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Answer:

While calculating the surface area of an object, the unit of measurement becomes cm2

Explanation:

Answer:

Protons and neutrons

Answer:

Protons and Netrons

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Answer:

-1300

Explanation:

Answer:

-1300

Explanation:

trust

Answer:

blood sample of each others

Answer: C. Squamous

Explanation:

I got it right on my test...lol

The type of epithelial cells that would be found in an area of the body where diffusion of nutrients needs to occur is squamous.

In conclusion, squamous can be found on the surface of the skin.

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Answer:

30 atoms

Explanation:

2Ni(H₃O₄)₂

There are two nickel, twelve hydrogen and sixteen oxygen atoms are present in given formula.

The given formula is actually having two moles of Ni(H₃O₄)₂.

Thus in two mole total number of atoms are = 2+12+16 =30 atoms

In one mole there are one nickel atom, six hydrogen atom and eight oxygen atoms are present.

Thus in one one mole total number of atoms are = 1+6+8 =15 atoms

However this compound does not exist.

Answer:

Explanation:

1,2,1

Answer:

here's the answer

Explanation:

Answer:it's the third one

Explanation:

Answer:

45

Explanation:

[tex]m_1[/tex] = First sample mass of water = [tex]75\ \text{g}[/tex]

[tex]\Delta T_1[/tex] = Change in temperature of the first sample of water = [tex]25-T[/tex]

[tex]m_2[/tex] = First sample mass of water = [tex]100\ \text{g}[/tex]

[tex]\Delta T_1[/tex] = Change in temperature of the first sample of water = [tex]T-60[/tex]

[tex]T[/tex] = Final temperature of the mixture

[tex]c[/tex] = Specific heat of water

Heat lost by water will be equal to the heat gained so we get

[tex]m_1c\Delta T_1=m_2c\Delta T_2\\\Rightarrow 75(25-T)=100(T-60)\\\Rightarrow 0.75(25-T)=T-60\\\Rightarrow 18.75-0.75T=T-60\\\Rightarrow 18.75+60=T+0.75T\\\Rightarrow 78.75=1.75T\\\Rightarrow T=\dfrac{78.75}{1.75}\\\Rightarrow T=45\ ^{\circ}\text{C}[/tex]

The final temperature of the water is 45.

Answer:

Planetary geologists study rocky planets by comparing them to Earth.

Explanation:

A planetary geologist is someone who studies how other planets form and evolve over time. Planetary geologists work in the field, laboratory, and -indirectly- in outer space through imagery and other data returned by spacecraft.

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Answer:

Trilobite fossils are found worldwide, with many thousands of known species. ... Because of their diversity and an easily fossilized exoskeleton, they left an extensive fossil record with some 17,000 known species spanning Paleozoic time.

Let me know if this help

Explanation:

Depending on the area and the movement of the plates, the fossils would be kind of close to each other. Maybe about a couple feet at the farthest in one area, almost everywhere.

Answer:

chlorie (Cl)

Explanation:

aluminum is a metal.

potassium is a metal.

calcium is a metal.

But chlorine is a nonmetal.

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Answer:

Electrical Energy

Explanation:

Batteries store chemical energy and change it to electrical energy.

Answer:

Electrical energy

Explanation:

Answer:

burgers

Explanation:

Chemical reaction or chemical change is characterized by gas  evolution, precipitate formation and  the color changes.

Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.

There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical changes:

1) inorganic changes

2)organic changes

3) biochemical changes

During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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Answer:

CaBr2

Explanation:

There is one calcium atom and 2 Bromine atoms.

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Answer:

There are more than a hundred different atoms, but each element contains only one kind of atom.

Atoms are what make one element different from another.

So what makes one atom different from another?

The Greeks thought atoms could not be divided into anything smaller but they were wrong! Every atom can be divided into three different components - protons, neutrons and electrons.

The nucleus, or centre of an atom, is made of protons, (which have a positive electrical charge) and neutrons, which are neutral (in other words, they have no charge).

Electrons, which have a negative charge, move around the centre of the atom.

Normally, the number of electrons is equal to the number of protons, which makes atoms electrically neutral.

