7h

#### Classify the following chemical reactions as endothermic or exothermic.

PCl3 (s) + Cl2 (g) → PCl5 (s) + energy2KNO3 (s) + energy → 2KNO2 (s) + O2 (g) NH4NO2 + energy → N2 (g) + 2H2O (g)2H2 (g) + O2 (g) → 2H2O (l) + energya.exothermic b.endothermic

8h

#### calculating final speed with constant acceleration

what equation can be used to solve this problem?a bicyclist at rest begins pedaling and gaining speed steadily for 5.7 seconds during which she covers 33m. what is her final speed?

#### Limiting STOICH - Please show work, chem is hard.

What mass of Aluminum oxide is formed when 13.0g of Aluminum is burned in 21.0g of Oxygen gas? ?

9h

#### Bacteria Rate question

During a research experiment, it was found that the number of bacteria in a culture grew at a rate proportional to its size. At 9:00 AM there were 3,000 bacteria present in the culture. At noon,...
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10h

#### Mass-Mass Relationships.

-If sulfuric acid (H2SO4) reacts with 29 grams of sodium chloride (NaCl), how many grams of hydrochloric acid (HCl) are produced? H2SO4 + NaCl ----> HCl + Na2SO4-In the same reaction, how much...
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10h

#### Investment Bank Question

Marsha and Jan both invested money on March 1, 2007. Marsha invested $8,000 at Bank A where the interest was compounded quarterly. Jan invested $5,000 at Bank B where the interest was compounded...
more

#### Find the 17th term of the arithmetic progression with first term 5 and common difference 2.

Find the 17th term of the arithmetic progression with first term 5 and common difference 2.

11h

#### A bacteria culture initially contains 200 cells and grows at a rate proportional to its size. After 5 hours the population has increased to 220.

(a) Find an expression for the number of bacteria after t hours. P(t)= (b) Find the number of bacteria after 9 hours. (c) Find the rate of growth after 9 hours. (d) When will the population...
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11h

#### A roast turkey is taken from an oven when its temperature has reached 195 Fahrenheit and is placed on a table in a room where the temperature is 65 Fahrenheit.

(a) If the temperature of the turkey is 150 Fahrenheit after half an hour, what is its temperature after 45 minutes? _______ Fahrenheit.(b) When will the turkey have cooled to 110...
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11h

#### Chem 101 ideal gas

A hot air balloon is filled with 1.43 x106 of an ideal gas on a cool morning ( 11C)The air is heated to 131C What is the volume of the air in the balloon after it is heated? Assume that none of...
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12h

#### What is the acceleration (in m/s^2) of gravity on the surface of the moon?

There are two parts to this problem:a). What is the acceleration (in m/s^2) of gravity on the surface of the moon? (I am not given mass or the radius)b). What is the acceleration (again in m/2^s)...
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12h

#### systems of equations & inequalities

your family goes to a southern-style restaurant for dinner. there are 6 people in your family. some order the chicken dinner for$14 and some order the steak dinner for $17. if the total bill was...
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12h

#### Are my answers to these Chemistry questions on Le Chatelier correct?

Le Chatelier’s principle states which of the following?A. When a stress is applied to an equilibrium, the reaction will shift in a way that relieves the stress and restores the equilibrium.B. When...
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13h

#### The equation for free fall at the surface of Planet X is s = 4.31t2 with t in seconds. Assume a rock is dropped from the top of a 600m cliff. Find the speed of the rock at t = 3 sec

The equation for free fall at the surface of Planet X is s = 4.31t2 with t in seconds. Assume a rock is dropped from the top of a 600m cliff. Find the speed of the rock at t = 3 secMULTIPLE...
more

#### Are my answers to these Spanish questions correct?

Expressions with DAR:Directions: Write on the line an expression with DAR from the choices given. da un paseo dan de comer a da a dan la mano damos las gracias a1. La...
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13h

#### Titration question

An 0.0151 L acidic solution of potassium dichromate is titrated with a solution of 0.125 mol/L iron (II) chloride. The concentration of potassium dichromate according to the experimental evidence...
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13h

#### Titration Question

A 30 mL sample of 0.45 mol/L bleach solution, NaOCl, is reacted with an excess of KI solution according to the following reaction equation: 2H+ + OCl- + 2I- → Cl- + H2O + I2 The I2 produced is...
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13h

#### Quadratic Relationship

If the vertex of a quadratic functions is on the x-axis, what must be true about the number of x-intercepts? How do you know?

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