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2 years ago

Question 9 of 10

Chemistry

2 answers:

DanielleElmas [232]2 years ago

8 0

Answer:

its d, forming a hypothesis is always one of the first things you do, and d is the best answer from these 4

Ira Lisetskai [31]2 years ago

3 0

Answer:

D. A scientist should form a hypothesis, then conduct an experiment

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Are all forms of energy as useful to us or can we only use certain forms at home, in our cars, or computers?

tatiyna

All forces of energy are useful at home, like friction, friction can let us grip to the ground, or mechanical energy, used in cars because cars move, and computers same thing you move the mouse, type and do way more. Energy is always around us.

5 0

3 years ago

Electromagnetic radiation emitted from a hot object reaches it's peak at a wavelength of 8.5 x 10-7 m. What is the frequency of

liubo4ka [24]

Answer:

the frequency is 18

Explanation:

please mark me as the branlest hope it helps please

3 0

3 years ago

Read 2 more answers

Boron compare to potassium

Mademuasel [1]

Answer:

What are Boron and Potassium?

Boron is a chemical element with the symbol B and atomic number 5. Produced entirely by cosmic ray spallation and supernovae and not by stellar nucleosynthesis, it is a low-abundance element in the Solar System and in the Earth's crust. It constitutes about 0.001 percent by weight of Earth's crust while potassium is a chemical element with the symbol K and atomic number 19. Potassium is a silvery-white metal that is soft enough to be cut with a knife with little force. Potassium metal reacts rapidly with atmospheric oxygen to form flaky white potassium peroxide in only seconds of exposure.

What are boron and potassium used for?

Boron is a mineral that is found in food and the environment. People take boron supplements as medicine. Boron is used for building strong bones, treating osteoarthritis, as an aid for building muscles and increasing testosterone levels, and for improving thinking skills and muscle coordination while Potassium is a mineral that plays many important roles in the body. Food sources of potassium include fruits (especially dried fruits), cereals, beans, milk, and vegetables. Potassium is most commonly used for treating and preventing low potassium levels, treating high blood pressure, and preventing stroke.

4 0

3 years ago

1.) The property by the virtue of which the metals can be beaten into sheets.

Dafna1 [17]

Answer:

1.) The property by the virtue of which the metals can be beaten into sheets.

Malleability

Click it while asking question it allow u to paste image.

6 0

3 years ago

Hydrogen gas can be prepared by reaction of zinc metal with aqueous HCl:

kow [346]

Answer:

The volume of hydrogen gas generated by given reaction is 9.48 L

Explanation:

Firstly, we calculate the mole of Zinc added, n = 25.5 / 65 = 0.392 mol

With the same equivalent, the mole of generated hydrogen gas will be the same, at 0.392 mol.

Secondly, we get the equation

P . V = n . R . T

with P (pressure, atm), V (volume, litre), n (mole, mol), R (ideal gas constant, 0.082), T (temperature, Kelvin)

So we have to convert the given information to correct unit

P = 742 mmHg = 0.976 atm

T = 15 °C = 288 K

Hence we can calculate the generated volume by

V = n . R . T / P = 0.392 x 0.082 x 288 / 0.976 = 9.48 L

3 0

3 years ago