can someone help and lmk if my answers are correct i don’t think they are please help i’ll give brainliest thank you

Answer:

c. density

hope this helps :)

Explanation:

Answer:

CHEMIcal hiSToRY

Explanation:

Answer:

bacon

Explanation:

nator

Answer:

1.57

Explanation:

nator

Answer:

Melting point as a chemistry concept

The solid begins to go from a solid state to a liquid state — a process called melting. The temperature at which melting occurs is the melting point (mp) of the substance.

Sulfur tetra flouride formula is SF4   so there are 3.07 moles of sulfur ATOMS in there.

The question is incomplete; the complete question is;

In the early 1900s many scientists thought that an atom consisted of a positive substance with negative charges scattered throughout the substance. Then Ernest Rutherford completed an experiment that changed the concept of an atom. His discovery led to the understanding that an atom consists mostly of empty with space with-

Protons orbiting a dense nucleus made of electrons and neutrons

Electrons orbiting a dense nucleus made of protons and neutrons

Neutrons and protons orbiting a cloud of electrons

Electrons and protons orbiting a cloud of neutrons

Answer:

Electrons orbiting a dense nucleus made of protons and neutrons

Explanation:

Rutherford established the nuclear theory of the atom by his famous experiment. In his experiment, alpha particles were used to bombard a thin gold foil and the movement of the particles was observed on a moveable zinc sulphide screen.

It was discovered from the experiment that the atom was mostly made up of empty space. The electrons orbit a dense nucleus comprising of protons and neutrons.

Answer:

The network of nerve cells and fibres that transmits nerve impulses between parts of the body.

Answer:

Answer:

Ions are formed when atoms lose or gain electrons in order to fulfill the octet rule and have full outer valence electron shells.

Explanation:

When they lose electrons, they become positively charged and are named cations. When they gain electrons, they are negatively charged and are named anions.

Answer:

determination or brains

Explanation:

Answer:

Option c) The measurement of how much solute can be dissolved in a liter of solvent.

Explanation:

The concentration of a solution can be defined as the amount of solute in 1 litre of the solvent i.e how much of the solute that can dissolve in a litre of the solvent. Mathematically, it can be written as:

Concentration = mole of solute / Volume of solvent

Thus, the unit for the concentration is mole per litre (mol/L)

From the above illustration, we thus say that the concentration of a solution is a measure of how much solute can be dissolved in a liter of solvent.

Answer: A) Increase the amount of solute.

              C) Decrease the amount of solvent.

Answer:

d

Explanation:

disolving is a chemical like word and if a limestone cave is forming from the acid in the water thats chemical wheathering!

Answer:

Cave formation from the acid in water dissolving limestone

Explanation:

Answerfirst one

Explanation:

Answer:

Carbon - 14

Oxygen - 16

Nitrogen - 15

Sulphur - 16

Explanation:

The question above is related to the "Periodic Table of Elements" which shows the proper arrangement of elements in a table. Every element falls on a group/family within the table. Each group has its own number, and the table has a total of 18 groups (from left to right). They are classified according to similarities in their characteristics. For example, group 1 is composed of alkali metals while group 2 is composed of alkali earth metals.

Answer:

Should be Solute

Explanation:

I looked it up ;)

Answer:

c. Solute

Explanation:

Answer:

pls complete your question

Answer:

In the nucleus.

Explanation:

Answer:

The reactants have more heat energy than the products.

Explanation:

The reactants in an exothermic reaction have higher potential heat energy than the products, this is because they release the energy as heat.

Answer:

just took test is the reactants have more heat

Explanation:

The doctor would form a hypothesis based on your symptoms. If you have a cough for instance, then s/he could hypothesize that you have a cold or flu. From that hypothesis, they would gather data in the form of measuring your vitals and so on. Using that data, they would be able to confirm the hypothesis, or reject it in form of some alternative.

Answer:

Yes it will

An example is ice, when it melts the volume goes up which means it occupies much more space

Answer:

Methane is an odorless, colorless, flammable gas. It is used primarily as fuel to make heat and light. It is also used to manufacture organic chemicals. Methane can be formed by the decay of natural materials and is common in landfills, marshes, septic systems and sewers

Explanation:

Answer:

The mass of oxygen gas is 0.96 g.

Explanation:

Given data:

Mass of oxygen gas = ?

Volume of as = 320 mL (320mL × 1L /1000 mL = 0.32 L)

Temperature of gas = 17 °C

Pressure of gas = 2 atm

Solution:

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will convert the temperature.

17+273 = 290 K

Now we will put the values in formula.

2 atm × 0.32 L = n × 0.0821 atm.L/ mol.K   × 290 K

0.64 atm.L =  n × 23.81 atm.L/ mol.

n = 0.64 atm.L / 23.81 atm.L/ mol.

n = 0.03 mol

Mass of oxygen:

Mass = number of moles × molar mass

Mass = 0.03 mol × 32 g/mol

Mass = 0.96 g

The mass of oxygen gas is 0.96 g.

The mass of oxygen will be "0.96 g".

Given:

Volume,

or,

           = 0.32 L

Temperature,

or,

           = 290 K  

Pressure,

General gas constant,

As we know the formula,

→ [tex]PV = nRT[/tex]

By substituting the values, we get

[tex]2\times 0.32=n\times 0.0821\times 290[/tex]

     [tex]0.64=n\times 23.81[/tex]

         [tex]n = \frac{0.64}{23.81}[/tex]

            [tex]= 0.03 \ mol[/tex]

hence,

→ Mass of oxygen = [tex]Number \ of \ moles\times Molar \ mass[/tex]      

                               = [tex]0.03\times 32[/tex]

                               = [tex]0.96 \ g[/tex]

Thus the above answer is right.

Learn more:

https://brainly.com/question/14049502

Answer:

Physical change is there is a difference in appearance, smell, etc.

Chemical change is there is change in the composition or the rearrangement of the atoms of one or more substances.

Answer:

70

Explanation:

density=mass/volume

therefore mass = density*volume

20*3.5=70

Answer:

0.0199moles

Explanation:

The number of miles of a substance can be calculated using the formula:

Number of moles (n) = Mass (M) / Molar mass (MM)

In this question, the mass of Magnesium element (Mg) = 0.478 g while the atomic mass is 24

Therefore, number of moles of Magnesium is:

Moles = 0.478/24

Moles = 0.01992

Hence, 0.0199 moles of Magnesium are contained in 0.478 g of the element.

Answer:

21.504 liters

Explanation:

Given: 0.960 mol

Volume: ?

Molar Volume at STP = 22.4 liters

0.960 mol × 22.4 L/ 1 mol =

0.960 × 22.4 L = 21.504 L

Answer:

x = 1/100 = 0.01

Explanation:

1/10 = √x

(1/10)² = (√x)²

1/100 = x

or x = 0.01