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3 years ago

Which of the following best describes alternating current? ________

Chemistry

2 answers:

Alenkasestr [34]3 years ago

7 0

B. Current in which charges change direction

Natali [406]3 years ago

3 0

B. A current in charges change direction

Explanation: an electric current that reverses its direction many times a second at regular intervals, typically used in power supplies.

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2) The fill-in statement, "In describing molecular compounds, the empirical

sweet [91]

I’m sure it’s c, I’m just trying to answer my first question, I’m pretty good at science, buh I’m yet to learn this

7 0

3 years ago

An element has an atomic number of 76. The number of protons and electrons in a neutral atom of the element are ____.

adell [148]

The mass of an atom comes from the protons and neutrons that are found in the nucleus. The number of protons is the atomic number of an element. To find the number of neutrons, subtract the atomic number from the mass of an atom. So, if an element is 76, the number of protons AND electrons is also 76.

8 0

4 years ago

Determine whether the material is a mineral or a non-mineral based on the description

almond37 [142]

Answer:

Calcium is homogeneous Three percent of Earth's crust is made of calcium Mineral
Glycerin is a viscous liquid at room temperature. Non-mineral
Emerald is hard and does not decay. Its chemical formula is Be3Al2(SIO3)6 Mineral
Chlorophyll is produced in plants during photosynthesis Non-mineral

Explanation:

Minerals are generally solid and inorganic substances, with defined crystalline structures, that exist in the earth's crust, formed by one or more chemical elements.

Calcium is the fifth element in abundance in the earth's crust, it is found forming mineral compounds such as calcite and dolomite or rocks such as marble, limestone and dolomite.

Glycerin is a colorless, slimy and sweet-tasting substance that is obtained from animal and vegetable fats and oils. According to its characteristics, it does not have a solid structure, which is why it is considered a non-mineral.

Emerald is a cyclic silicate of beryllium and aluminum whose chemical formula is Be3Al2(SiO3)6, it has a well-defined crystalline structure.

Chlorophyll is a green pigment that is present in the leaves and stems of many vegetables and is responsible for the photosynthesis process; does not have a crystalline structure defined by what is considered a non-mineral.

3 0

3 years ago

Read 2 more answers

PLEASE HELPP!!!!

Natasha_Volkova [10]

Answer:

The combined law is:

$\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}$

See the derivation below.

Explanation:

1. Boyle's law:

$PV=constant\\\\P_1V_1=P_2V_2$

2. Charles' law:

$\dfrac{V}{T}=constant\\\\\\\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}$

3. Gay-Lussac’s law

$\dfrac{P}{T}=constant\\\\\\\dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}$

4. Summary:

PV = K

V/T = K'

P/T = K''

Mulitply PV by V/T and P/T

$PV\times \dfrac{V}{T}\times \dfrac{P}{T}=K\times K'\times K''\\\\\\\dfrac{P^2V^2}{T^2}=constant\\\\\\\sqrt{\dfrac{P^2V^2}{T^2}}=\sqrt{constant}\\\\\\\dfrac{PV}{T}=constant$