Answer:
Nuclear decay is also called radioactive decay, and it occurs in a series of sequential reactions until a stable nucleus is reached. Nuclear reactions release much more energy—orders of magnitude more—than exothermic chemical reactions.
Explanation:
The mass of an object is measured in grams or kilograms TRUE OR FALSE
Answer:
True
Explanation:
The bigger mass is measured in kilograms and smaller in grams
Thread-like structures that are found in the nucleus of a cell that contains all DNA.
A.) DNA
B.) Genes
C.) Chromosomes
D.) Nucleus
Light-colored moths blend with light-colored tree bark in their environment. A moth with a dark- colored variation blends with dark-colored tree bark but stands out against light-colored bark. What environmental change would give the dark-colored moth in the picture an adaptive advanage and enhance its survival?
A. The dark-colored moth will have an advantage if it begins to feed at night.
B. If the climate warms, dark-colored moths will absorb more heat.
C. Light-colored moths will be killed more readily if the climate cools.
D. If a change in the environment causes most of the trees to darken, the dark-colored moth will have an advantage.
i’m not sure if this is even the right subject lol but anyways
List 4 interesting facts about the element Cobalt
Answer:
Cobalt was the first metal to be discovered since prehistoric times and the first metal with a recorded discoverer.
Cobalt-60 is used to create gamma rays which are used to treat cancer and to sterilize medical supplies.
Cobalt is one of only three naturally occurring magnetic metals, making it very useful for the uniquely calibrated magnets found in generators and hard drives. ...
Cobalt has been utilized by man for at least the last 2,600 years, providing blue pigments for glassware and ceramics.
Explanation:
Answer:
- Doesn’t exist naturally on earth.
- Isolated in 18th century
- we use cobalt for magnets
- isn’t rare
What is the final temperature of a sample of magnesium (c = 0.24 cal/g°C), if 1835 cal is
added to 612 g of magnesium at an initial temperature of 19.3°C?
Answer:31.8 °C
Explanation:
Delta T=?
C= .24 cal/g°C
M=612g
Q=1835
Delta T= 1835 cal/(.24cal/g°C)(612g)=12.50°C
Intial temp= 19.3°C
Add intial temp to new temp
12.50+19.3=31.8°C
A pine tree seed was produced by self-pollination. How many parents does this seed have?
A. one
B. two
The pine tree that produced the seed would be the only parent of a pine seed that was formed through self-pollination. So, the correct option is A.
What is Self-pollination?In the process of self-pollination, pollen from one flower or plant fertilizes the egg cells of another flower or plant. For self-fertilization to occur, both male and female reproductive components must be present within the same flower or plant.
The pollen from the male flower component, the anther, is carried to the female component, the stigma, during self-pollination either by the wind or by pollinators like bees, butterflies, or birds.
A pine tree that produces seeds will be the sole parent of pine seeds that form through self-pollination. Self-pollination occurs when pollen from the same pine tree fertilizes the pine tree's own egg cells, producing seeds with the genetic makeup of only one individual.
Therefore, the correct option is A.
Learn more about Self-pollination, here:
https://brainly.com/question/19910654
#SPJ2
I need help I tried many times and I don’t get it
Answer: ummm what is this cause I don't get it either
Explanation:
i need help with this to lol
chemical bonding explaining
Explanation:
A chemical bond is a lasting attraction between atoms, ions or molecules that enable the formation of chemical compounds. The bond may result frim the electrostatic force of attraction between oppositely charged ions as in ionic bonds or through the sharing of electrons as in covalent bonds.
would the air in a tire decreace or increase on a hot day
Answer:
The air pressure in tires increases as the temperature goes up. Scientists have figured out that for every 10 degrees (Fahrenheit) that the temperature rises the tire pressure will increase by one pound per square inch
Explanation:
Answer:
decrease
Explanation:
Match each label below with the appropriate term. Note there may be more than one correct answer.
