# Caitlin

Most popular questions and responses by Caitlin
1. ## math

Eight more than the product of two and a number x xxx.

2. ## Chemistry

You have to prepare a pH 3.50 buffer, and you have the following 0.10M solutions available HCOOH, CH3COOH, H3PO4,CHOONa, CH3COONa, and NaH2PO4. a) What solutions would you use? b) How many milliliters of each solution would you use to make approximately 1

3. ## Chemistry

A solution contains 2.2×10−4 M Ag+ and 1.3×10−3 M If NaI is added, will AgI(Ksp=8.3×10−17) or PbI2(Ksp=7.9×10−9) precipitate first? I know the answer to this is AgI Specify the concentration of I− needed to begin precipitation.

4. ## Chemistry

Which of the subshells in the electron configuration of Hf behave as core orbitals Check all that apply 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d

5. ## Chemistry

What do we call the part of the universe that is not part of the system

6. ## Chemistry

A line in the Balmer series of hydrogen has a wavelength of 486 nm. From what state did the electron originate? In what region of the electromagnetic spectrum is this line observed?

7. ## Math

Check my answers please? There are only 10 The figure below shows a triangle with vertices A and B on a circle and vertex C outside it. Side AC is tangent to the circle. Side BC is a secant intersecting the circle at point X: The figure shows a circle with

8. ## Pre-Calculus

A rectangular window is topped with a semicircle. The height of the rectangular part is 1 more than 3 times its width, w meters. Which function represents the total area, A, of the window in terms of the width?

9. ## Chemistry

Rank the carbon-carbon bonds in order of decreasing bond length. Rank carbon-carbon bonds from highest bond length to lowest. To rank bonds as equivalent, overlap them. 1,2,3

10. ## Chemistry

What is the frequency of radiation that has a wavelength of 13 \mu m, about the size of a bacterium?

11. ## Physics

a)What frequency is received by a person watching an oncoming ambulance moving at 120 km/h and emitting a steady 700 Hz sound from its siren? The speed of sound on this day is 345 m/s. b)What frequency does she receive after the ambulance has passed?

12. ## Chemistry

Formic acid, HCO2H, is a weak acid. Write a net ionic equation for the reaction of formic acid and aqueous potassium hydroxide.

13. ## Chemistry

A meteorological balloon had a radius of 1.1 m when released at sea level at 20◦C. It ex- panded to a radius of 5 m when it had risen to its maximum altitude, where the temperature was −20◦C. What was the pressure inside the balloon at that altitude?

14. ## Math

Find two mixed numbers so that the sum is 7 2/4 and the difference is 5

15. ## Chemistry

The dipole moment (mu) of HBr (a polar covalent molecule) is 0.851 D (debye), and its percent ionic character is 12.6 %. Estimate the bond length of the H-Br bond in picometers.

16. ## science

Water is useful for reducing friction between objects. However you also learned that (due to friction) moving water causes rough rocks to become smooth. How can this be?

17. ## chemistry

to clean a clogged drain, 26 g of sodium hydroxide is added to water to make 150 ml of solution what are the pH and pOH values for the solution?

18. ## Quantitative Math

A bacteria has a doubling period of 5 days. If there are 3250 bacteria present now, how many will there be in 40 days? I've found the growth rate to be 0.14869, but I can not find the amount of bacteria.

19. ## Chemistry

Calculate the heat (in kJ) required to change 40.0g of ice at -30.0 deg C to steam at 150.0 deg C?

20. ## Chemistry

If 0.370 g of Ca(OH)2 is added to 500 mL of water and the mixture is allowed to come to equilibrium, will the solution be saturated?

21. ## Chemistry

What is the kinetic energy of the emitted electrons when cesium is exposed to UV rays of frequency 1.7×10^{15} Hz?

22. ## Math

A rectangle's width is x and its length is 2x-1. Its area is 21. Find its dimensions. my work so far: 21 = x(2x +1) 21 = 2x^2 + x I was wondering how I would continue to solces this problem.

23. ## Chemistry

Oxygen can be produced in the laboratory by the reaction 2 KClO3(s) → 2 KCl(s) + 3 O2(g) . How much potassium chlorate is needed to produce 2.75 L of oxygen, collected over water at 37◦C and 94.9 kPa? The vapor pressure of water at 37◦C is 6.28 kPa.

