Are these correct?? Help please

Answer:

Calculate the rate of decay constant for U-238 if its half-life is 4.468 × 109 years. Answer: If the problem is referring to the half-life, then the ratio of = 0.5 because half of the original sample has already undergone decay.

Explanation:

Answer:

D

Explanation:

ahh i think,

AHH JUST LET ME SEND ITTT

Answer:

its one type of matter becomes another type of matter

Explanation:

it was that for a p e x

Answer: Proteins are known as biomolecules and biomolecules are made of the elements Carbon, Hydrogen, Nitrogen, and Oxygen and the monomers of proteins are known as amino acids.

Answer: Decrease

Explanation: The downward slope causes the momentum to decrease in speed rather than increase from an higher point.

Answer:

Protons and neutrons

Explanation:

The particles to forms the nucleus of an atom are the protons and neutrons of the atoms.

These materials are located in the tiny nucleus and contributes the most mass of the atom.

Answer:

For CH3Br, there are a total of 14 valence electrons. Hydrogen always goes on the outside, and since Carbon is less electronegative than Bromine, we'll put the Carbon in the center and the Bromine on top. We have 14 valence electrons for the CH3Br Lewis structure. Put two between atoms to form chemical bonds.

Explanation:

Answer:

λ = 4.2x10^-13 m

Explanation:

c = λν

c is speed of light 3x10^8 m/s

λ is wavelength

ν is frequency

3.10^8 = λ . 7.13 × 10^20

λ = 4.2x10^-13 m

Answer:

Electromagnets are only functional when electricity is passing through them. In other words, they only create a magnetic field when there is an electric current flowing.

A power source like a battery is therefore necessary to supply the electric current necessary for the magnet to work however, it will not work unless the circuit is closed as electricity cannot not flow in an open circuit because current needs to be able to flow from one end of a power source to the other end.

Explanation:

ha hot dog hamburger hamburger ng baboy hahaha bomba girl home baboy

Answer:

2.67 moles of cesium carbonate (Cs2CO3).

Explanation:

We'll begin by writing the equation for the reaction. This is illustrated below:

Cs + Fe2(CO3)3 —> Cs2CO3 + Fe

The above equation can be balance as follow:

There are 2 atoms of Fe on the left side and 1 atom on the right side. It can be balance by putting 2 in front of Fe as shown below:

Cs + Fe2(CO3)3 —> Cs2CO3 + 2Fe

There are 3 atoms of C on the left side and 1 atom on the right side. It can be balance by 3 in front of Cs2CO3 as shown below:

Cs + Fe2(CO3)3 —> 3Cs2CO3 + 2Fe

There are 6 atoms of Cs on the right side and 1 atom on the left. It can be balance by putting 6 in front of Cs as shown below:

6Cs + Fe2(CO3)3 —> 3Cs2CO3 + 2Fe

Thus, the equation is balanced.

From the balanced equation above,

6 moles of Cs reacted with 1 mole of Fe2(CO3)3 to produce 3 moles of Cs2CO3.

Finally, we shall determine the moles of cesium carbonate (Cs2CO3) produced by the reaction of 5.34 moles of cesium (Cs). This can be obtained as follow:

From the balanced equation above,

6 moles of Cs reacted to produce 3 moles of Cs2CO3.

Therefore,

5.34 moles of Cs will react to produce = (5.34 × 3)/6 = 2.67 moles of Cs2CO3.

Thus, 2.67 moles of cesium carbonate (Cs2CO3) were produced from the reaction.

presence of heat can change solid tu liquid

and liquid to gas

Answer:

1/2

Explanation:

According to this question, the gene coding for fur color in rabbits contains two alleles viz: alelle for brown fur ( B) is dominant, while the allele for black fur ( b) is recessive. This means that an heterozygous rabbit (Bb) will have brown fur.

Based on the question, one rabbit has the dominant allele for brown fur and the recessive allele for black fur i.e genotype Bb, another rabbit has two recessive alleles i.e. genotype bb. If these two rabbits cross i.e. Bb × bb, the proportion of the offsprings produces will have Bb, Bb, bb and bb genotype.

Bb is dominant, hence, 1/2 of the offsprings will be brown furred.

one species of rabbit, . the two rabbits have offspring, what are the

Answer:

the outer core

Answer:

The outer core

Answer: b

explanation: i had the question on a test and got it right.

