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Marysya12 [62]
3 years ago
13

Chemical reactions _____.

Chemistry
2 answers:
AlexFokin [52]3 years ago
8 0
I put in the answers over there and they weren't all right according to the question.
for number 1 is was D(you got that right), 2 was A.heat is supplied to the reaction(it sowed a triangle symbol, not a yield one). 3 was D(you got this one right). 4 was D. the reaction is reversible. 5 was A.1,3,1, 3 
aalyn [17]3 years ago
7 0

1) Chemical reactions produce new substances

Ans (d)

2) The symbol, Δ in a chemical reaction means that heat of supplied to the reaction.

Ans (a)

3) A skeleton equations does not show the reaction stoichiometry, i.e. the relative amounts of reactants and products.

Ans (d)

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A decrease in height of a column in a mercury barometer means that
insens350 [35]

Answer:

increase in the air pressure

Explanation:

The barometer is a device that is used for measuring the air pressure. It is a device that uses mercury in order to show the air pressure. The mercury reacts easily to the changes in the air pressure, so it is a nice indicator for it. The air pressure can simply be defined as the weight of the air masses, and the pressure they make it because of it on the objects. The lower the air pressure, the higher up the mercury will go, as it will experience less pressure from the air, and the higher the air pressure, the lower the mercury will drop, as it will experience more pressure from the air.

5 0
3 years ago
What is the chemical formula for zinc?
sergiy2304 [10]
ZnO
is the answer for what is the chemical formula for zinc?
8 0
3 years ago
on a hot summer day, water droplets often form on the outside of a cold glass. the water droplets form when water vapor in the a
dangina [55]


this is known as condensation when cold and warm temperatures meet


7 0
3 years ago
While exploring a coal mine, scientists found plant fossils in the ceiling of the mine which had been preserved by an earthquake
ale4655 [162]

Answer:

11552.45 years

Explanation:

Given that:

Half life = 5730 years

t_{1/2}=\frac{\ln2}{k}

Where, k is rate constant

So,  

k=\frac{\ln2}{t_{1/2}}

k=\frac{\ln2}{5730}\ years^{-1}

The rate constant, k = 0.00012 years⁻¹

Using integrated rate law for first order kinetics as:

[A_t]=[A_0]e^{-kt}

Where,  

[A_t] is the concentration at time t

[A_0] is the initial concentration

Given that:

The rate constant, k = 0.00012 years⁻¹

Initial concentration [A_0] = 160.0 counts/min

Final concentration [A_t] = 40.0 counts/min

Time = ?

Applying in the above equation, we get that:-

40.0=160.0e^{-0.00012\times t}

e^{-0.00012t}=\frac{1}{4}

-0.00012t=\ln \left(\frac{1}{4}\right)

t=11552.45\ years

7 0
3 years ago
Nikolas, the fire extinguisher, and the skateboard have a combined mass of 50 kg. What force would the fire extinguisher have to
murzikaleks [220]

Answer:

Force used by fire extinguisher = 60 N

Explanation:

Given:

Mass of skateboard with fire extinguisher = 50 kg

Acceleration of fire extinguisher = 1.2 m/s²

Find:

Force used by fire extinguisher = ?

Computation:

⇒ Force = Mass × Acceleration

⇒ Force used by fire extinguisher = Mass of skateboard with fire extinguisher × Acceleration of fire extinguisher

⇒ Force used by fire extinguisher = 50 kg × 1.2 m/s²

⇒ Force used by fire extinguisher = 60 N

3 0
3 years ago
Read 2 more answers
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