Someone plz help me :(

Answer:

+27 66 514 3800

Explanation:

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Answer:

407.5 g

Explanation:

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Answer:  3.156 grams

Explanation:  The additional volume is 4 ml.  (0.789 g/ml)*(4 ml) = 3.156 grams

Answer:5600 years

Explanation:

the amount of time it takes for the quantity to lose 50% (Half life) of its value. The half-life of carbon-14 is about 5600 years. Thus, after 5600 years, a piece of cotton cloth will contain half the carbon-14 that was in the original cotton plant.

Answer:The below file contains the answer

Explanation:

Answer:

Explanation:

water

H. 2. O is the chemical formula for water, meaning that each of its molecules contains one oxygen and two hydrogen atoms

Answer:

Yes, it is correct.

Explanation:

400 cm = 4 m

40 m = 40 m

0.4 km = 400m

Therefore, 400 cm < 40 m < 0.4 km

Answer:

Explanation:

400 centimeter....... smallest

0.4 kilometer .............. middlest

40 meter..................... greatest

Answer:  Heterogeneous Catalyst

Explanation:  The word heterogeneous means "different phases" or insoluble in science.  

Answer: B. Compare the similarities of the climate in Ireland with the climate in Greenland.

We should Compare the similarities of the climate in Ireland with the climate in Greenland.

Answer:

the answer is the number of gas molecules changes.

Answer:

freezing

Explanation:

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Answer:

freezing. b.

Explanation:

Answer: theo mình thì mình làm như sau

cu(no3)2 nhiệt phân hết

\Rightarrow nNO2= 0,02mol

nO2=0,005mol

khi hấp thụ O2 và NO2 vào nước ta có

2NO2 + 1/2 O2\Rightarrow 2HNO3

phản ứng là vừa đủ nên

nHNo3= 0,02 mol

pH HNO3=2

khi cho 0,001mol NaOH vào thì phản ứng trung hòa

H+ + OH- \Rightarrow H20

nHNO3=0,02/20=0,001

nhận thấy nH+ =nOH- nên phản ứng vừa đủ

pH của dd Y=7

theo mình giải là như vậy

Explanation:

Answer:

Mass/Volume

Explanation:

Answer:

[tex]{ \sf{density = \frac{mass}{volume} }}[/tex]

Answer:

0.162 mol

Explanation:

n=m/M

M= 20*3 + 15*2 + 8*4*2

M=154 g/mol

n=25g/154g/mol

n=0.162 mol

The number of moles in 25 grams of calcium phosphate is 0.162 mol.

Mole is a SI unit that is used to measure the quantity of any substance in a specific amount. To calculate the moles, we will divide the mass of the substance by the molar mass of that substance.

n = m/M

Calcium phosphate is a chemical compound that contains calcium and phosphorus or phosphoric acid, and it is used to treat the low calcium in the body and thyroid and parathyroid.

The molar mass of calcium sulfate is 154 g/mol

The mass of calcium sulfate is 25 grams

Putting the value in the equation

n = m/M

n = 25g / 154 g/mol = 0.162 mol

Thus, the moles of calcium sulfate are 0.162 mol.

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Answer:

It is 0.05 moles of water

Explanation:

From avogadro's number:

[tex]{ \sf{6.02 \times {10}^{23} \: mole cules= 1 \: mole }} \\ { \sf{3 \times {10}^{22} \: molecules = ( \frac{3 \times {10}^{22} }{6.02 \times {10}^{23} }) \: moles }} \\ \\ { \sf{ = 0.05 \: moles}}[/tex]

Answer:

[tex]\boxed {\boxed {\sf 0.05 \ mol \ H_2O}}[/tex]

Explanation:

We are asked to calculate the number of moles of water, given the molecules of water.

We will convert moles to molecules using Avogadro's Number or 6.022 × 10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. In this case, the particles are molecules of water or H₂O.

We will convert using dimensional analysis, so we must set up a ratio using Avogadro's Number.

[tex]\frac {6.022 \times 10^{23} \ molecules \ H_2O} { 1 \ mol \ H_2O}[/tex]

We are converting 3 × 10²² molecules of water to moles, so we must multiply the ratio by this value.

