Can someone tell me the answer plz plz I’ll give you brainlist and points plz This is my final test No wrong answers

Answer:

107.8

Explanation:

64 gram of N2H4 produce 72 gram of H20

then by crossmultiplication

64*121.3/72=107.82

Answer:

5

Explanation:

Protons are depicted in this picture as +, and the no. of protons are always equal to the no. of electrons (unless it's an ion).

Over here, there are 5 protons therefore there should also be 5 electrons.

Explanation:

Gravitational potential energy

= mgh

= (5kg)(9.81N/kg)(150m)

= 7357.5J.

Answer:

[tex]\boxed {\boxed {\sf 7350 \ Joules}}[/tex]

Explanation:

Gravitational potential energy can be found using the following formula:

[tex]E_P=m*g*h[/tex]

Where m is the mass, g is the gravitational acceleration, and h is the height.

The mass of the object is 5 kilograms. On Earth, the acceleration due to gravity is 9.8 meters per square second. The height is 150 meters.

[tex]m= 5 \ kg \\g= 9.8 \ m/s^2 \\h= 150 \ m[/tex]

Substitute the values into the formula.

[tex]E_p=(5 \ kg)(9.8 \ m/s^2)(150 \ m)[/tex]

Multiply the first two numbers.

[tex]E_P=(49 \ kg*m/s^2)(150 \ m)[/tex]

[tex]E_p=(49 \ N)(150 \ m)[/tex]

Multiply.

[tex]E_p=7350 \ N*m[/tex]

[tex]E_p= 7350 \ J[/tex]

The gravitational potential energy of the object is 7350 Joules

1.1 × 10²² atoms Au

Chemistry

Atomic Structure

Math

Pre-Algebra

Order of Operations: BPEMDAS

Step 1: Define

3.7 g Au

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of Au - 196.97 g/mol

Step 3: Convert

[tex]3.7 \ g \ Au(\frac{1 \ mol \ Au}{196.97 \ g \ Au} )(\frac{6.022 \cdot 10^{23} \ atoms \ Au}{1 \ mol \ Au} )[/tex] = 1.13121 × 10²² atoms Au

Step 4: Check

We are given 2 sig figs. Follow sig fig rules and round.

1.13121 × 10²² atoms Au ≈ 1.1 × 10²² atoms Au

Answer:

Physical properties

Atomic mass: 55.845

Density: 7.87 g/cm3

Group: Transition metals

Electrons: [Ar] 3d6 4s2

Melting point: 1811 K

Boiling point: 3134 K

Discovered: Ancient times

Explanation:

hope this helps! :D

Answer:

Pd (palladium).

Explanation:

46 electrons total, this is representative of the Pd (palladium) element.

Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Palladium (Pd) element is represented by the ground state electronic configuration.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.

The ground state electronic configuration of 1s² 2s² 2p⁶3s² 3p⁶4s² 3d¹⁰ 4p⁶ 5s² 4d⁸ shows total 46 electrons. The element with atomic number 46 is palladium, Pd. Palladium is a d block element. Palladium is found in group 8 and period four of periodic table.

Therefore, palladium (Pd) element is represented by the ground state electronic configuration.

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Answer:

D 4P +3O₂ → 2 P₂O₃

Explanation:

In this problem, we need to convert the mass of phosphorus and oxygen to moles trying to find the ratio of reaction (The moles of P that reacts per mole of O₂):

Moles P:

12.4g P * (1mol P / 31g) = 0.4 moles

Moles O₂:

9.6g * (1mol / 32g) = 0.3 moles

The ratio of reaction is:

0.4 mol / 0.3 mol = 1.33 = 4 moles of P / 3 moles of O₂

That means 4 moles of P react with 3 moles of O₂ and the reaction that represents this ratio is:

The reaction of 12.4 g Phosphorous with 9.6 grams of Oxygen will be represented as [tex]\rm 4\;P\;+\;3\;O_2\;\rightarrow\;2\;P_2O_3[/tex]

In a chemical equation, the stoichiometric values are the moles of the molecules involved in the reaction. For the reaction of Phosphorous and oxygen, the moles of both elements are to be calculated.

Moles = [tex]\rm \frac{weight}{molecular\;weight}[/tex]

Moles of Phosphorous = [tex]\rm \frac{12.4}{31}[/tex]

Moles of Phosphorous = 0.4

Moles of oxygen = [tex]\rm \frac{9.6}{16}[/tex]

Moles of oxygen = 0.6

Moles of [tex]\rm O_2[/tex] = 0.3

The equation will be:

[tex]\rm 0.4\;P\;+\;0.3\;O_2\;\rightarrow\;2\;P_2O_3[/tex]

[tex]\rm 4\;P\;+\;3\;O_2\;\rightarrow\;2\;P_2O_3[/tex]

The correct reaction will be D.

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Answer:

121.37 moles

Explanation:

I'm not sure

Answer:

1.21 x 10^2

Explanation:

Answer:

Periodic tables can use color to identify other element characteristics. For example, an electronegativity periodic table color codes the elements based on how electronegative they are. The valence periodic table uses color to identify the most common valence state for each element.Oct 2, 2019

pls like and rate us .

The color given to a the elements in periodic table is to characteristics of the elements mainly to identify whether they are solid, gas or liquid. Thus option D is correct.

A periodic table contains all the discovered elements which are classified into different groups and periods. Groups are vertical columns of elements with similar properties and same number of valence electrons.