H-0:
nonbonding electrons
sigma bond
represents two electrons
Answer:
sigma bond
represents two electrons
Explanation:
The bond between hydrogen and oxygen is sigma bond because the bond between hydrogen and oxygen is covalent means sharing of electron takes place between two atoms and we know that sigma bond is also occurs in a covalent bond in which overlapping of atomic orbitals or hybrid orbitals along the bond axis occurs. Both also represent two electrons because both atoms share one electron each so we can say that the two atoms represents two electrons.
Wind is created by air flowing from a low pressure area to a high pressure area. *
True
False
2.
Aluminium reacts with iron(III) oxide as shown.
iron(III) oxide + aluminium → iron + aluminium oxide
Which statement about this reaction is correct?
A
Aluminium is oxidised.
B
Aluminium oxide is reduced.
C Iron(III) oxide is oxidised.
D
Iron is oxidised.
Answer:
A is the answer..............
.............
What is the state of oxygen at -200 degrees celsius
Answer:
i think its going to be liquid
Explanation:
Does anyone know how kinetic energy and crater diameter are related??
Answer:
Crater size is related to the mass and velocity of the impacting body. Mass and velocity can be combined to find the kinetic energy of an impactor. ... This fundamental physical relationship allows an estimate of impactor mass to be made from crater diameter.
Explanation:
7 (Facts) 5 (things you though were interesting) 2 questions that you still have about ground water
PLS HELP ASAP
Explanation:
I just answer on a different account
What is the relationship between electrons and elements with
negative oxidation numbers? between electrons and elements
with positive oxidation numbers?
Explanation:
The higher its electronegativity, the more an element attracts electrons. The atom with higher electronegativity, typically a nonmetallic element, is assigned a negative oxidation number, while metallic elements are typically assigned positive oxidation numbers.... Hope it is useful brainliest plz if it was useful....
The relationship between electrons and oxidation number has bee the negative oxidation number implies the gain of the electron, while positive oxidation number implies the loss of electron by elements.
The oxidation number has been defined as the number of electrons lost or gained by an element to form a chemical bond. The elements that lose electrons are assigned positive oxidation number.
The elements that gain electrons to form a chemical bond are assigned a negative oxidation number.
The relationship between electrons and oxidation number has bee the negative oxidation number implies the gain of the electron, while positive oxidation number implies the loss of electron by elements.
For more information about oxidation number, refer to the link:
https://brainly.com/question/10079361
A 25°C, una solución de HNO3, de 5L de volumen tiene una concentración de 18% en peso. Si la densidad de la solución es 1,1 g/mL, determine la normalidad
Answer:
[HNO₃] = 3.14 N
Explanation:
Relacionando normalidad con molaridad, ydado que el HNO₃ tiene solo un protón, ambas van a coinicidir asi que calculando la molaridad, será lo mismo decir que ese valor pertenece a la concentración normal.
Densidad de solución = 1.1 g/mL
Volumen de solución = 5L = 5000 mL
Masa de solución = 1.1 g/mL . 5000 mL = 5500 g
Ahora usamos el % p/p.
Si sabemos que en 100g de solución hay 18 g de soluto
En 5500 g de solución tendremos (5500 . 18) /100 = 990 g
Convertimos a moles = 990 g . 1mol /63g = 15.7 moles
Como el volumen de solución es 5L = 15.7 mol /5L = 3.14 M = 3.14N
Basicamente para calcular la normalidad hay que saber calcular los equivalentes de soluto los cuales se expresan como
masa de soluto / Equivalentes gramo, donde los equivalentes gramo se definen como el peso molecular /valencia. En este caso como el acido nitrico es monoprótico, la valencia es 1, y haciendo el procedimiento usando densidad de solución y el % peso en peso, ya sacamos la masa de soluto.