Answer:

19. Physical

20. Physical

21. Chemical

22. Physical

23. Chemical

24. Chemical

25. Physical

Explanation:

Answer:

- Oxido de magnesio

Explanation:

Mg → magnesio

O → oxígeno

La unión del oxígeno (no metal) con un metal, forma el determinado óxido que se nombra como óxido de .... y el no metal.

En este caso, podemos deducir que el contenido del frasco es de óxido de magnesio, aunque viendo que hay un sólo átomo de oxígeno podemos llamarlo como monóxido de magnesio, similar al CO (monóxido de carbono).

A partir de que el magnesio sólido entre en contacto con el aire, se produce MgO de acuerdo a la siguiente reacción:

2Mg  +  O₂ →  2MgO

Answer:

Ca, Mg, Zn, Cu

Explanation:

Refer to the Reactivity Series where each metal is more reactive than others.

Answer:

Methane

Explanation:

It is methane because, it comes from natural sources.

Answer:

wind and water erosion

Answer:

C is the answer

Answer:

body-centered cubic

Explanation:

:D

Answer:

An endothermic process is any process with an increase in the enthalpy H (or internal energy U) of the system. In such a process, a closed system usually absorbs thermal energy from its surroundings, which is heat transfer into the system.

Answer:

The attractive or repulsive interaction between any two charged objects is an electric force

Explanation:

that's the definition

Explanation:

Because the panthers live in the southeastern region of the United states they have increased in population in that region. They have been able to gain more food and have adapted more to there environments. Which allows to increase and reproduce more. That is why the Panthers in the southeastern United states have increased In population.     I hope this works for you and that it helps. I don't mind helping someone who has a question! From, me.

A population of panthers lives in the southeastern United States. Over 50 years, the size of the panther population in the region increased. More panthers were born than died explains the increase in the size of the panther population.

The jaguar, also known as the panther, tigre, or onza, is the world's largest and most powerful cat. Human activities endanger this cat, as they do the Florida panther (Puma concolor).

Because the anteater population will have fewer energy storage molecules available due to the smaller ant population, the anteater population will reproduce less.

Panthers can be found in the southeastern United States. The region's panther population has grown over the last 50 years. Because no animal eats panthers, the panther population is always growing.

Thus, More panthers were born than died explains the increase in the size of the panther population.

To learn  more about the panther, follow the link:

https://brainly.com/question/28060154

#SPJ6

Answer:

Devin's problem can be solved by exploiting the activity series of metals.

Explanation:

This determines what metals are more reactive and would be readily displaced in a reaction.

Seeing as they are both metals scraps of similar sizes, filtration isn't a solution.  But since Copper is lower on the activity series than Aluminium, adding an acidic solution (say tetraoxosulphate VI solution) to the mixture, would have aluminium in solution and Cu as residue which can then be filtered off.

I hope this was helpful.

Hey there!:

Mass = 17.92 g

Volume = 2.00 mL

Density =  ??

Therefore:

D = m / V

D = 17.92 / 2.00

D = 8.96 g/mL

Hope this helps!

The density of an object is obtained as the ratio of mass of an object to its volume.

In science, density is defined as mass per unit volume. The volume of an object is the same as the volume of water displaced by the object.

Since the volume of water rose by 2.00 mL, then the volume of copper is 2.00 mL.

The density is now; mass/volume

Mass = 17.92 g

Density = 17.92 g/2.00 mL

= 8.96 g/ml

Learn more; https://brainly.com/question/24386693

Answer:

"Earth-centered," or "geocentric" Ptolemy thought that all celestial objects — including the planets, Sun, Moon, and stars — orbited Earth. Earth, in the center of the universe, did not move at all.

Explanation:

Answer:

Geocentric

Explanation:

Its the belief that earth was the center of the solar system instead of the sun

Answer: this is not my own words :)

Learn how factors, such as exposure to the atmosphere, the composition of rock and climate affect the rate of weathering. Weathering is the mechanical or chemical process by which rocks are broken down. The weathering that happens to rocks can be understood by relating it to the digestion of a chocolate chip cookie

One of the factors that affects the rate of weathering is exposure to the atmosphere. ... Another factor that affects the rate of weathering is the composition of rock. Rocks are composed of minerals, which are solid substances found within rocks that have their own distinct chemical composition.

Answer:selenium

Explanation:

Answer: Nether

Explanation: Because if you have one pound of Calcium and one pound of selenium there both the same weight