The number of protons in an atom is the defining feature of an atom. It's what makes one element different from another. The number of protons in an atom is called its atomic number. Oxygen atoms have 8 protons. So the atomic number of oxygen is 8.

All the elements in the universe are arranged according to their atomic number in the periodic table.

Atomic mass

If you add together the number of protons (or atomic number) and the number of neutrons in the nucleus of an atom, you can calculate the mass of the atom. Helium (He), atomic number two, has two protons and two neutrons. So the mass number for Helium is 4.

Isotopes

Atoms with the same number of protons but different numbers of neutrons are called isotopes. Uranium-238 and uranium -235 are two different isotopes of uranium. Uranium- 238 has a mass number of 238. Uranium-235 has a mass number of 235. So uranium-238 has more neutrons than uranium-235. But they are still both atoms of uranium because they have the same number of protons.

Answer:

3 things

Explanation:

something to keep it insulated and stay warm, a container, a lid that can open and close.

Answer:

What 3 factors influence the amount of thermal energy in an object, and how do they each affect it? Mass, temperature, and phase. More mass, more Thermal Energy. Higher temperature, more Thermal Energy.

ASAP=abbreviation. As soon as possible. 'fill in your form and send it to us ASAP' More example sentences.

Explanation:

Element sodium (Na) has an atomic number of 11

mass number = 23

proton = 11

electron = 11

Neutron = mass number - atomic number

= 23 - 11

= 12

There are five valence electrons in nitrogen atom and they always participate in covalent bond formation.

Atoms participate in;

The type of bonding that atoms of elements are involved in depends on the number of electrons in the valence shell of each of the bonding atoms.

Recall the elements that have very few electrons in their valence shell(metals) often form ionic bonds with other elements whose valence shell are less than the stable octet by one or two electrons.

On the other hand, nonmetals having more electrons on their valence shell often share electrons in a covalent bond.

Nitrogen is a nonmetal that has five valence electrons. Nitrogen often shares three of these electrons with atoms of other elements in a covalent bond.

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Answer:

physical

Explanation:

it is physical because you add another chemical to the sodium

Answer:

Option A is correct = 157.2 amu

Explanation:

Given data:

Percentage abundance of Zr-156 = 84%

Atomic mass of Zr-156 = 156.8 amu

Percentage abundance of Zr-160 = 16%

Atomic mass of Zr-160 = 159.4 amu

Average atomic of Zr on Mars = ?

Solution:

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

Average atomic mass = (84×156.8)+(16×159.4) /100

Average atomic mass =  13171.2 + 2550.4  / 100

Average atomic mass  = 15721.6 / 100

Average atomic mass = 157.2 amu.

Answer:

A.) Speed up

Explanation:

Heat is directly proportional to kinetic energy which happens when the particles are moving very quickly. This means that more speed = more heat.

Answer:

A

Explanation:

With an increase in temperature, the particles move faster as they gain kinetic energy, resulting in increased collision rates and an increased rate of diffusion. ... With an increase in temperature, the particles gain kinetic energy and vibrate faster and more strongly.

Answer:

Explanation:

The percentage error of a certain measurement can be found by using the formula

[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]

From the question

actual density = 8.96 g/mL

error = 8.96 - 8.86 = 0.1

We have

[tex]p(\%) = \frac{0.1}{8.96} \times 100 \\ = 1.1160714...[/tex]

We have the final answer as

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Answer:

Bone char is a porous, black, granular material produced by charring animal bones. Its composition varies depending on how it is made; however, it consists mainly of tricalcium phosphate 57–80%, calcium carbonate 6–10% and carbon 7–10%. It is primarily used for filtration and decolorisation.

they get closer together

Answer:

d = 11400 kg/m³

Explanation:

The density of lead is 11.4 g/cm³

We need to convert the density in kg/m³ in scientific notation.

We know that,

1 kg = 1000 g

1 cm = (1/100) m = 0.01 m

Density,

[tex]d=11.4\ \dfrac{g}{cm^3}\\\\=11.4\times \dfrac{(\dfrac{1}{1000})\ kg}{(0.01\ m)^3}\\\\=11400\ kg/m^3[/tex]

So, the density of the lead is 11400 kg/m³.