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3 years ago

Please help! its due at the end of class.

Chemistry

1 answer:

Vera_Pavlovna [14]3 years ago

5 0

Answer:

2.down is hypotheses and 23.across is experiment

Explanation:

akechis pancakes

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Does the energy go from the surrounding to the chemicals or from the chemicals to the surround in an exothermic reaction?

Karo-lina-s [1.5K]

In general terms, exothermic reactions release energy, so the energy goes from the system to the surroundings.

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3 years ago

Given that sodium chloride is 39.0% sodium by mass, how many grams of sodium chloride are needed to have 100.mg of Na present? G

seraphim [82]

Answer: The mass of sodium chloride solution present is 0.256 grams.

Explanation:

We are given:

39.0 % of sodium in sodium chloride solution

This means that 39.0 grams of sodium is present in 100 grams of sodium chloride solution

Mass of sodium given = 100 mg = 0.1 g (Conversion factor: 1 g = 1000 mg)

Applying unitary method:

If 39 grams of sodium metal is present in 100 grams of sodium chloride solution

So, if 0.1 grams of sodium metal will be present in = $\frac{100}{39}\times 0.1=0.256g$ of sodium chloride solution.

Hence, the mass of sodium chloride solution present is 0.256 grams.

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3 years ago

A car moves at a speed of 50 kilometers/hour. Its kinetic energy is 400 joules. If the same car moves at a speed of 100 kilomete

DaniilM [7]

800 joules because it's twice the amount

7 0

3 years ago

Read 2 more answers

How were atomic models developed when no one had seen an atom?

AnnyKZ [126]

Atomic models were developed through indirect observation even though no one had seen an atom. There were many experiments of which I know nothing about, but in the end the scientists managed to come up with a formula and various models to describe atoms.

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3 years ago

In an isolated system, mass can neither be created or destroyed. ube FALSE TRUE

Marina86 [1]

Answer:

True

Explanation:

The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.

Hope it helps

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3 years ago