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3 years ago

Tooth enamel is chemically known as

Chemistry

1 answer:

Vladimir [108]3 years ago

7 0

Answer:

Hey!

Your answer is Calcium Phosphate!

Explanation:

It is the substance/mineral that is mostly found in our teeth and bones!

HOPE THIS HELPS!!

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____ help scientists understand processes in the natural world by providing simpler representations of those processes.

Marina CMI [18]

Answer:

Models help scientists understand processes in the natural world by providing simpler representations of those processes.

7 0

2 years ago

A sample of sand, 5cm in diameter and 10 cm long, was prepared at a porosity of 50% in a constant head apparatus. The total head

GarryVolchara [31]

Answer:

$K = 2.037*10^{-3} m/s$

$V_s = 0.0122 \ m/s$

Explanation:

Given that;

diameter (d) = 10cm/2 = 0.1m/2 = 0.05 m

length (l) = 10 cm = 0.1 m

porosity = 50%

height (h) = 30 cm = 0.3 m

time (t) = 5 s

volume (v) = 60 cm³ = 60 × 10⁻⁶ m³

Q (flow rate) = $\frac{v}{t}$

Q = $\frac{60*10^{-6} m^3}{5}$

Q = $12*10^{-6} m^3 /sec$

From constant head method, we use the relation K = $(\frac{Q*L}{A*h})$ to determine the hydraulic conductivity ; we have:

$K = \frac{12*10^{-6}*0.1}{\frac{\pi}{4}0.05^2*0.3}$

$K = 0.002037\\\\K = 2.037*10^{-3} m/s$

Seepage velocity $V_s = \frac{velocity }{porosity}$

where; velocity = $K*i$

= $(2.037*10^{-3}*)(\frac{0.3}{0.1})$

= $6.111*10^{-3} m/s$

$V_s = \frac{6.111*10^{-3}}{0.5}$

$V_s = 0.0122 \ m/s$

8 0

3 years ago

Write the balanced equation for the reaction of aqueous sodium carbonate and aqueous calcium chloride dihydrate to form solid ca

faltersainse [42]

Na2CO3 (aq) + CaCl2H4O2 (aq) = CaCO3 (s) + 2 NaCl (aq) + 2 H2O (l)

5 0

3 years ago

Read 2 more answers

What mass of calcium chloride is needed to prepare 2.657 L of a 1.56 M solution?

inna [77]

Answer:

459.126 grams of calcium chloride is needed to prepare 2.657 L of a 1.56 M solution

Explanation:

Molarity is a measure of the concentration of a solute in a solution that indicates the amount of moles of solute that appear dissolved in one liter of the mixture. In other words, molarity is the number of moles of solute that are dissolved in a given volume.

The Molarity of a solution is determined by the following expression:

$Molarity=\frac{number of moles of solute}{volume}$

Molarity is expressed in units $\frac{moles}{liter}$

In this case:

Molarity: 1.56 M= 1.56 $\frac{moles}{liter}$
Number of moles of calcium chlorine= ?
Volume= 2.657 liters

Replacing:

$1.56 M=\frac{Number of moles of calcium chlorine}{2.657 liters}$

Solving:

Number of moles of calcium chlorine= 1.56 M* 2.657 liters

Number of moles of calcium chlorine= 4.14 moles

In other side, you know:

Ca: 40 g/mole
Cl: 35.45 g/mole

Then the molar mass of the calcium chloride CaCl₂ is:

CaCl₂= 40 g/mole + 2* 35.45 g/mole= 110.9 g/mole

Now it is possible to apply the following rule of three: if in 1 mole there is 110.9 g of CaCl₂, in 4.14 moles of the compound how much mass is there?

$mass=\frac{4.14 moles*110.9g}{1 mole}$

mass= 459.126 g

459.126 grams of calcium chloride is needed to prepare 2.657 L of a 1.56 M solution

3 0

2 years ago

When biological samples of unknown origins are discovered at a crime scene, what should investigators do?a. assume no pathogens

adoni [48]

Answer: assume pathogens are present and treat the samples accordingly

Explanation:

When investigators are unable to conclusively ascertain the source of a biological sample found at a crime scene, the correct thing to do is to treat it as if pathogens are present in it and handle it according to set rules on how to handle pathogens.

This is done to ensure that if a pathogen is indeed present, it would not cause a health emergency by infecting those who come in contact with the samples at the scene.

3 0

2 years ago