How many significant figures are in 31400

Answer:

10

Explanation:

a centimeter and a milimeter differ from each other by a factor of 10

Answer: 10

Explanation:

Answer:

The most important use of hydrocarbons is for fuel. Gasoline, natural gas, fuel oil, diesel fuel, jet fuel, coal, kerosene, and propane are just some of the commonly used hydrocarbon fuels. Hydrocarbons are also used to make things, including plastics and synthetic fabrics such as polyester.

Answer:

Lithium

Explanation:

Using the periodic table, the selection of the element that best fits the following descriptions is lithium. The correct option is D.

A periodic table is a table that contains chemical elements in it. It is a tabular structure that displays elements according to their characteristics. It is used in chemistry and physics.

Lithium is an element that is present in the first row of the periodic table. The first row is called the alkali metals. Its atomic number is 3, and it is white and silvery.

Alkali metals are called alkali because they form alkalies reacting with water. Like lithium hydroxide. They are very strong bases. They are very reactive.

Thus, the correct option is D. lithium.

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Answer:

693000

Explanation:

Multiplying anything by 10 must follow the base 10 system rules.

That means we can simply move the decimal 5 places to the right.

6.93 x 10⁵ = 693000

My answer to the question is 693000.

Answer:

It is important to note that iron, cobalt, and nickel which appear in period 4, of the transition metals, next to each other, share very similar physical and chemical properties and are known collectively as the iron triad

The comparison of the properties of iron includes

Chemical properties

1) Atomic number; The atomic number of iron is 26 while the atomic number of nickel is 28

2) The oxidation states of iron are 2, 3, 6 while the oxidation state of nickel are 2,3

3) The ionization energies in kJ/mol  are first 759, second 1561, and third 2957 for iron and first 737, second 1753, and third 3393 for nickel

Physical properties

1) The mass of iron is 55.85 with density = 7.87 g/cm³, the mass of nickel is 58.69 with density = 8.91 g/cm³

2) The melting point of iron is 1530°C, boiling point 2862°C and that of nickel are 1455°C and 2732°C

3) The electrical conductivity of iron is 16 and that of nickel is 23

Explanation:

Answer:

The mass of a sample of iron that has had 300 J applied to it and heats up from 20 degrees Celsius to 40 degrees Celsius is 32.61 grams.

Explanation:

Calorimetry is the measurement and calculation of the measurement of heat changes exchanged by a body or a system produced in physical and chemical processes.

The sensible heat of a body is the amount of heat received or transferred by a body to produce a change in temperature but without a change in physical state.

The sensible heat in a constant pressure is calculated by:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c, and where ΔT is the temperature variation (ΔT=Tfinal - Tinitial)

In this case:

Replacing:

300 J= 0.46 [tex]\frac{J}{g*C}[/tex] * m* (40 - 20) C

Solving:

300 J= 0.46 [tex]\frac{J}{g*C}[/tex] * m* 20 C

[tex]m=\frac{300 J}{0.46 \frac{J}{g*C} * 20 C}[/tex]

m= 32.61 g

Answer:

D. Mass

Explanation:

Answer:

D

Explanation:

The number of neutrons in an atom affects the atomic mass number or atomic weight.

Answer: A and D

Explanation: Miles and Kilometers are the best units when measuring distances between cities, this is because both units will in most cases give a reasonable representation of the distance being measured by giving an output which isn't too large or extremely small. Feets and inches are usually adopted when measuring length of objects which in most cases are small and average only a few meters. Meters are also used for measuring short and medium distances. However, representing distances between two cities in terms of inches or feets will usually give extremely large values. Hence, the need for a fairly larger unit in miles or kilometers.

Answer:

1.      0.00040 calories

2.   8.57 calories

3.   0.196 calories

4.  68 calories

5. 243 calories

6.  83680 joules

7.  1,054,368 joules

8. 2.45 calories

9. 556 (it says calories to calories so it wouldn't change)

10. 28367.52 joules

11. 59.6 calories

12. 449.6 joules

13.  0.00234 calories

14. 23292.328 joules

15. 22877693.6 joules

Hope this helps!

Explanation:

Answer:

5.26g

Explanation:

Please see attached picture for full solution.

Answer:

8.9168 is the answer..

Answer:

The correct option is;

C. Two in the first energy level, six in the second energy level

Explanation:

The electrons in an atom are arrange in orbital shells which are situated at different levels within the structure of the, depending on the energy of the electron. Electrons with the least amount of energy are found in the shell closest to the nucleus of the atom which is the first energy level

The maximum number of electrons that can be found in a given an energy level is obtained with the following formula;

The number of electron = 2 × n²

Where;

n = The number of the different energy level

Therefore;

The maximum number of electrons in the first energy where n = 1 is given as follows;

The number of electron = 2 × 1² = 2 electrons

The maximum number of electrons in the second energy level where n = 2 is given as follows;

The number of electron = 2 × 2² = 8 electrons

Given that there are only 8 electrons in the atom, we therefore have, 2 electrons in the first energy level and the remaining 8 - 2 = 6 electrons in the second energy level.

Answer:

158g

Explanation:

To calculate the "weight" (mass) of ethyl alcohol, we have to use this formula:

- Density will have units of gmL when dealing with a liquid or units of gcm3 when dealing with a solid.

The mass has units of grams, g.

The volume will have units of mL or cm3

We are given the density and volume, both of which have good units so all we have to do is rearrange the equation to solve for the mass:

density×volume=massvolume×volume

Density×Volume = Mass

0.789gmL×200.0mL

Thus, ethyl alcohol weighs 158g.

Answer:

Water molecules pull the sodium and chloride ions apart

Explanation:

Answer:

0.05 Liter

Explanation:

Conversion factor: 1/1000

1) Liter = Cubic Centimeter / 1000

2) Liter = 50 / 1000

3) Liter = 0.05

Answer:

8.6g/cm³ (BRASS)

Explanation:

Given the following :

Mass of object = 86g

Volume of object = 10cm³

The density of an object is calculated using the formula :

Density(g/cm³) = mass(g) / volume(cm³)

Inputting our values :

Density = 86g / 10cm³

Density = 8.6g/cm³

According to the table provided, the object which corresponds to having a density of 8.6g/cm³ is BRASS

1. The density of the material is 8.6 g/cm³.  

2. The material is brass

Density is simply defined as the mass per unit volume of a substance i.e

The density of the material can be obtained as shown below

Mass = 86 g

Volume = 10 cm³

Density = mass / volume

Density = 86 / 10

Therefore, the density of the material is 8.6 g/cm³

From the calculation made above, the density of the material is 8.6 g/cm³.

Comparing the density of the material (i.e 8.6 g/cm³) with those

given in the table from the question, we can conclude that the

material is brass.

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Answer:

An organ would have more kinds of specialized cells because it is made up of different tissues.

Answer:

The atomic number

Answer:

C)  66 calories

Explanation:

The Heat energy required to flow into a unit mass object to raise its temperature by 1 degree is known as specific heat capacity.

specific heat capacity of aluminum, c = 0.22 cal/g°C

mass of aluminium, m = 20.0 g  

Answer:

far apart

Explanation:

The molecules of any gaseous compounds are loosely bound and the molecules are far apart from each other. They move freely and rapidly. The inter-molecular forces are lower as compared to a solid or a liquid where the molecules are comparatively closely bound in the compounds.  

Because of the large gap or distance between its molecules, gaseous compounds have less density  when compared to any solid or liquid.

Answer:

B

Explanation:

Because a ball falling down is a good strong force

Correct Answer:

A ball hitting a bat

Answer:

- sunlight heats the earth's surface

- climate change by trapping heat in the ozone layer

- increased wild fires

- food shortages due to higher temperatures

- they contribute to respitory disease due to smog and air pollution

(lol i'll be your friend)

Answer:

yes

Explanation:

it change everything

im pretty sure the awnser is yes

Answer:

Kingdom, phylum, class, order, family, genus, and species

Explanation:

Kingdom, phylum, class, order, family, genus, and species are the list used to classify organisms on the basis of similarities and differences. The largest group of classification is kingdom while the smallest group is the species. In each category, the  organisms which are present are similar to each other while different from one another in some characteristics.

Answer:

a) 67000 b) 0.20 c) 52.8010 d) 3.17000

Explanation:

your welcome :)

a) 67000 b) 0.20 c) 52.8010 d) 3.17000 are the answers respectively.

Distance is a physical quantity which is measured in meter. If a man travel then it is measured in meters that defines that how much he travel from one point to another point for all these type of things we use to measure distance.

Centimeter is also a physical quantity which is use to measure distance. 1 centimeter is equal to 0.01 meter and 1 centimeter is equal to 0.00001 kilometer.the kilometer is large quantity to measure distance while centimeter is smaller quantity to measure distance.

Kilometer is also a physical quantity which use to measure the distance 1 kilometer is equal to 1000 mtr and 1 kilometer is equal to 100000 centimeter.

For above conclusion, we easily states that the kilometer is large quantity to measure distance while centimeter is smaller quantity to measure distance. Centimeter is also a physical quantity which is use to measure distance. 1 centimeter is equal to 0.01 meter and 1 centimeter is equal to 0.00001 kilometer.

Therefore, a) 67000 b) 0.20 c) 52.8010 d) 3.17000 are the answers respectively.

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Answer:

Ecosystem

Explanation:

I got the answer from the Mcgrawhill textbooks.

Answer and Explanation:

In Chemistry, the quantity or amount of a pure substance is given by:

Inter-conversion of units is allowed based on defined units and constituent of the substance.

I believe this explanation would be helpful and easy to follow.

The carbon element  combines chemically with oxygen and hydrogen to form a compound known as sugar. When making syrup, the sugar is dissolved in water to make a mixture . Before the sugar and water are mixed, the heterogenous  mixture is not the same sweetness throughout. After mixing, the solution homogenous is because when sugar is evenly disbursed throughout the water. Finally, the water is slowly boiled off and the solution slowly becomes sticky and gooey because the viscosity has increased and the solution now resists flowing.

A solution is a homogeneous mixture of two or more substances. A solution may exist in any phase. A solution consists of a solute and a solvent.

For the solutions, with components in the same phase, the substances present in lower concentration are solutes, while the substance present in higher concentration is the solvent.

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