What is the correct way to write 1,550,000,000 in scientific notation

Sample A has a mass of 40g and a volume of 10cm^3. Sample B has a volume of 15cm^3 and a mass of 45g. Which sample has a greater

lutik1710 [3]

The Answer Is Sample A

Density -

$density = \frac{mass}{volume}$

Input The Formula For Both Equations To Find Density.

Sample A -

$d = \frac{40}{10}$

$d = 4$

Sample B -

$d = \frac{45}{15}$

$d = 3$

3 0

3 years ago

The regulation of mineral ions in the cellular fluids of biological systems is performed by ion pumps that selectively transport

siniylev [52]

Answer:

The smallest ion is : Mg 2+

Increasing Order of size :

Mg2+ < Na+ < F- < O2-

Explanation:

Isoelectronic Species : Species having same number of electrons .

$Z_{eff}$ = Effective attraction of the nucleus felt by the outer shell electrons.

The size of the atom is decided by :

Its atomic number (number of proton)

the effective nuclear charge.

As the positive charge increases the size of the ion decreases.

As the negative charge increases the size of ion also increases.

Negative charged ions : F- , O2-

Negative charge are formed when electrons are added to the atoms.

When Negative ion is formed :

Number of proton remain same

Number of electron get increased

Hence it becomes difficult for the proton in the nucleus to attract the electrons.

Electron - electron Repulsion increases

$Z_{eff}$ = decreases

Size increase

Positive charged ions : Na+ , Mg2+

Positive charge are formed when electrons are removed from the atoms.

When Positive ion is formed :

Number of proton remain same

Number of electron get reduced

Hence more attraction of the nucleus is felt by the outer electron.

Electron - electron Repulsion Decreased

$Z_{eff}$ = increases

Size decreases

8 0

4 years ago

The dessert can be harsh environment with extreme heat during the day and cold during the night also there is very little rainfa

Sphinxa [80]

Answer:

True

Explanation:

The desert refers to a region of arid land which is characterized by extreme temperatures, extreme dryness, low amount of precipitation and generally harsh living conditions. Because of these harsh conditions, they have been tagged with various names ranging from 'Death Valley' to 'the place from where there is no return' etc.

Every desert is made up of 2 components: the biotic (living) component and the abiotic (non-living) component. The biotic (living) component consists of the plants and animals that have adapted to these harsh living conditions e.g. Cactus or Cacti, Holly plants, Camels, Lizards, Snakes etc. The abiotic (non-living) component consists of climate (subtropical deserts which are extremely cold or temperate deserts which are extremely hot), location, precipitation/rainfall

8 0

3 years ago

Element z reacts with bromine to form an ionic compound zbr2

slamgirl [31]

Explanation:

Physical properties of ZBr₂

The compound is an ionic substance. Therefore it will have properties of ionic compounds. Some of these properties are:

it is a hard solid usually with high melting points or a liquid with high boiling points.
Soluble in water and insoluble in non-polar solvents.
It can conduct electricity in aqueous solutions or in molten form.
it will undergo a fast reaction.

Z is a metal

To form ionic compound, a metal will combine with a non-metal. Bromine is a non-metal and it is expected that Z will be a metal. This is because ionic bonds involves transfer of electron from one specie to the other. Metals are usually the donor and non-metals are the receptor. This is how ionic bond forms. The electrostatic attraction resulting from the ions produced the ionic bond.

Formula of the oxide

ZO

Z 0

+2 -2

It is obvious that Z has 2 valence electrons. It will lose the two valence electrons to attain stability.

Oxygen requires 2 electrons to resemble Neon. This combination will give a compound ZO.

Learn more:

ionic compounds brainly.com/question/6071838

#learnwithBrainly

5 0

3 years ago

How many protons electrons and neutrons does the following isotopes contain 1H+

kap26 [50]

Answer:

H+ contains 1 proton, 0 neutrons, 0 electrons.

Explanation:

7 0

3 years ago