Which of the following may indicate that a chemical reaction has occurred?
a. release of energy as light
b. a color change
C. gas bubble formation
d. All of the above

Answers

Answer 1

Answer:

D, all of the above

Explanation:


Related Questions

is the lorax story relevant today society?

Answers

Answer:

well i would say yes because how the factory made the air bad and how they all were fighting just about a tree

Explanation:

Answer: LOL XD no because of CO/VID

Explanation: BRAINLIEST PLS LOL

Theresa creates an experiment where she mixes two red-colored substances together in a container and observes the solution slowly changing from red to blue for the next eight minutes. The solution becomes completely blue after eight minutes. What does this represent about the type of change happening in the container?

Answers

Complete Question:

Theresa creates an experiment where she mixes two red-colored substances together in a container and observes the solution slowly changing from red to blue for the next eight minutes. The solution becomes completely blue after eight minutes. What does this represent about the type of change happening in the container?

Group of answer choices

A. A chemical change started immediately and finished at eight minutes.

B. A non-chemical change started immediately and finished at eight minutes.

C. A chemical change occurred at four minutes.

D. A non-chemical change occurred at four minutes.

Answer:

A. A chemical change started immediately and finished at eight minutes.

Explanation:

A chemical reaction can be defined as the chemical process which typically involves the reaction between two or more chemical elements (substances) to form a new compound, through the rearrangement of the ionic or molecular structure of each chemical element.

This ultimately implies that, a chemical reaction is a chemical change that immediately starts when two or more molecules of a chemical element (substance) known as reactants are combined together to form a new product (compound).

In this scenario, Theresa creates an experiment where she mixes two red-colored substances together in a container and observes the solution slowly changing from red to blue for the next eight minutes. The solution becomes completely blue after eight minutes. Thus, what this represent about the type of change happening in the container is that, a chemical change (from red to blue) started immediately and finished at eight minutes.

Help Please I'll mark Brainiest!


Write three observations that could help you identify this organism.

Answers

The shape of the organism is a huge factor, as it could fact for a different creature and/or organism every time. For example, a antelope may have a different form or structure of let’s say a spider, as this is the significant factor of ones shape, the first observation.

Secondly, the colors. As different organism come in different areas of reflections of light, it can easily be identified with this certain color and the way that the light reflects on it. This is another form of visual appearance, and important factor in identification.

Lastly, the pattern. As located on the back, the spikes/thread-looking things sticking out plays a huge factor in finding the organism name and/or identifying it. Every organism has a different pattern, humans being a huge one, all different

Observational studies of organisms is significant to our lives, and it’s greatly helped progress our sciences and society.

Answer:

the unidentified animal  looked like a slug, it looked like it lives or can be in water, the body of the unidentified animal is purple, it seems to have an orange spikes coming out of it's backs.

Is radium usually considered as part of the alkaline earth category in terms of chemistry?

Answers

Explanation:

Radium (atomic number 88) has similar properties to barium and is also in the Group 2 category. However, radium is a radioactive element and is generally under the category of radioisotopes in addition to being an alkaline earth metal, because it is not a stable element.

Use the graph to determine the instantaneous speed at 2 seconds.

What is the average speed over the entire trip?

Answers

Answer:

The instantaneous speed at 2 seconds =

3 m/s

The average speed over the entire trip is

2 m/s

Explanation:

Answer above is wrong and doesn't state anything about the answer, so this is the correct answer hope this helped! :)

Answer:

1.) 3 m/s   2.) 2 m/s

Explanation:

I hope this helps!!

A student uses a magnet to move a 0.25kg metal ball. The magnet exerts a force of 5N on the ball. What is the acceleration of the ball when it begins to move ?

