2.92 x 10^-15/
(5.6 x 10^-3) (4.16 x 10^9)

Answer:

True? The don't stay exactly still i dont think, but i'd say true.

Explanation:

Answer:

TRUE

Explanation:

In a solid, atoms are packed tightly together and move very slowly. In fact, they do not flow at all: they simply vibrate back and forth.

Key words vibrate, not movement.

Correct me if I'm wrong of course

Answer:

None of the above

but it must be:

for Copper(I)chloride

3CuCl + Al ==> AlCl3 + 3Cu

for Copper (II) chloride

3CuCl2 + 2Al ==> 2AlCl3 + 3Cu

Answer:

Gallium

Explanation:

Answer:

Gallium

Explanation:

Answer:

a. 0.528 M .

Explanation:

Hello!

In this case, since the given by-mass percent can be written as:

[tex]\frac{10gCdSO_4}{100g\ sol}[/tex]

By using the density and molar mass of the solute, cadmium sulfate, we can compute the molarity, by also making sure we convert from mL to L of solution:

[tex]M=\frac{10gCdSO_4}{100g\ sol}*\frac{1molCdSO_4}{208.46gCdSO_4} *\frac{1.10g\ sol}{1mL\ sol}*\frac{1000mL}{1L} \\\\ M=0.528M[/tex]

Thereby, the answer is a. 0.528 M .

Best regards.

The molarity of the solution of 10% by mass cadmium sulfate [tex](CdSO_4)[/tex] is approximately 0.479 M. The correct option is C.

To calculate molarity we need to find out how many moles of CdSO4 are present in the solution.

Given:

We need to calculate the mass of [tex]CdSO_4[/tex]:

Mass of [tex]CdSO_4[/tex] = (10% / 100%) * Total mass of the solution

Mass of [tex]CdSO_4[/tex] = (10 / 100) * 1000 g (since the volume is 1 L, and the density is 1.10 g/mL)

Mass of [tex]CdSO_4[/tex] =  100 g

So, the number of moles of CdSO4:

Number of moles of [tex]CdSO_4[/tex] = Mass of CdSO4 / Molar mass of CdSO4

Number of moles of [tex]CdSO_4[/tex] = 100 g / 208.46 g/mol

Number of moles of [tex]CdSO_4[/tex] ≈ 0.479 moles

Then, we calculate the molarity of the solution:

Molarity = Number of moles of CdSO4 / Volume of the solution (in liters)

Molarity = 0.479 moles / 1 L

Molarity ≈ 0.479 M

Hence, the molarity of the solution of 10% by mass cadmium sulfate [tex](CdSO_4)[/tex] is approximately 0.479 M. The correct option is C.

Learn more about Molarity, here:

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Answer:Comparison of Ionic and Covalent Bonds

In an ionic bond, the atoms are bound together by the electrostatic forces in the attraction between ions of opposite charge. ... For example, sodium (Na), a metal, and chloride (Cl), a nonmetal, form an ionic bond to make NaCl. In a covalent bond, the atoms bond by sharing electrons.

pls   add  Brainliest

Answer:  Approximately [tex]0.267 \frac{\text{J}}{\text{g}^{\circ}\text{C}}[/tex]

===================================================

Work Shown:

We have the following variables

note: the symbol [tex]\Delta[/tex] is the uppercase Greek letter delta. It represents the difference or change in a value.

Apply those values into the formula below. Solve for c.

[tex]Q = m*c*\Delta t\\\\714 = 52*c*51.5\\\\714 = 52*51.5*c\\\\714 = 2678*c\\\\2678*c = 714\\\\c = \frac{714}{2678}\\\\c \approx 0.26661687826737\\\\c \approx 0.267\\\\[/tex]

The specific heat of the unknown metal is roughly [tex]0.267 \frac{\text{J}}{\text{g}^{\circ}\text{C}}[/tex]

Answer:

D.organism

Explanation:

A fungus from the kingdom fungi is an organism

Answer:

D. organism

......................

Answer:

Explanation:

From the combustion of carbon, the reactions occurring in limited oxygen conditions are:

[tex]C(graphite) + \dfrac{1}{2}O_{2(g)} \to CO_{(g)}[/tex]  

[tex]C(graphite) + O_{2(g)} \to CO_{2(g)}[/tex]  

If it occurs in excess, then any leftover CO changes to CO2. i.e.

