All categories

2 years ago

PLS HELP THIS IMPORTANT

Chemistry

2 answers:

Ksenya-84 [330]2 years ago

8 0

Answer:

Explanation:

Physical change is a temporary and reversible change in which the physical properties of the substance changes without altering the composition of the substance Eg Melting of ice while chemical change is a permanent and not so easily reversible change in which the identity of the substance is altered to produce one or more substances Eg Combustion

sergey [27]2 years ago

6 0

Answer:

Physical change is a rapid change, while chemical change can be a time taking process. In chemical change, new products are produced, while physical change can change the shape or size of said object, but no new products are formed.

Explanation:

You might be interested in

What is the formula for the compound nitrogen monoxide? express your answer as a chemical formula?

Lina20 [59]

Formula for the compound nitrogen monoxide is NO.
Below is the structure:

5 0

3 years ago

How many moles of n are in 0.185 g of n2o?

pickupchik [31]

The mass of $N_{2}O$ is 0.185 g.

To calculate the number of moles first calculate the molar mass of $N_{2}O$ .

$M_{N_{2}O}=2\times M_{N}+M_{O}$

Molar mass of nitrogen and oxygen is 14 g/mol and 16 g/mol respectively

Thus, $M_{N_{2}O}=2\times 14 g/mol+18 g/mol=44 g/mol$

Now, number of moles can be calculated from mass and molar mass as follows:

$n=\frac{m}{M}=\frac{0.185 g}{44 g/mol}=0.0042 mol$

Therefore, number of moles of 0.185 g $N_{2}O$ is 0.0042 mol.

8 0

3 years ago

Read 2 more answers

Which is a way that biotechnology has Not helped society?

Trava [24]

New, stronger bacteria have evolved that are resistant to antibiotics.

3 0

3 years ago

Read 2 more answers

In a neutral atom, the number of protons is always equal to what other part of the atom?

Licemer1 [7]

Answer:

b. The number of electrons

Explanation:

A "neutral atom" has a neutral charge. This means that its charge is equal to zero. In order for the charges to cancel out each other, the atom's positive charge should be equal to the negative charge. These being said, the number of electrons (negatively-charged) is then equal to the number of protons (positively-charged). Those atoms which are not neutral are called "ions." This means that they either have more or less electrons than the protons.

7 0

2 years ago

Model describe how you would show j.j. thomson's model of the atom using small beads and clay

faltersainse [42]

Make a ball of clay and embed small beads throughout it. The plum pudding model.

5 0

3 years ago