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Marina86 [1]
3 years ago
9

11.You run 100 m in 25 s. If you then run the same distance in less time, does your aver- age speed increase or decrease? Explai

n.
Chemistry
1 answer:
Sergeu [11.5K]3 years ago
5 0
Ur average speed increases bc ur moving faster
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Which statement describes the masses of the particles that make up an atom?
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<span>An atom is the smallest component of matter that keeps all of the chemical properties of an element. Atoms merge to form molecules, which then connect to form solids, gases, or liquids. Atoms are made up of three basic particles: protons, electrons, and neutrons. Atoms have different properties based on the order and number of their basic particles. Protons and neutrons have accurate mass, about 1.67x10 -24 grams.</span>

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3 years ago
Bismuth has a density of 9.80 g/cm^3. What is the mass of 3.02 cm^3 bismuth?
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Explanation: idk am sorry

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2.How could you identify an element by its<br> number of protons?
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The number of protons determines an element's atomic number (Z) and distinguishes one element from another. For example, carbon's atomic number (Z) is 6 because it has 6 protons. The number of neutrons can vary to produce isotopes, which are atoms of the same element that have different numbers of neutrons.

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What did Dalton determine about the relationship between atoms, elements, and compounds?
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2 KClO_2 produces 2 KCl+ 3O_2 when heated. If this reaction produces 82.8 g of KCl how many grams of O2 were produced?
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Answer:

37.046 grams of oxygen gas were produced.

Explanation:

2KClO_2\rightarrow 2KCl+ 3O_2

Moles of potassium chlorite = \frac{82.2 g}{106.5 g/mol}=0.7718 mol

According to reaction 2 moles of potassium chlorite gives 3 moles of oxygen gas.

Then 0.7718 moles of potassium chlorite will give:

\frac{3}{2}\times 0.7718 mol=1.1577 mol of oxygen gas.

Mass of 1.1577 moles of oxygen gas:

1.1577 mol × 32 g/mol = 37.046 g

37.046 grams of oxygen gas were produced.

4 0
4 years ago
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