Answer:
Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding. Often, physical changes can be undone, if energy is input.
Explanation:
Helpppp
4. This group of substances tend to be malleable, ductile, and have relatively high melting points.
They are
(2 Points)
A.noble gases
B.nonmetals
C.metals
D.halogens
Answer:
The answer is metals
A student found a 500 cm3 sample of vinegar. Knowing that vinegar is a solution of ethanoic acid (CH3COOH) and water, this student decided to take a 25.0 cm3 sample, dilute it with 25.0 cm3 of water and then react it with sodium hydroxide. The dilute sample required 37.0 cm3 of 0.850 mol dm–3 sodium hydroxide solution to react entirely with it via the following reaction:
CH3COOH(aq) + NaOH(aq) → NaCH3COO(aq) + H2O(l)
Calculate the concentration of ethanoic acid in the original sample of vinegar.
Answer:
1.26mol/dm3
Explanation:
In order for radiation to transfer heat
Answer:
Radiation is a method of heat transfer that does not rely upon any contact between the heat source and the heated object as is the case with conduction and convection. Heat can be transmitted through empty space by thermal radiation often called infrared radiation. This is a type electromagnetic radiation
Answer:
Heat can be transmitted through empty space by thermal radiation often called infrared radiation
Explanation:
Brainliest???? Plzzz!!!
What is the volume of a box that has a length of 5 cm a width of 7 cm and a height of 9 cm
Answer:
V = L × w × h
V = 5 × 7 × 9
V = 315 cm³
Sodium has______ Valence electrons and bismuth has ________ electrons
Please help ASAP on market as brainlister
Answer:
Sodium has 1 valence electron and bismuth has 83 electrons (5 valence electrons)
Explanation:
Calculate the volume of a rock that has a mass of 24 g and a density of 8 g/mL
Answer:
24g÷8g/ml=3
volume =3
Which is a chemical property of oxygen?
1.It reacts with iron to form rust.
2.It is a gas at room temperature.
3.It expands when heated.
4.It combines to form O 2 molecules.
Answer: I think the answer is 1
i just learned this about two weeks ago
Explanation:
DNA and RNA have base pairs that form hydrogen bonds with complementary bases. The DNA molecule shown contains adenine, cytosine, guanine, and thymine. Which base does RNA not have?
A) Thymine B) Adenine C) Guanine D) Cytosine
Answer:
Thymine
Explanation: I took the test
The DNA molecule shown contains adenine, cytosine, guanine, and thymine. The base that RNA does not have is Thymine. The correct option is A.
What are DNA and RNA?DNA and RNA both are genetic materials, and they both represent the genetic material of living organisms. All animals contain DNA in their body. Some plants or bacteria contain RNA as genetic material.
DNA and RNA both contain bases that are attached with a hydrogen bond. These bases are adenine, cytosine, guanine, and thymine. In RNA, the same bases are present.
In RNA, in place of thymine, there is uracil present. Uracil and adenine are joined together with a hydrogen bond. Cytosine and guanine are present together with a hydrogen bond.
Thus, the correct option is A.Thymine, regarding the base present RNA.
To learn more about DNA and RNA, click here:
https://brainly.com/question/26931852
#SPJ2
.What threatens the newly hatched chicks?
Answer:
rats. that's all i know of Just about everything except the mother hen if they are natural hatch. Even when you incubate them there are threats. The healthy chicks will mob the weak ones, the older chicks (even by a day) will pick on the younger ones. Temperature extremes will threaten them as they need warm, humid conditions with gradual drops in surrounding temps in the brooder box. Early disease is sometimes a problem and all chicks should be started on medicated chick feed for the first few weeks to prevent several digestive diseases. Even the water dispenser can be a threat as newly hatched chicks will immerse themselves in an open water container so care should be taken to supply water in a self feeding covered dish.
Explanation:
Answer:
im pretty sure its just rats and the mother hen if the chick isn't healthy
Explanation:
WILL GIVE YOU BRAINLIEST!!!
which option is an example of a chemical property?
A ability to decompose
B color
C melting point
D density
which option is an example of a chemical property
A boiling point
B reactivity
C color
D density
Answer:
A ability to decompose
B reactivity
Explanation:
Chemical properties are those properties that tell us about what a substance can do as regards to whether or not the substance reacts with other substances.
