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natulia [17]
3 years ago
14

I Need help ASAP!

Chemistry
2 answers:
evablogger [386]3 years ago
6 0

Answer:

It's A

Explanation:

Got it right on the test :)

8090 [49]3 years ago
4 0

Answer:

The correct answers are:

• Softer, porous, or more permeable rocks weather faster than harder rocks.

• Rocks in warmer climates weather faster than rocks in colder climates.

• The more water present, the faster the rate of weathering.

Explanation:

Weathering is the process through which the surface minerals of rock are broken down and loosened. This occurs through the action of extreme temperatures, rainwater and biological activity.

Hope this helps- Good luck ^w

You might be interested in
Number of grams of perchloric acid in 4.25 x 10^-4 mol of perchloric acid
weeeeeb [17]

Answer: 0.043g

Explanation:

chemical formular of perchloric acid is HClO4

no. of moles = mass / molar mass

n = m / mm

m = n x mm

n = 4.25 x 10^-4 mol

m = ?

mm = 1 + 35.5 + (16 x 4) = 100.5g/mol

m = 4.25 x 10^-4 mol x 100.5g/mol

m = 0.043g

7 0
3 years ago
The specific heat capacity of silver is 0.24 J/°C ·g.
kirza4 [7]

Answer:

A) 900 J

B) 27.96 J

C) 1,628 J ≅ 1.63 kJ

Explanation:

The heat absorbed by the metal (silver) - or energy required to heat it -  is calculated as:

heat = mass x Cp x ΔT

Where Cp is the heat capacity (0.24 J/°C ·g) and ΔT is the change in temperature (final T - initial T).

A) Given:

mass = 150.0 g

final T = 298 K = 25°C

initial T = 273 K = 0°C

We calculate the energy in J to raise the temperature:

heat = mass x Cp x (final T - initial T)

       = 150 .0 g x 0.24 J/°C ·g x (25°C - 0°C )

       = 900 J

B) Given:

moles Ag= 1.0 mol

ΔT = 1.08°C

We first calculate the mass of silver (Ag) by multiplying the moles of Ag by the molar mass of Ag (MM = 107.9 g/mol)

mass = moles x MM = 1.0 mol Ag x 107.9 g/mol Ag = 107.9 g

Then, we calculate the heat required:

heat = mass x Cp x ΔT = 107.9 g x 0.24 J/°C ·g x 1.08°C = 27.96 J

C) Given:

heat = 1.25 kJ = 1,250 J

final T = 15.28°C

initial T = 12.08°C

We first calculate the change in temperature:

ΔT = final T - initial T = 15.28°C - 12.08°C = 3.2°C

Then, we calculate the mass of silver:

mass = heat/(Cp x ΔT) = 1,250 J/(0.24 J/°C ·g x 3.2°C) = 1,628 J ≅ 1.63 kJ

6 0
3 years ago
Which of these is an empirical formula?
iVinArrow [24]

Answer: C

Explanation:

7 0
3 years ago
What is 30-9x2*2-21-4+4
IgorC [24]
Answer:
9 (1-2x²)

Explanation:
The given expression is:
30 - 9x²*2 - 21 - 4 + 4
The first step is to compute the multiplication. This will give:
30 - 18x² - 21 - 4 + 4
Then, we will add like terms as follows:
(30-21-4+4) - 18x²
= 9 - 18x²
Finally, we can take the 9 as a common factor from both terms, this will give:
9 (1-2x²)

Hope this helps :)

5 0
4 years ago
Properties Shared by Metalloids and Nonmetals
Anna35 [415]
They both conduct electricity at least partially
7 0
3 years ago
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