All categories

2 years ago

EASY 8TH GRADE SCIENCE PLEASE HELP

Chemistry

1 answer:

oksano4ka [1.4K]2 years ago

5 0

Digesting bread is an example of physical change.
Hope this helps!

You might be interested in

A solution contains 1 LaTeX: \times\:×10−4 M OH– ions. Calculate the solution pH value, and determine if the solution is acidic,

oksano4ka [1.4K]

Answer: The pH value of the solution is 10 and the solution is basic in nature.

Explanation:

To calculate the pH of the solution, we need to determine pOH of the solution. To calculate pOH of the solution, we use the equation:

$pOH=-\log[OH^-]$

We are given:

$[OH^-]=1\times 10^{-4}M$

Putting values in above equation, we get:

$pOH=-\log(1\times 10^{-4})\\\\pOH=4$

To calculate pH of the solution, we use the equation:

$pH+pOH=14\\pH=14-4=10$

There are three types of solution: acidic, basic and neutral

To determine the type of solution, we look at the pH values.

The pH range of acidic solution is 0 to 6.9
The pH range of basic solution is 7.1 to 14
The pH of neutral solution is 7.

As, the pH of the solution is 10 and is lying in the range of basic solution, so the solution is basic in nature.

5 0

3 years ago

A reaction in which small nuclei combine to form a heavier nucleus is called______

Novay_Z [31]

Answer:

The answer to your question is: Nuclear fussion

Explanation:

In Chemistry there are 2 nuclear processes:

Nuclear fission: is the process in which the nucleus of a radiactive element splits into two smaller nucleus, or two elements woth lower atomic number.

Nuclear fussion, is a reaction is which to small nucleus combine to form a heavier element.

8 0

3 years ago

A solution is 0.0433 m lif. what is the molarity of the solution if the density is 1.10 g/ml

Otrada [13]

Molarity is the number of moles of solute in one liter of solution whereas molality is the number of moles of solute present in 1 kilo gram of solution.

Molarity is denoted by M and molality denoted by m

$m = (n) * (1000 /w_A) = 0.0433 m$

$M_B = 26 g /mol$

$W_A = 1 kg = 1000 g$

$(W_B /26) * (1000 /1000) = 0.0433$

$W_B = 1.12 g$

Mass of solution

$W_B + W_A = 1.12 + 1000 = 1001.12 g$

Density of solution = 1.1 g /mL

d = 1.1 = (W_B + W_A) /V

$1.1 = (1001.12) /V$

V = 910.11 mL

molarity of solution is:

$M = (n) * (1000 /V)$

= 0.0433 /0.910 = 0.0474 M

Thus, moalrity of solution is 0.0474 M

5 0

2 years ago

Three solutions are mixed together to form a single solution; in the final solution, there are 0.2 mol pb(ch3coo)2, 0.1 mol na2s

RUDIKE [14]

We are given the compounds:

0.2 mol pb(ch3coo)2, 0.1 mol na2s, and 0.1 mol cacl2

Pb will react with both S and Cl to form a solid compound, therefore:

Pb+2 + S-2 ---> PbS(s) 
Pb+2 + 2Cl- ---> PbCl2(s) 

Lead(II) sulfide and Lead(II) chloride will precipitate.

8 0

3 years ago

Read 2 more answers

A glycerol with three fatty acids attached is referred to as a ______.

icang [17]

Triglyceride is an ester that is derived from a glycerol with three fatty acids attached to it. It is also known as triacylglyceride and triacylglycerol. Triglyceride are the main components of body fat in humans, some other animals and vegetable as well.

Answer: Triglyceride or Fat

5 0

3 years ago