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1 year ago

QUESTION 3 and 4 please

Chemistry

2 answers:

Katena32 [7]1 year ago

8 0

Answer:

The answer to question 3 should be C. Summarizing the results.
The answer to question 4 should be D. Comparing data from the experiment to the prediction of the hypothesis.

Explanation:

Rashid [163]1 year ago

5 0

Answer: For question 3 Your answer will be C

For question 4 your answer will be D

Explanation:

this is because this part of a scientific hypothesis and cycle.

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2.<br> How many moles are contained in 0.800 g of calcium chloride (CaCl2)?

Ronch [10]

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Calcium Chloride, or 110.984 grams.

7 0

2 years ago

An irregular chunk of iron has a density of 7.87 g/cm3. A 14.5 gram chunk is added to a graduated cylinder. If the final volume

bulgar [2K]

Answer:

37.96 mL

Explanation:

From the question given above, the following data were obtained:

Density (D) of iron = 7.87 g/cm³

Mass (m) of iron = 14.5 g

Volume of Cylinder + Iron = 39.8 mL

Volume of Cylinder =?

Next, we shall determine the volume of the chunk of iron. This can be obtained as follow:

Density (D) of iron = 7.87 g/cm³

Mass (m) of iron = 14.5 g

Volume (V) of iron =?

D = m/V

7.87 = 14.5 /V

Cross multiply

7.87 × V = 14.5

Divide both side by 7.87

V = 14.5 / 7.87

V = 1.84 cm³

Recall:

1 cm³ = 1 mL

Therefore,

1.84 cm³ = 1.84 mL

Therefore, the volume of the chunk of iron is 1.84 mL.

Finally, we shall determine the starting volume of the cylinder as follow:

Volume of Cylinder + Iron = 39.8 mL

Volume of Iron = 1.84 mL.

Volume of Cylinder =?

Volume of Cylinder = (Volume of Cylinder + Iron) – Volume of Iron

Volume of Cylinder = 39.8 – 1.84

Volume of Cylinder = 37.96 mL

Therefore the starting volume of cylinder is 37.96 mL

3 0

2 years ago

1. As you increase speed is there an increase or decrease in Kinetic Energy?

drek231 [11]

$\qquad \qquad\huge \underline{\boxed{\sf Answer}}$

1. As you increase speed is there an increase or decrease in Kinetic Energy?

$\qquad \sf \dashrightarrow \: increase$

2. As you increase mass is there an increase or decrease in Kinetic Energy?

<h3 />

$\qquad \sf \dashrightarrow \: increase$

3. As you decrease speed is there an increase or decrease in Kinetic Energy?

$\qquad \sf \dashrightarrow \: decrease$

4. As you decrease mass is there an increase or decrease in Kinetic Energy?

$\qquad \sf \dashrightarrow \: decrease$

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2 years ago

Limestone (CaCO₃) is the second most abundant mineral on Earth after SiO₂. For many uses, it is first decomposed thermally to qu

steposvetlana [31]

Limestone (CaCO₃) is the second most abundant mineral on Earth after SiO₂. For many uses, it is first decomposed thermally to quicklime (CaO). MgO is prepared similarly from MgCO₃.

AT 871°C CaCO 3 needs about 1 hour for complete decomposition.

<h3>At what temperature Caco3 decompose to Cao?</h3>

At any temperature higher than 835°C, the value of Δ G ∘ will be negative and the decomposition reaction will be spontaneous.

AT 871°C CaCO 3 needs about 1 hour for complete decomposition.

Calcium carbonate decomposes on heating to give calcium oxide and carbon dioxide.

To learn more about Caco3, refer

brainly.com/question/26187973

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1 year ago

2 H2 + 2 NO → N2 + 2 H2O the observed rate expression, under some conditions, is: rate = k[NO]2 Which of the following mechanism

guapka [62]