You and a partner are asked to complete a lab entitled "Oxides of Ruthenium" that is sched uled to extend over two lab periods. The first lab, which is to be completed by your partner, is devoted to carrying out composition al an alysis. In the second lab, you are to determine melting points. Upon going to lab you find two unlabeled vials, one containing a soft yellow substance and the other a black powder. You also find the following notes in your partner's notebook Compound 1: 76.0% Ru and 24.0% O (by mass), Compound 2 : 61.2% Ru and 38.8% O (by mass) What is the identity of the black compound?

You and a partner are asked to complete a lab entitled "Oxides of Ruthenium" that is sched uled to extend over two lab periods. The first lab, which is to be completed by your partner, is devoted to carrying out composition al an alysis. In the second lab, you are to determine melting points. Upon going to lab you find two unlabeled vials, one containing a soft yellow substance and the other a black powder. You also find the following notes in your partner's notebook Compound 1: 76.0% Ru and 24.0% O (by mass), Compound 2 : 61.2% Ru and 38.8% O (by mass) What is the identity of the yellow compound?

A slotted lab mass typically has a wedge removed from it (the "slot"). How does the "missing" slot affect the mass printed on the slotted lab mass?

You and a partner are asked to complete a lab entitled "Oxides of Ruthenium" that is sched uled to extend over two lab periods. The first lab, which is to be completed by your partner, is devoted to carrying out composition al an alysis. In the second lab, you are to determine melting points. Upon going to lab you find two unlabeled vials, one containing a soft yellow substance and the other a black powder. You also find the following notes in your partner's notebook Compound 1: 76.0% Ru and 24.0% O (by mass), Compound 2 : 61.2% Ru and 38.8% O (by mass) Which compound is ionic?

What is the quotient if the dividend is

$$\frac { 1 } { 2 }$$

and the divisor is

$$\frac { 1 } { 8 }$$

?

Last week, you collected 20 pounds of cans for recycling. This week, you collect 25 pounds of cans for recycling. What is the percent of increase? A. 20% B. 25% C. 80% D. 125%

Draw the Lewis structure for $HCSNH_2$ (The carbon and nitrogen atoms are bonded together, and the sulfur atom is bonded to the carbon atom.) Label each bond in the molecule as polar or nonpolar.

Perform the indicated operation.

$$\left( 1 - 2 x - x ^ { 2 } + 4 x ^ { 3 } \right) + \left( x ^ { 3 } - 5 x ^ { 2 } + x + 8 \right)$$

The azide ion, $N_3 ^-$, is a symmetrical ion, all of whose contributing resonance structures have formal charges. Draw three important contributing structures for this ion.

Draw a picture and label it. Set up an equation and solve it. Show all your work. Round the measure of each angle to the nearest tenth of a degree. Round the length of a side to the nearest tenth of a unit. Assume the ground is level unless indicated otherwise. A lighthouse built at sea level is 169 ft tall. From its top, the angle of depression to a boat below measures

$$25.1 ^ { \circ }$$

. Find the distance from the boat to the foot of the lighthouse.

Write an equation for each translation of the graph of $y=|x|.$ vertex (5,2)

Which conic section is represented by each equation?

$$16x^2+25y^2-64=0$$

Factor completely. If the polynomial is not factorable, write prime.

$$8c^3-125d^3$$

Calculate the formal charge on the indicated atom in each of the following molecules or ions: chlorine in

$$HClO_4$$

(hydrogen is bonded to O).