Examples are flammability, rusting of iron, precipitation, decomposition of water by an electric current.
The ability to decompose and reactivity are chemical properties of a substance.
Physical properties tells us everything about what a substance is when no change is occurring to its constituents. Examples are state of matter, color, odor, taste, texture, hardness e.t.cAnswer:
1. A
2. B
Explanation:
Chemical property does change the composition of a substance.
I took the test before. I got all the answer correct and got 100% score.
You can see my other article just search in search engine with: Learningandassignments diy4pro
Click on my site and find these related article post:
Learning Properties of Matter Quiz Unit 2 Lesson 11 Grade 8
Hope it helps.
#diy4pro
Jimmy's science textbook reflects blue light. What color is the book?
How does an increase in thermal energy influence the particles of the reactants in a chemical reaction?
Group of answer choices
it increases the chance of particles being properly aligned by increasing the number of collisions
it decreases the number of particle collisions
it increases the number of collisions by speeding up the particle motion
Answer:
the last one it increases number of collisions by speeding up the particle motion
Explanation:
the more thermal energy something it has the faster particles move
moles in 9.01x10^23 molecules water
Answer:
The answer is 1.50 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{9.01 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{9.01}{6.02} \\ = 1.496677740...[/tex]
We have the final answer as
1.50 molesHope this helps you
Answer: 1.50 moles
Explanation:
The amount of kinetic energy an object has depends on which feature of the object?
Answer:
mass
Explanation:
The amount of kinetic energy an object has, depends on its mass and its speed.
Answer: motion
Explanation:
I just took the quiz in edging
Elements in group 16 of the periodic table usually
Answer:
The oxygen family, also know as the chalcogens, consists of the elements found in Group 16 of the periodic table and is the main group elements.
Elements: oxygen, sulfur, selenium, tellurium and polonium.
Hope this helps! :D
Which two systems does the nervous system work with to direct behavior
and movement? *
O digestive and respiratory
muscular and skeletal
O excretory and digestive
circulatory and digestive
To solve this we must be knowing each and every concept related to nervous system. Therefore, "the muscular and skeletal system " is the correct option.
What is nervous system?The nervous system serves as a link between the environment and the organism's interactions. The nervous system coordinates actions or sensory information by sending and receiving signals to and from various sections of the body.
The peripheral and central systems are the two sections of the nervous system. They aid in the appropriate step-by-step coordination of the many physical reactions and communications from the parts of the body to the brain and back. The muscular and skeletal system, the nervous system work with to direct behavior and movement.
Therefore, "the muscular and skeletal system " is the correct option.
To learn more about nervous system, here:
https://brainly.com/question/13487019
#SPJ2
A sample of matter is made up of three different atoms that are chemically combined. What
type of matter is it? How do you know?
Answer:
liquid
Explanation:
a molecule consists of different atoms chemically combined. A molecule is also a liquid. Molecules make up ice cubes, which are also small water particles which arr yet again liquid.
The hottest place in California is Death Valley with a record temperature of 130 ⁰F. Calculate the temperature in ⁰C and K.
Answer:
54.(4)° C (the 4 in the parentheses means the 4 goes forever), 327.594°K
Explanation:
When you convert 130°F to °C, you will get 54.(4)°C, and the 4 in the parentheses goes forever, and 130°F to °K is 327.594°K, hope it helps!
Which element would you expect to have the largest radius based on the Periodic Table?
Lead
Selenium
Chlorine
Answer:
Lead
Explanation:
As you move down the periodic table, the elements get larger and gain additional electron shells, increasing the radius. In order, they are on the table as Chlorine, Selenium, Lead.
A number in front of a chemical formula
Group of answer choices
subscript
coefficient
Answer:
the answer is coefficient
Answer:
Coefficient is your answer
HOPE THIS HELPED YOU
PLEASE MARK AS THE BRAINLIEST (ㆁωㆁ)
Question 5 (4 points)
One type of dipole-dipole force found in water is
A. ion-ion attraction
B. hydrogen bonds
C. dipole-ion bonds
D. molecular bonds
Answer:
B. Hydrogen bonds.
Explanation:
The dipole dipole force that is found in water is hydrogen bonds.
