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3 years ago

PREDICT Do you think warming a cannonball in a fire has any effect

1 answer:

5 0

I think yes because the heat from the fire will transferred to the cannon ball and it will cause something with its energy to change effect.

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The arrows shown in the asthenosphere represent the inferred

nata0808 [166]

Red arrows represent the movement of the mantle due to convection. Black arrows represent the movement of the plates due to gravity. Scientists think that this transfer of thermal energy from core to mantle causes convection in the mantle.

8 0

3 years ago

If 0.40 mol of H2 and 0.15 mol of O2 were to react as completely as possible to produce H2O what mass of reactant would remain?

liberstina [14]

Answer : The mass of reactant $H_2$ remain would be, 0.20 grams.

Solution : Given,

Moles of $H_2$ = 0.40 mol

Moles of $O_2$ = 0.15 mol

Molar mass of $H_2$ = 2 g/mole

First we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

$2H_2+O_2\rightarrow 2H_2O$

From the balanced reaction we conclude that

As, 1 mole of $O_2$ react with 2 mole of $H_2$

So, 0.15 moles of $O_2$ react with $0.15\times 2=0.30$ moles of $H_2$

From this we conclude that, $H_2$ is an excess reagent because the given moles are greater than the required moles and $O_2$ is a limiting reagent and it limits the formation of product.

The moles of reactant $H_2$ remain = 0.40 - 0.30 = 0.10 mole

Now we have to calculate the mass of reactant $H_2$ remain.

$\text{ Mass of }H_2=\text{ Moles of }H_2\times \text{ Molar mass of }H_2$

$\text{ Mass of }H_2=(0.10moles)\times (2g/mole)=0.20g$

Therefore, the mass of reactant $H_2$ remain would be, 0.20 grams.

3 0

3 years ago

Name the region of the atom where protons and neutrons are located.

inn [45]

Answer:

Nucleus

Explanation:

5 0

3 years ago

Name the compound PF3

bonufazy [111]

Phosphorus trifluoride (formula PF3), is a colorless and odorless gas. is similar to carbon monoxide and this is very toxic according to my research. hope this helps.

8 0

3 years ago

I don't know how to transcribe the following DNA sequecne too rna

Llana [10]

Answer:

There is only one change when transcribing from a DNA sequence to a RNA sequence.

Explanation:

The change when transcribing is that instead of thymine (T) in a DNA sequence, you have Uracil (U) in a RNA sequence. The rest will stay the same. So, DNA has ATCG, whereas RNA has UACG. There should be NO thymine (T) in your RNA sequence–– it should only include the four of the following: UACG.

[FORMAT]: DNA is to RNA

A is to U (IMPORTANT, NO "T") –– Think as Apples Under the Tree

T is to A –– Think as Trees have Apples

C is to G –– Think as Car in the Garage

G is to C –– Think as Inside the Garage are Cars

3 0

3 years ago