Sara is watching television when the power goes out. When she walks to the kitchen to get a candle, she knocks over a chair. She lights a match and holds it to the wick of the candle. She uses the light from the candle to find her way to the chair, which she picks up and sits in. Which of the events was a chemical change? *

Answers

Answer 1

Answer:

She lights a match and holds it to the wick of the candle.

Explanation:

Chemical change produces the required products of reactants by an irreversible reaction. For there to be a chemical change, a chemical reaction between reactants must occur.

Lighting of a match is a chemical change in which the friction between the match box and the gun powder on the stick produces a flame. This reaction produces a product by an irreversible process. After the flame burns out the wick of the candle, it can not be reversed.


Related Questions

Which of the following organelles are matched together with the correct energy conversion that they perform? Mitochondria: Chemorespiration Chloroplast: Cell Division Mitochondria: Chemorespiration, , Chloroplast: Cell Division, Mitochondria: Cellular Respiration Chloroplast: Photosynthesis Mitochondria: Cellular Respiration, , Chloroplast: Photosynthesis, Mitochondria: Chemosynthesis Chloroplast: Photorespiration Mitochondria: Chemosynthesis, , Chloroplast: Photorespiration, Mitochondria: Photosynthesis Chloroplast: Cellular Respiration

Answers

Mitochondria: cellular respiration
Chloroplast: photosynthesis

The questions are in the pic, they are about gravity :)

Answers

2. Because the gravitational force from anything that small compared to a planet is so minuscule it's nearly impossible to feel or measure.

3. Because do not have life and other processes necessary to create the gasses and substances necessary to create an atmosphere.

4. If the amount of mass lost was large enough it would likely allow the moon to eventually orbit away

if guanine replaces with cytosine in erd codon of gene 4, what will happen to the organism

Answers

Can cause mutations

What type of mutation is the following: ATCGAC to TTCGAC
a)point
b)insertion
c) deletion

Answers

Answer:

c) deletion is the type of mutation in the following

The answer is a) point.

What do aerobic respiration and anaerobic respiration have in common?
O Both begin with glycolysis.
Both occur in mitochondria.
O Both require oxygen to proceed.
O Both end with the electron transport chain.

Answers

Answer:

A. Both begin with glycolysis

Correct on 2020 Engenuity

-They had it first so credit to them.

Answer:

a

Explanation:

which organelle converts chemical energy stored in food into compounds that are more convenient

lysosomes
membrane
mitochondria
nucleus

Answers

the answer is - mitocondria

A cell moves particles from a region of lesser concentration to a region of greater
concentration by
1)facilitated diffusion
2)passive transport
3)osmosis
4) active transport

Answers

Answer:

facilitated diffusion

Explanation:

Best if luck pal

A cell moves particles from a region of lesser concentration to a region of greater concentration by Facilitated Diffusion.

Facilitated Diffusion in the cell body is the passive movement of particles  across a plasma membrane from a region of higher concentration to a region of lower concentration

Examples of biological processes that undergo  facilitated diffusion are

The movement of glucose and amino acid into the cell from the bloodstream.The transport of carbon dioxide(gas )from the lungsion transport.

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In chili peppers, hot (H) flavor is dominant over mild flavor (h). If a chili grower wanted to grow only hot peppers, which of the crosses below would produce the largest number of hot flavored offspring? (Make a punnett square using the answer choices to find the correct answer.)

Answers

In punnett square, the crossing result will be HH,Hh,HH,Hh which means all are going to be hot chili peppers since H (dominant) is present in all of them.

What do you mean by punnett square?

The Punnett square is a square diagram that is used to predict the genotypes of a particular cross or breeding experiment. It is named after Reginald C. Punnett, who devised the approach in 1905.

A Punnett Square is a helpful tool that helps to predict the variations and probabilities that can come from cross breeding.

The diagram is used by biologists to determine the probability of an offspring having a particular genotype.

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The movement of molecules into the cell through transport proteins in the cell membrane is a type of what

Answers

Answer:

diffusion

Explanation:

Good luck!

What is the function of enzymes in biological systems?

