examine the graph to determine half life of strontium -90

Answer:

Beryllium-8 (8Be, Be-8) is a radionuclide with 4 neutrons and 4 protons. It is an unbound resonance and nominally an isotope of beryllium. It decays into two alpha particles with a half-life on the order of 10−16 seconds; this has important ramifications in stellar nucleosynthesis as it creates a bottleneck in the creation of heavier chemical elements. The properties of 8Be have also led to speculation on the fine tuning of the Universe, and theoretical investigations on cosmological evolution had 8Be been stable.

Explanation:

Gas has the most spread out particles.

Density is the degree of the heaviness of a particular substance.

Density is said to be the characteristic property of a pure substance because the density of a pure substance is constant and fixed

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Answer:

Because all machines lose input work to friction, one way to improve the efficiency of a machine is by reducing friction. Oil is used to reduce friction between the moving parts of car engines. The use of oil makes engines more efficient. Another machine that loses input work is a bicycle.

Explanation:

Hope this helps.

The factor which increases as the efficiency of a machine increases is: work output.

Efficiency can be defined as a ratio of work (energy) output to work (energy) input.

Mathematically, the efficiency of a machine is given by the formula:

[tex]Efficiency = \frac{W_O}{W_I} \times 100[/tex]

Where:

Work can be defined as the amount of energy required to move an object from one point to another.

Hence, the work done by a machine is the product of the perpendicular force acting on the machine and the distance it covers or travels.

Ideally, the work output of a machine is highly dependent on its efficiency and as such, it is a factor which increases as the efficiency of a machine increases

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Answer:

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Answer:

not all mixture have solutes

Answer:because the chemical formula is vital to the equation it tells you what creates the chemical and whats in it you can change the exponents but not the formula itself

Explanation:

Answer:

3.6 atm

Explanation:

10. A balloon is blown up to a volume of 18 L at a pressure of 1.0 atm and

298 K. What would the pressure inside the balloon be when its volume

becomes 4.0 L and its temperature is 239 K?*

PV/T = P'V'/T'

(18 X 1)/298 =(P' X 4)/239

so

P' = (18 X 239)/(298 X 4)= 3.6 atm

P'=(18 X 239)/(298 x 4)  =

Answer:

1. Mixtures

2. Different

3. Manipulations

4. Magnet

5. Filtration

6. Liquid

7. Evaporation

Answer:  Electrons

Explanation:

A chemical reaction usually only affects elctrons. A chemical reaction usually results in the electrons being transferred or shared. When sodium and fluorine react to produce sodium fluoride, a sodium electron is transferred to the fluorine to produce ionic bonds. This ionic bond exists between the sodium cation and fluoride (fluorine) anion.

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A. Chloride ions (CI)

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Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 15 g

volume = 3 mL

We have

[tex]density = \frac{15}{3} = 5 \\ [/tex]

We have the final answer as

Hope this helps you.

Explanation:

Heavier particles will move more slowly and so will have a slower rate of diffusion. Smaller particles on the other hand will diffuse faster because they can move faster.

Explanation:

smaller particles diffuse faster

larger particles diffuse slower

Answer:

798.5 grams

Explanation:

Answer:

147.28 cm³

Explanation:

Density = m/V

1.29 g = 190 g/cm3/V

V = 190 g/cm³ : 1.29 g

V = 147.28 cm³

the answer is d electronic balance

Plasma is one of the four common states of matter. A plasma is an electrically charged gas. In a plasma, some electrons have been stripped away from their atoms.

Explanation:

Plasma is one of the states of matter that are electrons stripped from the nucleus

Answer:

Explanation:

A: Since the Pea plant matured very quickly he was able to identify how the dominant and recessive genes worked.

Answer:

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Explanation:

Answer:

Elements in the same period have the same (number of electron shells)

Answer:

14 ft 7 inches

step-by-step explanation:

since each model inch corresponds to 25 real inches, 7 model inches will correspond to

7×25" = 175"

at 12" per foot, that is 14 feet, 7 inches.

Explanation:

Answer:

Valence Shell

Explanation:

Some atoms have nearly eight electrons in their valence shell and can gain additional valence electrons until they have an octet. When these atoms gain electrons, they acquire a negative charge because they now possess more electrons than protons.

Answer:

New substances formed when breaking of bonds take place and new bonds get formed which results in formation of new products. That breaking of bond is a chemical change because in such a process composition of substance gets changed and forms a new substance.

Answer:

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Answer:

law of independent assortment

Answer: A, Carbon Dioxide

Explanation:

A. Soda water, like other carbonated beverages, contains carbon dioxide that has dissolved under pressure. When the pressure is released by opening the soda container, the liquid cannot hold as much carbon dioxide, so the excess bubbles out of the solution.

Answer:

A. carbon dioxide

Explanation:

the answer is A