Periods are horizontal rows from left to right with an increase in atomic number. There are 18 groups and 7 periods in periodic table. Each group has given each color and some elements showing exceptional characteristics such as hydrogen and helium have separate colors.

All the first group elements called alkali metals have one color and the second groups elements with another color, All the d-block elements are given the same colour and metals in p-block elements have the same color.

Similarly, all the metalloids have one color and all other gases have the same colour in which inert gas group and halogen group have seperate colours.

Hence, the color in periodic table helps to identify the element's nature like its state also. Thus option D is correct.

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Answer:

Combination or synthesis

Explanation:

The given reaction is:

            6Li +  N₂ → 2 Li₃N

This reaction is a synthesis or combination reaction. 6 moles of Li combines with nitrogen gas to produce 2 moles of  Li₃N.

Answer:

A

Explanation:

A salad with lettuce, cheese, seeds, tomatoes, broccoli, and other vegetables is an example of a heterogeneous mixture.

Milk is not mixed with anything so that is incorrect

River water is mixed in with dirt and minerals so this one is incorrect

Beach sand is incorrect because you can see colored particles.

Answer:

Explanation:

Weight

A measure of the force of gravity on an object

Mass

The measurement of how much matter an object contains

Volume

The amount of space that matter occupies

Density

The physical property that relates the mass and volume of an object or material

Unlike weight, mass doesn't change with location, even when the force of gravity on an object changes

Why do scientists prefer to describe its matter by its mass rather than its weight?

International System of Units

What system of units do scientists use to measure the properties of matter?

Liter, milliliter, cubic centimeter

3 common units of volume

Volume= length•width•height

Volume formula

Sand and feathers have different densities

Why does a kg of sand take up much less space than a kg of feathers?

Density=mass/volume

Density formula

Objects with densities greater than water will sink and objects with densities less than water will float. The density of wood is less than water (1 g/cm3) and the density of iron is greater than water (1 g/cm3)

If you drop a block of iron and block of wood into water, the iron sinks and the wood floats. What can you conclude about the density of iron and wood compared to the density of water?

V=2,400 cm3

A box has a length of 25 cm, a width of 8 cm, and a height of 12 cm. What is its volume?

D= 13.5 g/cm3

A sample of metal has a mass of 94.5 g and a volume of 7 cm3. What is its density?

Mass= density•volume

Mass formula

M= 234.26 g

Corn oil has a density of 6.89 g/cm3. What is the mass of 34.0 cm3 of corn oil?

Yes. No. The pull of gravity is different on the moon.

A solid has a mass of 180. Would the solid have a mass of 180 g on the moon? Would it have the same weight on Earth as on the moon? Explain.

No, because only the mass and volume will change

Will every solid with the same dimensions have the same density?

Grams and kilograms

Common units for mass

Grams per cubic centimeter or grams per cubic milliliter

Common units for density

V= 20 ml

D= 0.75 g/cm3

George put 25 ml of water into a graduated cylinder. After adding a solid object, the water level in the cylinder rose to 45 ml. What is the volume of the object? The object George is examining has a mass of 15 grams. What is the density of the object?

Answer:

A reaction in which two or more reactants combine to form only one product is called a synthesis reaction.

Explanation:

Answer:

X 154

Check solution in explanation

Explanation:

Average atomic mass = ( mass 1× abudance) + ( mass 2× abudance)+ ( mass 3× abudance) / 100

(149×13.8)+(152×44.9) +(154×41.3)/100

2056.2 + 6824.8 + 6360.2/100

=152.412

Ammonium chromate

May I get brainliest if its right? ;-;

Answer:

unbalanced moving to the right is the awnser

Answer:

unbalanced moving to the right i think

Explanation:

Answer:

See the attached notation!

Answer:

An ideal gas is a gas with particular characteristics.

Explanation:

Ideal gases are hypothetical which means that they do not exist in their true form.

hope this helps, pls mark brainliest :D

Answer:

covalent bond

Explanation:

Answer:

I can help and what are you confused about? pls hurry my lunch break will be over

Explanation:

Answer:

The resultant structure is shown below. This structure contains four shared pairs of electrons, which are located on all four "sides" of carbon's electron dot structure. Each of these shared pairs was created by pairing one of carbon's unpaired electrons with an unpaired electron from chlorine.

Explanation:

Answer:

She should bend her hips so her head is closer to the handlebars.

Answer:

the answer is A did it on edge

Explanation:

Answer:

97.561 g/mol

Explanation:

Answer:

BY NAMING THE MINERALS :>

Explanation:

Answer:

NAMING THE MINERALS

Explanation:

Answer:

4

Explanation:

i think

Skeletal structure is missing, so i have attached it.

Answer:

Option B: Omega 6 fatty acid

Explanation:

Arachidonic Acid is defined as an essential and unsaturated fatty acid. It's usually found in animal and human fat including the liver, brain, and also glandular organs. While in animals, it is a constituent of their phosphatides.

Arachidonic Acid is formed as a result of the synthesis from dietary linoleic acid and it's a preliminary stage in the biosynthesis of prostaglandins, thromboxanes, and leukotrienes.

In short, Arachidonic acid is basically a long-chain fatty acid which is a C20, Omega 6 polyunsaturated fatty acid that has four Z-double bonds.

Answer:

At standard temperature and pressure, hydrogen is a colorless, odorless, and tasteless gas. Hydrogen is very flammable and burns with an invisible flame. It burns when it comes into contact with oxygen. The byproduct of a hydrogen and oxygen explosion is water or H2 O.