[tex]C(graphite) + O_{2(g)} \to CO_{2(g)}[/tex]   ---- (1)

[tex]CO_{(g)} + \dfrac{1}{2}O_{(g)} \to CO_{2(g)}[/tex]          ----- (2)

From (1), the enthalpy change is:

[tex]\Delta H_{rxn1} = \Delta H^0_{fCO_2(g)} - ( \Delta H^0_{f C(graphite)}+ \Delta H^0_{fCO_2(g)}[/tex]

[tex]\Delta H_{rxn1} =-393.5 \ kJ/mol -(0+0)[/tex]

[tex]\Delta H_{rxn1} =-393.5 \ kJ/mol[/tex]

From (2), the enthalpy change is:

[tex]\Delta_{rxn2} = \Delta H^0_{fCO_2(g)} - ( \Delta H^0_{fCO(g)} + \dfrac{1}{2} \Delta H^0_{fO_2(g)})[/tex]

[tex]\Delta_{rxn2} = -393.5 \ kJ/mol -(-110.5 + \dfrac{1}{2}(0))[/tex]

[tex]\Delta_{rxn2} = -283.0 \ kJ/mol[/tex]

Subtracting (2) from (1), we get:

[tex]C(graphite) + O_{2(g)} \to CO_{2(g)} \ \ \ \Delta H_{rxn} = -393.5 \ kJ/mol}[/tex]

[tex]CO_{(g)} + \dfrac{1}{2} O_2(g) \to CO_{2(g)}} \ \ \ \Delta H _{rxn2} = -283.0 \ kJ/mol[/tex]

[tex]C(graphite) + O_{2(g)} \to CO (g) + \dfrac{1}{2}O_{2(g)} \ \ \ \Delta H_{rxn} = -110.5 \ kJ/mol[/tex]

[tex]C(graphite) + \dfrac{1}{2} O_{2(g)} \to CO (g) \ \ \ \Delta H_{rxn} = -110.5 \ kJ/mol[/tex]

The enthalpy change ΔH of the reaction = -110.5 kJ/mol

Answer:

i just took it the answers is C

Explanation:

Mercury(II) oxide, a red solid, decomposes when heated to produce mercury and oxygen gas. Mercury(II) oxide is a red solid. When it is heated, it decomposes into mercury metal and oxygen gas. A reaction is also considered to be a decomposition reaction even when one or more of the products are still compounds.

Answer:

Fluorine

Explanation:

These particles stick in the atoms and make them radioactive.

Answer:

density =mass/volume

Explanation:

p=m/v

p means raw

m means mass

v means volume.

Answer:

0.0344 moles and 1.93g.

Explanation:

Molarity is defined as the ratio between moles of a solute (In this case, KOH), and the volume. With molarity and volume we can solve the moles of solute. With moles of solute we can find mass of the solute as follows:

Moles KOH:

15.2mL = 0.0152L * (2.26mol / L) = 0.0344moles

Mass KOH:

0.0344 moles * (56.11g/mol) = 1.93g of KOH

Answer:

C₃H₈O₃

Explanation:

Let's assume we have 100 g of said compound. Then we would have:

Now we convert those masses into moles, using their respective atomic weights:

Then we divide those moles by the smallest number among them:

Finally we multiply those numbers by 3, so as to convert the 2.68 of H into an integer:

Thus the empirical formula is C₃H₈O₃

Answer:

529g/L

Explanation:

The concentration in chemistry is defined as the amount of solute in a determined amount of solution. The concentration in g/L means the amount of grams of solute (In this case, barium acetate), per liter of solution.

To solve this problem we need to find grams of solute (52.9g, already given) and the volume in liters (Converting 100mL to liters):

Volume:

100mL * (1L / 1000mL) = 0.100L

And concentration in g/L is:

52.9g / 0.100L =

Answer:

2

Explanation:

because first shell ( k shell ) needs only 2 electron to complete its octet .

hope it helps

The answer is A. The vibration caused by the waves through the air eventually weaken, which is why sound diminishes easily over distance.

Answer:

False

Explanation:

Answer:

Physical and chemical changes can occur almost everywhere, even in our bodies! Food must be broken down into a form that our cells can use. When we eat, our bodies physically break down food into small pieces. Our bodies also chemically break down those small pieces of food into tiny organic molecules.