Answers

Answer:

Enzymes help speed up chemical reactions in the human body. They bind to molecules and alter them in specific ways. They are essential for respiration, digesting food, muscle and nerve function, among thousands of other roles.

Explanation:

Brainliest please?

HELP!! Which of the following is NOT true of protein structure?
A: Proteins' secondary structure is dictated by peptide bonds.

B: Proteins' tertiary structure is dictated by R group bonds.

C: Proteins have quaternary structure when they are arranged together.

Answers

The statement that is not true related to the protein structure is option b.  Proteins' tertiary structure is dictated by R group bonds.

What is protein structure?

It is classified as the  three dimensional shape of the protein.

In the tertiary structure it does contain the  single polypeptide chain that we called as the backbone or there more than one protein secondary structures

Also, it should not be dictated by R group bonds.

Therefore, we can conclude that the option b is correct.

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Answer:  A)

Explanation:

Most autotrophs convert the sun's energy into chemical energy that is stored in macromolecules, which they then use to ____ and ____.

Answers

Answer:

provide structural support ,  speed biochemical reactions

Explanation:

How do sediments eroded by water become more smooth and round​

Answers

Answer: Liquid water is the major agent of erosion on Earth. Rain, rivers, floods, lakes, and the ocean carry away bits of soil and sand and slowly wash away the sediment causing it to become more round and smooth.

I hope this helps!

Answer:

through friction.

Explanation:

The sediments rub together to become smoother. Sediments that are transported in a mass by water or stream are in motion with respect to the motion of the stream water. They bump into each other which makes extruding parts vulnerable to getting knocked off which makes these particles round.

name the two things a fetus does to prepare for birth​

Answers

Answer:

They found that changes in telomeres, part of our DNA that responds to aging, become present in the amniotic fluid as the placenta and other pregnancy tissues get older. These cells could be telling the baby that it's time to be born.

Explanation:

Answer:

During the 28th and 32nd weeks of pregnancy, the baby will begin turning itself into a head-down position, and the baby will also move lower in the pelvis.

Explanation:

What type of articulation moves the least?
O cartilaginous joints
o fibrous joints
o synovial joints
O ball-and-socket joints

Answers

The answer is Fibrous joints

Answer:

fibrous joints

Explanation:

There is no cavity, or space, present between the bones and so most fibrous joints do not move at all, or are only capable of minor movements.

you where these terms were introduced.
1. Describe the difference(s) between the
following terms.
(a) concentrated and dilute (4.1)
(b) acid and base (4.2)

Answers

Answer:

A. concentrated is the substance on its own, dilute is the substance mixed with (diluted) water.

B. an acid increases the concentration of H+ ions. A base is a substance that releases hydroxide (OH-) ions (in aqueous solution, donates electrons and accepts protons)

Explanation:

Which example is not an organism?

bacteria

lung

mold

human​

Answers

Mold is not an organism.

Answer:

Lung

Explanation:

The movement of waves in the middle of the ocean is normally
static
vertical
circular
horizontal

Answers

Answer:

Vertical

Explanation:

Since we are talking about movement, and the ocean can't be static due to many things happening around and inside it can't be static.

It is not circular and not horizontal. It is vertical. The movement of waves is vertical and this is because waves don't move up and down but vertically since wind is the usual maker of waves in the middle of the ocean.

The formula CaCl, represents the compound

Answers

Answer:

It represents the compound calcium chloride

Explanation:

Calcium chloride is the correct answer ....

Which of the following could be seen directly In a karyotype of an unborn baby?

Answers

Answer: teeth.

Explanation:

The _______ is responsible for maintaining homeostasis within any cell
Answer: Cell Membrane

Answers

Answer:

cell membrane

Explanation:

The structure most responsible for maintaining cell homeostasis is the cell membrane.

Why would you answer your own question lol

lol cell membrane...

In coastal areas, the large amount of salt in the air and water determines which species can exist there. In these areas, the salt functions as a
A
source of energy
B
growth catalyst.
ОООО
С
limiting factor
D
food source

Answers

Answer:

D

Explanation:

the salt provides for some animals

In the areas where amount of salt in the air and water determines species that can exist the salt functions as a ; ( D ) Foodsource

Meaning of Food source

Given that salt is an essential part of food and the amount of salt in the air and water determines the species located in an area ( coastal area ), the salt in this scenerio will function as a food source responsible for the existence of species.

