CHEMISTRY HIGH SCHOOL

The type of bond between atoms in a molecule of CO2 (electronegativity difference = ~1)a. hydrogen bond
b. ionic bond
c. polar covalent bond
d. pure covalent bond
e. metallic bond

Answers

Answer 1
Answer: carbon dioxide, or CO_(2), is a pure covalent bond. 

pure - it's non-polar, because it's a linear & symmetrical bond.

covalent - covalence is when 2 electrons are shared by a pair of atoms. in the case of carbon dioxide, it's three atoms with  an oxygen atom on the right, an oxygen atom on the left, and a carbon atom smack in the middle. 2 of carbon's extra electrons are shared with the right oxygen, and 2 other extra atoms are shared with with left oxygen.

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How many grams of CaCl₂ should be dissolved in 500.0 mL of water to make a 0.20M solution of CaCl₂?

Answers

0.2M means 0.2mol CaCl2/1L solution.

This question didn't give us a density of the solution so needs an assumption that the solution has equal volume to water.

xmol/0.5L=0.2M
x = 0.1

0.1mol of CaCl2 is needed. Ca=40g/mol, Cl=35.5g/mol.
CaCl2 0.1mol = (40+35.5*2)*0.1=11.1g

At the end of 2012, global population was about 7.0 billion people. What mass of glucose in kg would be needed to provide 1200 cal/person/day of nourishment to the global population for one year? Assume that glucose is metabolized entirely to CO₂(g) and H₂O(l) according to the following thermo-chemical equation: C₆H₁₂O₆(s)+6O₂(g)⟶6CO₂(g)+6H₂O(l); ΔH₀ = −2803kJ

Answers

Final answer:

To calculate the mass of glucose needed to provide nourishment to the global population for one year, multiply the daily energy requirement by the total number of days and the global population. Convert the energy to mass using the thermo-chemical equation.

Explanation:

To calculate the mass of glucose needed to provide 1200 cal/person/day of nourishment to the global population for one year, we need to determine the total energy required for one year and then convert it to mass using the thermo-chemical equation. First, calculate the total energy required by multiplying 1200 cal/person/day by the total number of days in a year and the global population. Next, convert the energy to kilojoules. Finally, use the energy change given in the thermo-chemical equation to convert the energy to mass of glucose.

  1. Calculate the total energy required: 1200 cal/person/day x 365 days/year x 7.0 billion people.
  2. Convert energy to kilojoules: Total energy in cal x 4.184 J/cal x 10^-3 kJ/J.
  3. Convert energy to mass of glucose: Energy in kJ / energy change in kJ (ΔH₀) in the thermo-chemical equation.

The final result will give you the mass of glucose needed in kilograms.

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If the hydrogen ion concentration is 10-7M, what is the pH of the solution?Show all work.

Answers

Remember pH=-log(H ions). So it would be pH=-log(10^-7).

Matt's cube, after 5 trials, had an average density of 7.40 g/cm3 . His group's cube was made ofA) aluminum.
B) gold.
C) nickel.
D) zinc.

Answers

The right answer for the question that is being asked and shown above is that: "B) gold." Matt's cube, after 5 trials, had an average density of 7.40 g/cm3 . His group's cube was made of B) gold. 

its d zinc if your using usa test this dummy got me wrong trust me sis the answer is d

What does newton's third law say about why momentum is conserved in collisions?A. Equal forces act in equal times, so the change in momentum for both objects must be equal.
B. Unequal forces act in unequal times, so the change in momentum for both objects must be equal.
C. Unequal forces act in unequal times, so the change in momentum for both objects must be unequal.
D. Equal forces act in unequal times, so the change in momentum for both objects must be equal.

Answers

Answer: Option (A) is the correct answer.

Explanation:

According to Newton's third law of motion, when force is exerted by one body to second body then the  second body will also exert a force equal in magnitude and opposite in direction on the first body.

For example, when we hit a wall with our leg then the wall also applies a force on our leg and thus, our leg gets hurt.

Hence, we can conclude that newton's third law says that momentum is conserved in collisions because equal forces act in equal times, so the change in momentum for both objects must be equal.
I took the test and can confirm that the answer is A.

Plz I need help is the 2nd time I post this

Answers

Answer:

2--->C

6---->E

3---->D

4--->A

5--->B

1---->F

Explanation:

I think so, sorry if its wrong.

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