Answers

Answer:

20 m/s²

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

[tex]a = \frac{f}{m} \\ [/tex]

f is the force

m is the mass

From the question we have

[tex]a = \frac{5}{0.25} \\ [/tex]

We have the final answer as

20 m/s²

Hope this helps you

What is the frequency of a light wave who has a wavelength of 5.5 x 10-14 m v

Answers

Answer:5.45×10^21

Explanation:

Use:f=c/λ

PLEASE HELP! ITS URGENT! I GIVE BRAINLY

Using the Law of Conservation of Matter, determine the number of grams of iron sulfide (FeS) that will be produced in this reaction.112g Fe + 64g S → _____ g FeS *

a. 48g
b. 64g
c. 112g
d. 176g

Answers

Answer:

Its C

Explanation:

If you think about it logically all the other answers don't make sense A and B are to small of a number And D is to Big of a number

Hope this Helps!!

If a parent cell has 24 chromosomes , how many chromosomes will each daughter cell have? Then compare the chromosomes in the parent cell and the daughter cells.

Answers

Answer:

If a cell has 24 chromosomes before cell division then daughter cell resulting from mitotic division will have 24 chromosomes while daughter cell resulting from the meiotic division will contain 12 chromosomes each.

Explanation:

When an atom becomes a negative ion, it

Answers

It becomes a positives atom. Since it loses electrons it has more of a positive charge than a normal atom.

it becomes positive right? im pretty sure

What is mass movement give examples

Answers

Answer: Mass wasting is the movement of rock and soil down slope under the influence of gravity. Rock falls, slumps, and debris flows are all examples of mass wasting.

what did bohr consider electrons as?

A. Discrete particles
B. Continuous particles
C. Particles with zero energy
D. None of the above

Answers

Answer:

D?

Explanation:

I think D hmm is the answer if I am wrong pls anyone or someone type the right answer but for me is d

Answer:

NOT D!!!!

Explanation:

I am taking the quiz on ck12, it is NOT "none of the above"

Complete this sentence. If mass remains the same while the volume of a substance ________, the density of the substance will_______________.
(NOT GIVING BRAINLIEST, JUST ANSWERING A QUESTION MOST PEOPLE GOT WRONG ON)
A. decreases, decrease
B. increases, decrease
C. increases, stay the same
D. decreases, stay the same
**It's D**

Answers

Answer:

B. Increases, Decreases

Explanation:

I majored in Chemistry

PLEASE HELP ME MY MOM COMES HOME SOON!! ITS 4AM!!
Blaire is teaching her little brother to ride his bike. She uses 7 N of force to push a 14 kg bike. What is the acceleration?
98 m/s2
0.5 m/s2
21 m/s2
2 m/s2

Answers

Answer:

The solution is

Explanation:

a = f/m

a =7/14

a=1/2

a=0.5

Acceleration of bike is 0.5 m/s²

Given that:

Force used in push = 7 N

Mass of bike = 14 kg

Find:

Acceleration of bike

Computation:

Force = Mass × Acceleration

Force used in push = Mass of bike × Acceleration of bike

7 = 14 × Acceleration of bike

Acceleration of bike = 7 / 14

Acceleration of bike = 0.5 m/s²

Learn more:

https://brainly.com/question/16685492?referrer=searchResults

How many atoms are present in 1.4 grams of aluminum?

Answers

Answer: 3.2x10^23

Explanation:

Start by finding the molar mass of aluminum.

Then turn  grams into moles by dividing grams of substance by molar mass. 1.4g÷26.98g

Then multiply that by 6.022x10^23 atoms. 0.0519x6.022x10^23

You can use dimensional analysis to solve this type of problem.

Is science logical please help meeeeeee

Answers

Answer:

It kind of is logical so my answer is yes

Yes science is logical

* The cost of table salt and table sugar is Rs 15 per kg.
and Rs 69 per kg respectively calculate their cost per mole?​

Answers

Cost per mole

Table salt : Rs 0.878

Table sugar : Rs 23.63

Further explanation

Given

Cost table salt (NaCl) = 15/kg

Cost table sugar(sucrose-C12H22O11) = 69/kg

Required

cost per mole

Solution

mol of 1 kg Table salt(NaCl ,MW= 58.5 g/mol) :

