Chemistry Middle School

PLEEASEE HELP ITS PAST DUE AND IM GIVING BRAINLIEST

Which process is an example of a physical change?

a. wood burning in a camp fire
b. iron rusting on a bicycle chain
c. ice melting after a snow storm
d. milk souring because it is old

Answers

Answer 1

Answer:

c or d

Explanation:

i dont know which one but it's one of those

Related Questions

Which metals are so reactive that they are never found as uncombined elements in nature?

A. alkaline earth metals

B. alkali metals

C. rare earth metals

D. transition metals

Answers

B

This element is rare and it reacts very quickly to other elements

explain why the sun appers to be the brightest star in the sky. relate your explanation with an example such as street lights. this is science

Answers

Answer:

The sun is a star but It is the brightest in the sky because it is the closest star to earth.

I don't know how to compare it to street lights though...

Explanation:

Which of the following is a metal?


A. nitrogen

B. calcium

C. sulfur

D. carbon

Answers

Answer:  Calcium

Explanation: The chemical element Calcium (Ca), atomic number 20, is the fifth element and the third most abundant metal in the earth's crust. The metal is trimorphic, harder than sodium, but softer than aluminium.

Hope this helps. pls mark me brainliest :)

The answer is calcium


because it is in group 2 which makes it an alkaline earth metal and a powerful reducing agent that loves to react with nonmetals especially powerful oxidizing agents like fluorine and chlorine.

Which of these can be combined to make a mixture?

a. solid and a liquid
b. two solids
c. two liquids

Answers

Two liquids is the correct answer

Answer:

c

Explanation:

you cant mix a rock and a rock together and expect to get a mixture

and you cant mix a rock and water and expect them to mix

so its on logical that it is two liquids

What are characteristics of transition metals? Select all that apply. *
usually liquid or gas at room temperature
good conductors of heat and electricity
malleable
high density

Answers

Answer:

They are good conductors of heat and electricity

and have high density

Explanation:

transition metals are not usually liquid

they are good conductors of heat and electricity

high density

Why are lysosomes important?

Answers

When a cell is beyond repair, lysosomes help it to self-destruct in a process called apoptosis.

Answer: A lysosome is a membrane-bound cell organelle that contains digestive enzymes soooo. They break down excess or worn out cell parts, they may be used to destroy invading viruses and bacteria. If the cell is damaged beyond repair, lysosomes can help it to self-destruct in a process called programmed cell death, or apoptosis.

Explanation: So that's why it is important

(Subject is actually 8th Grade Science But The don't have that... i'm sorry.)

Question:

If you have two objects with different masses about to fall from the same height. Which one will have the greatest potential energy?


Group of answer choices:

A.) Smallest

B.) Largest

C.) Roundest

D.) Flattest

Answers

Answer:

I am Going to say the smallest im in 8th grade and i got that right

Explanation:

The smallest will have the greatest potential energy

The density of Mg is 1.74g/cm3. The density of strontium is 2.60g/cm3. What would you expect the density of Ca to be?

Answers

Answer:

1.61 g/cm³.

Explanation:

What is one advantage of developing energy-efficient technologies?

Answers

Answer:

it's simple

Explanation:

For residential buildings, a whole-house approach using a cost-effectiveness criterion can result in savings of 50 percent or more in heating and cooling and 30–40 percent reductions in total energy use.

I hope you understand have a great day :3

One advantage of developing energy-efficient technologies, would be less waisted money on electricity.

Which group of elements has the highest boiling point? * IIIa (13) IIa (2) Ia (1) IVa (14) Transition metals

Answers

Answer:

the elements that have the highest boiling is transition metals

Which material has the same state of matter after it is mixed with water as it did before it was mixed with water?

A.
carbon dioxide
B.
salt
C.
pepper
D.
sugar

Answers

A or C I’m not quite sure, pls correct me

Pepper has the same state of matter after it is mixed with water.

What is the state of matter?

