Juan noticed that a door that sticks on hot days does not stick when it cools off at night. This is because the metal contracts as it cools. The reason for this is that, as the metal cools, the atoms:become smaller and take up less space .

slow down and move closer together.

merge together to form fewer atoms.

speed up and move further apart.

Answers

Answer 1

Answer: The atoms in the metal slow down and move closer together. So the answer is B.

Related Questions

Hydrazine, N2H4, is a weak base and is used as fuel in the space shuttle.N2H4(aq)+H2O(l)âN2H5+(aq)+OHâ(aq)Part AIf the pH of a 0.133 M solution is 10.66, what is the ionization constant of the base?Express your answer using two significant figures.
How many grams of acetic acid are needed to react with 55.5 g of salicylic acid?
Which statements about freshwater sources are true? Check all that apply.Only about 3 percent of Earth's water is fresh water.Most of the fresh water on Earth is groundwater.About 75 percent of the fresh water on Earth is frozen in ice sheets.The largest source of usable fresh water is groundwater.More fresh water is in the atmosphere than in rivers and lakes.
Write the reaction of ammonia and water. Label the acid, base, conjugate acid and conjugate base.Is Ammonia a weak or strong base?
What is planck's theory?

The value of the Solubility Product Constant for lead phosphate is ____________Write the reaction that corresponds to this Ksp value.

_______(Aq,S,L) +_______(Aq,S,L) <-------->_______(Aq,S,L) +_______(Aq,S,L)

Ksp values are found by clicking on the "Tables" link.

Use the pull-down menus to specify the state of each reactant or product.

If a box is not needed leave it blank.

Answers

Answer: The reaction for the $K_(sp)$ value of lead phosphate is given below and the value of solubility product for the same is $3.0\rightarrow 10^(-44)$

Explanation:

Solubility product is defined as the product of concentration of ions present in a solution each raised to the power its stoichiometric ratio. It is expressed as $K_(sp)$

The chemical formula of lead phosphate is $Pb_3(PO_4)_2$

The equation for the hydration of the lead phosphate is given as:

$Pb_3(PO_4)_2(s)+H_2O(l)\rightarrow 3Pb^(2+)(aq.)+2PO_4^(3-)(aq.)$

The solubility product of lead phosphate is $3.0\rightarrow 10^(-44)$ . This means that it is highly insoluble in water as the solubility product is very very low.

Hence, the reaction for the $K_(sp)$ value of lead phosphate is given above and the value of solubility product for the same is $3.0\rightarrow 10^(-44)$

The distance from Earth to the Moon is approximately 240.000 mi Part C The speed of light is 3.00 x 10 m/s How long does it take for light to travel from Earth to the Moon and back again? Express your answer using two significant figures.

Answers

Answer:

2.6 sec

Explanation:

The distance between the Earth and the moon = 240,000 miles

Also,

1 mile = 1609.34 m

So,

Distance between the Earth and the moon = 240,000 × 1609.34 m = 386241600 m

Speed of the light = 3 × 10⁸ m/s

Distance = Speed × Time.

So,

Time = Distance / Speed = 386241600 m / 3 × 10⁸ m/s = 1.3 sec

For back journey = 1.3 sec

So, total time = 2.6 sec

An observation that deals with numbers is a(n)A. Prediction

B. Quantitive observation

C. Evaluation

D. Qualitative observation

Answers

Answer:

B (Quantitative)

Explanation:

a clever way to remember the difference between quantitative and qualitative is that there is a nin quantitative which is the first letter to the word number.So quantitative is an oberservation with numbers

the answer is b like maggie said

When an electron moves up to higher energy levels, the atom Choose... a photon of light whereas the atom Choose... a photon of light when an electron drops to a lower energy level. The photons emitted from an atom appear as

Answers

Answer:

Explanation:

When an electron moves from a lower energy level to a higher energy level, energy is absorbed by the atom. When an electron moves from a higher to a lower energy level, energy is released and photon is emitted.

this emitted photon is depicted as a small wave-packet being expelled by the atom in a well-defined direction.

Express the equilibrium constant for the combustion of propane in the balanced chemical equation c3h8(g)+5o2(g)???3co2(g)+4h2o(g)

Answers

according to the balanced equation:
C3H8(g) + 5O2(g) ↔ 3CO2(g) + 4 H2O (g)
aA + bB ↔ cC + dD

according to K formula when:
K = concentration of the products / concentration of the reactants

K = [C]^c[D]^d / [A]^a[B]^b
when [A],[B],[C]and[D] is the concentrations
and a,b,c and d is the no of moles
∴ K = [CO2]^3[H2O]^4 / [C3H8] [ O2]^5

Answer:

combustion reaction

Explanation:

there is oxides in the equation c3h8(g)+5o2(g)3co2(g)+4h2o(g)

What is the final step in the scientific method

Answers

Conclusion

Hope this helps!

Once a hypothesis has been formed, it must be tested. This is done by conducting a carefully designed and controlled experiment. The experiment is one of the most important steps in the scientific method, as it is used to prove a hypothesis right or wrong, and to formulate scientific theories.

Other Questions

Boyd takes additional measurements of the mass of product formed in a reaction. He uses a balance that has smaller graduations than the first balance he used. What is Boyd most likely trying to change?He is trying to increase his accuracy but not his precision.He is trying to increase his precision but not his accuracy.He is trying to decrease his precision and increase his accuracy.He is trying to increase his precision and decrease his accuracy.apparently not He is trying to increase his accuracy but not his precision.

A student is heating a chemical in a beaker with a Bunsen burner.In a paragraph of at least 150 words, identify the safety equipment that should be used and the purpose of it for the given scenario.

At a winter carnival, a balloon is filled with 5.00 L of helium at a temperature of 1.0°C. What will be the volume of the balloon when it is brought into a warm house at 24°C?

14) Describe the Cloud Model.