[tex]\tt mol=\dfrac{1000~g}{58.5}=17.09~mol=Rs~15\rightarrow 1~mol=Rs~0.878[/tex]

mol of 1 kg Table sugar(C12H22O11 ,MW= 342 g/mol) :

[tex]\tt mol=\dfrac{1000}{342}=2.92~mol=Rs~69\rightarrow 1~mol=Rs~23.63[/tex]

Balance equation PLEASSEEE HELPPP MEEE ​

Answers

Answer:

2AgNO₃ + MgCl₂ ⇒ 2AgCl + Mg(NO₃)₂

Explanation:

Match both sides of the equation. practice practice

How many moles of oxide are in 0.050 g of Iron(III) oxide?

Answers

Answer:

0.00031311017345051

Apple juice can be classified as which of the following?
O A compound
An Element
O A mixture
O A pure substance

Answers

Answer:

mixture

Explanation:

Answer:

Mixture

Explanation:

Which example shows how genetic engineering can be used in the agricultural industry?

A.
Two tomato plants that produce sweet tomatoes are crossed to produce offspring that also produce sweet tomatoes.
B.
A horse is bred with a donkey to produce a hybrid offspring that has characteristics of both parents.
C.
A gene for pest resistance is inserted into the genome of a corn plant.
D.
A sheep is cloned to produce an exact copy of the original sheep.

Answers

Answer:

c. a gene for pest resistance is inserted into the genome of a corn plant

Explanation:

Answer: A duh

Explanation:

becastse

The partial symbol for a particular ion is 26M2+ What are the number of electrons contained in one ion

Answers

Answer:

24

Explanation:

26-2=24 because when an atoms loses 2 electrons it gains 2+ charge

Need help!!! Don’t understand

Answers

A) Neither carbon nor oxygen has satisfied the octet rule

To begin with...

The bond between carbon and oxygen is suppose to have 3 bonds in between

Second:

The lone pairs are not drawn. Since carbon monoxide has 3 bonds in between it should have a lone pair (2 dots) left over on each atom.

Reminder: in order to satisfy the octet rule EACH atom must have 8 electrons. Carbon has 4 valence shell electrons and oxygen has 6. In order to satisfy this rule, there should be 3 bonds in between which makes a total of 6 for each atom plus the lone pairs that make up the 8.

I hope that’s not too confusing, if you still have any questions please let me know in the comments (:

7. Some products or processes claim to be "chemical free" or say "no chemicals added." Based on your understanding of chemistry, what are the arguments for and against such statements?

Please i need help ​

Answers

Pulongtoy saputong pinkoy ni bingkoy pukyo amen

The meaning behind the statement is that the products does not contains any synthetic and harmful chemicals such as colourants, preservatives etc.

What are synthetic chemicals?

All natural products or materials contains certain kind of chemicals which are naturally made in them. Such chemicals are natural chemicals and does not harm the living or causes any unwanted reaction.

The chemicals which are made by humans for specific purposes are called synthetic chemicals. Which can be of toxic and hazardous. Almost all materials we use everyday such as toothpastes, shampoo, food items, dyes, medicines  and the fertilizers and pesticides we use in agriculture are all chemicals.

These chemicals helps in some way but they can be harmful to life in other way. Some products claim that they are chemical free, may true or not they intending to clear that the product does not contain any synthetic chemical except the required natural chemicals.

To find more about synthetic chemicals, refer the link below:

https://brainly.com/question/19938248

#SPJ2

Good day pleases help

Answers

I can’t see the choices can you take another picture of this assignment please so i can help you
The answer is b. Wolves work together

"Indicate in each whether the following electron configurations correspond to an atom in its ground state, excited state, or is impossible."

a. [tex]{1s}^{2} {2s}^{2} {2p}^{4} [/tex]

b. [tex] {1s}^{2} {2s}^{2} {2p}^{3} {2d}^{1} [/tex]

c. [tex] {1s}^{2} {2s}^{2} {2p}^{3}{3s}^{1} [/tex]

d. [tex] {1s}^{2} {2s}^{1} {2p}^{2} [/tex]

e. [tex] {1s}^{2} {2s}^{2} {2p}^{1} [/tex]

f. [tex] {1s}^{2} {2s}^{3} [/tex]

Please, I really need help. I don't know what to do...

