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Triss [41]
3 years ago
13

A student mixes some water at room temperature with a white powder also at room temperature. The white powder disappears into th

e water, and bubbles form. The solution warms up to 30 ℃. Is this likely a physical or a chemical change? Explain your answer.
Chemistry
1 answer:
Leya [2.2K]3 years ago
5 0
Chemical change, because the white powder heated the water and caused a thermal reaction, and possibly gas was produced due to bubbles.
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PLZ HELP 30 PIONTSSSSS
Alborosie

Answer:

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6 0
3 years ago
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Calculate the energy required to heat of 1.50 kg silver from -7.8 C to 15.0 C . Assume the specific heat capacity of silver unde
Aloiza [94]

Answer:

804 J

Explanation:

Step 1: Given data

  • Mass of silver (m): 1.50 kg
  • Initial temperature: -7.8 °C
  • Final temperature: 15.0 °C
  • Specific heat capacity of silver (c): 0.0235J·g⁻¹K⁻¹

Step 2: Calculate the energy required (Q)

We will use the following expression.

Q = c × m × ΔT

Q = 0.0235J·g⁻¹K⁻¹ × (1.50 × 10³g) × [15.0°C-(-7.8°C)]

Q = 804 J

5 0
3 years ago
Calculate the frequency of a wave with a wavelength of 5.62 x 1010 m. (first convert m to nm)
Readme [11.4K]

Answer:

f = 0.534×10⁻² Hz

Explanation:

Given data:

Frequency of wave= ?

Wavelength of wave = 5.62×10¹⁰ m

Solution:

Formula:

Speed of wave = wavelength × frequency

Speed of wave = 3×10¹⁷ nm/s

λ  = 5.62×10¹⁰m×10⁹  nm/1 m = 5.62×10¹⁹ nm

Now we will put the values in formula.

3×10¹⁷ nm/s = 5.62×10¹⁹ nm ×  f

f = 3×10¹⁷ nm/s  / 5.62×10¹⁹ nm

f = 0.534×10⁻² s⁻¹   or

f = 0.534×10⁻² Hz

3 0
3 years ago
Which atoms has the same numbers of protons and neutrons​
Luda [366]

Explanation:

<em>Generally, the light nuclei atoms have the same number of protons and neutrons in the nuclear composition. They have a proton to neutrons ratio of almost or equal to 1 because in such a way the nucleus can achieve stability.</em>

<em>Generally, the light nuclei atoms have the same number of protons and neutrons in the nuclear composition. They have a proton to neutrons ratio of almost or equal to 1 because in such a way the nucleus can achieve stability.A lot of elements have the composition of protons and neutrons as same.</em>

<em>Generally, the light nuclei atoms have the same number of protons and neutrons in the nuclear composition. They have a proton to neutrons ratio of almost or equal to 1 because in such a way the nucleus can achieve stability.A lot of elements have the composition of protons and neutrons as same.Dueterium - 1 p and 1 n.</em>

<em>Generally, the light nuclei atoms have the same number of protons and neutrons in the nuclear composition. They have a proton to neutrons ratio of almost or equal to 1 because in such a way the nucleus can achieve stability.A lot of elements have the composition of protons and neutrons as same.Dueterium - 1 p and 1 n.Helium - 2 p and 2 n.</em>

<em>Generally, the light nuclei atoms have the same number of protons and neutrons in the nuclear composition. They have a proton to neutrons ratio of almost or equal to 1 because in such a way the nucleus can achieve stability.A lot of elements have the composition of protons and neutrons as same.Dueterium - 1 p and 1 n.Helium - 2 p and 2 n.Carbon - 6 p and 6 n.</em>

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5 0
3 years ago
1. A positive value for AH for a chemical reaction is an indication of which of the following?
goldenfox [79]
C is the correct answer
5 0
3 years ago
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