990 g / 63g/mol / 1 = 15.7 Equivalentes
N = Equivalentes/L de solucion → 15.7 Eq /5 L = 3.14N
The normality is 3.14 N
Given that the Density of solution = 1.1 g/mL
Volume = 5L = 5000 mL
So, Mass of solution = 1.1 g/mL . 5000 mL = 5500 g
Now we use % w/w.
Given that in 100g of solution there is 18 g of solute
Hence 5500 g of solution contains
(5500 . 18) /100 = 990 g of solute
As the volume of the solution is 5L, to calculate the normality of the solution
N = Mass of solute in grams/(volume of solution in litres × Equivalent weight)
Equivalent weight = molar mass/ number of hydrogen ions
here the number of H ions = 1
hence, equivalent weight = 63/1 = 63
The Normality is 990/(5×63) = 3.14N
Learn more about Normality:
https://brainly.com/question/25507216
what are the formulas for the following elements?
-Beryllium fluoride
-Barium fluoride
-Strontium sulfide
-Titanium(II) chloride
-Iron(II) sulfate
-Vanadium(III) cyanide
Answer:
Beryllium fluoride - BeF2
Barium fluoride - BaF2
Strontium sulfide - SrS
Titanium(II) chloride - TiCl2
Iron(II) sulfate - FeSO4
Vanadium(III) cyanide - V( CN )3
In order to make 1 batch of cookies it requires 2 cups flour, 3 eggs, and 1 cup sugar. What would be the coefficients for the flour, eggs, and sugar, assuming you wanted to make 10 batches of cookies? Write the coefficients below!
PLEASE HELPPPPPP
Which of the following statements is correct for the equation shown here?
An emulsion is a suspension of a in a liquid.
Explanation:
An emulsion is a suspension of two liquids that actually do not mix together.these liquids that do not mix are said to be immiscible .an example :-
would be oil and water.lf you mix oil and water and shake them a cloudy suspension is formed
this is correct answer
I hope it's helpful for u....
What characteristics separate the class Insecta from other classes of the phylum Arachnida
Answer:
Three pairs of walking legs, wings, body divided into three segments, pair of sensory antennae.
Explanation:
Which of the following describes an orbital?
A student mixes a dark green solution with water, and the result is pale green. Is this likely a chemical change or not? Explain.
Answer:
This is not a chemical change
Explanation:
The dark green solution mixed with the water, but the water is still water. There were no bubbles, smell, temperature change, or any other signs of a chemical change
Have a great day!
A student mixes a dark green solution with water, and the result is pale green. This is a physical change.
What are physical change and chemical change?Composition distinguishes a physical change from a chemical change. A physical change is a difference inside the look, smell, or straightforward presentation of a material sample without the need for a change in composition, whereas a chemical change alters the makeup of the substances in issue.
Despite the fact that we refer to them as physical "reactions," nothing is actually changing. A change in the substance in question's elemental composition is necessary for a reaction to occur. So, from now on, we will simply refer to bodily "reactions" as physical changes. A student mixes a dark green solution with water, and the result is pale green. This is a physical change.
Therefore, a student mixes a dark green solution with water, and the result is pale green. This is a physical change.
To know more about physical change and chemical change, here:
https://brainly.com/question/11946229
#SPJ2
What is the formula for Iron(IV) phosphite
Answer:
The answer is Iron phosphide (Fe2P)
Can SOMEONE HELPPPPPP?????
Answer:
the answer is 28.086amu
Explanation:
There are three isotopes of silicon. They have mass numbers of 28, 29 and 30. The average atomic mass of silicon is 28.086amu. sorry it took me so long.
A scientist is using robots to perform thousands of experiments on different
chemical compounds to see how they affect cancer cells. What is this
process called?
A. An intravenous solution
B. Evaluating test results
C. Screening
D. Engineering process
A scientist is using robots to perform thousands of experiments on different chemical compounds to see how they affect cancer cells.This process is called Screening.
What is screening?The method to test diseases and health condition of body used by scientist and doctor is called screening. The screening helps to find problem earlier and treat them.
