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aleksley [76]
3 years ago
9

Tracy and Eric are timing how fast marbles roll down an inclined plane . They plan to do this 5 times , and then take the averag

e time for their results . What would be the BEST way to improve the accuracy of their data?
Chemistry
1 answer:
Sergio039 [100]3 years ago
3 0

Answer:

The accuracy can be improved by making sure no external force is applied, i.e the marbles should accelerate under gravity only during each trial.

Explanation:

Accuracy is a term used to describe the relationship between a measured value to the real value. When a measured value is accurate, it implies that there is little or no error in the value; thus it is equal to the real value or very close to it.

Since this experiment is to determine the speed with which the marble roll down the plane, they should ensure uniform acceleration through out the  trials. The marbles should be allowed to move under the influence of gravity only without applying any external force.

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Calculate the grams of CaCl2 necessary to make a 0.15M solution.
NNADVOKAT [17]

Answer:

Gram molecular mass = 40 + (35.5)2 = 111g

Mass of CaCl_2 in 1 mole = 111g

Mass of CaCl_2 in 0.15 mole = 111 × 0.15 = 16.65 g

8 0
3 years ago
According to the molecular orbital energy-level diagram below, which one of the following statements is not correct about NO, NO
Lubov Fominskaja [6]

None of the statement is not correct about NO, NO+, and NO−.

Explanation:

Those molecules whose all subshells are completely filled are diamagnetic.

Those molecules whose any sub-shell is incomplete is termed paramagnetic.

Let us check the magnetism in all three molecules based on molecular orbital theory and Lewis structure

NO= number of electrons 11

It form N=O having configuration 1s2,2s2,2p6,3s1, it has 1 unpaired electron so it is paramagnetic.

Now NO-, number of electrons 12 having configuration 1s2,2s2,2p6,3s2, no unpaired electron hence dimagnetic.

Now NO+, number of electrons is 10 having configuration 1s2,2s2,2p6,3s2, dimagnetic

Let us calculate the bond order of NO-

N0- have 12 electrons as 5 of nitrogen, 6 of oxygen and 1 of - charge on oxygen.

So, bond order = \frac{8-4}{2}

                          = 2 double bonds

bond order of NO+, Number of electrons is 10

bond order= \frac{8-2}{2}

bond order = 3

bond order of NO, number of electrons 11

bond order= \frac{8-3}{2}

bond order=2.5

Larger the bond order shorter the bond.

4 0
3 years ago
Calculate the molarity of 6.631 g NANO3 in 100.0 mL of solution<br><br><br>add stepss
riadik2000 [5.3K]

Answer:

0.7802 M

Explanation:

<u>Data:</u>

  • V (volume) = 100.0 mL → V = 0.1000 L
  • m (mass) = 6.631 g → n = 0.07802 mol

<u>Wanted: </u>

  • M (Molarity)

<u>Equation: </u>

M = \frac{mol}{L}

<u>Solution:</u>

1. Convert mL to L:

  • V = 100.0 mL x \frac{1 L}{1000 mL} = 0.1000 L

2. Convert g to mol:

  • n = \frac{6.631 g}{84.9947 g/mol} = 0.07802 mol

3. Molarity Equation:

  • M = \frac{0.07802 mol}{0.1000 L} = 0.7802 M
3 0
2 years ago
Read 2 more answers
HELP HELP IM FAILING PLZ HELP ME
RoseWind [281]

Answer:

236 g/mol

Explanation:

This question is asking to calculate the molar mass/formula mass of calcium nitrate tetrahydrate with the chemical formula: Ca(NO3)2 · 4H20. This is done as follows:

Atomic mass of the constituent elements are as follows:

Ca = 40

N = 14

O = 16

H = 1

Hence, in Ca(NO3)2 · 4H20.

= 40 + {14 + 16(3)}2 + 4 {1(2) + 16}

= 40 + {14 + 48}2 + 4{2 + 16}

= 40 + {62}2 + 4{18}

= 40 + 124 + 72

= 236

Hence, the molar mass of Ca(NO3)2 · 4H20 is 236g/mol.

6 0
2 years ago
Read 2 more answers
When a deer eats too much in a given area, we call this _________.
Sophie [7]

Answer:

Over-browsing

6 0
3 years ago
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