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3 years ago

Sitting at a four-legged table there is: 1 grandma, 2 moms, 2 daughters and a granddaughter. How many legs are under the table?

Chemistry

1 answer:

lbvjy [14]3 years ago

3 0

Answer:

The answer is 14 "legs"

Explanation:

There are 2 legs per person so 10 legs (5 people * 2) plus the 4 legs the table has.

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How many joules of energy are made by the loss of 100kg of mass using the formula E=mc2? please help!!!

asambeis [7]

Answer:

E = 3 × 10¹⁰ J

Explanation:

Mass, m = 100 kg

We need to find energy made by the loss of 100 kg of mass. The formula between the mass and energy is given by :

E = mc²

Where c is speed of light

Putting all the values, we get :

E = 100 kg × (3×10⁸ m/s)²

= 3 × 10¹⁰ J

So, the required energy is 3 × 10¹⁰ J.

6 0

3 years ago

4 moles of hydrogen react with 5 moles of oxygen to form water, identify the excess reagent?

Fynjy0 [20]

Answer:

Excess Reagent = oxygen

Explanation:

Limiting reagent: The substance that is totally consumed when the reaction is completed.

Excess reagent: The substance left after the limiting reagent is consumed completely

The balanced chemical equation for formation of water is as follow:

$2H_{2}+O_{2}\rightarrow 2H_{2}O$

This means when 2 moles of hydrogen reacts with 1 mole of oxygen, 2 moles of water is produced.

Hence the ratio in which hydrogen and oxygen gas reacts is 2:1

Now if 2 mole hydrogen require 1 mole of oxygen ,then 4 mole hydrogen need 2 mole of oxygen.

$H_{2}:O_{2}=2:1$

$H_{2}:O_{2}=4:2$

Here 5 mole of oxygen is reacting but only 2 mole is required .

Oxygen is in excess.

5 0

3 years ago

Ca(OH)2 + HCl CaCl2 + H2O Choose the acidic and basic radical a) H,O b) Ca,H c) Cl,O d) Ca,Cl

Snowcat [4.5K]

Answer:

Answer is Option A

Explanation:

it's the correct answer

5 0

3 years ago

Which can occur in a physical change?<br> The mass can increase

solong [7]

In a physical change the form changes or the state of the matter. For instance water can freeze and water can melt, but it is still water.

Please vote my answer brainliest! Thanks.

3 0

3 years ago

1.0 mole of KCl(aq) is added to which solution to produce a precipitate?

taurus [48]

Answer:

Ag+

Explanation:

If you imagine as if the problem were double replacement, you would pair the Cl with one of the following ions provided in the choices. As seen on Table F, Ag+ paired with Cl- produces an insoluble compound, hence the precipitate. All the other ions shown in the multiple choice section, when paired with Cl- will produce a soluble compound, as a result NOT a precipitate.

7 0

2 years ago