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den301095 [7]
4 years ago
11

Is this statement true or false?

Chemistry
1 answer:
Verdich [7]4 years ago
4 0

Answer:

This statement is true.

Explanation:

Palaeontology can be described as the field of science under which the history of the earth is studied. Scientists use fossils to study the history of the earth as they provide evidence for history.

Fossils can be described as the remains of old, dead plants, animals, fungi, prokaryotes which are imprinted on rocks. These imprints provide evidence for the kind of organisms that once inhabited the land. For examples, fossil studies showed the existence of dinosaurs which are now extinct.

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Your Turn!
crimeas [40]

Answer:

because.......

...........

.........

3 0
3 years ago
Omg pls help i dunno what the frick frack this is
snow_lady [41]

Answer:

1. Mass of KCl produced = 774.8 g of KCl

2. Mass of KNO₃ produced = 13.837g

3. Moles of NaOH made = 0.846 moles

4. Moles of LiCl produced = 0.846 moles

5. Moles of CO₂ produced = 207.6 moles

Explanation:

1. From the equation of reaction, 1 mole of ZnCl₂ produces, 2 moles of KCl.

5.02 moles of ZnCl₂ will produce, 2 × 5.02 moles of KCl = 10.4 moles of KCl

Molar mass of KCl = (39 + 35.5) g/mol = 74.5 g/mol

10.4 moles of KCl = 10.4 × 74.5 g

Mass of KCl produced = 774.8 g of KCl

2. Mole ratio of KNO₃ and KOH = 1:1

O.137 moles of KOH will produce 0.137 moles of KNO₃

Molar mass of KNO₃ = 101 g/mol

Mass of KNO₃ produced = 0.137 × 101 g = 13.837g

3. Molar mas of Ca(OH)₂ = 74.0 g

Moles of Ca(OH)₂ in 31.3 g = 31.3/74.0 = 0.423 moles of Ca(OH)₂

Mole ratio of NaOH and Ca(OH)₂ in the reaction = 2 : 1

Moles of NaOH made = 2 × 0.423 = 0.846 moles

4. Molar mass of MgCl₂ = 95.0 g

Moles of MgCl₂ in 40.2 g = 40.2/95.0 = 0.423 moles

From the reaction equation, mole ratio of MgCl₂ and LiCl = 1:2

Moles of LiCl produced = 2 × 0.423 = 0.846 moles

5. From the equation of reaction, 1 mole of C₆H₁₀O₅ produces 6 moles of cO₂

34.6 moles of C₆H₁₀O₅ will produce 34.6 × 6 moles of CO₂

Moles of CO₂ produced = 207.6 moles

4 0
3 years ago
How does the chemical structure of water change when it changes state?
Bad White [126]
When the water is heated, the water molecules bounce around and spread out.
When the water is normal, they are pretty close-knit but still flow around. 
When the water is frozen, they are frozen in place and do not move. 
I hope this helped :) 
4 0
3 years ago
The provided balanced equation applies to the reaction that takes place between lithium hydroxide and sulfuric acid. 2LIOH + H,S
Brilliant_brown [7]

Answer: 61.28 grams !!

Explanation:

6 0
3 years ago
What main criterion determines major divisions in the geologic time scale?
koban [17]

The answer is B. the occurrence of huge events in Earth's natural history

The geologic time scale is a system of chronological dating that relates geological strata to time. It is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that have occurred during Earth's history.

4 0
3 years ago
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