Help me with my Science assignment please its graded.​

Answer:

Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass.

Answer: Nickel (II)Phostate

Answer: Nickel(II) Phosphate

Explanation:

Answer:

Ver explicacion

Explanation:

Sabemos que tanto el ácido bórico como el amoníaco contienen enlaces de hidrógeno intermoleculares.

Sin embargo, la disolución del ácido bórico en agua es endotérmica. Esto explica la dependencia de la temperatura de la reacción. Las reacciones de avance endotérmico no se favorecen a baja temperatura. Por tanto, el ácido bórico no es soluble a baja temperatura.

Sin embargo, la disolución del amoniaco en agua es exotérmica.

Answer:

An ion is a charged atom or molecule.  Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions. Positive ions are called cations and negatively charged ions are called anions.

Answer: A Nucleus is present in both the plant and animal cell

Explanation:

Answer:

Electron repulsion

Explanation:

Answer:

Subscripts

Explanation:

Example:

H2O

2 is the subscript and does not change  

Answer:

Name Strontium

Atomic Mass 87.62 atomic mass units

Number of Protons 38

Number of Neutrons 50

Number of Electrons 38

Flammability = A. How easily a substance can be set on fire.

Toxicity = D. The ability of a substance to damage or harm an organism.

Malleability = C. The ability of a solid to bend or be hammered into a new shape.

Heat of Combustion = B. How much heat is given off when a substance is burned.

A substance's heat of combustion, also known as its calorific value or energy value, can be defined as the amount of heat liberated when a given amount of the substance is burned.

Combustion heats are typically determined by burning a known amount of the material in a bomb calorimeter with an excess of oxygen. The heat of combustion can be calculated by measuring the temperature change.

The energy released when a substance X completely burns with an excess of oxygen under standard conditions (25°C and 1 bar). It is the inverse of the enthalpy change for the combustion reaction in thermodynamic terms.

Thus,Heat of Combustion is how much heat is given off when a substance is burned.

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Answer:

the answer is false :)

Explanation:

The given statement is true. Plant cell have a cell wall instead of a cell membrane.

Cell is the basic unit of life. There are two kinds of cell such as plant cell and animal cell. Plant cell have cell wall. Animal cell have do not have cell wall.

Cell wall is only present in some bacteria and plant cell. The cell wall of plant cell is made up of cellulose.

The cell wall is protective layer. It protects the plants from surrounding environment.

Therefore, The given statement is true. Plant cell have a cell wall instead of a cell membrane.

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Hydrogen is the smallest chemical element because it consists of only one proton in its nucleus. Its symbol is H, and its atomic number is 1 .It has an average atomic weight of 1.0079 amu, making it the lightest element.

a.1.00784 u

b.Atomic-36

Kr

Krypton

Atomic Weight. 83.80

That means that there must be a balance between the positively charged protons and the negatively charged electrons. Atoms must have equal numbers of protons and electrons. In our example, an atom of krypton must contain 36 electrons since it contains 36 protons. Electrons are arranged around atoms in a special way.

Answer:

They're never found as individual elements in nature because they are so reactive.

Explanation:

Halogens are a highly reactive group of elements. They are usually found combined in nature.

Answer:

ME

Explanation:

Answer:

I play a lot and am the imposter a lot

Answer:

Yes Nitrogen has 7 Neutrons

Explanation:

Answer:D. Compound.

Explanation:

A compound is defined as a pure substance: formed when two or more elements chemically combine to form bonds between their atoms.

Answer:

For Each Of The Reactions, Calculate The Mass (in Grams) Of The Product ... Assume That There Is More Than Enough Of The Other Reactant. ... grams) of the product formed when 3.09g of the underlined reactant completely reacts.

Explanation:

Answer:

Lithium

Explanation:

The element with electronic configuration of 2, 1 is helium.

In the electronic configuration, we are able to know that the total number of electrons the atom contains is 3. Also, the element has one electron in the outer most shell.

Elements with one valence electrons are the alkali metals.

Therefore, this configuration clearly matches Lithium.

Answer:

I'm not 100% sure but i would guess global warming if anything

Explanation:

please do not put this as your answer if your not sure if its correct

Answer: The mass of the nucleus is less than the mass of the 8 protons and 8 neutrons.

Explanation:

Answer:

the most basic way i can put it is..

Explanation:

the planets rotate around the sun is because the gravity of the sun keeps them in their orbits. if the sun wasnt there, the earth would literally just travel in a straight line. but the gravity of the sun alters its course, making it travel around the sun.

Answer:

Periodic Properties of the Elements

Atomic Radius.

Ionization Energy (ionization potential)

Electron Affinity.

Electronegativity.

Metallic Character.

Other Trends.

Redox Potentials. Oxidation Potential. Reduction Potential.

Uses in knowing the Periodic Properties of Elements

Explanation:

Answer:

6.95 x 10²³ molecules/particles

Explanation:

First we need to find the total Empirical Mass. We can find this by adding each element's mass together.

Al = 26.982,

O = 15.999

H = 1.008

26.982 + 3(15.999) + 3(1.008) = 78.003.

Now we divide by the mass given (90 grams).

90/78.003 = 1.153801777.

We then take that number and multiply it by avogadro's number (6.022 x 10²³)

1.153801777 x avogadro's number = 6.95 x 10²³

Answer:

the answer is homogeneous mixture

Answer:

C, because it will then begin to become a solid but it will still be water but frozen so more like ice then.

Answer: Francesco Redis Experiment part 1 : The maggots were not observed in setup B and setup C because the jars were covered.

part 2 : He discovered that maggots appeared on the meat in the control jar, the jar left open. No maggots appeared in the jar covered with gauze.

Pasteur Experiment

part 1:In the pastures Experiment the microorganisms come from the air.

part 2:Louis Pasteur's pasteurization experiment illustrates the fact that the spoilage of liquid was caused by particles in the air rather than the air itself.

Explanation:

Answer: proton

Explanation:

They are what give an atom it’s identity