20 Points and Brainliest if you answer in 5 mins

Help me with my work please thanks?!

masya89 [10]

Answer:

lighting a match or water and salt

5 0

3 years ago

What is the relationship between a problem statement and the hypothesis?

dlinn [17]

An hypothesis is the proposed explanation that is made on the basis of limited evidence and it serves as the starting point for further investigation while a problem statement is a clear, concise description of the problems which needs to be addressed.
Problem statement is used to concentrate the focus of the researcher at the beginning, to keep him on track during the operation and at the end it is used to evaluate if the process delivered an outcome that solve the problems.
Hypothesis is used to define the relationship between two variables at the end of the research the scientist has to decide when its starting hypothesis is valid or not.<span />

3 0

4 years ago

Which of the following best describes a fission reaction involving lithium? (1 point)

boyakko [2]

Answer:

D, ABC, C, A, ?, B, A, ?, B, C, D, D, C, D

Explanation:

(Answers and explanations in order of questions)

Fission reactions are when the nucleus of an atom splits producing smaller nuclei and energy

Lack of space isn't a safety risk

Coal, natural gases, and oil all are burned to create energy which releases carbon into the atmosphere, polluting it. Nuclear power doesn't burn carbon-based substances and so is fine

I dunno but C and D are wrong

All of them are technically renewable?

Geothermal energy uses the Earth's heat, hence the name

Nothing can happen if people ignore it

Unsure

Synthetic polymers are plastics, which do not decay naturally

A base would react with the acid to neutralise it which is the fastest way to improve the lake

Not pesticides?

Oil spills kill aquatic animals and life quickly, which causes huge damage to ecosystems

If nothing changes nonrenewable things will run out and bad practices will have caused irreparable damage worldwide

Big factories are pumping out the bad stuff

4 0

3 years ago

Read 2 more answers

The teacher puts you in charge of measuring the pH of a marked solution of 0.0050 M HCL. What is the pH of this

g100num [7]

Answer: The pH of given solution is 2.3

Explanation:

It is given that the concentration of HCl solution is 0.005 M.

pH is the negative logarithm of concentration of hydrogen ions.

$pH = -log [H^{+}]$

Substitute values into the above formula as follows.

$pH = -log [H^{+}]\\= - log (0.005)\\= 2.3$

Thus, we can conclude that the pH of given solution is 2.3

3 0

3 years ago

What is the change in internal energy (in J) of a system that releases 675 J of thermal energy to its surroundings and has 530 c

ryzh [129]

The internal energy of a system is 1542.52 J.

First we convert calories into joule, 530 calories =530 calories × 4.184J

= 2217.52 J

Formula, ΔE = q + w

Here, the system releases heat, so q is negative

Therefore, ΔE = -q + w

Now, put the values of q and w

ΔE = -675 + 2217.52 J

ΔE = 1542.52 J

Internal energy is the sum of ability power of the gadget and the machine's kinetic strength. The alternate in internal energy (ΔU) of a response is equal to the heat gained or lost (enthalpy trade) in a reaction whilst the reaction is administered at steady pressure. inside the study of thermodynamics, a usually perfect gasoline is taken into consideration as a running substance. The molecules of an ideal gasoline are mere mass points that exert no force on each other.

The SI derived unit used to degree strength or paintings. One joule is identical to the electricity used to accelerate a body with a mass of 1 kilogram using one newton of force over a distance of one meter. One joule is also equal to one watt-second.

Learn more about internal energy here:- brainly.com/question/1370118

#SPJ4

5 0

2 years ago