Hence we can conclude that In the areas where amount of salt in the air and water determines species that can exist the salt functions as a ; ( D ) Foodsource

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A particle of a compound is called what?

Answers

It’s called a molecule :)
A compound is made up made up of molecules so the answer is a molecule

How are mitosis and meiosis different processes?
Your answer:
A. Mitosis makes exact copies of cells, while meiosis makes cells with half as many chromosomes as they started
with.
B. Mitosis destroys cells while meiosis makes new cells.
C. Mitosis is used to make gamete cells like sperm and egg, but meiosis is used to make new body cells like skin cells

Answers

I think the answer is a but i’m not sure

what cultural changes did bipedalism cause

Answers

Taller creatures were able to reach higher places for food and interact with different creatures. This changed life when parents had to care for their young for a longer period of time and for working together :))

Answer: Taller creatures were able to reach higher places for food and interact with different creatures. This changed family life when parents had to care for their young for a longer period of time and for working together.

Explanation:

In the image below, what atom is shown in white? URGENT!!!!

Answers

Answer:

Pick Hydrogen, but read below.

Explanation:

The blacks are Carbon. They have 4 connections. The left Carbon has 3 whites connected to it. It is not totally an exclusive answer, but the whites could be anything in Column 17 (F, Cl, Br, I) or Hydrogen. Likely it is hydrogen.

The answer is Hydrogen

Trapped oil can be discovered by geologists and extracted through __________.

Multiple choice question.
cross out

A)
mining

cross out

B)
drilling

cross out

C)
excavating

cross out

D)
climbing

Answers

Answer:

I think it is c

Explanation:

why are casts, molds, and trace fossils so common?

Answers

Answer:

Cast fossils occur when mold fossils are filled in with minerals that harden over time, creating a fossilized replica of the original organism. Water seeps through the rock surrounding the mold fossil, leaving behind minerals which fill the mold. Any mold fossil can potentially form a cast mold.

Explanation:

Answer:

Cast fossils occur when mold fossils are filled in with minerals that harden over time, creating a fossilized replica of the original organism. Water seeps through the rock surrounding the mold fossil, leaving behind minerals which fill the mold. ... Any mold fossil can potentially form a cast mold

Explanation:

pls make me brainliest

Widow's peak is a dominant trait (W). Tongue-rolling is a dominant trait (T). Two people who are heterozygous for both traits (widow's peak, tong-roller) get married and have children. Complete the Punnett square to show the parents the probabilities for each child, then answer the question that follows.
What is the probability that the parents will have a child without a widow's peak and unable to roll his tongue?

Group of answer choices

3/16

9/16

0/16

1/16

Answers

Answer:

The correct answers are -

A. 1)  WWTt    2) WWTt   3)WwTt   4)wwTT

B. 1/16

Explanation:

We know that each gene have minimum two alleles or forms of the gene one is dominant and the other is recessive. So, it is given that W is dominant trait that represents widow's peak so the recessive allele would be w, similarly for the tongue-rolling trait dominant is T n recessive would be t.

So the dihybrid cross of heterozygous parents for both is shown in the punnet square given which lack few possibilities that can easily be carried out by the gametes mention there that are

1. WWTt  by WT and Wt gamets

2. WWTt  by WT and Wt

3)WwTt   by Wt and wT

4)wwTT by wT and wT

And the possibility of a child without a widow's peak and unable to roll his tongue would be possible only if the alleles are recessive for the both trait which is one out of 16 in punnet square thus the possibility would be - 1/16

Which gas directly increases the global temperature the most?

Answers

Answer:

Greenhouse Gases

Explanation:

A greenhouse gas (GHG) is any gas in the atmosphere that absorbs and emits radiation in the thermal infrared range. These are the fundamental cause of the greenhouse effect, which results in increased temperatures on Earth.

Answer:

CO2 increases global warming temp the most followed by CFCs ( chlorofluorocarbons) which are used in refrigerators and ACs but now banned.

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