State of matter of any substance tells about the physical appearance or the space occupied by the atoms of that substance.

From the given option; carbon dioxide, salt and sugar are soluble in water and changes their state of matter to liquid. But pepper is hydrophobic in nature that means it is not soluble in water, so present in the original state after mixing with water.

Hence, option (c) is correct i.e. pepper has the same state.

To learn more about state of matter, visit the below link:

https://brainly.com/question/16982523

Fill in the blank
The (blank) of a rock is a result of its mineral composition.

Answers

Fill in the blank
The (blank) of a rock is a result of its mineral composition.

Answer:

Color

Which of the following is a problem caused by acid rain?

respiratory problems in humans
is a factor in global warming
makes lakes and streams unsuitable aquatic life

Answers

Answer:

Air pollution like sulfur dioxide and nitrogen oxides can cause respiratory diseases, or can make these diseases worse. Respiratory diseases like asthma or chronic bronchitis make it hard for people to breathe.

Answer:

1st one

Explanation:

mark brainliest please

Offspring, or young, ______ to look like their parents, but are ___ the ________.
PLLLLELELELELELLEXZZZZZZZAnsnnsnsnwnnwWEDDRFRFRRFR PLSSSSXSSSXD

Answers

Answer:

Tend. Similar. Parents. (sorry if it's wrong. It's kinda confusing on the last 2 words. Make it more clearer pls to get a better answer)

Explanation:

HELP ME PLEASE
T-T thanks

Answers

Answer: You Would have to .

Explanation:

A tool might be made of an alloy because the alloy _____.


A. occurs naturally

B. resists rust

C. can bend easily

D. is softer

Answers

I assume the answer is: A
~Hello Wonderful Person~

Your answer is:

B. Resists rust.

A tool might be made of an alloy because the alloy resists rust.

Why?

Iron is a great building material but steel (an alloy made by adding small amounts of non-metallic carbon to iron) is stronger, harder, and rustproof. Aluminum is a very light metal but it's also very soft in its pure form.

Alloy steels have a wide range of special properties, such as hardness, toughness, corrosion resistance, magnetizability, and ductility. Nonferrous alloys, mainly copper–nickel, bronze, and aluminum alloys, are much used in the coinage.

____________________________________________________________

Hope this helps!

⊕If this answer does not answer your question or displeases you, tell me in the comments and I will try to find the right answer and replace it ASAP. Thank you.⊕

Have a good day.

Watch the video below. After the video use the text box to answer the following questions:

1. What is the difference between and autotroph and a heterotroph?

2. What is one example of an autotroph. One example of a heterotroph.

Please help the video isn't necessary for these questions :)

Answers

autotrophs are producers and they prepare their own food. heterotrophs are consumers that depend on other sources for their food.

autotroph ex. plants, algae, some types of bacteria

heterotroph ex. dogs, birds, all humans
^ , i argee with them .

I would appreciate your help! Due today! ( I don't know if this is even chemistry)

Answers

Answer:

6+69

Explanation:

this is the photo of the first page

How many moles of Hg are in a thermometer that contains 0.055 mL of Hg?

Answers

Answer:

745.8

Explanation:

Answer:

745.8

Explanation:

I hope this helps, and correct I mostly guaranteed is correct.

If an atom does not bond to another, The number of electrons does not change. True or false?
Please help!

Answers

the answer is true .....
your answer is true!!

I REALLY NEED HELP ITS DUE AT 11:59 PM

Answers

Answer:

I attached a photo of balanced equations but thats as much as I can help.

Explanation:

well all I know is that reactants are like ingredients to make a product so I would say that h2+O2 are the reactants and the arrow is directing that it makes h20 which is your product

The most useful property of metalloids is their _____.

A. stored energy which is released through combustion

B. being non-reactive with other elements

C. value when used to make precious jewelry

D. varying ability to conduct electricity

Answers

Answer:

DDDDDDDDDDDDDDDDDD

Explanation:

i just answer this it's corect trust meee
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