Answers

Answer:

Explanation:

Firstly, let's define what ground and excited state electronic configuration.

Ground state electronic configuration is when the electrons of the atom are in there lowest possible energy level while excited state electronic configuration is when electron(s) have moved to a higher energy level. Examples of these are provided in the options

a. 1s²2s²2p⁴ - This is a ground state electronic configuration (of oxygen) because the electrons are in there lowest possible energy level.

b. This option is not displaying (it is displaying something like an image that isn't loading)

c. 1s²2s²2p³3s¹ - We can see from this that an electron jumped from 2p energy level to 3s (p energy level ought to be completely filled with 6 electrons before another electron moves to the next energy level) meaning the electron is in it's excited state thus this is an excited state electronic configuration (of oxygen).

d. 1s²2s¹2p² - We can see from this also that an electron jumped from the 2s energy level to the 2p energy level (making it 2p² instead of 2p¹ in the ground state). The 2s energy level should ordinarily have 2 electrons. Thus, this is an excited state electronic configuration (of boron).

e. 1s²2s²sp¹ - This is a ground state electronic configuration (of boron) since all the electrons are in there lowest possible energy level.

f. 1s²2s³ - This configuration is impossible because the s energy level should only contain a maximum of 2 electrons, thus impossible to have 3 electrons in the s energy level

What are some ways that scientists use to model chemical reactions?

Answers

Answer:

they identify factors that affect chemical processes then they determine the amount of substance produced or consumed then predict the amount of energy released or absorbed

Cobalt (Co) has an atomic mass of 59 and an atomic number of 27. Which statement correctly describes an atom of cobalt?

A. An atom of cobalt contains more neutrons than protons.
B. An atom of cobalt contains more electrons than protons.
C. An atom of cobalt contains the same number of neutrons and protons.
D. An atom of cobalt contains the same number of neutrons, electrons and protons.

Answers

Answer:

A

Explanation:

27 us the number of protons when we subtract 27 from 59 it will be 32 because a mass number is the sum of proton and neutron but tell u more on the comment

Answer: A - An atom of cobalt contains more neutrons than protons.

Explanation: The atomic number is the number of protons in an atom. The atomic mass is the sum of protons & neutrons in an atom. So, with simple math we can figure out the number of neutrons. Total 59 - 27 protons = 32 neutrons. Which means that A is the only right answer in this case.

Little Extra: A & B would both be correct if Cobalt was a negatively charged ion. An atom is an ion if it is charged, and an ion is either negatively charged or positively charged. For example, if Cobalt had 27 protons & 26 electrons it's overall charge would be positive since it has more protons than electrons. And it would be negatively charged if Cobalt had 27 protons & 28 electrons. No charge if there are 27 protons & 27 electrons because proton +1 and electron -1. Imagine 27-27=0 no charge, 27-26= +1 charge, 27-28= -1 charge

I hope this made you smarter.

3. (10 Points) Write a double replacement reaction where one of the products is
copper (11) oxide. Include the states of matter for each of the reactants and
products.

Answers

Answer:

Up to now, we have presented chemical reactions as a topic, but we have not ... A single-replacement reaction is a chemical reaction in which one element is ... single-replacement reactions will occur between two given reactants. This is ... Use the activity series to predict the products, if any, of each equation.

Explanation:

(oh no)
What is the mass of silicon when there are 1.8 x 10^21 atoms of silicon?

Answers

Answer:

Mass = 0.084 g

Explanation:

Given data:

Mass of silicon = ?

Number of atoms of silicon = 1.8 × 10²¹ atom

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³  atoms

1.8 × 10²¹ atom × 1 mole /  6.022 × 10²³  atoms

0.299× 10⁻² mol

0.00299 mol

Mass of silicon:

Mass = number of moles × molar mass

Mass = 0.00299 mol × 28.1 g/mol

Mass = 0.084 g

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