What is an intravenous solution?The liquid given to replace water, sugar and salt needed if you are ill or having operation.There are three type of an intravenous solution, isotonic, hypotonic and hypertonic.This an intravenous solution used in an intravenous therapy.What is evaluating test?The process by which of system and component are compared against requirement and specification through testing. The result of the evaluating test is called Evaluating test resultsWhat is Engineering process?The process used by Engineer design and create functional products. This process is a series of steps.To learn more about chemical compounds here.
https://brainly.com/question/12166462
#SPJ3
Answer: screening
Explanation:
314.5g HBr (MMHBr = 80.91g/mol), is mixed into 4.50L solution. Find Molarity (M) of the
solution.
Answer:
[tex]\boxed {\boxed {\sf M \approx0.864 \ M \ HBr}}[/tex]
Explanation:
The molarity of a solution is the moles per liter. It is found using this formula:
[tex]M=\frac { moles \ of \ solute}{liters \ of \ solution}[/tex]
First we must calculate moles, since we are given grams. To convert from grams to moles, the molar mass is used. This is also given to us, it is 80.91 grams per mole. We can use it as a ratio.
[tex]\frac {80.91 \ g \ HBr}{1 \ mol \ HBr}[/tex]
Multiply by the given number of grams.
[tex]314.5 \ g \ HBr *\frac {80.91 \ g \ HBr}{1 \ mol \ HBr}[/tex]
Flip the fraction so the grams of HBr cancel.
[tex]314.5 \ g \ HBr *\frac {1 \ mol \ HBr}{80.91 \ g \ HBr}[/tex]
[tex]\frac {314.5 \ mol \ HBr}{80.91 }=3.88703497714 \ mol \ HBr[/tex]
Now we know the moles, and can calculate the molarity.
There are 3.88703497714 moles of solute and 4.50 Liters of solution.
[tex]M= \frac {3.88703497714 \ mol }{ 4.50 \ L}[/tex]
[tex]M= 0.863785550476 \ mol/ L[/tex]
The original measurements have 4 and 3 significant figures, so we use the lowest number of 3 for our answer. For the number we calculated, that is the thousandth place.
The 7 in the ten thousandth place tells us to round the 3 to a 4.
[tex]M \approx 0.864 \ mol/ L[/tex]
[tex]M \approx 0.864 \ M \ HBr[/tex]
The molarity of the solution is about 0.864 M HBr.
Describe the effect of cooling a gas in a container?
Answer:
By cooling the gas in the container the partial pressure of the gas will cause the gas to condense. Imagine water vapor in a bottle if you cool it down it will condense into droplets as the molecules of gas start to slow down to to lower temp
Explanation:
As the water molecules re-freeze, what happens to the salt ions that are mixed in with the water?
Answer:
Explanation:
Since salt is composed of two ions Na+ and Cl- it will attract to the opposite poles of the water and form a ion-dipole bond. This will cause the phenomenon freezing point depression where as the name states it will take a lower tempertature to freeze it. So instead of freezing at 0 degrees c it will freeze at a negative 2 or so on.
The salt ions end up slowing the growth of ice as the water molecules re-freeze.
What is Depression at the freezing point?Freezing point depression can be defined as the decreasing of the freezing point of pure solvents upon the addition of different kinds of solutes.
Depression in the freezing point can be defined as a colligative property that is proportional to the molality of the solution.
As liquid water gets colder and colder, the motions of water molecules become slower and slower. When salt is added to water, the saltwater solution is composed of both water molecules and dissolved salt ions.
As a result, salt ions can easily replace some of the water molecules. Saltwater freezes more slowly than pure water due to many of the water molecules would be "crashing" into the ice's surface in pure water and are replaced by salt ions.
Therefore, the salt water will freeze at a lower temperature than the pure water.
Learn more about freezing point depression, here:
brainly.com/question/30093051
#SPJ2