the closeness of a measurement to its actual value is a measure of its


A. usefulness
B. reproducibility
C. precision
D. accuracy

According to periodic trends, bismuth has the greatest atomic radius.

Answer:

aluminum (solid)

Explanation:

Solids have fixed shape and volume at room temperature.

Matter is defined as any substance that has weight and occupies space. There are three main classes of matter;

  Solids are particles have strong attractive force between them. This confers a fixed shape and volume on them.

 Liquids are mostly fluids that takes up the shape of containers they occupy. The have intermediate strength of attractive forces.

 Gases have weak forces and do not have fixed shape or volume. They take up the shape of any container they are introduced into.

Answer:

Unbalanced

Explanation:

The balanced equation would be:

C3H8 +  5  O2  --->  4  H2O +  3   CO2

Answer:

different forms of genes for a single trait

Explanation:

There are three main forms  of genes  that can exist for a single trait and they are:

A dominant allele is a stronger version of a gene that shows up when at least one copy of it is present in an organism's genetic makeup. It hides the effects of the weaker gene. In a person with two different alleles, the one that is more powerful decides how the person looks or behaves.

Recessive allele: A recessive allele is only expressed when there are two of the same recessive alleles present. It is hidden by a strong gene. The recessive allele can only be seen when a person has two copies of it.

Co-dominant alleles: When co-dominant alleles are together, both are shown. In this situation, neither gene is stronger than the other, and both play a role in what an organism looks like. One example of co-dominance is the ABO blood type system. In this system, both the A and B alleles are of equal importance.

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Answer:

C. The mass of an electron is much less than the mass of a proton or

a neutron.

Explanation:

When we compare the mass of an electron to that of proton or neutron, the mass of an electron is much less than the mass of a proton or a neutron.

Electrons are negatively charged particles in an atom

Protons are positively charged particles

Neutrons do not carry any charges.

We can see that electrons have very small mass and this is why when calculating the mass of an atom, we use the sum of the number of protons and neutrons.

Answer: Mass is both a property of a physical body and a measure of its resistance to ... Inertial mass is the mass of an object measured by its resistance to acceleration. ... back to the fact that we have not really defined what a force is. ... Then we can measure the mass of any other object in the universe ...

Answer:

A. water H2O, everything else is a single element C,Fe&Cu

Explanation:

Answer:

By just counting sigma bond and lone pair in central atom , one can easily find hybridization.

CO2 sp

SO2 sp2

NH3 sp3

BCl3 sp2

Answer:

The acceleration of a moving object can be calculated by dividing the change in velocity by the change in TIME

Explanation:

Took the practice

Answer:

The mercury with volume of 25 cm³ having weight of 340 g.

Explanation:

Given data:

Density of mercury = 13.6 g/cm³

Volume of mercury = 25 cm³

Mass of mercury = ?

Solution:

We will apply density formula.

d = m/v

13.6 g/cm³ = m/ 25 cm³

m = 13.6 g/cm³ × 25 cm³

m = 340 g

The mercury with volume of 25 cm³ having weight of 340 g.

Answer:

Its B. The atoms form a bond with a bond lenth of 75 pm

Answer:

18

Explanation:

An element with 17 protons will always be chlorine. However an element's mass numbers can vary, which means that it can have different numbers of neutrons. So although chlorine has a mass number of 35 which means it has 18 neutrons.

Answer:

C. Biotechnology

Explanation:

In its broadest definition, biotechnology is the application of biological techniques and engineered organisms to make products or modify plants and animals to carry desired traits. This definition also extends to the use of various human cells and other body parts to produce desirable products.

The % lithium by mass in a sample of pure lithium carbonate : 18.79%

Proust states the Comparative Law that compounds are formed from elements with the same Mass Comparison so that compounds have a fixed composition of elements

% Lithium (Li) in Li₂CO₃(lithium carbonate) will remain the same even if the mass amount of Li₂CO₃ changes

Ar of Li = 6.941 g/mol

MW of  Li₂CO₃  = 73.891 g/mol

[tex]\tt \%Li=\dfrac{2.Ar~Li}{MW~Li_2CO_3}\times 100\%\\\\\5Li=\dfrac{2\times 6.941}{73.891} \times 100\%=18.79\%[/tex]

Answer:

A.Ozone

Explanation:

Answer:

Chemical reaction involved is:

CaCO

3

→CaO+CO

2

Molar mass of CaCO

3

=40+12+16×3=100 g

According to the balanced reaction 100 g of CaCO

3

produces 1 mol of CO

2

i.e. 22.4 L at STP.