Explanation:

Answer:

5.44 moles of nitrogen required.

Explanation:

Given data:

Number of moles of NH₃ = 10.88 mol

Moles of N₂ required = ?

Solution:

Chemical equation:

N₂ +  3H₂         →       2NH₃

Now we will compare the moles nitrogen and hydrogen.

               NH₃          :           N₂

                 2             :           1

               10.88        :         1/2×10.88 = 5.44mol

5.44 moles of nitrogen required.

Answer:

120.37 g/mol is the molar mass of magnesium sulfate

Answer:

im pretty sure its the last one

Explanation:

if plants dont have sun light they will die because the sunlight gives them the nutrients to survive

Answer:

. A(n) _______________________________ is matter that is composed of 2 or more different kinds of atoms.

2. A chemical reaction in which energy is released/given off is _____________________________________.

3. A(n) _________________________________ is a process in which substances are changed into other

substances.

4. Matter that is composed of only 1 kind of atom is a(n) ______________________________.

5. ___________________ is the ability to do work and/or transfer heat.

6. A chemical reaction in which energy is absorbed/taken in is _______________________________.

Knew/New

Write down 3 things you already knew about chemical reactions that were confirmed through watching the

video:

1.

2.

3.

Write down 3 new things that you learned from watching the video:

1.

2.

3.

Episode Guide

1. Chemicals can react to form new _________________________________.

2. Chemical reactions happen when ____________________ hook together.

3. Energy is given off during a chemical reaction because ____________________ are combining with other

__________________________.

4. During the "Try this" experiment, we see the students using vinegar and salt to clean old copper pennies.

The copper gets stripped away and the pennies look new again. Explain why you think this happens.

__________________________________________________________________________________________

Answer Key

compound

exothermic

chemical reaction

element

Energy

endothermic

Answers will vary.

Answers will vary.

chemicals

electrons

electrons

electrons

Copper atoms in the penny react with oxygen atoms from the air & together they form copper oxide which

makes the pennies look dull and dirty. The copper oxide dissolves in a weak acid (the vinegar & salt).

5. When vinegar and baking soda react together, the new substance that is produced is ___________________.

6. _______________ & ______________ are both dangerous by themselves, but when they react together they

form table salt.

7. Pyrotechnician is a name given to people who work to create _________________________.

8. In another experiment, we see kids blow up a balloon by mixing together vinegar and baking soda. When

the kids touch the blown up balloon, it is ____________ to the touch. This means that the reaction is

endothermic or exothermic

9. When someone gets hurt playing sports, often times a cold pack is used for the injury. The cold pack takes

up more energy than it gives off and it gets very ___________ to the touch. This means that the reaction taking

place is endothermic or exothermic

10. How do you know baking a cake is a chemical reaction? ________________________________________

11. There are ___________ naturally occurring elements.

12. If elements are in the same group on the periodic table, what does that tell you? ______________________

__________________________________________________________________________________________

True or False

1. When something burns, heat & light are given off. T or F

2. Your stomach growling is an example of a chemical reaction. T or F

3. Water is 1 part hydrogen and 2 parts oxygen. T or F

4. When baking a cake, a chemical reaction takes place. T or F

5. Everything is made of chemicals. T or F

6. Alfred Nobel invented dynamite. T or F

7. You should always wear safety goggles when working with chemicals. T or F

8. Sodium chloride is better known as sugar. T or F

9. A substance can feel a little warm if the reaction is endothermic. T or F

10. When developing film, red light doesn't affect the picture. T or F

11. A cold pack gets cold because the reaction takes more energy than it gives off. T or F

12. If chemicals behave similarly, they are grouped together on the periodic table. T or F

13. Chemical reactions happen when protons link atoms together. T or F

14. When vinegar and baking soda react, oxygen is produced. T or F

15. Fireworks are not an example of chemical reactions. T or F

carbon dioxide

Sodium chlorine

fireworks

warm

cold

The ingredients (flour, milk, eggs, etc.) are changed

Explanation:

Answer:

Environmental factors such as diet, temperature, oxygen levels, humidity, light cycles

And the presence of mutagens can all impact which of an animal's genes are expressed, which ultimately affects the animal's phenotype.