All categories

3 years ago

What does the little 2 in 2CO2 mean?

Chemistry

1 answer:

Olenka [21]3 years ago

4 0

Answer:

it means 2 oxygen atoms in the molecule

Explanation:

You might be interested in

Which of these elements has physical and chemical properties most similar to Sulfur (S)?

andreev551 [17]

A) Selenium - is apart of Sulfur family

8 0

3 years ago

Which of the following experimental methods cannot be used to measure the rate of a reaction?

irga5000 [103]

Answer:

I think a is the best answer. but really I can not confirm that.sorry for that.

7 0

3 years ago

Read 2 more answers

What usally happens when two continentel plates converge

ira [324]

<span>crunching and folds the rock at the boundary, lifts it up and leads to the formation of mountains </span>

5 0

3 years ago

Two 10g blocks, one of copper and one of iron, were heated from 300 K to 400K (a temperature difference of 100 K).

12345 [234]

1) 385 J

2) 450 J

Explanation:

The amount of energy that must be absorbed by a certain substance in order to increase its temperature by $\Delta T$ is given by the equation:

$Q=mC\Delta T$

where

m is the mass of the substance

C is its specific heat capacity

$\Delta T$ is the increase in temperature of the substance

For the block of copper in this problem, we have:

m = 10 g is the mass

$C=0.385 J/gK$ is the specific heat capacity of copper

$\Delta T=400-300 = 100 K$ is the change in temperature

So, the energy absorbed by the block of copper is

$Q=(10)(0.385)(100)=385 J$

Similarly for the block of iron, the energy absorbed by the iron is given by

$Q=mC\Delta T$

where

m is the mass of the block of iron

C is its specific heat capacity of iron

$\Delta T$ is the increase in temperature of the block

Here we have:

m = 10 g is the mass of the block

$C=0.450 J/gK$ is the specific heat capacity of iron

$\Delta T=400-300 = 100 K$ is the change in temperature

So, the energy absorbed by the block of iron is

$Q=(10)(0.450)(100)=450 J$

6 0

3 years ago

What is the atomic size going across a period (left or right)? what causes this trend?

natka813 [3]

The atomic size decreases; this is because as you go across the period, more electrons are found in the outer shell. As more electrons are added, the more attraction there is between the protons, in the nucleus, and the electrons, making the atom smaller.
Hope this helps!

5 0

3 years ago