CHEMISTRY MIDDLE SCHOOL

How many days are in a solar year?

Answers

Answer 1
Answer: 365 days.

Solar years is what we go by.
Answer 2
Answer: the answer is 365.242

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Express 975,000 in scientific notation
Which of these experimental designs could lead to bias?A) Two mice are given the choice between Swiss and American cheese. B) Phil and Bart race down the street to determine who is the fastest. Eliminate C) A car company pays participants to test drive and evaluate their new auto. D) A private company uses a random taste test of three different, unidentified soft drinks.

Acid rain is produced when _______ mixes with the water of a raindrop.A. Carbon Dioxide
B. Nitrogen Dioxide
C. Sulfur Trioxide
D. All of the Above
E. None of the Above

Answers

The answer should be  B - Nitrogen Dioxide.

Can someone please help me?

Answers

the higher the pressure of the gas, the higher gas can dissolve in a solvent


higher pressure, less gas

I think

A pressure of 655 mm hg is equal to how many atmospheres

Answers

Answer:

0.861842

Explanation:

One atm. equals 760.0 mm Hg, so there will be a multiplication or division based on the direction of the change. Example #1: Convert 0.875 atm to mmHg. Solution: multiply the atm value by 760.0 mmHg / atm.

Please check my answers? (image attached)

Answers

the first two answers are correct, but the last one is supposed to be 'molecule' not covalent bond 

How many sig figs does the number 0.000203 have?

Answers

Answer:

This number has 3 significant figures.

Explanation:

What is the balanced chemical equation for the reaction between Hydrochloride acid and calcium carbonate when the products of the reaction are calcium chloride Carbon Dioxide and water

Answers

Answer: 2HCl + CaCO3 => CaCl2+ CO2 + H2O

Explanation:

The equation is now balanced.

2 atoms H in both reactant and product side.

Cl have 2 atoms on both sides.

Ca have 1 atom in both sides.

C have 1 atom on both sides and

O have 3 atoms on both reactant and product side
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