24. ## chem really need help!

If a solution containing 33.82 g of mercury(II) acetate is allowed to react completely with a solution containing 9.718 g of sodium sulfate, how many grams of solid precipitate will be formed? How many grams of the reactant in excess will remain after the

25. ## Chemistry

How much heat in kJ is lost when 100.0g of steam at 200 deg C is cooled down until it forms ice at -30.0 deg C?

79. ## physics

how do I calculate mass of one object in an elastic collision? I have the equation m1v1 initial + m2v2 initial = m1v1 final + m2v2 final How do I rearrange this to solve for m2?

80. ## Calculus

well i have this homework question that says: A rock is dropped from the top of a 300-ft cliff. It's velocity at time t seconds is v(t0= -32 t feet per second. a.) Find the height of the rock above the ground at time t. b.) How long will the rock take to

81. ## Chemistry

The heat lost or gained by a system is related to its temperature change by a property called its heat capacity. The molar heat capacity of metals at or above room temperature equals 24.92 J K-1mol-1. The temperature of a block of copper metal (molar mass

82. ## Calc

A closed box with a square base is to be constructed so that its volume is 324 cubed feet. The material for the top and bottom cost is $3 per square foot, and that for the sides$2 per square foot. Find the dimensions of the box so that the cost will be

83. ## Chemistry

What is the frequency of radiation that has a wavelength of 13 \mu m, about the size of a bacterium?

84. ## alegerba

In the expression 90+5z, the coefficient is

85. ## Physics

A particle's constant acceleration is north at 108 m/s2. At t = 0, its velocity vector is 61.7 m/s east. At what time will the magnitude of the velocity be 102 m/s?

86. ## Physics

A horizontal spring attached to a wall has a force constant of 780 N/m. A block of mass 1.70 kg is attached to the spring and oscillates freely on a horizontal, frictionless surface as in the figure below. The initial goal of this problem is to find the

87. ## Math

A ten-pin bowling ball has a volume of about 5274 cm3. A candlepin (8) bowling ball has a volume of about 48 in3. About how much greater is the volume of a ten-pin bowling ball than the volume of a candlepin bowling ball?

88. ## Chemistry

Use Equation 7.1 and assuming that core electrons contribute 1.00 and valence electrons contribute nothing to the screening constant, S, calculate Zeff} for these two ions. Express your answers as integers. Enter your answers numerically separated by a

89. ## American History

This is what my teacher wrote up on the board today and i was needing some help with it i don't really understand it all... This is exactly what he wrote: In a page-long essay describe how we got Texas Include: Stephen Austin, Zachary Taylor, Manifest

90. ## ela

Below the main level, we have a large playroom. What part of speech is below?

I don't know how to go about solving this problem: There were 93 students going to camp. After equal groups of fewer than 10 students were formed for hiking. 2 students were left over . How many equal groups were formed? Thanks!

92. ## math

what is 4/9 reduced???

93. ## Introduction programing visual basic

break even analysis. suppose a certain product sells for a dollars per unit. then the revenue from selling x units of the product is ax dollars if the cost of producting each unit of the product is b dollars and the company has overhead cost of c dollars

94. ## Physics

Calculate the force of gravitational attraction between two spheres of mass 10.1kg and 45.2 kg that are 38.5m apart.

95. ## Physics

Calculate the force of gravitational attraction between two spheres of mass 10.1kg and 45.2 kg that are 38.5m apart.

96. ## science

According to the principle of superposition, in a stack of undisturbed sedimentary rocks, the oldest rocks are _____. Gaps in rock layers are called ____. Which of the following is not a type of unconformity?

97. ## algebra

Which situation would most likely be represented by a negative correlation: hours of practice and your golf score, hours of practice and the number of baskets you make in basketball, or hours of practice and the cost of a computer? Hint: In golf, the lower

98. ## chemistry

300.0 g of ammonia react with 36.0 moles of sulfuric acid to produce ammonium sulfate. How many moles of excess sulfuric acid are left over after the reaction is complete?

99. ## Physics

A 66.0 kg base runner begins his slide into second base when moving at a speed of 4.4 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is