∴50 g CaCO

3

will produce

100

22.4

×50=11.2 L CO

2

at STP.

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Considering the reaction stoichiometry, from the balanced equation and reation stoichiometry, the number of moles of calcium  oxide produced is 1 mole.

Chemical reactions are characterized by the appearance of new substances from others. That is, they are processes in which the nature of the substances changes, that is, from some initial substances called reagents, totally different ones called products are obtained.

In this case, you know that the balanced reaction is:

CaCO₃ → CaO + CO₂

Stoichiometry establishes relationships between the molecules or elements that make up the reactants of a chemical equation with the products of said reaction. In other words, stoichiometry determines the ratios between reactants and products in a chemical reaction.

The stoichiometry of a chemical reaction is perfectly established by the chemical equation. In it, the formulas of reactants and products appear preceded by numbers (the stoichiometric coefficients) that indicate the proportions according to which the transformation occurs.

The stoichiometric coefficients of a chemical equation are due to the fact that the atoms present before the reaction must be the same after the reaction, even though the atoms will have been rearranged to produce new substances.

In this case, by reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:

In summary, from the balanced equation and reation stoichiometry, the number of moles of calcium  oxide produced is 1 mole.

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Answer:

I think it's replacement because the B and D just swap places in the end equation

Answer:

that would be replacment

Explanation:

if you look at the formula the B and D are replaced with each other

synthesis is when it looks like A+B--> AB

decompositions looks like AB--> A+B

and oxydation is when the states of atoms are changed so it would include things like +1, -1 etc

Answer: Matter takes up space and has mass

Explanation:

Literally the definition of mass

Answer:

3+(10G)=DG

ER_K5(O5G)+29K

Answer:

B

Explanation:

PE=m*delta(h)*g

So 0.75*1.5*9.8 equals PE

=11.025 so round up

Answer:

x = 63

z = 117

x + z = 180

Explanation:

edg 2020

Answer:

Explanation:

c

Answer:

Its can affect the safety of products by, for example, if you put raw chicken in the oven and don't cook it for long enough, it can make you sick

Explanation:

The difference between the calculated and precise worth is referred to as an error or defect. For example, if the two machinists use the same device to detect measurement mistakes, it is not necessary that they obtain the same results. However, there will be a little difference between the two measurements, which is referred to as an error.

They're made up of three main parts: protons, neutrons and electrons. Think of the protons and neutrons as together forming a “sun”, or nucleus, at the centre of the system. The electrons orbit this nucleus, like planets. If atoms are impossibly small, these subatomic particles are even more so.

Volume displaced by jewelry, V = 278 - 200 = 78 ml

Also, 1 ml = 1 cm³

We know, by water displacement method the volume of water displaced by an object it equals to its own volume.

So, volume of jewelry, V = 78 ml = 78 cm³.

Also, weight of jewelry is , w = 122 gm.

Now, we know density is given by :

[tex]d=\dfrac{w}{V}\\\\d=\dfrac{122\ gm}{78\ cm^3}\\\\d=1.56\ gm/ cm^3[/tex]

Hence, this is the required solution.

Answer:

a = 6 m/s².

Explanation:

If we have the object with mass of 75 kg and force on it is 50 N then according to given statement its acceleration is 3m/s².

When we double the force on same object by keeping the mass constant then the acceleration will also double. It means force will be 100 N and acceleration will be 6 m/s².

But if we we increase the mass then acceleration goes to decrease.

So,

mass = 75 kg

F = 50 N

a = 3m/s²  then by double the amount of force,

mass = 75 g

F = 100 n

a = 6 m/s².

This is actually explain the newton second law. This law stated that the acceleration of object is depend upon its mass and force acting on it.

F=  m. a

a = F/m

Thus acceleration is directly proportional to the force and inversely  proportional to the mass.

Answer:

Reactivity! :)

Explanation:

I just took the test! "2.13 Physical and Chemical Changes"

Reactivity is the chemical property of the substance. Therefore, option (C) is correct.

A chemical property can be described as the property that causes a change in the chemical structure of the substance. A chemical property of a substance can be seen in chemical change or reaction in the substance.

A chemical property represents the ability of a substance to combine with other substances or convert into a different product.  The chemical composition is the identity of the substance and on changing it the substance turns into a different substance.

A chemical property gets determined when a change occurs in the chemical identity of the substance. The chemical properties such as toxicity, reactivity, enthalpy of formation, the heat of combustion, oxidation states, radioactivity, etc.

The color, melting point, and boiling point are the physical properties of a substance while reactivity is the chemical property.

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Answer:

Look in the picture

Explanation: