13. A sample of copper has a volume of 14.75 cm3. The density of copper is 8.96 g/cm3. What is the mass of this sample?

Answer:

JUST B

Explanation:

Answer:

Explanation:

The standard system of measurement is what is popularly referred to as SI unit (or international system of units). For example, the SI unit for length is basically in meters (m), which is convertible to millimeter (mm), centimeter (cm) or even kilometer (km).

If there is no standard system of measurement,

1) Scientists will not be able to compare data as every scientist will use a unit that suits him/herself which might make data incomparable as some units might be difficult to convert to other units or there conversion methods might even be debatable.

2) There might be a general lack of understanding of the research work done by a scientist/scientists in the scientific community. This is because the standard system of measurement affords scientists to communicate properly with the same or convertible units and based on 1. above, if scientists use any unit that isn't agreed upon, different/unknown/debatable units might make understanding of research works incomprehensible.

Answer:

see below

Explanation:

A. (1.8 X 10^20) X (2.5 X 10^16)

= 4.5 x 10³⁶

B.(7.9 X 10^9) - (6.0 X 10^8)

= 7.3 x 10⁹

C. (9.2 X 10^19) ÷ (3.0 X 10^7)

= 3.067 x 10¹²

D. (4.2 X 10^9) + (8.0 X 10^18)​

= 8.00000002042 x 10¹⁸

Answer:

see below

Explanation:

A. (1.8 X 10^20) X (2.5 X 10^16)   = 4.5 x 10^36

B.(7.9 X 10^9) - (6.0 X 10^8)  = 7.3 x 10^9

C. (9.2 X 10^19) ÷ (3.0 X 10^7)  = 3.067 x 10^12

D. (4.2 X 10^9) + (8.0 X 10^18)​  = 8.0 x 10^18

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{Density} [/tex]

From the question

mass of Iron = 1500 g

Density = 5.5 g/mL

Substitute the values into the above formula and solve

That's

[tex]volume = \frac{1500}{5.5} \\ = 272.727272...[/tex]

We have the final answer as

Hope this helps you

Answer:

Independent variable - Piece of bread

Dependant variable - Moistness of brownie

Constants- Same size and location of brownie

Hypothesis - IF a piece of bread is added to a brownie container, THEN the brownie will be moister

Control groups- The set of brownie containers she adds no piece of bread to

Experimental group- The set of brownie containers she adds a piece of bread to

Explanation:

The hypothesis in an experiment is a testable explanation to a given problem, which is whether a piece of bread can make brownie moist in this question. Hence, a possible hypothesis will be: IF a piece of bread is added to a brownie container, THEN the brownie will be moister

Independent variable is the variable that the experimenter changes or manipulates in the experiment. In this case, the independent variable is the PIECE OF BREAD added to the brownie.

The dependent variable is the variable that is being measured in an experiment. The dependent variable in this case is the MOISTNESS of the brownie

Constants are variables that the experimenter keeps unchanged for all the groups throughout the experiment. In this case, the constants are SAME SIZE AND LOCATION OF BROWNIE.

Control group is the group that does not receive the experimental treatment or independent variable while the experimental group is the group that receives the experimental treatment. The control group in this experiment is: The set of brownie containers she adds no piece of bread to, while the experimental group is the: The set of brownie containers she adds a piece of bread to

Answer:

0.010

Explanation:

Significant Figures Rules:

1. Anything that isn't a zero is a sig fig

2. If a decimal point comes after the ones digit, everything before the decimal is counted as sig fig (i.e 2000. would be 4 sig figs).

3. If we are dealing with small decimals, the zero before and after the decimal (i.e 0.002) is a placeholder and is not counted as sig figs.

4. Any zeros between 2 significant digits is considered in sig figs (i.e 2002 would be 4 sig figs)

5. Any zeros after a significant digit in a decimal (i.e 0.020) is considered a sig fig

0.0102 would be 3 sig figs. Rounding to the thousandths place of 0.010 would be 2 sig figs.

Answer:

Al(NO3)3(s)--------> Al^3+(aq) + 3NO3^-(aq)

Explanation:

The equation shown above describes the dissolution of Al(NO3)3 in water using the lowest coefficients.

This occurs when solid Al(NO3)3 is added to water. It dissolves to give rise to ions as shown. This is a property of all ionic substances.

Answer:

D on edge

Explanation:

just took test

The list of elements in order from most conductive to least conductive is; potassium (K), germanium (Ge), selenium (Se).

Conductivity is a property of metals. The more "metallic" an element is, the greater its conductivity.

The most metallic element in the list is Potassium hence it has the highest conductivity (1.4×107 S/m) followed by germanium which is a semiconductor (2000 S/m). Selenium has the least electrical conductivity.

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Explanation:

To solve that deadlock problem, in 1913 Bo kept Rizopho's model of planetary atom and combined with Plang quantum theory, he produced a hydrogen atom model with the following three determinations: - In atoms, The clectron cannot orbit any other, but only rotates with a certain number of orbits. Each "allowed" orbit is equivalent to a certain energy. - When rotating in "allowed" orbits, electrons do not lose energy, meaning they do not emit radiation, but emit radiation only when the electron jumps from an orbit with the high energy level in the orbit corresponding to the the low energy and the household energy of radiation are equal to the difference of the two energy levels. - - When rotating in those "allowed" orbits, the electron has a momentum moment that is an integer times of h / (2π).

Answer:

C+O2=CO2

Explanation:

During combustion the reaction is formed.

Answer: is C

Explanation:

Both the atomic mass and the atomic number increase from left to right

Answer:

The answer is number 3

Explanation:

Psychology is considered a science because it uses a systematic method of asking and answering questions true or false

It's true

Answer:

1.5217391304348 gram/cubic centimeter is the density

3.5 gram/2.3 cubic centimeter

The density of the container is 1.52gms/cm.

Three of a fundamental properties of certain objects are basically mass, volume, and density.

Mass characterizes how heavy the material is, volume defines its size, and density is referred to as mass divided by volume. Despite the fact that mass and volume are everyday concepts.

One of an object's most important and easily measured physical properties is its density.

Densities are commonly used to identify pure substances as well as to characterize and estimate the composition of various types of mixtures.

Density is an important concept because it determines which substances will float and which will sink.

Substances float in general if their density is less than the density of the liquid in which they are placed.

Given that,

Mass = 3.5gm.

Volume = 2.3 cm.

Density = ?

We know that,

Density = mass/volume.

Density = 3.5/2.3

Density = 1.52gms/cm.

Thus, the density for the given data is 1.52gms/cm.

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Answer:

21 g/mL

Explanation:

To solve this problem, first look at the density equation, which is D=M/V, which D stands for density, M stands for mass, and V stands for volume. When you substitute in the variables, you get D=17.5/.82, which is equivalent to 21.34. However, since we need to pay attention to the sig fig rules for multiplying, we need to have the same amount of sig figs as the value with the least amount of sig figs, which is the number .82. .82 has two sig figs, so you round down. Your answer will be 21 g/mL.

Answer:

6078

Explanation:

Answer:

Antoine Laurent Lavoisier

Answer:

The correct option is (d).

Explanation:

It is given that,

1$ = 1500 pesos

We need to convert 360 pesos into dimes

We can convert 360 pesos to dollars as follows:

[tex]360\ \text{pesos}=\$\dfrac{1}{1500}\times 360\\\\=$0.24[/tex]

360 pesos is equal to $0.24

Also, 1 dollar = 10 dimes

We can covert 0.24 dollar to dimes as follows :

0.24 dollar = 10 × 0.24 dimes

0.24 dollar = 2.4 dimes

or

360 pesos = 2.4 dimes

Answer:

Explanation:

in the Lewis structure of ICl4- there are total of 36 valence electrons. Since Iodine (I) is below Period 3 on the periodic table it can hold more than 8 electrons. ... Also note that you should put the ICl4- Lewis structure in brackets with as 1- on the outside to show that it is an ion with a negative one charge.

The formal charge present on the iodine atom of ICl₄ is -1.

Formal charge on any atom present in any compound will be calculated by using the below formula:

Formal Charge = (No. of valence electrons in neutral atom) - 1/2 (No. of electrons in covalent bond) - (No. of electrons in lone pair)

In the structure of ICl₄, 4 covalent bonds are present and for iodine atom no. of valence electrons in iodine is 7 and lone pair present on iodine is 2 means 4 electrons of lone pair is present. Structure is shown in the attached image.

On putting these values we get,

Formal charge = 7 - 1/2(8) - 4 = -1

Hence in iodine atom -1 charge is present.

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Answer:

Yes

Explanation:

: The corrosion of iron indicates a chemical change in the metal. ... Where salt is present, electrochemical corrosion occurs, and the protective oxide film does not form, thus the corrosion (buildup of rust) continues unchecked. Your iron nail will indeed rust more quickly and severely in salt water.

Answer:

For comprehension, the question is written properly with options attached below:

plasma that has particles that never collide frequently enough to exchange kinetic energy and never reach a temperature equal to the surroundings is categorized as:

A. a thermal plasma.

B. ionized plasma.

C. low density plasma

D. nonthermal plasma.

The correct answer to the question above is "Option D (nonthermal plasma.)"

Explanation:

Plasma, for example radiant sun are state of matter made up of atoms where the ions move freely, there are composed of photons and free electrons but the positive and negative ions are equal creating a swirling gas of positive ions and negative electron and they are also good conductors of electricity as their charged particles move.

Unlike thermal plasmas that ensure their temperature is equal to their surroundings, non-thermal plasma, is not in equilibrium with its surrounding., in other words, non-thermal plasma never reaches temperature that is equal to their surroundings. They can be formed by electrifying electromagnetic waves.

A plasma with particles that never collide frequently to exchange kinetic energy is : ( D ) Nonthermal plasma

A plasma is a body of matter made up photons and  freely moving ions contained its atoms the free moving ions are both positive and negative ions which are equal to each other.

A Thermal plasma collide frequently enough to reach a temperature that is equal to the temperature of the surroundings while Nonthermal plasma does not collide enough and does not reach an equilibrium temperature with its surrounding.

Hence we can conclude that A plasma with particles that never collide to exchange kinetic energy is A Nonthermal plasma.

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Answer:

the volume of a set of keys is 6.75ml

Answer:

by throwing away or recycle

Explanation:

Answer:

mineral

Explanation:

Because every natural thing has mineral

Answer:

704 meters

Explanation:

1 Kilometer = 1000 meters

0.704 km * 100m/ 1 km = 704 m