can someone help me please i’ll give brainly

Answer:

An unstable form of a chemical element that releases radiation as it breaks down and becomes more stable. Radioisotopes may occur in nature or be made in a laboratory. In medicine, they are used in imaging tests and in treatment.

Hope I could help!

Answer:

(RAY-dee-oh-I-suh-tope) An unstable form of a chemical element that releases radiation as it breaks down and becomes more stable. Radioisotopes may occur in nature or be made in a laboratory. In medicine, they are used in imaging tests and in treatment. Also called radionuclide.

Explanation:

Answer:

C. an entirely new substance with new properties forms as a result of the change

Answer:

. an entirely new substance with new properties forms as a result of the change

Explanation:

Answer:

evaporation and distilation

Explanation:

Answer:

the answer is 180 j/k i think

Explanation:

Answer: its 79 for the first part and 180 on the second part

Explanation:

Answer:

sugar dissolving in water

Explanation:

at the end mixing 2 substances and not get a new substance is not a chemical change. the sugar is still sugar even when its in water.

Answer:

3)N2, H2, Cl2........

Answer:

Rutherford predicted that an atom has a dense core called a nucleus.

Explanation:

Ernest Rutherford was a physicist who is known as the father of nuclear physics. He suggested an atomic model known as the Rutherford model. According to him, the atom consists of a tiny, dense, positively charged core called a nucleus and negatively charged particles called electrons that circulate around it The nucleus consists of positively charged particles called protons and neutral particles called neutrons.

Volume in liters of Carbon dioxide : 0.672

Reaction(combustion of butane-C₄H₁₀)

2C₄H₁₀+13O₂⇒8CO₂+10H₂O

mol butane (MW=58,12 g/mol) :

[tex]\tt \dfrac{0.85}{58,12}=0.015[/tex]

mol CO₂ : mol C₄H₁₀ = 8 : 4, so mol CO₂ :

[tex]\tt \dfrac{8}{4}\times 0.015=0.03[/tex]

At STP, 1 mol = 22.4 L, so volume CO₂ :

[tex]\tt 0.03\times 22.4~L=0.672~L[/tex]

Answer:

DNA

Explanation:

DNA

Mendel's early studies led scientist to discover what in 1953 is DNA

Answer:

DNA

Explanation:

luv you <3

Answer:

oh my god i have learnt about this

Explanation:

Answer:

Point A

Explanation:

I dont know why but it was right on the test.

Answer:

The equation is already balanced.

The type of chemical reaction is oxidation

Explanation:

Oxidation is the addition of oxygen to a substance

Answer:

This type of reaction is a synthesis reaction

Explanation:

Answer:

a theory for the hydrogen atom based on quantum theory that energy is transferred only in certain well defined quantities. Electrons should move around the nucleus but only in prescribed orbits.

Explanation:

Answer/Explanation:

A higher temperature causes the molecules in a substance to move faster in a chemical change. This increased speed allows the particles to have enough force for a chemical change and it also increases the amount of times a particle hits another this makes it faster for it to combine.

Answer:

Iron age farm

Explanation:

edge 2020

Answer:

D

Explanation:

Got it right on edge

The answer is True because they are formed of deposition.

Answer:

clay

Explanation:

its more than the rest

Answer:

since it is in grp 1, it will react with water like all other metals.

Answer:

Rubidium, as a Group 1 metal, will have a strong reaction with the water and form hydrogen. The reaction is so strong it might even be explosive, hence the danger of putting it in water.

Explanation:

Hope this helped!

Answer:

E = 3.77×10⁻¹⁹ J

Explanation:

Given data:

Wavelength of absorption line = 527 nm (527×10⁻⁹m)

Energy of absorption line = ?

Solution:

Formula:

E = hc/λ

h = planck's constant = 6.63×10⁻³⁴ Js

c = speed of wave = 3×10⁸ m/s

by putting values,

E = 6.63×10⁻³⁴ Js ×  3×10⁸ m/s / 527×10⁻⁹m

E = 19.89×10⁻²⁶ Jm /527×10⁻⁹m

E = 0.0377×10⁻¹⁷ J

E = 3.77×10⁻¹⁹ J

Answer:

D

Explanation:

a p e x

Explanation:

Atoms of non-metal usually gain electrons when

they react with other elements.

Eg -

Therefore,

Option A is correct ✔

Answer:

B. CO2 + H2O

Explanation:

Propane is an hydrocarbon as it contains only v=carbon and hydrogen atoms.

Whenever an hydrocarbon reacts with oxygen or undergoes a combustion reaction, two products are always formed only,

These two products are;

Carbon dioxide (CO2) and water (H2O)

This means the correct option is option B.

Answer:

a tropical strom is when theres a lot of rain and it almost developed into a hurricane and a thunderstorm is rain with lightning and thunder but not that bad like a tropical storm and a tornado is when there is a huge gust of win that is formed in a circle like shape and could cause damage to homes

Explanation:

The translation of the question is

Commercial solutions of HCl (MP = 36.5 g / mol) are typically 39.0% W / W of this acid in water. Determine the molality of the HCl solution if its density is equal to 1.20 g / ml.

Answer:

Molality is 17.51 molal

Explanation:

We are given 39% w/w of HCl, this means for every 100g of this solution we have 39g of HCl in it.

to ease the calculation we assume we have 1L(1000ml) of this solution is present.

Density = mass /volume

1.20 = mass/1000

mass = 1200 g of solution

and we are given that 39% of this solution is will contain HCl

so

1200 * 39/100 = 468g of HCl present

no of moles of HCl = 468/36.5 = 12.82moles

mass of solution = mass of water + mass of acid

mass of water = mass of solution - mass of acid

Mass of water = 1200 - 468 = 732g of water

Molality = moles /masss of water in kg

             = 12.82 *1000/732  =17.51molal

Explanation:

here,

Mass (m)= 32 g =0.32 kg

Density(d)= 17 g/ml

volume (v)=?

we know that,

d=m/v

17=0.32/v

v= 0.32/17

v=0.018

Answer:

[tex]\boxed {\boxed {\sf v \approx 1.88 \ mL}}[/tex]

Explanation:

The density formula is:

[tex]d=\frac{m}{v}[/tex]

If we rearrange the formula for volume, the result is:

[tex]v=\frac{m}{d}[/tex]

The mass of the object is 32 grams. The density is 17 grams per milliliter.

[tex]m= 32 \ g\\d= 17 \ g/mL[/tex]

Substitute the values into the formula.

[tex]v=\frac{32 \ g}{17 \ g/mL}[/tex]

Divide. Note that the grams, or g, will cancel each other out.

[tex]v=\frac{32 }{17 \ mL}[/tex]

[tex]v=1.88235294 \ mL[/tex]

Let's round to the nearest hundredth to make the answer more concise.

The 2 in the thousandth place tells us to leave the hundredth place as is.

[tex]v \approx 1.88 \ mL[/tex]

The volume of the object is about 1.88 milliliters.

Answer:

2.75

Explanation:

For every ride taken the money spent goes up by $2.75.

Answer:

The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field

Answer:

False.

Explanation:

Kinetic energy represents the energy the car has and is using right now. So, if the car was fast, then it would have a lot of kinetic energy. A slow car has a low amount of kinetic energy.

Answer:

6CO2 + 6H20 ----> C6H12O6 + 6O2

Explanation:

(Carbon Dioxide) + (Water) ------> (Glucose) + (Oxygen)

Answer:

A

Explanation:

CO2= carbon dioxide

H2O= water

C6H12O6=glucose

O2=oxygen