Optimist or Pessimist? Read each statement. Circle the number that reflects how well the statement
describes you.
No way! That’s me!
1. Things usually turn out for the best for me. 1 2 3 4
2. It’s easy for me to relax. 1 2 3 4
3. If something can go wrong, it will! 1 2 3 4
4. My future’s so bright, I’ve got to wear shades. 1 2 3 4
5. I enjoy my friends a lot. 1 2 3 4
6. I always keep busy. 1 2 3 4
7. I hardly ever count on things going my way. 1 2 3 4
8. It doesn’t take much to get me angry. 1 2 3 4
9. I do not get my hopes up. 1 2 3 4
10. When all is said and done, I expect more good things
to happen to me than bad things to happen. 1 2 3 4
How to Score the Survey
• Cross out questions 2, 5, 6, and 8. They are fillers.
• Add up the answers to questions 1, 4, and 10. This is your O score. O =
• Add up the answers to questions 3, 7, and 9. This is your P score. P =
• Subtract your P score from your O score. (The answer may be a negative
number.) Then circle your answer on the number line below: Which statement indicates what the fossil record suggests about evolution on Earth?

True is ur answer : )

27. =3,500,000 x 4,000 = 14,000,000,000

Note that 2 mol dm⁻³ = 2 mol/(dm³)outline: we're given the concentration of hcl, which is  2 mol dm⁻³ (cubic meters in the denominator can represent volume, so i know this is concentration). we're an amount of calcium carbonate caco₃, which is 5 g. we're presented with a chemical equation which includes caco₃ and hcl. we are told to find the volume of hcl. from what we see so far, this seems to be a stoichiometry  problem. we'll have to use the given information about calcium carbonate to find the amount of moles of hcl needed to fully react with calcium carbonate. then we'll have information about the moles of hcl and the concentration of hcl; that will be enough to figure out volume according to the formula concentration = moles / volume.======all the answer choices are not in dm.convert the given concentration so that it uses cm⁻³.we can use conversion factors. we have to cube our conversion factors so that dimensional analysis works.we can convert to meters first, using the fact that     10 dm = 1 m  ⇔ 10³ dm³ = 1 m³then we use the fact that     10² cm = 1 m ⇔ (10² cm)³ = (1 m)³ ⇔ 10⁶ cm³ = 1 m³so converting:     now we have to find the moles of hydrochloric  acid neededfind the moles of calcium carbonate. we have to find the molar mass of calcium carbonate, caco₃, which can be found by    molar mass = (mass ca) + (mass c) + 3(mass o)    = 40 + 12 + 3(16)    = 100 g/molconvert the given 5 g to moles:     mol caco₃ = 5 g caco₃ * 1 mol/(100 g) = 0.05 mol caco₃use stoichiometry (ratios) to figure out the moles of hcl needed. ratio wise, there's 2 hcls for every caco₃, so use dimensional analysis    mol hcl = mol caco₃ * (2 mol hcl) / (1 mol caco₃)    = 0.05 mol hcl * 2    = 0.1 mol hcl  we have 0.1 mol hcl and concentration of hcl (0.002 mol/cm³).we need to find volumesince concentration = moles / volume, rearrange to get     volume = moles / concentration    volume = 0.1 mol / (0.002 mol/cm³)    volume = 50 cm³