-1)^0\beta$

To calculate the initial amount of $_(82)^(212)\textrm{Pb}$ , we will require the stoichiometry of the reaction and the moles of the reactant and product.

Expression for calculating the moles is given by:

$\text{no of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Moles of $_(82)^(212)\textrm{Pb}$ left = $(10.5g)/(212g/mol)=0.0495moles$

Moles of $_(83)^(212)\textrm{Bi}=(157.5g)/(212g/mol)=0.7429moles$

By the stoichiometry of above reaction,

1 mole of $_(83)^(212)\textrm{Bi}$ is produced by 1 mole $_(82)^(212)\textrm{Pb}$

So, 0.7429 moles of $_(83)^(212)\textrm{Bi}$ will be produced by = $(1)/(1)* 0.7429=0.7429\text{ moles of }_(82)^(212)\textrm{Pb}$

Amount of $_(82)^(212)\textrm{Pb}$ decomposed will be = 0.7429 moles

Initial amount of $_(82)^(212)\textrm{Pb}$ will be = Amount decomposed + Amount left = (0.0495 + 0.7429)moles = 0.7924 moles

Now, to calculate the number of half lives, we use the formula:

$a=(a_o)/(2^n)$

where,

a = amount of reactant left after n-half lives = 0.0495 moles

$a_o$ = Initial amount of the reactant = 0.7924 moles

n = number of half lives

Putting values in above equation, we get:

$0.0495=(0.7924)/(2^n)$

$2^n=16.0080$

Taking log on both sides, we get

$n\log2=\log(16.0080)\nn=4$

Answer:

Explanation:

Edg 2020

What was the minimum temperature to the nearest degree for the thermometer shown here? / a. +16ºC b. +4ºC c. -13ºC d. -6ºC

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A figure of the thermometer for this problem is not given so I cannot really give a specific answer. Maybe this would help. The minimum temperature would be the lowest reading possible in the thermometer. Most probably it is option C or D. Hope this helps.

Answer:

How many milliters of a 0.171 solution contains 1.00 g of NaCl

Answers

: Molar mass of NaCl: 35.4+22.9 = 58.3 g/mol

X milliliters (=X/1000 liters) of a 0.171M solution contain 0.171*X/1000 moles of NaCl.
0.171*X/1000 moles of NaCl = 58.3*0.171*X/1000 g = 1 g (as given)
58.3*0.171*X/1000 = 1
X = 100.3

Explain by referring to the atomic structure of carbon. Compare between carbon fiber and iron (Fe) in terms of durability and performance.

Answers

Carbon is a chemicalelement with a chemical symbol "C". It has an atomic number of 6. That means a carbon atom has 6 protons, 6 neutrons, and 6electrons. Since carbon is in the second row (or second period), it has 2 electron orbits. Use the clay to make your protons and neutrons in the nucleus.

However, some factors do influence its durability, like its matrix. Furthermore, the intense use of composites and environmental factors could affect its durability and potential applications.

Difference between carbon fiber and iron

Carbonfiber is five-times stronger than iron( FE ) and twice as stiff. Though carbon fiber is stronger and stiffer than Iron (Fe) it is lighter than steel; making it the ideal manufacturing material for many parts. These are just a few reasons why carbon fiber is favored by engineers and designers for manufacturing.

Steel with more carbon is harder and stronger than pure iron, but it also breaks more easily (brittle).

Answers

The atoms always have an equal amount of protons and neutrons so lets say if one had 10 positive then it would have 10 negatives making it neutral.
10-10=0

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