Identify the atom
H₄
CH₄
N
Answer:
Organic Molecule.
Explanation:
Any molecule with C atoms and H atoms are organic molecules in chemistry.
Examples could be C₄H₅, C₉H₁₈O₆, C₅H₁₂N.
How do you convert in the metric system?
Answer:
To convert among units in the metric system, identify the unit that you have, the unit that you want to convert to, and then count the number of units between them. If you are going from a larger unit to a smaller unit, you multiply by 10 successively. If you are going from a smaller unit to a larger unit, you divide by 10 successively
Explanation:
hope it helps
pleaseee help.....ASAP
will mark branliest!!
and give extra points!
Answer:
C
Explanation:
All three can become negative versions: negative ions
Answer:
It is going to be D because Group 1 A and 2 A are s block elements which are METALS, also they are not halogens as the 7 A group is called halogens, Plus they give +1 oxidation state so Correct answer is D as they are group 1 A elements so they have only one valence electron in their valence shell
I WILL GIVE U BRAINLIEST IF U HELP ME!!!!!
Answer:
your awnser is B cutting back
does anyone know how to do the alien periodic table im stuck and cant go furhter
Answer:
The answers that I drew in blue are for the first part then it will say click a nonmetal or something which is the one I drew in Red.
Explanation:
Hope this helps
Which one of the following is the symbol used in a chemical equation for a
gas?
A. (g)
B. (aq)
C. (gas)
D. (a)
Answer:
A. (g)
Explanation:
Since it asks for a gas, it is A.
Answer:
A (g)
Explanation:
experimented with oil and water layers in 1917. He proposed that the
in the oils pointed away from the water
• A. Charles Overton, phosphate heads
. B. Irving Langmuir, fatty acid chains
• C. Hugh Davson, proteins
. D. Gregor Mendel, fatty acid chains
Answer:
Irving Langmuir, Fatty Acid Chains
Explanation:
The man that experimented with oil and water layers in 1917 and also proposed that the ________ in the oils pointed away from the water is:
B. Irving Langmuir, fatty acid chainsIrving Langmuir was an American scientist who was interested in the fields of Chemistry, Physics and Engineering. He won an award in Chemistry for his contributory research in surface chemistry.
He made an experiment with oil and water layers in the year 1917 and he made the claim that the fatty acid chains in oils always pointed away from tje water in which they were immersed in.
Therefore, the correct answer is option B
Read more here:
https://brainly.com/question/2396276
Which has the longest wavelength?
Which has the highest frequency?
Answer:
Which has the longest wavelength?
✔ microwaves
x infrared
x visible
x X-rays
Which has the highest frequency?
✔ X-rays
x infrared
x microwaves
x visible
Explanation:
I apologize if this was a late answer or if this doesn't answer your original question, but hope this helps! :)
Answer:
Microwaves then X rays
Explanation:
If an unknown sample contains 39.04% sulfuric acid by mass, then a 0.9368 g of that sample would require _____ mL of 0.2389 M NaOH for neutralization.
A) 31.22
B) 39.98
C) 7.80
D) 79.96
E) 15.61
Please give an answer and an explanation, thanks!
Answer:
A) 31.22
Explanation:
The reaction of sulfuric acid with NaOH is:
H₂SO₄ + 2 NaOH → Na₂SO₄ + 2H₂O
To solve this problem we need to determine the moles of acid that will react, and, using the chemical equation we can determine the moles of NaOH and the volume that a 0.2389M NaOH solution would require to neutralize it.
Moles H₂SO₄ (Molar mass: 98.08g/mol):
0.9368g * 39.04% = 0.3657g H₂SO₄ * (1mol / 98.08g) =
3.7289x10⁻³moles H₂SO₄
And moles of NaOH that you require to neutralize the acid are:
3.7289x10⁻³moles H₂SO₄ * (2 moles NaOH / 1 mole H₂SO₄) =
7.4578x10⁻³ moles NaOH
Using a 0.2389M NaOH solution:
7.4578x10⁻³ moles NaOH * (1L / 0.2389mol) = 0.03122L = 31.22mL
Right answer is:
A) 31.22