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3 years ago

I need help !!!!!!!!!!! Plz

Chemistry

1 answer:

pishuonlain [190]3 years ago

5 0

Answer: 1: B. It will speed up the reaction.

2: A. Increase the concentration of a reactant.

3: A. They act as catalysts.

4: C. A catalyst decreases the activation energy needed for a reaction.

5: D. collision theory.

Explanation: I just took the quiz:)

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Mass divided by volume *

lorasvet [3.4K]

D — density

hope this helps !

5 0

2 years ago

0.750mol of gas are stored in a tank at a pressure of 275kpa and a temperature of 0.00 degrees * C What is the volume of the tan

nordsb [41]

Answer:

The volume on the tank is 6, 20 L

Explanation:

We use the formula PV=nRT. We convert the units of pressure in kPa into atm and temperature in Celsius into Kelvin:

0°C=273K

101,325kPa---1 atm

275kPa --------x=(275kPax 1 atm)/101,325kPa= 2,71 atm

PV=nRT --> V=nRT/P

V= 0,750 mol x 0,082 l atm /K mol x 273 K/ 2, 71 atm= 6, 20 L

4 0

2 years ago

Alcohol begins to affect your brain _______

zvonat [6]

Alcohol begins to affect your brain cells

4 0

2 years ago

Density is the amount of mass per unit volume. Calculate the density of an object that has a mass of 10 Kg and has a volume of 5

Gnoma [55]

Answer: 2 kg/L or 2 g/mL

Explanation:

litres are a cubic measure. “Cubic litres” is redundant at best, potentially confusing.

4 0

2 years ago

How many moles are in 2.8x10^24 atoms of silicon?

sergejj [24]

Answer:

4.6 mol Si

General Formulas and Concepts:

Atomic Structure

Reading a Periodic Table
Moles
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Stoichiometry

Using Dimensional Analysis

Explanation:

Step 1: Define

[Given] 2.8 × 10²⁴ atoms Si

[Solve] moles Si

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

[DA] Set up: $\displaystyle 2.8 \cdot 10^{24} \ atoms \ Si(\frac{1 \ mol \ Si}{6.022 \cdot 10^{23} \ atoms \ Si})$
[DA] Divide [Cancel like units]: $\displaystyle 4.64962 \ mol \ Si$

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

4.64962 mol Si ≈ 4.6 mol Si

6 0

2 years ago