[tex]3 \times 10^{22} \ molecules \ H_2O*\frac {6.022 \times 10^{23} \ molecules \ H_2O} { 1 \ mol \ H_2O}[/tex]

Flip the ratio so the units of molecules of water cancel.

[tex]3 \times 10^{22} \ molecules \ H_2O*\frac{ 1 \ mol \ H_2O} {6.022 \times 10^{23} \ molecules \ H_2O}[/tex]

[tex]3 \times 10^{22} *\frac{ 1 \ mol \ H_2O} {6.022 \times 10^{23}}[/tex]

[tex]\frac {3 \times 10^{22}} {6.022 \times 10^{23}} \ mol \ H_2O[/tex]

[tex]0.04981733643 \ mol \ H_2O[/tex]

The original value of molecules of water ( 3 × 10²² ) has 1 significant figure, so our answer must have the same number of sig figs. For our answer that is the hundredth place. The 9 in the thousandth place tells us to round the 4 in the hundredth place up to a 5.

[tex]0.05 \ mol \ H_2O[/tex]

3×10²² molecules of water are equal to 0.05 moles of water.

Answer:

In his 1805 work, "A New System of Chemical Philosophy," Dalton propounded the tenets of his atomic theory: The chemical elements are made of atoms. The atoms of an element are identical in mass. Atoms of different elements have different masses.

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Answer:

1. The graph is showing the monthly rainfall between April to July.

2. The month is on the X axis.

3. The inches of the monthly rainfall is on the Y axis.

Answer:

Energy . ......

Hope this helps you!

When conducting research, scientists use the scientific method to collect measurable, empirical evidence in an experiment related to a hypothesis (often in the form of an if/then statement), the results aiming to support or contradict a theory.

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Answer:

the elements are listed in order of increasing atomic number. The atomic number is the number of protons in the nucleus of an atom.In a periodic table arranged in order of increasing atomic number, elements having similar chemical properties naturally line up in the same column.

The elements on the periodic table are arranged on the basis of highlighting similarities between elements. Thus, the correct option for this question is A.

The elements on the periodic table are basically arranged on the basis of increasing their atomic number. These atomic number is represented by the number of protons in the nucleus of an element.

According to the question, the elements possessing identical chemical properties are arranged in the same group. For example, group 17 is known as the halogen group. Among this group, the elements bear one electron short to fulfill their octet.

The whole periodic table comprises of 18 groups and 7 periods.

Therefore, the elements on the periodic table are arranged on the basis of highlighting similarities between elements. Thus, the correct option for this question is A.

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Answer:  Exothermic

Explanation:  The energy of the reactants is leass than that of the products.  Conservation of energy means that the excess is given off, or exothermic.

Explanation:

oxygen (O)will react with water(H2O) to form hydroxide which is (OH

Answer:

Answer is in the attachment

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Answer:

Explanation:

It is a colorless liquid. It reacts with water to give adipic acid. It is prepared by treatment of adipic acid with thionyl chloride.

Adipoyl Chloride can be used in the synthesis of nylon. Also it is used in the synthesis of chiral polymer for membrane application.

Answer:

For the distance range 50 to 500 km, the S-waves travel about 3.45 km/s and the P-waves around 8 km/s.

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Answer:

For the distance range 50 to 500 km, the S-waves travel about 3.45 km/s and the P-waves around 8 km/s.

Answer:

D

Explanation:

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Producing hydrogen gas. Hence, option D is correct.

Electrolysis is described by two half-reactions. These half reaction are the oxidation half-reaction and reduction half-reaction.

Electrolysis involves the transfer of electrons. Each half reaction is characterized by the loss or gain of electrons.

The only reason why producing hydrogen gas is not used most of the time is because electrolysis has very low efficiency, most of the energy finishes up being converted to heat and 95% of the hydrogen is produced by steam reforming.

Hence, option D is correct.

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Answer: Rubber source, temperature, thinkness, thread design, driving pattenrs, weather, etc.

Explanation: There are many variables. Here are a few I would include in a tire lifetime study:

1. Type of rubber, including source

2. Thickness of tire

3. Design of tire thread

4. Life as a function of average speed and road surface

5. Expected outside temperature and wet conditions

6. Driving conditions of speed and both acceleration and deceleration parameters (e.g., tire life when slamming on the brakes or accelerating quickly)